Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K3/00—Details of windings
  • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
  • H02K3/28—Layout of windings or of connections between windings

Definitions

• the invention relates to a three-phase motor of large diameter with a stator having parting lines, which carries a stator winding formed from coils in two layers arranged in slots and switching connections which extend over the circumference.
• Stands of this type which can be divided, of large-scale three-phase motors, in particular of a synchronous type, are known.
• the coils of the stator windings and also the switching connections each bridge the parting line. This complicates the assembly of the three-phase motor at the installation site, since in general the joint coils have been removed from the machine after the test and are only reinserted at the installation site, so that they are again there with the rest of the winding and the switching connections, in particular by soldering need to be connected.
• a detachable screw connection of the coils and switching connections in the area of the parting joint avoids the soldering at the installation site, but requires a lot of space and is very complicated in terms of construction.
• the invention has for its object to provide a three-phase motor of synchronous or asynchronous type with a divisible stand, which can be easily installed on site.
• the stator winding is subdivided into a plurality of areas of closed coils corresponding to the number of part joints, which are only in the grooves located between the part joints.
• the joints are not covered by coils. Only the switching connections are guided over the parting line and can be connected to one another there, in a known manner in particular detachably. In a three-phase motor designed in this way, the grooves of the stator that are adjacent to the parting joint are each occupied only in one layer.
• This single-layer arrangement of the coil sides in the grooves adjacent to the parting joint changes the armature reaction there. It is therefore advantageous that the air gap is enlarged in the grooves adjacent to the parting joint and only occupied by one coil side. This at least partially compensates for the lack of anchor reaction in this area.
• the enlargement of the air gap in the vicinity of the parting line can be constant or can increase steadily or in stages towards the parting line. In this way, certain force waves magnetically excited by the locally lacking armature reaction can be influenced.
• stator winding of this type which leaves the parting lines free, in three-phase motors which are fed with variable frequencies, because the magnetic force effects can be minimized by the free choice of the number of pole pairs additionally given for the dimensioning of the machine .
• stator winding be mechanically stiffened with filler pieces with which the. only one-layer stud grooves are filled.
• FIG. 1 shows a section of the circuit diagram of the stator winding of a three-phase motor with parting lines.
• Fig. 2 shows a part of a radial section through the
• a three-phase motor of large diameter is designed as an external rotor motor and is operated at a variable speed, e.g. B. operated by frequency converter.
• the inner stand 1 is layered from uniformly grooved sheet metal segments 2.
• the coils 4 of the stator winding 5 each lie in the grooves 3 of the sheet metal segments 2. Since the three-phase motor has a large diameter, the stator 1 is designed to be divisible, that is to say it has a plurality of part joints 6 (only indicated by dashed lines in FIG. 1) .
• the stator winding 5 is divided into several regions 7 indicated by arrows in FIG. 1, each of which extends between the parting lines 6. In each of these areas 7, the stator winding 5 contains a certain number of closed coils 4, which lie only in the grooves 3 located between the parting lines 6. As a result, the parting line 6 is not bridged by coils 4 of the stator winding 5.
• stator 1 Only the arranged on the end faces of the stator 1, extending over the circumference switching connections 11 with which the individual coils 4 are connected several times in parallel and in series in accordance with the structure of the stator winding 5 are guided over the parting line 6 and have releasable there Connections so that they can be reassembled at the installation site of the machine.
• the rotor of the three-phase motor of the synchronous type which is arranged outside the stator, bears several solid poles 12, which each carry excitation windings 13. Between the poles 12 and the sheet metal segments 2 in the area of the grooves 3 filled with two layers of the coil sides 8 " the air gap 14 indicated by arrows in FIG. 2 has the normal height resulting from the dimensioning of the three-phase motor. In the area only half with However, an enlarged air gap 15, which is also indicated by arrows, is located on a spool side 8, which lies adjacent to the parting line 6. This optimizes the armature reaction missing in this area, adjacent to the parting line 6 as a result of the only single-layer filling of the grooves 3 on the impact of magnetic force waves.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=6380082

Family Applications (1)

Country Status (7)

Families Citing this family (10)

Family Cites Families (13)

• 1989
  • 1989-04-28 DE DE3914731A patent/DE3914731A1/de not_active Withdrawn
  • 1989-07-06 JP JP1507193A patent/JPH04504947A/ja active Pending
  • 1989-07-06 EP EP89907660A patent/EP0468958A1/de not_active Ceased
  • 1989-07-06 WO PCT/DE1989/000452 patent/WO1990013935A1/de not_active Application Discontinuation
  • 1989-07-06 BR BR898907888A patent/BR8907888A/pt not_active Application Discontinuation
• 1991
  • 1991-10-25 FI FI915053A patent/FI915053A0/fi unknown
  • 1991-12-30 US US07/768,716 patent/US5196751A/en not_active Expired - Fee Related

Non-Patent Citations (1)

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