JP3474660B2 - 3 phase motor - Google Patents

3 phase motor

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Publication number
JP3474660B2
JP3474660B2 JP812995A JP812995A JP3474660B2 JP 3474660 B2 JP3474660 B2 JP 3474660B2 JP 812995 A JP812995 A JP 812995A JP 812995 A JP812995 A JP 812995A JP 3474660 B2 JP3474660 B2 JP 3474660B2
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JP
Japan
Prior art keywords
substantially
slot
stator core
electric motor
shaped
Prior art date
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Expired - Fee Related
Application number
JP812995A
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Japanese (ja)
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JPH08205441A (en
Inventor
昭一 川又
末太郎 渋川
文男 田島
幸記 種田
良一 長沼
Original Assignee
株式会社日立製作所
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Priority to JP812995A priority Critical patent/JP3474660B2/en
Publication of JPH08205441A publication Critical patent/JPH08205441A/en
Application granted granted Critical
Publication of JP3474660B2 publication Critical patent/JP3474660B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-phase motor, and more particularly to a three-phase motor suitable for low noise, high efficiency and miniaturization.

[0002]

2. Description of the Related Art Generally, a stator of a three-phase electric motor includes a stator core having a plurality of slots, and a stator winding wound around each slot of the stator core. As a method of winding the stator winding around each slot of the stator core, for example, Japanese Patent Publication No. 5-26422 and Japanese Patent Laid-Open No. 5-30
There is one disclosed in Japanese Patent Publication No. 0687.

In the prior art, a stator winding previously wound into a desired shape is inserted from a slot opening, that is, a slit of a stator core by using a coil inserting device. Further, in the prior art, the slots of the stator core are closed type slots, first a copper rod having a substantially rectangular cross section is inserted into each slot of the stator core, and then both ends of the copper rod are connected to the legs of the crossover member. The stator winding is formed by connecting the copper rods to each other by connecting to each other.

[0004]

However, the above-mentioned prior art has the following problems. Generally, in a motor driven by a large current, the conductor wire diameter forming the stator winding becomes thicker, but in order to insert such a stator winding into the slot by the above-mentioned conventional method,
For example, it is necessary to use an open slot, and the width of the slot opening, that is, the slit must be increased. However, if the slit width is increased, the harmonic magnetic flux in the void portion increases, and a current containing harmonics flows through the rotor bar on the secondary side. Since this harmonic current does not contribute to torque, rotor loss due to harmonic current (secondary copper loss)
Cause a decrease in the efficiency of the electric motor and an increase in the temperature, which lowers the reliability of the electric motor such as a decrease in the life of the bearing and is a major cause of noise generation.

On the other hand, generally, in a motor of several thousand rotations, the required number of windings of the stator winding is required. Therefore, the stator winding must be inserted through the slit as in the above-mentioned conventional method. However, in the case of an electric motor driven at high speed like an electric motor for driving an electric vehicle, the number of turns (the number of turns) of the stator winding can be reduced to the ultimate (for example, one turn). However, the required number of conductors of the stator winding is required due to the relationship between the current density and the space factor.
Therefore, in that case, for example, one wire rod (conductor) formed in a hexagonal shape is bundled in a predetermined number and connected in parallel to form a one-turn stator winding, and the same number of wires is provided in each slot. So that the conductor of Also in this type of stator winding, the structure of the conductor portion is the same as that of the above-described required number of windings of the stator winding, and therefore the stator winding must also be inserted from the slit. Therefore, as a matter of course, the slit width becomes considerably larger than the wire diameter of the wire material that constitutes the stator winding, and the slit has an influence as described above. In addition, the stator winding configured in this way is
It is difficult to increase the number of conductors in terms of workability, productivity, etc. due to the structure in which the conductors are inserted through the gaps and the slits.
This inevitably creates gaps between the conductors, reducing the space factor in the slots, resulting in increased resistance of the stator windings, reduced motor efficiency, and increased air content in the slots. , The heat generated by the conductor is insulated by air,
Dissipation of heat deteriorates, which causes temperature rise and shortens the life of the bearing. In addition, if the number of conductors in the stator windings is increased to increase the space factor and you try to force it from the axial direction of the slot, the conductors may be partially crushed, insulation between coils may be defective, or disconnection may occur. Such phenomenon occurs,
Variations in resistance occur between the stator windings of each phase, variations in characteristics due to unbalanced currents, and increase in noise occur, which significantly reduces workability.

Further, in the prior art, since the slots of the stator core are closed slots and the stator windings are made of copper rods having a substantially rectangular cross section, rotor loss is increased due to the influence of the slits. However, the problem that the temperature of the stator winding rises due to the large number of gaps in the slots is solved. However, since the copper rods need to be connected to each other by the crossover members at both ends of the copper rods, the number of connection points increases and the contact resistance of the connection portion increases. Further, both ends of the copper rods have to be extended in the axial direction of the stator core in order to connect the copper rods to each other, and the winding length (coil end length) of the stator winding increases. As a result, the winding resistance of the stator winding increases, and therefore the copper loss (I 2 R loss: I is the winding current, R is the winding resistance) of the armature winding also increases, and the motor efficiency decreases. . In addition, since there are many connecting points between the conductors, heat generation at the connecting portions, increase in insulation treatment, and the like occur, and there is a problem that reliability decreases.

An object of the present invention is to provide a three-phase electric motor having high motor efficiency and high reliability.

[0008]

In order to achieve the above object, the present invention is directed to a stator core having a plurality of open slots radially inward and wound around each slot of the stator core. And a stator winding, the stator winding is substantially U-shaped with one conductor bent into a U-shape and the U-shaped leg portion having a substantially rectangular cross-sectional shape. Consists of conductors, and multiple U-shaped conductors for each phase in the circumferential direction
So as to be connected in series, the leg portions of the substantially U-shaped conductor are axially inserted into the slots of the stator core,
The leg portions are connected to the leg portions of the substantially U-shaped conductor inserted in different slots via a connecting conductor.

In order to achieve the above object, the present invention provides a stator core having a plurality of closed type slots that do not open inward in the radial direction, and a stator winding wound around each slot of the stator core. A three-phase electric motor having a wire, wherein the stator winding is formed of a substantially U-shaped conductor in which one conductor is bent into a U-shape and the U-shaped leg portion has a substantially rectangular cross-sectional shape. , Multiple U-shaped conductors for each phase in the circumferential direction
So as to be connected in series, the leg portions of the substantially U-shaped conductor are axially inserted into the slots of the stator core,
The leg portions are connected to the leg portions of the substantially U-shaped conductor inserted in different slots via a connecting conductor.

In the above three-phase electric motor, preferably, the width of the leg portion of the substantially U-shaped conductor is larger than the slit width of the opening of the open type slot.

Further, preferably, the width of the leg portion of the substantially U-shaped conductor is substantially equal to the width of each slot of the stator core on the radially inner side.

Further, preferably, all the leg portions of the substantially U-shaped conductor are inserted into the respective slots of the stator core from the same side in the axial direction.

Also, preferably, the substantially U-shaped conductor is 1
One conductor and one turn of stator winding is composed of this conductor,
Two different U-shaped conductors are provided in each slot of the stator core.
The legs of the book are arranged in two layers, upper and lower.

Preferably, a plurality of leg portions of different substantially U-shaped conductors are arranged in upper and lower layers in each slot of the stator core, and a cross section of each leg portion of the substantially U-shaped conductor is provided. The shape is a substantially trapezoidal shape that has the same cross-sectional area and conforms to the slot shape in which each leg portion is located.

[0015]

In the three-phase motor of the present invention constructed as described above, the stator winding is formed of a substantially U-shaped conductor in which one conductor is bent into a U-shape. When different U-shaped conductors are connected to each other via a coil, the number of connection points is reduced as compared with the prior art in which the stator winding is formed of a copper rod, and the axial space of the U-shaped conductor for the connection is reduced. Since the number is also small, the winding length of the stator winding becomes short. This reduces the winding resistance of the stator winding, reduces the copper loss of the armature winding, and improves motor efficiency. Further, since the number of connecting points between the conductors is reduced as described above, heat generation and insulation treatment of the connecting portions are also reduced, the reliability is improved, and the work of forming the stator winding is facilitated, and the cost is reduced. There are advantages such as low cost. Further, by inserting the leg portion of the substantially U-shaped conductor into each slot of the stator core from the axial direction, when using the stator core having the open type slots, the width of the leg portion of the substantially U-shaped conductor is used. The width of the slit at the opening of the slot can be made sufficiently small, or a stator core having a closed slot can be used, which reduces rotor loss due to the slit and improves reliability. Noise is reduced. Further, since the U-shaped leg portion of the above-mentioned U-shaped conductor has a substantially rectangular cross-sectional shape, the space factor in the slot can be increased, and as a result, the resistance of the stator winding is reduced. As a result, the motor efficiency is increased, the thermal conductivity of the stator winding is improved, and the temperature rise of the stator winding is reduced.

When using a stator core having an open type slot, the width of the leg portion of the substantially U-shaped conductor is made larger than the slit width of the opening of the open type slot, or each of the stator cores is made wider. When the stator core having a closed type slot is used by making it approximately equal to the width of the inner side of the slot in the radial direction, the width of the leg portion of the substantially U-shaped conductor is set to the inner side in the radial direction of each slot of the stator core. By making the width almost equal, the space factor in the slot is increased, which reduces the resistance of the stator winding, improves the motor efficiency, and improves the heat transfer performance of the stator winding. The temperature rise of the stator winding is further reduced.

Further, by inserting all the leg portions of the substantially U-shaped conductor into the respective slots of the stator core from the same side in the axial direction, it is possible to connect different substantially U-shaped conductors to each other through the conductor for connection. Only one side of the stator in the axial direction is required, and the axial space of the substantially U-shaped conductor for its connection is also present only on that side, which shortens the motor in the axial direction, Can be downsized.

Further, the cross-sectional shape of each leg portion of the substantially U-shaped conductor is a substantially trapezoidal shape having the same cross-sectional area and conforming to the slot shape in which each leg portion is located. It is possible to make it higher, the resistance of the stator winding becomes smaller, the motor efficiency becomes higher, the heat conduction performance of the stator winding becomes better, and the temperature rise of the stator winding is further reduced. .

[0019]

Embodiments of the present invention will be described below with reference to the drawings. First, an embodiment of the present invention will be described with reference to FIGS. The three-phase motor of this embodiment is the induction motor 1,
The induction motor 1 includes a stator 2 as shown in FIG. The stator 2 includes a housing 9, a stator core 4 fixed to the inner peripheral surface of the housing 9, and a stator core 4
And a stator winding 5 wound around the. A rotor 3 is arranged with a certain gap from the stator 2, the rotor 3 is provided with a shaft 8, a rotor core 6 made of, for example, a laminated silicon steel plate and made of laminated silicon steel, and a conductor. 71 and end cages 721 and 722. Further, the shaft 8 includes bearings 11 and 111 and end brackets 10 and 101.
It is rotatably held by the stator 2.

As shown in FIG. 2, the stator core 4 of the stator 2 has twelve open slots 12 which are open radially inward.
And a stator winding 5 is housed in each slot 12. As shown in FIG. 3, this stator winding 5 has U
It is a three-phase stator winding consisting of three phases, V phase and W phase, one end is motor terminal U, V, W, and the other end is neutral point UN, VN, WN.
Has become. Neutral points UN, V of U phase, V phase, W phase
N and WN are commonly connected, and motor terminals U, V and W are connected to a driving power source such as an inverter. The stator core 4 and the stator windings 5 collectively form a three-phase four-pole.

As shown in FIG. 4, the stator winding 5 is formed by bending one conductor into a substantially U-shape and forming a U-shaped leg portion 5a,
A substantially U-shaped conductor 5A having a substantially rectangular (quadrangular) cross section, for example, a substantially rectangular cross-section, and a connecting conductor 5B for connecting different substantially U-shaped conductors 5A to each other in a predetermined relationship, and a substantially U-shaped conductor 5A. The leg parts 5a and 5b of the stator core 4 are axially inserted into the slots 12 of the stator core 4 and
a and 5b are connected to the leg portions 5a and 5b of the substantially U-shaped conductor 5A inserted in different slots 12 via the connecting conductor 5B. The leg portions 5a, 5 of the substantially U-shaped conductor 5A
b is provided with terminal portions 5c and 5d.
Different substantially U-shaped conductor 5 by connecting the connecting conductor 5B to 5d
A is connected to each other, the motor terminal U of the stator winding 5,
Connect to V, W and neutral points UN, VN, WN.

The substantially U-shaped conductor 5A, as shown in FIG.
The stator winding 5 of one pole and one turn is configured by one conductor, and the two leg portions 5a and 5b of the different substantially U-shaped conductor 5A are arranged in the upper and lower two layers in each slot 12 of the stator core 4. It is located in. In addition, the substantially U-shaped conductor 5A includes leg portions 5a,
The width H of 5b is larger than the slit width S of the opening 12a of the slot 12 and is substantially equal to the width K of each slot 12 on the radially inner side. Needless to say, the cross-sectional areas of the leg portions 5a and 5b are the same.

The operation of forming the stator winding 5 is shown in FIGS. 6 and 7 are diagrams in which FIG. 2 is developed on a plane for the sake of easy understanding, and only the U-phase stator winding 5 is shown. As shown in FIG. 6, the substantially U-shaped conductor 5A is subjected to a predetermined connection after the leg portions 5a and 5b are all inserted into the slots 12 from the same axial side of the stator core 4.

That is, one leg portion 5a of the leg portions 5a and 5b of one substantially U-shaped conductor 5A has a U phase (1).
Slot 12 of the U'phase (4), and the other leg portion 5b is housed inside the slot 12 in the radial direction (on the side of the opening 12a).
It is stored on the outer side in the radial direction of 2 (on the side opposite the opening). Similarly,
Of the leg portions 5a and 5b of one substantially U-shaped conductor 5A, one leg portion 5a is housed inside the slot 12 of the U'phase (4) in the radial direction, and the other leg portion 5b is the U phase ( 7) is radially outside the slot 12 and is one of the leg portions 5a and 5b of the one substantially U-shaped conductor 5A.
a is housed inside the slot 12 of the U phase (7) in the radial direction, and the other leg portion 5b is a slot 1 of the U'phase (10).
2, one leg portion 5a of the leg portions 5a, 5b of one substantially U-shaped conductor 5A is placed radially inside the U'phase (10) slot 12, and the other one The leg portion 5b is housed outside the U-phase (1) slot 12 in the radial direction. Although not shown, the V phase and the W phase are also configured by the same method. Slot 1 of stator core 4
The end portions of the leg portions 5a and 5b of the substantially U-shaped conductor 5A inserted in the axial direction 2 are molded along the stator core 4 and, for example, as shown in FIG. Make the conductor 5A. In the terminal portions 5c and 5d of the molded substantially U-shaped conductor 5A, for example, the connecting conductor 5B is arranged so that the winding directions of the adjacent substantially U-shaped conductors 5A are opposite to each other.
Are connected and connected in series. In this way, U
Phase, V phase, and W phase stator windings 5 are formed, respectively.

Incidentally, as shown in FIG. 8, a substantially U-shaped conductor 50 is provided.
Leg portions 50a, 50b of the U-phase (7) slot 12 and the U'-phase (10) slot 12 respectively.
The central portion 50f of the substantially U-shaped conductor 50 may be formed in a step shape in advance so that the central portion 50f can be completely inserted radially inward.

According to the three-phase electric motor of the present embodiment having the above-mentioned structure, the stator windings 5 for each of the U phase, V phase and W phase are provided.
Is a substantially U-shaped conductor 5 in which one conductor is bent into a U-shape
And the leg portions 5a, 5 of the substantially U-shaped conductor 5A.
All b are inserted into each slot 12 of the stator core 4 from the same side in the axial direction, the connecting conductor 5B is connected to the terminal portion 5a of the substantially U-shaped conductor 5A, and different substantially U-shaped conductors 5A have a predetermined relationship. Since the U-shaped conductors 5A are connected to each other only on one side in the axial direction of the stator 2, the connecting point is different from the case where the stator winding is formed using a copper rod. Is half, and a substantially U-shaped conductor 5 for the connection
Since the space in the axial direction of A is half, the winding length (coil end length) of the stator winding 5 is shortened. Therefore, the winding resistance of the stator winding 5 is reduced, and the copper loss (I 2 R loss: I is the winding current, R is the winding resistance) of the cage winding 7 of the rotor 3 is also reduced, Motor efficiency increases. Further, since there are few connection points between the substantially U-shaped conductors 5A, heat generation and insulation treatment of the connection portions are reduced, reliability is improved, and the work of forming the stator winding 5 is facilitated. There are advantages such as low cost. Further, the axial space of the substantially U-shaped conductor 5A for connecting the substantially U-shaped conductors 5A is present only on one side of the stator 2 in the axial direction, and the induction motor 1 is axially arranged. It can be shortened and downsized.

Further, as shown in FIG. 9 and FIG. 10, when the stator winding 55 is constructed by connecting a plurality of round wire materials in parallel, even if they are wound in an aligned manner, there is a space between the wires. It is inevitable that you can do it. Actually, since aligned winding is difficult due to workability, productivity, reliability of wire rod crushing and insulation failure, etc., the space between the wires increases and the space factor in the slot 12 decreases.

On the other hand, in this embodiment, the stator winding 5 is composed of a single conductor, and the U-shaped leg portions 5a and 5b are composed of a substantially U-shaped conductor 5A having a substantially rectangular cross section. Since the width of the leg portions 5a and 5b of the substantially U-shaped conductor 5A is larger than the slit width S of the opening 12a of the slot 12 and is substantially equal to the radially inner width K of each slot 12 of the stator core 4, It is possible to improve the space factor in the stator 12, and thus the resistance of the stator winding 5 is reduced, the motor efficiency is increased, and the thermal conductivity of the stator winding 5 is improved. The temperature rise of the winding 5 is reduced.

Further, the leg portion 5a of the substantially U-shaped conductor 5A,
Since 5b is inserted into each slot 12 of the stator core 4 from the axial direction, the slit width S is larger than the width H of the substantially U-shaped conductor 5A.
Can be made sufficiently small, whereby the rotor loss due to the slit 12a is reduced, the reliability is improved and the noise is reduced.

As described above, according to this embodiment, the winding resistance of the stator winding 5 is reduced and the motor efficiency is increased. Further, heat generation, insulation treatment, etc. of the connecting portion of the substantially U-shaped conductor 5A and the connecting conductor 5B are reduced, the reliability is improved, the work of forming the stator winding 5 is facilitated, and the cost is reduced. And so on. Further, the induction motor 1 is shortened in the axial direction, and the size can be reduced.

Further, the space factor in the slot 12 is improved,
The motor efficiency is increased and the temperature rise of the stator winding 5 is reduced. Further, rotor loss due to the slit 12a is reduced, reliability is improved, and noise is reduced.

Another embodiment of the present invention will be described with reference to FIGS. The stator winding of this embodiment, as shown in FIGS. 11 and 12, is substantially U-shaped and is housed in the slot 12.
The cross-sectional shape of the leg portions 51a and 51b of the character-shaped conductor 51 is
Each leg portion 51a, 51b is formed into a substantially trapezoidal shape that matches the shape of the slot 12 in which the cross-sectional shape differs depending on the radially inner side and the radially outer side of the slot 12. That is, the cross-sectional shape of the leg portion 51a accommodated inside the slot 12 of the substantially U-shaped conductor 51 and the cross-sectional shape of the leg portion 51b accommodated outside the slot 12 in the radial direction have the same cross-sectional area. The shape is made different according to the shape of the slot 12, and the leg portion 51a,
The cross-sectional shape of 51b is configured so as to substantially match the slot shape. The leg portions 51a and 51b of the substantially U-shaped conductor 51 having such a cross-sectional shape are shown in FIG.
As shown in FIG. 5, the round wire material is obtained by compression molding into a substantially trapezoidal shape, and the leg portions 51a and 51b of the substantially U-shaped conductor 51 are axially inserted into the slots 12 of the stator core 4. As a result, the above configuration is obtained.

According to this embodiment, since the space factor in the slot 12 becomes higher, the resistance of the stator winding becomes smaller, the motor efficiency becomes higher, and the heat conductivity of the stator winding becomes higher. The temperature rise of the stator winding is further reduced.

Still another embodiment of the present invention will be described with reference to FIG. In this embodiment, instead of the stator core 4 having the open type slot 12, a stator core 41 having a closed type slot 120 without slit is used, and the leg portion 5a of the substantially U-shaped conductor 5A of the stator winding 5 is 5b is inserted into the slot 120 of the stator core 41 from the axial direction. In this, the leg portion 5 of the substantially U-shaped conductor 5A
Making the width H of a and 5b approximately equal to the width K of the inside of each slot 12 in the radial direction is the same as the embodiment using the stator core 4 having the open slot 12 described above.

According to this embodiment, the rotor loss due to the slit is eliminated, the reliability is further improved and the noise is reduced.

In the above embodiment, the substantially U-shaped conductor 5A; 51 of the stator winding 5 is composed of one conductor which is a single wire. However, the present invention is not limited to this. It is also possible to collect a number of round wires or flat wires and shape them into one conductor. In this case, the high frequency resistance is reduced and the motor efficiency is improved.

Each slot 1 of the stator core 4; 41
2; 120 has a configuration in which two leg portions 5a, 5b; 51a, 51b of different substantially U-shaped conductors 5A; 51 are arranged in upper and lower two layers, but not limited to this, a plurality of different substantially U-shaped conductors The leg portions of the book may be arranged in a plurality of upper and lower layers. In this case, the cross-sectional shape of each leg portion of the substantially U-shaped conductor is a substantially trapezoidal shape having the same cross-sectional area and adapted to the shape of the slot in which each leg portion is located.

The substantially U-shaped conductor 5A of the stator winding 5;
All of the leg portions 5a, 5b; 51a, 51b of 51 are slot 12; 12 from one side of the stator core 4; 41 in the axial direction.
Although the case of inserting into 0 is shown, for example, when operating by switching the rotation speed for high speed and low speed by two inverters, a stator winding for high speed drive and a stator winding for low speed drive , And may be separately inserted into the slots 12; 120 from both the axial directions of the stator cores 4; 41. In this case, by pulling out the lead wires of the stator winding of the electric motor to the left and right and connecting them to the left and right inverters, respectively, when used for driving an electric vehicle, the weight of the electric vehicle can be balanced and the inverter can also be moved left and right. Due to the arrangement, the heat generated by the inverter can be dispersed and the wiring to the inverter can be performed in the shortest distance.

Although the present invention has been described in the case of being applied to a rotary induction motor, the present invention is not limited to this.
The same effect can be obtained when applied to a linear type linear motor. It can also be applied to a synchronous motor, in which case the effect of reducing the cogging torque acting between the magnetic poles of the stator and the permanent magnet rotor can be obtained.

[0040]

According to the present invention, the stator winding is formed of a substantially U-shaped conductor in which one conductor is bent into a U-shape and the U-shaped leg portion has a substantially rectangular cross section. Therefore, the winding resistance of the stator winding is reduced, the copper loss of the armature winding is also reduced,
As the motor efficiency increases, the number of connecting points between the conductors decreases, and the reliability increases.

[Brief description of drawings]

FIG. 1 is a sectional view of a three-phase induction motor to which the present invention is applied.

FIG. 2 is a sectional view of a stator according to an embodiment of the present invention.

FIG. 3 is a wiring example of a three-phase induction motor to which the present invention is applied.

4 is an example of a substantially U-shaped conductor forming the stator winding shown in FIG.

5 is an enlarged cross-sectional view of the stator shown in FIG.

6 is a developed plan view of the insertion of the substantially U-shaped conductor shown in FIG.

7 is a connection example of the U-phase stator winding shown in FIG.

FIG. 8 is another example of the substantially U-shaped conductor shown in FIG.

FIG. 9 is a cross-sectional view of a stator and a schematic view of the stator winding when a plurality of round wire rods are bundled in parallel to form a stator winding.

10 is an enlarged view of a stator winding portion shown in FIG.

FIG. 11 is an example for realizing a stator winding according to another embodiment of the present invention.

12 is an enlarged sectional view of a stator having the stator winding shown in FIG.

FIG. 13 is an enlarged sectional view of a stator according to still another embodiment of the present invention.

[Explanation of symbols]

1 3-phase induction motor 2 stator 4 Stator core 5 Stator winding 5A substantially U-shaped conductor 5B connection conductor 5a, 5b Leg part 12 slots 12a Slot opening (slit) 41 Stator core 51 U-shaped conductor 51a, 51b Leg part

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Koki Taneda, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. Production Technology Research Laboratory (72) Inventor Suetaro Shibukawa 2520, Takaba, Hitachinaka City, Ibaraki Prefecture Hitachi, Ltd. Automotive Equipment Division (56) References JP-A-4-244752 (JP, A) JP-A-3-155358 (JP, A) Actual development Sho-49-41201 (JP, U) (58) Survey Selected fields (Int.Cl. 7 , DB name) H02K 3/12 H02K 17/12

Claims (7)

(57) [Claims]
1. A three-phase electric motor comprising: a stator core having a plurality of open slots radially inwardly opening; and a stator winding wound around each slot of the stator core. The sub-winding is composed of a substantially U-shaped conductor in which one conductor is bent into a U-shape and the U-shaped leg portion has a substantially rectangular cross-sectional shape, and the leg portion of the substantially U-shaped conductor is described above. Inserted axially into each slot of the stator core ,
It is characterized in that the leg portions are connected to the leg portions of the substantially U-shaped conductors inserted in different slots through the connecting conductors so that the U-shaped conductors are connected in series in the circumferential direction. Three-phase electric motor.
2. A three-phase electric motor comprising: a stator core having a plurality of closed slots that do not open radially inward; and a stator winding wound around each slot of the stator core. The sub-winding is composed of a substantially U-shaped conductor in which one conductor is bent into a U-shape and the U-shaped leg portion has a substantially rectangular cross-sectional shape, and a plurality of U-shaped conductors are provided for each phase. Straight in the circumferential direction
The leg portions of the substantially U-shaped conductor are axially inserted into the slots of the stator core so as to be connected to the rows, and the leg portions of the substantially U-shaped conductor are inserted in different slots. A three-phase electric motor characterized in that it is connected to a portion via a connecting conductor.
3. The three-phase electric motor according to claim 1, wherein the width of the leg portion of the substantially U-shaped conductor is larger than the slit width of the opening of the open type slot.
4. The three-phase electric motor according to claim 1 or 2, wherein the width of the leg portion of the substantially U-shaped conductor is substantially equal to the width of each slot of the stator core in the radial direction. Three-phase electric motor.
5. The three-phase electric motor according to claim 1 or 2, wherein the leg portions of the substantially U-shaped conductor are all inserted into the respective slots of the stator core from the same side in the axial direction. A three-phase electric motor.
6. The three-phase electric motor according to claim 1 or 2, wherein the substantially U-shaped conductor constitutes a stator winding with one pole and one turn by one conductor, and each slot of the stator core. A three-phase electric motor in which two leg portions of different substantially U-shaped conductors are arranged in upper and lower two layers.
7. The three-phase electric motor according to claim 1, wherein a plurality of different leg portions of substantially U-shaped conductors are arranged in upper and lower layers in each slot of the stator core. A three-phase electric motor, wherein each leg portion of the character-shaped conductor has a substantially trapezoidal cross-sectional shape, which has the same cross-sectional area and conforms to the slot shape in which each leg portion is located.
JP812995A 1995-01-23 1995-01-23 3 phase motor Expired - Fee Related JP3474660B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP812995A JP3474660B2 (en) 1995-01-23 1995-01-23 3 phase motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP812995A JP3474660B2 (en) 1995-01-23 1995-01-23 3 phase motor

Publications (2)

Publication Number Publication Date
JPH08205441A JPH08205441A (en) 1996-08-09
JP3474660B2 true JP3474660B2 (en) 2003-12-08

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Cited By (3)

* Cited by examiner, † Cited by third party
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