Performance Comparison

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