Rotor structure suppressing suspension force ripple in an IPM type bearingless motor with 2-pole motor windings and 4-pole suspension windings

A bearingless motor has integrated characteristics of an electrical motor and a magnetic bearing. In general, surface permanent magnet (SPM) type rotor structure with a ring magnet magnetized in parallel is employed in high-speed PM type bearingless motors. However, in case of increasing motor size...

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Bibliographic Details
Main Authors: Matsuzaki, T., Takemoto, M., Ogasawara, S., Ota, S., Oi, K., Matsuhashi, D.
Format: Conference Proceeding
Language:English
Subjects:
Bearingless motors
Force
highspeed machines
magnetic bearings
Magnetic flux density
magnetic levitation
magnetic suspension
Permanent magnet motors
Permanent magnets
Rotors
suspension force ripple
Suspensions
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Summary:A bearingless motor has integrated characteristics of an electrical motor and a magnetic bearing. In general, surface permanent magnet (SPM) type rotor structure with a ring magnet magnetized in parallel is employed in high-speed PM type bearingless motors. However, in case of increasing motor size for high output, this rotor structure has problems of insufficient suspension force due to a wide air gap and high cost by using the large-diameter ring magnet magnetized in parallel. Therefore, this paper discusses a novel interior permanent magnet (IPM) type rotor structure for the high-speed and high-output bearingless motor. In the novel IPM type rotor structure, suspension force ripple is suppressed by means of arranging flux barriers at the suitable position in a rotor. It is confirmed with 2D-FEM that the proposed rotor structure using the flux barriers is effective in suppressing the suspension force ripple.
DOI:10.1109/ICElMach.2012.6349957