WO2015161530A1

WO2015161530A1 - Fault state feedback method for bldc motor and application of bldc motor and air-conditioning system

Info

Publication number: WO2015161530A1
Application number: PCT/CN2014/077012
Authority: WO
Inventors: 孙海荣
Original assignee: 中山大洋电机股份有限公司
Priority date: 2014-04-25
Filing date: 2014-05-08
Publication date: 2015-10-29
Also published as: CN105024592B; CN105024592A

Abstract

Disclosed are a fault state feedback method for a BLDC motor, an application of the BLDC motor, and an air-conditioning system. The BLDC motor is provided with a feedback port FG that outputs a motor rotating speed signal outwards, the FG outputting a PWM signal. The method is characterized in that: when the port FG outputs the motor rotating speed signal outwards, the frequency of the signal is defined in a first frequency band, and within the range of the first frequency band, the frequency of the PWM signal is used to represent the rotating speed; and when a motor fault signal is output outwards, a second frequency signal different from the first frequency band is employed. The fault state feedback method is simple, convenient to carry out, capable of feeding back different fault signals of the motor, and high in reliability.

Description

BLDC motor fault state feedback method and application BLDC motor, air conditioning system Technical field:

The invention relates to a BLDC motor fault state feedback method and application BLDC motor and air conditioning system. Background technique:

In the existing industry, the traditional air conditioning system, the BLDC motor for the coil fan (ie, the brushless DC motor) has five connection ports, one ground connection GND, one speed input port VSP, one DC bus voltage input port VDC, A low-voltage DC power input port VCC and a feedback port FG for the motor speed signal, and the interface of most air conditioner manufacturers is designed as such.

However, this straight BLDC motor does not set the state feedback of the motor, so the main control board of the air conditioner cannot read the status information of the DC brushless motor, such as over temperature, stall, over current, Hall failure, clock failure, over voltage, etc. Motor status information. As the customer demands, the motor manufacturer is required to feed back these motor status information on the DC brushless motor. The common solution now is to add a signal line to the DC brushless motor to feed back the status information of these motors, but this will change the clamp mold of the existing motor, the interface of the air conditioner motherboard, the motor interface, etc., which is very difficult to operate, and high cost.

Summary of the invention:

The object of the present invention is to provide a BLDC motor fault state feedback method and a BLDC motor and an air conditioning system. The fault state feedback method is simple, easy to operate, and can feedback different fault signals of the motor, and has high reliability; the BLDC motor has a simple structure. Without changing the structure of the existing motor, the fault signal of the motor can be fed back, the operation is simple, the cost is low, and the reliability is high; the air conditioning system has the advantages of simple structure, convenient operation and high reliability.

The object of the present invention is achieved by the following technical solutions.

A BLDC motor fault state feedback method, the BLDC motor has a feedback port FG for outputting a motor speed signal to the outside, and the FG output is a P-view signal. When the port FG outputs a motor speed signal to the outside, the frequency is defined in the first a frequency segment, in the range of the first frequency segment, the magnitude of the rotational speed is represented by the P signal frequency; when the motor fault signal is output outward, a second frequency signal different from the first frequency segment is used. When the BLDC motor described above has multiple fault signals, the different duty ratios of the PWM signals of the second frequency are used to represent different faults.

The duty ratio of all the P medical signals of the first frequency segment described above is 50%.

The first frequency range described above ranges from 10 Hz to 300 Hz, and the second frequency signal is at 1 kHz.

A BLDC motor, the stator assembly, the rotor assembly, the control circuit board, the stator assembly and the rotor assembly are magnetically coupled, the control circuit board is integrated with the microprocessor MCU, the inverter and the interface unit, and the microprocessor The MCU output signal controls the inverter, and the inverter is connected to control each phase coil winding of the stator assembly. The interface unit includes a frequency generating circuit, and an I/O port of the microprocessor MCU outputs different frequencies through the frequency generating circuit. And the P-view signal of the duty cycle and form the port FG.

The frequency generating circuit described above is a triode switching circuit.

The transistor switching circuit described above comprises a transistor Q1, a sixth resistor R1 06, a fifth resistor R1 05, a fourth resistor R1 04 and a capacitor C1 07, and the port FG is connected in series with a fourth resistor R1 04, a fifth resistor R1 05 and a power source VCC2. The node between the port FG and the fourth resistor R1 04 is connected to the capacitor C1 07- terminal, the other end of the capacitor C1 07 is grounded, and the node between the fourth resistor R1 04 and the fifth resistor R1 05 is connected to the collector of the transistor Q1, the triode The emitter of the Q1 is connected to the ground, and the base of the transistor Q1 is connected to an I/O port of the microprocessor MCU through the sixth resistor R1 06.

When the port FG described above outputs the motor speed signal to the outside, the frequency is defined in the first frequency segment, and the magnitude of the speed is represented by the P signal frequency in the range of the first frequency segment; When the signal is used, a second frequency signal different from the first frequency segment is used.

When the BLDC motor described above has multiple fault signals, the different duty ratios of the PWM signals of the second frequency are used to represent different faults, and the duty ratios of all the P signals of the first frequency section are 50%. .

The frequency of the second frequency signal described above is 1 kHz, 10% K represents overvoltage, 20% Κ represents overcurrent, 30% Κ represents overtemperature, 40% Κ represents Hall failure, and 50% Κ represents integrated power. The module is faulty.

The interface unit described above further includes a ground connection GND, a speed input port VSP, a DC bus voltage input port VDC, and a low voltage DC power input port VCC. An air conditioning system includes an air conditioning system controller and a BLDC motor that drives the fan. The air conditioning system controller and the BLDC motor have five connection ports, one ground connection GND, one speed input port VSP, and one DC bus voltage input port. VDC, a low-voltage DC power input port VCC and a feedback port FG of the motor speed signal, characterized in that: when the BLDC motor outputs a motor speed signal to the air conditioner system controller, the frequency is defined in the first frequency segment, in the first frequency segment Within the range of the P-signal signal frequency, the magnitude of the rotational speed is used; when the motor fault signal is outputted outward, a second frequency signal different from the first frequency segment is used.

When the BLDC motor described above outputs a plurality of fault signals to the air conditioner system controller, different duty ratios of the P signals of the second frequency are used to represent different faults.

The duty ratio of all PWM signals of the first frequency segment described above is 50%.

Compared with the prior art, the invention has the following effects: 1) When the BLDC motor outputs the motor speed signal outward, the frequency is defined in the first frequency segment, and the P signal frequency is used in the range of the first frequency segment. The size represents the magnitude of the rotational speed; when the motor fault signal is output outward, the second frequency signal different from the first frequency segment is used, and the motor speed signal or the motor fault signal can be output on the port FG through the shared port FG, without The utility model has the advantages of simple method, convenient operation, feedback of different fault signals of the motor, high reliability and low cost; 2) BLDC motor interface unit includes frequency generating circuit An I/O port of the microprocessor MCU outputs different frequency segment signals through the frequency generating circuit and forms a port FG. Through the shared port FG, the motor speed signal or the motor fault signal can be output on the port FG without changing. In the case of the existing motor structure, different fault signals of the motor can be fed back, the operation is simple, and the cost is low. High reliability; 3) The duty ratio of all P-view signals in the first frequency segment is 50%, the first frequency range is from 1 0HZ to 300HZ, and the second frequency signal is at 1KHZ, the configuration is simple and reasonable; When the BLDC motor outputs various fault signals to the air conditioner system controller, the different duty ratios of the P signals of the second frequency are used to represent different faults, which is simple and convenient to implement. BRIEF DESCRIPTION OF THE DRAWINGS:

1 is a schematic structural view of a brushless DC motor of the present invention;

Figure 2 is a circuit schematic diagram of the present invention;

3 is a specific circuit diagram of a frequency generating circuit of the present invention;

Figure 4 is a specific circuit diagram of the voltage dividing circuit of the present invention;

5 is a schematic diagram of feedback of a speed signal by the port FG of the present invention;

6 is a schematic diagram of another speed signal fed back by the port FG of the present invention;

7 is a schematic diagram of feedback of a fault signal by the port FG of the present invention;

8 is a schematic diagram of another fault signal fed back by the port FG of the present invention;

Figure 9 is a structural schematic diagram of the air conditioning system.

detailed description:

The present invention will be further described in detail below through the specific embodiments and the accompanying drawings:

Embodiment 1 As shown in FIG. 1 and FIG. 2, the present invention is a BLDC motor, and the DC brushless motor includes a stator assembly 1, a rotor assembly 2, a control circuit board 3, a stator assembly 1 and a rotor assembly 2 Coupling, the control circuit board 3 is integrated with a microprocessor MCU, an inverter and an interface unit, the microprocessor MCU output signal controls the inverter, and the inverter is connected to control each phase coil winding of the stator assembly 1, the interface unit Including the frequency generating circuit, an I/O port of the microprocessor MCU outputs different frequency segment signals through the frequency generating circuit and forms a port FG. The inverter may be an integrated power module IPM, which contains multiple IGBT components, Hall The component HALL detects that the rotor position signal is sent to the microprocessor MCU, and the microprocessor MCU output signal controls the inverter.

As shown in FIG. 3, the frequency generating circuit is a triode switching circuit. The triode switch circuit includes a triode Q1, a sixth resistor R106, a fifth resistor R105, a fourth resistor R104, and a capacitor C107. The port FG is connected in series with the fourth resistor R104, the fifth resistor R1 05, and the power source VCC2 +15V, and the port FG and the fourth The node between the resistor R104 is connected to the capacitor C107-terminal, the other end of the capacitor C107 is grounded, the node between the fourth resistor R104 and the fifth resistor R105 is connected to the collector of the transistor Q1, the emitter of the transistor Q1 is connected to the ground, and the base of the transistor Q1 is passed. The sixth resistor R106 is connected to an I/O port of the 敖 processor MCU. The BLDC motor has a feedback port FG for outputting the motor speed signal to the outside, and the FG outputs a PWM signal. When the port FG outputs the motor speed signal to the outside, the frequency is defined in the first frequency segment, within the range of the first frequency segment, The P-view signal frequency represents the magnitude of the rotational speed; when the motor fault signal is output outward, the second frequency signal different from the first frequency segment is used, and when the BLDC motor has multiple fault signals, the second frequency is used. The different duty cycles of the P medical signal represent different faults. The duty ratio of all PWM signals in the first frequency segment is 50%, the first frequency range is in the range of 10HZ to 300HZ, and the second frequency signal is in the 1KHZ frequency. . As shown in Figure 5, the port FG of the BLDC motor can output the first frequency segment f O=l /Tl=50HZ, Tl=0. 02 seconds, representing the feedback of the first type of speed signal, wherein the duty cycle is 50 %; As shown in Figure 6, the port FG of the BLDC motor can output the first frequency segment fl = l/T2=100HZ, T2=0. 01 seconds, but the duty cycle is still 50%, which represents the second feedback. The speed signal, since f2 > fl, indicates that the second speed is higher than the first speed.

When the port FG can output a fault signal to the outside, a frequency signal different from the first frequency segment is used to represent the fault signal. As shown in Figure 7, the port FG can output a fault frequency f2=l /T3=lkHZ, T3=0. 001 seconds, when there are multiple fault signals, use a fixed frequency PWM different from the first frequency segment. The different duty cycles of the signals represent different faults. 10% represents overvoltage, 20% represents overcurrent, 30% represents overtemperature, 40% represents Hall failure, and 50% represents integrated power module ΙΡΜ fault, which is the frequency of high frequency signals. The duty ratio of the fault frequency f2 in Fig. 7 is 80%, indicating that the fault exceeds the rated speed; as shown in Fig. 8, the port FG can output a fault frequency f 2=l/T3=lkHZ, T3=0.001 In seconds, the duty cycle of the fault frequency f 2 is 50%, and the 50% duty cycle represents the IPM fault of the integrated power module.

As shown in FIG. 2 and FIG. 4, the interface unit further includes a ground connection terminal GND, a speed input port VSP, a DC bus voltage input port VDC, and a low voltage DC power input port VCC. An I/O port of the microprocessor MCU receives the external input speed signal through the voltage divider circuit and forms the speed input port VSP. The voltage dividing circuit includes a first resistor R101, a second resistor R102, a third resistor R103, a capacitor C105, a capacitor C106, and a diode VD10L.

The principle of the present invention is: The interface unit includes a frequency generating circuit, and an I/O port of the microprocessor MCU outputs different frequency segment signals through the frequency generating circuit and forms a port FG through the shared port FG. On the port FG, the motor speed signal or the motor fault signal can be output. Without changing the structure of the existing motor, different fault signals of the motor can be fed back, and the operation is simple, the cost is low, and the reliability is high.

Embodiment 2: As shown in FIG. 1, FIG. 2, FIG. 3, and FIG. 5, the present invention is a BLDC motor including a stator assembly, a rotor assembly, a control circuit board, a stator assembly, and a rotor assembly magnetic vehicle. The control circuit board is integrated with a microprocessor MCU, an inverter and an interface unit, the microprocessor MCU output signal controls the inverter, and the inverter is connected to control each phase coil winding of the stator assembly, and the interface unit includes a frequency To generate a circuit, an I/O port of the microprocessor MCU outputs a PWM signal of a different frequency and duty ratio through a frequency generating circuit and forms a port FG. The principle of the invention is: when the port FG outputs the motor speed signal to the outside, the frequency is defined in the first frequency segment, and the frequency of the PWM signal represents the magnitude of the speed in the range of the first frequency segment; When the fault signal is used, the second frequency signal different from the first frequency segment is used. When the BLDC motor has multiple fault signals, the different duty ratios of the PWM signals of the second frequency are used to represent different faults, the first frequency segment. The duty cycle of all PWM signals is 50%. The frequency of the second frequency signal is 1KHZ, 1 0%K represents overvoltage, 2 Q%K represents overcurrent, 3 Q%K represents overtemperature, 4 Q%K represents Hall failure, 5 Q%K represents integration The power module IPM is faulty. The method is simple and easy to operate. It can feedback different fault signals of the motor, with high reliability and low cost.

Embodiment 3: As shown in FIG. 9, the present invention is an air conditioning system including an air conditioning system controller and a BLDC motor that drives a fan. The air conditioning system controller and the BLDC motor have five connection ports, and one ground connection terminal GND a speed input port VSP, a DC bus voltage input port VDC, a low voltage DC power input port VCC and a feedback port FG of the motor speed signal, wherein: when the BLDC motor outputs a motor speed signal to the air conditioning system controller, The frequency is defined in the first frequency segment, and the magnitude of the rotational speed is represented by the P signal frequency in the range of the first frequency segment; when the motor fault signal is outputted outward, the second frequency different from the first frequency segment is used signal. When the port FG outputs the motor speed signal outward, its frequency is defined in the first frequency segment. In the range of the first frequency segment, the magnitude of the frequency of the PWM signal is used to represent the magnitude of the speed; when the motor fault signal is outputted outward, Different from the second frequency signal of the first frequency segment, when the BLDC motor has multiple fault signals, the different duty cycles of the P-view signals of the second frequency are used to represent different faults, and all P-view signals of the first frequency segment Duty cycle is 50%. The frequency of the second frequency signal is 1 kHz.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and scope of the present invention are equivalent. The manner of replacement is included in the scope of protection of the present invention.

Claims

Rights request

1. A BLDC motor fault status feedback method. The BLDC motor has a feedback port FG that outputs a motor speed signal to the outside. The port FG outputs a PWM signal. It is characterized in that: when the port FG outputs a motor speed signal to the outside, , its frequency is defined in the first frequency section. Within the range of the first frequency section, the P signal frequency is used to represent the speed; when the motor fault signal is output to the outside, a third frequency that is different from the first frequency section is used. Two frequency signals.

2. A BLDC motor fault status feedback method according to claim 1, characterized in that: when the BLDC motor has multiple fault signals, different duty cycles of the P22 signal of the second frequency are used to represent different faults. .

3. A BLDC motor fault status feedback method according to claim 1 or 2, characterized in that: the duty cycle of all PWM signals in the first frequency band is 50%.

4. A BLDC motor fault status feedback method according to claim 3, characterized in that: the first frequency range range is from 10HZ to 300HZ, and the second frequency signal is at a frequency of 1KHZ.

5. A BLDC motor that implements the BLDC motor fault status feedback method according to claim 1. The BLDC motor includes a stator assembly, a rotor assembly, and a control circuit board. The stator assembly and the rotor assembly are magnetically coupled, and the control circuit board is integrated. There is a microprocessor MCU, an inverter and an interface unit. The microprocessor MCU outputs signals to control the inverter. The inverter is connected to control each phase coil winding of the stator assembly. The interface unit includes a frequency generation circuit, and the microprocessor An I/O port of the MCU outputs PWM signals of different frequencies and duty cycles through a frequency generation circuit and forms port FG.

6. A BLDC motor according to claim 3, characterized in that: the frequency generating circuit is a triode switching circuit.

7. A BLDC motor according to claim 4, characterized in that: the triode switching circuit includes a triode Q1, a sixth resistor R106, a fifth resistor R105, a fourth resistor R104 and a capacitor C107, and the port FG is connected in series The fourth resistor R104, the fifth resistor R105 and the power supply VCC2, the node between the port FG and the fourth resistor R104 is connected to one end of the capacitor C107, the other end of the capacitor C107 is connected to ground, the node between the fourth resistor R104 and the fifth resistor R105 is connected to The collector of transistor Q1 is connected, and the emitter of transistor Q1 is connected to ground. The base of the transistor Q1 is connected to an I/O port of the Ao processor MCU through the sixth resistor R106.

8. A BLDC motor according to claim 5, 6 or 7, characterized in that: when the port FG outputs a motor speed signal, its frequency is defined in the first frequency band, and within the range of the first frequency band, The frequency of the P2 signal is used to represent the speed of rotation; when the motor fault signal is output, a second frequency signal different from the first frequency band is used.

9. A BLDC motor according to claim 8, characterized in that: when the BLDC motor has multiple fault signals, different duty cycles of the P28 signal of the second frequency are used to represent different faults, and the first frequency The duty cycle of all PWM signals in the segment is 50%. .

10. A BLDC motor according to claim 9, characterized in that: the frequency of the second frequency signal is 1KHZ, 1Q%K represents overvoltage, 2Q%K represents overcurrent, and 3Q%K represents overtemperature. , 4 Q%K represents Hall failure, 50%K represents integrated power module IPM failure.

11. A BLDC motor according to claim 7, characterized in that: the interface unit further includes a ground terminal GND, a speed input port VSP, a DC bus voltage input port VDC and a low-voltage DC power input port VCC.

12. An air conditioning system using the BLDC motor of claim 5, including an air conditioning system controller and a BLDC motor that drives a fan. The air conditioning system controller and the BLDC motor have five connection ports, one of which is connected to the ground terminal GND. A speed input port VSP, a DC bus voltage input port VDC, a low-voltage DC power input port VCC and a feedback port FG for the motor speed signal, which are characterized by: When the BLDC motor outputs the motor speed signal to the air conditioning system controller, its frequency It is defined in the first frequency segment. Within the range of the first frequency segment, the frequency of the P2 signal is used to represent the size of the rotation speed; when the motor fault signal is output to the outside, a second frequency signal different from the first frequency segment is used. .

13. An air conditioning system according to claim 12, characterized in that: when the BLDC motor outputs multiple fault signals to the air conditioning system controller, different duty cycles of the P medical signal of the second frequency are used to represent different fault signals. failure.

14. An air conditioning system according to claim 13, characterized in that: the duty cycle of all PWM signals in the first frequency band is 50%.

15. An air conditioning system according to claim 12, 13 or 14, characterized in that: the first frequency range range is from 10HZ to 300HZ, and the second frequency signal is at a frequency of 1KHZ.