CN1427540A - Sensorless brushless DC motor operation control method - Google Patents
Sensorless brushless DC motor operation control method Download PDFInfo
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- CN1427540A CN1427540A CN01144375A CN01144375A CN1427540A CN 1427540 A CN1427540 A CN 1427540A CN 01144375 A CN01144375 A CN 01144375A CN 01144375 A CN01144375 A CN 01144375A CN 1427540 A CN1427540 A CN 1427540A
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Abstract
A control method for brushless DC motor without sensor includes such steps as detecting the temp of power supply element, deducing the temp of motor winding, deducing the phase resistance valve of motor, and controlling the drive voltage of motor.
Description
One, technical field
The present invention relates to a kind of progress control method of brushless DC motor without sensor, the temperature of particularly utilizing force device is inferred the phase resistance value of motor and is controlled the method for motor driven voltage.
Two, background technology
Generally speaking, brshless DC motor be controlled to be the control of no transducer, promptly utilize the phase current information of detected direct-current coupling current draw motor, and detect the phase voltage of motor separately and control its action.Fig. 1 is the drive circuit figure of general brushless electric machine, and its drive circuit mainly is made up of filter capacitor C1, C2, phase changer, motor and microcomputer.Filter capacitor C1, the C2 AC power after to rectification is carried out filtering; The direct voltage of phase changer after with rectifying and wave-filtering is transformed into by micro-processor controlled three-phase alternating voltage, with drive motors; Microcomputer then utilizes the voltage and current that is added on the above-mentioned motor to detect the position of rotor and control phase changer.
Fig. 2 is the block diagram of general electric machine without sensor control device, mainly is made up of comparator 1, speed control 2, voltage instruction generator 3, phase changer 4, current/voltage detector 6 and speed/positional operational part 7.Comparator 1 compares and exports corresponding comparison signal with required motor speed and present motor speed; Speed control 2 is according to the comparison signal output speed control signal of comparator 1; Voltage instruction generator 3 sends the correspondent voltage instruction after receiving the speed control signal of above-mentioned speed control 2 and motor rotor position signal; Behind the voltage instruction of phase changer 4 according to above-mentioned voltage instruction generator 3, be three-phase alternating voltage with the DC filtering voltage transformation; Voltage/voltage detector 6 detects each phase voltage and phase current at phase changer 4 outputs; 7 of speed/positional operational parts to its computing of stipulating, in the corresponding motor rotor position signal of output, are exported present motor velocity signal behind the current/voltage detection signal of receiving above-mentioned current/voltage detector 6 outputs.Below the course of work of traditional electric machine without sensor control device is illustrated.
At first, comparator 1 motor speed that the user is required and present motor velocity signal compare and export corresponding comparison signal.Speed control 2 is exported corresponding speed control signal behind the comparison signal of receiving comparator 1; If also promptly present motor speed is lower than the required motor speed of user, then output improves the speed control signal of motor speed; Otherwise then output reduces the speed control signal of motor speed.
Then, after voltage instruction generator 3 is received the motor rotor position signal of the speed control signal of speed control 2 and speed/positional operational part 7, the correspondent voltage instruction is added on each switch element of phase changer 4; Phase changer 4 becomes three-phase alternating voltage output by above-mentioned voltage instruction with DC filtering voltage Vdc; Motor 5 is promptly driven by the three-phase alternating voltage that phase changer 4 produces.
Simultaneously, current/voltage detector 6 detects each phase voltage and phase current at the output of phase changer 4; At this moment, speed/positional operational part 7 obtains from current/voltage detector 6 after the input of voltage and current its computing of stipulating, and to voltage instruction generator 3 and comparator 1 corresponding motor rotor position signal of output and present motor speed.
The above-mentioned course of work is constantly carried out repeatedly, with the driving of control motor 5.
When above-mentioned electric machine without sensor turns round for a long time, because the temperature rise of motor windings, the phase resistance value of motor will change, and the variation of the phase resistance value of each motor is not quite similar, thereby cause the whole motor cycle of operation to increase, this is the big technical problem that traditional electric machine without sensor control device exists.
Three, summary of the invention
Purpose of the present invention promptly is to provide a kind of progress control method of brushless DC motor without sensor, the motor malfunction that causes with the variation that prevents because of motor phase resistance value.
To achieve these goals, the present invention at first detects the temperature of phase changer source element and infers the temperature of motor windings in view of the above, utilizes the motor windings temperature of inferring to infer motor phase resistance value then and is added in the size of the driving voltage on the motor according to the phase resistance value control of inferring.
Utilize said method, can prevent the motor malfunction that the variation because of the motor phase resistance causes effectively.
Below in conjunction with specific embodiment technical characterictic of the present invention is described in further detail.
Four, description of drawings
Fig. 1 is the drive circuit figure of general brshless DC motor.
Fig. 2 is the block diagram of traditional no transducer DC machine control device.
Fig. 3 is the block diagram of brushless DC motor without sensor phase changer drive unit among the present invention.
Fig. 4 is the time-temperature variation of source element among Fig. 3.
Fig. 5 is the correlation figure of source element temperature and motor temperature among Fig. 3.
Fig. 6 is motor temperature and phase resistance value correlation figure among Fig. 3.
Five, embodiment
As shown in Figure 3, the control device among the present invention is same as shown in Figure 2, and its phase changer drive unit is made up of filter capacitor, phase changer, motor and microcomputer.The AC power of filter capacitor after to rectification carried out filtering; Phase changer becomes three-phase alternating voltage with filtered dc voltage conversion, with drive motors according to the Microcomputer Detecting signal; Microcomputer then adopts the voltage and current that is added on the motor to detect motor speed, phase changer source element temperature and motor windings temperature.Below the course of work of control device among the present invention is illustrated.
At first, comparator 1 motor speed that the user is required and present motor speed are in addition relatively and export corresponding comparison signal; Speed control 2 obtains the corresponding speed control signal of output behind the comparison signal of comparator 1, if promptly present motor speed is lower than required speed, then output improves the speed control signal of motor speed; Otherwise then output reduces the speed control signal of motor speed.
Then, after voltage instruction generator 3 is received the motor rotor position signal of the speed control signal of speed control 2 and speed/positional operational part 7, the correspondent voltage instruction is added on phase changer 4 each switch element; Phase changer 4 is by above-mentioned voltage instruction, and Vdc becomes three-phase alternating voltage with direct voltage, with drive motors 5.
Simultaneously, current/voltage detector 6 detects each phase voltage and electric current at the output of phase changer 4, by speed/positional operational part 7 it is carried out computing and exports corresponding motor rotor position signal and present motor velocity signal to voltage instruction generator 3 and comparator 1.
Said process is constantly showed on hard and is carried out, to realize the drive controlling of motor.
For detecting the phase resistance value, the present invention draws the time dependent curve of current element temperature as shown in Figure 4 at first by experiment.In addition, the temperature of source element and motor temperature have relation shown in Figure 5, according to this relation, can list the detection look-up table.When long-time driving brushless DC motor without sensor, the time interval according to the rules detects the temperature of relevant source element, and obtains and the corresponding motor temperature of this source element temperature with reference to above-mentioned detection look-up table.By experiment as can be known, above-mentioned motor temperature and motor phase resistance value have proportionate relationship shown in Figure 6, utilize this relation can utilize motor temperature to infer the phase resistance value of motor.Then, utilize the motor phase resistance value of inferring to change the size that is added in the voltage on the motor, can prevent that motor from misoperation occurring because of the phase resistance value changes.
In a word, the present invention utilizes the variations in temperature of source element, infers the phase resistance value behind the long playing motor winding temperature rise, and according to the driving voltage of the phase resistance value control motor of inferring, can effectively prevent the misoperation of motor.
Claims (3)
1, a kind of sensorless brushless DC motor operation control method, it is characterized in that at first detecting the temperature of source element and utilize detected source element temperature to infer the motor windings temperature, utilize the motor windings temperature of inferring to infer the size of the phase resistance value of motor and the motor phase resistance value control motor driven voltage that utilization is inferred then.
2, sensorless brushless DC motor operation control method according to claim 1 is characterized in that described motor windings temperature is by being inferred by the source element temperature of measuring and the detection look-up table of motor windings temperature relation table.
3, sensorless brushless DC motor operation control method according to claim 1 is characterized in that described motor phase resistance value is to utilize the proportionate relationship of phase resistance value and motor windings temperature to infer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01144375A CN1427540A (en) | 2001-12-18 | 2001-12-18 | Sensorless brushless DC motor operation control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01144375A CN1427540A (en) | 2001-12-18 | 2001-12-18 | Sensorless brushless DC motor operation control method |
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| CN1427540A true CN1427540A (en) | 2003-07-02 |
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| CN01144375A Pending CN1427540A (en) | 2001-12-18 | 2001-12-18 | Sensorless brushless DC motor operation control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1293698C (en) * | 2004-11-26 | 2007-01-03 | 南京航空航天大学 | Direct moment controlling system without position sensor for brushless D.C. motor by fundamental wave |
| CN100481664C (en) * | 2004-06-10 | 2009-04-22 | Abb有限公司 | Isolation measuring circuit of sensor resistance |
| CN101783640B (en) * | 2010-01-26 | 2012-11-21 | 深圳市今朝时代新能源技术有限公司 | Motor speed closed loop control method |
-
2001
- 2001-12-18 CN CN01144375A patent/CN1427540A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100481664C (en) * | 2004-06-10 | 2009-04-22 | Abb有限公司 | Isolation measuring circuit of sensor resistance |
| CN1293698C (en) * | 2004-11-26 | 2007-01-03 | 南京航空航天大学 | Direct moment controlling system without position sensor for brushless D.C. motor by fundamental wave |
| CN101783640B (en) * | 2010-01-26 | 2012-11-21 | 深圳市今朝时代新能源技术有限公司 | Motor speed closed loop control method |
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