A three-phase nine-switch double synchronous motor time-sharing control inverter and control method

Abstract

The invention discloses a three-phase nine-switch dual-synchronous motor time-sharing control inverter and a control method thereof. A direct torque method is used to obtain a flux linkage, a torque and a flux linkage angle of a dual-permanent-magnet synchronous motor, switching state vector division sectors of two three-phase permanent magnet synchronous motors are obtained, four directions of torque increase, torque reduction, flux linkage increase and flux linkage decrease can be divided according to sector positions and according to motor rotors of different times, thus bridge arm switch on and off states in different directions can be obtained, the voltage vector tables of the three-phase permanent magnet synchronous motors are obtained by direct torque control, the switching states of the bridge arms are selected through a weight function to control the two three-phase permanent magnet synchronous motors, selection switches can independently control the input of PWM signals of different odd and even times into the inverter, and the time-sharing operation of the two three-phase permanent magnet synchronous motors is achieved. According to the method, the control is simple andclear.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a three-phase nine-switch double synchronous motor time-sharing control inverter and a control method. Background technique [0002] In recent years, with the rapid development of industries such as textiles, papermaking, steel rolling and rail transit, multi-motor drive time-sharing control systems have attracted the attention of many scholars. In a general multi-motor drive time-sharing control system, each three-phase motor is independently controlled by a three-phase inverter, which cannot realize the time-sharing control of dual permanent magnet synchronous motors, and the control method is complicated, and the number of switching devices is large. , so there is an urgent need for a new multi-motor drive control structure for multi-phase inverters. When controlling multiple motors at the same time, the traditional vector control depends on whether the mathe...

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Problems solved by technology

In a general multi-motor drive time-sharing control system, each three-phase motor is independently controlled by a three-phase inverter, which cannot realize the time-sharing control of dual permanent magnet synchronous motors, and the control method is complicated, and the number of switching devices is large. , so there is an urgent need for a new multi-motor drive control structure for multi-phase inverters. When controlling multiple motors at the same time, the traditional vector control depends on whether the mathematical model of the asynchronous motor can be simplified. It is necessary to combine the AC motor with the DC The motor is compared, equivalent, and converted, that is, the control of the DC motor needs to be imitated

Complex control process

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