Device for controlling rotational speed of motor

Details Device for controlling rotational speed of motor Device for controlling rotational speed of motor

1990-11-29

1992-07-14

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318606, 318599, 318811, 388813, G05B 102

Patent

active

051306263

ABSTRACT:
A device for controlling the rotational speed of a motor carries out feedback control by a speed difference control signal and a phase difference control signal. A first time period from a reference time point to a time when a newest detection pulse is outputted is calculated every time a predetermined number of detection pulses are counted by detection pulse counters. A second time period from the reference time point to the time when a command pulse, which is assigned an ordinal number equal to the ordinal number of the newest detection pulse and which thereby corresponds to the newest detection pulse, is calculated on the basis of the total number of pulses counted by the detection pulse counters in the time period from the reference time point to the time when the newest detection pulse is outputted, and the period of the command pulse. The phase difference between the newest detection pulse and the command pulse corresponding thereto is calculated on the basis of the first time period and the second time period and the period of the command pulse. A phase difference control signal proportional to the phase difference calculated is thus determined.

REFERENCES:
patent: 4599545 (1986-07-01), Moriki et al.
patent: 4639649 (1987-01-01), Seto
patent: 4902949 (1990-02-01), Hirata
patent: 4933985 (1990-06-01), Fukushima
patent: 4950968 (1990-08-01), Ogura

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