Multi-direct-current motor series system and torque control method

Abstract

The invention discloses a multi-direct-current motor series system and a torque control method. The method comprises steps of employing n position sensors to detect the motor rotor positions of n direct-current motors, obtaining the actual rotating speeds of the n direct-current motors through the calculation of the rotating speeds, comparing the actual rotating speeds with n reference rotating speeds, and obtaining reference current values of the n direct-current motors through the output of a PI controller; obtaining n+1 reference torques through a reference torque calculation module; detecting transient current values of the n direct-current motors, and processing the transient current values of the n direct-current motors through an actual torque calculation module to obtain n+1 actualtorque values; comparing the calculated n+1 actual torques with n+1 reference torques, then transmitting the signals to n+1 hysteresis controllers to generate n+1 output signals, and generating 2n+2paths of PWM signals through a PWM module; inputting 2n+2 paths of PWM signals, and driving the (n+1)-phase voltage type inverter so that the motor is further driven to realize torque control. The method is advantaged in that the circuit structure can be simplified, cost is saved, the optimized torque control effect is realized, and stability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of multi-DC motor control, and in particular relates to a multi-DC motor series system and a torque control method. Background technique [0002] With the development of production technology, higher requirements are put forward for the speed regulation accuracy, speed regulation range, static characteristics, dynamic response and torque ripple of DC motors. The control strategy based on the steady-state model can no longer meet the high-precision process requirements. In order to improve the dynamic performance, the control strategy must rely on the dynamic mathematical model of the motor. The most ideal control method is to control the torque and excitation components of the motor at the same time. That is to use the idea of ​​decoupling to decompose the complex speed control system into torque ring and magnetic linkage ring. [0003] However, this idea relies too much on the mathematical model of the m...

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Problems solved by technology

[0003] However, this idea relies too much on the mathematical model of the motor and is easily affected by the parameters of the motor

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