To perform the operation corresponding to changes of conditions properly with good response property by a simple control system concerning a rotary machine such as a blower and a pump.
An electromagnetic coupling C is provided between an electric motor M and the blower F, this electromagnetic coupling C rotates an inductor 31 having two magnetic substances 32, 33 by the motor M, and N-pole and S-pole of the magnetic substances 32, 33 formed by exciting an exciting coil 24 of a stator 21 move in the circumferential direction to rotate a cage rotor 25 provided on an output shaft 20. The number of revolutions of the cage rotor 25 is changed by controlling a current fed into the exciting coil 24 to control the number of revolutions of the blower F steplessly.
ARITA YUTAKA
ITONAGA YASUHIKO
| JPS57139286U | 1982-08-31 | |||
| JPS4996155A | 1974-09-11 | |||
| JPS5112601A | 1976-01-31 |