Tachometer for determining the speed of a motor

Details Tachometer for determining the speed of a motor Tachometer for determining the speed of a motor

1992-02-28

1994-11-29

Ro, Bentsu

Electricity: motive power systems

Automatic and/or with time-delay means

Speed or rate-of-movement

318464, G01P 348

Patent

active

053693442

ABSTRACT:
A motor control system accurately and reliably controls the speed of a motor so that the motor operates in accordance with a predetermined motor speed profile, and therefore does not exceed a predetermined safe speed, decelerates at a controlled rate, maintains a safe minimum speed, and does not turn in reverse. If the motor operates out of these limits, a malfunction is indicated and the control system halts operation of the motor. The motor speed is determined using an electronic tachometer that analyzes the current in at least two phases of the motor to provide extremely precise and reliable velocity information for the motor.

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