JPH0815378B2 - Pole conversion type single-phase motor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a one-to-two pole number conversion type single-phase electric motor,
The present invention relates to a device capable of reducing the number of coils inserted in the same groove.

[Prior art and its problems]

In the pole number conversion type single-phase motor, generally, three or four types of main windings and auxiliary windings for each pole are inserted in the same groove of the stator core, which makes the insertion work of the windings difficult. Not only that, but there is a drawback in that the electrical insulation between different kinds of windings increases and the space efficiency of the groove decreases.

[Object of the Invention]

The present invention eliminates the above-mentioned drawbacks by reducing the number of coils inserted in the same groove to one to two.
It is an object of the present invention to provide a pole-changing single-phase electric motor.

[Main points of the invention]

In order to achieve the above-mentioned object, the present invention sets the number of coils for each pole to the number of grooves / (2 × number of poles), and the main winding and the auxiliary winding have a 2: 1 coil number ratio and respectively. It is formed by concentric winding, and the pitch of the inserted grooves of these windings is set to the number of grooves / the number of poles-1 by the maximum coil of concentric winding.

Embodiment of the Invention FIGS. 1 and 2 show an embodiment of the present invention. Fig. 1 shows a winding diagram of a pole-changing single-phase motor with 2 poles / 4 poles with 24 slots in the stator core, corresponding to the groove numbers for convenience, and the upper half has 2 poles. The lower half is a winding diagram for four poles. Here, the two poles are N poles and S poles, and the four poles are two N poles and two S poles. Therefore, if the left side portion shown by the solid line in the main winding of the two-pole winding shown in FIG. 1 is, for example, the N pole, the right side portion shown by the solid line is also the S pole. Further, if the leftmost portion shown by the solid line in the main winding of the four-pole winding is, for example, the N pole, the right adjacent portion is the S pole, and the right adjacent portion is the N pole,
And the rightmost part becomes the south pole. In this figure, the number of coils for each pole (2 poles, 4 poles) is the number of grooves (24) / (2 x number of poles), and the main windings 21 and 41 and the auxiliary winding 22 shown by the dotted line The ratio of the number of coils with 42 is 2: 1.
That is, the number of coils for two poles is six, of which four are main windings 21 and two auxiliary windings 22. The number of coils for four poles is three, of which two are the main winding 41 and one is the auxiliary winding 42. Main winding 21, 41 and auxiliary winding 22
Are formed by concentric windings, and the pitch of the grooves inserted between these windings and the auxiliary winding 42 is the number of grooves / number of poles-1 in the maximum coil in the case of concentric winding. That is, the insertion groove pitch is 11 for the 2-pole winding and 5 for the 4-pole winding.
The auxiliary windings 22 and 42 are inserted in the groove over the adjacent main windings 21 and 41, respectively, so that the auxiliary windings 22 and 42 fit exactly in the groove between the smallest coils of the main windings 21 and 41.

Here, the number of coils, the ratio of the number of coils between the main winding and the auxiliary winding, and the insertion groove pitch of the winding will be described.

Regarding the number of coils Now, let K be the number of grooves and P be the number of poles. First, the coil is divided according to the number of poles P, that is, two poles, for example, N pole and S pole for 2 poles, and 2 N poles and 2 poles for 4 poles.
Since it is divided into four poles with one S pole, the number of coils for each pole (N pole and S pole) is K / P. Next, since each coil occupies two grooves, a forward groove and a backward groove, in each pole, the actual number of coils is half the number of coils in each pole, that is, (K / P) / 2. Therefore, the number of coils for each pole in the present invention is expressed by the following general formula.

(K / P) / 2 = K / (2 × P) = groove number / (2 × pole number) When this is applied to the embodiment of FIG. 1, each of the two pole windings is as described above. The number of pole coils is the number of grooves /
(2 × number of poles) = 24 / (2 × 2) = 6, the number of coils of each pole in the 4-pole winding is the number of grooves / (2 × number of poles) = 24 / (2 ×
4) = 3.

Regarding the coil number ratio between the main winding and the auxiliary winding, the main winding and the auxiliary winding are formed by concentric windings respectively, and considering the torque generation contribution rate of the motor, The number of coils is set to 2: 1.

Regarding Insertion Groove Pitch of Winding As described above, the 2-pole winding and the 4-pole winding are divided according to the number P of each pole. Therefore, each pole (N pole or S pole)
The number of grooves that the winding can occupy is K / P.

For example, the number of grooves that can be occupied by the north pole and the south pole in the two-pole winding is K / P = 24/2 = 12. Since the main windings are formed concentrically, for example, the outermost main winding 21 of the N pole is arranged in the groove number 1 and the groove number 12. The pitch between the groove number 1 and the groove number 12 is 11. Auxiliary winding 22 as well
With respect to the above, the auxiliary winding 22 disposed on the outer side is disposed, for example, in the groove number 7 and the groove number 18.
The pitch between the groove number 7 groove and the groove number 18 groove is also 11. Therefore, in the 2-pole winding, the insertion groove pitch of the maximum concentric coil is (number of grooves in each pole-
It can be understood that it is represented by 1). In fact, in this case, the pitch is (the number of each groove is -1) = (K / P-1) = (24 / 2-
1) = 11.

The number of grooves that can be occupied by each N pole and each S pole in the 4-pole winding is K / P = 24/4 = 6. Since the main windings are formed concentrically, for example, the main winding 41 arranged on the outermost side of the N pole of the leftmost portion is arranged in the groove number 1 and the groove number 6. To be done. The pitch between the groove number 1 and the groove number 6 is 5.
Similarly, focusing on the auxiliary winding 42, one auxiliary winding 42 is arranged, for example, in the groove number 4 and the groove number 9. The pitch between the groove number 4 and the groove number 9 is likewise 5. Therefore, it can be understood that even in the four-pole winding, the insertion groove pitch of the winding in the maximum concentric coil is represented by (the number of grooves of each pole-1). Actually, in this case, the pitch is (groove number of each pole-1) = (K / P-1) =
(24 / 4-1) = 5.

From the above, the insertion groove pitch of the winding in the maximum concentric coil is generally expressed as (groove number of each pole-1) = K / P- = groove number / pole number-1. Can be understood.

In FIG. 1, one groove has, for example, a winding for two poles arranged on the upper side and a winding for four poles arranged on the lower side, so that the windings are arranged in upper and lower two layers. . That is, for example, focusing on the groove number 1, the main winding 21 for the two-pole winding is arranged on the upper side, and the main winding 41 for the four-pole winding is arranged on the lower side. Further, for example, focusing on the groove number 3, the main winding 21 of the two-pole winding is arranged on the upper side and the main winding 21 on the lower side is 4
An auxiliary winding 42 of the pole winding is arranged. Similarly, focusing on the groove number 5, for example, the auxiliary winding 22 of the two-pole winding is arranged on the upper side, and the main winding 41 of the two-pole winding is arranged on the lower side. In this way, the windings are housed in two layers in all the grooves.

Fig. 2 shows the connection diagram, and in the case of 2 poles, the auxiliary winding 22
At the poles, power supply terminals 24 and 44 are provided by connecting phase advancing capacitors 23 and 43 in series to the main winding 41, respectively.

According to the above-mentioned embodiment, only two kinds of main winding 21 for two poles or main winding 41 for auxiliary poles 22 and four windings or auxiliary winding 42 are provided in the same groove of the stator core. Since they are inserted in layers, the work of inserting the windings is facilitated, and the insulation between different types of windings can be reduced to increase the space efficiency of the groove.

In the above embodiment, the case where the number of grooves of the stator core is 24 and the number of poles is two poles / four poles is explained, but the present invention is not limited thereto.

〔The invention's effect〕

According to the present invention, in the one-to-two pole number conversion type single-phase motor, the number of coils for each pole is set to the number of grooves / (2 × number of poles), and the main winding and the auxiliary winding are set to two to one. The number of coils to be inserted into the same groove is 2 because the coils are formed in a ratio of the number of coils and are formed by concentric windings, and the pitch of the insertion grooves of these windings is set to the number of grooves / the number of poles minus 1 in the maximum coil of concentric winding. There are effects that the number of types can be reduced to facilitate the insertion work of the winding, and the insulation between different types of windings can be reduced to increase the groove space efficiency.

[Brief description of drawings]

1 is a winding diagram of an embodiment of the present invention, and FIG. 2 is a connection diagram of FIG. 21,41 …… Main winding, 22,42 …… Auxiliary winding.

Claims (1)

[Claims] 1. A one-to-two pole number conversion type single-phase motor,
Set the number of coils for each pole to the number of grooves / 2 × number of poles,
The main winding and the auxiliary winding are formed with a 2: 1 coil number ratio and concentric windings, respectively, and the insertion groove pitch of these windings is the maximum number of concentric windings and the number of grooves / number of poles-1. Characteristic pole conversion type single-phase motor.