JP2001204161A - Induction motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance motor efficiency by reducing, in an induction motor, the number of windings (number of coils) to reduce the number of manufacturing processes and also by enlarging short-node winding coefficient in the centralized winding. SOLUTION: In an induction motor where a stator having 3n teeth is allocated at the external circumference of a rotor of 2n poles, the main windings 4a, 4b and auxiliary windings 5a, 5b, which are concentratedly wound through insulation of tooth 3 of the stator 1 where n=2, are provided in the same polarity to the teeth 3 in every other three slots. The main windings 4a, 4b are connected in series and the auxiliary windings 5a, 5b are also connected in series, moreover a capacitor is also connected in series, this serial circuit and the serial circuit of the main windings 4a, 4b are connected in parallel, the AC power source is supplied to the parallel circuit to give spatial electrical phase angle of 120 degrees (2π/3) to the relationship between the main windings 4a, 4b and auxiliary windings 5a, 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner rotor type induction motor (condenser motor) used for a fan motor or the like of an air conditioner, and more particularly, to improve the efficiency of the motor by devising the shape of a stator. The present invention relates to an induction motor configured as described above.

[0002]

2. Description of the Related Art This induction motor comprises a rotor having a cage structure and a stator located around the rotor. 2n
In a pole (n; positive integer) induction motor, the stator usually has 4n grooves and is subjected to distributed winding of coils (coils).

The induction motor has two poles and four poles.
In general, capacitor motors having poles, 6 poles, and 8 poles are used. In the case of a 2n-pole capacitor motor, 4n windings (main windings and auxiliary windings) are formed through a predetermined number of slots. It is applied as a distributed winding to a number of teeth.

The windings of the induction motor are connected in series or in parallel. For example, an auxiliary winding is provided at a spatial phase angle of 90 degrees from the main winding. In general, a system in which a phase-advancing capacitor is inserted in series is used.

However, in the above induction motor, as the number of poles increases, the number of windings (number of coils) increases, and accordingly, the number of processing steps increases. More specifically, the number of steps such as coil winding, coil inserter, shaping, insulation, and lacing increases, resulting in an increase in manufacturing cost.

On the other hand, in an induction motor in which the windings are concentrated winding, 4n windings are applied to 4n teeth. In this case, since it is sufficient to wind a coil around each tooth, there is an advantage that the number of steps can be reduced as compared with the distributed winding.

[0007]

However, in the above-described induction motor, when concentrated winding is used, the short winding factor is as small as 45 ° sin, which is not preferable in terms of motor efficiency. This is because not only the efficiency of the motor is lower than in the distributed winding method, but also vibration and noise are increased.

The present invention has been made in view of the above problems, and has as its object to reduce the number of windings (the number of coils) to reduce processing man-hours and the like, and to increase the short-section winding coefficient by concentrated winding. It is an object of the present invention to provide an induction motor capable of improving motor efficiency and reducing the cost by reducing the amount of copper wire used.

[0009]

To achieve the above object, an induction motor according to the present invention comprises a stator having 3n (n: positive integer) teeth on the outer periphery of a rotor.
A main winding and an auxiliary winding which are concentratedly wound by insulating the teeth of the stator are provided so as to have the same polarity on different teeth every three slots, and the main winding and the auxiliary winding are connected to each other. It is characterized in that it has an electrical phase angle of 120 degrees (2π / 3) spatially.

In this case, the auxiliary winding and the capacitor are connected in series, the series circuit and the main winding are connected in parallel, and AC power is supplied to the parallel circuit. It is preferable to connect the main winding and the capacitor in parallel, connect the parallel circuit and the auxiliary winding in series, and supply AC power to the series circuit of the main winding and the auxiliary winding and the capacitor. .

When n is 2 or more, the two or more windings constituting the main winding and the auxiliary winding may be connected in series or connected in parallel.
According to this, particularly when the main winding and the auxiliary winding are connected in parallel, even if there is a variation in the air gap (air gap) between the stator and the rotor, the variation is canceled. You can balance.

The induction motor according to the present invention has three
A stator having n (n: positive integer) teeth is arranged, and a main winding and an auxiliary winding, which are concentratedly wound by insulating the stator teeth, are provided with different teeth every three slots. The main winding and the auxiliary winding are spatially set to have an electrical phase angle of 120 degrees (2π / 3), and a common winding is placed at three slots on the remaining teeth of the stator. The common winding and the main winding and the auxiliary winding are spatially arranged to have an electrical phase angle of 60 degrees (π / 3).

The auxiliary winding and the capacitor are connected in series, the series circuit and the main winding are connected in parallel, and the parallel circuit and the common winding are connected in series. In this way, the common winding, the main winding and the auxiliary winding are connected in a star shape, and the main winding, the auxiliary winding and a series circuit of the capacitor are connected to each other through the star-connected common winding. Supply power, or connect the main winding and the capacitor in parallel, connect this parallel circuit and the auxiliary winding in series, and connect this series circuit and the common winding in series. To connect the common winding, the main winding, and the auxiliary winding in a star shape, and a series circuit of the main winding and the capacitor and the auxiliary winding through the common winding connected in a star shape. It is advisable to supply AC power to the power supply.

When n is 2 or more, the main winding;
Two or more windings constituting the auxiliary winding and the common winding may be connected in series or connected in parallel.
According to this, similarly to the above, when the main winding and the auxiliary winding are connected in parallel, even if there is variation in the air gap (air gap) between the stator and the rotor, the variation is reduced. You can balance them out.

[0015]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. 1 to 8, the same portions are denoted by the same reference numerals, and redundant description will be omitted.

The induction motor of the present invention is a capacitor motor having a structure of 2n poles and 3n grooves (slots; 3n teeth) (n: a positive integer). The induction motor according to the first embodiment of the present invention is a 4-pole, 6-slot condenser motor having a 6-slot stator on the outer peripheral side of the rotor.

In FIG. 1, the stator 1 of the induction motor is shown.
Is provided with six teeth 3 protruding from the yoke part 2 to the center at equal intervals in the circumferential direction, applying insulation to the teeth 3 every three slots to apply the concentrated winding main windings 4a, 4b, and Auxiliary windings 5a, 5b of concentrated winding are applied by insulating the teeth 3 at different three slots, and the relationship between the main windings 4a, 4b and the auxiliary windings 5a, 5b is spatially electric as described later. The phase angle is 120 degrees (2π / 3). Note that a rotor 6 having, for example, a cage structure is disposed inside the stator 1.

Main windings 4a, 4b and auxiliary windings 5a, 5
The winding directions of b are all the same so that they have the same polarity. Further, as shown in FIG. 2, a serial system is adopted for those connections. Note that reference numerals a1 to a8 shown in FIG. 2 correspond to the reference numerals in FIG.

In this case, the main windings 4a and 4b are connected in series, the auxiliary windings 5a and 5b are connected in series, and a capacitor 7 is connected in series with the auxiliary windings 5a and 5b. Then, a series circuit of the main windings 4a and 4b and a series circuit of the auxiliary windings 5a and 5b and the capacitor 7 are connected in parallel, and an AC power supply 8 is applied to this circuit. The teeth 3 between the main windings 4a, 4b and the auxiliary windings 5a, 5b are not wound. Further, the width of the yoke 2 is preferably at least half of the tooth width of the teeth 3.

According to the stator 1 having the above configuration, the main winding 4
The magnetic poles by a and 4b are the same. For example, if the magnetic field from the main winding 4a is N-pole, the magnetic field from the main winding 4b is also N-pole. Since the magnetic flux from the main winding 4a is distributed via the teeth 3 of the adjacent winding and the teeth 3 of the auxiliary winding 5a and the yoke portion 2 (see the broken line in FIG. 1), the magnetic flux generated by the main winding 4a is adjacent to the main winding 4a. The magnetic pole of the tooth 3, especially the tooth 3 having no winding, is always the south pole.
The magnetic flux generated by the main winding 4b is the same as the broken line in FIG.

Similarly to the main windings 4a and 4b, the magnetic poles of the auxiliary windings 5a and 5b are the same. For example, if the magnetic field from the auxiliary winding 5a is N-pole, the magnetic field from the auxiliary winding 5b is also N-pole. Since the magnetic flux generated by the auxiliary winding 5a is distributed in the same manner as the magnetic flux of the main winding 4a (see the broken line in FIG. 1), the magnetic pole of the tooth 3 adjacent to the auxiliary winding 5a, especially the tooth 3 having no winding, must be S. Become a pole. The magnetic flux generated by the auxiliary winding 5b is the same as the dashed line in FIG.

Therefore, the magnetic poles formed by the main windings 4a, 4b and the auxiliary windings 5a, 5b are spatially separated by the electric phase angle 12
It becomes 0 degrees. The main windings 4a and 4b and the auxiliary winding 5
Each of the short winding coefficients of a and 5b is sin 60 °. Then, a rotating magnetic field is generated in the stator 1 by the alternating current of the AC power supply 8, so that the rotor 6 inside the stator 1 rotates.

As described above, according to the induction motor of the present invention, it is not necessary to apply a winding to all of the teeth 3 of the stator 1, and for example, at least two windings are required in comparison with a case where a conventional concentrated winding is applied. Since the number of windings (coils) can be reduced, manufacturing costs can be reduced. In addition, the short-pitch winding coefficient becomes larger than before, that is, the effective number of turns (= the number of turns × the short-pitch winding coefficient) increases, so that the efficiency of the motor improves. In addition, the main windings 4a and 4b and the auxiliary winding 5
Since the number of turns of a and 5b can also be reduced, the amount of copper wire used can be reduced and cost can be reduced.

FIGS. 3 and 4 show another example of the first embodiment, in which a capacitor motor having 6 poles and 9 slots is shown.

In the stator 10 of this induction motor, nine teeth 12 protruding from the yoke part 11 to the center thereof are provided at equal intervals in the circumferential direction, and the teeth 12 provided at three slots are insulated to provide a main part of concentrated winding. The windings 13a, 13b and 13c are provided, and the auxiliary windings 14a, 14b and 14c of concentrated winding are provided by insulating the teeth 12 arranged at three different slots from the windings 13a, 13b and 13c. Also, as described later, the main windings 13a, 13b,
The relationship between 13c and the auxiliary windings 14a, 14b, 14c is spatially an electrical phase angle of 120 degrees.

The intermediate teeth 3 between the main windings 13a, 13b, 13c and the auxiliary windings 14a, 14b, 14c are not wound as in the previous embodiment. Further, a rotor having, for example, a cage structure is disposed inside the stator 10. Further, the width of the yoke portion 11 may be substantially ほ ぼ of the tooth width of the teeth 12.

The winding directions of the main windings 13a, 13b, and 13c and the auxiliary windings 14a, 14b, and 14c are all the same so that they have the same polarity. As shown in FIG. 4, the connection employs a series method. Note that reference numerals b1 to b12 shown in FIG. 4 correspond to the reference numerals in FIG.

The main windings 13a, 13b, 13c are connected in series, and the auxiliary windings 14a, 14b, 14c
Are connected in series, and the auxiliary windings 14a, 14b,
The capacitor 16 is connected in series with 14c. The series circuit of the main windings 13a, 13b, 13c and the auxiliary winding 14
a, 14b, 14c and a series circuit of a capacitor 15 are connected in parallel, and an AC power supply 8 is applied to this circuit.

According to the stator 10 having the above-described configuration, the same magnetic flux as that of the stator 1 of the previous embodiment is generated, and the main windings 13a, 13
The magnetic poles formed by b, 13c and the auxiliary windings 14a, 14b, 14c spatially have an electrical phase angle of 120 degrees. Also,
The main windings 13a, 13b, 13c and the auxiliary windings 14a,
14b and 14c each have a short section winding coefficient of sin 60 °
Becomes Then, a rotating magnetic field is generated in the stator 10 by the alternating current of the AC power supply 8, so that the rotor 15 inside the stator 10 rotates.

Therefore, in this embodiment, the same effect as in the previous embodiment can be obtained, and the number of windings can be reduced by three as compared with the conventional case where concentrated winding is performed. The same effect can be obtained by applying the above-described embodiment to another capacitor motor having 2n poles and 3n slots, for example, 8 poles and 12 slots.

FIGS. 5 and 6 show an induction motor according to a second embodiment, and show a 4-pole, 6-slot condenser motor. In the drawings, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted.

In the stator 20 of this induction motor, among the teeth 3 of the stator 1 shown in FIG. 1, the non-wound teeth 3 are insulated to provide concentrated windings 21a and 21b. Thus, the relationship between the main windings 4a, 4b and the auxiliary windings 5a, 5b and the common windings 21a, 21b, 21c is spatially represented by an electrical phase angle of 60 degrees (π / 3). That is, magnetic poles are formed on the unwound teeth 3 of the stator 1 shown in FIG. 1 by the magnetic field of the adjacent windings (main winding and auxiliary winding), and the magnetic field is formed by the windings. If done, the stator 20
, The magnetic field thereof, that is, the magnetic field becomes better, and the efficiency of the motor can be improved.

In this case, the winding directions of the common windings 21a and 21b are all the same as the main windings 4a and 4b and the auxiliary windings 5a and 5b so that they have the same polarity. As shown in FIG. 6, the common windings 21a and 21b, the main windings 4a and 4b
For connection of the auxiliary windings 5a and 5b, a series system is adopted. Note that reference numerals a1 to a12 shown in FIG. 6 correspond to the reference numerals in FIG.

The common windings 21a and 21b are connected to the main winding 4
a and 4b and the auxiliary windings 5a and 5b are connected in series. The series circuit of the main windings 4a and 4b and the series circuit of the auxiliary windings 5a and 5b and the capacitor 22 are connected in parallel, and the series circuit of the main windings 4a and 4b and the common windings 21a and 21b are connected. A circuit is connected in series (so-called star connection), and an AC power supply 8 is applied to this circuit.

According to the stator 20 having the above configuration, as is apparent from the connection shown in FIG. 6, the common windings 21a and 21b are opposite to the main windings 4a and 4b and the auxiliary windings 5a and 5b. That is, the magnetic flux of the common windings 21a and 21b is
a, 4b and the magnetic fluxes of the auxiliary windings 5a, 5b.

For example, when the teeth 3 of the main windings 4a and 4b are N poles, the teeth of the common windings 21a and 21b are S poles, and when the teeth of the auxiliary windings 5a and 5b are N poles, the common winding is The teeth of 21a and 21b are S poles. Accordingly, the magnetic flux distribution in the stator 20 becomes the same as that of the stator 1 shown in FIG. 1 and the density of the magnetic flux distribution is increased by the amount of the magnetic flux generated by the common windings 21a and 21b. In addition, the efficiency of the motor is higher than that of the first embodiment.

The main windings 4a and 4b and the auxiliary winding 5
The magnetic poles formed by a and 5b and the common windings 21a and 21b have a spatial and electrical phase angle of 60 degrees. Further, the common winding 21
The short-coil winding coefficients of a and 21b are sin60 ° as in the main windings 4a and 4b and the auxiliary windings 5a and 5b. And
Since a rotating magnetic field is generated in the stator 20 by the alternating current of the AC power supply 8 as in the first embodiment, the rotor 6 inside the stator rotates.

As described above, the short-coil winding factor of the common windings 21a and 21b is larger than that of the conventional winding, that is, the effective number of windings is increased, so that the efficiency of the motor is further improved. Further, since the number of turns of the common windings 21a and 21b can be reduced as in the case of the main windings 4a and 4b and the auxiliary windings 5a and 5b, the amount of copper wire used can be reduced.

If the common windings 21a and 21b are deceleration windings, speed change windings, or output adjustment windings (torque adjustment windings), the speed reduction windings, the speed change windings, or the output adjustment windings can be used. Can be easily involved, and a low-speed and high-speed motor or a low-output and high-output motor can be easily obtained. You.

FIGS. 7 and 8 show another example of the second embodiment, in which an induction motor is a capacitor motor having six poles and nine slots, and this embodiment is different from the first embodiment. It corresponds to other examples. In the drawings, the same parts as those in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description will be omitted.

The stator 30 of the induction motor has a structure in which the teeth 12 of the stator 10 shown in FIG.
31c, the main windings 13a, 13b, 13c, the auxiliary windings 14a, 14b, 14c and the common winding 3
The relationship with 1a, 31b, 31c is spatially an electrical phase angle of 60 degrees.

The winding directions of the common windings 31a, 31b, 31c are all the same as the main windings 13a, 13b, 13c and the auxiliary windings 14a, 14b, 14c so that they have the same polarity. As shown in FIG. 8, the common windings 31a, 31b, 31c and the main windings 13a, 13b, 13
For the connection between c and the auxiliary windings 14a, 14b, 14c, a series system is adopted. Note that reference numeral b1 shown in FIG.
Through b18 correspond to the reference numerals in FIG.

The common windings 31a, 31b, 31c are composed of main windings 13a, 13b, 13c and auxiliary windings 14a, 1c.
4b and 14c are connected in series. Then, a series circuit of the main windings 13a, 13b, 13c and the auxiliary windings 14a,
14b, 14c and a series circuit of the capacitor 32 are connected in parallel, and their main windings 13a, 13b, 1
3c and a series circuit of the common windings 31a, 31b, 31c are connected in series (so-called star connection), and an AC power supply 8 is applied to this circuit. 31b, 31c and windings 13a, 13b, 1
The relationship between 3c and the auxiliary windings 14a, 14b, 14c is spatially an electrical phase angle of 60 degrees.

According to the stator 30 having the above configuration, as is clear from the connection shown in FIG. 8, the common windings 31a, 31b,
31c is opposite to the main windings 13a, 13b, 13c and the auxiliary windings 14a, 14b, 14c. That is, the magnetic flux of the common windings 31a, 31b, 31c is
b, 13c and the magnetic flux of the auxiliary windings 14a, 14b, 14c.

Therefore, the magnetic flux distribution in the stator 30 is
Not only is the stator 1 shown in FIG. 4 the same, but also the density of the magnetic flux distribution is increased by the amount of the magnetic flux generated by the common windings 31a, 31b, and 31c. It is even higher than the other examples of the embodiment.

The main windings 13a, 13b, 13c and the auxiliary windings 14a, 14b, 14c and the common winding 31a,
The magnetic poles formed by the magnetic poles 31b and 31c spatially have an electric phase angle of 6
It is 0 degrees. Further, the common windings 31a, 31b,
The short-coil winding coefficient of 31c is the same as that of the main windings 13a, 13b and 13c and the auxiliary windings 14a, 14b and 14c.
0 °. Then, a rotating magnetic field is generated in the stator 30 by the alternating current of the AC power supply 8, so that the rotor 15 inside the stator 30 rotates.

As described above, the common windings 31a, 31b, 3
The short-coil winding factor of 1c is also larger than before, that is, the effective number of windings is increased, so that the motor efficiency is improved. Further, since the number of turns of the common windings 31a, 31b, 31c can be reduced correspondingly, the amount of copper wire used can be reduced.

As in the second embodiment, the common winding 3
The windings 1a, 31b, 31c are deceleration windings, speed change windings, or output adjustment windings (torque adjustment windings), so that the speed reduction winding, the speed change winding, or the output adjustment winding can be easily wound. Further, in addition to the second and other embodiments, 3n slots with 2n poles, for example,
Even when applied to an 8-pole, 12-slot condenser motor,
Similar effects can be obtained.

By the way, the connection of the above-mentioned four embodiments (see FIGS. 2, 4, 6, and 8) has been described in connection with the case where the serial system is adopted. It goes without saying that a similar effect can be obtained. In the parallel system, in the case of the first embodiment and another embodiment of the same embodiment, the main winding and the capacitor are connected in parallel, and the parallel circuit and the auxiliary winding are connected in series. AC power may be supplied to a series circuit of the main winding, the auxiliary winding, and the capacitor.

In the case of the second embodiment and another embodiment of the same embodiment, the main winding and the capacitor are connected in parallel, and the parallel circuit and the auxiliary winding are connected in series.
In addition, by connecting the series circuit and the common winding in series, the common winding, the main winding, and the auxiliary winding are connected in a star shape, and are connected via the star-connected common winding. The AC power may be supplied to the series circuit of the main winding and the capacitor and the auxiliary winding.

Further, in the above embodiment, the main winding 4
a, 4b, 13a, 13b, 13c, auxiliary windings 5a, 5
b, 14a, 14b, 14c and common winding 21a, 2
Although 1b, 31a, 31b, and 31c are connected in series, each main winding, auxiliary winding, and common winding may be connected in parallel. In this case, the stator 1, 1
Even if there is variation in the air gap (air gap) between 0 and the rotors 6 and 15, the variation can be canceled out to achieve a balance. That is, the magnetic resistance is large in a portion where the air gap is large, and the current flowing through the winding is accordingly large, and conversely, the magnetic resistance is small in the portion where the air gap is small, and the current flowing through the winding is small accordingly. is there.

[0052]

According to the present invention described above, the following effects can be obtained. The present invention relates to an induction motor in which a stator having 3n (n; a positive integer) slots is arranged on the outer periphery of the rotor. The wires are provided so as to have the same polarity on different teeth every three slots, and the relationship between the main winding and the auxiliary winding is spatially an electrical phase angle of 120 degrees (2π / 3).
Therefore, since there are teeth that are not wound, the number of coils is reduced, so that the number of processing steps and the like are reduced, and the manufacturing cost can be reduced. The short winding coefficient of each of the concentrated main winding and the auxiliary winding is sin.
Since it is as large as 60 °, there is an effect that the efficiency of the motor can be increased, and the cost can be reduced by reducing the amount of copper wire used.

In the induction motor according to the present invention, a common winding is provided at every three slots on the teeth (the remaining teeth of the stator) between the main winding and the auxiliary winding so as to have the same polarity. Since the relationship between the common winding and the main winding and the auxiliary winding is spatially set to an electric phase angle of 60 degrees (π / 3), the magnetic flux generated by the common winding causes The magnetic flux distribution is improved and the magnetic flux density is increased. In addition, the short winding factor of the common winding is as large as sin 60 °, so that the efficiency of the motor can be improved, and the cost can be reduced by using less copper wire.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an induction motor for explaining a first embodiment of the present invention.

FIG. 2 is a schematic connection diagram for explaining winding connection of a stator of the induction motor shown in FIG. 1;

FIG. 3 is a schematic plan view of an induction motor for explaining another example of the first embodiment of the present invention.

FIG. 4 is a schematic connection diagram for explaining winding connection of a stator of the induction motor shown in FIG. 3;

FIG. 5 is a schematic plan view of an induction motor for explaining a second embodiment of the present invention.

FIG. 6 is a schematic connection diagram for explaining winding connection of a stator of the induction motor shown in FIG. 5;

FIG. 7 is a schematic plan view of an induction motor illustrating another example of the second embodiment of the present invention.

FIG. 8 is a schematic connection diagram for explaining winding connection of a stator of the induction motor shown in FIG. 7;

[Explanation of symbols]

 1, 10, 20, 30 Stator 2, 11 Yoke 3, 12 Teeth 4a, 4b, 13a, 13ba, 13c Main winding 5a, 5b, 14a, 14b, 14cb Auxiliary winding 6, 15 Rotor 7, 16 , 22, 32 Capacitor 8 AC power supply 21a, 12b, 31a, 31b, 31c Common winding

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Kawai 1116, Suenaga, Takatsu-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu General Limited (72) Inventor Hidetaka Terakubo 1116, Suenaga, Takatsu-ku, Kawasaki-shi, Kanagawa Fujitsu General Limited (72) Inventor Summit Loudon Sac 1116 Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu General Co., Ltd. (72) Inventor Weapon Fampani Jaroon 1116, Suenaga, Takatsu-ku, Kawasaki City, Kanagawa Prefecture Fujitsu General Company (72) Invention Thaler Grin Chatton 1116 Suenaga, Takatsu-ku, Kawasaki-shi, Kanagawa F-term in Fujitsu General Limited 5H013 DD03

Claims (6)

[Claims] 1. A stator having a stator having 3n (n: positive integer) teeth disposed on the outer periphery of the rotor, wherein a main winding and an auxiliary winding are provided in which the stator teeth are insulated and concentratedly wound. Winding
Induction, characterized in that it is provided so as to have the same polarity in different teeth every three slots, and the main winding and the auxiliary winding are spatially set to an electrical phase angle of 120 degrees (2π / 3). Electric motor. 2. The method according to claim 1, wherein the auxiliary winding and the capacitor are connected in series, the series circuit and the main winding are connected in parallel, and AC power is supplied to the parallel circuit.
While connecting the main winding and the capacitor in parallel,
The induction motor according to claim 1, wherein the parallel circuit and the auxiliary winding are connected in series to supply AC power to a series circuit of the main winding, the auxiliary winding, and a capacitor. 3. When n is 2 or more, two or more windings constituting the main winding and the auxiliary winding are connected in series or connected in parallel.
Or the induction motor according to 2. 4. 3n pieces (n: positive integer) on the outer periphery of the rotor
A main winding and an auxiliary winding which are concentratedly wound by applying insulation to the teeth of the stator are provided so as to have the same polarity on different teeth every three slots, A spatial electric phase angle of 12
0 ° (2π / 3), a common winding is provided on the remaining teeth of the stator so as to have the same polarity every three slots, and the common winding is spatially separated from the main winding and the auxiliary winding. An induction motor having an electrical phase angle of 60 degrees (π / 3). 5. An auxiliary winding and a capacitor are connected in series, the series circuit and the main winding are connected in parallel, and the parallel circuit and the common winding are connected in series. The common winding, the main winding, and the auxiliary winding are connected in a star shape by connection, and a series circuit of the main winding, the auxiliary winding, and the capacitor is connected via the star-connected common winding. Or the main winding and the capacitor are connected in parallel, the parallel circuit and the auxiliary winding are connected in series, and the series circuit and the common winding are connected to each other. Are connected in series to connect the common winding, the main winding, and the auxiliary winding in a star shape, and a series circuit and an auxiliary circuit of the main winding and the capacitor are connected via the star-connected common winding. 5. The induction motor according to claim 4, wherein an AC power is supplied to the winding. 6. When n is 2 or more, two or more windings respectively constituting the main winding, the auxiliary winding and the common winding are connected in series or connected in parallel. Item 6. The induction motor according to item 4 or 5.