Electricity: motive power systems – Limitation of motor load – current – torque or force
Patent
1996-10-25
1998-12-22
Masih, Karen
Electricity: motive power systems
Limitation of motor load, current, torque or force
318254, 318138, 318798815-, H01R 3946
Patent
active
058523499
ABSTRACT:
An integrated circuit for driving a three-phase motor in response to a single signal of the three-phase signals to be applied to stator coils of the motor. The circuit comprises a first amplifier for amplifying the single signal on the basis of a first inverse phase signal, which is a 180.degree. phase-shifted signal relative to the single signal, and outputting a first amplified phase signal. A first phase shifter receives the first phase signal and generates a second phase signal in response to the first phase signal, the second phase signal having a phase difference of 120.degree. relative to the first phase signal. A second phase shifter receives the first inverse phase signal and generates a second inverse phase signal in response to the first inverse phase signal, the second inverse phase signal having a phase difference of 120.degree. relative to the first inverse phase signal. A second amplifier amplifies the second phase signal on the basis of the second inverse phase signal and outputs a second amplified phase signal which is a 120.degree. phase-shifted signal relative to the first amplified phase signal. Finally, an output control receives the first and second amplified phase signals and produces a third phase signal, having a phase difference of 120.degree. relative to each of the first and the second phase signals, by means of a control logic thereof to output the three-phase signals. This three-phase signal can then be applied to stator coils of the three-phase motor to drive it efficiently.
REFERENCES:
patent: 4074173 (1978-02-01), Janssen
patent: 4658190 (1987-04-01), Miyazaki et al.
patent: 5182500 (1993-01-01), Shimada
patent: 5378976 (1995-01-01), Inaji et al.
patent: 5477099 (1995-12-01), Suganuma
Masih Karen
Samsung Electronic Co. Ltd.
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