Abstract
High-speed motor is increasingly used in ultra-high precision machining and high-performance machinery. It is necessary to achieve closed-loop control of high-speed motor in order to realize high-performance motor control. The high-frequency and high-speed characteristics of high-speed motor have brought great difficulties for its realization of closed-loop control. The performance of the hexagonal flux direct torque control (DTC) method that can reduce the switching frequency of power devices is researched for high-speed synchronous motor in this paper. After adopting this control method, the harmonics in the motor current and torque can be suppressed by adopting an appropriate filtering method. The same effect as the conventional DTC can still be achieved. It provides a basis for the application realization of the high-speed synchronous motor control system.
Highlights
Due to the advantages of high speed and high power density as well as its small geometric size, the high-speed motor can effectively save materials
The simulation results show that the hexagonal flux direct torque control (DTC) method can still achieve the same effect as the conventional DTC, which provides a theoretical basis for the realization of the closed-loop control for the high-speed synchronous motor
The hexagonal flux power supply can only control the power supply frequency, and the control of the power supply current can be achieved by using a chopper to change the amplitude of the voltage vector by adjusting the DC voltage
Summary
Due to the advantages of high speed and high power density as well as its small geometric size, the high-speed motor can effectively save materials. After adopting the hexagonal flux control mode, the 5th and 7th harmonic components in the motor current and torque are relatively large, and suitable filtering methods can be used to suppress them. Based on the mathematical model, simulation is done for the hexagonal flux DTC system of the high-speed synchronous motor in this paper using MATLAB. It is compared with the characteristic simulation of the conventional DTC. The simulation results show that the hexagonal flux DTC method can still achieve the same effect as the conventional DTC, which provides a theoretical basis for the realization of the closed-loop control for the high-speed synchronous motor
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