KR20060105619A - Induction motor and method for manufacturing the same - Google Patents

Abstract

The present invention makes it possible to carry out a series of respective windings for each tooth in winding every other main winding, auxiliary winding and even deceleration winding for each tooth of the stator.

To this end, in the present invention, the yoke 21 of the stator is formed as a yoke connector 21Y in which each yoke member including teeth is bent in series with a predetermined connection means, and the yoke connector 21Y is approximately In a state of linear development, the primary winding is wound in series over each of the odd-numbered teeth through an intersection line, and the auxiliary winding is wound in series over each of the even-numbered teeth through an intersection line, and then the yoke connector ( Connect both ends of 21Y) to ring yoke.

Description

Induction motor and its manufacturing method {INDUCTION MOTOR AND METHOD FOR MANUFACTURING THE SAME}

1 is a schematic diagram showing, as a cross section, an example of an induction motor manufactured by the present invention;

2a is a first equivalent circuit diagram of an induction motor having a deceleration winding;

2b is a first equivalent circuit diagram of an induction motor having a deceleration winding;

2c is a first equivalent circuit diagram of an induction motor having a deceleration winding;

Figure 3 is a side view showing an extract of the yoke of the stator side of the induction motor,

4A is a plan view showing a yoke block constituting the yoke;

4B is a front view showing a yoke block constituting the yoke;

5 is a perspective view showing a yoke connector;

6A is an exploded view showing an upper insulator of the yoke connector;

6B is an exploded view showing a yoke block of the yoke connector;

6C is an exploded view of the lower insulator of the yoke connector;

Fig. 7A is a top view of the yoke connecting member developed in a straight line for explaining the winding method of the winding according to the first embodiment of the present invention;

7B is a front view of FIG. 7A;

7C is a bottom view of FIG. 7A,

8A to 8C are explanatory diagrams for explaining a preferable winding method of a deceleration winding in the first embodiment;

9A is a plan view of the yoke connecting member that is developed in a straight line for explaining the winding method of the winding according to the second embodiment of the present invention;

9B is a front view of FIG. 9A;

9C is a bottom view of FIG. 9A.

The present invention relates to a method of manufacturing an inner rotor type induction motor (condenser motor) used for example as a fan motor of an air conditioner, and more particularly, to a winding technology for a stator.

For example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 2001-186733), the induction motor includes a rotor having a rotational output shaft and a stator arranged coaxially on the outer circumferential side thereof. The stator has 2N teeth (N is the number of poles) protruding on the inner circumferential side of the annular yoke, and a main winding is wound around each tooth, for example, an odd number of teeth, and an auxiliary winding on an even number of teeth. It is wound up.

In addition, Patent Document 1 also describes an induction motor of a variable speed that is made shiftable by applying a deceleration winding (variable winding) to either of the teeth on which the main winding is wound or the teeth on which the auxiliary winding is wound.

As described above, in the induction motor, each of the main winding and the auxiliary winding is wound around every other tooth. However, since the yoke is formed in a ring shape, in the related art, as described in Patent Document 1, the main winding is 1 At the same time, the auxiliary winding is wound directly on the teeth between the main windings, and the main windings are connected in series, and similarly, the auxiliary windings must be connected in series. It requires huge labor and time. In the case of a variable speed induction motor having a deceleration winding, connection processing of the deceleration winding is further required.

Therefore, the object of the present invention is to make a series connection as a post-processing by making it possible to serially perform each of those windings for each tooth in winding one main winding, an auxiliary winding, and a deceleration winding for each tooth of the stator. It is to make work unnecessary.

In order to solve the above problems, the present invention includes a rotor having a rotational output shaft and a stator disposed coaxially with the outer circumferential side of the rotor, wherein the stator is 2N protruding from the inner circumferential side of the annular yoke. In the manufacturing method of the induction motor having a number of teeth (N is the number of poles), a main winding is wound around the odd numbered teeth of each of the teeth, and an auxiliary winding is wound around the even numbered teeth. A yoke connector including a series of 2N yoke members that can be bent and connected in series by a predetermined connecting means, and the main windings intersect each of the odd-numbered teeth in a state in which the yoke connector is deployed in a substantially linear shape. And winding the auxiliary winding in series through an intersecting line to each even-numbered tooth, and winding the series in series. That connects the end of a yoke of the annular and is characterized.

According to this, a yoke connecting body is formed by connecting a series of 2N yoke members including each tooth so as to be bent in a predetermined connection means in series, and the main winding is formed in each odd number of teeth while the yoke connecting body is developed in a substantially straight line shape. At the same time, winding the auxiliary winding in series through the intersection line, and winding the auxiliary winding in series through the crossing line to each even numbered tooth, and then connecting both ends of the yoke connector to the annular yoke to connect the main winding and auxiliary. The windings can be wound in series without each cutting.

As a further preferred aspect, the intersection line of the main winding is wired to one end surface side of the yoke connector, and the intersection line of the auxiliary winding is wired to the other end surface side of the yoke connector. .

According to this, the insulation characteristic of a main winding and an auxiliary winding can be improved by wiring the intersection line of a main winding to the one end surface side of a yoke connection body, and the intersection line of the auxiliary winding to the other end surface side of a yoke connection body. It can increase.

Further, the odd-numbered teeth in which the main winding is wound and / or the even-numbered teeth in which the auxiliary winding is wound are again wound in series through the intersection line again.

According to this, the induction motor of the variable speed can be efficiently produced by winding the deceleration winding in series through the intersection line again in each of the odd-numbered teeth in which the main winding is wound and / or in the even-numbered teeth in which the auxiliary winding is wound. It can be obtained easily.

Further, the main winding or the auxiliary winding is wound in series by every other tooth from the distal end tooth to the distal end tooth, and then returned to the distal end tooth without cutting the winding, and again for the deceleration winding. It is characterized by winding a series of every other tooth from the tooth to the terminal tooth.

According to this, the main winding or the auxiliary winding is wound one by one from the distal end tooth to the distal end tooth in series, and then returned to the distal end tooth without cutting the winding and terminated again from the distal end tooth for the deceleration winding. By winding a series of every other tooth to the side teeth, the potential difference between the main winding or the auxiliary winding and the deceleration winding at the leading teeth is reduced, so that no special insulation treatment is required between the windings.

The yoke connector is divided into a plurality of yoke blocks including a plurality of yoke members in one block, and the yoke members included in each of the yoke blocks are freely bent through a thin hinge, and the yoke blocks are spaced between the yoke blocks. It is characterized in that it is bent freely via an insulator that is covered by the connecting body.

According to this, the yoke connector is divided into a plurality of yoke blocks including a plurality of yoke members in one block, and the yoke members included in each yoke block are freely bent through a thin hinge, and the yoke blocks are separated between the yoke blocks. By flexibly connecting via an insulator on the connecting body, the yoke connecting body can be flexibly connected with only the parts uniquely required for the yoke.

More preferably, after connecting both ends of the yoke connector to the annular yoke, the annular yoke is solidified by mold molding.

According to this, after connecting both ends of a yoke coupling body to an annular yoke, and solidifying an annular yoke by mold shaping | molding, the vibration of the capacitor | condenser induction motor which has a deceleration mechanism especially can be reduced.

The present invention also includes an induction motor produced by this manufacturing method. That is, it includes a rotor having a rotational output shaft, and stators arranged coaxially on the outer circumferential side of the rotor, wherein the stators are provided with 2N protruding toward the inner circumferential surface side of the annular yoke (N is the number of poles). In an induction motor having a tooth and a main winding is wound around the odd-numbered tooth and an auxiliary winding is wound around the even-numbered tooth, 2N yoke members including the respective teeth are predetermined. The main winding is wound in series through an intersection line in each of the odd-numbered teeth of the yoke connector, the yoke connector connected in series by a connecting means of The auxiliary windings are wound in series by each of the teeth through a cross line.

As a further preferred aspect, the intersection line of the main winding is wired to one end surface side of the yoke connector, and the intersection line of the auxiliary winding is wired to the other end surface side of the yoke connector. .

EMBODIMENT OF THE INVENTION Next, although some embodiment of this invention is described with reference to drawings, this invention is not limited to this. The induction motor described in this embodiment has six poles and has 12 teeth. In the induction motor, the main winding and the auxiliary winding are wound around every other tooth, but in this embodiment, for convenience of explanation, the number of teeth on which the main winding is wound is an odd number, and the teeth on which the auxiliary winding is wound are even. I am doing it. Moreover, the induction motor which concerns on this embodiment is a variable speed induction motor which has a deceleration winding (variable winding).

As shown in FIG. 1, the induction motor includes a rotor 10 having a rotational output shaft 11 and a stator 20 coaxially disposed on an outer circumferential side of the rotor 10. In the present invention, the rotor 10 may have any configuration, for example, may be a cage type or a winding type.

The stator 20 has an annular yoke 21, and since the induction motor in this example is six poles, 2 x 6 = 12 teeth (T1 to T12) on the inner peripheral surface side of the yoke 21. ) Is protruded toward the rotor 10 side. In the case of four poles, eight teeth are installed.

Of the teeth T1 to T12, the main winding WM is wound around the odd-numbered teeth T1, T3, T5, T7, T9, and T11, and the even-numbered teeth T2, T4, T6, T8, T10, The auxiliary winding WA is wound around T12). In addition, dividing each tooth into an odd number and an even number indicates that the main winding and the auxiliary winding are wound around every other tooth, so that the main winding (WM) is wound around the even number and the odd number is The auxiliary winding WA may be wound around the tooth.

The induction motor further includes a deceleration winding WR for making a variable speed. There are three methods for connecting the deceleration winding WR as shown in the equivalent circuit of Figs. 2A to 2C. That is, when the deceleration winding WR is connected in series to the main winding WM as shown in FIG. 2A, and when the deceleration winding WR is connected in series with the auxiliary winding WA as shown in FIG. 2B, and FIG. 2C. As described above, each of the reduction windings WRa and WRb for the main winding and the auxiliary winding may be connected in series with the main winding WM.

In the example of FIG. 1, the deceleration winding WR is connected to the main winding WM in series as shown in FIG. 2A, and the deceleration winding WR is the same as the main winding WM. T5, T7, T9, and T11).

Each terminal A-G shown in FIG. 1 corresponds to the thing of FIG. 2A, B and G are terminals of the main winding WM, D and E are terminals of the auxiliary winding WA, and A and F are deceleration windings. It is a terminal of WR, and the capacitor | condenser C is connected between one terminal G of the main winding WM, and one terminal E of the auxiliary winding WA.

In addition, the other terminal B of the main winding WM, the other terminal D of the auxiliary winding WA, and the terminal F of the deceleration winding WR are commonly connected to each other. One end side is connected to one terminal G of the main winding WM, and the other end side of the AC power supply 1 is connected to either terminal A or F of the deceleration winding WR via the switch SW. Make it accessible. Normally, the switch SW is switched to the terminal F side, and the switch SW is switched to the terminal A side at the time of deceleration.

In the present invention, any of the main winding (WM), the auxiliary winding (WA) and the deceleration winding (WR) can be wound without winding in the middle with a winding machine not shown. Therefore, the yoke 21 is made a bendable yoke connector, and the yoke connector is placed in a straight core in a substantially straight line.

3 shows a yoke 21 before winding is performed. In order to make this yoke 21 bendable yoke connector, in this example, the yoke 21 is divided into three, and the yoke block B1 including the teeth T1 to T4 and the yoke block including the teeth T5 to T8. (B2), divided into three yoke blocks of the yoke block B3 including the teeth T9 to T12.

Since each of the yoke blocks B1 to B3 has the same configuration, the yoke block B1 is shown in Fig. 4 and the description thereof will be described. 4A is a plan view of the yoke block B1, and FIG. 4B is a front view seen from the tooth surface side, wherein reference numerals of the elements of the yoke blocks B2 and B3 corresponding to the elements of the yoke block B1 are indicated in parentheses. do.

The yoke block B1 is formed by punching an electromagnetic steel sheet with a press and stacking the predetermined number of sheets. In this case, the yoke of the yoke block B1 connects the yoke members 21a and the teeth T2 having the teeth T1. It has four yoke members, a yoke member 21b having a yoke member 21b, a yoke member 21c having a tooth T3, and a yoke member 21d having a tooth T4, and the adjacent ones are thin. It is produced in the state connected by the hinge 22. This kind of thin hinge 22 can be easily formed by inserting a notch on the opposite side, for example, with a V-shaped cut groove between each yoke member during press punching of the electromagnetic steel sheet.

Before winding, each yoke block B1 to B3 is covered with an insulator made of a synthetic resin material. According to a preferred embodiment of the present invention, each yoke block B1 to B3 is insulated from the insulator 30. ) Can be flexibly connected. The configuration will be described with reference to FIG. 6.

The insulator 30 includes an upper insulator 31 shown in FIG. 6A and a lower insulator 32 shown in FIG. 6C, which are fitted from above and below the yoke blocks B1 to B3 shown in FIG. 6B. As a result, as shown in FIG. 5, electrical insulation is applied to the winding portion of each tooth and each yoke member, and only each end surface of each tooth is exposed.

The upper insulator 31 and the lower insulator 32 both have twelve segments 33 corresponding to the yoke members 21a-211, but in this example the upper insulators 31 each have six segments 33. The upper right insulator 31R and the left upper insulator 31L which are integrally divided are divided into two parts.

In addition, the lower insulator 32 is also divided into two parts, a right bottom insulator 32R and a left bottom insulator 32L, each having six segments 33 integrally. In addition, although not shown in figure, between each segment 33, the thin hinge which consists of synthetic resins is formed.

The upper left insulator 31L and the lower left insulator 32L are covered over the yoke members 21a to 21f, and the upper right insulator 31R and the lower right insulator 32R are covered over the yoke members 21g to 21l. As a result, the yoke connecting members 21Y formed by flexibly connecting the three yoke blocks B1 to B3 can be formed.

In this invention, as shown in FIG. 7, winding is performed by making the yoke connecting body 21Y into the straight core state which developed in substantially straight line shape. 7A is a top view of the yoke connector 21Y, FIG. 7B is a front view seen from the tooth side, and FIG. 7C is a bottom view. In addition, the winding example of FIG. 7 is a case where the deceleration winding WR is connected in series with the main winding WM as shown to FIG. 1 and FIG. 2A. In the figure, the main winding WM is a solid line and an auxiliary winding ( WA) is indicated by the broken line, and the deceleration winding WR is indicated by the two-dot chain lines.

First, referring to FIG. 7A, the main winding WM (WM1 to WM6) is an odd tooth (T1) as the tip side tooth, and is wound in series every other tooth from T1 to T3, T5, T7, T9, and T11. do. At that time, the crossing line of the main winding WM passes between the guide plates 34a and 34b (see FIG. 5) formed in the even-numbered segment 33 of the upper insulator 31.

Next, the deceleration windings WR (WR1 to WR6) are wound in a series of every other tooth over an odd number of teeth T1, T3, T5, T7, T9, and T11 similarly to the main winding WM. There are two ways.

This will be explained with reference to FIG. 8. 8A is a schematic diagram showing teeth included in the yoke connector 21Y, FIG. 8B is an explanatory diagram showing a first winding method of the deceleration winding WR, and FIG. 8C is a second winding method of the deceleration winding WR. It is explanatory drawing which shows. In addition, the winding direction of the deceleration winding WR is wound so that the magnetic flux goes out in the same direction as the magnetic flux generated by the main winding WM.

First, in the first winding method of FIG. 8B, after winding the main winding WM6 to the end side teeth T11, the needle of the winding machine (not shown) is returned as it is and the reduction windings WR1 to WR6 are terminated teeth T11. ) Rolls a series of T9, T7, T5, T3 every other tooth toward the tip tooth T1. In this case, since the direction of the current flows in the direction opposite to the main winding WM, the main winding WM and the winding direction are reversed.

Next, in the second winding method of FIG. 8C, after winding the main winding WM6 to the end side teeth T11, the needle is returned to the tip side teeth T1 and the deceleration windings WR1 to WR6 are tip side teeth. From T1 to T3, T5, T7, and T9, a series of every other tooth is wound toward the terminal teeth T11. In this case, since the direction of the current flows in the same direction as the main winding WM, the main winding WM and the winding direction become the same. 7 shows this second winding method. Therefore, the first winding method reverses only the deceleration winding WR of FIG. 7.

Here, the terminal withdrawn from the front end tooth T1 of the main winding WM is called G, and the terminal withdrawn from the end side tooth T11 is referred to as B, and the terminal drawn out from the front end tooth T1 of the reduction winding WR. When the terminal is A and the terminal drawn out from the terminal teeth T1 is F, as shown in Fig. 2A, the terminal B of the main winding WM and the terminal F of the reduction winding WR are connected in common. Therefore, according to the first winding method of Fig. 8B, since the potential difference between the main winding WM1 and the deceleration winding WR6 in the tip side teeth T1 becomes very large, the insulating sheet between these windings is very large. It is necessary to attach a back.

On the other hand, according to the second winding method of Fig. 8C, since the potential difference between the main winding WM1 and the deceleration winding WR6 in the tip side teeth T1 is reduced, the insulation treatment is performed as in the first winding method. Is unnecessary, and in this sense, the second winding method of winding the deceleration winding WR after returning the needle to the tip side tooth T1 is preferable. In any case, the intersection line of the deceleration winding WR passes between the guide plates 34a and 34b of the upper insulator 31 like the main winding.

Next, for the auxiliary windings WA (WA1 to WA6), as shown in Fig. 7C, even-numbered teeth T2 are taken as the tip side teeth, and every other tooth is applied from T2 to T4, T6, T8, T10, and T12. Wind in a series. At that time, the intersection line of the auxiliary winding WA passes between the guide plates 34a and 34b formed in the odd-numbered segment 33 of the lower insulator 32.

Then, one terminal E of the auxiliary winding WA is drawn out from the tip tooth T2, and one terminal D of the auxiliary winding WA is taken out from the terminal tooth T12, and then the yoke Both ends of the connecting body 21Y are connected to each other to form an annular yoke 21. After connecting the terminals A to F as shown in Fig. 2A, the yoke members 21a to 21l are subjected to mold molding. Solidify by one. In addition, the order of connection and mold molding may be arbitrary.

Next, an example in which the deceleration winding WR is wound on the auxiliary winding WA side will be described with reference to FIG. 9. 9A is a plan view of the yoke connector 21Y, FIG. 9B is a front view as seen from the tooth side, and FIG. 9C is a bottom view.

In this case, the main windings WM WM1 to WM6 may be wound as shown in FIG. 7A. As shown in Fig. 9C, the auxiliary windings WA (WA1 to WA6) use even-numbered teeth (T2) as the front-side teeth and are wound in series every other tooth from T2 to T4, T6, T8, T10, and T12. do. In addition, the main winding WM and the auxiliary winding WA pass through the guide plates of the upper insulator 31 and the lower insulator 32, respectively.

Thereafter, the deceleration windings WR WR1 to WR6 are wound in the same direction as the auxiliary winding WA with even-numbered teeth as in the auxiliary winding WA. As described above, after winding the auxiliary winding WA6 to the end side teeth T12, it is preferable to return the needle of the winding machine (not shown) to the tip side teeth T2, and then to wind the reduction windings WR1 to WR6. In this case, the deceleration winding WR passes through the guide plate of the lower insulator 32 like the auxiliary winding WA.

A terminal drawn out from the front end tooth T2 of the deceleration winding WR is called A, and a terminal drawn out from the end side tooth T is called F, and terminals G and B of the main winding WM and the auxiliary winding ( The terminals D and E of WA and the terminals F and A of the deceleration winding WR are connected as shown in the equivalent circuit of FIG. 2B, and the variable speed switch SW selects the terminal F, The terminal A is selected at the deceleration time, and the deceleration winding WR is connected in series with the auxiliary winding WA.

That is, in the equivalent circuits of FIGS. 2A and 2B, when the terminal A is selected by the variable speed switch SW, the deceleration winding WR is connected in series to the main winding WM in FIG. 2A, and in FIG. 2B. Since the deceleration winding WR is connected in series with the auxiliary winding WA, the voltage applied to the main winding WM or the auxiliary winding WA decreases, and at the same time, the torque decreases due to the widening of the phase angle. It turns.

The present invention also includes a case in which the reduction winding WR is wound on both the main winding WM and the auxiliary winding WA. Since the winding method may combine FIG. 7 and FIG. 9, detailed description is abbreviate | omitted and the equivalent circuit is shown in FIG. 2C. That is, in this case, as shown in Fig. 2C, the reduction winding WRa for the main winding WM and the reduction winding WRb for the auxiliary winding WA are connected in series.

According to this, by selecting the deceleration winding by the variable speed switch SW, the main winding WM and the in-phase current flow through the deceleration winding WRb for the auxiliary winding WA, thereby generating a composite magnetic flux with the auxiliary winding WA. As a result, the total magnetic flux decreases and the torque decreases, resulting in deceleration rotation.

As described above, according to the present invention, the main winding is formed in a state in which the 2N yoke members including each tooth are connected in series by a predetermined connection means so as to be bent in series. Winding the windings in series through the crossing lines on the odd-numbered teeth, and winding the auxiliary winding in series through the crossing lines on the even-numbered teeth, and connecting both ends of the yoke connector to the annular yoke. This allows the primary and secondary windings to be wound in series without cutting each tooth.

In addition, according to the present invention, the intersecting line of the main winding is wired to one end surface side of the yoke connector, and the intersecting line of the auxiliary winding is wired to the other end surface side of the yoke connector, thereby insulating characteristics between the main winding and the auxiliary winding. Can increase.

Further, according to the present invention, the induction motor of the variable speed is wound by winding the deceleration winding in series through the intersection line again to each odd-numbered tooth in which the main winding is wound and / or each even-numbered tooth in which the auxiliary winding is wound. Productivity can be obtained easily.

According to the present invention, the main winding or the auxiliary winding is wound one by one from the leading tooth to the termination tooth in series, and then the winding is returned to the leading tooth without cutting the winding. By winding a series of every other tease to the end teeth, the potential difference between the main winding or auxiliary winding at the leading teeth and the deceleration winding becomes small, which eliminates the need for special insulation between the windings.

In addition, according to the present invention, the yoke connector is divided into a plurality of yoke blocks including a plurality of yoke members in one block, and the yoke members included in each yoke block are free to bend through a thin hinge, and the yoke blocks are separated between the yoke blocks. By flexurally connecting via an insulator over the yoke connector, the yoke connector can be flexibly connected to only the parts that are inherently necessary for the yoke.

In addition, according to the present invention, by connecting both ends of the yoke connecting body to annular yoke, and solidifying the annular yoke by molding, the vibration of the condenser induction motor having the reduction mechanism can be reduced. have.

Claims (8)

A rotor having a rotational output shaft and a stator disposed coaxially on the outer circumferential side of the rotor, wherein the stator includes 2N teeth (N is the number of poles) protruding on the inner circumferential side of the annular yoke. In the manufacturing method of the induction motor having a main winding is wound around the odd-numbered teeth of each of the teeth, and an auxiliary winding is wound around the even-numbered teeth, Each of the odd-numbered teeth of the odd winding is formed in a state in which the yoke connector is linearly connected to the 2N yoke members including the teeth in series by a predetermined connection means. And winding the auxiliary winding in series through an intersecting line, and winding the auxiliary winding in series over each of the even-numbered teeth via an intersecting line, and then connecting both ends of the yoke connector to the annular yoke. Method for producing an induction motor, characterized in that. The method of claim 1, And a cross line of the main winding is wired to one end surface side of the yoke connector, and a cross line of the auxiliary winding is wired to the other end surface side of the yoke connector. The method according to claim 1 or 2, A method for manufacturing an induction motor, characterized in that the reduction winding is wound in series through an intersection line to each of the odd-numbered teeth on which the main winding is wound or at least one of the auxiliary windings on which one or more of the auxiliary windings are wound. . The method of claim 3, wherein The main winding or the auxiliary winding is wound in series by every other tooth from its leading side teeth to the terminal teeth, and then returned to the leading side teeth without cutting the windings, and again from the leading teeth for the deceleration windings. A method of manufacturing an induction motor, characterized in that winding in series of every other tooth to the terminal teeth. The method according to any one of claims 1 to 4, The yoke connector is divided into a plurality of yoke blocks including a plurality of yoke members in one block, and the yoke members included in each of the yoke blocks are freely bent through a thin hinge, and the yoke blocks are spaced apart from each other. A method of manufacturing an induction motor, characterized in that it is bent freely via an insulator covered by a yoke connector. The method according to any one of claims 1 to 5, And connecting both ends of the yoke connector to the annular yoke and then solidifying the ring yoke integrally by mold molding. A rotor having a rotational output shaft and a stator disposed coaxially on the outer circumferential side of the rotor, wherein the stator includes 2N teeth (N is the number of poles) protruding on the inner circumferential side of the annular yoke. In the induction motor having a primary winding is wound around the odd-numbered teeth of each of the teeth, and an auxiliary winding is wound around the even-numbered teeth, And a yoke connecting member which is bent in series with 2N yoke members including the respective teeth so as to be bent by a predetermined connecting means, and the main winding passes through an intersection line at each of the odd-numbered teeth of the yoke connecting body. Induction motor, characterized in that the auxiliary winding is wound in series through the intersection line in each of the even-numbered teeth of the yoke connector. The method of claim 7, wherein Induction motor, characterized in that the intersection line of the main winding is wired to one end surface side of the yoke connector, and the intersection line of the auxiliary winding is wired to the other end surface side of the yoke connector.

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