CN105738807B - A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system - Google Patents
A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system Download PDFInfo
- Publication number
- CN105738807B CN105738807B CN201610080920.8A CN201610080920A CN105738807B CN 105738807 B CN105738807 B CN 105738807B CN 201610080920 A CN201610080920 A CN 201610080920A CN 105738807 B CN105738807 B CN 105738807B
- Authority
- CN
- China
- Prior art keywords
- unit
- phase
- voltage
- square wave
- touchdown
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
A kind of high speed dynamic pressure gyro machine of the present invention contacts to earth rotary speed test system, is related to electromechanical testing field, comprising：Motor control unit, sensor unit, high-speed data acquisition unit, central processing unit, voltage comparison unit, signal condition unit, communication unit, host computer data analysis solving unit, the display of test result and storage unit etc., can accurately measurement motor contact to earth rotating speed and detection kinetic pressure air-float bearing of inner characteristic, and further obtain every state characteristic index of hydrodynamic bearing, the present invention uses back-emf mensuration, it can be with measurement motor in float, gyroscope instrument, characterisitic parameter under the states such as inertial platform, electric current can only be measured after dress table by efficiently solving gyro machine, voltage and the problem of other characterisitic parameters cannot be measured.This measuring system can assess the operating status of gyro machine in real time, and to enhancing gyroscope instrument product reliability, improving dynamic pressure motor product quality and precision has highly important engineering significance.
Description
Technical Field
The invention relates to the field of motor testing, in particular to a touchdown rotating speed testing system of a high-speed dynamic pressure gyro motor.
Background
The dynamic pressure gyro motor is a high-speed running motor using dynamic pressure air bearing as supporting structure, and is applied to gyroscope and inertial platform because of its long service life, ultra-low vibration, low noise, strong overload resistance and small rotation speed fluctuation. At present, the method for measuring the characteristic parameters of the dynamic pressure gyro motor is to measure the mechanical characteristics of the dynamic pressure gyro motor by matching a power meter with a reaction torque tester in a motor state. However, when the dynamic pressure motor is installed in a gyro instrument or installed on an inertia platform, the quality of the motor body and the dynamic pressure bearing can be indirectly judged only by collecting the voltage and the current of the gyro motor, but the most critical moment parameter of the air bearing of the motor cannot be measured, so that the direct quantitative evaluation of the air bearing is not formed from the installation of the gyro motor in the instrument and the platform to the final springing-up use.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a touchdown rotating speed testing system of a high-speed dynamic pressure gyro motor, is used for testing the high-speed permanent magnet and hysteresis dynamic pressure gyro motor, and solves the problem that the gyro motor cannot quantitatively evaluate the state of an air bearing from the time of being installed in an instrument and a platform to the time of final springing-up use.
The above purpose of the invention is realized by the following technical scheme:
a touchdown rotating speed testing system of a high-speed dynamic pressure gyro motor comprises a motor control unit, a voltage sensor unit, a three-phase voltage acquisition unit, a voltage comparison unit, a signal conditioning unit, a filtering unit, a high-speed data acquisition unit, a central processing unit, a communication unit, an upper computer data analysis and calculation unit and a test result display and storage unit;
a motor control unit: receiving a control signal transmitted by the central processing unit, and controlling the starting and stopping of an external gyro motor;
a voltage sensor unit: testing three-phase back electromotive force of an external gyro motor after power failure to generate a three-phase voltage signal, and transmitting the three-phase voltage signal to a three-phase voltage acquisition unit;
three-phase voltage acquisition unit: collecting three-phase voltage signals transmitted by a voltage sensor unit, and transmitting the three-phase voltage signals to a voltage comparison unit;
a voltage comparison unit: receiving a three-phase voltage signal transmitted by a three-phase voltage acquisition unit, and comparing the three-phase voltage signal with a standard voltage; when the voltage amplitude is larger than 12V, the three-phase voltage signals are output to the signal conditioning unit; when the voltage amplitude is 1.25V-12V, the three-phase voltage signals are output to the signal conditioning unit; when the voltage amplitude is 0-1.25V, transmitting the three-phase voltage signals to a filtering unit;
a signal conditioning unit: receiving a three-phase voltage signal with a voltage amplitude larger than 12V transmitted by the voltage comparison unit, carrying out voltage reduction processing, adjusting the voltage to be within 1.25V-12V, carrying out square wave conversion to generate a three-phase standard square wave voltage signal, and transmitting the three-phase standard square wave voltage signal to the filtering unit; receiving three-phase voltage signals with the voltage amplitude of 1.25-12V transmitted by the voltage comparison unit, performing square wave conversion to generate three-phase standard square wave voltage signals, and transmitting the three-phase standard square wave voltage signals to the filtering unit; receiving the boosted three-phase voltage signals transmitted by the filtering unit, performing square wave conversion on the three-phase voltage signals to convert the three-phase voltage signals into three-phase standard square wave voltage signals, and transmitting the three-phase standard square wave voltage signals to the filtering unit;
a filtering unit: receiving a 0-1.25V three-phase voltage signal transmitted by the voltage comparison unit, adjusting the three-phase voltage signal to be within 1.25V-12V after filtering and boosting, and outputting the boosted three-phase voltage signal to the signal conditioning unit; receiving a three-phase standard square wave voltage signal transmitted by the signal conditioning unit, and directly outputting the three-phase standard square wave voltage signal to the high-speed data acquisition unit; or the three-phase standard square wave voltage signal is generated into a three-phase synchronous square wave voltage signal and then is transmitted to the high-speed data acquisition unit;
a high-speed data acquisition unit: receiving a three-phase standard square wave voltage signal or a three-phase synchronous square wave voltage signal transmitted by a filtering unit; counting for 1 time when the square wave voltage signal meets a zero crossing point, calculating a counting result j =1,2,3 \ 8230, wherein \ 8230, q and q are positive integers, and transmitting the counting result to a central processing unit;
a central processing unit: firstly, sending a gyro motor starting signal to a motor control unit, and after the motor control unit controls an external gyro motor to reach a synchronous rotating speed, sending a power-off control signal by a central processing unit and transmitting the power-off control signal to the motor control unit; synchronously receiving the counting result transmitted by the high-speed data acquisition unit, storing the counting result, and calculating a back electromotive force half period Tj; tj is the counting result multiplied by the inherent trigger time of the crystal oscillator of the counter, and the counting result and the back electromotive force half cycle Tj are transmitted to an upper computer data analysis and calculation unit through a communication unit;
a communication unit: receiving the counting result and the back electromotive force half period T transmitted from the central processing unit j And the counting result and the back electromotive force half period T are compared j The data are transmitted to an upper computer data analysis and calculation unit;
the upper computer data analysis and calculation unit: receiving the counting result and the back electromotive force half period T transmitted by the communication unit j (ii) a Calculating to obtain inertial running time, touchdown rotating speed and touchdown resisting moment parameters; the inertial running time, the touchdown rotating speed and the touchdown resisting moment are transmitted to a test result display and storage unit;
the test result display and storage unit: receiving inertial running time, touchdown rotating speed and touchdown resisting moment transmitted by an upper computer data resolving analysis unit; displaying and storing real-time numerical values of the rotating speed in the testing process; and the parameters of the touchdown resistance moment, the touchdown time, the touchdown rotating speed and the touchdown resistance moment are displayed on a test result interface after the test is finished.
In the above system for testing the touchdown rotation speed of the high-speed dynamic pressure gyro motor, in the filtering unit, when the amplitude of the three-phase standard square wave voltage signal is not within the set filtering voltage range, the filtering unit directly outputs the three-phase standard square wave voltage signal to the high-speed data acquisition unit; when the amplitude of the three-phase standard square wave voltage signal is within the filtering voltage range, the filtering unit carries out filtering and differential amplification processing on the three-phase standard square wave voltage signal, noise filtering is carried out on the three-phase standard square wave voltage signal with the voltage amplitude within the preset voltage range, the voltage amplitude is amplified by 10 times, the frequency is kept synchronous, a three-phase synchronous square wave voltage signal is generated, and the three-phase synchronous square wave voltage signal is transmitted to the high-speed data acquisition unit.
In the touchdown rotating speed testing system of the high-speed dynamic pressure gyro motor, the set filter voltage range is-1- +1v; the preset voltage range is as follows: -1.25V- +1.25V.
In the above mentioned ground-contacting rotation speed testing system of the high-speed dynamic pressure gyro motor, the inertial running time, the ground-contacting rotation speed and the ground-contacting resistance moment parameter calculation method are as follows:
coasting time T:
the unit s;
wherein, T j Counter electromotive force half cycle T for the process from motor power-off to rotor stalling j The unit is s; q is all half cycles of the three-phase counter potential signal in the process from the power-off of the motor to the stop of the rotor, namely a counting result;
change value delta T of adjacent half period in power-off inertia running process j Comprises the following steps:
ΔT j ＝T j -T j-1 j =1,2,3, \8230 \ 8230q, unit s;
time to ground T c : the time from the power failure of the external gyro motor to the touchdown of the external gyro motor, wherein c is the half-cycle number of voltage at the touchdown time, and c is a positive integer, and the gyro motor is determined to be touchdown when q = c;
the unit s;
and (3) judging the ground contact rotating speed: the value of change Δ T of adjacent half-cycles c If the value is larger than the empirical set value delta, the value of c can be solved;
ΔT c ＝|T c -T c-1 |&δ, unit s;
real-time rotation speed n:
n＝60/p(T j +T j-1 ) Unit rpm;
ground contact rotating speed n c ：
n c ＝60/p(T c +T c-1 ) Unit rpm;
fluctuation of rotational speed Δ ω j ：
ω j ＝π/T j ；Δω j ＝π/T j -π/T j-1
Wherein p is the number of pole pairs of the motor;
ω j the unit is rad/s for the rotation angular velocity of the motor;
△ω j is the rotation angular velocity variation with unit of rad/s;
rotational resistance moment M: the sum of resisting moment borne by an external gyro motor in the process of stalling after power failure;
ground contact resistance moment M c : is T c Rotational resistance moment at touchdown time;
wherein J is the rotary inertia of the external gyro motor rotor; delta omega c The unit of the variation of the rotation angular speed of the gyro motor at the moment of touchdown is rad/s.
In the touchdown rotating speed testing system of the high-speed dynamic pressure gyro motor, in the signal conditioning unit, a programmable gain instrument amplifier and a fully differential funnel attenuation amplifier are cascaded to provide high differential input impedance and-110 dB total harmonic distortion, the amplitude of a counter electromotive force signal is adjusted to be within a tested effective range of-12 to +12V, and meanwhile, a counter electromotive force three-phase sine wave signal is converted into a square wave signal.
In the above mentioned system for testing the touchdown rotation speed of the high-speed dynamic pressure gyro motor, the filtering unit is an anti-aliasing filter.
Compared with the prior art, the invention has the following advantages:
(1) The invention adopts a counter electromotive force measuring method to extract an effective half period signal T from a three-phase counter electromotive force signal j Realizes that the external gyro motor is arranged on the floater and the gyroThe method comprises the steps of measuring characteristic parameters such as touchdown resistance moment, touchdown time, touchdown rotating speed, inertial running time and the like under the states of a screw instrument, an inertial platform and the like, and effectively solving the problem that no direct quantitative evaluation method is formed on an air bearing when a gyro motor is used from the time of being installed in the instrument and the platform to the time of final springing;
(2) The invention adopts the upper computer data analysis and calculation unit and adopts a formula The inertial running time of the gyro motor in different states is measured; by the formula Δ T c ＝|T c -T c-1 |>, delta, change value delta T when adjacent half period c When the contact rotation speed is larger than the empirical set value delta, the contact rotation speed of the gyro motor in different states is measured; by the formula n =60/p (T) j +T j-1 ) Real-time rotating speed measurement of the gyro motor in different states is realized; by the formulaThe measuring curve of the spinning resistance moment M of the gyro motor in the process of stalling after power failure is realized;
(3) According to the invention, the filtering unit adopts an anti-aliasing filter to limit the bandwidth of the signal and the noise provided for the input end of the ADC, so that the unnecessary aliasing effect is prevented, and the signal-to-noise ratio of the back electromotive force signal at the later stage of the inertial rotation of the gyro motor is improved;
(4) The signal conditioning unit of the invention cascades the programmable gain instrument amplifier and the fully differential funnel attenuation amplifier to provide high differential input impedance and-110 dB total harmonic distortion.
Drawings
FIG. 1 is a schematic block diagram of a touchdown rotation speed testing system of a high-speed dynamic pressure gyro motor according to the present invention;
fig. 2 is a diagram illustrating the principle of waveform conversion by the back emf method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in fig. 1, the schematic block diagram of a touchdown and rotation speed testing system of a high-speed dynamic-pressure gyro motor is shown, and the schematic block diagram of the touchdown and rotation speed testing system comprises a motor control unit, a voltage sensor unit, a three-phase voltage acquisition unit, a voltage comparison unit, a signal conditioning unit, a filtering unit, a high-speed data acquisition unit, a central processing unit, a communication unit, an upper computer data analysis and calculation unit and a test result display and storage unit;
a motor control unit: receiving a control signal transmitted by the central processing unit, and controlling the starting and stopping of an external gyro motor;
a voltage sensor unit: testing three-phase back electromotive force of an external gyro motor after power failure to generate a three-phase voltage signal, and transmitting the three-phase voltage signal to a three-phase voltage acquisition unit;
three-phase voltage acquisition unit: collecting three-phase voltage signals transmitted by a voltage sensor unit, and transmitting the three-phase voltage signals to a voltage comparison unit;
a voltage comparison unit: receiving a three-phase voltage signal transmitted by a three-phase voltage acquisition unit, and comparing the three-phase voltage signal with a standard voltage; when the voltage amplitude is larger than 12V, the three-phase voltage signals are output to the signal conditioning unit; when the voltage amplitude is 1.25V-12V, the three-phase voltage signals are output to the signal conditioning unit; when the voltage amplitude is 0-1.25V, the three-phase voltage signals are transmitted to the filtering unit;
a signal conditioning unit: the programmable gain instrument amplifier is cascaded with a fully differential funnel attenuation amplifier to provide high differential input impedance and-110 dB total harmonic distortion, the amplitude of a back electromotive force signal is adjusted to be in a tested effective range of-12 to +12V, and simultaneously a back electromotive force three-phase sine wave signal is converted into a square wave signal; receiving a three-phase voltage signal with a voltage amplitude larger than 12V transmitted by the voltage comparison unit, performing voltage reduction processing, adjusting the voltage to be within 1.25V-12V, performing square wave conversion to generate a three-phase standard square wave voltage signal, and transmitting the three-phase standard square wave voltage signal to the filtering unit; receiving three-phase voltage signals with the voltage amplitude of 1.25-12V transmitted by the voltage comparison unit, performing square wave conversion to generate three-phase standard square wave voltage signals, and transmitting the three-phase standard square wave voltage signals to the filtering unit; receiving the boosted three-phase voltage signals transmitted by the filtering unit, performing square wave conversion on the three-phase voltage signals to convert the three-phase voltage signals into three-phase standard square wave voltage signals, and transmitting the three-phase standard square wave voltage signals to the filtering unit;
a filtering unit: is an anti-aliasing filter; receiving the 0-1.25V three-phase voltage signal transmitted by the voltage comparison unit, adjusting the voltage signal to 1.25V-12V after filtering and boosting, and outputting the boosted three-phase voltage signal to the signal conditioning unit; receiving a three-phase standard square wave voltage signal transmitted by the signal conditioning unit, and directly outputting the three-phase standard square wave voltage signal to the high-speed data acquisition unit; or the three-phase standard square wave voltage signal is generated into a three-phase synchronous square wave voltage signal and then is transmitted to the high-speed data acquisition unit;
when the amplitude of the three-phase standard square wave voltage signal is not in the set filtering voltage range, the filtering unit directly outputs the three-phase standard square wave voltage signal to the high-speed data acquisition unit; when the amplitude of the three-phase standard square wave voltage signal is within the filtering voltage range, the filtering unit carries out filtering and differential amplification processing on the three-phase standard square wave voltage signal, noise filtering is carried out on the three-phase standard square wave voltage signal with the voltage amplitude within a preset voltage range, the voltage amplitude is amplified by 10 times, the frequency is kept synchronous, a three-phase synchronous square wave voltage signal is generated, and the three-phase synchronous square wave voltage signal is transmitted to the high-speed data acquisition unit;
wherein the set filter voltage range is-1- +1v; the preset voltage range is as follows: -1.25V- +1.25V.
A high-speed data acquisition unit: receiving a three-phase standard square wave voltage signal or a three-phase synchronous square wave voltage signal transmitted by the filtering unit; counting for 1 time when the square wave voltage signal meets a zero crossing point, calculating a counting result j =1,2,3 \8230, wherein \8230, q and q are positive integers, and transmitting the counting result to a central processing unit;
a central processing unit: firstly, sending a gyro motor starting signal to a motor control unit, and after the motor control unit controls an external gyro motor to reach synchronous rotating speed, sending a power-off control signal by a central processing unit and transmitting the power-off control signal to the motor control unit; synchronously receiving the counting result transmitted by the high-speed data acquisition unit, storing the counting result, and calculating a back electromotive force half period Tj; tj is the counting result multiplied by the inherent trigger time of the crystal oscillator of the counter, and the counting result and the back electromotive force half period Tj are transmitted to an upper computer data analysis and calculation unit through a communication unit;
a communication unit: receiving the counting result and the back electromotive force half period T transmitted from the central processing unit j And the counting result and the back electromotive force half period T are compared j Transmitting the data to an upper computer data analysis and calculation unit;
the upper computer data analysis and calculation unit: receiving the counting result and the back electromotive force half period T transmitted by the communication unit j (ii) a Calculating to obtain inertial running time, touchdown rotating speed and touchdown resisting moment parameters; the inertial running time, the touchdown rotating speed and the touchdown resistance moment are transmitted to a test result display and storage unit;
the test result display and storage unit: receiving inertial running time, touchdown rotating speed and touchdown resistance moment transmitted by an upper computer data resolving and analyzing unit; displaying and storing real-time numerical values of the rotating speed in the testing process; and the parameters of the touchdown resistance moment, the touchdown time, the touchdown rotating speed and the touchdown resistance moment are displayed on a test result interface after the test is finished.
The gyro motor is started by the central processing unit, and the control signal is transmitted to the motor control unit, the motor drive part of the motor control unit controls the motor to start, when the gyro motor reaches synchronous speed, the central processing unit sends out power-off control signal, and transmits the control signal to the motor control unit, and synchronously triggers the high-speed counter to start counting, the motor control unit receives the power-off control signal from the central processing unit, and outputs the control signal to the motor drive part to control the start, power-off and stop of the gyro motor(ii) a The voltage sensor unit is used for testing three-phase back electromotive force of the gyro motor after power failure, generating three-phase sinusoidal voltage signals and transmitting the three-phase sinusoidal voltage signals to the three-phase voltage acquisition unit of the lower computer; the three-phase voltage acquisition unit transmits the acquired three-phase sinusoidal voltage signals to the voltage comparison unit; the voltage comparison unit compares the three-phase sinusoidal voltage signal with a standard voltage, judges whether the voltage is within the voltage signal range of the high-speed data acquisition unit, and transmits the comparison result to the signal conditioning unit; if the three-phase sinusoidal voltage signals collected by the signal conditioning unit are within the voltage signal range of the high-speed data acquisition unit, no processing is performed, and if the three-phase sinusoidal voltage signals are not within the voltage signal range of the high-speed data acquisition unit, voltage reduction processing is performed; the three-phase sinusoidal voltage signals in the voltage signal range are subjected to square wave conversion and converted into three-phase standard square wave voltage signals, and the processed three-phase square wave voltage signals are transmitted to a filtering unit; when the amplitude of the three-phase standard square wave voltage signal received by the filtering unit is not within the filtering voltage range, the signal is directly transmitted to the high-speed data acquisition unit; when the amplitude of the square wave voltage signal is within the effective filtering voltage range, filtering and differential amplification processing are carried out, a three-phase standard square wave voltage signal with the voltage amplitude within (-1.25V, + 1.25V) is subjected to noise filtering, the voltage amplitude is amplified by 10 times, the frequency is kept synchronous, a three-phase synchronous square wave voltage signal is generated, and the three-phase synchronous square wave voltage signal is transmitted to a high-speed data acquisition unit; the high-speed data acquisition unit receives the three-phase standard square wave voltage signal and the three-phase synchronous square wave voltage signal transmitted by the filtering unit, square wave counting signals generated by the high-precision counter respectively enter a counting enabling end and a high-speed analog quantity acquisition end in the high-speed data acquisition unit, and counting results and zero-crossing signals are transmitted to the central processing unit; the central processing unit receives the counting signal and the zero-crossing acquisition signal transmitted by the high-speed data acquisition unit, stores and counter electromotive force half-cycle time T j Calculation, j =1,2,3 \8230; \8230q; t is a unit of j Multiplying the value of the square wave counting signal between every two zero-crossing signals by the inherent trigger time of the crystal oscillator of the counter, and adding the square wave counting signal and the time period T j The value is transmitted to the upper computer processing part through the communication unit; the upper computer data analysis resolving unit receives the reverse current transmitted by the communication unitTime T of dynamic half period j And the required motor characteristic parameters can be obtained through the following calculation principle: including touchdown resistance moment, touchdown time, touchdown speed, inertial running time, etc.
The method for calculating the parameters of the inertial running time, the touchdown rotating speed and the touchdown resistance moment comprises the following steps:
coasting time T:
the unit s;
wherein, T j Counter electromotive force half period T for the process from motor power-off to rotor stalling j The unit is s; q is all half cycles of the three-phase counter potential signal in the process from the power-off of the motor to the stop of the rotor, namely a counting result;
change value delta T of adjacent half period in power-off inertia running process j Comprises the following steps:
ΔT j ＝T j -T j-1 j =1,2,3, \8230 \ 8230q, unit s;
time to ground T c : the time from the power failure of the external gyro motor to the touchdown of the external gyro motor, wherein c is the half-cycle number of voltage at the touchdown time, and c is a positive integer, and the gyro motor is determined to be touchdown when q = c;
the unit s;
and (3) judging the ground contact rotating speed: the value of change Δ T of adjacent half-cycles c If the value is larger than the empirical set value delta, the value of c can be solved;
ΔT c ＝|T c -T c-1 |&δ, unit s;
real-time rotation speed n:
n＝60/p(T j +T j-1 ) Unit rpm;
ground contact rotating speed n c ：
n c ＝60/p(T c +T c-1 ) Unit rpm;
fluctuation of rotational speed Δ ω j ：
ω j ＝π/T j ；Δω j ＝π/T j -π/T j-1
Wherein p is the number of pole pairs of the motor;
ω j the unit is rad/s for the rotation angular velocity of the motor;
△ω j is the rotation angular velocity variation with unit of rad/s;
rotational resistance moment M: the total resisting moment borne by the external gyro motor in the process of stopping after power failure;
ground contact resistance moment M c : is T c Rotational moment of resistance at touchdown time;
wherein J is the rotary inertia of the external gyro motor rotor; delta omega c The unit of the variation of the rotation angular speed of the gyro motor at the moment of touchdown is rad/s;
as shown in fig. 2, which is a diagram of a waveform conversion principle of a back electromotive force method, it can be known that a voltage sensor unit tests three-phase back electromotive force of a gyro motor after power failure to generate a three-phase sinusoidal voltage signal, and the three-phase sinusoidal voltage signal is transmitted to a three-phase voltage acquisition unit of a lower computer; the three-phase voltage acquisition unit transmits the acquired three-phase sinusoidal voltage signals to the voltage comparison unit; the voltage comparison unit compares the three-phase sinusoidal voltage signal with the standard voltage, and the voltage span interval of the back electromotive force voltage of the motor to be measured is large, so that the rotating speed is high, and the amplification and reduction times of the voltage are adjusted according to different conditions so as to meet the requirement of AD measurement. The measurement and signal conditioning work of a circuit is realized by using a high-speed programmable instrument amplifier, attenuation and amplification are arranged in a signal path, differential output is needed to drive a high-performance analog-digital converter, a programmable gain instrument amplifier is cascaded with a fully differential funnel (attenuation) amplifier, the programmable gain instrument amplifier provides high differential input impedance and-110 dB total harmonic distortion, the comparison and adjustment of three-phase sinusoidal voltage signals can be realized, and the three-phase sinusoidal voltage signals are adjusted to be within the voltage signal range of a high-speed data acquisition unit. Meanwhile, the moment of power failure is judged by external power failure triggering and waveform conversion of internal positive and negative electromotive force, a high-speed external interruption judgment processor and a high-speed AD (the speed is 28 Msps) are needed, namely, the waveform in a 1kHz frequency can be continuously sampled 2333 times in one period, the conversion time and the waveform conversion slope can be very quickly judged, and a three-phase sinusoidal voltage signal is synchronously converted into a three-phase standard square wave signal.
The counting signal is generated by a high-speed data acquisition unit selecting a high-precision counter with the clock frequency of 200MHz, and the clock frequency can reach 330M by utilizing a frequency multiplier; by taking a 4-way 32-bit superposable accumulation counter, the maximum value of countable is 232, i.e. the minimum countable resolution time is 0.003 microseconds, which is enough to satisfy the resolution response error time of microsecond level. At the starting moment of the test, the central processing unit synchronously triggers the high-speed counter to start counting, receives the counting signal and the zero-crossing collecting signal transmitted by the high-speed data collecting unit, stores all the signals and calculates the back electromotive force half period T j ，j＝1，2，3……q；T j Multiplying the value of the square wave counting signal between every two zero-crossing signals by the inherent trigger time of the counter crystal oscillator, and enabling the square wave counting signal and the counter electromotive force half cycle T j Transmitted to the upper computer processing part through the communication unit and processed by the formula delta T c ＝|T c -T c-1 |>, delta, change value delta T when adjacent half period c When the contact time is larger than the experience set value delta, the judgment of the contact time of the gyro motor can be realized.
The working principle of the invention is as follows:
the leading-out wire of the dynamic pressure motor is reliably connected with the corresponding phase sequence of the motor power supply according to the phase sequence, and the tester is also connected to the leading-out wire of the motor according to the corresponding phase sequence. And controlling the motor to start, cutting off a power supply of the dynamic pressure motor after the dynamic pressure motor is stabilized to the synchronous rotating speed, and collecting the counter electromotive force data of the motor from the power-off moment until the motor stops rotating. The high-speed data acquisition unit acquires voltage signals of the back electromotive force element, transmits the voltage signals to the central processing unit for data processing, and calculates the processed data to the upper computer through the communication unit to obtain required parameters of the gyro motor, wherein the parameters comprise real-time rotating speed, ground contact resistance moment, inertial running time, ground contact time and ground contact rotating speed.
Compared with the prior art, the invention has the advantages that:
at present, the method for measuring the characteristic parameters of the dynamic pressure gyro motor is to measure the mechanical characteristics of the dynamic pressure gyro motor by matching a power meter with a reaction torque tester in a motor state. However, when the dynamic pressure motor is installed in a gyro instrument or installed on an inertia platform, the quality of the motor body and the dynamic pressure bearing can be indirectly judged only by collecting the voltage and the current of the gyro motor, but the most critical moment parameter of the air bearing of the motor cannot be measured, so that the direct quantitative evaluation of the air bearing is not formed from the installation of the gyro motor in the instrument and the platform to the final springing-up use. By using the high-speed dynamic pressure gyro motor ground-contact rotating speed testing system, only an outgoing line between the gyro motor and a power supply needs to be connected into the system, and characteristic parameters such as real-time rotating speed, ground-contact resistance moment, inertial running time, ground-contact rotating speed and the like can be obtained by measuring and calculating three opposite potential signals of the gyro motor, so that the states of the dynamic pressure motor and an air bearing can be judged, and reliable reference is provided for instruments and an inertial platform.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (6)
1. The utility model provides a high-speed dynamic pressure top motor contacts to earth rotational speed test system which characterized in that: the device comprises a motor control unit, a voltage sensor unit, a three-phase voltage acquisition unit, a voltage comparison unit, a signal conditioning unit, a filtering unit, a high-speed data acquisition unit, a central processing unit, a communication unit, an upper computer data analysis and calculation unit and a test result display and storage unit;
a motor control unit: receiving a control signal transmitted by the central processing unit, and controlling the starting and stopping of an external gyro motor;
a voltage sensor unit: testing three-phase back electromotive force of an external gyro motor after power failure to generate a three-phase voltage signal, and transmitting the three-phase voltage signal to a three-phase voltage acquisition unit;
three-phase voltage acquisition unit: collecting three-phase voltage signals transmitted by a voltage sensor unit, and transmitting the three-phase voltage signals to a voltage comparison unit;
a voltage comparison unit: receiving a three-phase voltage signal transmitted by a three-phase voltage acquisition unit, and comparing the three-phase voltage signal with a standard voltage; when the voltage amplitude is larger than 12V, the three-phase voltage signals are output to the signal conditioning unit; when the voltage amplitude is 1.25-12V, the three-phase voltage signals are output to the signal conditioning unit; when the voltage amplitude is 0-1.25V, transmitting the three-phase voltage signals to a filtering unit;
a signal conditioning unit: receiving a three-phase voltage signal with a voltage amplitude larger than 12V transmitted by the voltage comparison unit, performing voltage reduction processing, adjusting the voltage to be within 1.25-12V, performing square wave conversion to generate a three-phase standard square wave voltage signal, and transmitting the three-phase standard square wave voltage signal to the filtering unit; receiving three-phase voltage signals with the voltage amplitude of 1.25-12V transmitted by the voltage comparison unit, performing square wave conversion to generate three-phase standard square wave voltage signals, and transmitting the three-phase standard square wave voltage signals to the filtering unit; receiving the boosted three-phase voltage signals transmitted by the filtering unit, performing square wave conversion on the three-phase voltage signals to convert the three-phase voltage signals into three-phase standard square wave voltage signals, and transmitting the three-phase standard square wave voltage signals to the filtering unit;
a filtering unit: receiving a 0-1.25V three-phase voltage signal transmitted by the voltage comparison unit, adjusting the voltage signal to be within 1.25-12V after filtering and boosting, and outputting the boosted three-phase voltage signal to the signal conditioning unit; receiving a three-phase standard square wave voltage signal transmitted by the signal conditioning unit, and directly outputting the three-phase standard square wave voltage signal to the high-speed data acquisition unit; or the three-phase standard square wave voltage signal is generated into a three-phase synchronous square wave voltage signal and then transmitted to the high-speed data acquisition unit;
a high-speed data acquisition unit: receiving a three-phase standard square wave voltage signal or a three-phase synchronous square wave voltage signal transmitted by a filtering unit; counting for 1 time when the square wave voltage signal meets a zero crossing point, calculating a counting result j =1,2,3 \ 8230, wherein \ 8230, q and q are positive integers, and transmitting the counting result to a central processing unit;
a central processing unit: firstly, sending a gyro motor starting signal to a motor control unit, and after the motor control unit controls an external gyro motor to reach a synchronous rotating speed, sending a power-off control signal by a central processing unit and transmitting the power-off control signal to the motor control unit; synchronously receiving the counting result transmitted by the high-speed data acquisition unit, storing the counting result, and calculating a back electromotive force half period Tj; tj is the counting result multiplied by the inherent trigger time of the crystal oscillator of the counter, and the counting result and the back electromotive force half period Tj are transmitted to an upper computer data analysis and calculation unit through a communication unit;
a communication unit: receiving the counting result and the back electromotive force half period T transmitted from the central processing unit j And the counting result and the back electromotive force half period T are compared j Transmitting the data to an upper computer data analysis and calculation unit;
the upper computer data analysis and calculation unit: receiving the counting result and the back electromotive force half period T transmitted by the communication unit j (ii) a Calculating to obtain inertial running time, touchdown rotating speed and touchdown resisting moment parameters; the inertial running time, the touchdown rotating speed and the touchdown resisting moment are transmitted to a test result display and storage unit;
the test result display and storage unit: receiving inertial running time, touchdown rotating speed and touchdown resisting moment transmitted by an upper computer data resolving analysis unit; displaying and storing real-time numerical values of the rotating speed in the testing process; and the parameters of the touchdown resistance moment, the touchdown time, the touchdown rotating speed and the touchdown resistance moment are displayed on a test result interface after the test is finished.
2. The touchdown rotation speed testing system of the high-speed dynamic pressure gyro motor as claimed in claim 1, wherein: in the filtering unit, when the amplitude of the three-phase standard square wave voltage signal is not in a set filtering voltage range, the filtering unit directly outputs the three-phase standard square wave voltage signal to the high-speed data acquisition unit; when the amplitude of the three-phase standard square wave voltage signal is within the filtering voltage range, the filtering unit carries out filtering and differential amplification processing on the three-phase standard square wave voltage signal, noise filtering is carried out on the three-phase standard square wave voltage signal with the voltage amplitude within the preset voltage range, the voltage amplitude is amplified by 10 times, the frequency is kept synchronous, a three-phase synchronous square wave voltage signal is generated, and the three-phase synchronous square wave voltage signal is transmitted to the high-speed data acquisition unit.
3. The touchdown rotation speed testing system of the high-speed dynamic pressure gyro motor as claimed in claim 2, wherein: the set filter voltage range is-1- +1V; the preset voltage range is as follows: -1.25- +1.25V.
4. The touchdown rotation speed testing system of the high-speed dynamic pressure gyro motor as claimed in claim 1, wherein: the method for calculating the parameters of the inertial running time, the touchdown rotating speed and the touchdown resistance moment comprises the following steps:
coasting time T:
the unit s;
wherein, T j Counter electromotive force half period T for the process from motor power-off to rotor stalling j The unit is s; q is all half cycles of the three-phase counter potential signal in the process from the power-off of the motor to the stop of the rotor, namely a counting result;
change value delta T of adjacent half period in power-off inertia running process j Comprises the following steps:
ΔT j ＝T j -T j-1 j =1,2,3 \ 8230q \ 8230;
time to contact ground T c : the time from the power failure of the external gyro motor to the touchdown of the external gyro motor, wherein c is the half-cycle number of voltage at the touchdown time, and c is a positive integer, and the gyro motor is determined to be touchdown when q = c;
the unit s;
and (3) judging the ground contact rotating speed: the value of change Δ T of adjacent half-cycles c If the value is larger than the empirical set value delta, the value of c can be solved;
ΔT c ＝|T c -T c-1 |&δ, unit s;
real-time rotation speed n:
n＝60/p(T j +T j-1 ) Unit rpm;
ground contact rotating speed n c ：
n c ＝60/p(T c +T c-1 ) Unit rpm;
fluctuation of rotational speed Δ ω j ：
ω j ＝π/T j ；Δω j ＝π/T j -π/T j-1
Wherein p is the number of pole pairs of the motor;
ω j is the rotation angular velocity of the motor, and the unit is rad/s;
△ω j is the rotation angular velocity variation with unit of rad/s;
rotational resistance moment M: the sum of resisting moment borne by an external gyro motor in the process of stalling after power failure;
touchdown resistance moment M c : is T c Rotational resistance moment at touchdown time;
wherein J is the rotary inertia of the external gyro motor rotor; delta omega c The unit of the variation of the rotation angular speed of the gyro motor at the moment of touchdown is rad/s.
5. The touchdown rotation speed testing system for the high-speed dynamic pressure gyro motor as claimed in claim 1, wherein: in the signal conditioning unit, a programmable gain instrument amplifier and a fully differential funnel attenuation amplifier are cascaded to provide high differential input impedance and-110 dB total harmonic distortion, the amplitude of a back electromotive force signal is adjusted to be in a tested effective range of-12 to +12V, and meanwhile, a back electromotive force three-phase sine wave signal is converted into a square wave signal.
6. The touchdown rotation speed testing system of the high-speed dynamic pressure gyro motor as claimed in claim 1, wherein: the filtering unit is an anti-aliasing filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610080920.8A CN105738807B (en) | 2016-02-04 | 2016-02-04 | A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610080920.8A CN105738807B (en) | 2016-02-04 | 2016-02-04 | A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105738807A CN105738807A (en) | 2016-07-06 |
| CN105738807B true CN105738807B (en) | 2018-06-01 |
Family
ID=56241896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610080920.8A Active CN105738807B (en) | 2016-02-04 | 2016-02-04 | A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105738807B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107193235B (en) * | 2017-06-26 | 2020-07-21 | 中国核动力研究设计院 | Method for processing nuclear grade shielding pump rotating speed signal |
| CN107687949B (en) * | 2017-10-11 | 2023-08-22 | 辽宁工程技术大学 | Device for detecting rotation speed and vibration of starter of aero-engine |
| CN110275107A (en) * | 2018-03-14 | 2019-09-24 | 上海鸣志电器股份有限公司 | A kind of test method of motor location torque |
| CN110388303B (en) * | 2018-04-20 | 2020-05-12 | 新疆金风科技股份有限公司 | Method, device and system for measuring rotating speed of wind generating set |
| CN108768350B (en) * | 2018-05-23 | 2021-11-23 | 成都玖锦科技有限公司 | Method for generating stable square wave with independently adjustable upper edge and lower edge |
| CN108957322B (en) * | 2018-08-24 | 2021-08-20 | 佛山市顺德区金泰德胜电机有限公司 | Method for measuring back electromotive force of permanent magnet motor and measuring device used by method |
| CN112946472B (en) * | 2021-02-06 | 2022-12-09 | 北华航天工业学院 | Dynamic pressure air-floating motor health state assessment device and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3231587C2 (en) * | 1981-08-26 | 1986-02-20 | Hitachi, Ltd., Tokio/Tokyo | Method and arrangement for detecting the friction location and the friction characteristics in a rotary machine |
| US6591200B1 (en) * | 1998-06-16 | 2003-07-08 | M.E.A. Motor Inspection Ltd. | Method and system for performance testing of rotating machines |
| CN202854161U (en) * | 2012-10-15 | 2013-04-03 | 赵小丽 | Measurement apparatus for rotating speed of asynchronous motor |
| CN103411764A (en) * | 2013-08-09 | 2013-11-27 | 北京航天控制仪器研究所 | Inner rotor type gyro motor testing device |
| CN104198754A (en) * | 2014-09-11 | 2014-12-10 | 中国人民解放军海军航空工程学院青岛校区 | Aero-engine rotation speed testing system |
| CN104198935A (en) * | 2014-06-30 | 2014-12-10 | 北京航天控制仪器研究所 | Dynamic pressure motor parameter monitoring system and monitoring method |
| CN204462180U (en) * | 2014-10-31 | 2015-07-08 | 北京兴华机械厂 | The measurement mechanism of gyro machine rotating speed under a kind of enclosed environment |
| CN105116331A (en) * | 2015-09-08 | 2015-12-02 | 哈尔滨工业大学 | Test method for motor under high-temperature and high-pressure environment |
-
2016
- 2016-02-04 CN CN201610080920.8A patent/CN105738807B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3231587C2 (en) * | 1981-08-26 | 1986-02-20 | Hitachi, Ltd., Tokio/Tokyo | Method and arrangement for detecting the friction location and the friction characteristics in a rotary machine |
| US6591200B1 (en) * | 1998-06-16 | 2003-07-08 | M.E.A. Motor Inspection Ltd. | Method and system for performance testing of rotating machines |
| CN202854161U (en) * | 2012-10-15 | 2013-04-03 | 赵小丽 | Measurement apparatus for rotating speed of asynchronous motor |
| CN103411764A (en) * | 2013-08-09 | 2013-11-27 | 北京航天控制仪器研究所 | Inner rotor type gyro motor testing device |
| CN104198935A (en) * | 2014-06-30 | 2014-12-10 | 北京航天控制仪器研究所 | Dynamic pressure motor parameter monitoring system and monitoring method |
| CN104198754A (en) * | 2014-09-11 | 2014-12-10 | 中国人民解放军海军航空工程学院青岛校区 | Aero-engine rotation speed testing system |
| CN204462180U (en) * | 2014-10-31 | 2015-07-08 | 北京兴华机械厂 | The measurement mechanism of gyro machine rotating speed under a kind of enclosed environment |
| CN105116331A (en) * | 2015-09-08 | 2015-12-02 | 哈尔滨工业大学 | Test method for motor under high-temperature and high-pressure environment |
Non-Patent Citations (1)
| Title |
|---|
| 气体动压轴承技术在陀螺电机中的应用;李建春等;《微电机》;20120630;第45卷(第6期);第80-82页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105738807A (en) | 2016-07-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105738807B (en) | A kind of high speed dynamic pressure gyro machine contacts to earth rotary speed test system | |
| CN102155984B (en) | General vibration signal measuring system of fan | |
| AU748970B2 (en) | Method and system for performance testing of rotating machines | |
| CN108957322B (en) | Method for measuring back electromotive force of permanent magnet motor and measuring device used by method | |
| CN106769041B (en) | Permanent magnet synchronous motor bearing online fault diagnosis device and method under variable rotating speed working condition | |
| CN103344368B (en) | Based on the squirrel cage asynchronous motor efficiency on-line monitoring method can surveying electric parameters | |
| CN103926636A (en) | Rainfall data processing system based on piezoelectricity acceleration sensor | |
| CN108196213A (en) | Zero-bit angle test device, the method and system of a kind of rotary transformer | |
| CN102890477A (en) | On-line active dynamic balance measurement and control device and on-line active dynamic balance measurement and control method | |
| CN106291058A (en) | Counter electromotive force measuring device and method of motor | |
| CN102353500B (en) | Extraction method of unbalanced signal for dynamic balance measurement | |
| CN103308706A (en) | Method and device for detecting rotating speed of vane pump | |
| CN207780217U (en) | A kind of zero-bit angle test device of rotary transformer | |
| Zhou et al. | Transient measurement of mechatronic multi-parameters and kinetics performances for linear piezoelectric motors | |
| CN110672873A (en) | Brushless direct current motor rotating speed measuring device and using method thereof | |
| CN102829905B (en) | Friction torque measuring method for service life evaluation of ball bearing for motor | |
| CN101710134B (en) | Vehicle hub rotation speed sensor electrical parameter test device and test method | |
| CN206410670U (en) | The mount state testing device of inductosyn | |
| Roque et al. | Sensorless speed estimation for inductions motors using slot harmonics and time-based frequency estimation | |
| CN220552953U (en) | Testing device for measuring motor rotation zero position | |
| CN204065384U (en) | A kind of device detecting hall sensor | |
| CN109962648B (en) | Motor zero position detection method and system | |
| Arif et al. | Rotating magnetic field based instantaneous angular speed measurement of low speed rotating machines | |
| CN108832860A (en) | Portable electronic magnetic linkage torque tester | |
| EP1607759A1 (en) | Apparatus for detecting the operating characteristics of electric motors |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220425 Address after: Room 411, 4th floor, building 3, yard 7, Shixing street, Shijingshan District, Beijing 100043 Patentee after: Beijing Aerospace Wanrun High Tech Co.,Ltd. Address before: 142 box 403, box 100854, Beijing, Beijing, Haidian District Patentee before: BEIJIGN INSTITUTE OF AEROSPACE CONTROL DEVICES |