WO2020057822A1 - A hermetic compressor weight balancing rotor - Google Patents

A hermetic compressor weight balancing rotor Download PDF

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Publication number
WO2020057822A1
WO2020057822A1 PCT/EP2019/070496 EP2019070496W WO2020057822A1 WO 2020057822 A1 WO2020057822 A1 WO 2020057822A1 EP 2019070496 W EP2019070496 W EP 2019070496W WO 2020057822 A1 WO2020057822 A1 WO 2020057822A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor
packet
weight balancing
permanent magnets
gaps
Prior art date
Application number
PCT/EP2019/070496
Other languages
French (fr)
Inventor
Cansin KORKMAZ
Yasin BATUR
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to EP19748524.6A priority Critical patent/EP3853973A1/en
Publication of WO2020057822A1 publication Critical patent/WO2020057822A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/16—Centering rotors within the stator; Balancing rotors
    • H02K15/165—Balancing the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/04—Balancing means

Definitions

  • the present invention relates to the direct current electric motor of a variable capacity hermetic compressor wherein the permanent magnets of the rotor thereof are fixed at a plurality of planes.
  • the present invention more particularly relates to the magnet-rotor of the BLDC electric motor.
  • the variable capacity hermetic refrigeration compressor generally comprises a BLDC electric motor which includes a magnet-rotor and a stator.
  • the stator of the BLDC electric motor is produced by placing coils composed of conductive wires into the slots in the stator packet.
  • the rotor which is placed at the center of the motor without any contact with the stator, is composed of the packet containing magnetic plates placed one above the other, magnets placed into the gaps formed at certain intervals in said packet, sheet metal plates which are fixed onto the lower and upper surfaces of the rotor packet via a connector element in order to prevent the falling off of the magnets, and weights fixed onto the lower and upper surfaces of said plates.
  • a metal compressor body is placed onto the stator, and the compressor body supports basic mechanical components such as cylinder, piston, crank and connecting rod, crankpin, etc.
  • the rotor is mounted snap-fittingly onto the crank.
  • the rotor By means of the effect of the magnetic field generated by the electric current passing through the windings of the stator of the motor, the rotor, which is positioned at the center of the magnetic field and which is mounted snap-fittingly to the crank, is enabled to be rotated.
  • the rotating rotor rotates the crank and moves the connecting rod connected to the crank, thus compressing the refrigerant fluid received into the compressor body.
  • weights in the form of half rings are asymmetrically placed onto the lower and upper surfaces of the rotor packet in order to balance the unbalanced force generated by the movement of the crank, the connecting rod, piston and the crankpin.
  • the weights placed onto the lower and upper surfaces of the rotor packet in order to balance the unbalanced force generated by the movable components of the compressor limit the design of other components of the compressor due to the space occupied.
  • connector elements are used to fix the weights onto the rotor, thus increasing the costs.
  • the mounting of the weights onto the rotor requires an additional operation during the production of the compressor.
  • US2012269667 discloses a design for separating the compressor lubricant and the pressurized refrigerant fluid from each other in a compressor rotor with an additional weight thereon.
  • US2008267799 discloses a design for decreasing the frictional resistance of the refrigerant fluid acting on the additional weight placed onto the compressor rotor during the rotational movement.
  • the aim of the present invention is the realization of a BLDC electric motor rotor wherein the disadvantages occurring while balancing the unbalanced force generated by the movable components of the compressor with additional weights in the state of the art embodiments are eliminated in a cost-effective manner, thus providing an improved production and improved assembly and decreasing the design limitations of other components positioned in the vicinity of the compressor rotor.
  • the rotor of the present invention comprises a rotor packet composed of magnetic sheet metal plates; sheet metal caps which cover the lower and upper surfaces of the rotor packet; slots which start from the lower or upper surface of the rotor packet, at least one thereof from a different surface and wherein the permanent magnets are placed in the magnetic sheet metal plates; and gaps which remain in said slots after the placement of the permanent magnets.
  • the main advantage of the present invention is that by placing some of the permanent magnets into the slots opened on the lower surface of the rotor packet and some into the slots opened on the upper surface of the rotor packet and by means of the gaps left by the permanent magnets, the weight distribution of the rotor packet is changed without using any additional weights, thus balancing the unbalanced forces of the compressor. Balancing of the forces decreases the vibration level of the compressor.
  • the elimination of the requirement for additional weights and connector elements used for fixing said weights provides advantage in costs and assembly. Moreover, since the volume occupied by the weights added onto the rotor is freed, the design limitations of the components in the vicinity of the rotor are decreased.
  • the mass distribution of the rotor can be optimized by changing the heights of the gaps on the rotor packet according to the magnitude of the unbalanced force which changes depending on the mass of the movable components of the hermetic compressor such as crank, connecting rod and piston.
  • the depths of the slots opened on the lower and upper surfaces of the rotor packet in order to improve the vibration absorption efficiency can be different from each other.
  • said magnets are fixed to the rotor packet by means of adhesion or any connection methods such as snap-fitting, etc.
  • Figure 1 is the cross-sectional view of the hermetic compressor.
  • Figure 2 is the cross-sectional view of the rotor of the present invention.
  • Figure 3 is the top view of the rotor of the present invention.
  • the weight balancing rotor (1) is suitable for use in a brushless DC electric motor (12) of a hermetic compressor (2).
  • the brushless DC electric motor (12) comprises a stator (13) and a weight balancing rotor (1).
  • the weight balancing rotor (1) is composed of a rotor packet (7), an even number of permanent magnets (3) which are disposed into the rotor packet (7), rotor caps (4) which are fixed onto the lower and upper surfaces of the rotor packet (7) by means of connector elements, and gaps (5) provided between the permanent magnets (3) and the rotor caps (4).
  • the weight balancing rotor (1) is fixed snap-fittingly onto a crankshaft (15) placed to a body (17) having a bearing (16).
  • the weight balancing rotor (1) which rotates in the magnetic field generated by the electric current passing through the stator (13) of the brushless DC electric motor (12), rotates the crankshaft (15) as well.
  • the connecting rod (20) connected to the crankshaft (15) converts the rotational movement into axial movement and moves the piston (18) whereto the connecting rod (20) is connected via a pin (21).
  • the weight balancing rotor (1) balances the unbalanced force generated by the movable components, that is the crankshaft (15), the connecting rod (20), the pin (21) and the piston (18), in order to eliminate high level of vibrations.
  • the peripheral mass distribution of the weight balancing rotor (1) can be changed.
  • the unbalanced forces in the compressor (2 ) can be balanced without using any additional weight.
  • the required force is provided by changing the volume of the gap (5) between the rotor caps (4) by changing the dimensions of the permanent magnets (3) fixed onto the rotor packet (7) and/or the height of the rotor packet (7).
  • the vibrations in the compressor (2) are reduced without requiring any additional structure providing weight and the assembly of this structure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Compressor (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The present invention relates to the brushless direct current electric motor (12) of a variable capacity hermetic compressor (2) wherein the permanent magnets (3) of the rotor (1) thereof are fixed at a plurality of planes. The present invention more particularly relates to the rotor (1) with permanent magnets (3) of the BLDC electric motor (12). The brushless DC electric motor (12) comprises a stator (13) and a weight balancing rotor (1). The weight balancing rotor (1) is composed of a rotor packet (7), an even number of permanent magnets (3) which are disposed into the rotor packet (7), rotor caps (4) which are fixed onto the lower and upper surfaces of the rotor packet (7) by means of connector elements, and gaps (5) provided between the permanent magnets (3) and the rotor caps (4).

Description

A HERMETIC COMPRESSOR WEIGHT BALANCING ROTOR
The present invention relates to the direct current electric motor of a variable capacity hermetic compressor wherein the permanent magnets of the rotor thereof are fixed at a plurality of planes. The present invention more particularly relates to the magnet-rotor of the BLDC electric motor.
Hermetic refrigeration compressors with variable refrigeration capacities which are used in the refrigeration appliances such as domestic refrigerators are commonly known in the art. The variable capacity hermetic refrigeration compressor generally comprises a BLDC electric motor which includes a magnet-rotor and a stator. The stator of the BLDC electric motor is produced by placing coils composed of conductive wires into the slots in the stator packet. The rotor, which is placed at the center of the motor without any contact with the stator, is composed of the packet containing magnetic plates placed one above the other, magnets placed into the gaps formed at certain intervals in said packet, sheet metal plates which are fixed onto the lower and upper surfaces of the rotor packet via a connector element in order to prevent the falling off of the magnets, and weights fixed onto the lower and upper surfaces of said plates. In the hermetic compressor, a metal compressor body is placed onto the stator, and the compressor body supports basic mechanical components such as cylinder, piston, crank and connecting rod, crankpin, etc. The rotor is mounted snap-fittingly onto the crank.
By means of the effect of the magnetic field generated by the electric current passing through the windings of the stator of the motor, the rotor, which is positioned at the center of the magnetic field and which is mounted snap-fittingly to the crank, is enabled to be rotated. The rotating rotor rotates the crank and moves the connecting rod connected to the crank, thus compressing the refrigerant fluid received into the compressor body. Generally, weights in the form of half rings are asymmetrically placed onto the lower and upper surfaces of the rotor packet in order to balance the unbalanced force generated by the movement of the crank, the connecting rod, piston and the crankpin.
The weights placed onto the lower and upper surfaces of the rotor packet in order to balance the unbalanced force generated by the movable components of the compressor limit the design of other components of the compressor due to the space occupied. Moreover, connector elements are used to fix the weights onto the rotor, thus increasing the costs. The mounting of the weights onto the rotor requires an additional operation during the production of the compressor.
In the International Patent Application No. WO2017130565, a compressor rotor is disclosed wherein an additional weight is used.
The United States Patent Application No. US2012269667 discloses a design for separating the compressor lubricant and the pressurized refrigerant fluid from each other in a compressor rotor with an additional weight thereon.
The United States Patent Application No. US2008267799 discloses a design for decreasing the frictional resistance of the refrigerant fluid acting on the additional weight placed onto the compressor rotor during the rotational movement.
The aim of the present invention is the realization of a BLDC electric motor rotor wherein the disadvantages occurring while balancing the unbalanced force generated by the movable components of the compressor with additional weights in the state of the art embodiments are eliminated in a cost-effective manner, thus providing an improved production and improved assembly and decreasing the design limitations of other components positioned in the vicinity of the compressor rotor.
The rotor of the present invention comprises a rotor packet composed of magnetic sheet metal plates; sheet metal caps which cover the lower and upper surfaces of the rotor packet; slots which start from the lower or upper surface of the rotor packet, at least one thereof from a different surface and wherein the permanent magnets are placed in the magnetic sheet metal plates; and gaps which remain in said slots after the placement of the permanent magnets.
The main advantage of the present invention is that by placing some of the permanent magnets into the slots opened on the lower surface of the rotor packet and some into the slots opened on the upper surface of the rotor packet and by means of the gaps left by the permanent magnets, the weight distribution of the rotor packet is changed without using any additional weights, thus balancing the unbalanced forces of the compressor. Balancing of the forces decreases the vibration level of the compressor. The elimination of the requirement for additional weights and connector elements used for fixing said weights provides advantage in costs and assembly. Moreover, since the volume occupied by the weights added onto the rotor is freed, the design limitations of the components in the vicinity of the rotor are decreased.
The mass distribution of the rotor can be optimized by changing the heights of the gaps on the rotor packet according to the magnitude of the unbalanced force which changes depending on the mass of the movable components of the hermetic compressor such as crank, connecting rod and piston.
The depths of the slots opened on the lower and upper surfaces of the rotor packet in order to improve the vibration absorption efficiency can be different from each other.
In order to prevent the permanent magnets from moving in the gap during the transport of the compressor or the rotation of the rotor, said magnets are fixed to the rotor packet by means of adhesion or any connection methods such as snap-fitting, etc.
Additional features and additional advantageous effects of the retainer assembly and the electric motor of the present invention will become more apparent with the detailed description of the embodiments with reference to the accompanying drawings in which:
Figure 1 is the cross-sectional view of the hermetic compressor.
Figure 2 is the cross-sectional view of the rotor of the present invention.
Figure 3 is the top view of the rotor of the present invention.
The following numerals are referred to in the description of the present invention:
  1. Weight balancing rotor
  2. Compressor
  3. Permanent magnet
  4. Rotor caps
  5. Gap
  6. Connector element
  7. Rotor packet
  8. Upper casing
  9. Lower casing
  10. Chamber
  11. Tube
  12. Brushless direct current electric motor
  13. Stator
  14. Cylinder head
  15. Crankshaft
  16. Bearing
  17. Body
  18. Piston
  19. Cylinder Bore
  20. Connecting rod
  21. Pin
  22. Suction muffler
  23. Exhaust chamber
  24. Exhaust port
  25. Valve plate
  26. Suction plenum
  27. Cylinder block
The weight balancing rotor (1) is suitable for use in a brushless DC electric motor (12) of a hermetic compressor (2).
The brushless DC electric motor (12) comprises a stator (13) and a weight balancing rotor (1). The weight balancing rotor (1) is composed of a rotor packet (7), an even number of permanent magnets (3) which are disposed into the rotor packet (7), rotor caps (4) which are fixed onto the lower and upper surfaces of the rotor packet (7) by means of connector elements, and gaps (5) provided between the permanent magnets (3) and the rotor caps (4).
The weight balancing rotor (1) is fixed snap-fittingly onto a crankshaft (15) placed to a body (17) having a bearing (16). The weight balancing rotor (1), which rotates in the magnetic field generated by the electric current passing through the stator (13) of the brushless DC electric motor (12), rotates the crankshaft (15) as well. The connecting rod (20) connected to the crankshaft (15) converts the rotational movement into axial movement and moves the piston (18) whereto the connecting rod (20) is connected via a pin (21). The weight balancing rotor (1) balances the unbalanced force generated by the movable components, that is the crankshaft (15), the connecting rod (20), the pin (21) and the piston (18), in order to eliminate high level of vibrations. By means of the gap (5) formed between the rotor caps (4) and at least one of the permanent magnets (3) which are fixed onto the rotor packet (7) in a snap-fitting manner or by means of a fixing means, the peripheral mass distribution of the weight balancing rotor (1) can be changed. By means of the variable mass distribution of the weight balancing rotor (1), the unbalanced forces in the compressor (2) can be balanced without using any additional weight. The required force is provided by changing the volume of the gap (5) between the rotor caps (4) by changing the dimensions of the permanent magnets (3) fixed onto the rotor packet (7) and/or the height of the rotor packet (7).
By means of the weight balancing rotor (1) of the present invention, the vibrations in the compressor (2) are reduced without requiring any additional structure providing weight and the assembly of this structure.

Claims (4)

  1. A weight balancing rotor (1) for a hermetic compressor (2) comprising a rotor packet (7) which is composed of magnetic plates in cylindrical form, a plurality of permanent magnets (3) which are placed into the rotor packet (7) and a plurality of rotor caps (4) which are fixed onto the lower and upper surfaces of the rotor packet (7) by means of connector elements (6), characterized by a plurality of permanent magnets (3) which are placed into an even number of gaps (5) formed by processing opposite surfaces on the rotor packet (7) and which are shorter than said gaps (5).
  2. A weight balancing rotor (1) as in Claim 1, characterized by a plurality of gaps (5) which are formed in one or more than one different volume.
  3. A weight balancing rotor (1) as in Claim 1, characterized in that said permanent magnets (3), which ensure that the volumes of the gaps (5) in the rotor packet (7) do not change, are fixed by snap-fitting or by adhesion.
  4. A weight balancing rotor (1) as in any one of the above claims, characterized by the gaps (5) of which the volumes can be changed by changing the height of the rotor packet (7).
PCT/EP2019/070496 2018-09-17 2019-07-30 A hermetic compressor weight balancing rotor WO2020057822A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19748524.6A EP3853973A1 (en) 2018-09-17 2019-07-30 A hermetic compressor weight balancing rotor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201813335 2018-09-17
TRA2018/13335 2018-09-17

Publications (1)

Publication Number Publication Date
WO2020057822A1 true WO2020057822A1 (en) 2020-03-26

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PCT/EP2019/070496 WO2020057822A1 (en) 2018-09-17 2019-07-30 A hermetic compressor weight balancing rotor

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EP (1) EP3853973A1 (en)
WO (1) WO2020057822A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4024670A1 (en) 2020-12-30 2022-07-06 Arçelik Anonim Sirketi A rotor comprising magnets used as balance weight and a hermetic compressor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538472A1 (en) * 1990-07-12 1993-04-28 Seiko Epson Corporation Rotor of brushless motor and manufacture thereof
EP1983636A1 (en) * 2006-02-08 2008-10-22 Toyota Jidosha Kabushiki Kaisha Rotor manufacturing method
US20080267799A1 (en) 2007-03-28 2008-10-30 Samsung Gwangju Electronics Co., Ltd. Hermetic type compressor
US20120269667A1 (en) 2010-08-23 2012-10-25 Panasonic Corporation Hermetic compressor
US20150155747A1 (en) * 2013-11-29 2015-06-04 Samsung Electronics Co., Ltd. Motor and washing machine having the same
US20150333582A1 (en) * 2012-12-21 2015-11-19 Mitsubishi Electric Corporation Compressor, heat pump device, air conditioner, and freezing machine
WO2017130565A1 (en) 2016-01-26 2017-08-03 東芝キヤリア株式会社 Hermetic-type compressor and refrigeration cycle apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0538472A1 (en) * 1990-07-12 1993-04-28 Seiko Epson Corporation Rotor of brushless motor and manufacture thereof
EP1983636A1 (en) * 2006-02-08 2008-10-22 Toyota Jidosha Kabushiki Kaisha Rotor manufacturing method
US20080267799A1 (en) 2007-03-28 2008-10-30 Samsung Gwangju Electronics Co., Ltd. Hermetic type compressor
US20120269667A1 (en) 2010-08-23 2012-10-25 Panasonic Corporation Hermetic compressor
US20150333582A1 (en) * 2012-12-21 2015-11-19 Mitsubishi Electric Corporation Compressor, heat pump device, air conditioner, and freezing machine
US20150155747A1 (en) * 2013-11-29 2015-06-04 Samsung Electronics Co., Ltd. Motor and washing machine having the same
WO2017130565A1 (en) 2016-01-26 2017-08-03 東芝キヤリア株式会社 Hermetic-type compressor and refrigeration cycle apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4024670A1 (en) 2020-12-30 2022-07-06 Arçelik Anonim Sirketi A rotor comprising magnets used as balance weight and a hermetic compressor

Also Published As

Publication number Publication date
EP3853973A1 (en) 2021-07-28

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