Proposal of Novel Line-Start Type Self-Excited Wound-Field Synchronous Motor With Three-Phase Concentrated Winding Stator

Abstract

This paper describes a novel line-start type self-excited wound-field synchronous motor with three-phase concentrated winding stator. The unique feature of this proposed motor is that it accelerates by obtaining the induction torque from the slip frequency at the time of starting, and at the time of synchronous pull-in, it is driven synchronously with the second order space harmonic as the field magnetization power. First, the operation principle and the magnetic circuit design topologies will be described. Then, the prototype for principle verification and experimental setup will be revealed. Next, the result of evaluating the no-load synchronization pull-in characteristics in actual machine evaluation is reported.

Brushless Self-Excited Synchronous Field-Winding Machine With Five- and Higher-Phase Design Using Independently Controlled Spatial Harmonics

“…al. [25] presented a line-start type self-excited machine approach utilizing secondary conductor bars on the rotor in addition to induction coils and field coils. Hence, the rotor with a salient pole structure is wound with the two rotor coils, and an auxiliary pole is placed between salient poles on the outer diameter side of the rotor where the secondary conductor bars are arranged to create a magnetic circuit.…”

Three-Dimensional Finite-Element Analysis and Optimal Design of Hybrid-Excitation DC Brush Motor for Automotive Engine Start Applications

“…Figure 4 shows the distribution of the magnetic field lines for the traditional dovetail groove design. Second, because of the design used for magnet fixation, there may be wear and tear of the magnet material during processing; correspondingly, owing to the poor structural stresses at the sharp corners of the magnet, the magnet may break or result in other problems if the assembly is not performed carefully [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. This work proposes an improved design scheme for the traditional dovetail groove and verification of its feasibility through FEA and simulation.…”