Five-phase inverter with dual three-phase motors and control method of five-phase inverter

Abstract

The invention discloses a five-phase inverter with dual three-phase motors and a control method of the five-phase inverter. The control method comprises the steps of performing speed adjustment on actual rotational speeds of the two motors and a given rotational speed to obtain a rotational speed error; and enabling the rotational speed error of the two three-phase motors to pass through a PI controller to obtain a given current of the two three-phase motors, enabling the obtained given current to pass through a reference current generator to obtain a reference current of the two three-phase motors, enabling the reference current and the actual current to pass through a current adjustment module to obtain a current error, sending the current error in a phase winding connected with each independent bridge arm to a hysteresis controller, allowing a signal generated by the hysteresis controller to pass through a PWM generation unit so that control of the two three-phase motors by the PWMgeneration unit is achieved, synchronous driving of the two motors at the same rotational speed is achieved, and synchronous driving of the two motors at different rotational speed also can be achieved. The control method is suitable for various different types of three-phase AC motors, has the advantages of simple algorithm, rapid response and high accuracy, is simple to implement and is wide inapplication range.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a five-phase inverter for a dual-three-phase motor and a control method. Background technique [0002] In recent years, with the higher demand of social life and industrial production, motor control systems are widely used in papermaking, transportation, electric vehicles, washing machines, air conditioners and other home appliances. Compared with the conventional single-motor drive system, the dual-motor system can eliminate the transmission gap and share the load by controlling the output torque of the two motors. Since the dual-motor drive system can share the load, the output power of the single-motor drive system can be effectively reduced. Therefore, the multi-phase motor drive system has the characteristics of low voltage, high power output, high power density, small torque fluctuation, suitable for fault-tolerant operation, etc., and has received extensive attentio...

AI Technical Summary

Problems solved by technology

The traditional dual-motor drive system mostly uses a twelve-switch six-arm inverter topology. Although the system with this structure has better control performance, the hardware cost of the system is relatively high.

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