CN111413017B - Method for testing tension constant of voice coil motor - Google Patents
Method for testing tension constant of voice coil motor Download PDFInfo
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- CN111413017B CN111413017B CN202010233225.7A CN202010233225A CN111413017B CN 111413017 B CN111413017 B CN 111413017B CN 202010233225 A CN202010233225 A CN 202010233225A CN 111413017 B CN111413017 B CN 111413017B
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- voice coil
- coil motor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0033—Force sensors associated with force applying means applying a pulling force
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
- G01L1/127—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress by using inductive means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
- G01L5/0038—Force sensors associated with force applying means applying a pushing force
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- Analytical Chemistry (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention provides a method for testing the tension constant of a voice coil motor, which comprises the following steps: connecting a voice coil motor to be tested with a motion device capable of stably moving, wherein the motion device can stably drag the voice coil motor to generate motion; a tension testing device is connected between the voice coil motor to be tested and the movement device and is used for detecting the tension F required by the voice coil motor to be tested in the movement process; a current sensor is connected in series in a coil of a voice coil motor to be detected to form a closed loop; the current sensor is used for measuring the magnitude I of induced current when the voice coil motor to be measured moves passively; (4) according to the collected pulling force F and current I, a constant k is solved, and the formula is solved as follows: k is Δ F/Δ I. The invention can accurately measure the push (pull) force constant of the voice coil motor, and can still accurately measure the push (pull) force constant of the voice coil motor under the influence of more external interference factors.
Description
Technical Field
The invention belongs to the technical field of precision and relates to performance parameter measurement of a voice coil motor. The method can effectively and accurately measure the push (pull) force constant.
Background
The current linear motors are of the types: an ac linear induction motor, a linear ac synchronous motor, a linear dc motor, a linear stepping motor, and a hybrid linear motor. The voice coil motor belongs to a linear motor and is widely applied to actual processing, production and other occasions, so that the determination of various performance parameters such as mechanical property, stability and the like of the voice coil motor is particularly important.
The current testing method for testing the voice coil motor generally comprises the steps that the motor is electrified through a power supply system, when the motor is in a magnetic field, an electrified lead generates ampere force in the magnetic field, the ampere force is the acting force of the magnetic field on current, the force is determined by the magnetic field strength, the current and the effective length of the lead, under the condition that the current direction is vertical to the magnetic field direction, F is BIL, the force direction is determined by the magnetic field direction and the current direction, and the rule follows the left-hand rule.
If the thrust constant of the voice coil motor is to be measured, if the measurement is performed according to the formula F ═ BIL, the magnetic field strength is measured, and it is difficult to accurately measure the magnetic field strength.
Disclosure of Invention
The invention aims to provide a method for testing the pull constant of a voice coil motor, which aims to rapidly and accurately test the push (pull) force constant of the voice coil motor. The invention can effectively measure the push (pull) force constant under the influence of different environments and other interference factors.
The invention comprises the following steps:
step 1, connecting a voice coil motor to be tested with a motion device capable of stably moving, wherein the motion device can stably drag the voice coil motor to generate motion;
the type of the motion device capable of stably moving is as follows: KK60D10C-600A 1-F0;
step 2, connecting a tension testing device between the voice coil motor to be tested and the movement device, and detecting the tension F required by the voice coil motor to be tested in the movement process;
the tensile force sensor of the tensile force testing device has the following model: DYLY-106
Step 3, forming a closed loop after connecting a current sensor in series in a coil of the voice coil motor to be detected; the current sensor is used for measuring the magnitude I of induced current when the voice coil motor to be measured moves passively;
the model of the current sensor is WCS 2705;
step 4, solving a constant k according to the collected tension F and the current I, wherein the formula is as follows:
k＝ΔF/ΔI；
wherein, Δ F is the difference of the corresponding pulling forces of any two different speeds v1 and v2 when the robot moves passively; Δ I is the difference in current measured by the current sensors corresponding to velocities v1 and v2 when in passive motion.
The invention takes the voice coil motor to be tested as a driven mechanism and the moving device as a driving mechanism, thereby reducing the influence of the external environment on constant calculation.
Because the friction resistance of the coil cannot change along with the movement speed of the coil in the movement process, any pair of two sets of data in the data measured for many times are used, and meanwhile, in order to ensure the accuracy of the obtained constant k, the k values obtained through many times of calculation are averaged.
The invention is not obtained by measuring the power supply current and the subsequent ampere force when testing and calculating the force constant, but by generating the induction current by the movement of the coil in the magnetic field. The pulling force required by the voice coil motor in the process of uniform motion is equal to the sum of ampere force and frictional resistance, and the frictional resistance cannot change along with the motion speed, so that delta F is F2-F1Namely, the difference of ampere force formed by the induced current generated by the voice coil motor under different movement speeds effectively avoids the interference of friction force.
The invention has the following beneficial effects:
the invention is based on the formula F-k I, i.e. the force constant k can be calculated from the force Δ F and the current Δ I. When a fixed pushing (pulling) force is applied to the voice coil motor, the voice coil motor starts to move, induction current is generated in a magnetic field, and the force F and the current I are measured for multiple times, so that the pushing (pulling) force constant of the voice coil motor can be calculated. In the method, the delta F and the delta I are used for calculation, so that the influence of the friction resistance and other influencing factors on the test result in the test process can be effectively eliminated.
As shown in FIG. 5, the accuracy of the constant tested by the present invention can be improved by more than 70%.
Drawings
FIG. 1 is a test apparatus of the present invention;
FIG. 2 is a flow chart of the method of the present invention;
FIG. 3 is a data statistic collected in the present invention;
fig. 4 is a wiring schematic of the force sensor of the present invention.
FIG. 5 is a data chart of the inventive test.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a device for testing a thrust constant of a voice coil motor includes a voice coil motor, a tension sensor, and a motion device.
And fixing the voice coil motor base on the reference workbench, fixing the stator of the voice coil motor base, and connecting the rotor with the tension sensor. And the sliding block of the movement device is connected with the other end of the tension sensor. The slider of the moving device drives the tension sensor to move, the tension sensor drives the rotor of the voice coil motor to move, and when the stator and the rotor of the voice coil motor generate relative motion, induced electromotive force can be generated. And finally, connecting a current detection sensor in series at two ends of the coil of the voice coil motor, and detecting and recording the magnitude of induced current in the coil in the motion process.
As shown in fig. 2, a method for testing a tension constant of a voice coil motor specifically includes the following steps:
(1) connecting a voice coil motor to be tested with a motion device capable of stably moving, wherein the motion device can stably drag the voice coil motor to generate motion;
(2) a tension testing device is connected between the voice coil motor to be tested and the movement device and is used for detecting the tension F required by the voice coil motor to be tested in the movement process;
(3) a current sensor is connected in series in a coil of a voice coil motor to be detected to form a closed loop; the current sensor is used for measuring the magnitude I of induced current when the voice coil motor to be measured moves passively;
(4) according to the collected pulling force F and current I, a constant k is solved, and the formula is solved as follows:
k＝ΔF/ΔI；
wherein, Δ F is the difference of the corresponding pulling forces of any two different speeds v1 and v2 when the robot moves passively; Δ I is the difference in current measured by the current sensors corresponding to velocities v1 and v2 when in passive motion.
As shown in fig. 3, two sets of data, such as 01 and 03 sets of data, are arbitrarily selected, where Δ F ═ F1-F3，ΔI＝I1-I3Thus, Δ F and Δ I represent the difference between the ampere force and the induced current generated by the data of group 01 and 03 at two different moving speeds.
Finally, since the frictional resistance of the coil does not change with the moving speed of the coil during the moving process, the force F and the current I of two corresponding groups of data in multiple groups of data obtained in multiple tests are subtracted by combining the formula k to obtain the k to be Δ F/Δ I. In order to ensure the accuracy of the obtained constant K, the K values obtained by multiple calculations are averaged.
Since the force provided by the voice coil motor can be a pushing force or a pulling force in different occasions, the pulling force sensor and the pushing force sensor need to be replaced, as shown in fig. 4, (401) represents "excitation +", (402) represents "signal +", (403) represents "excitation-", and (404) represents "signal-", when the sensor changes from detecting "pushing force" to detecting "pulling force" or from detecting "pulling force" to detecting "pushing force", the (402) "signal +" and (404) represent "signal-" can be exchanged according to the principle of the bridge method.
As shown in fig. 5, the accuracy of the constant obtained by the test of the present invention can be improved by more than 70% compared with the actively measured constant.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the invention.
Claims (1)
1. A method for testing the tension constant of a voice coil motor is characterized by comprising the following steps:
(1) connecting a voice coil motor to be tested with a motion device capable of stably moving, wherein the motion device can stably drag the voice coil motor to generate motion;
(2) a tension testing device is connected between the voice coil motor to be tested and the movement device and is used for detecting the tension F required by the voice coil motor to be tested in the movement process;
(3) a current sensor is connected in series in a coil of a voice coil motor to be detected to form a closed loop; the current sensor is used for measuring the magnitude I of induced current when the voice coil motor to be measured moves passively;
(4) according to the collected pulling force F and current I, a constant k is solved, and the formula is solved as follows:
k＝ΔF/ΔI；
wherein, Δ F is the difference of the corresponding pulling forces of any two different speeds v1 and v2 when the robot moves passively; Δ I is the difference of the currents measured by the current sensors corresponding to the speeds v1 and v2 when the motor is in passive motion;
the voice coil motor to be tested is used as a driven mechanism, and the moving device is used as a driving mechanism, so that the influence of the external environment on constant calculation is reduced;
because the friction resistance of the coil cannot change along with the movement speed of the coil in the movement process, any pair of two sets of data in the data measured for many times are used, and meanwhile, in order to ensure the accuracy of the constant k, the k values obtained through many times of calculation are averaged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010233225.7A CN111413017B (en) | 2020-03-29 | 2020-03-29 | Method for testing tension constant of voice coil motor |
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| CN202010233225.7A CN111413017B (en) | 2020-03-29 | 2020-03-29 | Method for testing tension constant of voice coil motor |
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| CN111413017B true CN111413017B (en) | 2022-01-04 |
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| CN115655548A (en) * | 2022-10-18 | 2023-01-31 | 北京瑞控信科技股份有限公司 | Automatic testing system for static mechanical property of voice coil motor |
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| JPS61124256A (en) * | 1984-11-21 | 1986-06-12 | Showa Electric Wire & Cable Co Ltd | Dynamically measuring method of thrust of voice-coil type linear motor |
| CN102109575B (en) * | 2009-12-25 | 2015-02-11 | 上海微电子装备有限公司 | Method, device and system for testing linear motor based on virtual instrument |
| CN102435944B (en) * | 2011-08-25 | 2014-01-22 | 哈尔滨工业大学 | Method for testing force characteristic of linear electric motor |
| CN103926031B (en) * | 2014-04-24 | 2016-01-20 | 中南大学 | The thrust measurement method of linear electric motors and detection system |
| CN107314851A (en) * | 2017-07-31 | 2017-11-03 | 哈尔滨工业大学 | Linear motor thrust testing device and the method using the measurement device force oscillation |
| CN107991609A (en) * | 2017-11-09 | 2018-05-04 | 陕西盛迈石油有限公司 | A kind of linear motor force constant rapid assay methods |
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