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
  • H02K1/12—Stationary parts of the magnetic circuit
  • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T29/00—Metal working
  • Y10T29/49—Method of mechanical manufacture
  • Y10T29/49002—Electrical device making
  • Y10T29/49009—Dynamoelectric machine

Definitions

• the invention relates to a stator, in particular a caseless electric machine with liquid cooling, as well as a manufacturing method of such a stator assembly.
• water is typically used as the cooling medium passing through metal pipes such as e.g. passed through copper or steel tubes. These tubes can be laid meander-shaped through the stator of the electrical machine.
• deflection means such. U-tubes, or connected to a deflection chamber.
• a cooling water inlet and a cooling water outlet must be provided. The heated cooling water is fed to a heat exchanger or a cooler, through which the majority of the waste heat of the electric machine can be dissipated to the environment.
• the stator of an electrical machine is usually made of sheet metal in order to minimize the eddy current losses that occur during the excitation.
• the stator is designed for this purpose as a laminated core of a plurality of thin Dynamo sheets in an axial stacking sequence.
• a laminated core of a plurality of thin Dynamo sheets in an axial stacking sequence.
• For cooling the electric machine in particular in the sheet metal section of a stator dynamo plate corresponding recesses, preferably provided in the form of punched out. After assembly of the laminated core arise axially extending cooling channels through which, for example, air can be passed to cool.
• metal pipes can be fitted in the channels formed by the punching, wherein the diameter of the mostly circular metal pipes should be slightly smaller than the diameter of the corresponding circular punched holes in the dynamo sheet. This is an attempt to create a good heat transfer between the laminated core and the coolant.
• Liquid cooling is preferably used when electrical machines are to be operated close to their power limit, ie the dissipated thermal power loss is comparatively high.
• the electrical connection capacity of such electrical machines is typically more than 5 kW.
• Liquid-cooled electrical machines are also quieter in operation because no fans are needed.
• the technical complexity of a liquid cooling compared to the air cooling is considerably larger.
• cooling tubes with a preferably circular cross section can be inserted into corresponding channels in the laminated core.
• cooling tubes, heat pipes or cool jets In order to cool a caseless electric machine with water, cooling tubes, heat pipes or cool jets must be routed through the laminated core of the stator, because the laminated core alone does not create a sufficient sealing effect. This lack of sealing effect can lead to significant malfunctions, especially in the direction of the winding system of the electrical machine. Between cooling tube and laminated core thus creates an air gap, which deteriorates the thermal connection of the cooling tube to the stator.
• Press-in operations of the cooling tubes are made in the cooling channels of the stator, or in that this air gap is filled with thermal paste or by impregnating resin to improve the thermal connection.
• a cooled stator for an electric machine in which a corrugated hose made of metal is arranged in the cooling channels to facilitate assembly.
• US 2004/0012272 A1 discloses an electrical machine in which metal tubes are pressed into half-open cooling channels on the side of the laminated core facing away from the winding system.
• the invention has for its object to provide a stator, in particular for a caseless electric machine, with which an efficient cooling device can be created. Another object of the invention is to provide a sufficient thermal connection of cooling pipes to a cooling channel. Furthermore, a suitable manufacturing method for such a stator and an electrical machine should be specified.
• the solution of the object is achieved by a stator, in particular for a caseless electric machine, which are in the stator substantially axially extending cooling channels, are used in the cooling tubes and at least partially means are present, the pressing of the cooling tubes via a deformation of the cooling channels to the cooling channel on the heat sources of the electric machine side facing creates.
• the cooling tubes are pressed by suitable means to the cooling channels of the stator. It is advantageously created by external targeted force this pressure.
• this pressure In particular, on the heat source side facing the cooling tube an efficient heat transfer is necessary, but by pressing on just this side leads to an extremely efficient heat transfer and thus to an excellent heat dissipation.
• the remote from the heat source portions of the cooling tubes by suitable means of the laminated core, in particular one or more bumps or a dent, are pressed against the heat source facing portions.
• the heat source is essentially the current heat losses of the winding, the iron losses and the eddy current losses.
• the side facing away from the heat source of the cooling tubes contribute to the heat dissipation even with thermally good connection only a comparatively small proportion.
• the laminated core of the stator does not have to rest against the cooling pipe in this section facing away from the heat source.
• the cavities that may be present in this section can be filled in with thermal grease or impregnating resin.
• Such bumps, knobs or dents on the individual sheets are relatively easy to produce by punching tools.
• the number of bumps, dents or nubs per cooling channel is not limited in the circumferential direction or in the axial direction; it should be made only a sufficient contact pressure of the cooling tubes in the region of the heat source side facing.
• the cooling efficiency is further increased by an additional deformation of the cooling tube by adapting the cooling tube to the shape of the cooling channel. This is not only a point contact but even a surface contact between the cooling tube and the cooling channel before.
• this principle can also be transferred from laminated stators to sintered stators.
• the cooling tubes located therein are preferably pressed against the cooling channel on the side facing the heat source by a deformation of at least the cooling channel.
• a deformation of the cooling tube through the bumps, knobs or dents etc. is brought about by the pressure, which leads to an optimal adaptation of the cooling channel and the cooling tube.
• stators are particularly suitable for all types of electrical machines, be it linear motors or rotary motors, regardless of their excitation, which can be done electrically or by permanent magnets.
• FIG. 1 shows a perspective view of a basic electric motor
• FIG 2 shows a cross-section of another motor
• FIG 3.4 shows a detailed view of a stator before and after the deformation of the cooling channels.
• FIG. 1 shows an electrical machine 1, which is designed without housing and which has a stator 2, which is composed of individual sheets 10.
• the stamped individual sheets 10 are stacked such that punched out, in particulardekanä- Ie, which are designed as a circular cooling channels 13 or as an oval cooling channels 3, arranged in the stacking sequence arranged axially extending cooling channels.
• FIG. 1 shows a sheet-metal rotor 22, which has been shrunk onto a shaft 20. 2 shows in a cross-section another housing-free electrical machine with cooling channels 13 present in the vertices of the stator 2, which form a cooling device arranged essentially around the grooves 5 of the stator 2. Furthermore, a rotor 22 is shown which has on its surface permanent magnets 11, which are preferably positioned and fixed on the rotor 22 by a bandage and / or an adhesive connection.
• FIG. 3 shows in a detailed illustration an electric machine 1 with grooves 5 and corners and / or on the surface existing cooling channels 3, 13.
• These cooling channels 3, 13 have in particular on the grooves 5, so the heat source
• On the opposite side at least one bump 8, nubs or indentation 9 on, but due to the design of the dynamo plate of the stator 2 still allows effortless axial insertion of cooling tubes 4, 6 o- 7 allowed.
• the cooling tubes 4, 6 or 7 can, as shown in principle have a variety of cross-sectional shapes.
• the cooling channels 3, 13 are not limited in their cross-sectional shape.
• a cooling jacket running meandering over the stator 2 is now formed by deflecting elements on the end sides of the stator 2.
• the deflecting elements can also be designed as deflecting chambers, wherein a deflecting chamber has at least one inflow and at least one outflow.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Motor Or Generator Cooling System (AREA)
• Iron Core Of Rotating Electric Machines (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=38983898

Family Applications (1)

Country Status (4)

Cited By (3)

Families Citing this family (46)

Citations (5)

Family Cites Families (19)

• 2006
  • 2006-09-22 DE DE102006044963A patent/DE102006044963B3/de not_active Expired - Fee Related
• 2007
  • 2007-09-20 JP JP2009528721A patent/JP5121833B2/ja not_active Expired - Fee Related
  • 2007-09-20 US US12/442,271 patent/US8072100B2/en not_active Expired - Fee Related
  • 2007-09-20 WO PCT/EP2007/059945 patent/WO2008034864A1/de not_active Ceased

Patent Citations (5)

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