Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1986-02-10
1987-04-07
Dobeck, Benjamin
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318317, H02P 516
Patent
active
046564020
ABSTRACT:
In the present invention, in an electric motor control apparatus wherein a load current modulated in a pulse form and flowing in an electric motor is detected, and the load current is controlled by varying a pulse width of the load current so that an average value of the load current follows a command value, the electric control apparatus includes switching means for modulating a direct current supplied to the electric motor from a DC power supply to form the load current, a current detector for detecting the load current flowing in the electric motor, an average load current detecting means for detecting the average value of the load current by inputting from the current detector a load current at a time point after the switching means is rendered conductive and after the lapse of a predetermined time which varies in accordance with an "on" time of the switching means, and by assuming the inputted load current as the average value of the load current to be detected, an "on" time calculating means for determining the "on" time of the switching means in the next period based on the average value of the load current detected by the average load current detecting means and the command value, and a switching control section for on-off controlling the switching means in accordance with a commanded period and the "on" time calculated by the "on" time calculating means.
REFERENCES:
patent: 3911341 (1975-10-01), Carlson et al.
patent: 4037145 (1977-07-01), Bailey et al.
patent: 4074175 (1978-02-01), Born et al.
patent: 4389602 (1983-06-01), Post
patent: 4500830 (1985-02-01), Gotou et al.
Dobeck Benjamin
Nippondenso Co. Ltd.
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