Rotation speed search apparatus for increasing an output...

Details Rotation speed search apparatus for increasing an output... Rotation speed search apparatus for increasing an output...

2005-05-31

2005-05-31

Martin, David (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S773000, C318S807000, C318S821000

Reexamination Certificate

active

06900614

ABSTRACT:
A rotation speed search apparatus for an induction motor includes: a voltage control unit for comparing a rated current of a motor and a current detected from the motor and generating an output voltage; and a frequency control unit for comparing a reference excitation current of the motor and an excitation current detected from the motor and generating an output frequency. In case of a big load, an output frequency is reduced. Thus, the slip of the motor is moved to a slip where a maximum torque is generated to enable the induction motor to start. If the speed of the motor in operation is greater than a target frequency, an output frequency is increased, so that the motor can be operated even in the regenerative region of the motor.

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