Four-direct-current-motor parallel current hysteresis fault-tolerant control method and control system

Abstract

The invention discloses a four-direct-current motor parallel current hysteresis fault-tolerant control method and a control system. The control method comprises steps that a current of an output end of a five-phase voltage source type fault-tolerant inverter is subjected to a current reconstruction, fault detection and fault-tolerant control module to obtain a calculated current value, whether four direct-current motors break down or not is judged according to the calculated current value, if the four direct-current motors break down, a reference current value of the broken-down direct-currentmotors is set to be zero, and a control system comprises a direct current motor, a PI controller, a reference current reconstruction module, a hysteresis comparator, a PWM module, a five-phase voltage source type fault-tolerant inverter, a current reconstruction, fault detection and fault-tolerant control module, a rotating speed calculation module, a position sensor and a current detection sensor which are arranged in parallel. The control method is advantaged in that whether the system has the faulty motor or not is judged through fault detection, a bidirectional thyristor of a faulty motoris turned off through a control signal, normal operation of equipment is guaranteed, and the fault-tolerant capability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of DC motor fault-tolerant control, and in particular relates to a current hysteresis-loop fault-tolerant control method and a control system of four DC motors connected in parallel. Background technique [0002] In recent years, the country has paid more and more attention to environmental protection issues. With the development of society, the number of private cars is increasing, which has a great impact on the environment. The emergence of electric vehicles has effectively solved environmental problems. The research on electric vehicle motor drive mainly focuses on the application of new motors and the improvement of the control strategy of the motor drive system. At present, electric vehicles mostly use DC brush motors, induction motors, switched reluctance motors and DC brushless motors. Since DC motor technology is well established, most electric vehicles use DC motors. Because electric vehicles wi...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a hysteresis-loop fault-tolerant control method and control system for the parallel connection of four DC motors, so as to solve the technical problem in the prior art that the equipment cannot work normally when the DC motor fails.

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