Abstract
The phases current and torque will change all the time because of commutation in brushless DC motor. Dynamic torque is analyzed using two devices conducted drive mode. Average torque is calculated to obtain the speed-torque characteristics of BLDCM. It's is a non-linear curve, and the output speed is less than the ideal speed. So the equivalent voltage coefficient is less than one. Using overlapping commutation method can improve the output speed of motor, and it can reach the ideal speed in theory. Then the equivalent voltage coefficient equals one. Compound drive method with two devices and three devices conducted in turns can make the output speed of motor higher than the ideal value, then the equivalent voltage coefficient is larger than one. Simulation results show compound drive method can enlarge the speed change region, and improve the output power.
| Original language | English |
|---|---|
| Pages (from-to) | 1050-1056 |
| Number of pages | 7 |
| Journal | Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University |
| Volume | 34 |
| Issue number | 6 |
| State | Published - 1 Dec 2016 |
Keywords
- Brushless DC motor
- Compound drive
- Dynamic torque
- Equivalent voltage coefficient
- Mechanical characteristics
- Overlapping commutation