Antonelli, Terry & Wands
Speed control apparatus and method for motors
 In speed control apparatus and method for a motor operable to drive a load whose magnitude varies over a predetermined period which use a unit for controlling voltage or current supplied to the motor such that the speed of the motor can coincide with a command speed, n pieces of data indicative of voltages or currents supplied to the motor and corresponding to n divisions of the predetermined period are independently stored in a read/write storage, at least one of the n pieces of data is corrected at the rate of each of the n divisions in accordance with a difference between the command speed and the speed of the motor, and the voltage or current supplied to the motor is controlled in accordance with at least the one of the n pieces of data, so that pulsation and noise occurring especially under low revolutions can be minimized. 
Hitachi Engineering Co., Ltd. Hitachi, Ltd.
H H
H02P H02P
inventional inventional
Tunehiro Fumio Nobuaki Kenichi
Endo Tajima Kato Iizuka