Apparatus and method for measuring variable frequency power

Details Apparatus and method for measuring variable frequency power Apparatus and method for measuring variable frequency power

1987-07-22

1988-08-16

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Polyphase

324105, 324142, G01R 2108, G01R 2114

Patent

active

047647205

ABSTRACT:
Disclosed is an apparatus and method for sensing power in a variable frequency machine. The power is sensed in each phase of the three phase machine by utilizing Hall generators for multiplying the phase current flowing through each phase by a current proportional to a phase voltage for each phase. The products are then summed to obtain a reading of the instantaneous power drawn by the three phase machine. The AC component is filtered out of the summed signal using a multi-stage filter which allows for maintaining of a fast response time with low ripple. In a preferred embodiment, a four stage filter utilizing R.C. filters is employed for this purpose.

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Borg-Warner Electronics Corporation, "Power Plus AC Drive", pp. 1-8.

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