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In view of the existing problems of synchronous motor vector control system with mechanical sensor, sensor less motor control technology of synchronous motor is studied. A novel rotor position estimation method without mechanical sensor was suggested in this paper based on high-frequency signals injection into the rotor. With the structure of the synchronous motor itself as rotor position sensor,...
A novel rotor-side protection circuit is introduced in view of the problem of low voltage ride through in double-fed variable speed constant frequency wind power generation system. The motor's mathematical model of steady and transient states have been established, and meanwhile the dynamic response of the double-fed induction generator during the grid voltage drop and after the voltage recovery has...
Permanent magnet synchronous motor (PMSM) has several advantages such as simple structure, high efficiency and brushless etc, it has obtained widespread application. Rotor magnetic flux leakage of the traditional motor is large, so it will affect the performance of the PMSM. A new rotor structure is presented in this paper. Both the magnetic bridge and the permanent magnet are the arc-shaped structure...
Permanent magnet synchronous motor (PMSM) has several advantages such as simple structure, high efficiency and Brushless etc, it has obtained widespread application. There are high harmonic contents in the traditional PMSM air gap magnetic field. They will affect the performance of the PMSM. A new rotor structure is presented in this paper. The rotor slot interval changes according to the sine law...
The effect of vector control for Induction Motor (IM) largely depends on whether the motor parameters are accurate. However, the motor resistance parameters are varying as the temperature is changing. In the vector control system, the motor resistance parameters need to be online identified and the control model parameters should be online modified. Based on the relationship between the motor winding...
Though switched reluctance motor (SRM) has some excellent advantages, the acoustic noise, induced by the stator vibration, is one of the major drawbacks for the SRM. So how to reduce the vibration and acoustic noise in the SRM is the key problem at present .Several studies have showed that the main vibration and acoustic noise is saliently related to the configuration, geometry and stator pole shapes...
Having advanced in recent years, brushless doubly fed machine (BDFM) becomes a novel AC variable frequency control machine which has a broad vista of application in wind power generation system. Researchers focus on machine structure presently. Based on accurate analysis of electromagnetism relation, this paper firstly presents double-cage stator core structure in order to improve insulation of power...
At present, structure design and performance optimization are the key points in the study of brushless doubly-fed machine (BDFM). By using ANSYS software, the finite element method (FEM) models of BDFM were established. These models have different rotor structures that are reluctance rotor with magnetic barriers, cage rotor with nested shorted-circuit windings, reluctance rotor with salient poles,...
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