Patent ID: 9748879
Date: 2017-08-29
CPC Classifications: H02P

Claim:
1. A motor drive controller comprising: a motor drive circuit that drives a selected motor and having a position detector that detects a position of a rotor of the selected motor and outputs a position detection signal; a motor control circuit that generates a rotation pulse signal based on the position detection signal output by the motor drive circuit; and a microcomputer that is provided with at least one timer and is configured to: wherein the external system controls an operation of the selected motor in place of the expected motor by using the conversion signal, wherein the microcomputer measures an edge interval of the rotation pulse signal using the timer and determines a time to toggle the conversion signal, wherein the microcomputer obtains a value by dividing the nearest edge interval measured by the timer by n, sets the timer to the value, and toggles the conversion signal when the timer times out, and wherein when the conversion signal is toggled (n−1) times, the microcomputer measures a period to a next edge of the rotation pulse signal using the timer to measure the nearest edge interval.