CN1423409A - Motor control device and method thereof - Google Patents
Motor control device and method thereof Download PDFInfo
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- CN1423409A CN1423409A CN01140211A CN01140211A CN1423409A CN 1423409 A CN1423409 A CN 1423409A CN 01140211 A CN01140211 A CN 01140211A CN 01140211 A CN01140211 A CN 01140211A CN 1423409 A CN1423409 A CN 1423409A
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Abstract
This invention provides a multi-frequency pulse width modulation (PWM) DC motor rotational speed control device and method to alter traditional fixed frequency PWM control way and improve known noise including a detector electrically connecting to the said motor and the motor outputs a feedback signal to generate a first detection signal; and a controller connecting to the said detector and motor for receiving the said first detecting signal, when the said motor rotates at low speed, the said controller generates a first control signal with a first frequency outputted to the said motor, when it rotates at high speed, the controller generates a second signal with a second frequency to the motor, the first frequency of the first control signal is larger than the second frequency of the second control signal.
Description
Technical field
The present invention relates to a kind of controller for motor and method thereof, especially about a kind of d.c. motor controller, the pulse-width signal that it can the multistage different frequency is controlled motor speed.
Background technology
Because the chance that d.c. motor applies in the daily life increases gradually, functional requirement constantly changes, and singly not fixedly full-speed operation, thereby in order to control motor rotary speed, torsion, electric current and efficient thereof effectively, make the output of motor reach optimization, the d.c. motor controller is being played the part of important role.
Present employed d.c. motor controller control speed mode is all with fixing frequency, controls motor rotary speed via the ratio that changes wide " ON " and " OFF " than (duty cycle) of ripple, and the percentage of ON is bigger, motor rotary speed sooner, shown in Figure 1A; Opposite, the percentage of ON is healed little then motor rotary speed more slowly, and shown in Figure 1B, this is so-called pulse-width modulation (pulse width modulation, PWM) control.Yet, because the fixed-frequency of pulse-width signal, if frequency of utilization is on the low side, shown in Fig. 2 A, when low velocity, will produce the noise and the vibration of great motor magnetic switch,, and below 10kHz, be easy to recognize noise because of the mankind's auditory frequency range is 20Hz-20kHz.If when the frequency of pulse-width signal was higher fixed frequency, shown in Fig. 2 B, moyor was with variation; Moreover Yin Mada has coiling producing inductance, and inductance anti-be 2 π fL, frequency heals, and then inductance is anti-bigger and outputting torsion is littler for height, and the electronic component of controller also is easy to heating, thereby consumes many energy.
At the defective of known techniques, the inventor creates the present invention's " controller for motor and method thereof " through concentrated test and research.
Summary of the invention
Main purpose of the present invention is to provide a kind of controller for motor and method thereof, it is in pulse-width modulation (pulse width modulation, PWM) ripple is wide is in " ON " action of 0-100%, to control the speed of d.c. motor with the different ripple broadbands more than two sections or two sections than (duty cycle).
(Pulse widthmodulation, PWM) d.c. motor controller is with the defective that changes traditional fixed-frequency PWM control mode and improve the excessive and deterioration of efficiency of known noise to another object of the present invention is to provide a kind of multiple frequency type pulse-width modulation.
Realize that technical scheme of the present invention is as follows:
A kind of controller for motor, it comprises:
One detector is electrically connected on this motor, and a feedback signal of exporting in response to this motor and produce one first detection signal; And
One controller, be electrically connected on this detector and this motor, it is used to receive this first detection signal, when this motor turns round with the slow-speed of revolution, this controller produces one according to this first detection signal to have first control signal of first frequency and exports this motor to, when this motor during with high rotation speed operation, this controller produces one to have second control signal of second frequency and exports this motor to, and wherein the first frequency of this first control signal is greater than the second frequency of this second control signal.
Preferable, this motor is a direct current motor, and this detector can be a current sense device, in order to detecting flow through this motor electric current and produce this first detection signal.In addition, controller for motor more comprises a rotating speed detector, is electrically connected on this motor and this controller, and produces one second detection signal in response to the actual speed of this motor and export this second detection signal to this controller.
Perhaps, this detector is a rotating speed detector, and it produces this first detection signal and exports this first detection signal to this controller in response to the actual speed of this motor.
In addition, this controller is a pulse-width modulation (pulse width modulation, PWM) signal control circuit, wherein this pulse-width signal control circuit comprises a plurality of and lock (AND gate), to control the output of this first control signal or this second control signal.And this first control signal and this second control signal are respectively a pulse-width modulation (pulse width modulation, PWM) signal.
Preferable, the first frequency of this first control signal is more than the 10kHz.
A kind of motor rotation speed control method, it comprises:
A feedback signal of exporting in response to this motor and produce one first detection signal; And
Receive this first detection signal by a controller, when this motor turns round with the slow-speed of revolution, this controller produces one according to this first detection signal to have first control signal of first frequency and exports this motor to, when this motor during with high rotation speed operation, this controller produces one to have second control signal of second frequency and exports this motor to, and wherein the first frequency of this first control signal is greater than the second frequency of this second control signal.
In the said motor method for controlling number of revolution, this motor is a direct current motor; This controller is that (wherein this pulse-width signal control circuit comprises a plurality of and lock (AND gate), to control the output of this first control signal or this second control signal for pulse width modulation, PWM) signal control circuit in a pulse-width modulation; (wherein the first frequency of this first control signal is more than the 10kHz for Pulsewidthmodulation, PWM) signal and this first control signal and this second control signal are respectively a pulse-width modulation.
Multiple frequency type pulse-width modulation d.c. motor control of the present invention is except the function with general pulse-width modulation, frequency also changes with different behaviours in service, make d.c. motor output reach the optimum of high torsion, high efficiency and low noise, and then reach the purpose of saving the energy.
Description of drawings
Figure 1A is the waveform of the d.c. motor pwm signal that conventional P WM control circuit is exported when the slow-speed of revolution;
Figure 1B is the waveform of the d.c. motor pwm signal that conventional P WM control circuit is exported when high rotating speed;
Fig. 2 A and Fig. 2 B are respectively the waveform of the pwm signal of conventional P WM control circuit institute's output low frequency and high frequency;
Fig. 3 controls the situation of motor rotary speed with the pulse-width signal of multistage different frequency for explanation the present invention;
Fig. 4 is the calcspar of motor rotation speed control method of the present invention;
Fig. 5 is a preferred embodiment circuit diagram of controller for motor of the present invention;
Fig. 6 A and Fig. 6 B are respectively the detailed circuit diagram that PWM1 and PWM2 signal are provided in the circuit diagram of Fig. 5.
The main member of above accompanying drawing is as follows:
51: large current load district 511: motor
52: current sense device 53:PWM signal control circuit
531,532,533,534: and lock
Embodiment
Below in conjunction with accompanying drawing preferred embodiment is elaborated.
In a preferred embodiment of the present invention, the controller for motor that the present invention is used to control the d.c. motor rotating speed comprises a current sense device, and it is electrically connected on this motor and produces one first detection signal in response to the size of current of this motor of flowing through; An and controller, it is electrically connected on this current sense device and is used to receive this first detection signal with this motor, when this motor turns round with the slow-speed of revolution, this control element produces one according to this first detection signal to have first control signal of first frequency and exports this motor to, when this motor during with high rotation speed operation, this control element produces one to have second control signal of second frequency and exports this motor to, and wherein the first frequency of this first control signal is higher than the second frequency of this second control signal.
As for control principle of the present invention, see also Fig. 3.When motor runs up, except the percentage that electrorheological is reached increase the wide ON than (duty cycle) of ripple greatly, the frequency of PWM is reduced, make motor can effectively export bigger torsion, electronic component is unlikely to produce high temperature in that at a high speed big electric current is next; Opposite, when the motor low-speed running, electric current is diminished and outside the percentage of the wide ON than (duty cycle) of ripple diminished, the frequency that improves PWM made people's ear can't hear noise to more than the 10kHZ.
For proving absolutely and understand characteristic of the present invention, see also Fig. 4, it is the preferred embodiment calcspar of motor rotation speed control method of the present invention.At first, two direct voltage 24V and 12V are provided respectively, the former offers large current load control and uses, the latter then offers small-signal control and uses, if alternating voltage 220V and the 110V of providing, then need to handle, convert it to direct voltage 180V and 90V respectively with respectively for large current load and small-signal control use through a power supply.So-called large current load is meant the load of motor, and small-signal control is meant the control of pwm signal.Perhaps, direct voltage 24V and 12V also can directly be provided and need not handle through power supply, direct voltage 24V be offered revolution use, direct voltage 12V then is the reference voltage that offers the pwm signal control circuit.After flowing through the size of current of motor, detecting provide a detection signal to pwm signal control circuit 53, with the pwm signal of control and output different frequency, and then the rotating speed of control motor.
In addition, see also Fig. 5, it is a preferred embodiment circuit diagram of device for controlling motor rotational speed of the present invention.Provide a detection signal to this pwm signal control circuit 53 after utilizing current sense device 52 to detect the size of current of motor 511 in the large current load district 51 that flows through, by a plurality of and lock 531 in this pwm signal control circuit 53,532,533,534 decide the pwm signal of output different frequency.Therefore, the present invention controls the method for motor rotary speed, except can changing the wide ON percentage than (duty cycle) of electric current and ripple, also can change the frequency of pwm signal.In the circuit diagram of this embodiment, for the purpose of simplified illustration, with the pwm signal PWM1 of two different frequencies, PWM2 is an example, and Fig. 6 A and Fig. 6 B are respectively the detailed circuit diagram that PWM1 and PWM2 signal are provided.
Certainly, according to conception of the present invention, be not limited to above-mentioned two band frequencies control, also can be applicable to the multistage FREQUENCY CONTROL, and the electric current that multistage FREQUENCY CONTROL of the present invention is detected the motor of flowing through except above-mentioned utilization provides the feedback detection signal, also can provide detection signal by detecting motor actual speed, or while detecting current and actual speed.Multiple frequency type pulse-width modulation d.c. motor control of the present invention is except the function with general pulse-width modulation, frequency also changes with different behaviours in service, make d.c. motor output reach the optimum of high torsion, high efficiency and low noise, and then reach the purpose of saving the energy.
Therefore, the present invention must be by the various modifications of personage Ren Shi of being familiar with this skill, but it all should be within the scope of claim protection of the present invention.
Claims (15)
1. controller for motor, in order to the rotating speed of control motor, it is characterized in that: this controller for motor comprises:
One detector is electrically connected on this motor, and a feedback signal of exporting in response to this motor and produce one first detection signal; And
One controller, be electrically connected on this detector and this motor, it is used to receive this first detection signal, when this motor turns round with the slow-speed of revolution, this controller produces one according to this first detection signal to have first control signal of first frequency and exports this motor to, when this motor during with high rotation speed operation, this controller produces one to have second control signal of second frequency and exports this motor to, and wherein the first frequency of this first control signal is greater than the second frequency of this second control signal.
2. controller for motor as claimed in claim 1 is characterized in that: wherein this motor is a direct current motor.
3. controller for motor as claimed in claim 1 is characterized in that: wherein this detector is a current sense device, in order to detecting flow through this motor size of current and produce this first detection signal.
4. controller for motor as claimed in claim 3, it is characterized in that: it more comprises a rotating speed detector, be electrically connected on this motor and this controller, and produce one second detection signal in response to the actual speed of this motor and export this second detection signal to this controller.
5. controller for motor as claimed in claim 1 is characterized in that: wherein this detector is a rotating speed detector, and it produces this first detection signal and exports this first detection signal to this controller in response to the actual speed of this motor.
6. controller for motor as claimed in claim 1 is characterized in that: wherein this controller is a pulse-width modulation (pulse width modulation, a PWM) signal control circuit.
7. controller for motor as claimed in claim 6 is characterized in that: wherein this pulse-width signal control circuit comprises a plurality of and lock (AND gate), to control the output of this first control signal or this second control signal.
8. controller for motor as claimed in claim 6 is characterized in that: wherein this first control signal and this second control signal are respectively a pulse-width modulation (Pulse width modulation, PWM) signal.
9. controller for motor as claimed in claim 1 is characterized in that: wherein the first frequency of this first control signal is more than the 10kHz.
10. motor control method, in order to the rotating speed of control motor, it is characterized in that: this motor control method comprises:
A feedback signal of exporting in response to this motor and produce one first detection signal; And
Receive this first detection signal by a controller, when this motor turns round with the slow-speed of revolution, this controller produces one according to this first detection signal to have first control signal of first frequency and exports this motor to, when this motor during with high rotation speed operation, this controller produces one to have second control signal of second frequency and exports this motor to, and wherein the first frequency of this first control signal is greater than the second frequency of this second control signal.
11. motor control method as claimed in claim 10 is characterized in that: wherein this motor is a direct current motor.
12. motor control method as claimed in claim 10 is characterized in that: wherein this controller is a pulse-width modulation (pulse width modulation, a PWM) signal control circuit.
13. motor control method as claimed in claim 12 is characterized in that: wherein this pulse-width signal control circuit comprises a plurality of and lock (AND gate), to control the output of this first control signal or this second control signal.
14. motor control method as claimed in claim 12 is characterized in that: wherein this first control signal and this second control signal are respectively a pulse-width modulation (Pulse width modulation, PWM) signal.
15. motor control method as claimed in claim 10 is characterized in that: wherein the first frequency of this first control signal is more than the 10kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01140211A CN1423409A (en) | 2001-12-05 | 2001-12-05 | Motor control device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01140211A CN1423409A (en) | 2001-12-05 | 2001-12-05 | Motor control device and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1423409A true CN1423409A (en) | 2003-06-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01140211A Pending CN1423409A (en) | 2001-12-05 | 2001-12-05 | Motor control device and method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703666A (en) * | 2014-11-25 | 2016-06-22 | 建准电机工业股份有限公司 | Motor slow startup control system |
| US10581352B2 (en) | 2012-09-13 | 2020-03-03 | Moog Inc. | Method and apparatae for controlling and providing a voltage converter with a pulse-modulated switch |
-
2001
- 2001-12-05 CN CN01140211A patent/CN1423409A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10581352B2 (en) | 2012-09-13 | 2020-03-03 | Moog Inc. | Method and apparatae for controlling and providing a voltage converter with a pulse-modulated switch |
| CN105703666A (en) * | 2014-11-25 | 2016-06-22 | 建准电机工业股份有限公司 | Motor slow startup control system |
| CN105703666B (en) * | 2014-11-25 | 2018-07-13 | 建准电机工业股份有限公司 | Motor slow-start control system |
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