Hiromitsu Itabashi

Development of an Axial Gap Motor With Amorphous Metal Cores

This paper presents a novel motor design concept that utilizes amorphous cut cores in the stator and ferrite magnets in the rotor to obtain a high-efficiency motor. This motor employs a six-pole nine-slot axial gap construction and aims to provide 90% efficiency with decreased size and low cogging torque for fan motor applications. Amorphous cut cores are applied to the stator to decrease iron loss and save motor space. Skewed magnets are employed to decrease cogging torque. Three-dimensional finite element analysis was used to analyze motor performance. In order to verify the accuracy of the design, a trial motor was constructed, and a large range of experiments was conducted to measure the motor characteristics. The results of the trial motor meet the design goals.

Development of a high speed motor using amorphous metal cores

This paper presents the development of a 10kr/min motor that utilizes the amorphous toroidal core. This motor employs a non-slotted axial gap structure with two ferrite magnet rotors and one amorphous toroidal stator. The goal of the motor is to produce a 400W output, at 90% high efficiency with a size of Φ100×L30. The low core loss design is employed to decrease the large core losses produced by a high frequency field. The motor design equations and three dimensional finite element analysis (3D FEA calculations) are presented. A prototype machine was manufactured. The structure of the prototype and the test results are presented in this paper.

Development of an axial gap motor with amorphous metal cores

This paper presents a noble motor design concept that utilizes amorphous cut cores in the stator to obtain a high efficiency motor. This motor employs 6-pole, 9-slot axial gap construction and aims to provide high efficiency with small size and low cogging torque for fan motor applications. Amorphous cut cores are applied to the stator to decrease iron loss and save motor space. The magnets with distinct shapes are employed to decrease cogging torque. 3D finite element analysis was used to model and analyze motor performance. In order to verify the design concept, a trial motor was constructed and a large range experiments were conducted to measure motor characteristics.

Iron Loss Reduction in Permanent Magnet Synchronous Motor by Using Stator Core Made of Nanocrystalline Magnetic Material

This paper presents the results of experimental trials carried out on a permanent magnet synchronous motor (PMSM) that uses a stator core made of a nanocrystalline magnetic material (FINEMET). It is demonstrated that the manufactured stator can reduce the PMSM total iron loss by 64% to 75% compared with an equivalent motor using a stator made of conventional non-oriented silicon steel. The experimental results are confirmed by 2-D finite-element analysis.