Device and a method for estimating the speed of a slip ring...

Details Device and a method for estimating the speed of a slip ring... Device and a method for estimating the speed of a slip ring...

2006-02-07

2006-02-07

Fletcher, Marlon T. (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S805000, C318S822000, C318S798000

Reexamination Certificate

active

06995539

ABSTRACT:
The invention relates to a device and a method for estimating the speed of a slip ring asynchronous machine. The asynchronous machine includes a stator having a stator winding, arranged to be fed with three-phase voltage and current in order to generate a varying magnetic flux, and a rotor having a rotor winding in which the magnetic flux is arranged to induce a voltage to create an electromagnetic torque. The device includes a measuring member arranged to measure the value of the voltage in the rotor winding during at least one time period and a calculating unit, which is arranged, using the above measured voltage, to calculate a value of the rotor speed.

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