A permanent magnet synchronous motor stator and rotor concentricity detection device

Abstract

The utility model relates to permanent magnet synchronous motor technical field, specifically disclose a kind of permanent magnet synchronous motor stator rotor concentricity detection equipment, including permanent magnet synchronous motor, rotary transformer sensor, motor controller, alarm lamp and high-voltage direct current power supply, rotary transformer sensor is installed in the rotor side of permanent magnet synchronous motor, wherein, high-voltage direct current power supply is electrically connected with motor controller, motor controller is electrically connected with permanent magnet synchronous motor by high-voltage three-phase transmission line, rotary transformer sensor is electrically connected with motor controller by signal line, alarm lamp and motor controller are electrically connected;High-voltage direct current power supply provides driving energy to motor controller, and motor controller can convert direct current bus voltage into three-phase alternating current to drive permanent magnet synchronous motor operation.The permanent magnet synchronous motor stator rotor concentricity detection equipment provided by the utility model not only improves the precision of measurement, but also simplifies the detection process, with more extensive applicability and higher efficiency.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet synchronous motor technology, and more specifically, to a device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor. Background Technology

[0002] Due to manufacturing and installation reasons, permanent magnet synchronous motors often have a certain degree of concentricity deviation between the stator and rotor. This deviation will lead to uneven distribution of the air gap space inside the motor, which in turn affects the magnetic field distribution, electromagnetic characteristics and mechanical operation of the motor, and ultimately affects the performance and lifespan of the motor.

[0003] Currently, methods for detecting the concentricity of the stator and rotor in automotive permanent magnet synchronous motors are relatively limited. The mainstream detection techniques are primarily direct inspection, using measuring instruments or visual inspection to directly measure the center difference between the stator and rotor. Generally speaking, these methods can be categorized as follows: (1) Machine vision inspection This method primarily employs optical imaging principles to automatically acquire and process images of the rotor's motion. By observing the positional deviation between the motor rotor and stator, the detection results are automatically determined. This approach boasts a high degree of automation and can meet the requirements of motor off-line inspection, such as measurement accuracy and process cycle time. However, a drawback is that while high-precision vision inspection systems demand sophisticated process control in imaging, lighting, image processing, and inspection, the harsh environment of motor assembly workshops makes them highly susceptible to oil contamination, leading to equipment malfunctions, affecting inspection results, and incurring high maintenance costs.

[0004] (2) Testing with professional measuring instruments This method uses specialized measuring instruments to precisely measure the positional deviation between the motor rotor and stator to determine whether it meets the motor concentricity standard. This approach can also meet high-precision requirements. However, it has drawbacks: it requires manual visual inspection and judgment; different motor speeds are required depending on the measurement location; and it suffers from slow inspection cycle and poor consistency when used for offline testing. Furthermore, high-precision testing equipment is expensive and has high maintenance costs.

[0005] (3) Functional testing is adopted. This method assesses whether the motor's concentricity meets standard requirements by testing its operational performance, such as vibration and noise tests. This result-oriented method indirectly reflects the motor's concentricity level and is more suitable for qualitative analysis; however, it may lead to erroneous conclusions when the results have multiple causes. In summary, while machine vision inspection and professional measuring instruments offer high accuracy, they are costly and difficult to maintain. Functional testing, although simple to operate, is prone to misjudgment. Summary of the Invention

[0006] This invention provides a device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor, which greatly reduces cost and maintenance difficulty while maintaining high precision.

[0007] As a first aspect of this utility model, a device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor is provided. The device includes a permanent magnet synchronous motor, a resolver sensor, a motor controller, an alarm light, and a high-voltage DC power supply. The resolver sensor is installed on the rotor side of the permanent magnet synchronous motor. The high-voltage DC power supply is electrically connected to the motor controller, which is connected to the permanent magnet synchronous motor via a high-voltage three-phase transmission line. The resolver sensor is electrically connected to the motor controller via a signal line. The alarm light is electrically connected to the motor controller. The high-voltage DC power supply provides driving energy to the motor controller, which can convert the DC bus voltage into three-phase AC power to drive the permanent magnet synchronous motor.

[0008] Furthermore, the permanent magnet synchronous motor includes a soft decoding module, which is electrically connected to the resolver sensor via the signal line. The soft decoding module injects a high-frequency excitation signal into the rotor of the resolver sensor via the signal line, and then acquires and demodulates the induced voltage signal returned from the stator of the resolver sensor.

[0009] Furthermore, the software decoding module includes an MCU.

[0010] Furthermore, it also includes an oscilloscope, a first CAN tool, a second CAN tool, a monitor, a PC host, an equipment box, a motor production line, an equipment placement platform, and a barcode scanner. The oscilloscope, the first CAN tool, the second CAN tool, the motor controller, the monitor, and the PC host are all located inside the equipment box. The alarm light is located above the equipment box. The equipment box and the barcode scanner are both located on the equipment placement platform. The permanent magnet synchronous motor is placed above the motor production line. The PC host is communicatively connected to the motor controller through the first CAN tool and the second CAN tool, respectively. The barcode scanner is used to record the code of the permanent magnet synchronous motor.

[0011] The permanent magnet synchronous motor stator and rotor concentricity testing equipment provided by this utility model has the following advantages: it not only improves the accuracy of measurement, but also simplifies the testing process, and has wider applicability and higher efficiency. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof.

[0013] Figure 1 The circuit diagram of the permanent magnet synchronous motor stator and rotor concentricity detection device provided by this utility model.

[0014] Figure 2 The overall architecture diagram of the permanent magnet synchronous motor stator and rotor concentricity testing equipment provided by this utility model. Detailed Implementation

[0015] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of the permanent magnet synchronous motor stator-rotor concentricity detection device proposed according to this utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0016] This embodiment provides a device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor, such as... Figure 1 As shown, the permanent magnet synchronous motor stator-rotor concentricity detection device includes a permanent magnet synchronous motor 1, a resolver sensor 2, a motor controller 6, an alarm light 7, and a high-voltage DC power supply 10. The resolver sensor 2 is installed on the rotor side of the permanent magnet synchronous motor 1. The high-voltage DC power supply 10 is electrically connected to the motor controller 6, which is electrically connected to the permanent magnet synchronous motor 1 via a high-voltage three-phase transmission line. The resolver sensor 2 is electrically connected to the motor controller 6 via a signal line. The alarm light 7 is electrically connected to the motor controller 6. The high-voltage DC power supply 10 provides driving energy to the motor controller 6, which can convert the DC bus voltage into three-phase AC power to drive the permanent magnet synchronous motor 1.

[0017] Preferably, the permanent magnet synchronous motor 1 includes a soft decoding module, which is electrically connected to the resolver sensor 2 via the signal line. The soft decoding module injects a high-frequency excitation signal into the rotor of the resolver sensor 2 via the signal line, and then collects and demodulates the induced voltage signal returned from the stator of the resolver sensor 2.

[0018] In this embodiment, the soft decoding module includes an MCU. For example, the soft decoding module can be a parsing unit of a resolver sensor built with an MCU.

[0019] Preferably, such as Figure 2As shown, the system also includes an oscilloscope 3, a first CAN tool 4, a second CAN tool 5, a display 8, a PC host 9, an equipment box 11, a motor production line 12, an equipment placement platform 13, and a barcode scanner 14. The oscilloscope 3, the first CAN tool 4, the second CAN tool 5, the motor controller 6, the display 8, and the PC host 9 are all located inside the equipment box 11. The alarm light 7 is located above the equipment box 11. The equipment box 11 and the barcode scanner 14 are both located on the equipment placement platform 13. The permanent magnet synchronous motor 1 is placed above the motor production line 12. The PC host 9 is communicatively connected to the motor controller 6 through the first CAN tool 4 and the second CAN tool 5, respectively. The barcode scanner 14 is used to record the code of the permanent magnet synchronous motor 1.

[0020] The working principle of the permanent magnet synchronous motor stator-rotor concentricity detection device provided by this utility model is as follows: The permanent magnet synchronous motor 1 and the motor controller 6 are connected via a high-voltage three-phase (U / V / W) transmission line, and a closed-loop control link is constructed through the resolver sensor signal line. In the power supply system, the high-voltage DC power supply 10 provides driving energy to the motor controller 6; the motor controller 6 converts the DC bus voltage into three-phase AC (U / V / W) to drive the permanent magnet synchronous motor 1. During the operation of the permanent magnet synchronous motor 1, resolver soft decoding technology is adopted. Taking advantage of the conditions of the motor controller 6, the entire decoding process of the resolver sensor 2 is realized through the soft decoding module. Based on this, a high-frequency, low-voltage excitation signal is injected into the rotor of the resolver sensor 2 installed on the rotor side of the permanent magnet synchronous motor 1 through the soft decoding module in the motor controller 6. Then, the induced voltage signal returned from the stator of the resolver sensor 2 is collected and demodulated. The motor controller 6 detects the stator-rotor concentricity of the permanent magnet synchronous motor 1 by processing and comparing the amplitude of the demodulated sine and cosine signal waveforms.

[0021] It should be noted that stator-rotor eccentricity in a permanent magnet synchronous motor (PMSM) refers to the misalignment between the winding distribution center (stationary part) of the stator armature and the rotation center (rotating part) of the rotor. When the PMSM is properly assembled, the rotor's rotation axis should coincide with the stator's geometric axis. When the stator is centered and the magnetic flux density distribution in the air gap is uniform, the stator-rotor concentricity deviation is generally caused by rotor eccentricity. This invention utilizes the excitation generation and return signal acquisition process of resolver soft decoding. It uses real-time analysis of the induced voltage signal returned from the resolver sensor stator and non-real-time analysis of the demodulated sine and cosine signals to determine whether the concentricity of the tested PMSM stator-rotor meets the standard. Taking radial eccentricity as an example, the fixed variation in the air gap between the PMSM stator and rotor will cause electrical zero-position error in the motor, manifested as a periodic amplitude wave characteristic in the output sinusoidal current signal. Based on this characteristic, when the peak-to-peak value of the sinusoidal signal exceeds the calibration parameters, a rotor eccentricity problem is determined. The formula is as follows: , , in, It is the voltage value of the demodulated sine wave signal. It is the voltage value of the demodulated cosine signal. It's voltage. G This refers to the amplitude variation coefficient generated during signal demodulation. This is the amplitude offset coefficient of the sinusoidal signal caused by electrical zero-position error due to stator and rotor eccentricity. This is the amplitude offset coefficient of the cosine signal caused by electrical zero-position error due to stator and rotor eccentricity.

[0022] like Figure 1-2 As shown, the experimental process of the permanent magnet synchronous motor stator and rotor concentricity testing equipment provided by this utility model is as follows: ① Start the high voltage DC power supply 10 to power the motor controller 6. Use the PC host 9 to enable the motor controller 6 to complete the power-on initialization check through the first CAN tool 4. The soft decoding module injects a high frequency excitation signal into the rotor of the resolver sensor 2 through the resolver low voltage harness, and collects and demodulates the induced voltage signal returned from the stator of the resolver sensor 2. ② Use barcode scanner 14 to record the code of permanent magnet synchronous motor 1; ③The PC host 9 controls the motor controller 6 online through the first CAN tool 4, so that the motor controller 6 enters the working mode and controls the permanent magnet synchronous motor 1 to enter the speed closed loop, so that the permanent magnet synchronous motor 1 stabilizes at 2000rpm; ④ The PC host 9 controls the oscilloscope 3 to acquire the induced voltage signal returned by the stator of the resolver sensor 2. The PC host 9 records the single-channel sin / cos carrier waveform in real time and saves the log waveform data. The display 8 displays the single-channel sin / cos carrier waveform in real time. ⑤ The PC host 9 performs online measurement and observation of the motor controller 6 through the second CAN tool 5, and records the envelope signal obtained by the soft decoding module from the demodulated induced voltage signal to form a record file and save it; ⑥ The software decoding module calculates the envelope signal. When the zero-position voltage value exceeds the calibration deviation, the alarm light 7 is controlled by the motor controller 6 to sound an alarm.

[0023] The present invention provides a device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor, which not only improves the accuracy of measurement but also simplifies the detection process, and has wider applicability and higher efficiency.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor, characterized in that, The permanent magnet synchronous motor stator-rotor concentricity detection device includes a permanent magnet synchronous motor (1), a resolver sensor (2), a motor controller (6), an alarm light (7), and a high-voltage DC power supply (10). The resolver sensor (2) is installed on the rotor side of the permanent magnet synchronous motor (1). The high-voltage DC power supply (10) is electrically connected to the motor controller (6). The motor controller (6) is electrically connected to the permanent magnet synchronous motor (1) through a high-voltage three-phase transmission line. The resolver sensor (2) is electrically connected to the motor controller (6) through a signal line. The alarm light (7) is electrically connected to the motor controller (6). The high-voltage DC power supply (10) provides driving energy to the motor controller (6). The motor controller (6) can convert the DC bus voltage into three-phase AC power to drive the permanent magnet synchronous motor (1) to operate.

2. The device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor according to claim 1, characterized in that, The permanent magnet synchronous motor (1) includes a soft decoding module, which is electrically connected to the resolver sensor (2) through the signal line. The soft decoding module injects a high-frequency excitation signal into the rotor of the resolver sensor (2) through the signal line, and then collects and demodulates the induced voltage signal returned from the stator of the resolver sensor (2).

3. The device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor according to claim 2, characterized in that, The software decoding module includes an MCU.

4. The device for detecting the concentricity of the stator and rotor of a permanent magnet synchronous motor according to claim 1, characterized in that, It also includes an oscilloscope (3), a first CAN tool (4), a second CAN tool (5), a display (8), a PC host (9), an equipment box (11), a motor production line (12), an equipment placement platform (13), and a barcode scanner (14). The oscilloscope (3), the first CAN tool (4), the second CAN tool (5), the motor controller (6), the display (8), and the PC host (9) are all located inside the equipment box (11). The alarm light (7) is located above the equipment box (11). The equipment box (11) and the barcode scanner (14) are both located on the equipment placement platform (13). The permanent magnet synchronous motor (1) is placed above the motor production line (12). The PC host (9) is connected to the motor controller (6) through the first CAN tool (4) and the second CAN tool (5), respectively. The barcode scanner (14) is used to record the code of the permanent magnet synchronous motor (1).

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