Patent ID: 6737778
Filing Date: 2004-05-18
Classification: H02K

Abstract:
A pulley driving system comprising:a rotary shaft having an axial direction; a plurality of motor sections, each motor section including a rotor and a stator facing each other, the rotors of the individual motor sections being fixedly mounted in series on the rotary shaft; a pulley section arranged in series with the rotors in the axial direction of the rotary shaft and fixedly mounted on the rotary shaft, the pulley section having a smaller outside diameter than the motor sections; and power supplies for driving the multiple motor sections independently of one another, wherein at least one of groups of the stators and groups of the rotors have cores, each core being divided into multiple core blocks, the blocks being arranged along a circumferential direction of the rotary shaft and welded into a single structure, welded joints of the cores of the individual motor sections being located at the same angular positions with respect to magnetic poles of common polarity, and relative angles of the magnetic poles of common polarity on the rotor and the stator of the individual motor sections, along the circumferential direction of the rotary shaft, differs for respective individual motor sections.