JP3494729B2 - Three-phase armature winding - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an integer slot winding three-phase armature winding.

[0002]

2. Description of the Related Art Concentric winding is known as a method of winding a three-phase armature winding. In this method, the winding of each pole of each phase is composed of a plurality of concentric winding coils having different coil pitches, and these are arranged concentrically with respect to the center of the pole. This method is widely used because it is easy to insert a coil using an automatic insertion machine and has excellent productivity.

[0003]

However, there are the following problems. (1) Since the coil pitch is large, the leak reactance is large as compared with the short winding winding. Further, since the coil end length is longer than that of the lap winding, the winding resistance and the coil end leakage reactance are large, the torque characteristics are lower than those of the lap winding, and the loss is also increased.

(2) Since it is a single-layer winding in which one coil is housed in one slot, the coil insertability deteriorates in a model having a large coil volume, and the coil end is difficult to form, and the axial dimension is large. May become longer or damage the coil surface. Therefore, it is necessary to make the insulator thick enough to withstand the coil end molding process. An object of the present invention is to provide a three-phase armature winding having coil insertability equivalent to that of a single-layer concentric winding, excellent productivity, and excellent electrical characteristics equivalent to those of a lap winding.

[0005]

The armature winding of the present invention comprises:
The winding of each pole and phase consists of a combination of a single-layer coil and a two-phase coil, and the coil with the largest coil pitch in one coil group is a two-phase coil, and the number of coil groups is the number of poles. 1/2 of the aforesaid single-layer coil and double-layer coil
Is characterized in that they are arranged in a short-pitch winding manner .

[0006]

With the above-mentioned structure, the windings of each phase and each phase have the same coil arrangement in the slots as the lap winding of about 80%, and the leakage reactance is reduced. Further, in the% pitch of around 80%, the harmonic component of the air gap magnetic flux becomes the smallest, the torque characteristic is not deteriorated by the harmonic magnetic flux, and various electrical characteristics are significantly improved.

Since the coil is concentric, the insertion work of the coil can be easily automated, and since the coil is partially concentric with two layers, the coil is not concentrated and the coil circumference is shortened, and the coil end molding is also easy. Becomes

[0008]

[Embodiment] FIG. 1 and FIG.
To explain. FIG. 1 shows a coil development view, and FIG. 2 shows a coil arrangement in a slot. In the figure, numbers 1 to 48 are slot numbers, U1 to U4 are U-phase first to fourth pole windings, V
Reference numerals 1 to V4 denote V-phase first to fourth pole windings, and W1 to W4 denote W-phase first to fourth pole windings.

The winding on each layer of each pole is composed of three coils (U1).
In the case of, it is composed of U11 to U13). This U
Reference numeral 11 denotes a coil having a coil pitch of 8 extending from the slot 1 to the slot 9, and a coil of different phase and two layers are housed in the slot. U12 is a coil having a coil pitch of 6 from slot 2 to slot 8 and is housed in a single layer in the slot,
U13 is a coil having a coil pitch 7 extending from the slot 3 to the slot 7, and the coil having two different phases is housed in the slot. The same applies to other poles and other layers,
The description is omitted.

These coils are U-phase four coils (U1 to U1).
U4) is arranged so as to be located on the outermost periphery of the armature core, W1 to W4 are placed next, and finally V1 to V4 are placed.
As a result, as shown in FIG. 2, the arrangement of the coils in the slots is such that the coils having the maximum and minimum concentric winding pitches are accommodated in the slots in two layers with coils of different phases. The arrangement of this coil is the same as the overlap winding of 83.3% pitch except the upper and lower positions in the slot.

The arrangement of the coils in the slots is the same except for the lap winding of 83.3% pitch and the upper and lower sides of the coils in the slots, the leakage reactance is reduced, and the torque characteristics as well as efficiency and power factor are greatly improved. Will be. Further, the fifth and seventh air gap magnetic flux harmonic magnetomotive force components are reduced by 20 to 30%, and stray torque and stray loss are reduced.

Regarding the insertability of the coils, coils of the same phase can be inserted all at once, and all the coils can be accommodated by inserting three times. Also, in the conventional concentric winding, the coil for one pole is a single layer 2 coil, so it was necessary to make the coil circumference longer at the coil end than the lap winding, but in this method, the coil pitch is maximum and minimum. The coil has two layers, the concentration of the coil end is small, and the coil circumference can be shortened. As a result, coil resistance and coil end leakage reactance can be reduced, and torque characteristics and efficiency can be improved.

In the present embodiment, the efficiency and power factor are improved by the reduction of leakage reactance and resistance and the reduction of air gap harmonic magnetic flux. Further, the maximum torque and the pull-up torque are improved by the reduction of the stray torque and the leakage reactance, and the acceleration characteristics of the motor are improved. Further, the stray loss on the rotor surface is also reduced due to the reduction of the air gap harmonic magnetic flux.

From the viewpoint of coil insertion, the reduction of the amount of copper at the coil end facilitates coil end molding.
In addition, the number of insertion times is three, which is the number of phases, and the time required for manufacturing is shortened.

(Other Embodiments) In the above embodiment, a method suitable for a machine to be inserted in which the phases are inserted three times separately has been described.
Also in the method of sequentially inserting adjacent coil groups after inserting one coil group into the slot, as shown in FIG. 3, the arrangement of the coils is the same as the lap winding of 83.3% pitch except for the upper and lower positions in the slot. The same effect can be obtained in this method as well.

Although the above embodiment has been described with 8 poles, 4 poles, 1
The same effect can be obtained if the number of poles is a multiple of 4 such as 2 poles. Further, although the case where the number of slots for one pole and one phase is 2 has been described in the above embodiment, the same effect can be obtained if the number of slots for one pole and one phase is an integer.

[0017]

As described above, since the armature winding of the present invention has the same coil arrangement in the slots as the lap winding of about 80%, the characteristics such as torque and efficiency are better than those of the single-layer concentric winding. Will be greatly improved. Also, because it is a two-phase winding,
The amount of one coil per slot can be reduced, coil insertability is improved, coil molding is facilitated, and insulation failure on the coil surface is less likely to occur.

[Brief description of drawings]

FIG. 1 is a winding development view of an embodiment of the present invention,

FIG. 2 is a layout drawing of windings in a slot,

FIG. 3 is a winding layout diagram of another embodiment of the present invention.

[Explanation of symbols]

U1 to U4: U-phase coil, V1 to V4: U-phase coil, W1-W4: U-phase coil, U11 to U13: coils forming U1.

Claims (4)

(57) [Claims] 1. In a three-phase armature winding of integer slot winding, windings of each pole and each phase are composed of a combination of a single-layer coil and a double-layer coil, and a coil having a maximum coil pitch in one coil group is The single-layer coil and the double-layer coil are configured to be a double-layer coil, and the number of coil groups is 1/2 of the number of poles.
The three- phase armature windings are characterized in that they are arranged in a short-pitch winding manner . 2. The three-phase armature winding according to claim 1, wherein the number of poles is 4n (n is a positive integer). 3. The three-phase armature winding according to claim 2, wherein the three-phase armature winding is inserted into the slot three times for each phase. 4. The three-phase armature winding according to claim 2, wherein one coil group is inserted into the slot and then adjacent coil groups are sequentially inserted.