Floppy disk drive revolution detector avoiding interference with

Details Floppy disk drive revolution detector avoiding interference with Floppy disk drive revolution detector avoiding interference with

1990-02-09

1993-08-03

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420713, 324175, G01B 714, G01P 336

Patent

active

052332969

ABSTRACT:
In a revolution detector of a drive motor of a disk drive, the rotor of the drive motor comprises a shell and a rotary magnet which is secured to the shell. A plurality of through holes of the detector, in which the rotary magnet is partially exposed, are provided at predetermined intervals in such positions of the shell as to give no influence to the magnetic circuit from which the output of the drive motor is derived, and the revolution characteristic of the drive motor is obtained by means of detecting the holes by a sensor in the detector, so that it becomes easier to manufacture the detector, and it is possible to detect the revolution of the drive motor with high accuracy without lowering the efficiency of the drive motor.

REFERENCES:
patent: 3231807 (1966-01-01), Willis
patent: 4455516 (1984-06-01), Furusho
patent: 4529903 (1985-07-01), Takahashi et al.
patent: 4611168 (1986-09-01), Kudelski et al.

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