| 摘要 |
<P>PROBLEM TO BE SOLVED: To shorten the starting time of a brushless motor and reduce a loss in current application energy by setting a magnet rotor quickly in its initial position by initial setting regardless of differences among temperature states of each phase coil and fuel viscosity. <P>SOLUTION: A driver for a brushless motor 11 used for a fuel pump rotates a magnet rotor 15 by switching the current application to each phase coil 14A-14C in order and performs an induced drive for controlling the current application to each phase coil 14A-14C based on an induced voltage generated in each phase coil 14A-14C. A driver includes a shunt resistor 16 which measures a motor current flowing in each phase coil 14A-14C and a control circuit 12. The control circuit 12 performs initial setting for controlling the current application to each phase coil 14A-14C so as to set the magnet rotor 15 into its initial position before performing the induced drive, and controls a current application duty value based on a motor current measured therefor. <P>COPYRIGHT: (C)2011,JPO&INPIT |
