Motor inner rotor signal detection circuit with fault diagnosis and motor

Abstract

The utility model discloses a motor inner rotor signal detection circuit with fault diagnosis and a motor, the circuit comprises a diagnosis protection circuit, a divider resistance circuit and a single-end processing circuit, an inner rotor double-end differential signal output by the motor is input to the diagnosis protection circuit, the diagnosis protection circuit is connected with the divider resistance circuit, and the divider resistance circuit is connected with the single-end processing circuit. The divider resistance circuit is connected with the single-end processing circuit, and the detection circuit is used for converting the inner rotor double-end differential signal into a single-end signal. According to the invention, on one hand, simplification of the detection circuit is realized, and on the other hand, fault detection of the motor inner rotor is realized. The high-speed motor can be used in the aerospace field.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of motor control, in particular to a motor with a fault diagnosis function and a motor rotor signal detection circuit. BACKGROUND

[0002] The high-speed motor can be used as an aerospace high-power high-power-density motor.

[0003] In the related art, the signal collection of the motor rotor is achieved by means of a rotary transformer. Although this method can realize the detection of the position of the inner rotor, the rotary transformer circuit structure is complex, and this scheme is not suitable for the signal detection of the inner rotor of the high-speed motor. CONTENT OF THE UTILITY MODEL

[0004] The application provides a motor with a fault diagnosis function and a motor rotor signal detection circuit to simplify the circuit and realize fault detection.

[0005] The application adopts the following technical solutions:

[0006] In a first aspect, the application provides a motor rotor signal detection circuit with a fault diagnosis function, which comprises a diagnosis protection circuit, a voltage division resistor circuit and a single-end processing circuit. The inner rotor double-end differential signal output by the motor is input to the diagnosis protection circuit. The diagnosis protection circuit is connected to the voltage division resistor circuit. The voltage division resistor circuit is connected to the single-end processing circuit.

[0007] The detection circuit is used to convert the inner rotor double-end differential signal into a single-end signal.

[0008] In some embodiments, the detection circuit is also used for fault diagnosis of the motor.

[0009] In some embodiments, the detection circuit is also used as the inner rotor signal detection circuit of the motor.

[0010] In some embodiments, the diagnosis protection circuit is used to diagnose the open circuit or short circuit condition between the inner rotor double-end differential signals, and to pull up the positive electrode of the inner rotor double-end differential signal and pull down the negative electrode of the inner rotor double-end differential signal.

[0011] In some embodiments, the voltage division resistor circuit is used to reduce the voltage to a preset voltage range of the processor.

[0012] In some embodiments, the voltage division coefficient in the voltage division resistor circuit is adjusted according to the resistance in the voltage division resistor circuit.

[0013] In some embodiments, the single-end processing circuit adopts an LMV931Q1 type main chip.

[0014] In some embodiments, further comprising: a processor AD port connected with the single-ended processing circuit.

[0015] In some embodiments, the motor comprises a high-speed motor with a rotation speed of more than 20,000 revolutions.

[0016] In the second aspect, the embodiments of the present application further provide a motor, comprising the detection circuit in the first aspect.

[0017] The above at least one technical solution adopted by the embodiments of the present application can achieve the following beneficial effects: the circuit comprises a diagnostic protection circuit, a voltage division resistance circuit, and a single-ended processing circuit. The inner rotor double-ended differential signal output by the motor is input to the diagnostic protection circuit, the diagnostic protection circuit is connected with the voltage division resistance circuit, and the voltage division resistance circuit is connected with the single-ended processing circuit. The detection circuit is used to convert the inner rotor double-ended differential signal into a single-ended signal, which can not only diagnose the fault of the motor, but also serve as the inner rotor signal detection circuit of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are included to provide a further understanding of the present application, constitute a part of the present application and illustrate the illustrative embodiments of the present application and their description serve to explain the present application, but do not constitute improper limitations on the present application. In the drawings:

[0019] Figure 1 FIG. 1 is a schematic diagram of the internal structure of the motor inner rotor signal detection circuit with fault diagnosis in the embodiments of the present application;

[0020] Figure 2 FIG. 2 is a schematic diagram of the internal structure of the motor inner rotor signal detection circuit with fault diagnosis in the preferred embodiments of the present application;

[0021] Figure 3 FIG. 3 is a schematic diagram of the circuit principle of the motor inner rotor signal detection circuit with fault diagnosis in the embodiments of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts fall within the scope of protection of the present application.

[0023] The technical solutions provided by the embodiments of the present application will be described in detail below in combination with the drawings.

[0024] The embodiment of the present application provides a motor inner rotor signal detection circuit with fault diagnosis, as shown in the figure, the internal structure schematic diagram of the detection circuit in the embodiment of the present application is provided, the circuit comprises: a diagnosis protection circuit 110, a voltage division resistor circuit 120, a single-end processing circuit 130, the inner rotor double-end differential signal output by a motor is input into the diagnosis protection circuit, the diagnosis protection circuit is connected with the voltage division resistor circuit, the voltage division resistor circuit is connected with the single-end processing circuit, and the detection circuit is used for converting the inner rotor double-end differential signal into a single-end signal. Figure 1

[0025] Please refer to Figure 1 In the embodiment of the present application, the diagnosis protection circuit 110, the voltage division resistor circuit 120 and the single-end processing circuit 130 are used in sequence, and the inner rotor double-end differential signal output by a motor can be converted into a single-end signal. Considering that the inner rotor position information of the motor in the actual scene is detected through the inner rotor signal line, a detection circuit is used for the inner rotor signal of the motor.

[0026] In specific implementation, the motor is electrically connected with the diagnosis protection circuit 110, the inner rotor double-end differential signal output by the motor is input into the diagnosis protection circuit 110, and whether the inner rotor double-end differential signal is open circuit or short circuit is mainly judged in the diagnosis protection circuit 110, which is used as a protection circuit. Further, a resistor voltage division network is provided in the voltage division resistor circuit 120, and the main function is to reduce the voltage to the voltage range acceptable by the processor. The single-end processing circuit 130 is connected with the voltage division resistor circuit 120, and the main function is to convert the double-end signal after voltage reduction into a single-end signal, so that the double-end differential signal is converted into a single-end signal and sent to the corresponding port of the processor.

[0027] In the preferred embodiment of the present application, the detection circuit is also used for fault diagnosis of the motor. In the actual scene of motor control, the inner rotor position signal can be detected in the detection circuit, and fault diagnosis is realized on the position signal, thereby facilitating the subsequent motor control link.

[0028] In the preferred embodiment of the present application, the detection circuit is also used as the inner rotor signal detection circuit of the motor. The detection circuit is also used as the inner rotor signal detection circuit with fault diagnosis, which not only provides a detection circuit but also provides a fault diagnosis circuit.

[0029] In the preferred embodiment of the present application, the diagnosis protection circuit 110 is used for diagnosing whether the inner rotor double-end differential signal is open circuit or short circuit, and the positive electrode of the inner rotor double-end differential signal is pulled up and the negative electrode of the inner rotor double-end differential signal is pulled down.

[0030] Please refer to​Figure 3 Specifically, a 10k resistor is pulled up on the positive pole of the differential signal at the signal interface, and a 10k resistor is pulled down on the negative pole of the differential signal, for diagnosing open circuit and short circuit between input signals of the inner rotor.

[0031] In the preferred embodiment of the present application, the voltage dividing resistor circuit 120 is used to reduce the voltage to a preset voltage range of the processor.

[0032] Please refer to Figure 3 The voltage dividing coefficient can be adjusted according to the resistance to reduce the voltage to the acceptable voltage range 0-3.3V of the processor through the resistance voltage dividing network, which saves the processor resources and increases the input impedance.

[0033] In the preferred embodiment of the present application, the voltage dividing coefficient in the voltage dividing resistor circuit 120 is adjusted according to the resistance in the voltage dividing resistor circuit.

[0034] Please refer to Figure 3 The voltage dividing coefficient can be adjusted according to the resistance to reduce the voltage to the acceptable voltage range 0-3.3V of the processor through the resistance voltage dividing network.

[0035] In the preferred embodiment of the present application, the single-ended processing circuit 130 adopts a main chip of the LMV931Q1 model.

[0036] Please refer to Figure 3 The differential signal is converted into a single-ended signal by the single-ended signal processing circuit LMV931Q1 and its peripheral circuit, and then sent to the corresponding port of the processor. The LMV931Q1 is a low-voltage and low-power operational amplifier, which can be used in the fields of automobiles and aviation.

[0037] In the preferred embodiment of the present application, the processor AD port is connected with the single-ended processing circuit. It can be understood that the AD conversion interface is an analog-to-digital conversion interface.

[0038] Please refer to Figure 3 The differential signal of the inner rotor of the high-speed motor with a speed of more than 20,000 rpm is collected and processed by the inner rotor detection circuit, and then sent to the AD port of the processor. The positive pole of the differential signal is pulled up, and the negative pole of the differential signal is pulled down at the signal interface, for diagnosing open circuit and short circuit between input signals of the inner rotor. The voltage is reduced to the acceptable voltage range of the processor through the resistance voltage dividing network, and then the differential signal is converted into a single-ended signal by the single-ended signal processing circuit LMV931Q1 and its peripheral circuit (load circuit or power supply circuit), which saves the processor resources and sends the single-ended signal to the corresponding port of the processor.

[0039] In the preferred embodiment of the present application, the motor includes a high-speed motor with a speed of more than 20,000 rpm.

[0040] Specifically, the function of detecting rotor position information of a high-speed motor with a speed of more than 20,000 rpm is realized, the detection circuit can make fault diagnosis and effectively reduce the complexity of the circuit, and the processor resources are also saved.

[0041] The application further provides an electric motor comprising the fault diagnosis enabled rotor signal detection circuit, the detection circuit comprising a diagnosis protection circuit, a voltage dividing resistor circuit and a single-end processing circuit, the double-end differential signals of the rotor output by the electric motor are input into the diagnosis protection circuit, the diagnosis protection circuit is connected with the voltage dividing resistor circuit, the voltage dividing resistor circuit is connected with the single-end processing circuit, and

[0042] The detection circuit is used for converting the double-end differential signals of the rotor into single-end signals.

[0043] In some embodiments, the detection circuit is further used for making fault diagnosis of the electric motor.

[0044] In some embodiments, the detection circuit is further used as a rotor signal detection circuit of the electric motor.

[0045] In some embodiments, the diagnosis protection circuit is used for diagnosing the open circuit or short circuit between the double-end differential signals of the rotor, and is used for pulling up the positive electrode of the double-end differential signals of the rotor and pulling down the negative electrode of the double-end differential signals of the rotor.

[0046] In some embodiments, the voltage dividing resistor circuit is used for reducing the voltage to a preset voltage range of a processor.

[0047] In some embodiments, the voltage dividing coefficient in the voltage dividing resistor circuit is adjusted according to the resistance in the voltage dividing resistor circuit.

[0048] In some embodiments, the single-end processing circuit adopts a main chip of the LMV931Q1 type.

[0049] In some embodiments, the application further comprises a processor AD port, which is connected with the single-end processing circuit.

[0050] In some embodiments, the electric motor comprises a high-speed motor with a speed of more than 20,000 rpm.

[0051] The above merely illustrates the embodiments of the application, and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application should be included in the scope of the claims of the application.

Claims

1. A motor internal rotor signal detection circuit with fault diagnosis, wherein, The circuit comprises a diagnostic protection circuit, a voltage dividing resistor circuit, and a single-ended processing circuit; the inner rotor double-ended differential signals output by the motor are input to the diagnostic protection circuit; the diagnostic protection circuit is connected to the voltage dividing resistor circuit; the voltage dividing resistor circuit is connected to the single-ended processing circuit; and The detection circuit is used to convert the inner rotor double-ended differential signals into single-ended signals.

2. The circuit of claim 1, wherein, The detection circuit is also used to diagnose faults of the motor.

3. The circuit of claim 1, wherein, The detection circuit is also used as an inner rotor signal detection circuit of the motor.

4. The circuit of claim 1, wherein, The diagnostic protection circuit is used to diagnose whether the inner rotor double-ended differential signals are open or short circuited, and to pull up the positive electrode of the inner rotor double-ended differential signals and pull down the negative electrode of the inner rotor double-ended differential signals.

5. The circuit of claim 1, wherein, The voltage dividing resistor circuit is used to reduce the voltage to a preset voltage range of the processor.

6. The circuit of claim 5, wherein, The voltage dividing coefficient in the voltage dividing resistor circuit is adjusted according to the resistance in the voltage dividing resistor circuit.

7. The circuit of claim 6, wherein, The single-ended processing circuit adopts an LMV931Q1 type main chip.

8. The circuit of claim 1, wherein, Further comprising: A processor AD port connected to the single-ended processing circuit.

9. The circuit of claim 1, wherein, The motor comprises a high-speed motor with a rotational speed of more than 20,000 rpm.

10. An electric machine wherein, The detection circuit comprises any one of claims 1 to 9. The detection circuit comprises any one of claims 1 to 9.

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