Brake system for a compressor

A heating, ventilation, and/or air conditioning (HVAC) system, comprising:

• a compressor comprising an impeller configured to rotate and direct a flow of working fluid through a working fluid circuit of the HVAC system;
• a motor configured to drive the impeller to rotate;
• a controller communicatively coupled to the motor, wherein the controller is configured to:
• manage supply of power to the motor to drive the impeller to rotate in an active operating mode of the HVAC system;
• receive an indication to operate the HVAC system in an inactive operating mode;
• interrupt the supply of power to the motor in response to receipt of the indication to operate the HVAC system in the inactive operating mode;
• adjust pre-rotation vanes and/or a variable geometry diffuser of the compressor to enable a backflow of the working fluid through the impeller for a first interval of time, wherein the backflow of the working fluid comprises flow of the working fluid from a condenser disposed along the working fluid circuit, through the impeller, and toward an evaporator disposed along the working fluid circuit in response to receipt of the indication to operate the HVAC system in the inactive operating mode;
• and
• adjust the pre-rotation vanes and/or the variable geometry diffuser to block the backflow of the working fluid through the impeller for a second interval of time after the first interval of time.

A tangible, non-transitory, computer-readable medium comprising executable instructions that, when executed by a processor in response to receiving an input indicative of a transition of a heating, ventilation, and/or air conditioning (HVAC) system to operate in an inactive operating mode, are configured to cause the processor to:

• suspend operation of a compressor of the HVAC system in order to operate the HVAC system in the inactive operating mode, wherein the compressor comprises an impeller configured to rotate and thus drive a working fluid through a working fluid circuit of the HVAC system;
• receive feedback from a sensor indicative of an operating parameter of the compressor;
• and
• adjust a position of a fluid flow adjustment feature of the compressor to enable a flow of the working fluid in a backflow direction from a condenser of the HVAC system, through the compressor, and toward an evaporator of the HVAC system for an interval of time based on the feedback received from the sensor in the inactive operating mode of the HVAC system.