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Multi-motor connection system and current hysteresis control method

A technology of current hysteresis and control method, which is applied in the direction of motor control, current controller, multiple motor speed/torque control, etc., can solve the problems of low reliability, serious torque ripple, complex control, etc., and achieve improved The effects of control accuracy and stability, fast current response speed, and simple hardware circuit

Active Publication Date: 2020-09-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Embodiment Construction

[0058] In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

[0059] see figure 1 , the present invention provides a multi-motor connection system, comprising:

[0060] Speed ​​adjustment module: adjust the difference between the reference speed and the actual speed.

[0061] Current adjustment module: adjust the difference between the reference current value and the calculated current value...

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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...

Claims

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Application Information

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IPC IPC(8): H02P6/04H02P6/28
CPCH02P6/04H02P2006/045H02P2205/01H02P6/28
Inventor 张守旭崔荣鑫严卫生王银涛李俊兵房新鹏左磊林海
Owner NORTHWESTERN POLYTECHNICAL UNIV
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