Abstract. In the high power traction driving system, induction motor is widely used with its advantages of strong structure, high reliability and low cost. When the voltage source inverter is used as the driving device of the induction motor and the motor speed exceeds the rated speed, it is required to consider the limit of DC bus voltage and inverter rated current. Therefore, an appropriate field weakening control strategy is needed to reduce the rotor flux, and to enhance the output torque of the motor when induction motor operation in the filed weakening region. According to the above problems, considering the DC side bus voltage limit and the inverter current limit, this paper focuses on the analysis the current distribution of induction motor in the field weakening region to achieve maximum torque output, and proposes a method which achieve the maximum torque output in full speed range based on the DQ axis voltage regulation. In the final, the simulation results are verified on the MATLAB/Simulink simulation platform.
Digitally controlled permanent-magnet synchronous motors (PMSMs) exhibit bandwidth limitations imposed by delay. In high power applications such as rail transit, the negative impact of delay is particularly serious due to the low switching frequency of the inverter. In this paper, the causes and effects of time delay are analyzed, and the sampling delay is greatly reduced by using multiple sampling method. Test results are given to verify the effectiveness and reliability of the proposed method.
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