Patent ID: 8093774
Filing Date: 2012-01-10
Classification: H02K

Abstract:
1. A direct current motor comprising: a stator on which a plurality of coils is provided; a rotor including a plurality of magnetic poles that is provided so as to face an inner periphery of the stator; a current-carrying portion that is provided on one end portion of the rotor and commutates current supplied from a power source to the coils on the stator; a ball bearing that holds the rotor, the rotor pressing an upper face of an inner ring of the ball bearing; a bearing that holds the rotor and has a smaller load-bearing capacity than that of the ball bearing; a shaft that translationally moves in the axial direction of the rotor in accordance with rotation of the rotor; and a pressing member that is fixed to the other end portion of the rotor and presses a lower face of the inner ring of the ball bearing, wherein: the pressing member comprises a pipe that is attached to an inner side of the inner ring of the ball bearing, and a plate presses the inner ring of the ball bearing.