Xianming Deng

Rotor Position Detection of Synchronous Motor Based on High-frequency Signal Injection into the Rotor

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, mathematical model for rotor position observer is established according to the principle of rotary transformer. The sensor less vector control model of synchronous motor is established based on the rotor high frequency signal injection. Simulation and experiment results show the reliability and a high level precision of the method

A Novel Parameter Identification Method for Induction Motor

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 resistance and the temperature, this paper presents a method to calculate the dynamic winding resistance by online detecting the winding temperature. The experiment results show that not only is this method correct, it also has great identification accuracy. This identification method has a wide application prospect, for it is simple, less calculation and easy realization.

Design and Finite Element Analysis of Permanent Magnet Synchronous Motor with Novel Magnetic Bridge

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. We did finite element analysis to the new PMSM and traditional PMSM by the software ANSYS. We get the magnetic field distribution & torque-angle characteristic of the two kinds of PMSM. The results show that the rotor magnetic flux leakage of the PMSM with new magnetic bridge is smaller than the traditional PMSM, and the new PMSM also has longer magnets which can supply a larger main flux. Therefore, the performance of the new PMSM has been greatly improved.

Design and finite element analysis of a novel structure brushless synchronous machine

In order to solve problems of complicated structure and huge volume of synchronous machine (SM), this paper presents a brushless synchronous machine with the structure of single stator core and single rotor core. Power windings and excitation windings of stator are laid in the same stator cor e. Correspondingly, DC excitation windings and AC windings of rotor are laid in the same rotor core, fixed in the machines ro tor by the rotating rectifier which is formed of commutation diodes. Magnetic field of the new structure machine is analyz ed and calculated by ANSYS. The results show that the designed brushless synchronous machine has characteristics such as simple structure and superior performance. Therefore, it has a good application prospect.

Design and Finite Element Analysis of Permanent Magnet Synchronous Motor with Novel Rotor Type

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. We did finite element analysis to the PMSM with new rotor and traditional PMSM by the software ANSYS. The results show that the fundamental content in the air gap magnetic field of the new rotor is high while the High-order harmonic contents is small, the utilization rate of the magnets in the new rotor structure PMSM is high, the new PMSM has a strong overload capacity. So the performance of the new structure PMSM is improved greatly.