Method and apparatus for RMS measurements in induction motor wit

Details Method and apparatus for RMS measurements in induction motor wit Method and apparatus for RMS measurements in induction motor wit

1994-07-26

1995-12-05

Martin, David S.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318799, H02P 528

Patent

active

054732417

ABSTRACT:
A method and/or apparatus used with a motor controller for finding RMS current and RMS terminal voltage in a three phase AC induction motor using electrical values known to the controller. An equation relates average current to RMS current as a function of the duration of a known non-conducting period. Another equation relates known voltages to RMS terminal voltage as a function of a known phase angle and the known duration of the non-conducting period in a supply line.

REFERENCES:
patent: 3714533 (1973-01-01), Unnewehr
patent: 4689543 (1987-08-01), Hucker
patent: 4757242 (1988-07-01), Prather
patent: 4939437 (1990-07-01), Farag et al.
patent: 5057760 (1991-10-01), Dadpey et al.

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