Motor controller

Details Motor controller Motor controller

H - Electricity

02

P

318/50

H02P 1/04 (2006.01) H02H 6/00 (2006.01) H02H 7/085 (2006.01) H02K 11/00 (2006.01) H02P 1/16 (2006.01) H02P 1/26 (2006.01) H02P 23/00 (2006.01)

Patent

CA 1297527

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. 0878B

601808

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