Improvement of efficiency and quietness with Externally Excited Synchronous Motor
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20239255
- Paper/Info type
- Other International Conferences
- Pages
- 1-6(Total 6 p)
- Date of publication
- Aug 2023
- Publisher
- JSAE & SAE
- Language
- English
- Event
- 2023 P, E&L
Detailed Information
| Category(E) | EV1 Advanced Battery Electric Vehicle Systems and Control |
|---|---|
| Author(E) | 1) Xu Fan, 2) Hiroki Wada |
| Affiliation(E) | 1) Nissan Motor Corporation, 2) Nissan Motor Corporation |
| Abstract(E) | A EESM (Externally Excited Synchronous Motor) consists of a rotor with winded copper wires. One of the benefits is to control the rotor electromagnetic with the rotor current, as the advantage comparing with the IPM (Internal Permanent Magnet) Motor. In order to practically use it and achieve the optimal NVH quietness performance, the air gap shape was re-designed to generate a sinusoidal curve magnetic flux density distribution. It is different from the common design that the air gap is same on the circumference between rotor and stator. Significant reduction of high-order magnetic flux density is realized, which does not contribute to torque. As well as the reduction of excitation force, and low iron loss. As the side effect of EESM, the high speed of rotation causes the large centrifugal force of the rotor wire. The strength reliability was guaranteed with the slot wedge shape and precision manufacturing. To guarantee the manufacturing speed for muti-poles wire winding, Synchronous control and high speed high precision high density layered winding is realized. Finally, different from IPM Motor only with magnets and less heat, the copper wires of EESM rotor will generate heat due to the current passing the wire. In order to keep the power density, it is important to assure the optimal cooling performance. A new cooling structure is developed to compensate for the increase in. A new cooling structure consists of an internal oil projection directly at the rotor hot-points and indirectly at the stator. |
