Fault control method and system of permanent magnet motor system

Abstract

The invention discloses a fault control method of a permanent magnet motor system. The fault control method comprises the steps that when a (train control and management system) TCMS judges that a (traction control unit) TCU state is abnormal, the TCMS and / or the TCU sends an isolation command to each isolation circuit corresponding to the TCU; each isolation circuit receives the isolation commandand disconnects the electrical connection between the TCU and the corresponding permanent magnet motor, wherein the first end of the isolation circuit is connected with the TCU for each isolation circuit, and the second end is connected with a permanent magnet motor corresponding to the isolation circuit. By applying the method provided by the invention, a condition that the permanent magnet motor, used as an uncontrollable generator, inputs electric energy to a main circuit system when the main transmission system is in a fault can be avoided, and then faults of the main transmission systemare avoided. The invention further discloses a fault control system of the permanent magnet motor system, and the fault control system has the corresponding technical effect.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to a fault control method and system for a permanent magnet motor system. Background technique [0002] When the permanent magnet motor is used in the traction system of an electric locomotive, since the excitation inside the permanent magnet motor is a magnetic circuit formed by its own permanent magnet, the magnetic field of the motor always exists. This leads to failure of the main drive system and the terminal voltage of the motor is no longer controlled by the output voltage of the inverter. If the electric locomotive is still running, the rotor of the permanent magnet motor rotates and cuts the magnetic flux line, which will part to form the terminal voltage. At this time, the permanent magnet motor will act as a generator to generate electricity, and the voltage at the end of the motor due to the failure of the main drive system is not controlled by the inverter, and th...

AI Technical Summary

Problems solved by technology

At this time, the permanent magnet motor will act as a generator to generate electricity, and the voltage at the end of the motor due to the failure of the main drive system is not controlled by the inverter, and the permanent magnet motor will act as an uncontrollable generator to input to the main circuit system. Electric energy, which in turn will bring unpredictable risks and unpredictable failures to the main circuit system

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