Abstract
To analyze brushless DC motor (BLDCM) rotor temperature rise caused by armature currents, the classification estimation method of an eddy-losses electromotive force (EMF) was proposed. The armature current is divided into two parts: DC component iDC and AC component. In terms of space moving rotor cuts the magnetic field caused by iDC, and motion EMF em is produced. In terms of time variation of iAC can induce induced EMF et in the rotor. Without considering eddy reaction, motion EMF em and induced EMF et of an 11 kW BLDCM was calculated and analyzed by selecting maximum closed curve and maximum curved surface at the typical operating point. It can be got that the motional EMF em is lower than induced EMF et (cogging EMF is not considered). Provided the armature current is continuous, rotor temperature rise will not particularly wave when the load is changed. This reason is attributable to that the load change only effects DC component iDC. Good agreement is got between the idea and the experiment data.
| Original language | English |
|---|---|
| Pages (from-to) | 133-140 |
| Number of pages | 8 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 33 |
| Issue number | 15 |
| State | Published - 25 May 2013 |
Keywords
- AC component
- Brushless DC motor (BLDCM)
- DC component
- Induced electromotive force (induced EMF)
- Motional electromotive force (motional EMF)
- Rotor temperature rise