Permanent magnet synchronous motor turn-to-turn short circuit fault diagnosis method based on magnetic field distribution monitoring

Abstract

The invention discloses a permanent magnet synchronous motor turn-to-turn short circuit fault diagnosis method based on magnetic field distribution monitoring. The method is characterized by, to begin with, in the steady state, carrying out analysis on an equivalent circuit obtained when the permanent magnet synchronous motor has turn-to-turn short circuit fault, and obtaining a series of diagnosis steps; and through the diagnosis steps, judging whether the motor has the turn-to-turn short circuit fault by utilizing a high-frequency component of stator tooth magnetic flux.

Description

technical field [0001] The invention relates to motor fault diagnosis technology. Background technique [0002] Permanent magnet synchronous motors have many significant advantages such as simple structure, no brushes and slip rings, no electric excitation system, high operational reliability, high power density, and flexible shapes and sizes of motors. In line with the economic development needs of energy saving and emission reduction, it can not only partially replace the traditional electric excitation motor, but also achieve high efficiency that is difficult for electric excitation motors to achieve. Therefore, permanent magnet synchronous motors have been widely used in aerospace, numerical control machine tools, electric vehicles, robots and other fields. [0003] Due to the wide range of applications of permanent magnet synchronous motors and the harsh working environment, various failures of permanent magnet motors are inevitable. Common faults of permanent magnet ...

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Problems solved by technology

Although significant progress has been made in this area, the high misjudgment rate and low accuracy are still a real problem

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