Sensorless universal motor speed controller

Details Sensorless universal motor speed controller Sensorless universal motor speed controller

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.

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