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The traction converter consists of a single-phase AC-DC rectifier and a three-phase DC-AC inverter. Due to special structural characteristics of single phase rectifier, a fluctuating voltage component with the frequency twice of the grid's, exists in DC-link voltage. Fed by fluctuating DC-link voltage, a beat phenomenon occurs in traction motor, and harmonic components appear in both stator current...
In sensorless induction motor drives, the stator model is always used to estimate the stator flux because it does not require a speed signal. Combined with the stator model, stator field orientation control strategies are preferred in implementation. In these strategies, direct torque and flux control based on space-vector modulation (SVM-DTC) is the one with good performance. It produces fast torque...
The influence of cross coupling effect on the performance of the indirect rotor field oriented control (IFOC) for high power AC traction drives cannot be neglected due to the wide operation range, low switching frequency and so on. In this paper, the cross coupling problem between d and q axis current component in the IFOC scheme is discussed. An improved current regulation scheme is proposed based...
Compared to rotation induction motors (RIM), short stator single side linear induction motors (SLIM) traction system is a new traction mode which is adhesion independent. SLIM is applied in the propulsion of transit rail systems widely in recent years. The SLIM is capable of adhesion independent braking and acceleration which ensures the vehicle safe and reliable operating. This paper presents a novel...
This paper presents a decoupling method for speed-sensorless vector control of induction motor to track the flux command fast and eliminate torque ripples in flux-varying environment, such as field-weakening operation and efficiency optimization. Rotor flux-oriented control can decouple the speed and flux control. However, the decoupling is on the condition of a constant rotor flux. When motor drives...
Long stator linear synchronous motors (LSLSM) are being used widely in many areas, for its high dynamic response, robustness and accuracy. But because linear structure increases the cost and complication of position sensor, speed sensorless control methods become more important for linear motor than rotary motor. The paper presents a modified estimation method to get velocity and position of mover...
This paper presents the principle of long stator linear synchronous motor (LSLSM) and introduces the mathematic modeling of LSLSM. A comparative study of three kinds of field oriented control (FOC) methods including the stator field oriented control (SFOC), airgap field oriented control (AFOC) and rotor field oriented control (RFOC) is given in detail. Comparison results show that for the demands...
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