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A method and system for protection against loss of excitation of a permanent magnet synchronous motor

A technology for permanent magnet synchronous motors and loss-of-excitation protection, applied in control systems, control generators, vector control systems, etc., can solve the problems of reducing torque ripple and not fully satisfying real-time response to changes in flux linkage

Active Publication Date: 2017-12-08
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Problems solved by technology

[0005] The technical problem to be solved in this application is to provide a permanent magnet synchronous motor demagnetization protection method and system, which solves the problems in the prior art that cannot fully satisfy the real-time response to flux linkage changes and reduce torque ripple

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  • A method and system for protection against loss of excitation of a permanent magnet synchronous motor
  • A method and system for protection against loss of excitation of a permanent magnet synchronous motor
  • A method and system for protection against loss of excitation of a permanent magnet synchronous motor

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Embodiment Construction

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0041] refer to figure 1 , which shows a flow chart of an embodiment of a method for protecting a permanent magnet synchronous motor from loss of excitation according to the present application, which may include the following steps:

[0042] Step S101: Using an adaptive neural network algorithm to monitor the flux linkage amplitude of the permanent magnet.

[0043] Step S102: Determine the magnitude of the flux linkage amplitude. When the flux linkage amplitude decreases, use the ...

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Abstract

The present application provides a permanent magnet synchronous motor demagnetization protection method, the method comprising: using an adaptive neural network algorithm to monitor the magnitude of the flux linkage of the permanent magnet; judging the magnitude of the flux linkage amplitude, when the flux linkage When the amplitude of the value decreases, use the preset loss-of-excitation judgment standard to judge whether the amplitude of the stator current exceeds the maximum allowable output value of the inverter, and if so, perform the compensation of the stator current through the fuzzy control current compensation method; The method carries out maximum torque current ratio control and field weakening control. First, the adaptive neural network algorithm is used to monitor the amplitude of the permanent magnet flux linkage; then, it is judged whether the current state of the permanent magnet is in a state of demagnetization by combining the stator current; finally, the current compensation strategy based on fuzzy control is adopted to control the stator current. Within a reasonable range, this method can effectively solve the problem of permanent magnet demagnetization, so that the permanent magnet synchronous motor control system can continue to operate stably and reliably after the permanent magnet is demagnetized.

Description

technical field [0001] The present application relates to the field of permanent magnet synchronous motors, in particular to a method and system for protecting permanent magnet synchronous motors from demagnetization. Background technique [0002] With the development of technology, people have higher and higher requirements for permanent magnet synchronous motor loss protection. [0003] After the permanent magnet in the permanent magnet synchronous motor loses its magnetism, its performance will decline obviously. If the current increases, the output will be insufficient, and even the motor will not be able to drive the load and even burn out the motor. In order to ensure that the motor is controlled after the permanent magnet is demagnetized, and to prevent the system from being unstable and the motor uncontrollable caused by the demagnetization of the motor, the existing scheme can prevent the system instability caused by the demagnetization of the motor Stable and unco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
Inventor 冯江华许峻峰石敏何亚屏梅文庆肖磊刘勇文宇良
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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