Importance

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Abstract

A flat motor suitable for driving the fan of an internal combustion engine includes a stationary cover member in the form of a disk adapted to be fixedly secured to a stationary support and a shaft secured at one end to the center of the cover member. A permanent magnet ring is secured to the cover member about the shaft and a rotor of synthetic resin material having an electric coil embedded therein is rotatably mounted on a shaft by means of a ball bearing which supports the entire weight of the shaft. A commutator ring assembly is secured to one side of the rotor and a bearing sleeve is mounted between the commutator ring and the shaft. A yoke is provided on the opposite side of the electrical coil from the permanent magnet and may be comprised of a plurality of disks of magnetic material secured in the resin material. A disk of soft magnetic material having a fan assembly integrally molded about the outer periphery thereof is secured to the rotor in engagement with the disk comprising the yoke. The disk could be eliminated and the fan supporting disk could be disposed in contact with the rotor adjacent the electric coil to act as the yoke.

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First Claim