Patent ID: 8154231
Filing Date: 2012-04-10
Classification: B62D,H02P

Abstract:
1. A motor controller that controls a motor provided with a rotor and a stator opposing the rotor, comprising: a rotation speed detecting portion that detects the rotation speed of the rotor or a member that rotates together with the rotor; a low speed region position estimating portion which is designed to be suitable for a predetermined low speed region and estimates the rotational position of the rotor; a high speed region position estimating portion which is designed to be suitable for a predetermined high speed region and estimates the rotational position of the rotor; and a rotational position calculating portion which obtains the rotational position of the rotor based on i) the rotation speed detected by the rotation speed detecting portion and without reference to an estimated rotational position of the rotor estimated by either of the low speed region position estimating portion and the high speed region position estimating portion, ii) the rotational position of the rotor estimated by the low speed region position estimating portion, and iii) the rotational position of the rotor estimated by the high speed region position estimating portion.