Motor for use in information recording device

Details Motor for use in information recording device Motor for use in information recording device

1997-04-18

1999-03-09

Sircus, Brian

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 318432, 369263, H02P 800

Patent

active

058805699

ABSTRACT:
An information recording device is provided, whereby an inexpensive stepping motor is used to drive a recording disk for recording information, the disk being driven under open-loop control by means of inexpensive digital circuit technology, without employing rotor position detectors or a speed detector, and the rotational accuracy of the recording disk is raised to a level suitable for application, without increasing cost, by constituting the aforementioned step operation (having poor rotational accuracy) inherent in the stepping motor such that certain relationships are formed between the structural parameters of the information recording device and the structural parameters of the motor. In a stepping motor, electrical energy is supplied by switching excitation at a timing synchronized to an input clock, regardless of the load. When this electrical energy is converted to mechanical energy, the moment of inertia of the rotating portion is exploited to a maximum in order to produce smooth rotation.

REFERENCES:
patent: 4115726 (1978-09-01), Patterson et al.
patent: 5048005 (1991-09-01), Ekhoff
patent: 5304879 (1994-04-01), Suzuki et al.
patent: 5321340 (1994-06-01), Tamaki et al.
patent: 5528570 (1996-06-01), Kondo
patent: 5691583 (1997-11-01), Suzuki et al.

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