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
  • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles

Definitions

• the invention relates to a main element for an electrical machine according to the preamble of claim 1.
• the magnetically conductive body is composed of two laminated cores which are layered from individual sheet metal blanks.
• a sheet metal blank has a receiving opening for the rotor with an opening edge, over the circumference of which a number of dovetail-like grooves are formed equidistantly. These sheet metal blanks are placed axially against one another and packaged to form a hollow cylindrical yoke.
• Another sheet metal blank has a tooth bridge with a dovetail-like tooth base and a tooth head or shoe protruding over the tooth bridge. These sheet metal blanks are packaged into tooth sections of axial teeth.
• a third sheet metal blank has a number of the same arranged in a star shape corresponding to the number of joining grooves Toothed webs with dovetail-like tooth bases and tooth heads or shoes, the tooth heads or shoes of which are connected to one another via thin webs which extend in the circumferential direction.
• the tooth sections are packaged, such sheet metal blanks are placed at an axial distance into the tooth pack and arranged on the two outer end faces of the tooth pack.
• the punch package of the teeth known as the stator star, is given a stable shape.
• the stator winding of the known stator has a number of elongated ring coils corresponding to the number of teeth, which are wound onto the bobbin and pushed radially onto the teeth of the stator star. Then the stator yoke is placed on the end face of the stator star provided with the stator winding and the tooth bases of the teeth in the stator star are positively inserted into the joining grooves in the yoke.
• stator star Packing the stator star tight tolerances with regard to the clear internal dimensions of the toroid, the so-called window of the ring coils and the package height of the stator star are observed.
• the main element according to the invention for an electrical machine with the features of claim 1 has the advantage that the compensation mask attached with at least one, preferably on both end faces of the magnetically conductive body, which with its compensation elements
• the toroidal coils are fixed axially immovable on the teeth without having to maintain close tolerances between the window dimensions of the toroidal coils and the package height of the magnetically conductive body.
• the tolerance compensation for a tight fit of the ring coils on the teeth takes place through the spring travel of the axially elastically deforming compensating elements, which are more or less axially compressed when the ring coils are fitted.
• the compensating elements simultaneously provide electrical insulation of the coil heads of the ring coils from the teeth and protect the ring coils against mechanical damage from the tooth edges.
• parallel ribs are formed on the outer surface of the compensating elements facing away from the tooth, said ribs being arranged one above the other in the radial direction of the teeth.
• the ring element that is associated with the teeth is associated with the teeth
• Compensating elements to form a compensating mask formed by a preferably thin-walled ring sleeve, from the outer wall of which the compensating elements protrude in a star shape.
• the ring sleeve has a protruding section projecting axially beyond the compensating elements
• Ring coils placed on the teeth cover the underside of the coil heads of the ring coils. This protruding section increases the stability of the winding in the area of the coil ends.
• an insulating strip is inserted between the mutually facing longitudinal sides of the teeth on the one hand and the inner longitudinal sides facing them of the ring coils pushed onto the teeth, whereby complete electrical insulation between ring coils and teeth is achieved.
• the insulating strips are preferably on the mutually facing inner longitudinal sides of the ring coils attached, in particular glued, and are thereby automatically positioned when the ring coils are mounted on the teeth.
• the insulating strips on the outwardly facing upper side of the ring coil are angled to cover them, so that the ring coils are also electrically insulated from a hollow cylindrical yoke which is later pushed onto the free outer surface of the teeth.
• 1 is a perspective view of a compensation mask in plan view
• FIG. 2 is a perspective view of a stator star of a stator with compensation masks placed on both end faces
• FIG. 3 shows the same representation as in FIG. 2 with ring coils placed on some teeth
• FIG. 4 is an enlarged view of section IV in FIG. 3 in plan view
• Fig. 5 is a perspective view of an assembled stator.
• the stator 10 (FIG. 5) has a magnetically conductive body, referred to as the stator body 11, which, in a known manner, consists of a plurality of laminations made up of a laminated core, and a stator winding 12.
• the stator body 11 is divided and composed of a so-called stator star 13 and a hollow-cylindrical yoke 14 surrounding the stator star 13 on the outside, both the stator star 13 and the yoke 14 being packaged as sheet metal laminations lying against one another Sheet metal packages are executed.
• the stator star 13 has a plurality of radially aligned teeth 15 arranged in a star shape and extending in the longitudinal direction, on whose inwardly facing ends in the circumferential direction protruding tooth shoes 151 are formed on both sides of the tooth 15.
• the toothed shoes 151 of a total of nine teeth 15 in the exemplary embodiment are connected to one another via radially narrow webs 16.
• a sheet metal blank or a lamella of the stator star 13 thus consists of nine teeth 15 with tooth shoes 151 formed thereon and nine webs 16 which are integral with the
• Toothed shoes 151 are connected. According to the desired axial length or package height of the stator star 13 packaged a corresponding number of sheet metal blanks to the stator star 13, the stator star 13 having a tolerance range of approximately 1.5 sheet thicknesses in the package height.
• the stator winding 12 consists of interconnected, elongated, oval ring coils 17, which are wound as coil-less air coils separately from the stator body 11 in a winding machine. In each case one ring coil 17 is placed radially on a tooth 15, so that the number of ring coils 17 corresponds to the number of teeth 15, that is to say nine in the exemplary embodiment.
• the toroidal coils 17 are fixed axially and radially immovably on the teeth 15 and that there is no play in this direction that would cause mechanical stress on the stator 10.
• a compensation mask 18 made of electrically insulating material which is shown in perspective in FIG. 1, is attached to each end face of the stator star 13.
• Each compensation mask 18 has a number of compensation elements 20 corresponding to the number of teeth, which are elastically deformable in the axial direction of the teeth 15, and one the compensating elements 20 interconnecting, closed ring element 19. Ring element 19 and compensating elements 20 are in one piece
• Each compensating element 20 has approximately a U-shape with a roof-shaped transverse web 201 and two U-legs 202 which continue in one piece from the transverse web 201.
• the ring element 19 is designed as a thin-walled annular sleeve 21, from the outer wall of which the U-shaped compensating elements 20 protrude in a star shape the annular sleeve 21 has a protruding section 211 projecting axially beyond the radially oriented transverse webs 201 of the compensating element 20.
• a compensating element 20 is placed on a tooth 15, so that the front end of the tooth 15 is spanned by the roof-shaped transverse web 201 and the short U-legs 202 are on the two long sides facing away from one another Slide on 152 of teeth 15.
• FIG. 4 in the case of compensating elements 20 placed on the teeth 15, there is a spring travel s between the end face 153 of the tooth 15 and the roof-shaped transverse web 201 of the compensating element 20, about which the compensating element 20 is pressed in elastically in the axial direction of the teeth 15 can be.
• This spring travel s determines the tolerance range which the compensation mask 18 is able to compensate with respect to the length of the teeth 15, that is to say the package height of the stator star 13.
• parallel ribs 22 are formed, which are arranged one above the other in the radial direction at a distance from one another.
• Ribs 22 are integrally formed from the roof-shaped crosspiece 201. After the two compensating masks 18 have been placed on the stator star 13, the individual toroidal coils 17 are pushed radially onto the teeth 15, the crossbars 201 of the compensating elements 20 being depending on the tolerances between the axial length of the teeth 15 and the clear length of the coil window of the toroidal coils 17 Coil heads 171 are pressed more or less towards the front end 153 of the teeth 15. Due to the spring restoring force of the compensating elements 20, the ring coils 17 are non-positively and axially without play on the teeth 15.
• the coil heads 171 of the ring coils 17 lie on the projecting section 211 of FIG Ring sleeve 21, which contributes to increased stability of the stator winding 12.
• an insulating strip 23 is inserted between the mutually facing longitudinal sides 152 of the teeth 15 on the one hand and the inner longitudinal sides of the ring coils 17 pushed onto the teeth 15, as shown in FIGS. 4 is indicated.
• the insulating strips 23 are facing each other
• Inner longitudinal sides of the ring coils 17 attached, preferably glued, so that they are automatically correctly positioned when the ring coil 17 is placed on the teeth 15.
• the insulating strips 23 are angled at the exit point from the ring coil 17 and cover the outwardly facing upper sides of the ring coils 17.
• the hollow-cylindrical yoke 14 is axially pushed onto the stator star 13 thus provided with ring coils 17, the tooth surfaces 154 pointing radially outward abutting the inner wall of the yoke 14 in a form-fitting manner. Due to the insulating strips 23 protruding over the upper sides of the ring coils 17, the ring coils 17 are also electrically insulated from the yoke 14.
• the invention is not limited to the main element for an electrical machine described as a stator.
• the main element as a rotor e.g. a DC motor with an external rotor.

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Insulation, Fastening Of Motor, Generator Windings (AREA)
• Iron Core Of Rotating Electric Machines (AREA)
• Manufacture Of Motors, Generators (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34877504

Family Applications (1)

Country Status (7)

Cited By (6)

Families Citing this family (16)

Citations (7)

Family Cites Families (13)

• 2004
  • 2004-03-06 DE DE102004011094A patent/DE102004011094A1/de not_active Withdrawn
• 2005
  • 2005-01-31 ES ES05707889T patent/ES2339362T3/es not_active Expired - Lifetime
  • 2005-01-31 WO PCT/EP2005/050381 patent/WO2005086319A1/de not_active Ceased
  • 2005-01-31 DE DE502005008948T patent/DE502005008948D1/de not_active Expired - Lifetime
  • 2005-01-31 US US10/591,861 patent/US20070194653A1/en not_active Abandoned
  • 2005-01-31 EP EP05707889A patent/EP1726078B1/de not_active Expired - Lifetime
  • 2005-01-31 JP JP2007501259A patent/JP4358883B2/ja not_active Expired - Fee Related
• 2007
  • 2007-06-25 GB GBGB0712352.4A patent/GB0712352D0/en not_active Ceased

Patent Citations (7)

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