GB2347561A - Die-cast cage rotor for electrical machines - Google Patents
Die-cast cage rotor for electrical machines Download PDFInfo
- Publication number
- GB2347561A GB2347561A GB0000439A GB0000439A GB2347561A GB 2347561 A GB2347561 A GB 2347561A GB 0000439 A GB0000439 A GB 0000439A GB 0000439 A GB0000439 A GB 0000439A GB 2347561 A GB2347561 A GB 2347561A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- rotor core
- cage
- cast
- die
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 125000006850 spacer group Chemical group 0.000 claims abstract description 38
- 238000003475 lamination Methods 0.000 claims abstract description 26
- 238000004804 winding Methods 0.000 claims abstract description 19
- 239000004020 conductor Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000004512 die casting Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000002153 concerted effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- H02K15/0012—Manufacturing cage rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Induction Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The die-cast cage rotor (1) is distinguished in that at the left and right end of its rotor core (6) between the laminated rotor core (3) and the short-circuiting rings (8, 9), spacer elements (10, 11) are also cast into the die-cast cage winding (7, 8, 9) so as to support the rings from the laminations. Projecting walls/studs 13 define an air gap between the rings and respective end laminations.
Description
2347561 Die-cast cage rotor for electrical machines and method for the
manufacture of the same.
The invention relates to a die-cast cage rotor for an electrical machine (or electric motor or generator), with a laminated rotor core arranged on a rotor shaft, the laminations of which laminated rotor core have holes which are superimposed in such a way that they form through-channels in the rotor core, and with a die-cast cage winding consisting of electroconductive material and applied to the rotor core, the die-cast cage winding consisting of conductor rods passing through the through-channels of the laminated rotor core and of short-circuiting rings (also known as cage rings or end rings) integrally moulded in one piece to the conductor rod ends at the end faces of the laminated rotor core. Moreover, the invention relates to a method for the manufacture of such a cage rotor.
DE 43 29 679 C2 discloses a cage rotor for electric motors, which can be manufactured using the die-cast method. First of all a cylindrical laminated rotor core is manufactured in that a plurality of laminations is superimposed and holes of the completely open type or the completely closed type are formed in them, in such a way that the holes of the laminations form through-holes in the core. The laminations are penetrated by a rotor shaft and are secured to the rotor shaft. Then conductive material in the form of aluminium or an aluminium alloy is sprayed into the cavities which are formed in the holes of the core, and into hollow regions of right and left end rings which are formed at both ends of the rotor core.
Subsequently, pressure casting with the conductive material is carried out, in order to mould the cage rotor. Finally, finishing of the right and left end rings and the outer circumferential parts of the core takes place, in order to complete the rotor.
A method for manufacturing a cage rotor, also disclosed in DE 43 29 679 C2, comprises steps in which a rotor core is manufactured. Firstly, a plurality of laminations, each of which has holes, is superimposed in such a way that the holes of the laminations form through-holes in the core, the plurality of laminations are secured to the shaft and an insulation layer is formed on the inner surface of each of the through holes. The rotor core is then securely braced together about a stationary mould, by use of a moving mould and die-casting of molten conductive material is carried out in order to form a rotor conductor in each of the through-holes and at the same time to form left and right end rings at the left and right end of the rotor core. The rings are formed in such a way that the rotor conductor and the left and right end rings are connected to each other in one piece; the movable mould, which is used when the rotor coreand the stationary mould are braced together, has outer press 2S moulds and an inner press mould, and an air outlet gap is formed in the movable mould between the inner press mould and each of the outer press moulds.
The manufacture of laminated rotor cores in aluminium die-cast technology with internally ventilated electrical machines has hitherto not been possible with a projection between the short-circuiting rings and the laminated core. The resulting problem is, on the one hand, a tendency towards cracking at the transition between the short-circuiting rings and the rotor rods and, on the other hand, a lack of ventilation of the rotor. In order to create the clearance from the laminated core, that is necessary for expansion compensation, the conventional copper winding technology with individually retracted rotor rods and soldered-on short-circuiting rings has hitherto always been used.
In contrast, it is desirable to solve or ameliorate at least one of these problems with a die-cast cage rotor of the type mentioned in the introduction.
The invention is defined in the independent claims, to which reference should now be made. Further, advantageous features can be found in the dependent claims.
In accordance with an embodiment of the invention, at least one spacer element of a die-cast cage rotor is also cast into the die-cast cage winding at one end and preferably at both ends, i.e. the left and right end of the rotor core between the laminated rotor core and the short-circuiting rings. A method for the manufacture of such a die-cast cage rotor in accordance with an embodiment of the invention is characterized in that a rotor core is manufactured from a rotor shaft and from laminations, these laminations being combined to form a laminated rotor core, with holes superimposed to form through-channels or through-holes and also in that, spacer elements supported against the laminated rotor core are arranged on the end faces of the rotor core, and in that during die-casting of the electroconductive cage winding, which is formed in one piece from the conductor rods and the short-circuiting rings, the spacer elements are also cast into the cage rotor between the short-circuiting rings and the laminated rotor core.
To achieve an expansion area between the short circuiting rings and the laminated rotor core during operation of the cage rotor a spacer element or spacing disc, which is cast or otherwise manufactured preferably with spacer sleeves (one per winding groove or winding in each through-hole) may be inserted during casting. The sleeves may be, for example, cast on or connected by using lasers and spot-welding. The material of the spacer elements or spacing discs may be selected to have the same expansion coefficient as the material for the short-circuiting rings in order not to generate any shearing stresses during operation.
Developments of the die-cast cage rotor in accordance with the invention are characterized in the dependent claims. The cage rotor in accordance with the invention is suitable in particular for high-voltage and low-voltage motors and for path drives. Particular advantages of embodiments of the invention are that by way of the spacer elements which can be cast in and which count as dead moulded parts, on the one hand an absorption of the casting pressure takes place during the manufacture of the rotor, on the other hand sealing of the casting mould by the inserted spacing discs is possible. Moreover no finishing of the dead moulded part (spacing disc) is necessary and, finally, compensation of the bending and shearing stresses between the short-circuiting rings and the laminated rotor core results during operation.
Furthermore, the die-cast cage rotor in accordance with the invention has the advantage that the spacer elements may have a ventilating effect for the internal cooling circuit of the cage rotor. A concerted or purposeful accumulation of material in endangered areas allows compensation of blowhole formation in the short- circuiting rings. Appropriate shaping of the spacer elements or spacing discs which are to be inserted, on the one hand may result in a formation of the supporting bar outer contour which is favourable in terms of flow as well as freely selectable transition radii between the short-circuiting rings and the rotor rods. Finally, the insertable spacer elements may replace additional end laminations on the laminated rotor core.
Further advantages and details of the invention are evident from the following description of the exemplary embodiments with reference to the drawings and in connection with the claims.
Figure 1 shows a design of a die-cast cage rotor in accordance with the invention in longitudinal section.
Figure 2 shows a partial section A-A according to Figure 1, with a partial top view of a lamination design.
The die-cast cage rotor 1 in accordance with the invention, shown in the exemplary embodiment, consists of a preferably substantially cylindrical laminated rotor core 3 secured to a rotor shaft 2, the laminated rotor core being formed from a plurality of laminations 4 (dynamo laminations) that are preferably perpendicular to the rotational axis. In the disc shaped laminations 4 preferably axially extending holes are provided which are distributed over the circumference and closed or open (i.e. grooves) on the side of the circumference, with the holes 5 of the laminations 4 being superimposed in such a way that in the formed rotor core 6 through-channels are produced.
Moreover, the laminations 4 have cooling bores 151 for the formation of cooling channels 15 extending axially through the rotor core.
To install the die-cast cage winding consisting of rotor rods 7 and shortcircuiting rings 8, 9 arranged on the end of the rotor core 6, the rotor core 6 is inserted into a die-cast device which is not represented. Spacer elements 10, 11 are also inserted 10 and positioned on the end face of the rotor core, the spacer elements forming so-called dead moulded parts after the die-casting. During the die-casting, molten, electroconductive material, for example copper or a copper alloy or aluminium or an aluminium alloy, is 15 poured into the die-cast mould, whereby the flowing die-cast material fills the through-channels, formed by the holes 5 of the laminations 4, for the purpose of forming the rotor rods 7 of the winding, and fills end hollow areas for the purpose of forming the short20 circuiting rings 8, 9 of the winding to form a onepart die-cast winding. These end hollow areas are preferably positioned axially outside the spacer elements at either end of the rotor core. 25 The spacer elements 10, 11 are preferably constructed as disc rings or rings, which have connection openings 12 to the through-channels of the rotor core 6 for the rotor rods 7. Furthermore, the spacer elements 10, 11 may have spacer bars, spacer sleeves 13 or suchlike in 30 the region of the winding grooves (or through-holes) of the rotor core 6. These may be integrally formed with the spacer elements. The transition radius between the conductor rods 7 and the short-circuiting rings 8, 9 can thus be determined by way of the outer contour 14 35 of the spacer elements 10, 11, possibly including the spacer bars or sleeves.
List of reference numerals 1 die-cast cage rotor 2 rotor shaft 3 laminated rotor core 4 laminations holes in the laminations 6 rotor core 7 conductor rods 8 short-circuiting ring 9 short-circuiting ring spacer element 11 spacer element 12 connection openings in the spacer elements 13 spacer bars, spacer sleeves 14 outer contour of 10, 11 cooling channels of the laminated rotor core 151 cooling bore of the lamination
Claims (9)
1. Die-cast cage rotor (1) for an electrical machine, with a laminated rotor core (3) arranged on a rotor shaft (2), the laminations (4) of which laminated rotor core have holes (5) which are superimposed in such a way that they form through-channels in the rotor core (6), and with a die-cast cage winding consisting of electroconductive material and applied to the rotor core, the die-cast cage winding consisting of conductor rods (7) passing through the through- channels of the laminated rotor core and of short-circuiting rings (8, 9) integrally moulded in one piece to the conductor rod ends at the end faces of the laminated rotor core, wherein at the lef t and right end of the rotor core (6) between the laminated rotor core (3) and the short circuiting rings (8, 9), spacer elements (10, 11) are also cast into the die-cast cage winding (7, 8, 9)
2. Cage rotor according to claim 1, in which the spacer elements (10, 11) replace end laminations at the laminated rotor cores.
3. Cage rotor according to claim 1 or 2, in which the spacer elements (10, 11) consist of a material which has the same or a comparable expansion coefficient as the material of the die-cast cage winding (7, 8, 9)
4. Cage rotor according to any of the preceding claims, in which the spacer elements (10, 11) are constructed as disc rings which have connection openings (12) to the through-channels of the rotor core (6) for the rotor rods (7).
5. Cage rotor according to any of the preceding claims, in which the spacer elements (10, 11) comprise spacer bars, spacer sleeves (13) or other projections in the region of the winding grooves or through-holes of the rotor core (6).
6. Cage rotor according to any of the preceding claims, in which the spacer elements (10, 11) consist of cast or punched rings with integrally moulded or welded-on spacer sleeves (13).
7. Cage rotor according to any of the preceding claims, in which the transition radius between the conductor rods (7) and the short-circuiting rings (8, 9) is determined by way of the outer contour (14) of the spacer elements (10, 11).
8. Method for the manufacture of a cage rotor according to one or more of claims 1 to 7, in which a rotor core (6) is manufactured from laminations (4), which are combined to form a laminated rotor core (3), with holes (5) in the laminations superimposed to form through-channels, and from a rotor shaft (2), spacer elements (10, 11) supported against the laminated rotor core (3) are arranged at the end faces the rotor core (6) further comprising die-casting of the cage winding formed in one piece from the conductor rods (7) and the short circuiting rings (8, 9) and consisting of electroconductive material, the spacer elements being also cast into the cage rotor (1) between the short-circuiting rings and the laminated rotor core.
9. A cage rotor and a method of manufacture thereof substantially according to the embodiment shown in the drawings and described in the description.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19901195A DE19901195A1 (en) | 1999-01-14 | 1999-01-14 | Electrical machine die-cast cage rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0000439D0 GB0000439D0 (en) | 2000-03-01 |
| GB2347561A true GB2347561A (en) | 2000-09-06 |
Family
ID=7894240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0000439A Withdrawn GB2347561A (en) | 1999-01-14 | 2000-01-10 | Die-cast cage rotor for electrical machines |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE19901195A1 (en) |
| FR (1) | FR2788637B1 (en) |
| GB (1) | GB2347561A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10309161A1 (en) * | 2003-02-28 | 2004-09-16 | Siemens Ag | Electrical machine with a laminated rotor |
| DE10350171A1 (en) * | 2003-10-28 | 2005-06-02 | Siemens Ag | Squirrel cage armature for a single-phase motor or a three-phase asynchronous motor has side walls of slots insulated compared with conductors/windings/winding rods |
| EP2288004B1 (en) * | 2009-08-19 | 2017-05-17 | Siemens Aktiengesellschaft | Cage rotor with start-up rod |
| EP2744089A1 (en) | 2012-12-14 | 2014-06-18 | Siemens Aktiengesellschaft | Reliable cage rotor |
| CN107612167A (en) * | 2017-09-28 | 2018-01-19 | 浙江兴轮电驱动有限公司 | Rotor and motor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB921669A (en) * | 1961-02-23 | 1963-03-20 | Ass Elect Ind | Improvements in and relating to squirrel cage motors |
| EP0642208A1 (en) * | 1993-02-18 | 1995-03-08 | Fanuc Ltd. | Method for manufacturing cage rotor for induction motor |
| EP0786855A1 (en) * | 1995-07-13 | 1997-07-30 | Fanuc Ltd | Cage rotor |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB561658A (en) * | 1942-11-27 | 1944-05-30 | Benno Schwarz | Improvements connected with the construction of rotors for electric induction motors |
| IL82685A0 (en) * | 1987-05-27 | 1987-11-30 | Manuel M Werber | Improvement in electric motors |
| JPH0366561U (en) * | 1989-10-30 | 1991-06-27 | ||
| JP2692507B2 (en) * | 1992-09-03 | 1997-12-17 | 日立工機株式会社 | Squirrel cage rotor manufacturing equipment |
| DE19729432C1 (en) * | 1997-07-09 | 1999-01-14 | Siemens Ag | Short-circuit rotor for asynchronous machine |
-
1999
- 1999-01-14 DE DE19901195A patent/DE19901195A1/en not_active Withdrawn
-
2000
- 2000-01-07 FR FR0000167A patent/FR2788637B1/en not_active Expired - Fee Related
- 2000-01-10 GB GB0000439A patent/GB2347561A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB921669A (en) * | 1961-02-23 | 1963-03-20 | Ass Elect Ind | Improvements in and relating to squirrel cage motors |
| EP0642208A1 (en) * | 1993-02-18 | 1995-03-08 | Fanuc Ltd. | Method for manufacturing cage rotor for induction motor |
| EP0786855A1 (en) * | 1995-07-13 | 1997-07-30 | Fanuc Ltd | Cage rotor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0000439D0 (en) | 2000-03-01 |
| FR2788637B1 (en) | 2006-08-04 |
| DE19901195A1 (en) | 2000-07-27 |
| FR2788637A1 (en) | 2000-07-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |