Abstract
This study demonstrates that the use of a flared-shape rotor structure in interior permanent magnet (IPM) permanent magnet synchronous motor (PMSM) yields better performance than the basic IPM PMSM motor, using a spoke structure with ferrite magnets. To concentrate the effective magnetic flux, the proposed rotor structure is composed of a number of ferrite magnets, which are inserted in a flared shape in the rotor core. This paper shows the comparison with the analysis results of 2D finite element method (FEM), and it is shown that the proposed IPM PMSM motor can be an effective substitute for the basic IPM PMSM motor, which requires low torque ripple and high efficiency. In particular, the proposed flared IPM PMSM motor has lower pulsation of torque and superior efficiency, as well as lower acoustic noise and vibration, compared to the basic IPM PMSM motor. To verify the performance improvement of the proposed model, a prototype of the proposed model was manufactured. It was experimentally confirmed that the proposed model has lower torque ripple and higher efficiency than the basic model. Based on this performance improvement, the proposed flared IPM PMSM motor is suitable for electric vehicles and home appliances.
Highlights
The permanent magnet synchronous motor (PMSM) is widely used in the electric vehicle and domestic appliance industries
An electric water pump system consists of three parts: cooling water that lowers the temperature of the engine room, interior permanent magnet (IPM) motor that is responsible for the rotation of cooling water, and the controller
We proposed the flared type ferrite IPM model as an alternative to the basic spoke type ferrite IPM model
Summary
The permanent magnet synchronous motor (PMSM) is widely used in the electric vehicle and domestic appliance industries. In References [13,14], a new structure was proposed for the concentrated flux type synchronous motor (CFSM) to improve torque density and vibration characteristics. In Reference [21], a type of transverse flux reluctance machine was studied This design had the drawback of having a high fundamental frequency and high torque ripple, which complicate the control of the motor. Two types of concentrated flux type IPM motors with the flared-shape magnets arrangement were examined. The proposed flared-shape structure can increase the useful magnetic flux, so the flared type IPM motor is a form of the concentrated flux type IPM motor. The study proposes a flared type rotor structure for replacing the basic spoke type IPM model, for performance enhancement. The improved performance and replacement suitability of the proposed model were experimentally verified
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