Patent ID: 6242875
Filing Date: 2001-06-05
Classification: H02P

Abstract:
A motor driving apparatus for driving a motor by sequentially switching among a plurality of current-supply patterns in accordance with electrical angle of a rotor, comprising:an output circuit having a plurality of switch element individually interposed between a plurality of terminals of said motor, and first and second power-supply lines;a detection control circuit for controlling said plurality of switch elements to sequentially switch among said plurality of current-supply patterns while said rotor is resting;a current detecting circuit for detecting current flowing through said plurality of terminals;a position detecting circuit for detecting stop position of said rotor on the basis of rate of change in said current for each of said plurality of current-supply patterns; anda starting control circuit for selecting one of said plurality of current-supply patterns as a current-supply pattern for starting on the basis of said stop position and controlling said plurality of switch elements to realize said selected current-supply pattern.