Motor detection circuit and equipment
By building a motor detection circuit, using components such as current limiting resistors, voltage divider resistors and controllers, static detection of the motor status is achieved, solving the problem that traditional detection methods cannot promptly detect short circuits between the motor end and the ground, and ensuring safe operation of the motor.
Patent Information
- Application Number
- CN202422412507.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-09-30
AI Technical Summary
Traditional motor detection methods cannot detect short circuits between the motor end and ground in time, resulting in serious electrical failures during startup and damage to the motor and driving circuits.
A motor detection circuit is designed, including a motor drive sub-circuit, a test power supply, a current limiting resistor, a voltage divider and a motor output detection interface. By generating an analog detection voltage signal and converting it into a digital signal, combining a pull-up resistor, a pull-down resistor and a decoupling capacitor, static detection is realized, and a controller is introduced to make intelligent judgments.
It realizes comprehensive and accurate detection of the motor's state before operation, prevents damage caused by abnormal state, improves the safety and reliability of the motor and drive circuit, and adapts to the needs of modern industrial automation.
Smart Images
Figure CN223229657U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of electric motors, and in particular to a motor detection circuit and device. Background Art
[0002] Traditional motor detection methods cannot detect circuit anomalies, such as short circuits between the motor terminals and ground, before the motor starts. If such potential faults are not detected and addressed promptly, they can cause serious electrical failures during motor startup, potentially damaging the motor and associated drive circuits, leading to system shutdown or failure. Utility Model Content
[0003] In order to help solve the problem that traditional motor detection methods cannot detect the short circuit between the motor terminal and the ground in time before the motor starts, the present application provides a motor detection circuit and device.
[0004] In a first aspect, the present application provides a motor detection circuit, which adopts the following technical solution:
[0005] A motor detection circuit, wherein the motor has a motor input terminal, wherein the motor input terminal includes a motor positive input terminal and a motor negative input terminal, wherein the detection circuit includes a motor drive subcircuit, a test power supply, a current limiting resistor, a voltage dividing resistor and a motor output detection interface,
[0006] The motor driving subcircuit has a driving subcircuit positive output terminal and a driving subcircuit negative output terminal, which are used to drive the motor to rotate. The driving subcircuit positive output terminal is used to connect to the positive input terminal of the motor, and the driving subcircuit negative output terminal is used to connect to the negative input terminal of the motor.
[0007] The test power supply is used to connect to the motor input terminal,
[0008] The current limiting resistor includes a first current limiting resistor and a second current limiting resistor, which are used to limit the current in the detection circuit.
[0009] The voltage dividing resistor includes a first voltage dividing resistor and a second voltage dividing resistor, and is used to generate an analog detection voltage signal according to the test power supply.
[0010] The motor output detection interface includes a motor positive output detection interface and a motor negative output detection interface, which are used to convert the analog detection voltage signal into a digital detection voltage signal.
[0011] One end of the first current limiting resistor is connected to the positive output end of the driving sub-circuit, and the other end is connected to the first voltage dividing resistor and the positive output detection interface of the motor. One end of the second current limiting resistor is connected to the negative output end of the driving sub-circuit, and the other end is connected to the second voltage dividing resistor and the negative output detection interface of the motor. One end of the first voltage dividing resistor is connected to the first current limiting resistor, and the other end is grounded. One end of the second voltage dividing resistor is connected to the second current limiting resistor, and the other end is grounded.
[0012] By adopting the above technical solution, a motor drive subcircuit, a test power supply, a current-limiting resistor, a voltage-divider resistor, and a motor output detection interface are constructed to achieve static detection of the motor input. The combination of the current-limiting resistor and the voltage-divider resistor enables the test power supply to generate an analog detection voltage signal without driving the motor. This signal is then converted to a digital signal for subsequent processing via the motor output detection interface. This design can detect whether the motor is short-circuited to ground before the motor is actuated, effectively protecting the motor and drive circuit from damage caused by abnormal motor conditions.
[0013] Preferably, the detection circuit further includes a pull-up resistor and a pull-down resistor.
[0014] One end of the pull-up resistor is connected to the test power supply, and the other end is connected to the positive output terminal of the drive sub-circuit, and is used to limit the input voltage of the positive input terminal of the motor.
[0015] One end of the pull-down resistor is connected to the negative output terminal of the driving sub-circuit, and the other end is grounded, so as to limit the input voltage of the negative input terminal of the motor.
[0016] By adopting this technical solution, pull-up and pull-down resistors are added to limit the input voltage at the motor input terminals. This further enhances circuit safety, preventing damage to the motor and circuitry caused by excessively high or low voltages. It also helps improve detection accuracy, ensuring accurate determination of the motor's status under varying voltage conditions.
[0017] Preferably, the detection circuit further includes a decoupling capacitor, and the decoupling capacitor includes a first decoupling capacitor and a second decoupling capacitor, the first decoupling capacitor is connected in parallel to the first voltage-dividing resistor, and the second decoupling capacitor is connected in parallel to the second voltage-dividing resistor.
[0018] By adopting the above technical solution, decoupling capacitors are introduced, connected in parallel with the first and second voltage-dividing resistors. The main function of the decoupling capacitors is to filter out high-frequency noise in the power supply, stabilize the voltage signal, and improve the circuit's anti-interference ability. This helps improve the accuracy of the detection signal and reduce false positives caused by external interference.
[0019] Preferably, the detection circuit further includes an operational amplifier output interface, an operational amplifier acquisition subcircuit and a sampling resistor, wherein the operational amplifier acquisition subcircuit has a non-inverting input terminal, an inverting input terminal and an operational amplifier output terminal.
[0020] One end of the sampling resistor is connected to the non-inverting input terminal, and the other end is connected to the inverting input terminal, and is used to convert the output current of the negative output terminal of the driving sub-circuit into a sampling voltage.
[0021] The operational amplifier acquisition sub-circuit is used to amplify the sampled voltage.
[0022] The operational amplifier output interface is connected to the operational amplifier output terminal and is used to output the amplified sampling voltage.
[0023] By adopting the above technical solution, an operational amplifier acquisition subcircuit and a sampling resistor are added to the detection circuit to sample and amplify the output current at the negative output terminal of the motor drive subcircuit. This design can monitor the motor current in real time during dynamic operation, further enabling dynamic detection of the motor. Combined with static detection, this provides comprehensive monitoring of the motor's status.
[0024] Preferably, the detection circuit includes a controller, which is used to determine the state of the motor. The controller includes an input and output interface, and the input and output interface includes a first input and output interface, a second input and output interface, and a third input and output interface. The first input and output interface is connected to the positive output detection interface of the motor, the second input and output interface is connected to the negative output detection interface of the motor, and the third input and output interface is connected to the op amp output interface.
[0025] By adopting the above technical solution, a controller is introduced, including input and output interfaces, for receiving signals from the motor output detection interface and the op amp output interface, and determining the motor status accordingly. The introduction of the controller makes the detection circuit intelligent, automatically adjusting the motor's operating status based on the detection results, improving the automation level and reliability of the equipment.
[0026] Preferably, the controller also includes a logic judgment unit and a control unit, the logic judgment unit is used to judge the state of the motor according to the physical quantity of the input and output interface, and the control unit is used to control the start and stop of the motor according to the state, and the state includes the short-circuit power state of the motor input terminal, the short-circuit ground state of the motor input terminal, the open circuit state of the motor input terminal and the normal state of the motor.
[0027] By adopting the above technical solution, the functions of the controller's logic judgment unit and control unit are described in detail, clarifying how the controller determines the state of the motor based on the physical quantities of the input and output interfaces and controls the start and stop of the motor based on the state. This design enables the motor detection circuit to quickly respond to changes in the motor state and take corresponding measures, effectively protecting the safety of the motor and drive circuit.
[0028] Preferably, the controller is a single chip microcomputer, and the single chip microcomputer is used to clamp the voltage of the motor output detection interface.
[0029] By adopting the above technical solution, a single-chip microcomputer is specified as the controller, and its role in clamping the voltage at the motor output detection interface is emphasized. The use of a single-chip microcomputer not only improves the integration and intelligence level of the detection circuit, but also, through its powerful processing capabilities, enables precise processing and control of the detection signal. The clamping effect enables the detection circuit to detect short-circuit power supply conditions, short-circuit ground conditions, open circuit conditions, and normal motor conditions at the motor input.
[0030] In a second aspect, the present application provides a motor detection device, which adopts the following technical solution:
[0031] A motor detection device, wherein the motor detection device includes the motor detection circuit as described in any one of the first aspects.
[0032] By adopting this technical solution, the motor detection device integrates all the advantages of the motor detection circuit, can comprehensively and accurately detect the motor status, and take timely measures to protect the motor and drive circuit when an anomaly is detected. This device has broad application prospects in industrial automation, robotic control and other fields.
[0033] In summary, this application proposes a motor detection circuit and a motor detection device incorporating the circuit. The motor detection circuit of the present application achieves comprehensive and accurate detection of the motor's status. This circuit has the advantages of low cost, wide application, high intelligence, and strong anti-interference capabilities. It can detect the motor's status in real time before and during operation and take appropriate protective measures based on the detection results, effectively protecting the safety of the motor and drive circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] Figure 1 This is a schematic structural diagram of an embodiment of a motor detection circuit of the present application.
[0035] Figure numerals: 1. motor driving subcircuit; 2. operational amplifier acquisition subcircuit; 3. motor. DETAILED DESCRIPTION
[0036] With reference to the accompanying drawings and specific embodiments, the structure, composition, characteristics and advantages of a motor detection circuit and device according to the present application will be described below in an exemplary manner. However, all descriptions should not be used to form any limitations on the present application.
[0037] In addition, for any single technical feature described or implied in the embodiments mentioned in this document, or any single technical feature shown or implied in the drawings, this application still allows for continued arbitrary combination or deletion between these technical features (or their equivalents) without any technical obstacles, and thus it should be considered that these more embodiments according to this application are also within the scope of the description in this document.
[0038] It should also be noted that terms such as "disposed" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediary. Unless otherwise specified, those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0039] In motor drive systems, accurate detection of the motor's output status is crucial for ensuring safe and reliable operation. Traditional motor detection methods often rely on dynamic detection during actual motor operation. This involves measuring parameters such as current and voltage to determine the motor's status during operation. However, this approach has significant limitations, as it can only detect motor failures while the motor is running and cannot proactively detect potential faults such as short circuits and open circuits when the motor is stationary.
[0040] Furthermore, the rapid development of industrial automation and robotics has placed higher demands on the accuracy, stability, and reliability of motor detection circuits. Traditional detection methods often struggle to meet the demands of modern industrial applications due to complex circuit design, high costs, and poor anti-interference capabilities.
[0041] Therefore, a new method for statically detecting the motor's status before it operates is urgently needed to detect potential faults in advance, avoid damage to the motor and drive circuit, and improve the reliability and safety of the entire system. At the same time, this method should also be low-cost, widely applicable, highly intelligent, and have strong anti-interference capabilities to adapt to the development trend of modern industrial automation.
[0042] Figure 1The present invention is a schematic structural diagram of an embodiment of the motor detection circuit of the present application. In this embodiment, the detection circuit may include a motor drive subcircuit 1, a test power supply, a current limiting resistor, a voltage dividing resistor, and a motor output detection interface. The motor 3 has a motor input terminal, which includes a motor positive input terminal and a motor negative input terminal. The motor drive subcircuit 1 has a drive subcircuit positive output terminal and a drive subcircuit negative output terminal, which are used to drive the motor 3 to rotate. The current limiting resistor includes a first current limiting resistor and a second current limiting resistor, which are used to limit the current in the detection circuit. The voltage dividing resistor includes a first voltage dividing resistor and a second voltage dividing resistor, which are used to generate an analog detection voltage signal according to the test power supply. The motor output detection interface includes a motor positive output detection interface and a motor negative output detection interface, which are used to convert the analog detection voltage signal into a digital detection voltage signal.
[0043] In this embodiment, the motor drive subcircuit can be Figure 1 In U1, the positive input terminal of the motor and the negative input terminal of the motor can be Figure 1 The M+ on the upper side and the M- on the lower side of the motor 3, the positive output terminal of the driving sub-circuit and the negative output terminal of the driving sub-circuit can be respectively Figure 1 M+ and M- on the right side of the driver subcircuit. The test power supply can be Figure 1 In TEST_12V, the first current limiting resistor can be Figure 1 The second current limiting resistor R4 can be Figure 1 The first voltage divider resistor R1 can be Figure 1 The second voltage divider resistor R5 can be Figure 1 R7 in.
[0044] from Figure 1 It can be seen that the positive output terminal of the driving sub-circuit is used to connect to the positive input terminal of the motor, the negative output terminal of the driving sub-circuit is used to connect to the negative input terminal of the motor, the test power supply is used to connect to the motor input terminal, one end of R4 is connected to the positive output terminal of the driving sub-circuit, and the other end is connected to R5 and the positive output detection interface M+_AD of the motor, one end of R1 is connected to the negative output terminal of the driving sub-circuit, and the other end is connected to R7 and the negative output detection interface M-_AD of the motor, one end of R5 is connected to R4, and the other end is grounded, one end of R7 is connected to R1, and the other end is grounded.
[0045] By constructing components such as the motor drive subcircuit 1, a test power supply, a current-limiting resistor, a voltage-divider resistor, and a motor output detection interface, static detection of the motor input terminal is achieved. The combination of the current-limiting resistor and the voltage-divider resistor enables the test power supply to generate an analog detection voltage signal without driving motor 3. This signal is then converted to a digital signal for subsequent processing via the motor output detection interface. This design can detect whether motor 3 is short-circuited to ground before it is activated, effectively protecting motor 3 and the drive circuit from damage caused by abnormal motor 3 conditions.
[0046] The motor detection circuit may also include a pull-up resistor R6, a pull-down resistor R2, and a decoupling capacitor. One end of R6 is connected to the test power supply and the other end is connected to the positive output terminal of the driver subcircuit, used to limit the input voltage at the positive input terminal of the motor. One end of R2 is connected to the negative output terminal of the driver subcircuit and the other end is grounded, used to limit the input voltage at the negative input terminal of the motor. The decoupling capacitors include a first decoupling capacitor C58 and a second decoupling capacitor C5. C58 is connected in parallel with R5, and C5 is connected in parallel with R7.
[0047] By adding pull-up and pull-down resistors, the input voltage at the motor input is limited. This further enhances circuit safety, preventing damage to the motor and circuitry caused by excessively high or low voltages. This also helps improve detection accuracy, ensuring accurate determination of the motor 3's status under varying voltage conditions. The primary function of the decoupling capacitor is to filter out high-frequency noise from the power supply, stabilize the voltage signal, and improve the circuit's anti-interference capabilities. This helps improve the accuracy of the detection signal and reduce misjudgments caused by external interference.
[0048] The detection circuit also includes an op amp output interface, an operational amplifier acquisition subcircuit 2, and a sampling resistor R3. The operational amplifier acquisition subcircuit 2 has a non-inverting input terminal IN+, an inverting input terminal IN-, and an op amp output terminal AD_OUT0. One end of R3 is connected to the non-inverting input terminal, and the other end is connected to the inverting input terminal. It is used to convert the output current of the negative output terminal of the driving subcircuit into a sampling voltage. Figure 1 In the embodiment, the operational amplifier acquisition sub-circuit 2 may be U2, which is used to amplify the sampling voltage. The operational amplifier output interface is connected to the output terminal of the operational amplifier, and is used to output the amplified sampling voltage.
[0049] By adding an operational amplifier acquisition subcircuit 2 and a sampling resistor to the detection circuit, the output current from the negative output terminal of motor drive subcircuit 1 is sampled and amplified. This design enables real-time monitoring of motor 3's current during dynamic operation, further enabling dynamic detection of motor 3. Combined with static detection, this provides comprehensive monitoring of motor 3's status.
[0050] The detection circuit also includes a controller ( Figure 1 (not shown in the figure), the controller is used to determine the state of the motor 3. The controller includes an input and output interface, and the input and output interface includes a first input and output interface, a second input and output interface, and a third input and output interface. The first input and output interface is connected to the motor positive output detection interface, the second input and output interface is connected to the motor negative output detection interface, and the third input and output interface is connected to the op amp output interface. The controller also includes a logic judgment unit and a control unit. The logic judgment unit is used to determine the state of the motor 3 based on the physical quantities of the input and output interfaces. The control unit is used to control the start and stop of the motor 3 based on the state. The state includes the state of the motor input terminal short-circuited to power supply, the motor input terminal short-circuited to ground, the motor input terminal open circuit, and the motor normal state. In this embodiment, the controller can be a single-chip microcomputer, which is used to clamp the voltage of the motor output detection interface.
[0051] By introducing a controller that receives signals from the motor output detection interface and the op amp output interface and judges the status of motor 3 accordingly, the introduction of the controller makes the detection circuit intelligent and can automatically adjust the operating status of motor 3 according to the detection results, thus improving the automation level and reliability of the equipment.
[0052] The application of single-chip microcomputer not only improves the integration and intelligence level of the detection circuit, but also realizes the precise processing and control of the detection signal through its powerful processing capability. The clamping effect enables the detection circuit to detect the short-circuit power supply state at the motor input end, the short-circuit ground state at the motor input end, the open circuit state at the motor input end and the normal state of the motor.
[0053] Next, the specific working principle of the motor detection circuit of the present application is described.
[0054] Motor input short circuit power supply status detection:
[0055] During motor-side short-circuit detection, when the TEST_12V signal is high (12V), the motor-side short circuits to the power supply, resulting in a voltage of 12V at both pin 2 of R6 and pin 1 of R4. Subsequently, R4 and R5 act as voltage divider resistors. Since they have the same resistance value, the voltages at both pin 2 of R4 and pin 2 of R5 are 6V. However, due to the voltage clamping function of the microcontroller's IO port, the voltage actually detected by M+_AD is clamped to 5V. Similarly, due to the motor-side short circuit, the voltages at pin 1 of R1 and pin 1 of R2 are also 12V. After voltage division by R1 and R7 (both have the same resistance value), the voltages at pin 2 of R1 and pin 2 of R7 are 6V. However, this voltage is also clamped to 5V by the MCU's IO port, so the voltage detected by M-_AD is also 5V.
[0056] When the TEST_12V signal is low (0V), although the motor terminal is still short-circuited to the power supply, the voltage distribution in the detection circuit is similar to that described above, except that the voltages at all relevant points are divided based on 0V. Ultimately, the voltages recognized by M+_AD and M-_AD are still clamped to 0V (no microcontroller is required to clamp because the voltage itself is 0V).
[0057] Motor input short circuit status detection:
[0058] During motor-terminal short-to-ground detection, when the TEST_12V signal is high (12V), the motor terminal is shorted to ground, and the voltages at pin 2 of R6 and pin 1 of R4 are both 0V. Therefore, the voltage detected by M+_AD is 0V. Similarly, the voltages at pins 1 of R1 and 1 of R2 are also 0V, and the voltage detected by M-_AD is also 0V. When the TEST_12V signal is low (0V), the entire detection circuit is in a low-level state, and the voltages at pins 2 of R6 and 1 of R2 are both 0V. Therefore, the voltages detected by M+_AD and M-_AD are also 0V.
[0059] Detection of open circuit status at the motor input terminal:
[0060] During motor open-circuit detection, when the TEST_12V signal is high (12V), due to an open circuit in Motor 3, the voltage at pin 2 of R6 and pin 1 of R4 is 12V. After voltage division by R4 and R5 (both have the same resistance value), the voltage at pin 2 of R4 is 6V. However, the voltage detected by M+_AD is clamped to 5V by the microcontroller's IO. Meanwhile, due to the open circuit in the motor, the voltage at pin 1 of R1 is 0V, so the voltage detected by M-_AD is also 0V. When the TEST_12V signal is low (0V), the voltage at all relevant points is 0V, and the voltage detected by M+_AD and M-_AD is also 0V.
[0061] Motor normal state detection:
[0062] When Motor 3 is operating normally, when the TEST_12V signal is high (12V), due to the low internal resistance of Motor 3 (basically in ohms), resistors R6 and R2 divide the voltage, resulting in a voltage of 6V at pin 2 of R6 and pin 1 of R4. After voltage division by R4 and R5 (both with the same resistance value), the voltage at pin 2 of R4 is 3V, and the voltage detected by M+_AD is also 3V. Similarly, after voltage division by R1 and R7, the voltage at pin 2 of R1 is 3V, and the voltage detected by M-_AD is also 3V. When the TEST_12V signal is low (0V), the voltage at all relevant points is 0V, and the voltage detected by M+_AD and M-_AD is also 0V.
[0063] This application also provides a motor detection device, comprising the aforementioned motor detection circuit. The motor detection device integrates all the advantages of the motor detection circuit, enabling comprehensive and accurate detection of the motor's status and, when an anomaly is detected, timely measures to protect the motor and drive circuit. This device has broad application prospects in fields such as industrial automation and robotic control.
[0064] In summary, the motor detection circuit of this application achieves comprehensive and accurate detection of the motor's status. This circuit has the advantages of low cost, wide application, high intelligence, and strong anti-interference capabilities. It can detect the motor's status in real time before and during operation and take appropriate protective measures based on the detection results, effectively protecting the safety of the motor and drive circuit.
[0065] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A motor detection circuit, wherein the motor has a motor input terminal, the motor input terminal including a motor positive input terminal and a motor negative input terminal, characterized in that: The detection circuit includes a motor drive subcircuit, a test power supply, a current limiting resistor, a voltage dividing resistor and a motor output detection interface. The motor driving subcircuit has a driving subcircuit positive output terminal and a driving subcircuit negative output terminal, which are used to drive the motor to rotate. The driving subcircuit positive output terminal is used to connect to the positive input terminal of the motor, and the driving subcircuit negative output terminal is used to connect to the negative input terminal of the motor. The test power supply is used to connect to the motor input terminal, The current limiting resistor includes a first current limiting resistor and a second current limiting resistor, which are used to limit the current in the detection circuit. The voltage dividing resistor includes a first voltage dividing resistor and a second voltage dividing resistor, and is used to generate an analog detection voltage signal according to the test power supply. The motor output detection interface includes a motor positive output detection interface and a motor negative output detection interface, which are used to convert the analog detection voltage signal into a digital detection voltage signal. One end of the first current limiting resistor is connected to the positive output end of the driving sub-circuit, and the other end is connected to the first voltage dividing resistor and the positive output detection interface of the motor. One end of the second current limiting resistor is connected to the negative output end of the driving sub-circuit, and the other end is connected to the second voltage dividing resistor and the negative output detection interface of the motor. One end of the first voltage dividing resistor is connected to the first current limiting resistor, and the other end is grounded. One end of the second voltage dividing resistor is connected to the second current limiting resistor, and the other end is grounded.
2. The detection circuit according to claim 1, characterized in that The detection circuit also includes a pull-up resistor and a pull-down resistor, One end of the pull-up resistor is connected to the test power supply, and the other end is connected to the positive output terminal of the drive sub-circuit, and is used to limit the input voltage of the positive input terminal of the motor. One end of the pull-down resistor is connected to the negative output terminal of the driving sub-circuit, and the other end is grounded, so as to limit the input voltage of the negative input terminal of the motor.
3. The detection circuit according to claim 1, wherein: The detection circuit further includes a decoupling capacitor, which includes a first decoupling capacitor and a second decoupling capacitor. The first decoupling capacitor is connected in parallel to the first voltage-dividing resistor, and the second decoupling capacitor is connected in parallel to the second voltage-dividing resistor.
4. The detection circuit according to claim 1, characterized in that: The detection circuit also includes an operational amplifier output interface, an operational amplifier acquisition subcircuit and a sampling resistor. The operational amplifier acquisition subcircuit has a non-inverting input terminal, an inverting input terminal and an operational amplifier output terminal. One end of the sampling resistor is connected to the non-inverting input terminal, and the other end is connected to the inverting input terminal, and is used to convert the output current of the negative output terminal of the driving sub-circuit into a sampling voltage. The operational amplifier acquisition sub-circuit is used to amplify the sampled voltage. The operational amplifier output interface is connected to the operational amplifier output terminal and is used to output the amplified sampling voltage.
5. The detection circuit according to claim 4, characterized in that: The detection circuit includes a controller, which is used to determine the state of the motor. The controller includes an input and output interface, and the input and output interface includes a first input and output interface, a second input and output interface, and a third input and output interface. The first input and output interface is connected to the positive output detection interface of the motor, the second input and output interface is connected to the negative output detection interface of the motor, and the third input and output interface is connected to the op amp output interface.
6. The detection circuit according to claim 5, characterized in that: The controller also includes a logic judgment unit and a control unit. The logic judgment unit is used to judge the state of the motor according to the physical quantity of the input and output interface, and the control unit is used to control the start and stop of the motor according to the state. The state includes the short-circuit power state of the motor input terminal, the short-circuit ground state of the motor input terminal, the open circuit state of the motor input terminal and the normal state of the motor.
7. The detection circuit according to claim 6, characterized in that: The controller is a single chip microcomputer, and the single chip microcomputer is used to clamp the voltage of the motor output detection interface.
8. A motor detection device, characterized in that: The motor detection device includes the motor detection circuit according to any one of claims 1 to 7.