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Title:
ROTATION DRIVING MOTOR OF RECORDING DISC
Document Type and Number:
Japanese Patent JPS59113568
Kind Code:
A
Abstract:

PURPOSE: To make a recording disc device small in size, by notching a part of a stator as a radial feeding unit storage space to prevent a radial feeding unit from being projected from a recording disc.

CONSTITUTION: A stator 7 constituting a rotation driving motor is partially notched into a fan shape, and one ends of radial feeding units 3a and 3c are inserted to this cut open part 80. If the stator 7 is expanded linearly, it has a comb-shaped block form as shown in Fig. When three-phase sinewave currents whose phases are shifted from one another by 60° are applied to terminals T1, T2, and T3, a sine-shape shifting magnetic field is generated in the part of the stator 7. The shifting magnetic field is formed with lines of magnetic force passing through comb teeth of the stator 7, a rotor 8, an opposite magnetic plate 9, etc. An eddy current is generated in the direction accordant to the right-hand rule in the place where the line of magnetic force pass through the rotor 8, and an electromagnetic force is generated between this eddy current and the line of magnetic force, and the rotor 8 is rotated by this electromagnetic force. Its direction is accordant to the left-hand rule.


Inventors:
Koide, Hiroshi
Application Number:
JP1982000223306
Publication Date:
June 30, 1984
Filing Date:
December 20, 1982
Export Citation:
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Assignee:
RICOH CO LTD
International Classes:
H02K17/02; G11B17/028; G11B19/20; G11B25/04; H02K26/00; H02K41/025; (IPC1-7): G11B19/20; H02K17/02; H02K26/00



 
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