A fault-tolerant control system and control method for a series system of four DC motors

Abstract

The invention discloses a fault-tolerant control system and a control method of a four-DC motor series system. The current value of the output terminal of the five-phase voltage source type fault-tolerant inverter module is used to reconstruct the actual current, the fault detection and the fault-tolerant control module to judge the four Whether the DC motor fails, and set the reference torque value of the corresponding motor to zero; the reference torque of the motor is calculated by the difference between the reference speed and the actual speed through the PI regulator and the reference torque calculation module; the calculated torque The difference between the torque and the reference torque is given to the hysteresis comparator module, and then the output voltage of the hysteresis comparator is given to the PWM module to generate a control signal that can drive the working bridge arm of the inverter and give it to the corresponding On the bidirectional thyristor, if the motor fails, the corresponding bidirectional thyristor is turned off, so that the flow torque is zero, and the pulsation of its electromagnetic torque is output at a minimum, ensuring the normal operation of the other motors in the system, improving the control performance, and realizing the protection of the motor system .

Description

technical field [0001] The invention belongs to the technical field of DC motor fault-tolerant control, and in particular relates to a fault-tolerant control system and a control method of a series system of four DC motors. Background technique [0002] Direct torque fault-tolerant control has the characteristics of instantaneous torque control, and realizes direct control of motor torque; traditional direct torque fault-tolerant control uses more zero-voltage vectors continuously at low speed, which makes the switching frequency very low and the torque ripple large , it is impossible to obtain a more accurate mathematical model of the diagnosed object, and the robustness is poor; the fault diagnosis method based on the mathematical model is inaccurate and has a lot of interference. Fault diagnosis is also a difficult point. [0003] At the same time, due to the high power and high energy density of the power switch tube on the working bridge arm of the inverter, the failur...

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Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the object of the present invention is to provide a fault-tolerant control system and control method for a series system of four DC motors, so as to solve the problems in the prior art that the torque ripple is large and accurate fault diagnosis cannot be realized, and the working inefficient technical issues

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