Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1992-09-25
1994-05-03
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318599, 318811, 388819, H02P 122
Patent
active
053090772
ABSTRACT:
An apparatus and a method for loading a cassette tape in a video equipment, in which driving of a DC motor can be controlled according to an amount of load which is applied to the DC motor when the cassette tape is loaded. The apparatus include a rotation speed signal detecting circuit for detecting a signal corresponding to a rotation speed of the DC motor, an amplifying circuit for amplifying the detected rotation speed signal from the rotation speed signal detecting circuit by a predetermined amplification degree, a limiting circuit for inputting an output signal from the amplifying circuit and passing only signal components between predetermined maximum and minimum values, a comparison circuit for comparing an output signal from the limiting circuit with a predetermined reference signal and outputting a logic signal in accordance with the compared result, a reference signal generating circuit for feeding the predetermined reference signal to the comparison circuit, a PWM signal generating circuit for outputting a PWM signal of a desired duty ratio in accordance with the logic signal from the comparison circuit, and a smoothing circuit for smoothing the PWM signal from the PWM signal generating circuit and outputting the smoothed signal as a drive signal to the DC motor.
REFERENCES:
patent: 3710216 (1973-01-01), Smith
patent: 4605887 (1986-08-01), Boella et al.
patent: 4893067 (1990-01-01), Bhagwot et al.
patent: 5001407 (1991-03-01), Suzuki et al.
Cabeca John W.
Gold Star Co. Ltd.
Shoop Jr. William M.
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