WO2021251910A1 - Insulating ring in stators with a contact plate for electric motors - Google Patents

Insulating ring in stators with a contact plate for electric motors Download PDF

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Publication number
WO2021251910A1
WO2021251910A1 PCT/SI2021/050011 SI2021050011W WO2021251910A1 WO 2021251910 A1 WO2021251910 A1 WO 2021251910A1 SI 2021050011 W SI2021050011 W SI 2021050011W WO 2021251910 A1 WO2021251910 A1 WO 2021251910A1
Authority
WO
WIPO (PCT)
Prior art keywords
insulating ring
conductors
cut
contact plate
conductor
Prior art date
Application number
PCT/SI2021/050011
Other languages
French (fr)
Inventor
Klemen KAVCIC
Original Assignee
Domel d.o.o.
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 Domel d.o.o. filed Critical Domel d.o.o.
Priority to KR2020237000002U priority Critical patent/KR20230000322U/en
Priority to DE212021000395.8U priority patent/DE212021000395U1/en
Publication of WO2021251910A1 publication Critical patent/WO2021251910A1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/44—Protection against moisture or chemical attack; Windings specially adapted for operation in liquid or gas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

Definitions

  • the subject of the invention is an insulating ring in stators with a contact plate for motors, wherein the entire motor, i.e. the stator with the rotor, is immersed in a medium.
  • said motors are used to drive a hermetically sealed gas pump, for example for air conditioning compressors in the automotive industry.
  • the electric motors are EC (electronically commutated) electric motors.
  • the medium can be a variety of refrigerants that are legally allowed to be used for air conditioning compressors in the automotive industry. Since the entire motor is immersed in the medium, it is necessary to provide potted and completely insulated contacts on the contact plate.
  • the contact plate consists of a contact carrier and bus bars, the contact carrier having grooves in which bus bars are arranged for forming contacts with conductors.
  • the insulating ring which is, after the conductors have been wound, the conductors contacted with bus bars, and the bus bars and conductors welded together, mounted on the contact side of the motor in a slot between the front stator insulation and a contact carrier.
  • the insulating ring closes the gaps between the conductors and the contact carrier, which are caused by technological processes for the manufacture of electric motors.
  • the technical problem solved by the present invention is to provide potted and completely insulated contacts on the contact plate on the stator side, where the connection of the conductors to the bus bars mounted on the contact carrier is made.
  • the rest of the stator winding has an insulated wire and is not potted.
  • Non-insulated contacts i.e. bus bars and contacts of conductors with bus bars made of a portion of conductors with the insulation stripped off, i.e. with the insulation intendedly removed from conductors to provide for contacting (welding), are potted with a two-component epoxy compound which prevents electrical breakthrough between phases, to the housing of the stator or other conductive parts.
  • Figure 1 shows an insulating ring
  • FIG. 2 shows mounting of the insulating ring onto a stator
  • front section Figure 3 shows mounting of the insulating ring onto a stator
  • transverse section Figure 4 shows the shape of a tooth of the insulating ring.
  • An insulating ring 1 is formed as a uniform element substantially in the form of a low cylinder and is provided on the lower portion with an outer circumference la with a step 2 for abutting a step 4a of a front insulation 4 which is sprayed onto the stator, said ring 1 being provided on the lower portion of an inner circumference lb with spaced teeth 3 for receiving conductors 5, the number of teeth 3 being equal to the number of conductors 5.
  • the teeth 3 for receiving the conductors 5 are preferably equidistantly arranged.
  • the width and height of the step 2 is defined in such a way as to allow the insulating ring 1 to tightly abut the step 4a of the front insulation 4 and a contact support 6.
  • the height FI of the insulating ring 1 is defined such that the insulating ring 1 extends above the level of bus bars 7 and the level of the conductors 5, in order to ensure a sufficient application height of the two-component epoxy compound, with which the non-insulated contacts and connectors are potted once the insulating ring 1 is inserted into a slot 8 between the step 4a of the front insulation 4 and a front surface 6a of the contact carrier 6. Completely potted contacts on the contact plate are thus provided for.
  • the insulating ring 1 is optionally provided on the upper portion of the outer circumference la with an additional step 2a when this is necessary due to additional space constraints of the electric motor construction.
  • the tooth 3 is formed as a flat body projecting in the radial direction from the inner circumference lb of the insulating ring 1 towards the centre, the height L of the tooth 3 being such that the width D of the insulating ring 1 is, in the portion where the insulating ring 1 is provided with teeth 3 in radial direction, at least such as to completely seal gaps 9 between the conductors 5 and the contact carrier 6.
  • the insulating ring 1 abuts with its step 2 the step 4a of the front insulation, with its bottom surface lc abuts the surface of the slot 8 between the step 4a of the front insulation 4 and the front surface 6a of the contact carrier 6, thus sealing the gaps 9 along the conductors 5.
  • the cut-out 3b can continue into a section 3c when the conductors 5 are slightly spaced from the front surface 6a of the contact carrier 6, in order for the section 3c to further seal the gap 9 along an individual conductor 5 on the front surface 6a and abut the portion of the slot 8 between the front surface 6a of the contact carrier 6 and the conductor 5.
  • the inclination a of the ramp 3a is preferably between 30 and 40 degrees and allows the conductors 5 to slide along the ramp 3a to the desired location, i.e. into the cut-out 3b, when the insulating ring 1 is being installed.
  • the dimension of the cut-out 3b is in each case adapted to the dimension of the conductor 5, so that the conductor 5 is fixed in the cut-out 3b.
  • the cut-out 3b is formed as a substantially semi-circular cut-out, the radius of the semi-circular cut-out 3b being substantially equal to the radius of the conductor 5.
  • the insulating ring 1 When manufacturing a stator, i.e. after the conductors have been wound, the conductors 5 contacted with the bus bars 7, and the bus bars 7 and the conductors 5 welded, the insulating ring 1 is inserted into the slot 8 between the front surface 6a of the contact carrier 6 and the step 4a of the front insulation 4 which is sprayed onto the stator, so that each tooth 3 is located substantially in the middle of the distance between two adjacent conductors 5. After the insulating ring 1 has been inserted into the slot 8, the insulating ring 1 is rotated in the direction of the ramp 3a, whereby the conductors 5 slide along the ramp 3a into the section 3b.
  • the shape of the insulating ring 1 ensures that all the conductors 5 are correctly positioned, each in its own cut-out 3b, and seals the gaps 9 along the conductors 5.
  • the slot 8 with the inserted insulating ring 1 is then potted with a two-component epoxy resin.
  • the height H of the insulating ring 1 also determines the application height of the two-component epoxy compound which is used to seal the non-insulated contacts and connections.
  • the stator with the contact plate is usually formed in such a way that the contact carrier 6 with its outer circumference tightly abuts the inner circumference of the step 4a of the front insulation 4. In the event of a defective abutment during the manufacture of the stator, the construction of the insulating ring also enables the sealing of any resulting slot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)

Abstract

The subject of the invention is an insulating ring (1) in stators with a contact plate for motors, wherein the entire motor, i.e. the stator with the rotor, is immersed in a medium. The insulating ring (1) is formed as a uniform element substantially in the form of a low cylinder and is provided on the lower portion with an outer circumference (1a) with a step (2) for abutting a step (4a) of a front insulation (4) which is sprayed onto the stator, said ring (1) being provided on the lower portion of an inner circumference (1b) with spaced teeth (3) for receiving conductors (5). After the conductors (5) have been wound, the conductors (5) contacted with the bus bars (7), and the bus bars 7 and the conductors (5) welded, the insulating ring (1) is inserted into the slot (8) between the step (4a) of the front insulation (4) and the front surface (6a) of the contact carrier (6), thus providing completely insulated contacts on the contact plate before being potted with epoxy resin.

Description

Insulating ring in stators with a contact plate for electric motors
The subject of the invention is an insulating ring in stators with a contact plate for motors, wherein the entire motor, i.e. the stator with the rotor, is immersed in a medium. Preferably, said motors are used to drive a hermetically sealed gas pump, for example for air conditioning compressors in the automotive industry. Preferably, the electric motors are EC (electronically commutated) electric motors. The medium can be a variety of refrigerants that are legally allowed to be used for air conditioning compressors in the automotive industry. Since the entire motor is immersed in the medium, it is necessary to provide potted and completely insulated contacts on the contact plate. The contact plate consists of a contact carrier and bus bars, the contact carrier having grooves in which bus bars are arranged for forming contacts with conductors.
This is made possible by a special form of the insulating ring which is, after the conductors have been wound, the conductors contacted with bus bars, and the bus bars and conductors welded together, mounted on the contact side of the motor in a slot between the front stator insulation and a contact carrier. The insulating ring closes the gaps between the conductors and the contact carrier, which are caused by technological processes for the manufacture of electric motors.
The technical problem solved by the present invention is to provide potted and completely insulated contacts on the contact plate on the stator side, where the connection of the conductors to the bus bars mounted on the contact carrier is made. The rest of the stator winding has an insulated wire and is not potted. Non-insulated contacts, i.e. bus bars and contacts of conductors with bus bars made of a portion of conductors with the insulation stripped off, i.e. with the insulation intendedly removed from conductors to provide for contacting (welding), are potted with a two-component epoxy compound which prevents electrical breakthrough between phases, to the housing of the stator or other conductive parts.
Since the technology of manufacturing stators with a contact plate does not provide for sufficient tightness of uninsulated contacts before potting with an epoxy compound, a structural solution is needed to provide additional conditions for sealing the space around the uninsulated contacts.
The applicant is not familiar with any prior art solutions to the implementation of electric motors with a contact plate, where the whole motor is immersed in the medium, which would ensure sufficient tightness of non-insulated contacts. Said technical problem is solved by a special form of the insulating ring which is, after the conductors have been wound, contacted with bus bars, and the bus bars and conductors welded, inserted into a slot between the front stator insulation and a contact carrier, said ring providing for sufficient tightness of the non-insulated contacts prior to potting with an epoxy compound.
The invention will be described hereinbelow and illustrated on the figures which show:
Figure 1 shows an insulating ring
Figure 2 shows mounting of the insulating ring onto a stator, front section Figure 3 shows mounting of the insulating ring onto a stator, transverse section Figure 4 shows the shape of a tooth of the insulating ring.
An insulating ring 1 is formed as a uniform element substantially in the form of a low cylinder and is provided on the lower portion with an outer circumference la with a step 2 for abutting a step 4a of a front insulation 4 which is sprayed onto the stator, said ring 1 being provided on the lower portion of an inner circumference lb with spaced teeth 3 for receiving conductors 5, the number of teeth 3 being equal to the number of conductors 5. The teeth 3 for receiving the conductors 5 are preferably equidistantly arranged.
The width and height of the step 2 is defined in such a way as to allow the insulating ring 1 to tightly abut the step 4a of the front insulation 4 and a contact support 6.
The height FI of the insulating ring 1 is defined such that the insulating ring 1 extends above the level of bus bars 7 and the level of the conductors 5, in order to ensure a sufficient application height of the two-component epoxy compound, with which the non-insulated contacts and connectors are potted once the insulating ring 1 is inserted into a slot 8 between the step 4a of the front insulation 4 and a front surface 6a of the contact carrier 6. Completely potted contacts on the contact plate are thus provided for.
The insulating ring 1 is optionally provided on the upper portion of the outer circumference la with an additional step 2a when this is necessary due to additional space constraints of the electric motor construction.
The tooth 3 is formed as a flat body projecting in the radial direction from the inner circumference lb of the insulating ring 1 towards the centre, the height L of the tooth 3 being such that the width D of the insulating ring 1 is, in the portion where the insulating ring 1 is provided with teeth 3 in radial direction, at least such as to completely seal gaps 9 between the conductors 5 and the contact carrier 6. The insulating ring 1 abuts with its step 2 the step 4a of the front insulation, with its bottom surface lc abuts the surface of the slot 8 between the step 4a of the front insulation 4 and the front surface 6a of the contact carrier 6, thus sealing the gaps 9 along the conductors 5.
The side of the tooth 3, which is adapted to receive a conductor 5, viewed from the inner circumference lb of the insulating ring 1 in a radial direction towards the centre of the ring 1, is first formed with a ramp 3a that continues into a cut-out 3b.
Optionally, the cut-out 3b can continue into a section 3c when the conductors 5 are slightly spaced from the front surface 6a of the contact carrier 6, in order for the section 3c to further seal the gap 9 along an individual conductor 5 on the front surface 6a and abut the portion of the slot 8 between the front surface 6a of the contact carrier 6 and the conductor 5.
The inclination a of the ramp 3a is preferably between 30 and 40 degrees and allows the conductors 5 to slide along the ramp 3a to the desired location, i.e. into the cut-out 3b, when the insulating ring 1 is being installed.
The dimension of the cut-out 3b is in each case adapted to the dimension of the conductor 5, so that the conductor 5 is fixed in the cut-out 3b. In a preferred embodiment, the cut-out 3b is formed as a substantially semi-circular cut-out, the radius of the semi-circular cut-out 3b being substantially equal to the radius of the conductor 5.
When manufacturing a stator, i.e. after the conductors have been wound, the conductors 5 contacted with the bus bars 7, and the bus bars 7 and the conductors 5 welded, the insulating ring 1 is inserted into the slot 8 between the front surface 6a of the contact carrier 6 and the step 4a of the front insulation 4 which is sprayed onto the stator, so that each tooth 3 is located substantially in the middle of the distance between two adjacent conductors 5. After the insulating ring 1 has been inserted into the slot 8, the insulating ring 1 is rotated in the direction of the ramp 3a, whereby the conductors 5 slide along the ramp 3a into the section 3b. The shape of the insulating ring 1 ensures that all the conductors 5 are correctly positioned, each in its own cut-out 3b, and seals the gaps 9 along the conductors 5. The slot 8 with the inserted insulating ring 1 is then potted with a two-component epoxy resin. The height H of the insulating ring 1 also determines the application height of the two-component epoxy compound which is used to seal the non-insulated contacts and connections. The stator with the contact plate is usually formed in such a way that the contact carrier 6 with its outer circumference tightly abuts the inner circumference of the step 4a of the front insulation 4. In the event of a defective abutment during the manufacture of the stator, the construction of the insulating ring also enables the sealing of any resulting slot.

Claims

Claims
1. An insulating ring (1) in stators with a contact plate for electric motors, wherein on the contact plate a connection of conductors (5) to bus bars (7) arranged in the grooves formed on a contact carrier (6) is formed, characterized in that the insulating ring (1) is formed as a uniform element substantially in the form of a low cylinder and is provided on the lower portion with an outer circumference (la) with a step (2) for abutting a step (4a) of a front insulation (4) which is sprayed onto the stator, said ring (1) being provided on the lower portion of an inner circumference (lb) with spaced teeth (3) for receiving conductors (5), the number of teeth (3) being equal to the number of conductors (5).
2. The insulating ring according to claim 1, characterized in that the tooth (3) is formed as a flat body projecting in the radial direction from the inner circumference (lb) of the insulating ring (1) towards the centre, the height (L) of the tooth (3) being such that the width (D) of the insulating ring (1) is, in the portion where the insulating ring (1) is provided with teeth (3) in radial direction, at least such as to completely seal gaps (9) between the conductors (5) and the contact carrier (6).
3. The insulating ring according to claims 1 and 2, characterized in that the side of the tooth (3), which is adapted to receive a conductor (5), viewed from the inner circumference (lb) of the insulating ring (1) in a radial direction towards the centre of the ring (1), is first formed with a ramp (3a) that continues into a cut-out (3b).
4. The insulating ring according to preceding claims, characterized in that the inclination (a) of the ramp (3a) is preferably between 30 and 40 degrees.
5. The insulating ring according to preceding claims, characterized in that the dimension of the cut out (3b) is in each case adapted to the dimension of the conductor (5) to allow fixing the conductor (5) into the cut-out (3b).
6. The insulating ring according to preceding claims, characterized in that the cut-out (3b) is formed as a substantially semi-circular cut-out, the radius of the semi-circular cut-out (3b) being substantially equal to the radius of the conductor (5).
7. The insulating ring according to preceding claims, characterized in that the width and height of the step (2) is defined in such a way as to allow the insulating ring (1) to tightly abut the step (4a) of the front insulation (4) and a contact support (6).
8. The insulating ring according to preceding claims, characterized in that the height (H) of the insulating ring (1) is defined such that the insulating ring (1) extends above the level of bus bars (7) and the level of the conductors (5) to ensure a sufficient application height of the two-component epoxy compound, with which the non-insulated contacts and connectors are potted once the insulating ring (1) is inserted into a slot (8) between the step (4a) of the front insulation (4) and a front surface (6a) of the contact carrier (6).
PCT/SI2021/050011 2020-06-08 2021-05-26 Insulating ring in stators with a contact plate for electric motors WO2021251910A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR2020237000002U KR20230000322U (en) 2020-06-08 2021-05-26 Insulation ring of stator with contact plate for electric motor
DE212021000395.8U DE212021000395U1 (en) 2020-06-08 2021-05-26 Insulating ring in stators with a contact plate for electric motors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SIP-202000100 2020-06-08
SI202000100A SI26024A (en) 2020-06-08 2020-06-08 Insulation ring for stators with contact plate for electric motors

Publications (1)

Publication Number Publication Date
WO2021251910A1 true WO2021251910A1 (en) 2021-12-16

Family

ID=76695805

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SI2021/050011 WO2021251910A1 (en) 2020-06-08 2021-05-26 Insulating ring in stators with a contact plate for electric motors

Country Status (4)

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KR (1) KR20230000322U (en)
DE (1) DE212021000395U1 (en)
SI (1) SI26024A (en)
WO (1) WO2021251910A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140015349A1 (en) * 2012-07-11 2014-01-16 Remy Technologies, Llc Interlocking coil isolators for resin retention in a segmented stator assembly
US20160301277A1 (en) * 2013-12-03 2016-10-13 Pierburg Gmbh Stator for an electronically commutated direct current motor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140015349A1 (en) * 2012-07-11 2014-01-16 Remy Technologies, Llc Interlocking coil isolators for resin retention in a segmented stator assembly
US20160301277A1 (en) * 2013-12-03 2016-10-13 Pierburg Gmbh Stator for an electronically commutated direct current motor

Also Published As

Publication number Publication date
DE212021000395U1 (en) 2023-02-10
KR20230000322U (en) 2023-02-13
SI26024A (en) 2021-12-31

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