No abstract

In order to improve the reliability of the traditional doubly salient electro-magnetic generators (DSEG) and realize the isolation of interphase magnetic circuit, a U-shaped rotor stator excitation generator (UR-SEG) for vehicle applications is proposed in this paper. The machine has the interphase physical isolation and short flux path structure because of the U-shaped rotors. According to the theoretical analysis of the fault-tolerant characteristics of this UR-SEG, the characteristic of the phase electromotive force (EMF) of the UR-SEG completely overlaps with the EMF of front and rear phase in the entire power generation stage is revealed. Then the flux linkage, EMF, output voltage of both normal and faulty states are comparative investigated using the two-dimensional finite element method (FEM). The output characteristics of the normal state and four faulty states of the machine with different exciting currents are researched, and the influence rules of fault on output characteristics are obtained. Finally, the outstanding fault-tolerant characteristics of the UR-SEG were verified by the experimental results.

This article describes a method to detect the position and speed in a rotary transformer pole AC synchronous motor. This method gives the pole position and velocity signal demodulation circuit and analyses the demodulation principle. After practical testing, this approach is reliable with high detection accuracy. Therefore, it is fully able to meet the needs of CNC machine tools with high performance in AC server system.