JPH05161292A - Three-phase armature winding - Google Patents

Abstract

PURPOSE:To obtain a three-phase concentric armature winding having high degree of freedom in design, a low vibration and low noise by forming number of turns in one slot the same odd number for all the slots. CONSTITUTION:The three-phase armature winding comprises even number of coils wound differently in one slot by a magnification of paired number of poles = 1 or paired number of poles = 2. (N+-1)/twice and (N-1)/twice (where N = odd number) of number of turns of coils wound differently in one slot are alternately wound, and the number of turns of the other coils is N times. Thus, the numbers of conductors in the slots become the same odd number for all the slots, thereby improving the degree of freedom in design. Accordingly, electric characteristics of a motor intended by a designer can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase motor having a three-phase concentric winding type armature winding.

[0002]

2. Description of the Related Art Conventionally, in a three-phase concentric armature winding in which a number of pole pairs = 1 or a multiple of pole pairs = 2, and a coil for winding different coils in one slot (hereinafter referred to as distribution coil) is evenly unique. In order to make the number of turns of each distribution coil the same, the number of conductors in the slot was only even. Therefore, when an odd number of turns = N is required, the number of conductors in the slot around which the distribution coil is wound is unified to either (N + 1) / 2 or (N-1) / 2. The number of conductors is {(N + 1) / 2}
Only an even number of x2 or {(N-1) / 2} x2 is possible. However, in the case of {(N + 1) / 2} × 2, the conductor space factor in the slot becomes high and the workability deteriorates, so {(N-
1) / 2} × 2 was adopted, and the number of conductors in the slot was N for slots in which other different coils were not wound. According to this method, the number of conductors in one slot is not the same for all slots, and the average number of conductors is not an integer. Due to these restrictions, the degree of freedom in design was low.

A conventional example will be described using a 4-pole-36 slot. FIG. 5 shows a winding development view. 5, 1 to 36 are slot numbers, U, V and W are phase terminals N are neutral points, and solid lines are U.
Phase winding, dotted line represents V phase winding, alternate long and short dash line represents W phase winding,
The wiring is 1xY. This winding development view is the same for both the prior art and the present invention. Where the number of conductors in one slot is N
A case where it becomes necessary to set (N is an odd number) will be described with reference to FIG. FIG. 6 is a development view of the U-phase winding.
Is the slot number, the solid line is the U-phase winding, (N-1) / 2, N
Represents the number of coil turns. Although only the U-phase winding is shown in FIG. 6 for simplification, the V-phase and W-phase windings are wound with the same number of coil turns at positions shifted by 120 ° in electrical angle.

[0004]

The distribution coils wound in the slot numbers 1, 10, 19, 28 in FIG. 6 have the same (N-1) / 2 turns, and the number of conductors in the slot is two. Is wound, so {(N-1) / 2} × 2
Becomes Since the other coils have N turns, the average number of conductors is [N + {(N-1) / 2} × 2 + N] / 3 = (3
N-1) / 3 turns, not an integer, and the required 1
The number of conductors in the slot is not N (N is an odd number). When it is necessary to set the number of conductors in one slot to N (N is an odd number), as a combination of the number of turns other than the above, the average number of conductors of the combination of distribution coil (N + 1) / 2 turns and other coil N turns ( 3N + 1) / 3 turns. Or distribution coil (N-1) / 2 turns and other coil (N +)
1) Average number of conductors in a combination of turns (3N + 1) / 3 turns. Alternatively, the average number of conductors (3N-1) / 3 turns in a combination of the distribution coil (N + 1) / 2 turns and the other coil (N-1) turns can be considered. As described in the previous section, in these combinations, the number of conductors per slot is {(N
Since the conductor space factor of the slot of (+1) / 2} × 2 or (N + 1) becomes high and the workability deteriorates, a combination of distribution coil (N-1) / 2 turns and other coil N turns is adopted. I'm going.

FIG. 7 shows a three-phase magnetomotive force waveform when N = 3 in the case of FIG. This magnetomotive force waveform is +1, V for U phase
It is assumed that a current of −0.5 flows in the phase and the W phase, and the waveform is represented as the product of this current and the number of each slot conductor.

FIG. 8 shows a voltage vector diagram for one phase when N = 3 in the case of FIG. This voltage vector diagram shows the product of this current and the number of conductors in the slot as the length of the vector when a +1 current is applied to one phase.

Although only one phase is shown in this voltage vector diagram, all three phases are balanced as the same vector at positions shifted by 120 °. When the winding coefficient is obtained from this voltage vector diagram, K = 0.9548.

The present invention is a multiple of the number of pole pairs = 1 or the number of pole pairs = 2, and in a three-phase concentric armature winding having an even number of coils in which different coils are wound in one slot, the number of conductors in each slot is all. An object of the present invention is to provide a three-phase concentric armature winding with a high degree of design freedom that can be the same odd number.

[0009]

SUMMARY OF THE INVENTION The present invention is a three-phase armature winding having an even number of coils in which different coils are wound in one slot in a multiple of pole pair number = 1 or pole pair number = 2.
The number of turns of each of the coils having different coils wound in one slot is alternately (N + 1) / 2 and (N-1) / 2 (N = odd), and the other coils are wound. The number of times is N times (N is an odd number).

[0010]

In the three-phase armature winding wound as described above, the number of conductors in the slot is an odd number, which is the same for all slots, and the degree of freedom in design is improved. As a result, the electric characteristics of the electric motor intended by the designer can be improved.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 and 5 in the case of 4-pole-36 slots. Figure 5
Figure 2 shows the winding development diagram. 1 to 36 in FIG. 5 are slot numbers,
U, V and W are phase terminals, N is a neutral point, solid lines are U phase windings,
The dotted line represents the V-phase winding, and the dotted line represents the W-phase winding, which is a 1 × Y connection. This winding development view is the same for both the prior art and the present invention. Here, a case where it is necessary to set the number of conductors in one slot to N (N is an odd number) will be described with reference to FIG. FIG. 1 shows a U-phase winding development view, 1 to 36 are slot numbers, solid lines are U-phase windings, (N + 1) / 2, (N-1)
/ 2, N represents the number of coil windings. Although only the U-phase winding is shown in FIG. 1 for simplicity, the V-phase and the W-phase are 120 electrical degrees each.
It is wound at the positions shifted by the same number of times with the same number of coil turns.
The number of windings of the coils wound in the slot numbers 1, 10, 19, 28 in FIG. 1 is (N-1) / 2 for the coils # 1 to # 10.
# 10 to # 19 coils are (N + 1) / 2 times, # 1
The coils of 9 to # 28 are (N-1) / 2 times, # 28 to # 1
(N-1) / 2 times and (N + 1) / 2 times are alternately wound like the coil (N + 1) / 2 times of (N-1) / 2 times and (N + 1) / 2 times. , it goes without saying that both for the number of sorting coil is an even number is also in the previous. Further, the number of turns of the other coils is N times (N is an odd number) as required.

When each coil is wound as described above, the number of conductors in each slot is (N + 1) / 2 + (N- for the # 1 slot.
1) / 2 = N, # 10 slot is (N-1) / 2 + (N
+1) / 2 = N, # 19 slot is (N + 1) / 2 +
(N-1) / 2 = N, # 28 slot is (N-1) / 2
+ (N + 1) / 2 = N, which is the same as other slots.
Therefore, the number of conductors in all slots is N (N = odd number) as required.

FIG. 2 shows a three-phase magnetomotive force waveform when N = 3 in the case of this embodiment. This magnetomotive force waveform is +
It is assumed that a current of -0.5 has flowed in the 1st and Vth phases, and is a waveform represented as a product of this current and the number of each slot conductor.

FIG. 3 shows a voltage vector diagram for one phase when N = 3 in the case of the present embodiment. This voltage vector diagram shows the product of this current and the number of conductors in the slot as the length of the vector when a +1 current is applied to one phase.
This voltage vector diagram shows only one phase, but for all three phases 12
Balance as the same vector at positions shifted by 0 °. When the winding coefficient is calculated from this voltage vector diagram, K =
It becomes 0.9596.

FIG. 4 shows the magnetomotive force waveform of FIG. 2 of this embodiment and the magnetomotive force waveform of FIG. 7 superimposed on the same diagram. In FIG. 4, the solid line is the magnetomotive force waveform of the present invention, the dotted line is the magnetomotive force waveform of the conventional example,
The alternate long and short dash line represents the center line. Comparing these waveforms, it can be seen that the dotted line of the conventional example is distorted near the center point. Therefore, it can be said that the present embodiment has a waveform closer to a sine wave, and as a result, the vibration and noise characteristics of the electric motor can be improved as compared with the conventional one. Further, comparing the winding vector obtained from the voltage vector diagram of FIG. 3 of the present example with the voltage vector diagram of FIG. 8 of the conventional example, K = 0.94848 in the conventional example, whereas K = 0.548 in the present example. Although it is as small as 9596, this embodiment is improved. In addition to the above effects, it is possible to make the number of conductors in all slots the same odd number, and the degree of freedom in design is improved. (Other embodiments)

The present invention is not limited to the above embodiment, but can be implemented with various modifications such as 36 slots of 8 poles, 54 slots of 8 poles, 72 slots of 8 poles, etc. within the scope not changing the gist. it can.

[0017]

As described above, according to the present invention, the number of pole pairs = 1 is a multiple of the number of pole pairs = 2, and a three-phase concentric armature winding having an even number of coils in which different coils are wound in one slot is provided. In the wire, it is possible to provide a three-phase concentric armature winding that has the same number of conductors in each slot and has a high degree of design freedom, low vibration, and low noise. It is a thing.

[Brief description of drawings]

FIG. 1 is a development view of a U-phase winding in the case of a 4-pole-36 slot according to an embodiment of the present invention,

FIG. 2 is a magnetomotive force waveform diagram in the case of FIG. 1,

FIG. 3 is a voltage vector diagram for one phase of FIG.

FIG. 4 is a composite diagram of FIGS. 2 and 7;

FIG. 5 is a development view of windings in the case of the same 4-pole-36 slot of the present invention and the prior art.

FIG. 6 is a U-phase winding development view in the case of a conventional 4-pole-36 slot,

FIG. 7 is a magnetomotive force waveform diagram in the same case,

FIG. 8 is a similar one-phase voltage vector diagram.

[Explanation of symbols]

U _{1 to} U ₄ U-phase first pole to fourth pole coils V _{1 to} V ₄ V-phase first pole to fourth pole coils W _{1 to} W ₄ W-phase first pole to fourth poles Each coil of pole

Claims (1)

[Claims] 1. A three-phase armature winding having an even number of coils, each of which has a number of pole pairs which is a multiple of 1 or 2 and which has different coils wound in one slot, each coil having a different coil wound in one slot. The number of turns of (N + 1) / 2 times and (N-
By alternately winding 1) / 2 times (N = odd number),
A three-phase armature winding characterized in that the number of turns in one slot is an odd number, which is the same for all slots.