Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1995-09-29
1997-05-06
Ip, Paul
Electricity: motive power systems
Induction motor systems
Primary circuit control
318810, 318138, 318254, H02P 540
Patent
active
056274475
ABSTRACT:
A method and apparatus to be used with an inverter based motor controller for determining current phase angles for the current on a single phase of a three phase AC motor from an inverter generated high frequency phase voltage sequence. The invention detects turn on delay periods and compares phase voltages during consecutive turn on delay periods to determine phase current zero crossing times which can be used along with phase voltage zero crossing times to derive current phase angle information.
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Tao Jinghan
Unsworth Peter J.
Allen-Bradley Company Inc.
Horn John J.
Ip Paul
Jaskolski Michael A.
Miller John M.
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