| Title |
Permanent Magnet Shape Optimization of Driving Motor for In-wheel Considering Eddy Current Loss |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2019.33.9.042 |
| Keywords |
Demagnetization; Eddy Current Loss; In-Wheel; IPMSM HEV; Reluctance Torque |
| Abstract |
Recently, development of environmentally friendly vehicles is accelerating, and development of a new type of high efficiency / high performance vehicle system is required. In-wheel system has a configuration of installing electric motor directly to the wheel which has an advantage of increasing efficiency by removing power train element. The electric motor designed in this research has a short coil-end length by adopting concentrated winding. Concentrated winding is generally considered to be vulnerable to heat demagnetization caused by permanent magnet eddy current loss. Normally, design of increasing the magnet thickness was adopted to resolve this problem. However, this approach resulted in increase manufacturing cost. This paper performed an eddy current loss analysis of permanent magnets and proposed a design prototype having superior demagnetization characteristics and minimizing permanent magnet usage. The design increased reluctance torque and showed high power/efficiency performance. The design results were validated by functional and performance test. |