Electricity: motive power systems – Alternating current commutating motors – Universal or a.c.-d.c. motors
Patent
1996-04-25
1999-11-16
Shoop, Jr., William M.
Electricity: motive power systems
Alternating current commutating motors
Universal or a.c.-d.c. motors
318798, 318815, 318439, H02P 124
Patent
active
059864176
ABSTRACT:
A circuit and method for controlling the speed of a universal motor driven by an AC source is disclosed. The method includes the steps of measuring a value of a temporal property of a current through the motor and determining a speed of rotation of the universal motor using the temporal property. The method for controlling the speed of the universal motor further includes comparing the determined speed of rotation with a desired speed of rotation and adjusting the current through the motor so that the speed of the motor approaches the desired speed of rotation.
REFERENCES:
patent: 4266177 (1981-05-01), Nola
patent: 4527101 (1985-07-01), Zavis et al.
patent: 4673860 (1987-06-01), Machuron
patent: 4958118 (1990-09-01), Pottebaum
patent: 5440219 (1995-08-01), Wilkerson
patent: 5736828 (1998-04-01), Turner et al.
patent: 5760553 (1998-06-01), Astic et al.
Bailly Alain
Nicolai Jean
Lockett Kim
SGS-Thomson Mocroelectronics S.A.
Shoop Jr. William M.
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