Fault-tolerant control method for open-circuit fault of permanent magnet synchronous motor

Abstract

The invention discloses a fault-tolerant control method for an open-circuit fault of a permanent magnet synchronous motor, and belongs to the technical field of fault control of the permanent magnet synchronous motor, and the method specifically comprises the steps: 1, collecting an open-circuit signal of the permanent magnet synchronous motor in real time, and obtaining a quadrature-axis current reference value iq through a rotating speed PI regulator when the open-circuit signal of the permanent magnet synchronous motor is obtained; step 2, according to a magnetomotive force invariant principle, obtaining a relation between residual phase current and quadrature-direct axis current in a fault state; 3, taking the minimum copper loss of the stator winding as a constraint condition, and obtaining a relation between a direct-axis current reference value and a quadrature-axis current reference value; 4, obtaining a switching signal, and controlling the inverter according to the obtained switching signal; according to the invention, the motor can operate stably when the open-circuit fault of the stator winding occurs, and the copper loss of the motor is reduced; moreover, the method is small in calculation amount, is easy to achieve, and can effectively improve the safety and reliability of the permanent magnet synchronous motor.

Description

technical field [0001] The invention belongs to the technical field of fault control of permanent magnet synchronous motors, in particular to a fault-tolerant control method for open circuit faults of permanent magnet synchronous motors. Background technique [0002] The permanent magnet synchronous motor has the advantages of simple structure, small size, light weight and reliable operation. Widely used in various fields of aerospace, national defense, industrial and agricultural production and daily life. The wide use of motors has higher requirements for the stable operation of the motors. It is necessary for the motors to have the ability to continue to operate stably under fault conditions, that is, when a certain fault occurs in the motor, the internal adjustment of the system can be used to maintain the stability of the motor. run. The open circuit of the stator winding of the motor is one of the common faults. In the case of an open circuit fault of the stator wind...

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Problems solved by technology

However, there have been no reports in the literature on how to minimize the copper loss of the motor while maintaining stable operation due to stator winding open circuit faults.

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