Modified field oriented control

1. A method of controlling an induction machine, comprising:

determining full rated flux-current and torque-current vectors in accordance with a field oriented control scheme and based on design parameters of the induction machine;

generating an output signal representative of an output flux-current vector, wherein the output flux-current vector is based on the full rated flux-current vector and a predetermined flux-current reduction factor; and

controlling an alternating current (ac) power source to the induction machine based on the determined full rated torque-current vector and the generated output flux-current vector.

2. The method as recited in claim 1 , comprising controlling a pulse width modulated (PWM) ac power source based on the determined full rated torque-current vector and the generated output flux-current vector.

3. The method as recited in claim 1 , comprising generating an output torque-current vector, and adjusting the output torque-current or output flux-current vectors or any combination thereof based on feedback signals from the induction machine.

4. The method as recited in claim 3 , comprising adjusting the output torque-current vector or the output flux-current vector or any combination thereof based on a current feedback signal representative of output current from the ac power source.

5. The method as recited in claim 3 , comprising adjusting the output torque-current vector or the output flux-current vector or any combination thereof based on an operating parameter of the induction machine.

6. The method as recited in claim 5 , wherein the output parameter of the induction device comprises an operating speed of the induction machine.

7. A method of controlling an induction device, comprising:

determining a full rated d-axis current vector and a q-axis current vector based upon a field-orientated-control scheme and design parameters of the induction device;

determining a d-axis output current vector based on the full-rated d-axis current vector and a predetermined flux-current reduction factor;

resolving the q-axis current vector and the d-axis output current vector into a-, b-, and c-axis current vectors; and

providing alternating current (ac) power to the induction device in accordance with the a-, b-, and c-axis current vectors.

8. The method as recited in claim 7 , comprising controlling a pulse width modulated (PWM) power source.

9. The method as recited in claim 7 , comprising dynamically adjusting the d-axis and q-axis current vectors based on feedback parameters from the induction device.

10. The method as recited in claim 7 , comprising dynamically adjusting the d-axis and q-axis current vectors based on feedback parameters based on the provided ac power.

11. The method as recited in claim 7 , comprising determining the reduction factor based on historical data of the induction device.

12. The method as recited in claim 7 , comprising providing dc power to a pulse width modulating (PWM) power source.

13. The method as recited in claim 12 , comprising rectifying an ac power signal to produce the provided dc power.

14. An induction system, comprising:

an induction device comprising a stator core having a plurality of stator windings extending therethrough and a rotor disposed concentric to the stator core;

an alternating current (ac) power source configured to provide three-phase ac power to the stator windings;

a controller configured to command the ac power source, and

a system commander configured to determine a-, b-, and c-axis vectors of the three-phase ac power in response to provided flux-current and torque-current vectors to command the controller, wherein the system commander is configured to determine the provided flux-current and stator-current vectors in accordance with a field oriented control scheme and based on design parameters of the induction device, the flux-current vector also being based on a predetermined reduction factor.

15. The induction system as recited in claim 14 , comprising a transformation object configured to transform the flux-current vector and the stator-current vector into the a-, b-, and c-axis vectors.

16. The induction system as recited in claim 14 , wherein the rotor is mechanically coupled to a flywheel.

17. The induction system as recited in claim 14 , comprising a sensor configured to determine an operating speed of the rotor.

18. The induction system as recited in claim 14 , wherein the ac power source comprises a pulse width modulated (PWM) power source.

19. A system controller for an induction device, comprising:

a processor; and

a modeling object stored on one or more tangible media coupled to the processor, and operable with the processor to produce full rated flux-current and torque-current vectors based on a field oriented control scheme and design parameters of the induction device, wherein the modeling object is configured to produce a flux-current output vector based on the full rated flux-current vector and a predetermined flux-current reduction factor.

20. The system controller as recited in claim 19 , comprising transformation objects.

21. A tangible medium comprising computer program for operating an induction machine, the computer program comprising:

code for determining full rated flux-current and full rated torque-current vectors in accordance with a field-oriented-control scheme and based on design parameters of the induction machine;

code for determining an output flux-current vector, wherein the output flux-current vector is based on the full rated flux-current vector and a predetermined flux-current reduction factor; and

code for producing an output signal to control an alternating current (ac) power source to the induction machine based on the determined full rated torque-current vector and the determined output flux-current vector.

22. The computer program as recited in claim 21 , comprising code for transforming the output flux current vector and full rated torque-current vector into a-, b-, and c-axis vectors.