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Described the operating principles of permanent magnet synchronous motor used in electric vehicles. Introduced weakening principle due to its mathematical models. Traditional control after decoupling often used PI controller, often influence of motor parameters, affecting the robustness of control system, especially operated at above the rated speed on flux weakening condition. Analyzed the proportional...
In order to obtain the accurate information of generator speed and angle, and alleviate the shortcomings of the speed sensor, this paper presents a sensorless vector control model of permanent magnet synchronous generator (PMSG) based on sliding mode observer (SMO) in the direct-drive permanent magnet wind power generation system. The proposed observer is easy to implement and less sensitive to parameter...
A bearingless permanent magnetic synchronous motor (BPMSM) has combined the characteristics of a permanent magnetic synchronous motor and magnetic bearings. The rotor suspension force is closely related to the air gap magnetic field of the torque windings. So accurately getting the magnitude and phase of the air-gap magnetic field on the torque windings is the key to precisely control the levitation...
The permanent magnet synchronous motors are widely used in various industrial applications due to many advantages such as high power density, high efficiency, low manufacturing cost and so on, but cogging torque and moment of inertia are the most important factors affecting the performance and control precision. In this paper, firstly, the cogging torque can be effectively reduced by taking the auxiliary...
This paper presents a leading angle flux-weakening control method for the wide-speed operation of permanent magnet synchronous motor (PMSM). The angle offset of flux-weakening is gained by integraling the error of given index and calculation index, which is the utilization of motor's terminal voltage to the voltage of DC bus, and then a voltage loop is established to maintain the stability of flux-weakening...
Described the surface-mount permaent magnet synchronous motor used in electric vehicles operation principle, introduce the current limit trajectory and the voltage limit trajectory based on its mathematical model, Flux-weakening control extends the speed range of the machine effectively. Conventional flux-weakening speed control above the rate speed, the q-axis current and d-axis current coupling...
A MRAS (Model Reference Adaptive System) method for evaluation of induction motor speed to achieve speed sensorless vector controlling by the variation of transient reactive power is discussed in terms of traditional methods. A mathematic model is derived, and the reliability of the speed estimator is performed in speed-torque domain using small signal analysis. The simulating model of speed-sensorless...
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