Experimental Verification With Loads of Line-Start Type Self-Excited Wound-Field Motor With Three-Phase Concentrated Winding Stators

Abstract

This paper describes a novel line-start type selfexcited wound-field synchronous motor with three-phase concentrated winding stator. The unique feature of this proposed motor is that it accelerates by obtaining the starting torque from the slip frequency at the time of starting, and at the time of synchronous pull-in, it is driven synchronously with utilizing the second order space harmonic as the field magnetization power. This driving principle was verified by performing a load test using the prototype with two types of load, fan load and eddy current brake load. Consequently, the synchronization based on the proposed drive principle could be demonstrated on the actual machine, and the line-start characteristics of the proposed motor have been clarified.

Verification of effect of secondary conductor bar on starting characteristics in line‐start type self‐excited wound‐field synchronous motor

“…It is very important to understand the effects of the secondary conductor bar on the starting characteristics for the optimum design of the proposed motor. The authors have already verified in [22] that the proposed motor can self‐start based on the principle. In this paper, it is clarified experimentally how the starting characteristics are affected by changing the combination of the secondary conductor bar connections with respect to the design of the original model.…”

“…To drawback these background problems, the authors are researching a third new type of line-start type motor [22]. This technique is classified as a brushless wound-field synchronous motor that obtains the rotor magnetomotive force from the armature side by the self-excitation.…”

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

“…After the initial acceleration, a rotor field is formed by the second spatial harmonic and rotates at a synchronous speed. Experimental verification was presented in [26]. However, the requirement of the secondary conductor bars and two types of coils on the same rotor core is the main drawback of this approach.…”