Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2006-03-21
2006-03-21
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S811000, C318S807000, C363S132000
Reexamination Certificate
active
07015673
ABSTRACT:
A method and apparatus is disclosed for reducing the heat generated by three-phase motors operating under load in cooled chambers such as industrial walk-in refrigerators and freezers. Specific control elements are introduced into the three power conductors connected to a three-phase motor, the elements chosen so as to cause the motor to turn at a speed below a certain critical speed, above which the elements have no control over the motor power used or the motor speed. The results of inserting the control elements into the motor power conductors are (1) the motor turns at a reduced speed and (2) the heat generated by the motor is reduced. In addition, the control elements themselves are specifically chosen and are of such a nature that they generate virtually no heat in the process of reducing the power supplied to the motor.
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