A hysteresis-loop fault-tolerant control method and control system for four DC motors connected in parallel

Abstract

The invention discloses a hysteresis-loop fault-tolerant control method and a control system for parallel connection of four DC motors. The control method comprises that the current value at the output terminal of a five-phase voltage source type fault-tolerant inverter undergoes current reconstruction, fault detection and a fault-tolerant control module. Obtain the calculated current value, judge whether the four direct current motors break down according to the calculated current value, if break down, make the reference current value of the broken direct current motor set to 0; the control system includes a direct current motor set in parallel, a PI controller , Reference current reconstruction module, hysteresis comparator, PWM module, five-phase voltage source type fault-tolerant inverter, current reconstruction, fault detection and fault-tolerant control module, speed calculation module, position sensor and current detection sensor. The control method and the control system of the present invention judge whether there is a faulty motor in the system through fault detection, and turn off the bidirectional thyristor of the faulty motor through the control signal to ensure normal operation of the equipment and improve the fault tolerance of the system.

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...

AI Technical Summary

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.

Images