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Method for providing current regulation and a current controller (10) for an electric machine (30) are provided. The method includes receiving a state vector time signal (36) indicative of a time interval when a switching state vector is activated and comparing the received state vector time signal

Method for providing current regulation and a current controller (10) for an electric machine (30) are provided. The method includes receiving a state vector time signal (36) indicative of a time interval when a switching state vector is activated and comparing the received state vector time signal to a commanded state vector time signal (38). The method further includes using the result of the comparison to regulate a direct axis current signal (42, 44) input to an electric machine controller. The current controller (10) includes a state vector error comparator for comparing a received state vector time signal to a commanded state vector time signal and generating a state vector time error. This error is processed by a PI controller, coupled to the state vector error comparator, for providing a direct axis current signal output responsive to the state vector time error to an electric machine.

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1. A method for controlling current in an electric machine comprising:receiving a state vector time signal from a space vector modulator indicative of a time interval when a switching state vector is activated; comparing the received state vector time signal to a commanded state vector time signal;

1. A method for controlling current in an electric machine comprising:receiving a state vector time signal from a space vector modulator indicative of a time interval when a switching state vector is activated; comparing the received state vector time signal to a commanded state vector time signal; and using the result of the comparison to regulate a direct axis current signal input to a machine controller. 2. The current control method of claim 1, wherein the electric machine is a vector controlled machine.3. The current control method of claim 1, wherein the electric machine is a power converter controlled machine.4. The current control method of claim 1, wherein the state vector time signal comprises a zero vector time signal indicative of a time interval when a zero vector is activated.5. The current control method of claim 1, wherein the state vector time signal comprises a sum of a first and second space vector time signals indicative of a respective time interval when the first and second space vectors are activated.6. The current control method of claim 1, further comprising filtering the received state vector time signal.7. The current control method of claim 1, further comprising using the received state vector time signal as a feedback signal in a commanded direct axis current control loop.8. The current control method of claim 1, further comprising generating a state vector time error signal.9. The current control method of claim 8, wherein generating a state vector time error signal further comprises subtracting the received state vector time signal from the commanded state vector time signal.10. The current control method of claim 8, wherein generating a state vector time error signal further comprises subtracting the commanded state vector time signal from the received state vector time signal.11. The current control method of claim 8, further comprising:generating a proportional-integral state vector error signal comprising proportional and integral components; detecting a condition when the proportional-integral state vector error signal has a value equal to or greater than a commanded direct axis current signal; and applying the commanded direct axis current signal to the direct axis current input of the machine controller when the proportional-integral state vector error signal has a value equal to or greater than the commanded direct axis current signal. 12. The current control method of claim 11, further comprising:limiting the proportional-integral state vector error signal to generate a direct axis current signal; and applying the direct axis current signal to the direct axis current input of the machine controller. 13. The current control method of claim 12, wherein limiting the proportional-integral state vector error signal further comprises limiting the proportional-integral state vector error signal to a value of less than the commanded direct axis current signal.14. A method for controlling current in an electric machine comprising:receiving a state vector time signal indicative of a time interval when a switching state vector is activated; comparing the received state vector time signal to a commanded state vector time signal; using the result of the comparison to regulate a direct axis current signal input to a machine controller; generating a state vector time error signal; generating a proportional-integral state vector error signal comprising proportional and integral components; detecting when the proportional-integral state vector error signal has a negative value; generating a direct axis current signal by adding the proportional-integral state vector error signal to the commanded direct axis current signal; and applying the direct axis current signal to the direct axis current input of the machine controller when the proportional-integral state vector error signal has a negative value. 15. A method for controlling current in an electric machine comprising:receiving a state vector time signal indicative of a time interval when a switching state vector is activated; comparing the received state vector time signal to a commanded state vector time signal; using the result of the comparison to regulate a direct axis current signal input to a machine controller; generating a state vector time error signal; generating a proportional-integral state vector error signal comprising proportional and integral components; detecting when the proportional-integral state vector error signal has a negative value; generating a direct axis current signal by adding the proportional-integral state vector error signal to the commanded direct axis current signal; applying the direct axis current signal to the direct axis current input of the machine controller when the proportional-integral state vector error signal has a negative value; and wherein applying the direct axis current signal further comprises closing a commanded direct axis current control loop. 16. A method for controlling current in an electric machine comprising:receiving a state vector time signal indicative of a time interval when a switching state vector is activated; comparing the received state vector time signal to a commanded state vector time signal; using the result of the comparison to regulate a direct axis current signal input to a machine controller; generating a state vector time error signal; generating a proportional-integral state vector error signal comprising proportional and integral components; detecting when the proportional-integral state vector error signal has a positive value; and applying a commanded direct axis current signal to the direct axis current input of the machine controller when the proportional-integral state vector error signal has a positive value or zero value. 17. A method for controlling current in an electric machine comprising:receiving a state vector time signal indicative of a time interval when a switching state vector is activated; comparing the received state vector time signal to a commanded state vector time signal; using the result of the comparison to regulate a direct axis current signal input to a machine controller; generating a state vector time error signal; generating a proportional-integral state vector error signal comprising proportional and integral components; detecting when the proportional-integral state vector error signal has a positive value; applying a commanded direct axis current signal to the direct axis current input of the machine controller when the proportional-integral state vector error signal has a positive value or zero value; generating a proportional-integral state vector error signal comprising proportional and integral components; limiting the proportional-integral state vector error signal to generate a limited proportional-integral state vector error signal; generating a direct axis current signal by adding the limited proportional-integral state vector error signal to a commanded direct axis current signal; and applying the direct axis current signal to the direct axis current input of the machine controller. 18. A method for controlling current in an electric machine comprising:receiving a state vector time signal indicative of a time interval when a switching state vector is activated; comparing the received state vector time signal to a commanded state vector time signal; using the result of the comparison to regulate a direct axis current signal input to a machine controller; generating a state vector time error signal; generating a proportional-integral state vector error signal comprising proportional and integral components; detecting when the proportional-integral state vector error signal has a positive value; applying a commanded direct axis current signal to the direct axis current input of the machine controller when the proportional-integral state vector error signal has a positive value or zero value; generating a proportional-integral state vector error signal comprising proportional and integral components; limiting the proportional-integral state vector error signal to generate a limited proportional-integral state vector error signal; generating a direct axis current signal by adding the limited proportional-integral state vector error signal to a commanded direct axis current signal; applying the direct axis current signal to the direct axis current input of the machine controller; and wherein limiting the proportional-integral state vector error signal further comprises limiting the proportional-integral state vector error signal to a value of less than or equal to zero. 19. A current controller for an electric machine comprising:a space vector modulator generating a state vector time signal indicative of a time interval when a switching state vector is activated; a state vector error comparator for comparing the state vector time signal received from the space vector modulator to a commanded state vector time signal and generating a state vector time error signal; and a control element, coupled to the state vector error comparator, for providing a direct axis current signal, responsive to the state vector time error, to a machine controller. 20. The current controller of claim 19, wherein the electric machine is a vector controlled machine.21. The current controller of claim 19, wherein the electric machine is a power converter controlled machine.22. The current controller of claim 19, wherein the received state vector time signal comprises a zero vector time signal indicative of a time interval when a zero vector is activated.23. The current controller of claim 19, wherein the received state vector time signal comprises a sum of a first and second space vector time signals indicative of a respective time interval when the first and second space vectors are activated.24. The current controller of claim 19, further comprising a filter for filtering the received state vector time signal.25. The current controller of claim 19, further comprising a commanded direct axis current control loop having a state vector time signal as a feedback signal.26. The current controller of claim 19, wherein the state vector error comparator is a subtractor for subtracting the received state vector time signal from the commanded state vector time signal.27. The current controller of claim 19, wherein the state vector error comparator is a subtractor for subtracting the commanded state vector time signal from the received state vector time signal.28. The current controller of claim 19, wherein the controller further comprises:a proportional-integral state vector error signal regulator for generating a proportional-integral state vector error signal comprising proportional and integral components; a limiter, coupled to the proportional-integral state vector error signal regulator, for limiting the proportional-integral state vector error signal and providing a limited proportional-integral state vector error signal; and a summer, coupled to the limiter, for generating a direct axis current signal responsive to the limited proportional-integral state vector error signal and the commanded direct axis current signal. 29. The current controller of claim 28, wherein the limiter limits the output of the proportional-integral state vector error signal regulator to a value of less than zero or equal to zero.30. The current controller of claim 19, wherein the controller further comprises:a proportional-integral state vector error signal regulator for generating a proportional-integral state vector error signal comprising proportional and integral components; and a limiter, coupled to the proportional-integral state vector error signal regulator, for limiting the proportional-integral state vector error signal and providing a direct axis current signal responsive to the limited proportional-integral state vector error signal and the commanded direct axis current signal. 31. The current controller of claim 30, wherein the limiter limits the output of the proportional-integral state vector error signal regulator to a value of less than or equal to the commanded direct axis current signal.32. A current controller for an electric machine comprising:a state vector error comparator for comparing a received state vector time signal to a commanded state vector time signal and generating a state vector time error signal; a control element, coupled to the state vector error comparator, for providing a direct axis current signal, responsive to the state vector time error, to a machine controller; a proportional-integral state vector error signal regulator, coupled to the state vector error comparator, for generating a proportional-integral state vector time error signal comprising proportional and integral components; a zero comparator, coupled to the proportional-integral state vector error signal regulator, to determine when the proportional-integral state vector time error signal has a negative value; a summer, for adding the proportional-integral state vector time error signal and the commanded direct axis current signal to generate a direct axis current signal; and a switch, coupled to the zero comparator, for applying the direct axis current signal to a direct axis current input of the machine controller when the proportional-integral state vector time error signal has a negative value. 33. A current controller for an electric machine comprising:a state vector error comparator for comparing a received state vector time signal to a commanded state vector time signal and generating a state vector time error signal: a control element, coupled to the state vector error comparator, for providing a direct axis current signal, responsive to the state vector time error, to a machine controller; a proportional-integral state vector error signal regulator, coupled to the state vector error comparator, for generating a proportional-integral state vector time error signal comprising proportional and integral components; a zero comparator, coupled to the proportional-integral state vector error comparator, to determine when the proportional-integral state vector time error signal has a positive value; and a switch, coupled to the zero comparator, for applying a commanded direct axis current signal to the direct axis current input of the machine controller when the proportional-integral state vector time error signal has a positive value or a zero value.