Comparison options
| Asynchronous Motor
| Brushless DC motor
| Synchronous Permanent Magnet Motor |
Motor Performance | Rotational speed
| The larger the load, the greater the deviation | Significant difference between no-load speed and loaded speed | Constand speed |
Efficiency | Lower, and beyond the rated load, the efficiency is even lower | Higher | Highest, and the efficiency is the same high in difference load |
Power factor | Lower, and beyond the rated load, the power factor is even lower | Higher | Highest |
Starting capability | Hard start, can be initiated directly without a drive | Soft start, ‘with a high starting torque | Soft start, with a high starting torque |
Vibration noise | High vibration, accompanied by loud noise | High vibration, accompanied by loud noise | Low vibration, accompanied by low noise |
Volume | Large | Small | Small |
Controller Performance | Control complexity | Low | High | High |
Dynamic responsiveness | Slow | Fast | Fast |
Speed stability | Average | Average | High |
Speed regulation range | Narrow | Wider | Very wide, can exceed 1.5times the rated speed |
Torque fluctuation | Large | Average | Small |
Control accuracy | Low | Average | High |
Cost Comparison | Processing complexity | Simple | High | Average |
Motor cost | low | High | High |
Controller cost | low | High | High |