Proceedings ArticleDOI
Characteristics of a permanent magnet type bearingless motor
M. Oshima,Satoru Miyazawa,Tazumi Deido,Akira Chiba,Fukuzo Nakamura,T. Fukao +5 more
- Vol. 1, Iss: 2, pp 196-202
TLDR
In this article, a bearingless motor with the principles of permanent magnet type synchronous motors is proposed, in which additional 2-pole windings are wound together with 4-pole motor windings in stator slots.Abstract:
Super high-speed and high-power electric machines are required for turbomolecular pumps and spindle drives. High rotational speed and high power drives can be achieved with bearingless motors. In this paper, a bearingless motor with the principles of permanent magnet type synchronous motors is proposed. High power factor and high efficiency can be expected in permanent magnet type bearingless motors. The proposed bearingless motor is a 4 pole permanent magnet synchronous motor, in which additional 2-pole windings are wound together with 4-pole motor windings in stator slots. With currents of 2-pole windings, radial magnetic forces are produced to support a rotor shaft. Principles of radial force production of surface-mounted permanent magnet bearingless motors are analyzed mathematically. It was found that radial forces are efficiently produced by employing thin permanent magnets on the surface of rotor iron core. A test machine was built in order to measure inductance functions as well as relationships between voltages and currents.read more
Citations
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Journal ArticleDOI
Overview of Bearingless Permanent-Magnet Synchronous Motors
TL;DR: A comprehensive overview of BPMSMs is presented, with particular emphasis on mathematical models, motor topologies, and control strategies, and several possible development trends of the BPMSM are discussed.
Journal ArticleDOI
Design and analysis of permanent magnet-type bearingless motors
TL;DR: The ratio of radial force over current as well as the peak air-gap flux density are discussed and the optimal permanent magnet thickness is determined.
Journal ArticleDOI
Levitation and torque control of internal permanent magnet type bearingless motor
TL;DR: An internal permanent magnet (IPM) type bearingless motor is introduced which has the merits of strong levitation force and relatively easy control properties and a simple experimental apparatus is made to confirm the properties.
Journal ArticleDOI
Bridge configured winding for polyphase self-bearing machines
TL;DR: A winding based on a bridge connection for polyphase self-bearing rotating electrical machines with advantages such as: 1) requiring only one power supply for torque production; 2) lateral forces are produced using auxiliary power supplies of relatively low current and voltage ratings; and 3) relatively low power loss.
Journal ArticleDOI
Modeling and Control of Salient-Pole Permanent Magnet Axial-Gap Self-Bearing Motor
Quang Dich Nguyen,Satoshi Ueno +1 more
TL;DR: In this article, an inset-type axial-gap self-bearing motor (AGBM) is introduced, which is an electrical combination of an axial thrust-bearing and axial flux motor, and a method for controlling the axial position and the rotating speed of the AGBM without the influence of reluctance torque is discussed.
References
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Proceedings ArticleDOI
A super high speed PM motor drive system by a quasi-current source inverter
TL;DR: In this article, a surface-mounted permanent magnet motor with the ratings of 5 kW and 180000 RPM for super-high-speed drive applications such as machine tools is described, where a much larger air gap is used to reduce the slot ripples and hence the resultant eddy current loss in the metallic sleeve that retains the permanent magnets.
The bearingless electrical machine
TL;DR: In this article, a bearingless electrical machine with a radial bearing and a special winding was constructed for the levitating forces in a special way so that commercially available standard ac inverters for drives can be used.
Proceedings ArticleDOI
No load characteristics of a bearingless induction motor
TL;DR: In this article, a bearingless induction motor with additional two-pole stator windings was used to produce radial forces on the rotor shaft, where the twopole windings were regulated by radial position control loops to maintain the rotor position near the stator center.