A dual direct current motor forward series control system and method

Abstract

The invention discloses a forward serial connection control system and method of a double DC motor. Six IGBT modules are connected in series pairwise to form three bridge arms, the three bridge arms are connected in parallel between anode and cathode of a DC power supply, the double DC motor for forward serial connection is connected with the three bridge arms in series, and passes a speed sensor,a current sensor and a speed regulation module successively and then connected with a reference voltage combiner via a two-stage PI controller, the reference voltage combiner is connected with a three-phase inverter via a PWM pulse generation unit, the three-phase inverter is connected with the reference voltage combiner via a current regulation module and one-stage PI controller, the PWM pulse generation unit is connected via the reference voltage combiner, and pulse control signals generated by the PWM pulse generation unit are used to control ON / OFF of the six IGBT modules and further drive operation of the double-DC motor. The system and method can be realized by modifying a serial connection method of an existing or future double-DC motor, the method is suitable for different serialdriving systems of the double-DC motor, realization is simple, and the application range is wide.

Description

technical field [0001] The invention belongs to the technical field of motor control, and in particular relates to a forward series control system and method of double DC motors. Background technique [0002] With the development of control theory, computer level and motor technology manufacturing level, motors are more and more widely used in household appliances, electric vehicles and other industrial fields, and DC motors are more energy-saving and efficient than AC motors, and more and more The development and design all use DC motors. In specific applications, the DC motor should realize four motion states: forward electric, reverse electric, forward feedback braking and reverse feedback braking. Reversing the electromagnetic torque is generally referred to as the four-quadrant control of the DC motor. [0003] The dual-motor drive system has the advantages of low voltage, high power output, high power density, suitable for fault-tolerant operation, etc., so it has be...

AI Technical Summary

Problems solved by technology

Therefore, a dual DC forward series motor system is proposed. However, in the series connection, there will be one more set of IGBT bridge arms to control the operation of the motor than the single DC motor. It is necessary to realize the synthesis of two reference voltage values ​​into three reference voltages. How to Synthesizing becomes the key to effectively control the dual DC series operation. In addition, when adjusting the PWM of the steady-state voltage, since the value of the sine wave at different phase angles is different, the pulse width obtained by intersecting the triangular wave is also different; when the sine wave When the frequency or amplitude changes, the width of each pulse will also change. To accurately generate the PWM waveform, it is necessary to accurately calculate the intersection point of the sine wave and the triangular wave. However, this method is difficult to calculate and is not suitable for solving. real-time system

Images