公开(公告)号：US20170227273A1

公开(公告)日：2017-08-10

申请号：US15495269

申请日：2017-04-24

Applicant: TRANE INTERNATIONAL INC.

Inventor： NATHAN THOMAS WEST ,  Benjamin James Sykora ,  David Marshall Foye ,  Dennis Myron Beekman ,  Korwin Jay Anderson ,  Robert Bakkestuen

IPC: F25B49/02 ,  F04C29/00 ,  F04C28/04 ,  F04C28/08 ,  F04C18/02 ,  F04C18/16

Abstract: Unique apparatuses, methods, and systems of opposing, limiting, and/or preventing undesired or un-commanded compressor rotation are disclosed. One exemplary embodiment is an HVACR system comprising a variable frequency drive configured to drive an electric motor to rotate a screw compressor or scroll compressor. A controller is configured to monitor various aspects of the system and to control the drive. When a condition indicative of potential undesired or un-commanded compressor rotation is identified, the controller commands the variable frequency drive to control the motor to limit and preferably prevent compressor rotation. One technique comprises shorting switches of the drive to a DC bus rail to allow back EMF induced current in the motor windings to be dissipated through winding resistance thus providing a damping force. Another technique comprises controlling the inverter to insert a DC current into the motor to cause the motor to align to and hold a particular position.

公开(公告)号：US20170167769A1

公开(公告)日：2017-06-15

申请号：US15443287

申请日：2017-02-27

Applicant: TRANE INTERNATIONAL INC.

Inventor： NATHAN THOMAS WEST ,  Dennis Myron Beekman ,  David Marshall Foye ,  Korwin Jay Anderson ,  Benjamin James Sykora

IPC: F25B49/02 ,  F04C28/08 ,  F04C18/02 ,  F04C28/06

CPC classification number: F25B49/022 ,  F04B49/065 ,  F04B49/20 ,  F04C18/0215 ,  F04C28/06 ,  F04C28/08 ,  F04D27/0261 ,  F25B1/04 ,  F25B2600/021 ,  F25B2700/1931 ,  F25B2700/1933 ,  F25B2700/21151 ,  F25B2700/21152 ,  Y02B30/741

Abstract: Systems and methods are used to control operation of a rotary compressor of a refrigeration system to limit or prevent movement of rotors due to axial thrust loading resulting from rapid changes in speed of the rotors of the compressor. The operational profile of the motor is controlled to maintain acceleration torque and deceleration torque within predefined limits. The acceleration torque and deceleration torque are maintained within the predefined limits by controlling the speed of the motor, or by controlling the torque applied by the motor to the rotors during acceleration or deceleration.