Permanent magnet motor detection method and device, readable storage medium and permanent magnet motor

A technology of permanent magnet motor and detection method, applied in the detection of permanent magnet motor and the field of permanent magnet motor, can solve the problems of poor safety and reliability, burnt permanent magnet motor, and the demagnetization of permanent magnet cannot be monitored, etc., to improve reliability. performance, improve accuracy, and avoid demagnetization and overheating damage or even fire.

Pending Publication Date: 2022-07-22
CHONGQING MIDEA GENERAL REFRIGERATING EQUIP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the permanent magnet in the permanent magnet motor has the problem of demagnetization. If the demagnetization range is too large, it will affect the normal operation of the permanent magnet motor, and even burn the permanent magnet motor.
[0003] In related technologies, the permanent magnet hidden inside the permanent magnet motor cannot be directly detected, and the demagnetization of the permanent magnet cannot be monitored, so that the risk of the permanent magnet motor cannot be checked, and the technical problems of poor safety and reliability

Method used

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  • Permanent magnet motor detection method and device, readable storage medium and permanent magnet motor
  • Permanent magnet motor detection method and device, readable storage medium and permanent magnet motor
  • Permanent magnet motor detection method and device, readable storage medium and permanent magnet motor

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Effect test

Embodiment 1

[0100] like figure 1 As shown, the embodiment of the first aspect of the present application provides a detection method for a permanent magnet motor, the permanent magnet motor includes a permanent magnet, and the detection method for the permanent magnet motor includes:

[0101] Step 102, after the power supply to the permanent magnet motor is stopped, the rotor on the permanent magnet motor keeps rotating under the action of inertia, and in this process, the rotor speed of the permanent magnet motor is obtained, and the input voltage of the permanent magnet motor is obtained at the same time;

[0102] Step 104: Determine the demagnetization parameters of the permanent magnets in the permanent magnet motor according to the rotor speed and the input voltage.

[0103] The present application proposes a detection method for a permanent magnet motor. A permanent magnet motor includes a rotor in which permanent magnets are mounted to provide excitation by the permanent magnets. ...

Embodiment 2

[0147] like Figure 7 As shown, in the embodiment of the second aspect of the present application, a specific work flow is proposed, wherein each work step is as follows:

[0148] Step 702, receiving a shutdown instruction;

[0149] Step 704, the output of the drive inverter is powered off;

[0150] Step 706, detecting the input current output by the frequency converter to the permanent magnet motor;

[0151] Step 708, determine whether the input current is less than or equal to the fourth threshold;

[0152] Wherein, if the judgment result is yes, execute step 710 and step 712, and if the judgment result is no, execute step 706;

[0153] Step 710, measure the input voltage of the permanent magnet motor;

[0154] Step 712, measure the rotor speed of the permanent magnet motor;

[0155] Step 714, determine the current magnetic field strength and current temperature of the permanent magnet;

[0156] Step 716, calculate the magnetic field attenuation parameter;

[0157] St...

Embodiment 3

[0164] like Figure 8 As shown, the embodiment of the third aspect of the present application proposes a detection device 800 for a permanent magnet motor. The detection device 800 for a permanent magnet motor includes: an acquisition module 802, which is used for, after stopping power supply to the permanent magnet motor, The rotor keeps rotating under the action of inertia, in this process, the rotor speed of the permanent magnet motor is obtained, and the input voltage of the permanent magnet motor is obtained at the same time; the determination module 804 determines the demagnetization of the permanent magnet inside the permanent magnet motor by the rotor speed and the input voltage parameter.

[0165] The present application proposes a detection device 800 for a permanent magnet motor. A permanent magnet motor includes a rotor in which permanent magnets are mounted to provide excitation by the permanent magnets.

[0166] In the related art, the permanent magnets that pr...

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PUM

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Abstract

The invention provides a permanent magnet motor detection method and device, a readable storage medium and a permanent magnet motor. The detection method comprises the steps of obtaining an input voltage and a rotor rotating speed of the permanent magnet motor under the condition that the permanent magnet motor is shut down and a rotor keeps rotating; and determining a demagnetization parameter of the permanent magnet according to the input voltage and the rotor speed. The invention provides a detection method of a permanent magnet motor. The permanent magnet motor includes a rotor in which a permanent magnet is mounted to provide excitation through the permanent magnet. By limiting the detection method, a user can know the current demagnetization condition of the permanent magnet according to the demagnetization parameter of the permanent magnet detected by the detection method; therefore, a user can be guided to check the risk caused by the demagnetization of the permanent magnet of the permanent magnet motor by maintaining or replacing the permanent magnet before the demagnetization amplitude of the permanent magnet affects the normal work of the permanent magnet motor.

Description

technical field [0001] The present invention relates to the technical field of motors, and in particular, to a detection method, device, readable storage medium and permanent magnet motor of a permanent magnet motor. Background technique [0002] At present, in order to improve the efficiency of the motor and achieve high speed, more and more permanent magnet motors are applied to the industrial and civil fields. However, the permanent magnets in the permanent magnet motor have demagnetization problems. If the demagnetization amplitude is too large, it will affect the normal operation of the permanent magnet motor, and even burn the permanent magnet motor. [0003] In the related art, the permanent magnet hidden inside the permanent magnet motor cannot be directly detected, and the demagnetization of the permanent magnet cannot be monitored, so that the permanent magnet motor has technical problems that the risk cannot be checked, and the safety and reliability are poor. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14G01R33/12G01R31/34
CPCH02P21/14G01R33/1215G01R31/346
Inventor 李镇杉吴文辉贺伟衡
Owner CHONGQING MIDEA GENERAL REFRIGERATING EQUIP
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