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.
Highlights
As an industrial general-purpose motor that uses a fan or a pump as a load, a line-start type induction machine (IM) from a commercial AC power source has been widely used because of the demand for system cost reduction
High efficiency can be achieved by adopting a permanent magnet type synchronous motor (PMSM) that does not require an exciting current for IM
This paper proposes a line-start type self-excited wound-field synchronous motor (LS-SEWFM) based on a new operation principle, explains the magnetic circuit topology, and reports the evaluation results of the no-load synchronous pull-in characteristics with prototype
Summary
As an industrial general-purpose motor that uses a fan or a pump as a load, a line-start type induction machine (IM) from a commercial AC power source has been widely used because of the demand for system cost reduction. High efficiency can be achieved by adopting a permanent magnet type synchronous motor (PMSM) that does not require an exciting current for IM. As another research with a different magnetic circuit topology, the first one is a brushless wound-field type threephase synchronous motor that self-starts by using the Gerges. This paper proposes a line-start type self-excited wound-field synchronous motor (LS-SEWFM) based on a new operation principle, explains the magnetic circuit topology, and reports the evaluation results of the no-load synchronous pull-in characteristics with prototype. With this configuration, at the time of starting, an induced current having a slip frequency flows through the secondary conductor bar to generate an induction torque and accelerate.
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