Electric rotor
Permanent magnet rotor, with smaller loss and e ciency increase
by 5-10%
Small volume and light weight
1-2 frame-size smaller compared with same-power asynchronous
motor
Low noise
Reasonable groove-pole matching, magnetic field design, wider
operating frequency, and lower operation noise
Large starting torque
The starting torque and overload capacity of permanent magnet
synchronous motor are one power level higher than that of
asynchronous motor.
No-shock starting
Smooth soft start, with starting current not more than 2 times of
the rated current
Large starting torque
The rotor does not need electrical excitation and can achieve high
torque at low speed