CN103973176B - Motor device and motor speed control system - Google Patents

Abstract

The invention discloses a motor device and a motor speed control system, which are coupled between a control device and the motor device by utilizing two power supply signal wires and a feedback/speed control signal wire, wherein the two power supply wires can electrically connect the control device and the motor device, and the feedback/speed control signal wire bidirectionally transmits signals from the control device and the motor device.

Description

Motor device and motor speed control system

This application is a divisional application of the application with the application date of November 16, 2007 and the application number 200710186726.9 entitled "Motor Device and Motor Speed Control System".

technical field

The invention relates to a motor device and a motor speed control system.

Background technique

A large number of signal lines with complex connections are usually coupled between the existing control motor device and the control device for controlling its rotation. For example, a common motor device (such as a brushless motor for driving a fan ) motor speed control system as shown in FIG. 1 , the positive power signal line 161 and the negative power signal line 162 are coupled between the control device 12 and the motor device 14 so that the control device 12 and the motor device 14 are electrically connected to each other. In addition, The speed control signal line 163 transmits the speed control signal generated by the control device 12 to the motor device 14, so that the processor (not shown) inside the motor device 14 can drive the motor device 14 to a specific speed according to the speed control signal of the control device 12. rotation, and the speed feedback signal line coupled between the control device 12 and the motor device 14 is used to transmit the feedback signal generated by the internal processor of the motor device 14 to the control device 12, so that the control device 12 can receive According to the received feedback signal, it is confirmed whether the rotational speed of the motor device 14 at each time sequence conforms to the rotational speed setting corresponding to the speed control signal at that time sequence.

It can be seen that, in order to accurately monitor the rotation of the motor device 14, at least four signal lines must be coupled between the motor device 14 and the control device 12 that controls its action, that is, the above-mentioned positive power signal line 161 and negative power signal line. 162. The speed control signal line 163 and the rotational speed feedback signal line 164, wherein the speed control signal line 163 and the rotational speed feedback signal line 164 are used to transmit signals from the control device 12 to the motor device 14 and from the motor device 14 to the control device 12 respectively That is to say, both the speed control signal line 163 and the speed feedback signal line 164 are signal lines for unidirectional transmission. However, the control signals between the control device 12 and the motor device 14 are not only the above-mentioned speed control signals and feedback signals, but also include drive signals, timing signals, etc. In order to transmit these signals, in actual applications, the control device 12 and the In addition to the above four signal lines, many signal lines are coupled between the motor devices 14 . Therefore, the overall circuit structure is not only quite complicated, but also has a negative impact on component costs, assembly man-hours, and device failure rates.

Therefore, how to simplify the control circuit of the rotating device without affecting the performance of the control has become one of the very important issues in the speed control technology.

Contents of the invention

In view of the above problems, the present invention provides a motor device and a motor speed control system, which utilizes a feedback/speed control signal line capable of bidirectionally transmitting signals to simplify the circuit design between the control device and the motor device. Both the speed control signal and the feedback signal from the motor device are transmitted through the same signal line, so the purpose of simplifying the circuit, reducing the cost and the failure rate of the device can be achieved.

In order to achieve the above purpose, a motor speed control system disclosed in the present invention firstly includes a control device, a motor device and a plurality of signal lines coupled between the control device and the motor device, wherein the signal lines include two power sources signal line and a feedback/speed control signal line; therefore, when the control device generates a speed control signal, it is transmitted to the motor device through the feedback/speed control signal line coupled between the control device and the motor device, and After the control circuit in the motor device receives the speed control signal, it drives the motor device to rotate correspondingly according to the speed control signal and generates a feedback signal at the same time, and then feeds the feedback signal to the controller through the feedback/speed control signal line In the device, the control device is used to judge whether the motor device operates normally according to the feedback signal.

In order to achieve the above purpose, according to a motor device disclosed in the present invention, it is electrically connected to a control device, and the motor device includes a control circuit and a plurality of signal lines, and the signal lines are coupled between the control circuit and the control device. Between the devices, it includes two power signal lines and a feedback/speed control signal line; wherein, the control device generates a speed control signal to control the rotation of the motor device, and the motor device generates a feedback signal after rotation to feed back into the control device , and the above-mentioned speed control signal and feedback signal are both transmitted through the feedback/speed control signal line with bidirectional transmission capability, wherein the speed control signal is a pulse signal, a pulse width modulation signal, or the pulse signal and the pulse An integrated signal of the width modulation signal, and the feedback signal is a rotational speed signal or a frequency signal of the motor device.

Based on the above, a motor device and a motor speed control system of the present invention utilize a signal line with bidirectional transmission capability to transmit signals from the control device and the motor device. Therefore, compared with the prior art, the motor device and the motor speed control system of the present invention not only have a relatively simplified circuit design, but the control device can still accurately control the rotation speed of the motor device, and the motor device can also execute the rotation speed control. Feedback to ensure that the motor can operate normally.

Description of drawings

FIG. 1 is a schematic block diagram of an existing motor speed control system;

Fig. 2 is a schematic block diagram of the motor speed control system of the present invention;

Fig. 3 is a schematic block diagram of a brushless motor applying the motor speed control system of the present invention; and

FIG. 4 is another block diagram of a brushless motor applying the motor speed control system of the present invention.

Description of reference symbols

12, 22: Control device 14, 24: Motor device

161: Positive power signal line 162: Negative power signal line

163: Speed control signal line 164: Feedback signal line

2: Motor speed control system 241: Control circuit

242: Rotating body 261: Positive power signal line

262: Negative power supply signal line 263: Feedback/speed control signal line

34: Brushless motor 341: Microprocessor

342: Fan 42: Diode

44: Capacitor 46: Switching element

521: high pass filter 522: low pass filter.

detailed description

A motor device and a motor speed control system according to preferred embodiments of the present invention will be described below with reference to related drawings, wherein the same components will be described with the same component symbols.

Please refer to FIG. 2, which is a schematic block diagram of a motor speed control system disclosed in the present invention. The motor speed control system 2 includes a control device 22, a motor device 24, and a device coupled to the control device 22 and the motor device 24. There is a positive power signal line 261 , a negative power signal line 262 and a feedback/speed control signal line 263 . Therefore, the control device 22 controls the motor device 24, and further enables the motor device 24 to drive the action of the rotating body 242 connected thereto. At the same time, the motor device 24 also feeds back the rotation state of the rotating body 242 to the control device 22, so that the control device 22 can simultaneously monitor the actions of the motor device 24 and the rotating body 242 .

In order to accurately control the rotational speed of the motor device 24, the control device 22 generates a speed control signal, and the rotated motor device 24 generates a corresponding feedback signal according to the state of rotation. Therefore, when the control device 22 generates the speed control signal, The speed control signal is transmitted to the control circuit 241 in the motor device 24 through the feedback/speed control signal line 263, and after the calculation of the control circuit 241, the motor device 24 is driven to rotate at a corresponding speed to drive the movement of the rotating body 242 , then, the control circuit 241 generates a corresponding feedback signal according to the actual rotational speed of the motor device 242 (or the frequency signal of the switching action of the rotating device, or the rotational speed signal converted from the frequency signal), and through the feedback/speed control The signal line 263 is fed back to the control device 22 , so the control device 22 can judge whether the motor device 24 operates at a correct rotational speed at a specific time sequence according to the received feedback signal.

Wherein, the speed control signal generated by the control device 22 can be a pulse signal generated by the control device 22 (such as a voltage signal or a voltage control signal), a pulse width modulation signal, or an integrated signal of the above pulse signal and the pulse width modulation signal. The motor device 24 can be a brushless motor, and the rotating body 242 connected with the motor device 24 can be a fan; and the feedback signal generated by the motor device 24 can be a rotational speed signal or a frequency signal of the motor device 24; It can be realized by its internal motor drive chip, microprocessor... and other control elements, and it can also be coupled between the control element and the feedback/speed control signal line through a switch element (not shown in this figure) .

In the following, two different implementations are proposed according to the motor device and the motor speed control system disclosed in the present invention, please refer to FIG. 3 and FIG. 4 respectively.

First please refer to Fig. 3, which is a brushless motor 34 of the present invention, which is connected to a fan 342 and drives the fan 342 to rotate, and the brushless motor 34 is connected by a positive power signal line 261, a The negative power signal line 262 and a feedback/speed control signal line 263 are coupled to a control device 22 . Wherein, the control device 22 generates a speed control signal for controlling the brushless motor 34 and transmits it to the brushless motor 34 through the feedback/speed control signal line 263, and the speed control signal in this embodiment is a voltage signal, when After the brushless motor 34 receives the speed control voltage signal, its internal control components, such as the motor driver IC or the microprocessor 341, calculate according to the relationship between the voltage signal and the driving voltage (for example: full Vcc). The corresponding rotating speed is obtained, and the calculated rotating speed is used to drive the brushless motor 34, thereby driving the fan 342 to rotate. At the same time, the microprocessor 341 detects the actual state of the brushless motor 34 through a phase detection circuit (not shown in the figure). The switching frequency (that is, the actual rotation speed of the fan 342 ) is used to generate a corresponding feedback signal (such as a frequency signal), and then the feedback signal is transmitted to the control device 22 through the feedback/speed control signal line 263 .

Although both the voltage signal and the feedback signal used for speed control are transmitted through the feedback/speed control signal line 263, since the transmission directions, properties and frequencies of the two signals are different, there will be no gap between the two signals. The interference of the brushless motor 34 will not affect the control efficiency of the control device 22 on the rotational speed of the brushless motor 34 or the accuracy of the relative rotational speed fed back by the brushless motor 34 .

In addition, the circuit structure adopted by the brushless motor 34 in this embodiment to generate the feedback signal is an open collector design, therefore, it includes a diode 42 and a capacitor 44, and one end of the diode 42 is coupled to In the feedback/speed control signal line 263, one end of the capacitor 44 is coupled to the other end of the diode 42 and then coupled to the microprocessor 341 in the brushless motor 34, and the other end of the capacitor 44 is grounded; and, the microprocessor The processor 341 is further coupled to a switch element 46 , wherein the switch element 46 may be a transistor. For example, in practical application, the switch element 46 may be but not limited to be an NPN bipolar junction transistor. However, the above-mentioned circuit structure is only one of the implementation methods of this embodiment, and it is not intended to limit the circuit design of the present invention in practical application, that is, any circuit structure equivalent or similar to the above-mentioned circuit design can be regarded as The scope covered by the present invention.

Please refer to FIG. 4 for continuation. It is also a brushless motor applying the present invention, which is similar to the implementation shown in FIG. A filtering unit is coupled between the brushless motor 34, wherein the filtering unit includes a high-pass filter 521 and a low-pass filter 522, and the high-pass filter 521 is integrated in the brushless motor 34 and its internal microprocessor 341, and the low-pass filter 522 is integrated in the control device 22.

The control device 22 generates a speed control signal for controlling the brushless motor 34 and transmits it to the brushless motor 34 through the feedback/speed control signal line 263, and the speed control signal in this embodiment is a pulse width with a relatively high frequency modulation signal, therefore, when the brushless motor 34 receives a high-frequency pulse width modulation signal, it first uses its internal high-pass filter 521 to filter out other lower-frequency signals before entering the microprocessor 341 , so that the microprocessor 341 can calculate the corresponding rotational speed according to the pulse width modulation signal, and use the calculated rotational speed to drive the brushless motor 34 to rotate and then drive the fan 342 to rotate. 34 the actual switching frequency to generate a corresponding feedback signal (for example: frequency signal) and transmit it through the feedback/speed control signal line 263, and compared with the pulse width modulation signal, the frequency of the feedback signal is higher than that of the pulse width modulation signal Therefore, the feedback signal from the brushless motor 34 can pass through the low-pass filter 522 to filter out other frequency noises before entering the control device 22 .

In addition, since the above two implementations are all applications of brushless motors, the phase signal sampling circuit used to convert the actual rotational speed of the brushless motor into a feedback signal can be a Hall sensor. Therefore, the Hall sensor can be used to The sensor first detects the switching frequency of the brushless motor, and then sends the detected switching frequency back to the control element of the control circuit in the brushless motor for calculation and conversion into a feedback signal that can be read by the control device. Since the detection and conversion method of this signal is an existing technology, it will not be repeated here.

According to the technical features disclosed above, it can be known that a motor device and a motor speed control system proposed by the present invention use a signal line with bidirectional transmission capability to transmit speed control signals and feedback signals, which simplifies the overall circuit structure and reduces the overall hardware cost. Expenses, reduced man-hours for assembly, and the probability of failure of a single component that leads to failure of the overall structure can be reduced due to the reduction of components.

The above descriptions are illustrative only, not restrictive. Any equivalent modification or change made without departing from the spirit and scope of the present invention shall be included in the patent scope of the present invention.

Claims (14)

1. a kind of motor control speed system, including：

One control device, produces a speed control signal；

One motor apparatus, it includes a control circuit, is used to produce a feedback signal；And

One feedback/speed control signal line, is coupled between the motor apparatus and the control device；

Wherein, the speed control signal is sent to the motor apparatus via the feedback/speed control signal line, and the feedback signal is anti-via this Feedback/speed control signal line is sent to the control device,

Wherein, the speed control signal is a pulse signal, a pulse width modulating signal, or the pulse signal and the pulse width are adjusted One integrated signal of signal processed, and the feedback signal is the tach signal or frequency signal of the motor apparatus,

Wherein the frequency of the feedback signal is less than the frequency of the speed control signal,

Wherein, the control circuit further includes a diode and a capacitor, the anode tap of the diode and the feedback/speed control signal Line is coupled, and the cathode terminal of the diode is coupled to a control element of the control circuit with one end coupling of the capacitor again, should The other end ground connection of capacitor, and the control circuit also includes a transistor, is coupled in the anode tap and ground of the diode Between.

2. motor control speed system as claimed in claim 1, wherein, the pulse signal is voltage signal or voltage control signal.

3. motor control speed system as claimed in claim 1, wherein, the motor apparatus are further included：

One phase signal sample circuit, all produced change phase signal when detecting that the motor apparatus are operated, and obtain correspondence A phase signal output；

Wherein the control circuit is coupled with the phase signal sample circuit, is used to receive the phase signal, and produce the feedback letter Number output.

4. motor control speed system as claimed in claim 1, wherein, the control circuit and the feedback/speed control signal line coupling are used To export the feedback signal.

5. the motor control speed system as described in claim 3 or 4, wherein, the control circuit includes：

Control element；And

One switch element, it is coupled with the control element and the feedback/speed control signal line.

6. motor control speed system as claimed in claim 5, wherein, the control element is that a motor drives IC or a microprocessor Device, the switch element is a transistor.

7. motor control speed system as claimed in claim 1, wherein, the control device has more one first filter element, the horse There is one second filter element, first filter element and second filter element and the feedback/speed control signal line coupling up to device Connect.

8. motor control speed system as claimed in claim 7, wherein, first filter element is a LPF element, and this Two filter elements are a high-pass filtering element.

9. a kind of motor apparatus, are electrically connected with a control device, and the motor apparatus include：

One control circuit, is used to produce a feedback signal to export；And

One feedback/speed control signal line, is coupled between the control circuit and the control device；

Wherein, the control device controls a speed control signal of the motor apparatus to be transmitted via the feedback/speed control signal line, and this is anti- Feedback signal is then sent to the control device via the feedback/speed control signal line,

Wherein, the speed control signal is a pulse signal, a pulse width modulating signal, or the pulse signal and the pulse width are adjusted One integrated signal of signal processed, and the feedback signal is the tach signal or frequency signal of the motor apparatus,

Wherein the frequency of the feedback signal is less than the frequency of the speed control signal,

Wherein the motor apparatus are further included：

One diode, its anode tap and the feedback/speed control signal line coupling；And

One capacitor, its one end is coupled to a control element of the control circuit, the electricity with the cathode terminal coupling of the diode again The other end ground connection of container；And

One transistor, is coupled between the anode tap of the diode and ground.

10. motor apparatus as claimed in claim 9, wherein, the pulse signal is voltage signal or voltage control signal.

11. motor apparatus as claimed in claim 9, wherein, the control circuit includes：

Control element；And

One switch element, it is coupled with the control element and the feedback/speed control signal line.

12. motor apparatus as claimed in claim 11, wherein, the control element is that a motor drives IC or a microprocessor, The switch element is the transistor.

13. motor apparatus as claimed in claim 9, wherein, the control device has more one first filter element, motor dress Put with more one second filter element, and first filter element and second filter element and the feedback/speed control signal line coupling Connect.

14. motor apparatus as claimed in claim 13, wherein, first filter element is a LPF element, and this second Filter element is a high-pass filtering element.