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Variable inductors have a simple structure that consists of only magnetic core, primary dc and secondary ac windings, but can control effective inductance of the secondary ac winding by the primary dc current due to magnetic saturation effect. Therefore, the variable inductors can be applied as a reactive power compensator in electric power systems by combining with power capacitors [1].
This paper presents an outer-rotor type permanent magnet reluctance generator (PMRG) for a small-scale wind-turbine and micro-hydroelectric power generation. First, this paper describes a PMRG using ferrite magnets. Residual magnetic flux density of the ferrite magnet is about three times lower than the rare-earth magnet, but the cost is about 10 times lower. It is demonstrated that the proposed PMRG...
A permanent magnet reluctance generator (PMRG) has a doubly salient pole structure. The permanent magnets are embedded in the stator yoke, and concentrated windings are arranged individually around each stator pole. On the other hand, the rotor has neither permanent magnets nor windings. Therefore, the PMRG has a simple and robust structure, and permits a multipolar structure. Its application to small-scale...
Variable inductors, which consist of only a magnetic core and primary dc and secondary ac windings, can control effective inductance of the secondary ac winding by primary dc excitation. Therefore, the variable inductors can be applied as a var compensator in electric power systems. In a previous paper, we have proposed a novel three-phase-laminated-core variable inductor. It has only one laminated...
This report presents the metal powder compaction using ultrasonic vibration for the fabrication of a three-dimensionally-shaped magnetic core. First, we describe a design of ultrasonic compaction tools using FEM. Side wall of the sample was ultrasonically excited by a radial vibration of the die, while the upper and lower punches are driven by longitudinal vibrations. Second, we present the results...
This paper presents a method for dynamic simulation of a permanent magnet (PM) motor including its drive circuit based on reluctance network analysis (RNA). The RNA, which is based on the magnetic circuit method, has some advantages for simulating electric motors as follow: simple analytical model, high calculation accuracy, and easy to combine with external electric circuits, motion and thermal dynamics...
This paper reports efficiency improvement of a doubly salient-pole homopolar machine with powder iron core. Powder iron core is composed of the metal magnetization powder with resin. It has advantages of low cost, isotropic magnetic property for three dimensions, a high flexibility of design, and low eddy-current loss at high frequency. This paper shows characteristics and performance comparisons...
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