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Method and device for detecting demagnetization of rotor of permanent magnet synchronous motor

A technology for permanent magnet synchronous motors and detection methods, which is applied in the direction of controlling electromechanical transmission devices, controlling generators, motor generators, etc., can solve the problems of large amount of calculation and difficult implementation of single-chip microcomputers, and achieve small amount of calculation, easy implementation, The effect of high detection accuracy

Active Publication Date: 2014-07-30
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology

The second scheme is to obtain the rotor demagnetization information by wavelet analysis of the motor phase current, so that the number of demagnetized permanent magnets can be judged. However, the calculation amount of this method is too large to be implemented on a single-chip computer.

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  • Method and device for detecting demagnetization of rotor of permanent magnet synchronous motor
  • Method and device for detecting demagnetization of rotor of permanent magnet synchronous motor
  • Method and device for detecting demagnetization of rotor of permanent magnet synchronous motor

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Embodiment Construction

[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicat...

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Abstract

The invention discloses a method and device for detecting demagnetization of a rotor of a permanent magnet synchronous motor. The method for detecting the demagnetization of the rotor of the permanent magnet synchronous motor includes the following steps of detecting three-phase current and three-phase voltage of the permanent magnet synchronous motor, estimating the magnetic flow of the rotor of the permanent magnet synchronous motor according to a magnetic flow model of the motor, the three-phase current and the three-phase voltage, obtaining an estimation value of the magnetic flow of the rotor, and judging whether the permanent magnet synchronous motor is at a rotor demagnetization state or not according to the estimation value of the magnetic flow of the rotor. By the method and device for detecting the demagnetization of the rotor of the permanent magnet synchronous motor, the demagnetization fault of the rotor of the permanent magnet synchronous motor can be detected in real time, a system is protected when the rotor is demagnetized, overcurrent operation of the permanent magnet synchronous motor due to the demagnetization of the rotor can be avoided, overheating and / or variable frequency driver failure caused later can be avoided, the permanent magnet synchronous motor and a variable frequency driver are effectively protected, the operation amount is small, and operation can be easily implemented on a single-chip microcomputer.

Description

technical field [0001] The invention relates to the technical field of synchronous motors, in particular to a method for detecting rotor demagnetization of a permanent magnet synchronous motor and a detection device for rotor demagnetization of a permanent magnet synchronous motor. Background technique [0002] Due to the advantages of large power inertia ratio, high efficiency and wide speed regulation range, permanent magnet synchronous motors have been more and more widely used in recent years. The permanent magnet synchronous motor rotor is equipped with permanent magnets, so the rotor magnetic field can be generated without external excitation, thereby avoiding the loss caused by the excitation of the rotor magnetic field. [0003] However, when the permanent magnet synchronous motor works in a harsh environment, demagnetization may occur. For example, when the motor with ferrite as the rotor permanent magnet works at too low temperature, or the motor with rare earth m...

Claims

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Application Information

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IPC IPC(8): H02P21/14
Inventor 张国柱
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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