Multi-motor connection system and current hysteresis control method

Abstract

The invention discloses a multi-motor connection system and a current hysteresis control method, and the method comprises the steps: obtaining four current values through four PI regulators accordingto the difference between a given reference rotating speed and an actual rotating speed; enabling the four current values to pass through a reference current reconstruction module to obtain a requiredreference current value; enabling the current value of the output end of the inverter to pass through a current reconstruction module to obtain a calculated current value; giving the difference valuebetween the calculated current value and the reference current value to a hysteresis comparator, and generating square wave signals with equal amplitude and unequal width; converting the square wavesignal into a switching signal for driving an IGBT through a PWM module; transmitting PWM signals to s five-phase voltage source type inverter module, enabling the five-phase voltage source type inverter module to control the four-direct-current motor to work normally, and achieving four-quadrant operation of the motor. The invention provides a novel four-direct-current motor parallel control method by adopting a reference current reconstruction technology, a current reconstruction technology and a hysteresis comparison technology.

Description

technical field [0001] The invention belongs to the technical field of DC motor control, and in particular relates to a multi-motor connection system and a current hysteresis loop control method. Background technique [0002] With the introduction of the national environmental protection concept and the rapid development of the electric vehicle industry, there are many researches on the electric vehicle motor drive system at home and abroad, mainly focusing on the application of new motors and the improvement of the control strategy of the motor drive system. [0003] At present, electric vehicles mostly use DC brush motors, induction motors, switched reluctance motors and DC brushless motors. The DC brushed motor is controlled by a chopper, which has excellent electromagnetic torque control characteristics, simple control, and mature technology. Due to the existence of brushes and commutators, its high-speed performance and operational reliability are affected. As the driv...

AI Technical Summary

Problems solved by technology

As the drive motor of electric vehicles, the induction motor has low cost, good reliability, wide speed range, relatively mature controller, relatively hot manufacturing technology, small torque fluctuation, low noise, no need for position sensor but complicated control, and is easily affected by the motor. Effect of parameter and load changes

As the drive motor of electric vehicles, switched reluctance motors have good reliability, low cost, simplicity, and high-speed potential, but the motor has high noise and severe torque ripple, which has advantages and disadvantages in electric vehicle drive applications. less

As the driving motor of electric vehicles, brushless DC motor has compact structure, light weight, high efficiency and good control performance, but there are problems of torque ripple and low reliability under high current

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