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A position sensor emulator system and method for use in the control of synchronous machines are disclosed. The position sensor emulator system ( 220 ) includes a first bandpass filter ( 222 ) that filters phase voltage signals from a stator of a synchronous machine ( 230 ). A converter ( 224 ) that

A position sensor emulator system and method for use in the control of synchronous machines are disclosed. The position sensor emulator system ( 220 ) includes a first bandpass filter ( 222 ) that filters phase voltage signals from a stator of a synchronous machine ( 230 ). A converter ( 224 ) that converts the filtered phase voltages into balanced two-phase quadrature signals. A rectifier ( 226 ) that rectifies exciter voltage signals of the synchronous machine ( 230 ) and a second bandpass filter ( 228 ) that filters the rectified exciter voltage signals to generate a reference signal.

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1. A position sensor emulator comprising:a first bandpass filter that filters phase voltage signals from a stator of a synchronous machine, wherein said synchronous machine is used simultaneously as a motor and as a position sensor;a converter that converts the filtered phase voltages into balanced

1. A position sensor emulator comprising:a first bandpass filter that filters phase voltage signals from a stator of a synchronous machine, wherein said synchronous machine is used simultaneously as a motor and as a position sensor;a converter that converts the filtered phase voltages into balanced two-phase quadrature signals;a rectifier that rectifies exciter voltage signals of the synchronous machine; anda second bandpass filter that filters the rectified exciter voltage signals to generate a reference signal. 2. The position sensor emulator of claim 1, wherein the first and second bandpass filters have the same passband. 3. The position sensor emulator of claim 1, wherein the first and second bandpass filters have a fixed passband. 4. The position sensor emulator of claim 3, wherein the fixed passband is defined as: f =2 ·N ph ·f ex ±ω et wherein f is the passband, N ph is a number of phases in an exciter stator, f ex is the frequency of the exciter voltage, and ω et is the top electrical angular speed of the stator of the synchronous machine. 5. The position sensor emulator of claim 1, wherein the first bandpass filter has a center frequency that tracks a frequency component containing position information. 6. The position sensor emulator of claim 1, wherein the two-phase quadrature signals are used as inputs to emulate a position sensor in a drive system for the synchronous machine. 7. The position sensor emulator of claim 1, wherein the two-phase quadrature signals and the reference signal are used as inputs to emulate a resolver in a drive system for the synchronous machine. 8. The position sensor emulator of claim 1, wherein a Clarke transformation is used to convert the filtered phase voltages into the balanced two-phase quadrature signals. 9. The position sensor emulator of claim 1, wherein the synchronous machine is used as a position sensor while operating at zero speed. 10. The position sensor emulator of claim 1, wherein the synchronous machine does not use a counter electromotive force (EMF) in order to be used as a position sensor. 11. The position sensor emulator of claim 1, wherein the synchronous machine is used as a position sensor based on similarities between a resolver and a main rotor, the main rotor being part of the synchronous machine. 12. The position sensor emulator of claim 1, wherein the filtered phase voltage signals from the stator are driven by exciter voltage signals. 13. A position sensor emulator comprising:a first bandpass filter that filters phase voltage signals from a stator of a synchronous machine, wherein said synchronous machine is used simultaneously as a motor and as a position sensor; anda converter that converts the filtered phase voltages into balanced two-phase quadrature signals,wherein the first bandpass filter has a center frequency that tracks a frequency component containing position information,wherein the center frequency is defined as: f c =2 ·N ph ·f ex +ω e wherein f is the passband, N ph is a number of phases in an exciter stator, f ex is the frequency of the exciter voltage, and ω e is an electrical angular speed of the stator of the synchronous machine. 14. A position sensor emulator comprising:a first bandpass filter that filters phase voltage signals from a stator of a synchronous machine, wherein said synchronous machine is used simultaneously as a motor and as a position sensor; anda converter that converts the filtered phase voltages into balanced two-phase quadrature signals,wherein the first bandpass filter has a center frequency that tracks a frequency component containing position information,wherein the center frequency is defined as: f c =2 ·N ph ·f ex −ω e wherein f is the passband, N ph is a number of phases in an exciter stator, f ex is the frequency of the exciter voltage, and ω e is an electrical angular speed of the stator of the synchronous machine. 15. A position sensor emulator comprising:a first bandpass filter that filters phase voltage signals from a stator of a synchronous machine, wherein said synchronous machine is used simultaneously as a motor and as a position sensor;a converter that converts the filtered phase voltages into balanced two-phase quadrature signals; anda switch for switching position feedback from the position sensor emulator during a zero and low speed condition, wherein the low speed condition is to approximately 10%-25% of top speed of the synchronous machine, to a high speed control scheme that does not use the position sensor emulator. 16. A method for emulating a position sensor comprises:bandpass filtering phase voltage signals from a stator of a synchronous machine, wherein said synchronous machine is used simultaneously as a motor and as a position sensor;converting the filtered phase voltages into balanced two-phase quadrature signals;rectifying exciter voltage signals of the synchronous machine; andbandpass filtering the rectified exciter voltage signals to generate a reference signal. 17. The method of claim 16, wherein the bandpass filtering of the phase voltage signals and of the rectified exciter voltage signals has the same passband. 18. The method of claim 16, wherein the bandpass filtering of the phase voltage signals and of the rectified exciter voltage signals has a fixed passband. 19. The method of claim 18, wherein the fixed passband is defined as: f =2 ·N ph ·f ex ±ω et wherein f is the passband, N ph is a number of phases in an exciter stator, f ex is the frequency of the exciter voltage, and ω et is the top electrical angular speed of the stator of the synchronous machine. 20. The method of claim 16, wherein the bandpass filtering of the phase voltage signals and of the rectified exciter voltage signals has a center frequency that tracks a frequency component containing position information. 21. The method of claim 20, wherein the center frequency is defined as: f c =2 ·N ph ·f ex +ω e wherein f is the passband, N ph is a number of phases in an exciter stator, f ex is the frequency of the exciter voltage, and ω e is an electrical angular speed of the stator of the synchronous machine. 22. The method of claim 20, wherein the center frequency is defined as; f c =2 ·N ph ·f ex −ω e wherein f is the passband, N ph is a number of phases in an exciter stator, f ex is the frequency of the exciter voltage, and ω e is an electrical angular speed of the stator of the synchronous machine. 23. The method of claim 16, wherein the two-phase quadrature signals are used as inputs to emulate a position sensor in a drive system for the synchronous machine. 24. The method of claim 16, wherein the two-phase quadrature signals and the reference signal are used as inputs to emulate a resolver in a drive system for the synchronous machine. 25. The method of claim 16, wherein a Clarke transformation is used to convert the filtered phase voltages into the balanced two-phase quadrature signals. 26. A method for emulating a position sensor comprising:bandpass filtering phase voltage signals from a stator of a synchronous machine, wherein said synchronous machine is used simultaneously as a motor and as a position sensor;converting the filtered phase voltages into balanced two-phase quadrature signals; andswitching position feedback from the position sensor emulation during a zero and low speed condition, wherein the low speed condition is to approximately 10%-25% of top speed of the synchronous machine, to a high speed control scheme that does not use the position sensor emulator. 27. The position sensor emulator of claim 12, wherein the phase voltage signals are continuously detected.