US20100028182A1 - Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports - Google Patents

Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports Download PDF

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Publication number
US20100028182A1
US20100028182A1 US12/183,149 US18314908A US2010028182A1 US 20100028182 A1 US20100028182 A1 US 20100028182A1 US 18314908 A US18314908 A US 18314908A US 2010028182 A1 US2010028182 A1 US 2010028182A1
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US
United States
Prior art keywords
scroll compressor
scroll
permanent magnet
magnet synchronous
scroll member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/183,149
Inventor
Gregory W. Hahn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danfoss Scroll Technologies LLC
Original Assignee
Danfoss Scroll Technologies LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Danfoss Scroll Technologies LLC filed Critical Danfoss Scroll Technologies LLC
Priority to US12/183,149 priority Critical patent/US20100028182A1/en
Assigned to SCROLL TECHNOLOGIES reassignment SCROLL TECHNOLOGIES ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAHN, GREGORY W.
Assigned to DANFOSS SCROLL TECHNOLOGIES, LLC reassignment DANFOSS SCROLL TECHNOLOGIES, LLC CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SCROLL TECHNOLOGIES, LLC
Publication of US20100028182A1 publication Critical patent/US20100028182A1/en
Application status is Abandoned legal-status Critical

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/0042Driving elements, brakes, couplings, transmissions specially adapted for pumps
    • F04C29/0085Prime movers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/005Axial sealings for working fluid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/24Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C28/26Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels

Abstract

A scroll compressor is provided with some capacity reduction technique such as a bypass port. The electric motor for driving the scroll compressor is not an induction motor, but rather a line fed permanent magnet synchronous motor is utilized. Such motors have a higher overall efficiency, and thus will be more efficient at reduced capacity operation.

Description

    BACKGROUND OF THE INVENTION
  • This application relates to a scroll compressor having a line fed permanent magnet synchronous type motor, which has a relatively constant power curve as a load changes, and wherein the scroll compressor is provided with a function to reduce capacity.
  • Scroll compressors are becoming widely utilized in refrigerant compression applications. In a scroll compressor, a pair of scroll elements each have a base and a generally spiral wrap extending from the base. The wraps interfit to define compression chambers. An electric motor drives a shaft, and the shaft drives one of the two scroll members to rotate relative to the other through a non-rotation coupling.
  • There are many enhancements to the basic scroll compressor design. In one enhancement, partially or fully compressed refrigerant may be tapped back to a suction pressure to reduce the load on the compressor motor when there is a reduced capacity needed for a refrigerant system associated with the compressor. This is known as bypass or unloaded operation.
  • Other ways of reducing the capacity of the compressor, such as pulse width modulation to a back pressure chamber are also known. With all of these functions, the torque on the compressor motor is reduced.
  • In all known scroll compressor designs, an induction motor has been utilized. An induction motor has a peak efficiency at a certain load torque, above as well as below which the efficiency decreases. The value of reducing the capacity, which is to save energy, is somewhat lost due to the reduced efficiency.
  • SUMMARY OF THE INVENTION
  • In the disclosed embodiment of this invention, a scroll compressor having some way of reducing capacity is provided with a line fed permanent magnet synchronous type motor. The permanent magnet motor has a higher peak efficiency, and a flatter efficiency versus torque curve compared to the prior art induction motor.
  • These and other features of the present invention can be best understood from the following specification and drawings, the following of which is a brief description.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a scroll compressor incorporating the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
  • A scroll compressor 20 is illustrated in FIG. 1. As shown, a motor stator 22 causes a motor rotor 23 to rotate. When rotor 23 rotates, a shaft 24 is driven to rotate. Shaft 24 causes an orbiting scroll 26 to orbit relative to a non-orbiting scroll 28, as known. The components as described at this point are housed within a shell 30. A suction port 32 receives a suction refrigerant from a refrigerant cycle, and delivers that refrigerant to compression chambers between the orbiting scroll 26 and non-orbiting scroll 28. A discharge tube 34 delivers a compressed refrigerant downstream into the refrigerant cycle.
  • Bypass ports 36 communicate with the compression chambers, and may return a partially or fully compressed refrigerant to the suction pressure, such as suction tube 32. As shown, a bypass line 38 incorporates a valve 40 to selectively communicate this refrigerant back to the suction port. However, any other way of communicating partially or fully compressed refrigerant back to the suction pressure may be utilized with this invention. Moreover, other ways of modulating the capacity of the compressor would come within the scope of this invention. As an example, scroll compressors are known wherein a biasing force is provided behind one of the two scroll compressors. Pulse width modulation techniques may be utilized to lower that biasing force under certain conditions such that the scroll members can come away from each other and reduce the capacity.
  • As shown in FIG. 1, the scroll compressor includes a tap 100 extending through the orbiting scroll member 26 into a back pressure chamber 102. As known, this creates a biasing force holding the orbiting scroll member 26 in contact with the non-orbiting scroll member 28. In addition, the drive between the shaft 24 and the scroll compressor 26 is through a slider block arrangement 110. Such arrangements allow for radial movement of the orbiting scroll 26. Both the axial compliance and the radial compliance allow the reduction of capacity by allowing the wraps of the scroll members to move out of contact with each other. Techniques for providing this reduction in capacity are known. It is the use of a particular motor with such an ability to reduce capacity which is inventive here.
  • Any other capacity modulation technique would come within the scope of this invention.
  • This invention relates to the use of a permanent magnet synchronous motor for any scroll compressor having the ability to reduce its capacity. Such motors have a high peak efficiency, and a flatter efficiency versus torque curve. Thus, when the capacity is reduced, the motor 22/23 will still operate more efficiently than the prior art which utilize an induction motor.
  • While an embodiment of this invention has been disclosed, a worker of ordinary skill in this art would recognize that certain modifications would come within the scope of this invention. For that reason, the following claims should be studied to determine the true scope and content of this invention.

Claims (5)

1. A scroll compressor comprising:
a first scroll member having a base and a generally spiral wrap extending from said base;
a second scroll member having a base and a generally spiral wrap extending from its base, said generally spiral wraps interfitting to define compression chambers; and
an electric motor operable to drive a rotary shaft to in turn cause said second scroll member to orbit relative to said first scroll member, said electric motor being a permanent magnet synchronous motor, wherein said permanent magnet synchronous motor is a line fed motor, running directly from the mains without requirement of frequency inverter.
2. Scroll compressor as set forth in claim 1, wherein a capacity reduction feature being incorporated into the scroll compressor to allow the reduction of capacity provided by the scroll compressor under certain conditions.
3. The scroll compressor as set forth in claim 1, wherein bypass ports are provided to reduce the capacity of the scroll compressor.
4. The scroll compressor as set forth in claim 1, wherein said second scroll member and said first scroll member are held together, but are movable away from each other in an axial direction.
5. The scroll compressor as set forth in claim 1, wherein the wraps of said first and second scroll member are held together but are capable of moving radially away from each other.
US12/183,149 2008-07-31 2008-07-31 Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports Abandoned US20100028182A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/183,149 US20100028182A1 (en) 2008-07-31 2008-07-31 Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US12/183,149 US20100028182A1 (en) 2008-07-31 2008-07-31 Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports
KR1020090042618A KR20100014104A (en) 2008-07-31 2009-05-15 Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports
EP09251430A EP2149708A3 (en) 2008-07-31 2009-05-28 Scroll compressor with bypass ports driven by a line fed permanent magnet sychronous type motor.
CN 200910147498 CN101639066A (en) 2008-07-31 2009-06-16 Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports
JP2009164611A JP2010038154A (en) 2008-07-31 2009-07-13 Line fed permanent magnet synchronous type motor used for scroll compressor with bypass port

Publications (1)

Publication Number Publication Date
US20100028182A1 true US20100028182A1 (en) 2010-02-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US12/183,149 Abandoned US20100028182A1 (en) 2008-07-31 2008-07-31 Line fed permanent magnet synchronous type motor for scroll compressor with bypass ports

Country Status (5)

Country Link
US (1) US20100028182A1 (en)
EP (1) EP2149708A3 (en)
JP (1) JP2010038154A (en)
KR (1) KR20100014104A (en)
CN (1) CN101639066A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120201707A1 (en) * 2011-02-04 2012-08-09 Zlll Sun Scroll compressor with three discharge valves, and discharge pressure tap to back pressure chamber
US20170241417A1 (en) * 2016-02-24 2017-08-24 Lg Electronics Inc. Scroll compressor
US10316843B2 (en) 2016-05-30 2019-06-11 Lg Electronics Inc. Scroll compressor that includes a non-orbiting scroll having a bypass hole
US10428819B2 (en) 2016-05-25 2019-10-01 Lg Electronics Inc. Scroll compressor that includes a non-orbiting scroll having a bypass hole

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102444580B (en) * 2010-09-30 2016-03-23 艾默生电气公司 With the digital compressor of across-the-line starting brushless permanent magnet electromotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6863510B2 (en) * 2002-05-01 2005-03-08 Lg Electronics Inc. Vacuum preventing oil seal for scroll compressor
US20060140792A1 (en) * 2004-12-27 2006-06-29 Hitachi Air Conditioning Systems Co., Ltd. Displacement type compressor
US7071650B2 (en) * 2003-07-09 2006-07-04 Matsushita Electric Industrial Co., Ltd. Synchronous induction motor and electric hermetic compressor using the same
US20070122302A1 (en) * 2005-11-30 2007-05-31 Scroll Technologies Ductile cast iron scroll compressor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100371171B1 (en) * 2000-06-30 2003-02-05 엘지전자 주식회사 Radial adaptation structure for scroll compressor
KR100557057B1 (en) * 2003-07-26 2006-03-03 엘지전자 주식회사 Scroll compressor with volume regulating capability
JP2005117771A (en) * 2003-10-07 2005-04-28 Hitachi Ltd Permanent magnet type synchronous motor and compressor using it
US7140851B2 (en) * 2004-09-07 2006-11-28 Chyn Tec. International Co., Ltd. Axial compliance mechanism of scroll compressor
JP2007181305A (en) * 2005-12-28 2007-07-12 Hitachi Ltd Permanent magnet type synchronous motor and compressor using the same
JP5016852B2 (en) * 2006-06-09 2012-09-05 日立アプライアンス株式会社 Permanent magnet motor, permanent magnet synchronous motor rotor and compressor using the same
US7772736B2 (en) * 2006-06-09 2010-08-10 Hitachi Appliances, Inc. Permanent magnet synchronous motor, rotor of the same, and compressor using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6863510B2 (en) * 2002-05-01 2005-03-08 Lg Electronics Inc. Vacuum preventing oil seal for scroll compressor
US7071650B2 (en) * 2003-07-09 2006-07-04 Matsushita Electric Industrial Co., Ltd. Synchronous induction motor and electric hermetic compressor using the same
US20060140792A1 (en) * 2004-12-27 2006-06-29 Hitachi Air Conditioning Systems Co., Ltd. Displacement type compressor
US20070122302A1 (en) * 2005-11-30 2007-05-31 Scroll Technologies Ductile cast iron scroll compressor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120201707A1 (en) * 2011-02-04 2012-08-09 Zlll Sun Scroll compressor with three discharge valves, and discharge pressure tap to back pressure chamber
US8579614B2 (en) * 2011-02-04 2013-11-12 Danfoss Scroll Technologies Llc Scroll compressor with three discharge valves, and discharge pressure tap to back pressure chamber
US20170241417A1 (en) * 2016-02-24 2017-08-24 Lg Electronics Inc. Scroll compressor
US10428818B2 (en) * 2016-02-24 2019-10-01 Lg Electronics Inc. Scroll compressor
US10428819B2 (en) 2016-05-25 2019-10-01 Lg Electronics Inc. Scroll compressor that includes a non-orbiting scroll having a bypass hole
US10316843B2 (en) 2016-05-30 2019-06-11 Lg Electronics Inc. Scroll compressor that includes a non-orbiting scroll having a bypass hole

Also Published As

Publication number Publication date
JP2010038154A (en) 2010-02-18
CN101639066A (en) 2010-02-03
EP2149708A2 (en) 2010-02-03
EP2149708A3 (en) 2011-06-29
KR20100014104A (en) 2010-02-10

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AS Assignment

Owner name: SCROLL TECHNOLOGIES,ARKANSAS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HAHN, GREGORY W.;REEL/FRAME:021321/0172

Effective date: 20080730

AS Assignment

Owner name: DANFOSS SCROLL TECHNOLOGIES, LLC,ARKANSAS

Free format text: CHANGE OF NAME;ASSIGNOR:SCROLL TECHNOLOGIES, LLC;REEL/FRAME:022664/0098

Effective date: 20080815

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION