CN102570948A - Control system for direct current permanent magnetic brush motor - Google Patents
Control system for direct current permanent magnetic brush motor Download PDFInfo
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- CN102570948A CN102570948A CN2010105865635A CN201010586563A CN102570948A CN 102570948 A CN102570948 A CN 102570948A CN 2010105865635 A CN2010105865635 A CN 2010105865635A CN 201010586563 A CN201010586563 A CN 201010586563A CN 102570948 A CN102570948 A CN 102570948A
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- permanent magnet
- voltage
- control system
- magnet brush
- brush motor
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Abstract
The invention provides a control system for a direct current permanent magnetic brush motor. The control system comprises a direct current permanent magnetic brush motor, a direct current power supply, a speed given potentiometer, a pulse width modulator, an electronic power supply switch and a voltage sampling holder. The direct current power supply provides pulse voltage for the direct current permanent magnetic brush motor by the electronic power supply switch. The pulse width modulator generates pulse with fixed frequency for driving the electronic power supply switch. The voltage sampling holder collects counter electromotive force of the direct current permanent magnetic brush motor and compares the counter electromotive force with the voltage from the speed given potentiometer to obtain an error voltage. The error voltage is fed counter to the pulse width modulator to control the pulse width based on the error voltage. According to the control system for the direct current permanent magnetic brush motor disclosed by the invention, the counter electromotive force feedback technology of the direct current permanent magnetic brush motor is adopted in the control system. The speed of the direct current permanent magnetic brush motor is very stable because the speed of the motor is controlled by taking the sampled counter electromotive force of the direct current permanent magnetic brush motor as feedback signals.
Description
Technical field
The present invention relates to electric motors, relate in particular to a kind of DC permanent magnet brush electric machine control system.
Background technology
In the running of DC permanent magnet brush electric machine control system, because fluctuation, the load variations of input voltage make that the speed of motor is sometimes fast and sometimes slow, in order to overcome the influence of these extraneous factors; The input voltage of the general Direct Sampling DC permanent magnet brush of existing DC permanent magnet brush electric machine control system motor is as feedback signal, and then the speed of control motor, still; When motor load changed, the speed of motor was still unstable, especially at small voltage; Under the slow-revving situation, the load of motor increases the weight of, and the moment of motor diminishes; Rotating speed of motor is slack-off, more is difficult to reach the purpose of speed stabilizing.Therefore, a kind of real necessity that belongs to of DC permanent magnet brush electric machine control system with better speed stabilizing effect is provided.
Summary of the invention
The purpose of this invention is to provide a kind of DC permanent magnet brush electric machine control system, be intended to solve the existing unsettled technological deficiency of DC permanent magnet brush motor speed.
For realizing the foregoing invention purpose; DC permanent magnet brush electric machine control system provided by the invention comprises DC permanent magnet brush motor, DC power supply, velocity setting potentiometer, pulse width regulator, electronic power switch, voltage sample retainer; Said DC power supply provides pulse voltage through the electronic power switch to the DC permanent magnet brush motor; Said pulse width regulator produces the pulse of fixed frequency to drive the electronic power switch; Said voltage sample retainer is gathered the back electromotive force of DC permanent magnet brush motor; The voltage that itself and velocity setting potentiometer are provided compares, and the error voltage that draws feeds back to pulse width regulator and with this control impuls width.
Further, said electronic switch adopts FET.
Further, said DC permanent magnet brush electric machine control system comprises that also closes the fly-wheel diode have no progeny to the inductance afterflow of DC permanent magnet brush motor at the electronic power switch.
Further, said DC permanent magnet brush electric machine control system also comprises an error comparator, and the back electromotive force of the DC permanent magnet brush motor that said error comparator is collected the voltage sample retainer and the voltage that the velocity setting potentiometer provides compare.
Further, said error comparator is integrated in the pulse width regulator.
Further, said DC permanent magnet brush electric machine control system also comprises the feedback voltage sampling switch that the said voltage sample retainer of a control is sampled, and said feedback voltage sampling switch and electronic power switch keep opposite operating state.
Than prior art; DC permanent magnet brush electric machine control system provided by the invention adopts DC permanent magnet brush winding back emf feedback technique; Control the speed of motor as feedback signal through the back electromotive force of sampling DC permanent magnet brush motor; The voltage that electronic switch sampling motor through at a high speed sends, the voltage that this samples out and velocity setting voltage compare, and its error of usefulness goes to control opening and turn-offing of electronic power switch; Carry out the control of speed, make that the speed of DC permanent magnet brush motor is highly stable.
Description of drawings
Fig. 1 is the structural representation of preferred embodiment DC permanent magnet brush electric machine control system of the present invention.
Fig. 2 is the physical circuit sketch map of preferred embodiment DC permanent magnet brush electric machine control system of the present invention.
Fig. 3 is a voltage relationship sketch map involved in the present invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Referring to shown in Figure 1, the DC permanent magnet brush electric machine control system that preferred embodiment of the present invention provides comprises DC power supply 1, velocity setting potentiometer 2, error comparator 3, pulse width regulator 4, voltage sample switch 5, electronic power switch 6, DC permanent magnet brush motor 7, fly-wheel diode 8, voltage sample retainer 9.
Pulse width regulator 4 produces the pulse of fixed frequency to drive electronic power switch 6 (typical, electronic switch 6 can adopt FET), and DC power supply 1 provides pulse voltage through electronic power switch 6 to DC permanent magnet brush motor 7.Electronic power switch 6 keeps opposite operating state with voltage sample switch 5, that is, when 6 conductings of electronic power switch, voltage sample switch 5 turn-offs; When electronic power switch 6 turn-offs; 5 conductings of voltage sample switch, this moment is through the back electromotive force of voltage sample retainer 9 collection DC permanent magnet brush motors 7, as the sign amount of DC permanent magnet brush motor 7 rotating speeds; This sign amount is delivered to error comparator 3; The voltage that provides with velocity setting potentiometer 2 compares, and the error voltage that draws feeds back to pulse width regulator 4, with the control impuls width; So just control the conducting and the turn-off time of electronic power switch 6, reached the purpose that speed feedback is regulated.Fly-wheel diode 8 helps out, and its effect is to close at electronic power switch 6 to have no progeny, and is the inductance afterflow of DC permanent magnet brush motor 7.
In conjunction with referring to shown in Fig. 2, Fig. 3; Fig. 2 has provided a kind of physical circuit execution mode of electrical block diagram among Fig. 1; Circuit shown in wherein in the frame of broken lines is the physical circuit implementation of each components and parts among Fig. 1; Because the implementation of these components and parts belongs to the category of prior art, does not give unnecessary details one by one at this.The working method of circuit is following among Fig. 2: in the circuit module of DC power supply 1, step-down is 30V to the 510V alternating voltage through DC chopper, and pulse width regulator 4 output driving pulses are with the conducting and the shutoff of control electronic power switch.At electronic power switch 6 conduction periods (t1 as shown in Figure 3); The output voltage of DC power supply 1 gives the DC permanent magnet brush motor 7 power supplies through electronic power switch 6, in electronic power switch 6 off periods (t3 as shown in Figure 3), 5 conductings of voltage sample switch; The back-emf of voltage sample device 9 sampling DC permanent magnet brush motors 7; Deliver in the sampling holder 9 through voltage sample switch 5, the voltage in the voltage sample retainer 9 (like Fig. 3) compares (in the present embodiment, error comparator 3 is integrated in the pulse width regulator 4) with the given voltage of velocity setting potentiometer 2 in error comparator 3; The error voltage that draws feeds back to pulse width regulator 4; With the control impuls width, so just controlled the conducting and the turn-off time of electronic power switch 6, reach the purpose that speed feedback is regulated.Fly-wheel diode 8 helps out, and its effect is to close at electronic power switch 6 to have no progeny, and is the inductance afterflow (t2 as shown in Figure 3) of DC permanent magnet brush motor 7.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. DC permanent magnet brush electric machine control system; It comprises the DC permanent magnet brush motor; Be characterised in that further and comprise: DC power supply, velocity setting potentiometer, pulse width regulator, electronic power switch, voltage sample retainer; Said DC power supply provides pulse voltage through the electronic power switch to the DC permanent magnet brush motor; Said pulse width regulator produces the pulse of fixed frequency to drive the electronic power switch; Said voltage sample retainer is gathered the back electromotive force of DC permanent magnet brush motor, and the voltage that itself and velocity setting potentiometer are provided compares, and the error voltage that draws feeds back to pulse width regulator and with this control impuls width.
2. DC permanent magnet brush electric machine control system according to claim 1 is characterized in that: said electronic switch adopts FET.
3. DC permanent magnet brush electric machine control system according to claim 1 is characterized in that: comprise that further closes the fly-wheel diode have no progeny to the inductance afterflow of DC permanent magnet brush motor at the electronic power switch.
4. DC permanent magnet brush electric machine control system according to claim 1; It is characterized in that: further comprise an error comparator, the back electromotive force of the DC permanent magnet brush motor that said error comparator is collected the voltage sample retainer and the voltage that the velocity setting potentiometer provides compare.
5. DC permanent magnet brush electric machine control system according to claim 4 is characterized in that: said error comparator is integrated in the pulse width regulator.
6. DC permanent magnet brush electric machine control system according to claim 1; It is characterized in that: further comprise the feedback voltage sampling switch that the said voltage sample retainer of a control is sampled, said feedback voltage sampling switch and electronic power switch keep opposite operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105865635A CN102570948A (en) | 2010-12-14 | 2010-12-14 | Control system for direct current permanent magnetic brush motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105865635A CN102570948A (en) | 2010-12-14 | 2010-12-14 | Control system for direct current permanent magnetic brush motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102570948A true CN102570948A (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105865635A Pending CN102570948A (en) | 2010-12-14 | 2010-12-14 | Control system for direct current permanent magnetic brush motor |
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| CN (1) | CN102570948A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257217A (en) * | 2017-08-15 | 2017-10-17 | 昆山华恒焊接股份有限公司 | A kind of direct current generator feedback driving circuit and method |
| CN111786602A (en) * | 2020-07-21 | 2020-10-16 | 常州九圣焊割设备股份有限公司 | Constant-speed control method for direct-current permanent magnet brush motor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4409527A (en) * | 1979-07-03 | 1983-10-11 | Sommeria Marcel R | Transistor motor control |
| CN1848659A (en) * | 2005-04-13 | 2006-10-18 | 台达电子工业股份有限公司 | Control method and control circuit for brushless DC motor |
| CN200980059Y (en) * | 2006-11-23 | 2007-11-21 | 杨文宏 | A direct current motor speed controller of a pulse speed regulation type |
| CN101098118A (en) * | 2007-06-13 | 2008-01-02 | 邱光 | Rotation velocity control method and circuit of DC dragging system |
| CN101394147A (en) * | 2008-09-12 | 2009-03-25 | 江苏科技大学 | DC motor speed control device and method |
-
2010
- 2010-12-14 CN CN2010105865635A patent/CN102570948A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4409527A (en) * | 1979-07-03 | 1983-10-11 | Sommeria Marcel R | Transistor motor control |
| CN1848659A (en) * | 2005-04-13 | 2006-10-18 | 台达电子工业股份有限公司 | Control method and control circuit for brushless DC motor |
| CN200980059Y (en) * | 2006-11-23 | 2007-11-21 | 杨文宏 | A direct current motor speed controller of a pulse speed regulation type |
| CN101098118A (en) * | 2007-06-13 | 2008-01-02 | 邱光 | Rotation velocity control method and circuit of DC dragging system |
| CN101394147A (en) * | 2008-09-12 | 2009-03-25 | 江苏科技大学 | DC motor speed control device and method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257217A (en) * | 2017-08-15 | 2017-10-17 | 昆山华恒焊接股份有限公司 | A kind of direct current generator feedback driving circuit and method |
| CN111786602A (en) * | 2020-07-21 | 2020-10-16 | 常州九圣焊割设备股份有限公司 | Constant-speed control method for direct-current permanent magnet brush motor |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120711 |