Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1998-02-09
2000-01-25
Nappi, Robert E.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, H02P 528
Patent
active
060182253
ABSTRACT:
A motor is reconnected to a motor drive by exciting the motor to induce a back EMF, determining a speed of rotation of the motor based on the induced back EMF induced, and reconnecting the motor drive to the motor based on the speed determined. In order to induce the back EMF, current which flows through the motor is controlled using first and second regulators. The outputs of the first and second current regulators are separated from each other in phase by approximately 90.degree.. A positive feedback loop is established by using the output of one of the first and second regulators to generate an input for the other one of the first and second regulators. The positive feedback loop advantageously causes the back EMF to continually increase as the motor continues to be excited, or at least not decay so rapidly that the speed of the motor cannot be accurately determined. Additionally, to determine the speed of the motor, the back EMF may be measured by commanding a current at a current command input of a current regulator, and then examining the voltage command output of the current regulator. Because the voltage command output is determined by the current regulator (e.g., in firmware or in software), there is no requirement for additional hardware to perform the voltage measurement.
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Allen-Bradley Company LLC
Duda Rina I.
Horn John J.
Luettgen David G.
Miller John M.
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