Speed detecting device

Details Speed detecting device Speed detecting device

1986-12-05

1987-08-25

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Multiple mode systems

318653, 318616, G05B 1118

Patent

active

046895396

ABSTRACT:
A speed detecting device for an electric motor in which the angular stopping position of a rotary shaft is controlled with a high precision. A magnet is mounted on a rotary shaft of the motor, and a position detector detects the position of the magnet as rotated by the motor, thereby producing an output signal having a linear region. A speed calculator samples this signal in the liner region at predetermined time intervals and performs a division operation whereby a difference between a present sampled value and a preceding sampled value of the output signal is divided by the time interval, thereby to produce a speed signal which is applied to the motor as a control signal.

REFERENCES:
patent: 3906326 (1975-09-01), Chur
patent: 4006394 (1977-02-01), Cuda
patent: 4258301 (1981-03-01), Kawa
patent: 4272710 (1981-06-01), Duill et al.
patent: 4403181 (1983-09-01), Kohzai
patent: 4491776 (1985-01-01), Veale
patent: 4503374 (1985-03-01), Sakano
IBM Technical Disclosure Bulletin, vol. 21, No. 8, Jan. 1979, N. K. Arter et al.

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