Rotating Electric Machine

Abstract

To provide a rotary electric machine that can reduce loss of an armature winding.SOLUTION: An armature winding of a rotary electric machine comprises two phase belts 3 and 9 per phase, and the phase belts are made of two parallel circuits. An average position in a circumference direction of all of an upper coil piece 1 and a lower coil piece 2 constituting the phase belts is set as a center of phase belts 4 and 10. When arrangements of first and second parallel circuits in at least one phase belt are viewed in order from the arrangement closest to the center of the phase belts, the upper coil piece or the lower coil piece and the lower coil piece or the upper coil piece connected to them are arranged in the order of the first, the second, the first, the first, the second, the first, the first, the first and the second parallel circuits. When the arrangements of the second and third parallel circuits in the other one phase belt are viewed in the order from the arrangement closest to the center of the phase belts, the upper coil piece or the lower coil piece and the lower coil piece or the upper coil piece connected to them are arranged in the order of the third, the second, the third, the third, the second, the third, the third, the third and the second parallel circuits.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine, and more particularly to a rotating electric machine suitable for use in a large generator such as a turbine generator. [Background technology]

[0002] Large-capacity generators have a large output current, which causes large electromagnetic forces and heat generation in the armature windings. To address this, the armature windings are configured with multiple parallel circuits to reduce the current per armature winding and mitigate the electromagnetic forces and temperature rise.

[0003] Prior art documents for such technology include Patent Documents 1 and 2.

[0004] The above-mentioned Patent Document 1 describes that each phase of the armature winding is composed of three parallel circuits, but in order to reduce the number of inter-pole cross-wires connecting the poles, a pair of parts in each phase belt are connected in series by conductors, and the remaining parts are connected in series with their counterparts in the opposing phase belt by inter-pole cross-wires.

[0005] On the other hand, as an armature winding for a rotating electric machine such as a large-capacity turbine generator, for example, Patent Document 2 describes an armature winding for a rotating electric machine that has 54 slots and attempts to suppress unbalanced voltages by suppressing current imbalance caused by circulating currents between two-pole, three parallel circuits.

[0006] Patent Document 2 describes an armature winding for a rotating electric machine having a three-phase, two-pole, two-layer armature winding in which three parallel circuit coils are accommodated in 54 slots to suppress the voltage generated between each circuit and to suppress circulating currents, with three parallel circuits configured for each phase of the armature winding, with the coils of the three parallel circuits accommodated in 54 slots formed in a stator core in which each phase is divided into a first phase band and a second phase band, the coils of each circuit are connected in series, the series-connected coils are divided into upper coil pieces and lower coil pieces, at least one jumper wire is placed on either the connection side coil end or the non-connection side coil end of each of the coils of the first phase band and second phase band, and the arrangement of the circuit numbers of the upper coil pieces and lower coil pieces is swapped. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] U.S. Pat. No. 3,660,705 [Patent Document 2] JP 2001-309597 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, while the technology described in Patent Document 1 mentioned above can reduce the number of inter-pole wires, it cannot reduce the current imbalance caused by the circulating current between the parallel circuits, and there is little possibility of reducing losses in the armature winding.

[0009] On the other hand, in the technology described in the above-mentioned Patent Document 2, the number of inter-pole cross wires connecting the winding poles increases, and there is still room for improvement in reducing losses in the armature winding.

[0010] The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to provide a rotating electric machine which reduces the number of inter-pole wires connecting the winding poles, and which can reduce current imbalance due to circulating current between parallel circuits, thereby reducing losses in the armature winding. [Means for solving the problem]

[0011] In order to achieve the above object, the rotating electric machine of the present invention is a rotating electric machine comprising a two-pole rotor, a three-phase armature winding, and an iron core having 54 slots in which the armature winding is stored in two layers, upper and lower, as upper coil pieces and lower coil pieces, the armature winding having three parallel circuits for one phase, one of the three parallel circuits having an inter-pole crossover wire connecting two different poles and the other two circuits having crossover wires constituting the same pole, the armature winding has two phase belts per phase, each of the phase belts consisting of two parallel circuits, the circumferential average position of all of the upper coil pieces and the lower coil pieces constituting the phase belt is set as the phase belt center, and the arrangement of the first and second parallel circuits in at least one of the phase belts is determined based on the phase belt center. When viewed from the order of proximity, the upper coil pieces or the lower coil pieces are arranged in the order of 1, 2, 1, 1, 2, 1, 1, 1, 2 parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of 1, 2, 1, 1, 2, 1, 1, 1, 2 parallel circuits, and when the arrangement of the second and third parallel circuits in another one of the phase belts is viewed from the order of proximity to the phase belt center, the upper coil pieces or the lower coil pieces are arranged in the order of 3, 2, 3, 3, 2, 3, 3, 3, 2 parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of 3, 2, 3, 3, 2, 3, 3, 3, 2 parallel circuits, or Alternatively, the armature winding has two phase belts per phase, each of which is made up of two parallel circuits, and when the circumferential average position of all of the upper coil pieces and the lower coil pieces constituting the phase belt is taken as the phase belt center, and when the arrangement of the first and second parallel circuits in at least one of the phase belts is viewed in order from closest to the phase belt center, the upper coil pieces or the lower coil pieces are arranged in the order of the first, second, first, first, second, first, second, first, first, first parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of the first, second, first, first, first, second, first, second, first, first parallel circuits. When the arrangement of the second and third parallel circuits in another phase belt is viewed in order from closest to the phase belt center, the upper coil pieces or the lower coil pieces are arranged in the order of 3, 2, 3, 3, 2, 3, 2, 3, 3, 3 parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of 3, 2, 3, 2, 3, 3, 3, 2, 3 parallel circuits. Effect of the Invention

[0012] According to the present invention, the number of inter-pole cross wires connecting the winding poles can be reduced, and current imbalance due to circulating current between parallel circuits can be reduced, thereby reducing losses in the armature winding. [Brief description of the drawings]

[0013] [Figure 1] 1 is a diagram showing a schematic configuration of a turbine generator which is an example of a rotating electric machine according to the present invention; [Diagram 2] FIG. 2 is a diagram showing a connection method for two phase belts in the first embodiment of the rotating electric machine of the present invention. [Diagram 3] FIG. 11 is a diagram showing a connection method for two phase belts in a rotating electric machine according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The rotating electrical machine of the present invention will be described below based on the illustrated embodiments. In each embodiment, the same reference numerals are used for the same components.

[0015] The rotating electric machine of the present invention, for example a turbine generator, is provided with an armature winding in which a winding circuit is formed on a stator core extending in the axial direction and having a plurality of slots at predetermined intervals in the circumferential direction. The winding circuit is made up of poles formed by connecting coils housed in the slots in series, and crossover wires connecting the coils to the line side terminals and neutral side terminals. The coils and crossover wires are connected at the coil end portions, and the crossover wires are connected to the line side terminals and neutral side terminals from the connection portion with the coils circumferentially through the space at the axial end of the collector ring side of the stator core.

[0016] A turbine generator having such a configuration is shown in FIG.

[0017] As shown in the figure, the turbine generator 100 has a two-pole, three-phase armature winding 11, which is housed in 54 slots provided in a stator core 12, and the armature winding 11 and the stator core 12 form a stator 13. In addition, a rotor 14 having a field generator is arranged on the inner periphery of the stator 13, approximately coaxially with the stator 13, with a gap therebetween, thereby forming the turbine generator 100.

[0018] A power supply device consisting of a collector ring and brushes is provided at one axial end of the turbine generator 100, and a turbine is provided at the other axial end, which transmits mechanical output to a rotor 14. On the collector ring side, the output wires 6 (see FIG. 2) of each phase of the armature winding 11 are arranged, along with bushings and a terminal box, and the armature winding 11 is connected to a line side terminal and a neutral side terminal. EXAMPLES

[0019] FIG. 2 shows a connection method for two phase belts (a connection method for the armature winding 11 in FIG. 1) in the first embodiment of the rotating electric machine of the present invention.

[0020] As shown in the figure, the rotating electric machine (turbine generator 100) of this embodiment comprises a two-pole rotor 14, a three-phase armature winding 11, and an iron core (stator core 12) with 54 slots in which the armature winding 11 is stored in two layers, upper and lower, as upper coil pieces 1 and lower coil pieces 2, and the armature winding 11 is roughly configured with three parallel circuits per phase.

[0021] Of the three parallel circuits, one is placed within the north pole, one within the south pole, and the remaining one straddles the north and south poles, and the upper coil piece 1 and lower coil piece 2, which are at different angles in the circumferential direction, are connected by a jumper wire 5.

[0022] One of the three parallel circuits has an inter-pole crossover 8 connecting two different poles, and the other two circuits have crossovers 7 that configure the same pole. The armature winding 11 has two phase belts 3, 9 for each phase. These phase belts 3, 9 are made up of two parallel circuits. The circumferential average positions of all the upper coil pieces 1 and lower coil pieces 2 that configure the phase belts 3, 9 are respectively taken as phase belt centers 4, 10. When the arrangement of the first and second parallel circuits in at least one phase belt 3 is viewed in order of proximity to the phase belt center 4, the upper coil pieces 1 are arranged in the order of 1, 2, 1, 1, 2, The upper coil pieces 1 are arranged in the order of 1, 1, 1, 2 parallel circuits, and the lower coil pieces 2 connected to them are arranged in the order of 1, 2, 1, 1, 2, 1, 1, 1, 2 parallel circuits, and when the arrangement of the second and third parallel circuits in another phase belt 9 is viewed in order from closest to the phase belt center 10, the upper coil pieces 1 are arranged in the order of 3, 2, 3, 3, 2, 3, 3, 3, 2 parallel circuits, and the lower coil pieces 2 connected to them are arranged in the order of 3, 2, 3, 3, 2, 3, 3, 3, 2 parallel circuits.

[0023] By adopting such a configuration of the present embodiment, the current imbalance due to the circulating current between the parallel circuits can be made smaller than that of the prior art, and as a result, a rotating electric machine having an armature winding 11 with reduced losses can be obtained.

[0024] As a modification of the first embodiment, the arrangement of the upper coil pieces 1 and the lower coil pieces 2 in either one or both of the phase belts 3 and 9 may be interchanged. For example, if the arrangements of the upper coil pieces 1 and the lower coil pieces 2 are swapped for both phase belts 3 and 9 from Example 1, when the arrangement of the first and second parallel circuits in at least one phase belt 3 is viewed in order from closest to the phase belt center 4, the lower coil pieces 2 are arranged in the order of 1, 2, 1, 1, 2, 1, 1, 1, 2 parallel circuits, and the upper coil pieces 1 connected to them are arranged in the order of 1, 2, 1, 1, 2, 1, 1, 1, 2 parallel circuits, and when the arrangement of the second and third parallel circuits in another phase belt 9 is viewed in order from closest to the phase belt center 10, the lower coil pieces 2 are arranged in the order of 3, 2, 3, 3, 2, 3, 3, 3, 2 parallel circuits, and the upper coil pieces 1 connected to them are arranged in the order of 3, 2, 3, 3, 2, 3, 3, 3, 2 parallel circuits.

[0025] Even in such a modified example in which the arrangement of the upper coil pieces 1 and the lower coil pieces 2 in each phase belt is interchanged for either or both of the phase belts 3 and 9 in the first embodiment, the same effects as those in the first embodiment can be obtained. EXAMPLES

[0026] FIG. 3 shows a connection method for two phase belts (a connection method for the armature winding 11 in FIG. 1) in a rotating electric machine according to a second embodiment of the present invention.

[0027] As shown in the figure, the rotating electric machine (turbine generator 100) of this embodiment comprises a two-pole rotor 14, a three-phase armature winding 11, and an iron core (stator core 12) with 54 slots in which the armature winding 11 is stored in two layers, upper and lower, as upper coil pieces 1 and lower coil pieces 2, and the armature winding 11 is roughly configured with three parallel circuits per phase.

[0028] Of the three parallel circuits, one is placed within the north pole, one within the south pole, and the remaining one straddles the north and south poles, and the upper coil piece 1 and lower coil piece 2, which are at different angles in the circumferential direction, are connected by a jumper wire 5.

[0029] One of the three parallel circuits has an inter-pole crossover 8 connecting two different poles, and the other two circuits have crossovers 7 that configure the same pole. The armature winding 11 has two phase belts 3, 9 for each phase. These phase belts 3, 9 are made up of two parallel circuits. The circumferential average positions of all the upper coil pieces 1 and lower coil pieces 2 that configure the phase belts 3, 9 are respectively taken as phase belt centers 4, 10. When the arrangement of the first and second parallel circuits in at least one phase belt 3 is viewed in order of proximity to the phase belt center 4, the upper coil pieces 1 are arranged in the order of 1, 2, 1, 1, 2, The upper coil pieces 1 are arranged in the order of 1, 2, 1, 1 parallel circuits, and the lower coil pieces 2 connected to them are arranged in the order of 1, 2, 1, 2, 1, 1, 1, 2, 1 parallel circuits, and when the arrangement of the second and third parallel circuits in another phase belt 9 is viewed in order from closest to the phase belt center 10, the upper coil pieces 1 are arranged in the order of 3, 2, 3, 3, 2, 3, 2, 3, 3 parallel circuits, and the lower coil pieces 2 connected to them are arranged in the order of 3, 2, 3, 2, 3, 3, 3, 2, 3 parallel circuits.

[0030] Even with this configuration of the present embodiment, the same effects as those of the first embodiment can be obtained.

[0031] As a modification of the second embodiment, the arrangement of the upper coil pieces 1 and the lower coil pieces 2 in either one or both of the phase belts 3 and 9 may be interchanged. For example, if the arrangements of the upper coil pieces 1 and the lower coil pieces 2 are swapped for both phase belts 3 and 9 from Example 2, when the arrangement of the first and second parallel circuits in at least one phase belt 3 is viewed in order from closest to the phase belt center 4, the lower coil pieces 2 are arranged in the order of the first, second, first, first, first, second, first, second, first, first parallel circuits, and the upper coil pieces 1 connected to them are arranged in the order of the first, second, first, second, first, first, first, first, second, first parallel circuits, and when the arrangement of the second and third parallel circuits in another phase belt 9 is viewed in order from closest to the phase belt center 10, the lower coil pieces 2 are arranged in the order of the third, second, third, third, second, third, second, third, third, third, third parallel circuits, and the upper coil pieces 1 connected to them are arranged in the order of the third, second, third, second, third, third, third, third, third, second, third parallel circuits.

[0032] Even in such a modified example in which the arrangement of the upper coil pieces 1 and the lower coil pieces 2 in each phase belt is interchanged for either or both of the phase belts 3 and 9 in the second embodiment, the same effects as those in the second embodiment can be obtained.

[0033] The present invention is not limited to the above-mentioned embodiment, but includes various modified examples. For example, the above-mentioned embodiment has been described in detail to easily explain the present invention, and is not necessarily limited to those including all of the configurations described. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0034] 1...upper coil piece, 2...lower coil piece, 3, 9...phase belt, 4, 10...phase belt center, 5...jumper wire, 6...lead wire, 7...same pole connecting wire, 8...inter-pole connecting wire, 11...armature winding, 12...stator core, 13...stator, 14...rotor, 100...turbine generator.

Claims

1. A rotating electric machine comprising: a two-pole rotor; a three-phase armature winding; and an iron core having 54 slots in which the armature winding is stored in two layers, upper and lower, as upper and lower coil pieces, the armature winding having three parallel circuits for each phase, One of the three parallel circuits has an inter-pole crossover that connects two different poles, and the other two circuits have crossovers that connect the same pole, the armature winding has two phase belts per phase, each phase belt consisting of two parallel circuits, and when the circumferential average position of all the upper coil pieces and the lower coil pieces constituting the phase belt is taken as a phase belt center, and the arrangement of the first and second parallel circuits in at least one of the phase belts is viewed in order from closest to the phase belt center, the upper coil pieces or the lower coil pieces are arranged in the order of first, second, first, first, second, first, first, first, second parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of first, second, first, first, first, second, first, first, first, second parallel circuits, a rotating electric machine characterized in that, when the arrangement of the second and third parallel circuits in another one of the phase belts is viewed in order from closest to the phase belt center, the upper coil pieces or the lower coil pieces are arranged in the order of third, second, third, third, second, third, third, third, third, second parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of third, second, third, third, second, third, third, third, third, second parallel circuits.

2. A rotating electric machine comprising: a two-pole rotor; a three-phase armature winding; and an iron core having 54 slots in which the armature winding is stored in two layers, upper and lower, as upper and lower coil pieces, the armature winding having three parallel circuits for each phase, One of the three parallel circuits has an inter-pole crossover that connects two different poles, and the other two circuits have crossovers that connect the same pole, the armature winding has two phase belts per phase, each phase belt consisting of two parallel circuits, and when the circumferential average position of all the upper coil pieces and the lower coil pieces constituting the phase belt is taken as a phase belt center, and the arrangement of the first and second parallel circuits in at least one of the phase belts is viewed in order from closest to the phase belt center, the upper coil pieces or the lower coil pieces are arranged in the order of first, second, first, first, second, first, second, first, first, first parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of first, second, first, second, first, first, first, first, second, first parallel circuits, a rotating electric machine characterized in that, when the arrangement of the second and third parallel circuits in another one of the phase belts is viewed in order from closest to the phase belt center, the upper coil pieces or the lower coil pieces are arranged in the order of third, second, third, third, second, third, second, third, third, third parallel circuits, and the lower coil pieces or the upper coil pieces connected thereto are arranged in the order of third, second, third, second, third, third, third, third, second, third parallel circuits.

Images