Abstract
In this paper, the three-phase inverter power efficiency of a brushless DC (BLDC) motor drive is analyzed theoretically and verified experimentally. An inverted pulsewidth modulation driving scheme has higher power efficiency than a conventional six-step driving scheme, particularly under low rotor speed due to less diode conduction power loss of Sync metal-oxide-semiconductor field-effect transistors (MOSFETs). However, the difference in the power efficiency decreases as the rotor speed increases; for a rotor speed above 1000 r/min, the difference in the power efficiency is negligible. In addition, the power efficiency of the inverted driving scheme drops further than one for the conventional six-step driving scheme with sampling frequency increase. It is due to the additional switching power loss of Sync MOSFET. The theoretical analysis of power loss in a three-phase inverter verifies the experimental results.
| Original language | English |
|---|---|
| Article number | 8680796 |
| Pages (from-to) | 34-40 |
| Number of pages | 7 |
| Journal | Canadian Journal of Electrical and Computer Engineering |
| Volume | 42 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Dec 2019 |
Keywords
- Brushless dc (BLDC)
- inverted pulsewidth modulation (PWM)
- power efficiency
- power loss
- three-phase inverter
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