Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 70, Issue 1, Pages 243-254Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2022.3146537
Keywords
Force; Vibrations; Air gaps; Magnetic flux; Torque; Magnetic fields; Stators; Asymmetric magnetic field; consequent pole (CP); permanent magnet (PM) machine; unbalanced radial force; vibration reduction design
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This article focuses on electromagnetic vibration and its reduction design in the consequent pole permanent magnet (CPM) machines. Two new designs are proposed to reduce the vibration caused by unbalanced radial force, and the prototypes are manufactured and tested to validate the theoretical analysis and proposed vibration reduction design.
The consequent pole permanent magnet (CPM) machine is well known for its high magnet utilization ratio and poor vibration performance. This article focuses on electromagnetic vibration and its reduction design in CPM machines, and the conventional surface-mounted permanent magnet (SPM) machine is used as a benchmark. First, the asymmetrical magnetic field and unbalanced radial force of the CPM machine are investigated with emphasis. The slot-pole combination and force modulation effect are the two reasons for the unbalanced radial force generation. Afterward, two new designs to reduce the vibration caused by the unbalanced radial force are proposed, and the reduction principles are described in detail. Finally, the prototypes of the 12-slot/10-pole SPM and proposed CPM machines are manufactured. The tests are conducted to validate the theoretical analysis and proposed vibration reduction design.
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