Since the revolving speed can be synchronized with the frequency irrespective of load variations, high accuracy speed control is easily possible without feedback control.

The series 100 for PM MOTORs has the stoutness equivalent to that of cage-rotor type induction motors.
In addition, more compactness and higher speed have been attained. Thus the motor mass per unit output kW has been reduced to 2/3 to 1/2 that of conventional series, even smaller than cagerotor type induction motors.For this series, the ranges of capacities and revolutions have been extended so that a variety of needs can be met.

• 4L(4-pole,Low speed)series
• 4M(4-pole, Medium speed) series.
• 4H(4-pole,High speed) series