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This paper proposes a novel nine-switch converter for the dual stator Doubly Salient Electro-magnet Motor (DSEM) in the compact driving system. The dual stator windings are connected to the dual output ports of the proposed converter, and both the operation principle and normal commutation method for the proposed system are analyzed. The interaction of the coupled outputs of the nine-switch converter...
Based on the finding that the inductance of doubly salient electromagnetic motor varies according to its rotor position, a new method to determine the initial rotor position is introduced in this paper. With no extra test pulses needed, this method detects the sector where the rotor is at by comparing the three-phase induced voltages during the excitation field building, significantly cutting down...
Low temperature cofired ceramic (LTCC) is an effective method to realize the miniaturization, high reliability and low cost for microwave and high-frequency devices. In the paper, a miniaturized 3 dB LTCC coupler using lumped elements is proposed based on the even-odd decomposition method for the built of image-reject mixer (IRM) in receiver systems. With a novel and compact structure, the coupler...
High frequency (HF) sinusoidal voltage injection is a common method to estimate the initial rotor position of permanent magnet synchronous machines (PMSM). When a HF sinusoidal voltage is injected into d-axis, the saturation of magnetic field in d-axis can lead to HF current response including harmonics. This paper makes a detailed analysis on the harmonic current response. Based on the analysis,...
This paper focuses on the suppression of the leakage flux and thrust ripple for slot-less tubular permanent magnet linear synchronous motor (TPMLSM). The winding factors of the unipolar and bipolar winding structures were analyzed firstly. And then the convex pole was used to reduce the leakage flux and improve the average thrust mainly for the bipolar winding structure. On this basis, the primary...
The doubly salient electro-magnetic motor (DSEM) is subject to significant torque ripple when working with traditional standard angle control method. To weaken the effects of the torque ripple for further applications of DSEM such as wind power generation and aerospace, in-depth analysis of the ripple generation mechanism and two novel strategies of inner torque loop and torque distribution control...
An integral dynamic model of a wind power generation system containing non-linear wind models, a fixed-pitch stall-regulated wind turbine model, a mechanical transmission model, a multi-pole low-speed doubly salient electro-magnetic generator model, and an electric control model are established in this paper with MATLAB/Simulink. The mathematical simulation tool of the novel doubly-salient electro-magnetic...
Nowadays, characteristics analysis of doubly salient electro-magnet machine is mostly about starter or generator separately, while transient characteristics of switching from starter to generator are less studied. Process of switching from starter to generator is an important part of the whole starter/generator system. In this paper, integral MATLAB model of doubly salient electro-magnet starter/generator...
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