Torque Analysis of Interior Permanent-Magnet Synchronous Motors by Considering Cross-Magnetization: Variation in Torque Components With Permanent-Magnet Configurations

The variation in torque of interior permanent-magnet synchronous motors with driving conditions and magnet configurations is investigated by considering the cross-magnetization caused by magnetic saturation. The torque is decomposed into four components, i.e., the main magnet torque, main reluctance...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2014-07, Vol.61 (7), p.3192-3201
Main Authors: Yamazaki, Katsumi, Kumagai, Masaki
Format: Article
Language:English
Subjects:
Centrifugal force
Driving conditions
Finite-element methods (FEMs)
High speed
Magnetic cores
magnetic field
Magnetic flux
Magnetic saturation
Magnetization
Magnetomechanical effects
Mathematical analysis
permanent-magnet motors
Permeability
Saturation (magnetic)
Saturation magnetization
stress
Synchronous motors
Torque
variable-speed drives
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Summary:The variation in torque of interior permanent-magnet synchronous motors with driving conditions and magnet configurations is investigated by considering the cross-magnetization caused by magnetic saturation. The torque is decomposed into four components, i.e., the main magnet torque, main reluctance torque, cross-magnet torque, and cross-reluctance torque. It is revealed that the cross-magnet torque is always negative and this component reduces the total torque of the motor. This effect becomes large in the case of the V-type magnet configuration. The magnet configuration, which reduces the cross-magnetization effect, is also investigated by considering the mechanical strength against the centrifugal force caused by high-speed rotation. The validity of the calculation is confirmed by experiments.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2013.2278508