Speed control apparatus and method for motors
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United States of America Patent
Stats
-
Nov 7, 1989
Issued Date -
N/A
app pub date -
May 10, 1988
filing date -
Jan 28, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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