WO2001037408A1 - Commutator machine with flexible risers - Google Patents
Commutator machine with flexible risers Download PDFInfo
- Publication number
- WO2001037408A1 WO2001037408A1 PCT/CA2000/001322 CA0001322W WO0137408A1 WO 2001037408 A1 WO2001037408 A1 WO 2001037408A1 CA 0001322 W CA0001322 W CA 0001322W WO 0137408 A1 WO0137408 A1 WO 0137408A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weld
- commutator
- accordance
- riser
- attaching
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/04—Connections between commutator segments and windings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/32—Connections of conductor to commutator segment
Definitions
- This invention relates generally to dynamoelectric machines and, more particularly, to commutator risers for dynamoelectric machines.
- Known commutated DC dynamoelectric machines typically include a motor housing, a stator, and a rotor assembly.
- the stator includes a magnet frame and a plurality of field poles including a bore extending therethrough.
- the rotor assembly is rotatably mounted in the housing, extends through the stator bore, and includes an armature core and a rotor shaft extending through the core.
- the armature core includes a plurality of slots wherein armature coils are wound.
- the rotor shaft includes a commutator and a plurality of radially arranged commutator risers.
- the commutator includes a plurality of commutator bars.
- the risers typically are copper strips with an inner end and an outer end.
- Each copper strip is welded or brazed to a commutator bar at the inner end and welded or brazed to an armature coil at the outer end.
- the inner weld is fabricated by welding or brazing with a silver- phosphorus alloy.
- the riser strips are subjected to mechanical, magnetic and centrifugal forces that sometimes produce fractures or fatigue cracks that can lead to a machine breakdown.
- a rotor for a dynamoelectric machine includes a rotor shaft, a commutator, an armature, and a plurality of risers.
- the commutator includes a plurality of commutator bars and a plurality of insulator segments arranged alternately with each other in a circumferential direction of the rotor shaft.
- the armature carries a plurality of armature coils extending in an axial direction along the armature.
- the armature coils include end windings.
- the risers are secured to outer ends of corresponding commutator bars and extend longitudinally in a radial direction of the rotor shaft. Each riser includes an opening therethrough and is connected to a corresponding end winding such that each armature coil is electrically connected to a corresponding commutator bar.
- Figure 1 is a side view of a prior art rotor assembly
- Figure 2 is a side view of a flexible riser assembly in accordance with one embodiment of the present invention.
- Figure 3 is a cross sectional view of a motor including the flexible riser assembly shown in Figure 2.
- FIG. 1 is a side view of a prior art rotor assembly 10 including a rotor shaft 12 with a commutator support 14 and an armature core 16 mounted thereon.
- a commutator bar 18 is mounted on commutator support 14 opposite rotor shaft 12.
- Commutator bar 18 includes a bar extension 19 including a slot 21.
- Rotor assembly 10 further includes a riser 20 that is inserted into slot 21 and attached to commutator bar 18 by bottom welds 22 typically provided by Tungsten inert gas brazing with a silver phosphorus alloy.
- Armature core 16 extends radially from rotor shaft 12 and forms a plurality of alternating slots (not shown) and teeth 24 around the periphery of armature core 16.
- a plurality of armature coils (not shown) are wound in the slots and include end windings 26 protruding therefrom. End windings 26 are connected to riser 20 at a top weld 28.
- Riser 20 includes a width 30 defined by a first edge 32 and a second edge 34 substantially parallel to first edge 32.
- Riser 20 further includes a height 36.
- rotor shaft 12 bends producing one per revolution cyclic relative axial deflections between top weld 28 and armature core 16. Since end windings 26 are attached substantially inflexibly to teeth 24, which are integral with core 16, and core 16 itself, which, in turn, is attached substantially inflexibly to rotor shaft 12, at least a portion of the relative axial displacement is imposed on riser 20. Accordingly, an edge-wise bending of riser 20 occurs due to the one per revolution cyclic relative axial deflections.
- riser assembly 10 is typically utilized in highly transient duty cycle applications and a high electrical current energizes the armature coil associated with end windings 26 for brief periods of time. Since a thermal time constant of the armature coil is substantially less than the thermal time constants of armature core 16 and rotor shaft 12, an axial displacement occurs. As explained above regarding inflexibility, at least a portion of the axial displacement is absorbed by riser 20 producing an edge- wise bending of riser 20.
- An additional cause of edge-wise bending is a centrifugal force on riser 20 during operation of a motor (not shown) including riser assembly 10.
- a centrifugal force on riser 20 during operation of a motor (not shown) including riser assembly 10.
- end windings 26 experience a centrifugal force radially outwards and, since end windings 26 are attached only to riser 20 at top weld 28, the centrifugal force is transmitted to riser 20 producing an edge- wise bending of riser 20.
- a stress in riser 20 resulting from a fixed edge-wise bending displacement is a function of height 36 and width 30 of riser 20. Given an equal axial displacement, a taller riser is stressed less than a shorter riser is stressed. If height 36 is relatively large, as is the case in large diameter DC machines, a corresponding riser stress is less than a corresponding ⁇ ser stress m shorter ⁇ sers with the same axial displacement However, lengthening height 36 is usually not a viable solution for DC machines with relatively small diameters
- the stress in riser 20 is also a function of riser width 30 Given a fixed axial displacement, a shorter width 30 results in a lower stress level since the stress is inversely proportional with the width Although a shortening of riser width 30 will reduce stress due to axial displacement caused by the relative thermal expansion and the one per revolution cyclic relative axial deflections, the shortening will increase stress due to the cent ⁇ fugal radial force transmitted to ⁇ ser 20 by end windings 26
- decreasing width 30 may not reduce fatigue cracks in ⁇ ser 20
- Figure 2 shows a rotor 37 with a flexible ⁇ ser assembly 38 including a rotor shaft 40 with a commutator support 42 and an armature core 44 mounted thereon
- a commutator bar 46 is mounted to commutator support 42 opposite rotor shaft 40
- Commutator bar 46 includes a bar extension 43 including a slot 45
- Flexible riser assembly 38 further includes a flexible ⁇ ser 48 including a riser top 50 and a ⁇ ser bottom 52 attached to commutator bar 46 by a plurality of bottom welds or brazings 54
- Armature core 44 extends radially from rotor shaft 40 and forms a plurality of alternating slots (not shown) and teeth 56 around the periphery of armature core 54
- a plurality of armature coils are wound in the slots and include end windings 58 protruding therefrom End windings 58 are connected to flexible riser 48 at a top weld 60
- Flexible ⁇ ser 48 includes a first width 62 defined by a first edge 64 and a second edge 66 parallel to first edge 64
- Flexible ⁇ ser 48 further includes a second width 68 defined by first edge 64 and a third edge 70
- Flexible nser 48 still further includes a third width 72 defined by second edge 66 and a fourth edge 74
- An opening 76 extends through ⁇ ser 48 between third edge 70 and fourth edge 74
- third width 72 is substantially equal to second width 68
- opening 76 is substantially centered on flexible riser 48
- opening 76 is elongated radially
- opening 76 is substantially oval It is contemplated that the benefits of flexible riser 48 accrue to all ⁇ sers with openings, including, but not limited to, openings with at least one line of
- First width 62 is equal to width 30 (shown in Figure 1) and opening 76 provides an effective width of less than one-half width 30 for flexible ⁇ ser 48
- the width 61 - opening 16 . , , , , _ , , detergent ⁇ effective width is — , which is less than one-half width 30 As
- flexible ⁇ ser 48 includes a second opening (not shown) and stress is reduced by a factor greater than three It is contemplated that flexible riser 48 includes any desired number of openings to obtain any co ⁇ espondmg reduction in stress
- Opening 76 can be any desired length to achieve any desired flexibility
- opening 76 extends between top weld 60 and at least one bottom weld 54
- opening 76 extends approximately between ⁇ ser top 50 and ⁇ ser bottom 52
- Riser 48 is fab ⁇ cated from sheet stock and opening 76 is stamped or punched
- opening 76 can be machined with a cutting tool
- FIG. 3 is a cross sectional view of a motor 78 including flexible riser 48
- Motor 78 includes a housing 80, a stator assembly 82, a rotor assembly 84, and a commutator assembly 86
- Stator assembly 82 is located within housing 80 and includes a stator core 88 including a stator bore 90 for receiving rotor assembly 84
- Stator core 88 further includes a plurality of wound field poles 92
- Rotor assembly 84 includes rotor shaft 40 carrying commutator assembly 86 and armature core 56 including a plurality of end windings 58
- Commutator assembly 86 includes a plurality of commutator bars 46, a brush holder 94 including a plurality of brushes (not shown), and a plurality of flexible ⁇ sers 48
- Each flexible ⁇ ser 48 is attached to a respective commutator bar 46 by at least one bottom weld 54 and attached to a respective end winding 58 with a top weld 60
- flexible ⁇ ser 48 has an effective width of less than one-half width 62 (shown in Figure 2) and, accordingly, stress is reduced by a factor greater than two, as explained above
- stress is reduced by a factor greater than two, as explained above
- fatigue strength is improved which reduces fatigue cracks
- fatigue cracks in commutator ⁇ sers near an inner weld are reduced
- the benefits of a flexible riser assembly 38 accrue to all types of commutated motors, such as, for example, but not limited to, motors with ⁇ sers of substantial height and motors with bent ⁇ sers
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001537852A JP2003514501A (en) | 1999-11-12 | 2000-11-10 | Flexible commutator riser |
EP00974223A EP1151521A1 (en) | 1999-11-12 | 2000-11-10 | Commutator machine with flexible risers |
AU12624/01A AU1262401A (en) | 1999-11-12 | 2000-11-10 | Commutator machine with flexible risers |
BR0007493-4A BR0007493A (en) | 1999-11-12 | 2000-11-10 | Collector machine with flexible conductors |
HU0105040A HUP0105040A3 (en) | 1999-11-12 | 2000-11-10 | A method for assembling of rotor with commutator flexible risers, rotor and dinamoelectric machine carrying out in this way |
CA002356948A CA2356948C (en) | 1999-11-12 | 2000-11-10 | Flexible commutator riser |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US16522099P | 1999-11-12 | 1999-11-12 | |
US60/165,220 | 1999-11-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001037408A1 true WO2001037408A1 (en) | 2001-05-25 |
Family
ID=22597971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CA2000/001322 WO2001037408A1 (en) | 1999-11-12 | 2000-11-10 | Commutator machine with flexible risers |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP1151521A1 (en) |
JP (1) | JP2003514501A (en) |
CN (1) | CN1338143A (en) |
AU (1) | AU1262401A (en) |
BR (1) | BR0007493A (en) |
CA (1) | CA2356948C (en) |
HU (1) | HUP0105040A3 (en) |
WO (1) | WO2001037408A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113890225B (en) * | 2021-09-12 | 2023-01-10 | 超音速智能技术(杭州)有限公司 | Permanent magnet synchronous motor and motor rotor |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE99145C (en) * | ||||
US3422213A (en) * | 1966-04-21 | 1969-01-14 | Webb James E | Connector strips |
US5039896A (en) * | 1989-12-20 | 1991-08-13 | General Electric Company | Main field coil connector with high cyclic duty capability |
-
2000
- 2000-11-10 WO PCT/CA2000/001322 patent/WO2001037408A1/en not_active Application Discontinuation
- 2000-11-10 CA CA002356948A patent/CA2356948C/en not_active Expired - Fee Related
- 2000-11-10 CN CN00802690.4A patent/CN1338143A/en active Pending
- 2000-11-10 EP EP00974223A patent/EP1151521A1/en not_active Withdrawn
- 2000-11-10 BR BR0007493-4A patent/BR0007493A/en not_active Application Discontinuation
- 2000-11-10 HU HU0105040A patent/HUP0105040A3/en unknown
- 2000-11-10 AU AU12624/01A patent/AU1262401A/en not_active Abandoned
- 2000-11-10 JP JP2001537852A patent/JP2003514501A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE99145C (en) * | ||||
US3422213A (en) * | 1966-04-21 | 1969-01-14 | Webb James E | Connector strips |
US5039896A (en) * | 1989-12-20 | 1991-08-13 | General Electric Company | Main field coil connector with high cyclic duty capability |
Also Published As
Publication number | Publication date |
---|---|
AU1262401A (en) | 2001-05-30 |
CN1338143A (en) | 2002-02-27 |
EP1151521A1 (en) | 2001-11-07 |
BR0007493A (en) | 2001-10-16 |
CA2356948A1 (en) | 2001-05-25 |
HUP0105040A3 (en) | 2002-10-28 |
HUP0105040A2 (en) | 2002-04-29 |
CA2356948C (en) | 2009-03-17 |
JP2003514501A (en) | 2003-04-15 |
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