Spindle motor for a disc drive

Details Spindle motor for a disc drive Spindle motor for a disc drive

1987-11-02

1989-06-20

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 9904, 318254, 310 68R, G11B 1500

Patent

active

048413933

ABSTRACT:
A spindle motor for use in a disc drive including a base casting for the drive, the motor comprising a shaft extending through the base casting and carrying a hub supporting one or more discs for rotation, the shaft being supported for rotation in the casting by one or more bearings, rotation of the shaft being controlled by an axial air gap motor comprising a flat rotor connected to the shaft and extending axially parallel to the base casting of the housing, the rotor comprising a magnet supported by a rotor support plate carried on an end of the shaft, a single printed board is supported so as to have first and second surfaces essentially out of contact with the base casting and the rotor support plate for supporting on one surface thereof a plurality of axially oriented coils in a toroidal path around the shaft and in a plane parallel to the magnet, and on the other of the surfaces a toroidal magnetic return path element mounted on the opposite side of the axially oriented coils from the rotor, the magnetic return path being formed of a wound coil of thinly sliced sheet steel, thereby forming a magnetic path comprising the magnet, the coils and the return path element, whereby a low profile spindle motor is achieved.

REFERENCES:
patent: 4568847 (1986-02-01), Schmider
patent: 4568862 (1986-02-01), Tassinario
patent: 4633149 (1986-12-01), Welterlin

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