Novel single-layer and double-layer mixed unequal-turn winding

Abstract

The invention discloses a novel single-layer and double-layer mixed unequal-turn winding, which relates to the field of motor manufacturing, comprises U, V and W three-phase windings which are uniformly distributed, and coil windings are concentrically connected, and is characterized in that each group of coils of 2, 4 and 6-pole motors with integer slots of which the slot number q of each pole and each phase is greater than or equal to 3 consists of at least one double-layer winding and one single-layer winding, the number of turns of external coils of the same winding is minimum, the number of turns of internal coils is more and more, and cosine distribution is formed; the consumption of copper materials of the winding can be effectively reduced, higher harmonics can be effectively weakened, and the efficiency of the motor is improved.

Description

Technical Field

[0001] The invention relates to the field of motor manufacturing, and in particular to a novel winding. Background Art

[0002] Although ordinary single-layer or double-layer windings are relatively simple and convenient in winding, inserting and wiring, they also have disadvantages such as high copper consumption at the end, high copper consumption, low efficiency, high temperature rise, and high electromagnetic harmonics. At present, when each winding adopts the concentric winding form, the conventional winding method is that the number of turns of the outer coil of the same winding is more and the number of turns of the inner coil is less. Even if the number of turns of the outer coil and the inner coil of the same winding is the same, since the span of the outer coil is greater than the span of the inner coil, the end length of the outer coil of the winding must be greater than the end length of the inner coil, the amount of copper used in the coil is large, the copper consumption is high, and the production cost of the motor is difficult to reduce. Summary of the invention

[0003] The purpose of the present invention is to provide a novel single-layer and double-layer mixed unequal-turn winding, which can not only effectively reduce the copper consumption of the winding but also effectively weaken high-order harmonics and improve the efficiency of the motor.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a new type of single- and double-layer mixed unequal-turn winding, comprising U, V, and W three-phase windings evenly distributed, and the coil windings are concentrically connected, characterized in that: 2, 4, and 6-pole motors with an integer number of slots per pole and per phase q≥3, each group of coils is composed of 1 single-layer winding and at least 1 double-layer winding, the outer coil of the same winding has the least number of turns, and the inner coil has an increasing number of turns, forming a cosine distribution.

[0005] The present invention changes the winding distribution, with fewer external coils and more internal coils, which can reduce the length of the winding end, reduce the amount of copper used, reduce costs, and effectively weaken high-order harmonics, further reduce the copper loss of the motor, and improve the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 , 2 3 are the winding expansion diagrams of the first, second and third embodiments of the present invention respectively.

[0007] Figure 1 In the middle, q = 3, 6 poles, 54 slots; Figure 2 In the middle, q = 4, 4 poles, 48 ​​slots; Figure 3 In the figure, q=6, 2 poles, 36 slots. DETAILED DESCRIPTION

[0008] The novel single- and double-layer mixed unequal-turn winding provided by the present invention comprises three-phase windings of U, V and W which are evenly distributed, the coil windings are concentrically connected, and the 2-, 4- and 6-pole motors have an integer number of slots per pole and per phase, q≥3. Each group of coils is composed of 1 single-layer winding and at least 1 double-layer winding. The number of turns of the outer coil of the same winding is the least, and the number of turns of the inner coil is increasing, forming a cosine distribution.

[0009] The above technical solution mainly solves the problem in the prior art that the ends of the external coils of the same winding span a large space and consume materials. A solution is adopted in which the number of turns of the external coils of the same winding is the least and the number of turns of the internal coils is increasing. The excessive length of the winding ends and the increase in the number of turns will inevitably increase the amount of copper used. Therefore, the solution provided by the present invention directly reduces the material cost of the motor, effectively weakens high-order harmonics, and improves the efficiency of the motor. In addition, since the number of turns of the external coils is reduced, the time consumed in winding the coils is also reduced accordingly, further improving the winding efficiency of the windings.

[0010] Preferably, the internal coil turns of the same winding are the largest, the maximum span is 1~τ+(q-2), where τ is the pitch, and the minimum span is (q-1)~τ, where τ is the pitch, q is the number of slots per pole per phase and q≥3.

[0011] There is only one single-layer winding in each coil group, which is suitable for 2, 4, and 6-pole motors with an integer number of slots per pole and per phase q≥3. Its winding has the least external coils, and the internal coils have more and more turns. The single-layer winding has the most turns, which is cosine distributed. The maximum span is 1~τ+(q-2), where τ is the pitch. At this time, it is a double-layer winding with the least number of turns; the span is 2~τ+(q-1), which is also a double-layer winding, but the number of turns has increased...; the span is (q-1)~τ, which is a single-layer winding with the most turns.

[0012] The following combination Figure 2 The disclosed embodiment 2 is described in detail by taking a 48-slot 4-pole winding as an example.

[0013] Figure 2 In the figure, the three-phase windings consisting of the U-phase winding, the V-phase winding, and the W-phase winding are evenly distributed, and each phase winding has four groups of coils, each coil consisting of a double-layer winding 1, a double-layer winding 2, and a single-layer winding 3. The order of embedding is: first embed the first group of coil windings of the U-phase, spans 1 to 14 are double-layer windings 1, spans 2 to 13 are double-layer windings 2, and spans 3 to 12 are single-layer windings 3; leave one slot empty, and embed the first group of windings of the V-phase from the 5th slot (the embedding order is consistent with the U-phase); leave one slot empty, and embed the first group of coil windings of the W-phase from the 9th slot; leave one slot empty, and embed the second group of coil windings of the U-phase from the 13th slot... and then embed the last coil of the W-phase (single-layer windings of spans 43 to 4).

[0014] The following tables 1, 2, and 3 are Figure 1, 2 , 3 corresponding to the internal distribution table of windings.

[0015] Table 1:

[0016]

[0017] In the above Table 1: the three-phase symmetrical windings are U, V, and W respectively; the 6-pole winding has 6 groups per phase, each group has 2 coils, one of which is a double-layer winding and the other is a single-layer winding; the first coil has fewer turns (occupies about 1 / 2 of the entire slot type), and is embedded in the same slot with the other group of coils of the same phase, which is a double-layer winding and is marked as U-1 (V-1 or W-1); the second coil has more turns (occupies the entire slot type), is a single-layer winding, and is marked as U-2 (V-2 or W-2).

[0018] Table 2:

[0019]

[0020] In the above Table 2: the three-phase symmetrical windings are U, V, and W respectively; the four-pole winding has four groups per phase, each group has three coils, two of which are double-layer windings and one is a single-layer winding; the first coil has the least number of turns (occupying about 1 / 3 of the entire slot), and is embedded in the same slot with another group of coils of the same phase (the number of turns occupies 2 / 3 of the slot), which is a double-layer winding and is marked as U-1 (V-1 or W-1); the second coil has a larger number of turns (occupying about 2 / 3 of the entire slot), and is embedded in the same slot with another group of coils of the same phase (the number of turns occupies 1 / 3 of the slot), which is also a double-layer winding and is marked as U-2 (V-2 or W-3); the third coil has more turns (occupying the entire slot), is a single-layer winding, and is marked as U-3 (V-3 or W-3).

[0021] Table 3:

[0022]

[0023] In the above Table 3: the three-phase symmetrical windings are U, V, and W respectively; the two-pole winding has two groups per phase, each group has five coils, four of which are double-layer windings and one is a single-layer winding; the first coil has the least number of turns (occupying about 1 / 5 of the entire slot type), and is embedded in the same slot with another group of coils of the same phase (the number of turns occupies 4 / 5 of the slot type), which is a double-layer winding and is marked as U-1 (V-1 or W-1); the second coil has an increased number of turns (occupying about 2 / 5 of the entire slot type), and is embedded in the same slot with another group of coils of the same phase (the number of turns occupies 3 / 5 of the slot type). Slot, also a double-layer winding, marked as U-2 (V-2 or W-3); the number of turns of the third coil continues to increase (occupying about 3 / 5 of the entire slot), and is embedded in the same slot with another group of coils with the same phase (the number of turns occupies 2 / 5 of the slot), which is a double-layer winding; the number of turns of the fourth coil continues to increase (occupying about 4 / 5 of the entire slot), and is embedded in the same slot with another group of coils with the same phase (the number of turns occupies 1 / 5 of the slot), which is a double-layer winding; the fifth coil has more turns (occupying the entire slot), which is a single-layer winding, marked as U-5 (V-5 or W-5).

[0024] Table 4: Comparative test (WN-132S-4 type data summary table)

[0025]

[0026] Conclusion: The performance of this prototype is similar to that of the sine solution in terms of copper usage and motor performance. This prototype is easier to embed, the winding die can be shortened, the copper usage can be reduced, and the efficiency can be improved.

Claims

1. A new type of single- and double-layer mixed unequal turn winding, including three-phase windings of U, V, and W, which are evenly distributed, and the coil windings are concentrically connected, characterized in that: For 2-, 4-, and 6-pole motors with an integer number of slots per pole and per phase (q≥3), each set of coils consists of 1 single-layer winding and at least 1 double-layer winding. The outer coil of the same winding has the least number of turns, while the inner coil has an increasing number of turns, forming a cosine distribution.

2. The novel single-layer and double-layer hybrid unequal-turn winding according to claim 1 is characterized in that: The internal coil of the same winding has the largest number of turns.

3. The novel single-layer and double-layer hybrid unequal-turn winding according to claim 1 or 2, characterized in that: The maximum span is 1~τ+(q-2), where τ is the pitch, and the minimum span is (q-1)~τ, where τ is the pitch, q is the number of slots per pole per phase and q≥3.

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