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Detection of reverse rotation or operation of a refrigerant compressor is provided. In one aspect, a detection technique includes starting the compressor and determining the compressor is rotating in a reverse direction if a dome temperature of the compressor fails to exceed a first predetermined th

Detection of reverse rotation or operation of a refrigerant compressor is provided. In one aspect, a detection technique includes starting the compressor and determining the compressor is rotating in a reverse direction if a dome temperature of the compressor fails to exceed a first predetermined threshold at or before expiration of a first predetermined period of time following starting, the refrigerant pressure at a refrigerant inlet of the compressor remains constant for a second predetermined period of time following starting, and/or the frequency of pressure oscillations of the refrigerant at the refrigerant inlet exceeds a second predetermined threshold. Another technique for determining the compressor is rotating in the reverse direction involves analyzing a waveform associated with motor current, motor torque, or refrigerant pressure. Further embodiments, forms, features, and aspects shall become apparent from the description and drawings.

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1. A method for operating a compressor in a refrigerant loop, comprising: starting the compressor;analyzing one or more of a motor current waveform, a motor torque waveform, and a waveform of refrigerant pressure at a refrigerant outlet of the compressor; anddetermining the compressor is rotating in

1. A method for operating a compressor in a refrigerant loop, comprising: starting the compressor;analyzing one or more of a motor current waveform, a motor torque waveform, and a waveform of refrigerant pressure at a refrigerant outlet of the compressor; anddetermining the compressor is rotating in a reverse direction in response to at least one of:determining the presence of a high frequency harmonic exceeding a first predetermined threshold on at least one of the one or more analyzed waveforms, andperforming a fast Fourier transform (FFT) over a predetermined frequency band and determining the summation of the FFT amplitude within the predetermined frequency band on at least one of the one or more analyzed waveforms exceeds a second predetermined threshold; andstopping the compressor in response to determining the compressor is rotating in the reverse direction. 2. The method of claim 1, wherein the motor current waveform is related to q-axis current. 3. The method of claim 1, wherein the first predetermined threshold corresponds to the second predetermined threshold. 4. The method of claim 1, wherein the compressor is a scroll compressor. 5. The method of claim 1 wherein the frequency band is selected to differentiate normal operation and reverse operation for a plurality of different compressors. 6. The method of claim 5 wherein the frequency band encompasses different high frequency harmonics for the respective different compressors. 7. A system, comprising: a refrigerant compressor including a dome and a refrigerant outlet; anda controller configured to analyze one or more of a motor current waveform, a motor torque waveform, and a waveform of refrigerant pressure at the refrigerant outlet, and to determine the compressor is rotating in a reverse direction in response to at least one of:determining the presence of a high frequency harmonic exceeding a first predetermined threshold on at least one of the one or more analyzed waveforms, andperforming a fast Fourier transform (FFT) over a predetermined frequency band and determining the summation of FFT amplitude within the predetermined frequency band on at least one of the one or more analyzed waveforms exceeds a second predetermined threshold;wherein the controller is further configured to stop operation of the compressor in response to determining the compressor is rotating in the reverse direction. 8. The system of claim 7, wherein the compressor is a scroll compressor. 9. The system of claim 7, wherein the motor current waveform is related to q-axis current. 10. The system of claim 7, wherein the first predetermined threshold corresponds to the second predetermined threshold. 11. The system of claim 7, further comprising a variable frequency drive, an electric motor operatively coupled with the compressor, a refrigeration loop, a condenser, and an evaporator. 12. The system of claim 7 wherein the frequency band is adapted to differentiate normal operation and reverse operation for a plurality of different compressors. 13. The method of claim 12 wherein the frequency band covers different high frequency harmonics for the respective different compressors. 14. A method for operating a compressor in a refrigerant loop, comprising: starting the compressor;analyzing one or more of a motor current waveform, a motor torque waveform, and a waveform of refrigerant pressure at a refrigerant outlet of the compressor; anddetermining in connection with the analyzing that the compressor is rotating in a reverse direction in response to the presence of a high frequency harmonic exceeding a first predetermined threshold on at least one of the one or more analyzed waveforms; andcontrolling operation of the compressor in response to determining the compressor is rotating in the reverse direction. 15. The method of claim 14 wherein the act of controlling operation of the compressor in response to determining the compressor is rotating in the reverse direction comprises stopping the compressor. 16. The method of claim 14, wherein the motor current waveform is related to q-axis current. 17. The method of claim 14, wherein the analyzing includes performing a fast Fourier transform (FFT) analysis on at least one of the waveforms. 18. The method of claim 14, wherein the first predetermined threshold corresponds to a second predetermined threshold. 19. The method of claim 14, wherein the compressor is a scroll compressor. 20. A system, comprising: a refrigerant compressor including a dome and a refrigerant outlet; and a controller configured to analyze one or more of a motor current waveform, a motor torque waveform, and a waveform of refrigerant pressure at the refrigerant outlet, perform a fast Fourier transform (FFT) on a predetermined frequency range, evaluate whether a summation of the FFT amplitude in the predetermined frequency range exceeds a predetermined threshold, determine that the compressor is rotating in a reverse direction in response to a determination that the summation of amplitude within a frequency band on at least one of the one or more analyzed waveforms exceeds the predetermined threshold, and control operation of the compressor in response to determining the compressor is rotating in the reverse direction. 21. The system of claim 20, wherein the wherein the controller is configured to stop the compressor in response to determining the compressor is rotating in the reverse direction. 22. The system of claim 20, wherein the compressor is a scroll compressor. 23. The system of claim 20, wherein the motor current waveform is related to q-axis current. 24. The system of claim 20, further comprising a variable frequency drive, an electric motor operatively coupled with the compressor, a refrigeration loop, a condenser, and an evaporator. 25. The system of claim 20 wherein the frequency range is configured to differentiate normal operation and reverse operation for a plurality of different compressors. 26. The method of claim 25 wherein the frequency range covers different high frequency harmonics for the respective different compressors.