Five-phase inverter and double three-phase motor system driving circuit and direct torque control method

Abstract

The invention discloses a five-phase inverter and double three-phase motor system driving circuit and a direct torque control method. The system driving circuit comprises two star-winding three-phasemotors, a five-bridge arm inverter, a speed adjusting module, a PI regulator, a torque calculating module, a torque adjusting module, hysteresis controllers and a switch state selecting table. The control method adopts a torque hysteresis control way, torque errors are obtained after given torques and actual torques are adjusted by the torque adjusting module, the torque adjusting module is connected with the switch state selecting table through the hysteresis controllers, and PWM pulse width modulation signals of two motor inverters are acquired from the switch state selecting table. Advantages of the three-phase direct torque control method, such as a simple structure and strong robustness, are inherited; according to the optimized direct torque control method, the control accuracy is improved, the response speed is increased, and high-precision and fast-response control of double three-phase motors is achieved; the direct torque control method is suitable for various five-phase inverter and double three-phase motor systems.

Description

technical field [0001] The invention belongs to the field of motor control, and relates to a drive circuit for a five-phase inverter dual-three-phase motor system and a direct torque control method. Background technique [0002] In recent years, with the rapid development of industries such as textiles, papermaking, steel rolling and rail transit, the optimization of multi-motor drive systems and their control methods has attracted the attention of many scholars. In a general multi-motor drive system, each three-phase motor is independently controlled by a three-phase inverter. Therefore, in order to reduce the number of switching devices used, experts proposed a new multi-motor drive control structure based on multi-phase inverters. For example, adopt five-phase inverter to control the basic structure of the system at the same time. [0003] At the same time, a new AC speed regulation technology -------- direct torque control technology (DTC) has also been born in the fie...

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Problems solved by technology

According to the magnitude of the torque error, the product of the magnitude of the flux linkage error and the deviation coefficient, the respective system errors of the two three-phase motors are calculated, and the dual three-phase motor bridge can only be determined after comparing the system errors of the two three-phase motors. The actual switch state of the arm, the calculation process of this method is complicated, and it is difficult to respond quickly

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