Method and apparatus for monitoring the rotating frequency of de

Details Method and apparatus for monitoring the rotating frequency of de Method and apparatus for monitoring the rotating frequency of de

1996-05-02

1998-02-03

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318459, 318500, 324177, G01P 346

Patent

active

057148627

ABSTRACT:
The rotational speed of a coasting induction motor is measured by sensing e residual electrical voltages at the power terminals of the motor, thus eliminating the need for conventional tachometer equipment, additional mechanical components or modifications to the induction motor itself. The power terminal voltage signal is detected and transformed into a DC voltage proportional to the frequency of the signal. This DC voltage can be input to the control system of a variable frequency motor controller to regulate the output characteristics thereof relative to the speed of the coasting motor.

REFERENCES:
patent: 3626264 (1971-12-01), Halfhill et al.
patent: 4078194 (1978-03-01), Johnson, Jr.
patent: 4204425 (1980-05-01), Mallick, Jr.
patent: 4241299 (1980-12-01), Bertone
patent: 4291260 (1981-09-01), Nixon
patent: 4893067 (1990-01-01), Bhagwat et al.
patent: 5440219 (1995-08-01), Wilkerson
patent: 5473725 (1995-12-01), Chen et al.

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