Patent ID: 7310002
Filing Date: 2007-12-18
Classification: G01R,H02P

Abstract:
1. A method of inspecting a plurality of motors having substantially the same structure each including a permanent magnet and coils wound with coil lead wires, which selected one of the permanent magnet and the coils constitutes a stator, and the other constitutes a rotor adapted to rotate with respect to the stator, wherein a relation between an elapsed time and a reduction in rotational speed during an inertial rotation is measured or estimated thereby to determine a deceleration function of at least one of the motors, the method comprising: a first step for electrically connecting terminals of the coil lead wires and a power supply for each of the motors, and rotating the rotor at a predetermined rotational speed with respect to the stator; a second step for inertially rotating the rotor with respect to the stator by electrically disconnecting the coil lead wires and the power supply immediately after the first step, and measuring a potential difference across the coil lead wires during the inertial rotation; and a third step for correcting the value of the potential difference generated during the constant rotation at each of a plurality of predetermined rotational speeds by corrective calculation of a measurement value of the potential difference based on the deceleration function.