Innovative design for flux leakage reduction in IPM machines
- Resource Type
- Conference
- Authors
- Cirani, M.; Eriksson, S.; Thunberg, J.
- Source
- 2012 XXth International Conference on Electrical Machines Electrical Machines (ICEM), 2012 XXth International Conference on. :2671-2676 Sep, 2012
- Subject
- Power, Energy and Industry Applications
Components, Circuits, Devices and Systems
Fields, Waves and Electromagnetics
Rotors
Magnetic flux leakage
Magnetomechanical effects
Iron
Finite element methods
Stress
Torque
Automotive
buried magnets
finite element analysis
flux barriers
flux leakage reduction
IPM machine
magnet utilization
rib stress
- Language
This paper presents a novel rotor design for interior permanent magnet (IPM) machines. The advantage of this solution is the near elimination of the magnet flux leakage in the rotor iron bridges, which represents the main disadvantage of this machine topology. Therefore enhanced magnet utilization results from the new rotor arrangement. The concept is accomplished by utilizing non-magnetic wedges to lock the magnet in a robust rotor structure. The study is supported by both electromagnetic and mechanical finite element analyses. Significant results of this investigation are presented and discussed in the paper. A machine prototype with the implemented innovative rotor design was manufactured and tested for validation of the finite element simulations. Several manufacturing methods of the wedge have been investigated in order to evaluate the resultant wedge characteristics and assess the feasibility of mass production. The total cost analysis yields to potential machine cost reduction.