WO2019134847A1 - Method for producing a stator - Google Patents

Method for producing a stator Download PDF

Info

Publication number
WO2019134847A1
WO2019134847A1 PCT/EP2018/086297 EP2018086297W WO2019134847A1 WO 2019134847 A1 WO2019134847 A1 WO 2019134847A1 EP 2018086297 W EP2018086297 W EP 2018086297W WO 2019134847 A1 WO2019134847 A1 WO 2019134847A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
plastic material
radially inner
encapsulated
inner region
Prior art date
Application number
PCT/EP2018/086297
Other languages
German (de)
French (fr)
Inventor
Boris Rinn
Tilo SCHÄFER
Original Assignee
Magna Powertrain Bad Homburg GmbH
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
Priority to DE102018200192.8 priority Critical
Priority to DE102018200192.8A priority patent/DE102018200192B3/en
Application filed by Magna Powertrain Bad Homburg GmbH filed Critical Magna Powertrain Bad Homburg GmbH
Publication of WO2019134847A1 publication Critical patent/WO2019134847A1/en

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K15/00Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12Impregnating, heating or drying of windings, stators, rotors or machines
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K15/00Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/08Insulating casings

Abstract

The invention relates to a method for producing a stator (35) comprising a stator iron core (36) which is coated with a plastic material (43). The aim of the invention is to improve the stator, particularly in terms of the function thereof during operation, for example in a fluid machine and/or in terms of its producibility. To this end, the stator iron core (36) is not coated with the plastic material (43) in a specific radial inner region (53).

Description

 Method for producing a stator

The invention relates to a method for producing a stator comprising a laminated stator core, which is encapsulated with a plastic material. The invention further relates to a stator with a laminated stator core, which is encapsulated with a plastic material. The invention also relates to a tool for producing such a stator. The invention also relates to a fluidic machine, in particular a hydraulic flow machine or pump, with such a stator.

German Patent Application DE 17281881 A1 discloses a T pump unit with an electric motor and a pump driven by it, which are accommodated in a common housing, which can be submerged in the pumped liquid, wherein the stator of the electric motor and its winding are embedded in a plastic mass, preferably encapsulated with egg ner thermoplastic plastic mass, which leaves only the outer periphery of the stator substantially free and in conjunction with a surrounding the stator at a certain distance tube of good heat conducting material forms a chamber containing a good heat transferring insulating medium, said the plastic mass of the encapsulation also surrounds the inner circumference of the stator in a thin layer. From the German patent DE 10 2013 201 320 B4 a method for producing a segmented stator is known, the yoke is divided in each case between adjacent pole teeth in a work tool with a concentrically arranged about an axis forming surface, wherein the molding surface, the inner diameter of the stator has, between the mold surface and a head surface of the pole teeth before filling the molding compound is a distance, wherein the Kopfflä surface at least partially abuts the mold surface during the filling of the molding material, wherein the mold surface has a shape corresponding to the head surface. German patent application DE 10 2006 049 292 A1 discloses a canned motor with a split tube that separates the rotor formed as a wet rotor and the motor shaft from the motor stator, wherein parts of the stator, in particular the stator winding, are encapsulated by plastic, the split tube is encapsulated by the plastic of the motor stator.

From DE 20 201 1 003 833 U1 a method for producing an electrical Maschi nenbekannt, wherein the laminated stator core is encapsulated, but the air gap facing side does not need to be covered with plastic. EP 2 006 978 A2 shows a stator with plastic extrusion with the omission of a coating of Be facing the air gap side.

The object of the invention is to provide a stator comprising a laminated stator core, which is encapsulated with a plastic material, in particular with regard to its function during operation, for example in a fluidic machine, and / or in view of its manufacturability to improve.

The object is in a method for producing a stator comprising a laminated stator core, which is encapsulated with a plastic material, wherein the laminated stator core is not specifically encapsulated in egg nem radially inner region with the plastic material, achieved in that in a radially inner region the stator is a cover means is arranged, with which the radially inner portion of the stator lamination is covered before the stator lamination is overmolded with the plastic material, wherein the cover comprises a flexible cover sleeve, which is radially inwardly so subjected to a fluid pressure, that the flexible cover sleeve preferably deformed substantially reversibly, so that a radially outer cover portion of the flexible cover sleeve comes into contact with the radially inner region of the stator lamination. As a result, a working air gap between the stator lamination stack and a rotor arranged radially inside the stator lamination stack can be kept very small. Thus, rotor and stator can be placed in close spatial contact with each other, ultimately increasing the efficiency and performance of an electric motor equipped with the stator and the rotor. The stator comprises in addition to the laminated stator core windings, which are encapsulated material material together with the laminated stator core with the plastic. The radially inner region of the stator is shown partially with the plastic material. A portion of the radially inner region of the stator, in particular the radially inner region of the laminated stator core, advantageously remains free of the plastic material. The omission of the radially inner region of the laminated stator core is advantageously realized with the aid of the covering device. About a sufficiently large selected fluid pressure, in particular hydraulic pressure, the flexible cover sleeve with the radially outer Abdeckab cut when inserting the stator lamination with the plastic material safely be kept in contact with the stator lamination. As a result, it can be effectively prevented that the radially inner region of the laminated stator core is encapsulated with the plastic material. Any existing flicker burrs in the region of the osculation between the cover sleeve and the laminated stator core can be removed in a subsequent operation, for example by brushing. A preferred embodiment of the method is characterized in that the cover is brought into contact with the radially inner portion of the stator lamination to prevent ingress of plastic material between the cover and the ra dial inner portion of the stator. With the cover is achieved in a simple manner and without additional manufacturing measures that the ra dial inner region of the laminated stator core is not specifically coated with the plastic material.

A further preferred embodiment of the method is characterized in that the laminated stator core is encapsulated with the plastic material, wherein undercut is formed between the radially inner region of the laminated stator core and end portions of the radially inner region of the stator. The undercut is formed by the deformation of the flexible cover sleeve radially outward against the radially inner portion of the stator lamination stack. Due to the flexible design of the cover, the undercut can be relatively easily implemented without wei tere tool technical measures.

Another preferred exemplary embodiment of the method is characterized in that the fluid pressure acting on the flexible covering sleeve is reduced until the flexible covering sleeve can be deformed back again and the stator can be demolded with the undercut. The preferably reversibly deformable cover sleeve, for example, from a temperature-resistant plastic material, such as polytetrafluoroethylene formed.

A further preferred exemplary embodiment of the method is characterized in that stator laminations of the stator lamination stack are adhesively joined together by adhesive bonding. When gluing the stator laminations are materially interconnected by a ge suitable material that an undesired Eindrin conditions of fluid, especially of a working fluid such as oil, in the operation of a gate with the Tor equipped fluidic machine, in particular hydraulic turbomachine or pump, is prevented between the stator laminations in the stator lamination.

In a stator with a stator lamination, which is encapsulated with a plastic material, the above object is alternatively or additionally achieved in that the stator lamination in a radially inner region, in particular according to a pre-described enclosed method, specifically not encapsulated with the plastic material , The stator can be traded separately. By the non-reserving of the plastic material inner region of the stator lamination packet, the radial distance between a rotor and the stator can be reduced. As a result, advantageously less magnetic material per torque requirement is needed. The efficiency of an electric motor equipped with the rotor and the stator increases. The heat dissipation to a medium is facilitated, which is promoted with a fluid machine, which is equipped with the electric motor.

A preferred embodiment of the stator is characterized in that the stator laminations of the laminated stator core are connected to each other by means of an insulating and adhesive material such that an undesired penetration of fluid between the stator laminations is prevented. In contrast to conventional adhesive packages, the material between tween the stator plates of the laminated stator core exerts not only an insulating function, but also to a sealing function. This sealing function is particularly advantageous in combination with the previously described very small air gap between the stator lamination stack and a rotor arranged radially inside the stator lamination stack.

The above object is also achieved by a tool for producing a previously described be stator, in particular according to a method described above, with a stamp, which is combined with a cover, with which the radially inner portion of the stator lamination is covered before the stator lamination in the tool with the plastic material is injected. The tool is preferably an injection molding tool with two mold halves. The injection of the Kunststoffmateri as is done for example on the parting plane between the two mold halves. From the cover device can advantageously be replaced in a simple manner when it is worn.

The invention further relates to a covering device, in particular a covering sleeve, and / or a stamp for a previously described tool. The parts mentioned can be traded separately.

The invention further relates to a fluidic machine, in particular a hydraulic fluid machine or pump, with a previously described stator. The pump with the stator is, for example, as an electrically driven oil pump, in particular as a side channel pump executed.

Further advantages, features and details of the invention will become apparent from the following description in which, with reference to the drawings, various execution examples are described in detail. Show it: 1 shows a fluidic machine with a housing and a conventional stator in section;

Figure 2 shows the stator of Figure 1 in a tool according to the invention without application of the method according to the invention in section; FIG. 3 shows the same illustration as in FIG. 2, wherein a stator laminated core of the stator is not specifically encapsulated in a radially inner region with plastic material;

FIG. 4 a stator laminated core with a stamped packet in half section; and

FIG. 5 shows a half-section of a stator lamination stack with stator laminations, which are connected in a material-tight and tight manner by adhesive bonding. 1 shows a fluidic machine 1 with a housing 2 is shown in section. In the fluidic machine 1 is a hydraulic pump, which is designed as a side channel pump, for example. The housing 2 of the fluidic machine 1 comprises a cover 3 and a stator 5.

The stator 5 comprises a laminated stator core 6 with a plurality of unspecified stator laminations and also with unspecified windings, which are arranged on at least egg nem winding support 7, 8. The windings comprise winding heads 9, 10, 11, 12, which are arranged outside the stator lamination stack 6.

The stator laminated core 6 with the windings, the winding carriers 7, 8 and the winding heads 9 to 12 is encapsulated with a plastic material 13 to represent the stator 5. The stator 5 includes radially inwardly a receiving space 14 for a magnetically active part of a (not shown) rotor.

The rotor and the stator 5 constitute an electromotive drive for the fluidic machine 1. In the cover 3 of the housing 2, a receiving space 15 for a hydraulically effective part of the rotor is provided. The hydraulically effective part of the rotor comprises, for example, an impeller rotatably connected to the magnetically active part of the rotor is connected ver. The stator 5 also includes a board 16, which is also encapsulated with the plastic material 13. The board 16 in turn is equipped with electronic components 17, such as Kondensato ren. In addition, the stator 5 comprises an electrical connection device 18. The electronic components 17 are wholly or partially injected with the plastic material 13 in order. The electrical connection device 18 is, at least partially, outside the Sta gate 5 accessible to connect an electrical supply line to the stator 5.

The stator lamination 6 of the stator 5 is completely encapsulated with the plastic material 13, in particular in a radially inner region 19 of the stator lamination 6. The plastic material 13 in the radially inner region 19 of the stator lamination 6 prevents the case of game that the stator laminations of the stator lamination 6 come into contact with a medium which is conveyed by the fluidic machine 1.

In FIGS. 2 and 3, a tool 20 with a lower tool half 21 and an upper tool half 22 is shown in section. In the tool 20 is an injection molding tool with a parting plane 23. In the tool 20, a punch 24 is arranged.

The punch 24 is combined with a cover 25 and a pin 26. The pin 26 serves to form a central bearing seat and, together with the punch 24 in the tool 20, is part of a shaping inner tool geometry.

The punch 24 comprises a hydraulic channel 28, via which a hydraulic pressure chamber 29 can be acted upon with egg NEM hydraulic pressure. About the hydraulic channel 28 is supplied according to demand dependent hydraulic medium until in the hydraulic pressure chamber 29 a desired hydraulic pressure prevails.

The covering device 25 comprises a flexible covering sleeve 30 which delimits the hydraulic pressure chamber 29. The hydraulic pressure chamber 29 has the shape of an annular space, which is sealed in FIGS. 2, 3 at the bottom and top with the aid of O-ring seals 31, 32 with respect to a cavity in the tool 20. The cavity is in the tool 20 outside of the two tool halves 21, 22 and inside of the punch 24 with the cover 25 be limited.

The cavity is used in the tool 20 for the representation of a stator 35 with a stator lamination packet 36. The stator 35 further comprises winding support 37 and windings 38. Zur electrical contact, the windings 38, for example, equipped with metal lugs 39 to 41.

The magnetically active parts of the stator 35, that is to say the stator plate 36, the winding carriers 37 with the windings 38 and the metal lugs 39 to 41 are injection-molded around the stator 35 in the cavity with a plastic material 43. In this case, a lid 46 is formed in the cavity of the tool 20 at the same time, which is connected by the plastic material 43 is a floor with the stator 35. The lid 46 corresponds to the cover 3 of the housin ses 2 of the fluidic machine 1 in Figure 1.

In Figure 2, the hydraulic pressure chamber 29 was not pressurized with hydraulic pressure. In order to inject the stator lamination 36 was completely encapsulated with the plastic material 43, even in a radially inner region 44. A radially inner portion 50 of the stator 35 includes in addition to the radially inner portion 44 of the stator lamination 36 Endab sections 51, 52nd Die End portions 51, 52 are, as well as the radially inner portion 44 of the stator lamination 36, formed of the plastic material 43.

In Figure 3 is shown what happens when the hydraulic pressure chamber 29 via the hydraulic channel 28 is acted upon radially within the cover 30 with a sufficiently large hydraulic pressure. The flexible cover sleeve 30 is so druckdruckraum 29 deformed by the hydraulic pressure in the hydra and pressed radially outward that the flexible cover sleeve 30 with a radially outer cover portion at a radially inner portion 53 of

Stator laminations 36 is applied. This advantageously prevents plastic material, which is injected, for example, via the parting plane 23 into the cavity of the tool 20, from reaching the radially inner region 53 of the laminated stator core 36.

The manufacture of the stator 35 with the tool 20 shown in Figure 3 is carried out for example as follows. First, the punch 24 is inserted with the pin 26, for example, in the upper mold half 22. For mounting the stator lamination 36, the upper mold half 22 is advantageously reversed with the punch 24. Then, the Statorblechpa ket 36 with the winding support 37, the windings 38 and the metal lugs 39 to 41 are placed from above simply on the upper mold half 22 with the punch 24. Then, the tool 20 can be closed by the two mold halves 21, 22 are brought together in the parting plane 23. Prior to injection, the hydraulic pressure chamber 29 via the hydraulic channel 28 with hy likdruck applied to the flexible cover sleeve 30, as shown in Figure 3, reversibly deform until the cover sleeve 30 abuts against the radially inner portion 53 of the stator lamination 36 and so the gap between the cover sleeve 30 and the stator lamination 36 for the subsequent injection process closes.

When molding the stator lamination 36 with the plastic material 43, the hydraulic pressure in the hydraulic pressure chamber 29 is maintained until the Umspritzungsprozess is completed. In this case, an undercut is formed between the radially inner region 53 of the laminated stator core 36 and the end sections 51, 52 of the radially inner region 50 of the stator 35.

After solidification of the plastic material 43 in the cavity of the tool 20, the hydraulic pressure in the hydraulic pressure chamber 29 is reduced via the hydraulic channel 28. From the cover sleeve 30 deforms reversibly back. Then the punch 24 can be pulled out with the cover sleeve 30 from. Subsequently, the molded with the plastic material 43 stator 35 can be removed from the mold. The plastic material 43 advantageously also forms the housing (2 in FIG. 1) for the fluidic machine. Only the radially inner portion 53 of the laminated stator core 36 is specifically excluded from the plastic material 43.

FIGS. 4 and 5 show two exemplary embodiments of a laminated stator core 60; 70 with a plurality of stator laminations 61, 62; 71, 72 each shown in half section. The

 Stator laminated core 60; For example, FIG. 70 is used in place of the above-described stator core sheet 36 in FIG.

The stator laminations 61, 62 of the stator lamination stack 60 shown in FIG. 4 are connected to one another in a form closure region 64 by a conventional stamped package. An axis of rotation of a rotor, not shown in Figure 4 is designated 63.

In Figure 5, a rotation axis of the rotor, also not shown, designated 73. The stator laminations 71, 72 of the laminated stator core 70 shown in FIG. 5 are connected to one another in a material-locking and particularly advantageous manner by adhesive bonding 74. By a dash in Figure 5, an insulating and adhesive material 75 is indicated, which, unlike in 5, is likewise arranged between the individual stator laminations 71, 72 in order to connect them to each other in a fluid-tight manner.

Bezuaszeichenliste

Fluidic machine

 casing

 cover

stator

stator lamination

winding support

winding support

winding head

winding head

winding head

winding head

Plastic material

accommodation space

accommodation space

circuit board

Electronic component

Electrical connection device

Radially inner area

Tool

Lower tool half

Upper tool half

parting plane

stamp

cover

pen

hydraulic channel

Hydraulic pressure area

cover sleeve

O-ring seal O-ring seal

stator

stator lamination

winding support

windings

tin flag

tin flag

tin flag

Plastic material

Radially inner area

cover

Radially inner area

end

end

Radially inner area

stator lamination

stator lamination

stator lamination

axis of rotation

Form-fit area

stator lamination

stator lamination

stator lamination

axis of rotation

Klebepaketierung

Insulating and / or adhesive material

Claims

claims
A method of manufacturing a stator (5; 35) comprising a stator lamination stack (6; 36; 70) encapsulated with a plastic material (13; 43), said stator lamination packet (6; 36; 70) in a radially inner region (53) specifically not with the plastic material (43) is encapsulated, characterized in that in a radially inner Be rich (50) of the stator (35) a covering device (25) is arranged, with which the radially is covered with the plastic material (43) before the stator lamination stack (36; 70) is encapsulated, wherein the cover device (25) comprises a flexible cover sleeve (30) which is radially inward in such a way is subjected to a fluid pressure that the flexible cover sleeve (30) preference, substantially reversibly deformed, so that a radially outer cover portion of the flexible cover sleeve (30) with the radially inner portion (53) of the Statorblechpa kets (36; 70) in Contact is coming.
2. The method according to claim 1, characterized in that the covering device (25) is brought into contact with the radially inner region (53) of the laminated stator core (36; 70) in order to prevent penetration of plastic material (43) between the covering device (25 ) and the radially inner region (50) of the stator (35).
3. The method according to claim 1, characterized in that the laminated stator core (36; 70) with the plastic material (43) is encapsulated, wherein between the radially in neren region (53) of the stator lamination stack (36; 70) and end portions (51, 52 ) of the ra dial inner region (50) of the stator (35) undercut is formed.
4. The method according to claim 1 or 2, characterized in that on the flexible cover sleeve (30) acting fluid pressure is reduced until the flexible cover sleeve (30) deformed back again and the stator (35) can be removed from the mold with the undercut.
5. The method according to any one of the preceding claims, characterized in that stator laminations (71, 72) of the laminated stator core (70) by a Klebepaketierung (74) are integrally connected to one another.
6. Stator (35) with a stator lamination (36; 70), which is encapsulated with a plastic material (43), characterized in that the stator lamination stack (36; 70) in a ra dial inner region (53), according to a method according to one of the preceding claims, specifically not with plastic material (43) is encapsulated.
7. Stator according to claim 6, characterized in that the stator laminations (71, 72) of the laminated stator core (70) by means of an insulating and adhesive material (75) are interconnected so that an undesirable penetration of fluid between the Statorble surface (71 , 72) is prevented.
8. tool (20) for producing a stator (35) according to claim 6 or 7, in particular according to a method according to one of claims 1 to 5, with a punch (24) which is combined with a covering device (25) with which the radially inner region (53) of the stator lamination stack (36; 70) is covered before the stator lamination packet (36; 70) in the tool (20) with the plastic material (43) is overmolded.
9. covering device (25), in particular covering sleeve (30), and / or punch (24) for a tool (20) according to claim 8.
10. fluidic machine (1), in particular hydraulic fluid machine or pump, with a stator (35) according to claim 6 or 7.
PCT/EP2018/086297 2018-01-08 2018-12-20 Method for producing a stator WO2019134847A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE102018200192.8 2018-01-08
DE102018200192.8A DE102018200192B3 (en) 2018-01-08 2018-01-08 Method for producing a stator

Publications (1)

Publication Number Publication Date
WO2019134847A1 true WO2019134847A1 (en) 2019-07-11

Family

ID=64902097

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/086297 WO2019134847A1 (en) 2018-01-08 2018-12-20 Method for producing a stator

Country Status (2)

Country Link
DE (1) DE102018200192B3 (en)
WO (1) WO2019134847A1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB976909A (en) * 1960-06-03 1964-12-02 Epoxylite Corp Encapsulation of electrical power component
DE1728181A1 (en) 1968-09-06 1972-02-03 Albert Blum A submersible pump unit
US3874073A (en) * 1972-01-06 1975-04-01 Gen Electric Method of manufacturing dynamoelectric machines
JPH05260708A (en) * 1992-03-09 1993-10-08 Toshiba Corp Manufacture of molded motor
DE102006049292A1 (en) 2006-10-19 2008-04-30 Wilo Ag Canned motor e.g. asynchronous motor, for circulating pump, has slit tube separating rotor from stator, part of stator e.g. stator winding, injection molded by plastic, and slit tube injection molded by plastic of stator
EP2006978A2 (en) 2007-06-19 2008-12-24 Hitachi, Ltd. Rotating electrical machine
DE202011003833U1 (en) 2010-03-15 2011-07-28 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan
US20150145351A1 (en) * 2012-04-27 2015-05-28 Moteurs Leroy-Somer Method for potting a stator
DE102013201320B4 (en) 2013-01-28 2016-10-13 Robert Bosch Gmbh Method for manufacturing a stator and stator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB976909A (en) * 1960-06-03 1964-12-02 Epoxylite Corp Encapsulation of electrical power component
DE1728181A1 (en) 1968-09-06 1972-02-03 Albert Blum A submersible pump unit
US3874073A (en) * 1972-01-06 1975-04-01 Gen Electric Method of manufacturing dynamoelectric machines
JPH05260708A (en) * 1992-03-09 1993-10-08 Toshiba Corp Manufacture of molded motor
DE102006049292A1 (en) 2006-10-19 2008-04-30 Wilo Ag Canned motor e.g. asynchronous motor, for circulating pump, has slit tube separating rotor from stator, part of stator e.g. stator winding, injection molded by plastic, and slit tube injection molded by plastic of stator
EP2006978A2 (en) 2007-06-19 2008-12-24 Hitachi, Ltd. Rotating electrical machine
DE202011003833U1 (en) 2010-03-15 2011-07-28 Ebm-Papst St. Georgen Gmbh & Co. Kg Fan
US20150145351A1 (en) * 2012-04-27 2015-05-28 Moteurs Leroy-Somer Method for potting a stator
DE102013201320B4 (en) 2013-01-28 2016-10-13 Robert Bosch Gmbh Method for manufacturing a stator and stator

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