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To reduce energy consumption, we developed a technique that varies the number of magnetic poles in a permanent magnet (PM) motor. We propose a PM motor that can change the number of magnetic poles and produce two types of torque. When the motor operates with 8 poles, it produces a PM torque at low speeds. When the motor changes to 4 poles, it produces both PM torque and reluctance torque at high speeds...
In this paper, the performance improvement of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) is presented. By using SMC, 3D shaped core is easily constructed. The teeth of the stator core extended in order to enlarge the pole surface area in the same outer dimension of the motor. In this presentation, the motor performance of the motor using the core made by...
The paper presents results of a research on the sensorless drive with PMSM supplied through the sinusoidal filter. The back electromotive force based observer is used to the shaft position estimation. Used in the study, the observer's correction function, contains multi integrators in the path, which improves the position estimation. Otherwise than in a typical implementation of the position observer,...
This paper presents a sensorless and stable control method for a five-phase permanent magnet synchronous motor (PMSM). At first, a model of a five-phase PMSM is presented. After that a stability study has been performed by the analysis of the eigenvalues of the state transition matrix of the linearized PMSM model about an operating point. The results show that the machine speed response is unstable...
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