Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1991-05-06
1993-02-16
Wysocki, A. Jonathan
Electricity: motive power systems
Induction motor systems
Primary circuit control
318254, H02F 700
Patent
active
051874199
ABSTRACT:
An electric induction motor is connected by a switch means to a source of three-phase alternating electricity. The speed of the motor is determined by detecting when the source voltage a zero crossing and thereafter sensing the polarity of the back emf voltage induced in each winding of the motor when the switch means is non-conductive. After several zero crossings a set of polarity samples has been produced from each winding. The motor speed is determined by detected the occurrence of a predefined relationship among samples in each set. For example, the speed is in the range of fifty to about thirty-eight percent of full synchronous speed when three consecutive samples from one winding all have the same polarity. The occurrence of the predefined relationship among back emf polarity samples can be used to control the braking of the motor.
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Allen-Bradley Company Inc.
Wysocki A. Jonathan
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