Electricity: motive power systems – Automatic and/or with time-delay means – Responsive to thermal conditions
Patent
1988-06-22
1990-07-03
Smith, Jr., David
Electricity: motive power systems
Automatic and/or with time-delay means
Responsive to thermal conditions
361 24, 361 25, 318798, 318806, H02P 318, H02P 104
Patent
active
049394371
ABSTRACT:
An apparatus for starting and controlling a motor. The apparatus includes means for monitoring the load current values in each phase of a motor. These means can include an apparatus such as a current transformer. The apparatus utilizes a circuit for modeling a motor and estimating the temperatures of the motor's windings and housing. THe circuit preferably is defined by a programmed microprocessor. The estimated temperatures are based on the load current values and time. These estimated temperatures are then compared to allowable limits and, based on the comparison, the motor is either stopped or allowed to run.
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Bartheld Robert G.
Farag Samir F.
La Valva Mario
Thiele Tom N.
Morrow James G.
Siemens Energy & Automation Inc.
Smith Jr. David
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