Patent ID: 8305022
Filing Date: 2012-11-06
Classification: H02P

Abstract:
1. A motor control device, comprising: first to third amplifiers which amplify voltage generated at first to third shunt resistances connected to first to third drivers to supply driving current of each of three phases to a three-phase brushless motor; first to third sample-hold circuits which sample and hold voltage amplified by the first to third amplifiers; a multiplexer which sequentially selects and outputs voltage values held by the first to third sample-hold circuits; an A/D converter which performs A/D conversion on output signals of the multiplexer; and an arithmetic unit which calculates the driving current through an output signal of the A/D converter, estimates a magnetic pole position of the motor based on the driving current, and performs pulse width modulation, PWM, control on the driving current by controlling the first to third drivers.