Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1985-08-14
1987-04-28
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318305, 318327, 318309, 318599, H02P 500
Patent
active
046617507
ABSTRACT:
A device for controlling a DC motor to establish a target speed, comprising: a speed setter for providing plural command values of speed of the DC motor; a speed selector for selecting one of the plural command values; a current regulator for controlling an amount of electric current to be applied to the DC motor so that a value of a feedback signal corresponding to a current speed of the DC motor coincides with the command value of speed selected by said selector; and a controller for controlling the selector to select a first command value of the plural command values for a first time span of a cyclic control time which is determined as a function of a period of the feedback signal, and to select a second command value of the plural command values for a second time span which is a remainder of the cyclic time. The target speed falls within a range defined by the first and second command values. The controller determines a ratio of the first time span to the second time span so that the target speed is established. The controller may change the first time span so that the current speed of the DC motor coincides with the target speed.
REFERENCES:
patent: 3349309 (1967-10-01), Dannettell
patent: 3950683 (1976-04-01), Lamson
patent: 4280082 (1981-07-01), Acharya et al.
patent: 4291259 (1981-09-01), Marumoto et al.
patent: 4449082 (1984-05-01), Webster
patent: 4554492 (1985-11-01), Karpowicz et al.
patent: 4578621 (1986-03-01), Nordlof
Brother Kogyo Kabushiki Kaisha
Ro Bentsu
Shoop Jr. William M.
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