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公开(公告)号：US11722025B2
公开(公告)日：2023-08-08
申请号：US17139253
申请日：2020-12-31
发明人： Fredrik Boxberg , Charles J. Peterson , Yubo Nian , Petri J. Mäki-Ontto , Lauri Juhani Salmia , Russell T. Abbott , Tomas Fajt , Seth M. McGill
CPC分类号： H02K1/278 , H02K11/012 , H02K15/03
摘要： Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.
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公开(公告)号：US10826357B2
公开(公告)日：2020-11-03
申请号：US15635658
申请日：2017-06-28
IPC分类号： H02K11/01 , H02K9/20 , H02K1/27 , H02K1/28 , F25B31/00 , H02K21/16 , H02K1/22 , H02K16/02 , H02K9/22
摘要： Disclosed are an electric motor and a simplified variable speed drive system which renders the use of filtering components in a motor drive circuit unnecessary and increases torque transfer from permanent magnets of the rotor to the output shaft. The motor includes a fluid gap between the rotor and the stator configured to receive a cooling fluid, such a refrigerant. A plurality of radially-abutting, bread loaf-shaped magnets having a flat base are respectively fixed to a plurality of longitudinally oriented mounting facets provided on the shaft to provide maximum torque transfer from the magnets to the shaft. An eddy shield disposed between the faceted shaft and the magnets thermally shunts high frequency harmonics from the magnets to the shaft and cooling fluid. The rotor components are mechanically secured by a sleeve disposed around the rotor.
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公开(公告)号：US11913463B2
公开(公告)日：2024-02-27
申请号：US17314534
申请日：2021-05-07
IPC分类号： F04D27/00 , F04D25/06 , F04D29/057
CPC分类号： F04D27/004 , F04D25/06 , F04D25/068 , F04D27/00 , F04D27/007 , F04D29/057 , F04C2240/54
摘要： A compressor for a heat transfer circuit includes a variable frequency drive (VFD), an electric motor that rotates a driveshaft, bearing(s) for supporting the driveshaft, a backup gas supply, and a power supply. During a utility power interruption, the backup gas supply operates utilizing DC electrical power generated by a back electromotive force of the electric motor. A method of operating an electric power supply system for a compressor includes operating in a utility power mode and operating in a backup power mode during a utility power interruption. In the utility power mode, AC electrical power is supplied from the VFD to the motor. In the backup power mode, DC electrical power generated in the VFD by a back electromotive force of the motor it used to operate a backup gas supply to supply compressed working fluid to gas bearing(s) of the compressor.
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公开(公告)号：US20210273525A1
公开(公告)日：2021-09-02
申请号：US17320989
申请日：2021-05-14
摘要： Disclosed is a hermetic AC electric motor that includes harmonics shunting such that high frequency harmonics are shunted from the AC electric motor without the use of one or more high frequency filters in the associated motor drive. A related method of operating an AC electric motor includes shunting high frequency harmonics to a fluid passing through the AC electric motor. Also disclosed is a simplified variable speed motor drive system which eliminates the need for a filter for removing high frequency harmonics.
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公开(公告)号：US20240030763A1
公开(公告)日：2024-01-25
申请号：US18366344
申请日：2023-08-07
发明人： Fredrik Boxberg , Charles J. Peterson , Yubo Nian , Petri J. Mäki-Ontto , Lauri Juhani Salmia , Russell T. Abbott , Tomas Fajt , Seth M. McGill
CPC分类号： H02K1/278 , H02K11/012 , H02K15/03
摘要： Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.
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公开(公告)号：US20220209598A1
公开(公告)日：2022-06-30
申请号：US17139253
申请日：2020-12-31
发明人： Fredrik Boxberg , Charles J. Peterson , Yubo Nian , Petri J. Mäki-Ontto , Lauri Juhani Salmia , Russell T. Abbott , Tomas Fajt , Seth M. McGill
摘要： Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.
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公开(公告)号：US20170373564A1
公开(公告)日：2017-12-28
申请号：US15635637
申请日：2017-06-28
IPC分类号： H02K11/028 , F25B31/00 , H02K1/27 , H02K9/20
CPC分类号： H02K11/028 , F25B31/006 , H02K1/278 , H02K1/28 , H02K1/30 , H02K3/16 , H02K9/12 , H02K9/20
摘要： Disclosed is a hermetic AC electric motor that includes harmonics shunting such that high frequency harmonics are shunted from the AC electric motor without the use of one or more high frequency filters in the associated motor drive. A related method of operating an AC electric motor includes shunting high frequency harmonics to a fluid passing through the AC electric motor. Also disclosed is a simplified variable speed motor drive system which eliminates the need for a filter for removing high frequency harmonics.
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公开(公告)号：US11916444B2
公开(公告)日：2024-02-27
申请号：US17320989
申请日：2021-05-14
CPC分类号： H02K11/028 , F25B31/006 , H02K1/278 , H02K3/16 , H02K9/12 , H02K9/20
摘要： Disclosed is a hermetic AC electric motor that includes harmonics shunting such that high frequency harmonics are shunted from the AC electric motor without the use of one or more high frequency filters in the associated motor drive. A related method of operating an AC electric motor includes shunting high frequency harmonics to a fluid passing through the AC electric motor. Also disclosed is a simplified variable speed motor drive system which eliminates the need for a filter for removing high frequency harmonics.
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公开(公告)号：US20220357087A1
公开(公告)日：2022-11-10
申请号：US17314534
申请日：2021-05-07
IPC分类号： F25B49/02
摘要： A compressor for a heat transfer circuit includes a variable frequency drive (VFD), an electric motor that rotates a driveshaft, bearing(s) for supporting the driveshaft, a backup gas supply, and a power supply. During a utility power interruption, the backup gas supply operates utilizing DC electrical power generated by a back electromotive force of the electric motor. A method of operating an electric power supply system for a compressor includes operating in a utility power mode and operating in a backup power mode during a utility power interruption. In the utility power mode, AC electrical power is supplied from the VFD to the motor. In the backup power mode, DC electrical power generated in the VFD by a back electromotive force of the motor it used to operate a backup gas supply to supply compressed working fluid to gas bearing(s) of the compressor.
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公开(公告)号：US20220316747A1
公开(公告)日：2022-10-06
申请号：US17218546
申请日：2021-03-31
IPC分类号： F24F11/86
摘要： A method for adjusting compression efficiency for an HVACR system having a variable-frequency drive (VFD) is disclosed. The method includes determining a first compression efficiency, determining an operating point, determining a region of an operating map when a difference between the operating point and a previously determined operating point exceeds a predetermined threshold, adjusting a VFD input to a first input based on the region of the operating map, and controlling the VFD using the first input for a predetermined period of time. The method also includes determining a second compression efficiency and an operation restriction, adjusting the VFD input to a second input based on the operation restriction and a difference between the first compression efficiency and the second compression efficiency, and controlling the VFD using the second input. The method also includes utilizing machine learning control techniques to control several system variables to optimize the compression efficiency.
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