Application of Dual Motor Control Algorithm Based on svpwm Variable Frequency Speed Regulation
With the development of industrial technology, there are more and more occasions in the aviation, military, and mechanical manufacturing fields that require multiple motors to simultaneously drive one or more working components for coordinated control. The traditional control system uses a single motor to achieve single-axis control. The output torque of the motor has certain limits. When the transmission system requires a large driving power, the drive motor and driver must be specially matched with the power to make the system Cost increases, and motors with excessive output power are affected by the manufacturing process and motor performance. The development of high-power drivers is also limited by semiconductor power devices [1]. The motor follows the same target speed in real time. It is also necessary to keep the speeds of the two motor motors synchronized, otherwise the accuracy of the subsequent mechanical transmission will be degraded. The solution to the above problem is to use multiple motors to control it, but the synchronization between multiple motors directly affects the production efficiency and product quality. Therefore, the research on multi-motor synchronous control has very important practical significance [2].
In this paper, a simulation model of dual motor deviation coupling control algorithm based on svpwm variable frequency speed regulation is established, and simulation is carried out with Matlab7.1 simulation software. The simulation results are analyzed and compared.
2. Space vector pulse width modulation
The use of pulse width modulation (PWM) technology is the main measure for the inverter to suppress harmonics. The sinusoidal wave PWM (SPWM) technology was first adopted and has been used until now. After continuous improvement, the effect is remarkable. However, it still has shortcomings, such as low DC voltage utilization, torque ripple at low speed, high switching loss due to high carrier frequency, etc. [3]. Space vector pulse width proposed by German scholar VanDer-BroeckHW Modulation fundamentally solves the high-performance control problem of AC motor torque [4].
Its basic idea is to simulate the law of DC motor torque control on a three-phase AC motor, and decompose the stator current vector into a field current component IM that generates magnetic flux and a torque current component IT that generates torque on the magnetic field orientation coordinate. And make the two components perpendicular to each other, independent of each other, adjust separately to achieve torque control [5]. SVPWM considers the inverter and AC motor as one, focusing on how to make the motor obtain a circular rotating magnetic field to reduce the motor torque pulsation. Specifically, it is based on the ideal flux circle of the AC motor stator when the three-phase symmetrical sinusoidal voltage is supplied. When the motor is connected with a three-phase symmetrical sinusoidal voltage, a circular flux linkage is generated in the AC motor, and the SVPWM is circular magnetic. The chain is the reference, and the effective voltage vector is generated by the different switching modes of the inverter power device to approach the reference circle, that is, the polygon is used to approximate the circle, and the result of the comparison determines the inverter switching state to form a PWM wave [6]. .
