DRIVE CONTROL DEVICE AND FUEL PUMP DRIVE SYSTEM

摘要

A microcomputer of a drive control device for controlling the driving of a brushless motor has a positioning part and a torque acceleration control unit. The positioning unit controls the power to be supplied to the windings, to thereby position the rotor at a drive start position which is a position of the rotor relative to the stator at which the drive control of the brushless motor can start, before starting the drive control of the brushless motor. The torque acceleration control unit controls the power to be supplied to the windings so that a torque acceleration falls within a predetermined range that the collision stress generated when the outer wall of the end of the shaft collides with the inner wall of the hole of an impeller (rotating member) is equal to or smaller than a predetermined value, when the rotor is positioned.

主权项

1. A drive control device that controls the driving of a brushless motor having a stator on which multi-phase windings are wound, a rotor that is disposed to be rotatable relative to the stator, and a shaft that is disposed in the center of the rotor, has an end fitted into a hole of a rotating member and rotates together with the rotor, the drive control device comprising:
a control unit that operates an energization output including at least one of a current, a voltage and a power, and controls a power to be supplied to the windings to make the rotation of the rotor controllable, wherein the control unit includes:
a positioning unit that controls the power to be supplied to the windings to position the rotor at a drive start position which is a position of the rotor relative to the stator which can start the drive control of the brushless motor, before starting the drive control of the brushless motor; anda torque acceleration control unit that controls the power to be supplied to the windings to allow a torque acceleration, which is a time variation in a torque output from the shaft, to fall within a predetermined range that the collision stress generated when the outer wall of the shaft collides with the inner wall of the rotating member is equal to or smaller than a predetermined value, when the rotor is positioned by the positioning unit.