Patent ID: 7397155
Filing Date: 2008-07-08
Classification: H02K

Abstract:
1. A drive unit comprising: a motor including one rotor having a plurality of permanent magnets, and a stator having an air core coil, wherein a rotating magnetic field is formed between the permanent magnets and the air core coil by performing an energization control of the air core coil to rotate the rotor on a rotor shaft; a power transmission mechanism to transmit a rotational force of the motor to a member, and a casing to receive the motor and the power transmission mechanism, and a solar battery as a power source for the motor, wherein the permanent magnets are arranged at equal intervals along the circumferential direction of the rotor shaft, wherein the air core coil is arranged with a central axis thereof being parallel to the rotor shaft, and a winding of the air core coil is spaced from and opposed to an end face of each of the permanent magnets, and wherein a part of the rotor, excluding the permanent magnets and the rotor shaft, and the power transmission mechanism and the casing are made of a nonmagnetic material.