Patent ID: 6225715
Filing Date: 2001-05-01
Classification: H02K

Abstract:
A motor having an internally built-in sensor for detecting the position or speed of the motor with, said motor being mounted in a motor frame and comprising a rotor having a rotor core, a rotor shaft and a stator having a stator core; windings wound on said stator core to form a rotational magnetic field, said rotor core having a substantially cylindrical recess provided therein with a diameter smaller than the outside diameter of said rotor, said motor frame having a portion extending into said cylindrical recess; and a bearing for rotatably supporting said rotor shaft, said bearing being mounted on said portion of said motor frame; wherein said sensor is located adjacent to said bearing within said motor for detecting the position or speed of said motor with said sensor including a fixed member and a movable member and having a trap separating said movable member from said fixed member.