Patent ID: 9531316
Filing Date: 2016-12-27
CPC Classification: H02P

Claim Text:
1. A motor control device including a motor current detector for detecting current in windings to control an operation of a motor with a stator having the windings of three phases, the motor control device comprising: a digital controller for outputting a PWM switching signal based on an operation command from a host device, positional information from an encoder, and a detected motor current value that is a value of current in the windings; a power converter for applying drive voltage to the windings by turning on and off a switching element according to the PWM switching signal; the motor current detector for converting current flowing in the windings by the drive voltage to analog voltage; a ΔΣ AD converter for converting the analog voltage to a 1-bit digital signal; an AD conversion decimating filter for converting the 1-bit digital signal to a multi-bit digital signal, and outputting the multi-bit digital signal as the detected motor current value; a clock generator for generating a clock for operating the ΔΣ AD converter and the AD conversion decimating filter; and a stop signal generator for generating a clock stop signal that stops the clock of the clock generator for a predetermined period, wherein the stop signal generator generates the clock stop signal with a predetermined pulse width based on a timing of change of the PWM switching signal, and the clock generator uses the clock stop signal to stop the clock for a period of the predetermined pulse width.