Controller for electric power steering apparatus

[0029] figure 1 The illustrated rack and pinion type electric power steering device 101 for a vehicle has a steering shaft 103 that is rotated by manipulation; a pinion 103a provided on the steering shaft 103; a rack 104 that meshes with the pinion 103a; A three-phase brushless motor for power 1. Both ends of the rack 104 are connected with steering wheels (not shown). As the steering pinion 103a rotates, the rack 104 moves in the long axis direction along the vehicle width direction, and the steering angle is changed by the movement of the rack 104 .

[0030] The motor 1 has a stator 1a including coils of U, V, and W phases fixed to a housing 108 covering a rack 104; a cylindrical rotor 1b rotatably supported on the housing 108 via bearings 108a, 108b. ; the magnet 1c attached to the rotor 1b; and the resolver 2 constituting a rotational position detection unit for detecting the rotational position of the rotor 1b, and the rack 104 is surrounded by the rotor 1b. The screw mec