TWI612766B - Motor control system - Google Patents

Abstract

A motor control system is applicable to a motor device. When the controller is operated in a stop mode, the controller controls any one of the switches in the first switch module to be turned on, and the first switch module is in the first The switch of the switch module has no electrical connection relationship, and is switched to be turned on, and the other switches are not turned on, so that the motor device stops.

Description

Motor control system

The present invention relates to a controller, and more particularly to a motor control system.

Three-phase motor control, when used in industrial control, generally, the control of the motor is to control the operation of the motor by controlling the conduction of the power component using a three-phase waveform.

The basic structure of the three-phase motor control circuit includes the controller and the power stage as shown in Figure 1. The power stage has six power components, and the controller controls the three-phase voltage of the three-phase motor by controlling the conduction state of the six power components. Power components: IGBT, MOSFET or BJT. In order to control the brake of the motor, it is necessary to properly control the conduction of the power component. However, when the motor brakes, the power component may overflow and cause damage. Therefore, in order to prevent the current flowing through the power component from being too large, the power component is damaged. Generally, a current sensor is added to detect the current, and the controller obtains current information through the current sensor to determine how to adjust the six power components. The conduction state is for the purpose of reducing the current flowing through the power component. However, there are many types of current sensors in general motor control systems. Generally, the current sensors used need to use three current sensors. However, three current sensors are used. Both have to waste the cost of three current sensors, which greatly increases the cost of the brushless motor control system.

Referring to FIG. 2, a motor control system architecture diagram, when the first switch P1, the third switch P3, and the fifth switch P5 are switched to be non-conductive, and the second switch P2, the fourth switch P4, and the sixth Switch P6 is conducting. At this time, the paths IA, IB, and IC form a loop, and current flows through the motor to brake the motor.

Therefore, how to reduce the cost of the brushless motor control system has become the direction that many manufacturers have to work hard.

Therefore, an object of the present invention is to provide a motor control system suitable for use with a first voltage source, a second voltage source, and a first input terminal, a second input terminal, and a third input terminal. The motor device is electrically connected, comprising: a current sensor electrically connected to the first voltage source; a first switch module comprising a first switch, a third switch, and a fifth switch, and the first One end of the switch, the third switch, and the fifth switch are electrically connected to the other end of the current sensor; a second switch module includes a second switch, a fourth switch, and a sixth switch, One end of the second switch is electrically connected to the other end of the first switch, the first input end of the motor device, and one end of the fourth switch is electrically connected to the other end of the third switch and the second input end of the motor device One end of the sixth switch is electrically connected to the other end of the fifth switch, the third input end of the motor device, and the other end of the second switch, the fourth switch, and the sixth switch is connected to the second voltage source Electrical connection; and a controller with six a control terminal that individually connects the first switch, the third switch, the fifth switch, the second switch, the fourth switch, and the sixth switch; wherein, when the controller operates in a stop mode, the controller controls The switch of the first switch module is switched to be turned on, and the switch of the second switch module that is not electrically connected to the turn-on switch of the first switch module is switched to be turned on, and the remaining switches are not turned on, and The motor device is stopped.

Further, another object of the present invention is a motor control system The system is electrically connected to a first voltage source, a second voltage source, and a motor device having a first input end, a second input end, and a third input end, and includes: a current sensor, and The first voltage source is electrically connected to the first switch module, and includes a first switch, a third switch, and a fifth switch, and one of the first switch, the third switch, and the fifth switch The other end of the current sensor is electrically connected; a second switch module includes a second switch, a fourth switch, and a sixth switch, and one end of the second switch and the other end of the first switch, The first input end of the motor device is electrically connected, one end of the fourth switch is electrically connected to the other end of the third switch, the second input end of the motor device, and the other end of the sixth switch and the fifth switch One end, the third input end of the motor device is electrically connected, and the other ends of the second switch, the fourth switch, and the sixth switch are electrically connected to the second voltage source; and a controller has six control ends, Individually connecting the first switch, the third switch, and the fifth switch And a control end of the second switch, the fourth switch, and the sixth switch; wherein, when the controller is operated in a stop mode, any two switches of the first switch module are switched to be turned on, and the second switch module is The switch having no electrical connection relationship with the conduction switch of the first switch module is switched to be turned on, and the remaining switches are not turned on, so that the motor device is stopped.

In addition, in another object of the present invention, a motor control system is applicable to a first voltage source, a second voltage source, and a motor having a first input terminal, a second input terminal, and a third input terminal. The device is electrically connected, comprising: a current sensor electrically connected to the second voltage source; a first switch module comprising a first switch, a third switch, and a fifth switch, and the first switch One of the third switch and the fifth switch is electrically connected to the first voltage source; a second switch module includes a second switch, a fourth switch, and a sixth switch, the second switch One end is electrically connected to the other end of the first switch, the first input end of the motor device, and one end of the fourth switch is electrically connected to the other end of the third switch and the second input end of the motor device, the sixth One end of the switch and the other of the fifth switch The third input end of the motor device is electrically connected, and the other end of the second switch, the fourth switch, and the sixth switch are electrically connected to the other end of the current sensor; and a controller has six a control terminal that individually connects the control ends of the first switch, the third switch, the fifth switch, the second switch, the fourth switch, and the sixth switch; wherein, when the controller operates in a stop mode, the controller controls The switch of the first switch module is switched to be turned on, and the switch of the second switch module that is not electrically connected to the turn-on switch of the first switch module is switched to be turned on, and the remaining switches are not turned on, and The motor device is stopped.

In addition, another object of the present invention is a motor control system, which is applicable to a first voltage source, a second voltage source, and a motor having a first input terminal, a second input terminal, and a third input terminal. The device is electrically connected, comprising: a current sensor electrically connected to the second voltage source; a first switch module comprising a first switch, a third switch, and a fifth switch, and the first switch One of the third switch and the fifth switch is electrically connected to the first voltage source; a second switch module includes a second switch, a fourth switch, and a sixth switch, the second switch One end is electrically connected to the other end of the first switch, the first input end of the motor device, and one end of the fourth switch is electrically connected to the other end of the third switch and the second input end of the motor device, the sixth One end of the switch is electrically connected to the other end of the fifth switch, the third input end of the motor device, and the other end of the second switch, the fourth switch, and the sixth switch is electrically connected to the other end of the current sensor Connection; and a controller with six controls Individually connecting the control ends of the first switch, the third switch, the fifth switch, the second switch, the fourth switch, and the sixth switch; wherein, when the controller operates in a stop mode, the controller controls the first Any switch in the switch module is switched to be turned on, and the switch in the second switch module that is not electrically connected to the turn-on switch of the first switch module is switched to be turned on, and the remaining switches are not turned on, so that the switch The motor unit stops.

Thus, the effect of the present invention is to provide a low-cost motor drive control system that can control the brake of the motor using only one current sensor, so that the cost of the motor drive control system is greatly reduced.

[this creation]

10‧‧‧ Controller

20‧‧‧First switch module

30‧‧‧Second switch module

40‧‧‧current sensor

P1‧‧‧ first switch

P2‧‧‧ second switch

P3‧‧‧ third switch

P4‧‧‧fourth switch

P5‧‧‧ fifth switch

P6‧‧‧ sixth switch

50‧‧‧Motor unit

1 is a schematic diagram of a conventional three-phase motor control system; FIG. 2 is a schematic view of a conventional motor control brake; FIG. 3 is a first schematic view of the driving current sensor arrangement of the present invention: FIG. Figure 5 is a second schematic view of the drive current sensor arrangement of the present invention: and Figure 6 is a second schematic view of the motor current control of the present invention.

The details of the related patents and the technical contents of the present invention will be apparent from the following detailed description of the preferred embodiments of the accompanying drawings.

Referring to FIG. 3, a first preferred embodiment of the present invention is applicable to a first voltage source VM, a second voltage source GND, and a first input terminal VA and a second input terminal. The motor unit 50 of the VB and the third input terminal VC is electrically connected, and includes: a current sensor 40, a first switch module 20, and a second switch module 30, wherein the first switch module 10 includes a first switch P1, a third switch P3, and a fifth switch P5. The second switch module 20 includes a second switch P2, a fourth switch P4, and a sixth switch P6.

The first switch P1 has three ends, the second switch P2 has three ends, the third switch P3 has three ends, the fourth switch P4 has three ends, the fourth switch P4 has three ends, the fifth switch P5 has three ends, and the sixth switch P5 has three ends. .

A controller 10 has six control terminals, which are a first control terminal, a second control terminal, a third control terminal, a fourth control terminal, a fifth control terminal, and a sixth control terminal. The detailed connection is as follows: the first control end of the controller Connecting the control end of the first switch, the second control end of the controller is connected to the control end of the second switch, the third control end of the controller is connected to the control end of the third switch, and the fourth control end of the controller is connected The control end of the fourth switch is connected to the control end of the fifth switch, and the sixth control end of the controller is connected to the control end of the sixth switch.

One end of the current sensor 40 is electrically connected to the first voltage source VM, and the other end is electrically connected to one end of the first switch P1, the third switch P3, and the fifth switch P5, and the other end of the first switch P1 One end is electrically connected to one end of the second switch P2, the first input end VA of the motor device 50, and the other end of the third switch P3 is electrically connected to the fourth switch P4 and the second input end VB of the motor device 50. The other end of the fifth switch P5 is electrically connected to one end of the sixth switch P6 and the third input end VC of the motor device 50. The second switch P2, the fourth switch P4, and the sixth switch P6 are One end is electrically connected to the second voltage source GND.

The controller 10 is connected to the current sensor 40. When the controller 10 senses that the current of the current sensor 40 is excessive, the first switch module 20 and the second switch module 30 can be The switch does not turn on.

When the controller 10 is operated in a stop mode, the controller 10 controls any one of the first switch modules 20 to be turned on, and the second switch module and the first switch module 30 The switch of the conduction switch having no electrical connection relationship is switched to be turned on, and the remaining switches are not turned on, so that the motor device 50 is stopped.

When the motor control system is in normal operation, the controller 10 is operable in a first stop mode, a second stop mode, a third stop mode, a fourth stop mode, a fifth stop mode, and a sixth stop. Mode, and a normal mode. The first stop mode, the second stop mode, the third stop mode, the fourth stop mode, the fifth stop mode, and the sixth stop mode are brake modes.

When the controller 10 operates in the first stop mode, the first A switch P1, the fourth switch P4, and the sixth switch P6 are switched to be turned on, and the second switch P2, the third switch P3, and the fifth switch P5 are non-conductive.

Here, the current circuit in the first stop mode of FIG. 4 will be described. At this time, the current loop of IB flows through the fourth switch P4, the second input terminal VB of the motor device 50, and flows through the motor device 50. The third input terminal VC is further connected to the sixth switch P6. The current path IC of the current sensor 40 is, by the second voltage source (GND), the ground terminal flows through the sixth switch P6, the third input terminal VC end of the motor device 50, and is first by the motor device 50. The input terminal VA is discharged, and then flows through the current sensor 40 to the first voltage source VM via the first switch P1.

Similarly, the current paths of a second stop mode, a third stop mode, a fourth stop mode, a fifth stop mode, and a sixth stop mode are not described herein.

When operating in the second stop mode, the second switch P2, the third switch P3, and the sixth switch P6 are switched to be turned on, and the first switch P1, the fourth switch P4, and the fifth switch P5 are Not conductive.

When operating in the third stop mode, the second switch P2, the fourth switch P4, and the fifth switch P5 are switched to be turned on, and the first switch P1, the third switch P3, and the sixth switch P6 are Not conductive.

When the controller 10 is operated in a fourth stop mode, a fifth stop mode, and a sixth stop mode, the controller 10 controls any two switches in the first switch module 20 to be turned on, and the controller The switch in the second switch module 30 that is not electrically connected to the conduction switch of the first switch module 20 is switched to be turned on, and the remaining switches are not turned on, so that the motor device 50 is stopped.

The first switch P1, the third switch P3, and the sixth switch P6 are switched to be turned on, and the second switch P2, the fourth switch P4, and the fifth switch are operated when the fourth stop mode is operated. P5 is not conductive.

When operating in the fifth stop mode, the first switch P1, the fifth switch P5, and the fourth switch P4 are switched to be turned on, and the second switch P2, the third switch P3, and the sixth switch P6 are Turn on.

When operating in the sixth stop mode, the second switch P2, the third switch P3, and the fifth switch P5 are switched to be turned on, and the first switch P1, the fourth switch P4, and the sixth switch P6 are Not conductive.

The invention controls the motor by forming two switches of the upper arm, one switch of the lower arm, one switch of the upper arm, one switch of the upper arm, and two switches of the lower arm to stop the motor, and only uses a current detector to detect the current. It is the purpose of the invention. There are six switches in the present invention, and the switching action of the present invention is that the switches that are not electrically connected are mutually exclusive.

The invention can control the conduction of one switch in the first switch module 20 by using different operation modes, and simultaneously turn on the two switches in the second switch module 30, so that the motor can brake and detect the current of the motor. . Similarly, the two switches in the first switch module 20 can be controlled to be turned on, and at the same time, the switch in the second switch module 30 is turned on, so that the motor can brake and detect the current of the motor.

When the controller 10 is connected to the current sensor 40 and detects that the current of the current sensor 40 exceeds a predetermined value, the first switch module 20 and the switch in the second switch module 30 are enabled. All are not conductive.

Second preferred embodiment:

Referring to FIG. 5, a second preferred embodiment of the present invention is applicable to a first voltage source VM, a second voltage source GND, and a first input terminal VA and a second input terminal VB. The motor unit 50 of the third input terminal VC is electrically connected, and includes: a current sensor 40, a first switch module 20, and a second switch module 30, wherein the first switch module 20 The first switch P1, the third switch P3, and the fifth switch P5 are included. The second switch module 30 includes a second switch P2, a fourth switch P4, and a sixth switch P6.

One end of the current sensor 40 is electrically connected to the second voltage source GND, and the other end is electrically connected to one end of the second switch P2, the fourth switch P4, and the sixth switch P6, and the first switch P1 is another One end is electrically connected to one end of the second switch P2, the first input end VA of the motor device 50, and the other end of the third switch P3 is electrically connected to the fourth switch P4 and the second input end VB of the motor device 50. The other end of the fifth switch P5 is electrically connected to one end of the sixth switch P6 and the third input end VC of the motor device 50. The first switch P1, the third switch P3, and the fifth switch P5 are One end is electrically connected to the first voltage source VM.

The motor control system 10 is operable in a first stop mode, a second stop mode, a third stop mode, a fourth stop mode, a fifth stop mode, a sixth stop mode, and a normal mode.

When operating in the first stop mode, the first switch P1, the fourth switch P4, and the sixth switch P6 are switched to be turned on, and the second switch P2, the third switch P3, and the fifth switch P5 are Not conductive.

Here, a description will be given of a circuit for describing the first stop mode current using FIG. 6. At this time, the current loop of the IB flows through the fourth switch P4, the second input terminal VB of the motor device 50, and flows through the motor. The third input terminal VC of the device 50 is further connected to the sixth switch P6. The current path IC of the current sensor 40 is, by the second voltage source (GND), the ground terminal, the current sensor 40, the sixth switch P6, the third input end of the motor device 50, and The first input terminal VA of the motor device 50 flows out, and then passes through the first switch P1 to the first voltage source VM.

Similarly, the current paths of a second stop mode, a third stop mode, a fourth stop mode, a fifth stop mode, and a sixth stop mode of FIG. 6 are used, and thus no further details are provided herein.

When operating in the second stop mode, the second switch P2, the third switch P3, and the sixth switch P6 are switched to be turned on, and the first switch P1, the fourth switch P4, and the fifth switch P5 are Not conductive.

When operating in the third stop mode, the second switch P2, the fourth switch P4, and the fifth switch P5 are switched to be turned on, and the first switch P1, the third switch P3, and the sixth switch P6 are Not conductive.

The first switch P1, the third switch P3, and the sixth switch P6 are switched to be turned on, and the second switch P2, the fourth switch P4, and the fifth switch are operated when the fourth stop mode is operated. P5 is not conductive.

When operating in the fifth stop mode, the first switch P1, the fifth switch P5, and the fourth switch P4 are switched to be turned on, and the second switch P2, the third switch P3, and the sixth switch P6 are Turn on.

When operating in the sixth stop mode, the second switch P2, the third switch P3, and the fifth switch P5 are switched to be turned on, and the first switch P1, the fourth switch P4, and the sixth switch P6 are Not conductive.

When the controller 10 detects that the current of the current sensor 40 exceeds a predetermined value, the switches in the first switch module 20 and the second switch module 30 are all non-conductive.

When the controller 10 controls the switches of the first switch module 20 and the second switch module 30 to adopt a pulse width modulation wave technique to strengthen the braking force of the motor device 50, it is an increased time constant. To strengthen or control the braking force of the motor.

」、P4=「ON」、P6=「ON」。 When using the PWM control mode, in the first stop mode, the first switch P1, the second switch P2, the third switch P3, the fourth switch P4, the fourth switch P4, the fifth switch P5, and the sixth switch P6 change as follows , P1 = "PWM", P3 = "OFF", P5 = "OFF", P2 = "

", P4 = "ON", P6 = "ON".

」、P6=「ON」。P1=「OFF」、P3=「OFF」、P5=「PWM」、P2=「ON」、P4=「ON」、P6=「

」，所以於此不加以贅述。 Other modes are P1=“OFF”, P3=“PWM”, P5=“OFF”, P2=“ON”, P4=”

", P6 = "ON". P1=“OFF”, P3=“OFF”, P5=“PWM”, P2=“ON”, P4=“ON”, P6=”

Therefore, I will not repeat them here.

脈波寬度 調變波為互斥，意即，PWM為導通時，

為不導通時，又或者，PWM為不導通，

為導通時。 Among them, PWM pulse width modulation wave and

The pulse width modulation wave is mutually exclusive, that is, when the PWM is turned on,

When it is not conducting, or if PWM is not conducting,

When turned on.

The object of the present invention is to provide a low-cost motor drive control system, which can detect the current when the motor is braked by using only one current sensor, so that when the brake current of the motor is too large, the first switch mode can also be made. The switches in the group 20 and the second switch module 30 are all non-conducting, and the current of the motor is not excessively large and the switch is burned, so that the cost of the motor drive control system is greatly reduced.

In summary, the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

10‧‧‧ Controller

20‧‧‧First switch module

30‧‧‧Second switch module

40‧‧‧current sensor

50‧‧‧Motor unit

Claims (4)

A motor control system is configured to be electrically connected to a first voltage source, a second voltage source, and a motor device having a first input end, a second input end, and a third input end, including: a sense of current The first switch module includes a first switch, a third switch, and a fifth switch, and the first switch, the third switch, and the fifth switch One end of the switch is electrically connected to the other end of the current sensor; a second switch module includes a second switch, a fourth switch, and a sixth switch, and one end of the second switch and the first switch The other end of the motor device is electrically connected to the first input end of the motor device, and the other end of the fourth switch is electrically connected to the other end of the third switch, the second input end of the motor device, and the first end of the sixth switch The other end of the five switches is electrically connected to the third input end of the motor device, and the other ends of the second switch, the fourth switch, and the sixth switch are electrically connected to the second voltage source; and a controller has six Control terminals, individually connected to the first switch, a control terminal of the third switch, the fifth switch, the second switch, the fourth switch, and the sixth switch; wherein, when the controller is operated in a stop mode, the controller controls switching of any one of the first switch modules The switch is turned on, and the switch in the second switch module that is not electrically connected to the turn-on switch of the first switch module is switched to be turned on, and the remaining switches are not turned on, so that the motor device is stopped. The motor control system of claim 1, wherein the stop mode comprises a first stop mode, a second stop mode, and a a third stop mode, when the first stop mode is operated, the first switch, the fourth switch, and the sixth switch are switched on, and the second switch, the third switch, and the fifth switch are not Turning on; when operating in the second stop mode, the second switch, the third switch, and the sixth switch are switched to be on, and the first switch, the fourth switch, and the fifth switch are non-conducting; When operating in the third stop mode, the second switch, the fourth switch, and the fifth switch are switched on, and the first switch, the third switch, and the sixth switch are non-conductive. A motor control system is configured to be electrically connected to a first voltage source, a second voltage source, and a motor device having a first input end, a second input end, and a third input end, including: a sense of current The first switch module includes a first switch, a third switch, and a fifth switch, and the first switch, the third switch, and the fifth switch One end of the switch is electrically connected to the other end of the current sensor; a second switch module includes a second switch, a fourth switch, and a sixth switch, and one end of the second switch and the first switch The other end of the motor device is electrically connected to the first input end of the motor device, and the other end of the fourth switch is electrically connected to the other end of the third switch, the second input end of the motor device, and the first end of the sixth switch The other end of the five switches is electrically connected to the third input end of the motor device, and the other ends of the second switch, the fourth switch, and the sixth switch are electrically connected to the second voltage source; and a controller has six Control terminals, individually connected to the first switch, Third switching control terminal of the fifth switch, the second switch, the fourth switch and the sixth switch; The controller controls the switch of the first switch module to be turned on when the controller is operated in a stop mode, and the conductive switch of the second switch module and the first switch module are not powered. The switch of the connection relationship is switched to be turned on, and the remaining switches are not turned on, so that the motor device is stopped. The motor control system of claim 3, wherein the stop mode includes a fourth stop mode, a fifth stop mode, and a sixth stop mode, when operating in the fourth stop mode, the a switch, the third switch, the sixth switch are switched to be on, and the second switch, the fourth switch, and the fifth switch are non-conducting; when operating in the fifth stop mode, the first switch, The fifth switch and the fourth switch are switched on, and the second switch, the third switch, and the sixth switch are turned on; when operating in the sixth stop mode, the second switch, the third switch The fifth switch is switched on, and the first switch, the fourth switch, and the sixth switch are non-conductive.