JP2002044892A - Electric motor and electric compressor mounted with this electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen connection working hours and improve efficiency in an electric motor driven at the low voltage. SOLUTION: The constitution is the electric motor equipped with the rotor, the stator having plural numbers of teeth 2 and the conductive cable 5 forming the coil by concentrating winding at teeth 2. The feature is in the use of the special material as conductive cable 5 with insulation-coated at the exterior of the core cable group bundled with the plural numbers of each core cable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric compressor mounted on an automobile or the like and a structure of the electric motor suitable for the electric compressor.

[0002]

2. Description of the Related Art Conventionally, a power supply of an electric compressor mounted on an automobile or the like has a voltage of 50 V or less. When a motor used for the electric compressor has a rotor using a permanent magnet, the number of turns of a copper wire is three. The number of turns is about 20 times, and if it is desired to increase the space factor of the copper wire in the slot area in order to improve the efficiency of the motor, it is necessary to increase the cross-sectional area of the copper wire.

[0003] From the viewpoint of power supply efficiency, the cross-sectional area of the copper wire is 5 m.
m ² or more and 10 mm ² or less and the cross-sectional area is a circle,
The diameter of the copper wire is not less than 2.5 mm and not more than 3.6 mm. However, when using a copper wire having a large diameter as described above,
In particular, when PWM control driven at a high carrier frequency is performed, current flows only on the surface of the copper wire due to the skin effect, the winding resistance increases, and the copper wire diameter (copper wire cross-sectional area) increases. The effect obtained cannot be obtained sufficiently.

In order to solve these problems, a large number of copper wires having a small diameter are bundled and wound, or one copper wire having a small diameter is wound a predetermined number of times (hereinafter referred to as "multi-holding winding"). "
), By depositing both ends at the neutral point and the input terminal and repeating the process a plurality of times, for example, winding a copper wire group of 5 mm ² or more and 10 mm ² or less a predetermined number of times. become. As a result, the effect of the skin effect has been reduced and the workability of the copper wire has been improved.

[0005]

However, in the above-described electric motor, since each copper wire having a small diameter has an insulating film, the cross-sectional area of the insulating film occupying the slot area is increased, and the space factor is increased. And, for example, 30
When the bundled copper wires are wound, 90 wires at the neutral point or 90N wires (N is the number of pole pairs) in the case of pole-parallel winding gather, so it is necessary to peel off all the insulation film. And had the disadvantage of extremely poor productivity.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a conductive member having a rotor, a stator having a plurality of teeth, and a coil formed by concentratedly winding the teeth. A motor having a core and a plurality of cores bundled together, the outer periphery of which is insulated and used as the conductive winding.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present application is directed to a rotor, a stator having a plurality of teeth, and a conductive winding having a coil formed by performing concentrated winding on the teeth. A motor, characterized in that, as the conductive winding, a motor having a core wire group in which a plurality of core wires are bundled and used for insulation coating is used, and at the time of connection, each core wire is insulated. Not required, eliminating man-hours for stripping the insulation film,
Provide a motor with good productivity.

According to a second aspect of the present invention, in the conductive winding, the total cross-sectional area of the core wire is 5 mm ² or more and 10 mm ² or less, and the conductive coil occupies a slot formed between adjacent teeth. 2. The electric motor according to claim 1, wherein the space factor of the core wire of the winding is 60% or more.

According to a third aspect of the present invention, there is provided a three-phase synchronous motor in which a U-phase conductive winding, a V-phase conductive winding, and a W-phase conductive winding are wound around teeth. The conductive winding of the coil part is formed in the teeth part by one conductive winding,
2. The electric motor according to claim 1, wherein one end of each end is connected to a neutral point and the other end is connected to an input terminal of each phase, wherein the number of connection times can be omitted, and productivity is improved.

[0010] The invention according to claim 4 of the present application is a method for connecting an end of a conductive winding to an input terminal of each phase, or a means for connecting ends of conductive windings of different phases to each other. 4. The electric motor according to claim 3, wherein caulking by a pipe or a folded plate is used, the connection can be easily performed, and the reliability is improved.

According to a fifth aspect of the present invention, a conductive adhesive is used as a means for connecting the end of the conductive winding to the input terminal of each phase or for connecting the ends of the conductive windings of different phases. 4. The electric motor according to claim 3, wherein an agent is used, and conduction between the core wires can be secured, so that the contact resistance can be reduced.

According to a sixth aspect of the present invention, in the electric motor according to the first aspect, the conductive winding is directly connected to an external power supply terminal or a connection terminal of the external power supply terminal. Can be omitted.

According to the present invention, a portion from the winding end of the conductive winding to an external power supply terminal or a connection terminal to the external power supply terminal (hereinafter referred to as "lead wire").
7. The electric motor according to claim 6, wherein the lead wire is fixed to the axial end of the conductive winding wound around the teeth with a binding string. Improve reliability.

According to the present invention, the portion from the winding end of the conductive winding to the external power supply terminal or the connection terminal to the external power supply terminal is formed by connecting the stator core and the conductive winding. 7. The electric motor according to claim 6, wherein the electric motor is guided by a groove or a key provided in a resin molded product provided for insulation (hereinafter, referred to as "insulator"). Fix the lead wire and improve the reliability of the lead wire.

According to a ninth aspect of the present invention, there is provided the electric motor according to the first aspect, wherein the diameter of the cross section of one core wire is 0.94 mm or less. There is no effective increase in winding resistance due to the effect.

According to a tenth aspect of the present invention, there is provided the electric motor according to the first aspect, wherein the material of the core wire is electrolytic copper, and the specific resistance is low and the efficiency is improved.

According to an eleventh aspect of the present invention, in the electric motor according to the first aspect, the material of the core wire is electric aluminum.
Electrolytic copper has a 0.2% proof stress of 12 kg / mm ² , whereas aluminum has a weight of 3 kg / mm ² , and has a small Young's modulus and softness. .

According to a twelfth aspect of the present invention, in the electric motor according to the first aspect, the core wire group is coated with a PET film or a PEN film. Has no adverse effect on refrigerant.

According to a thirteenth aspect of the present invention, in the electric motor according to the first aspect, the core group is covered with a braid of polyester or PPS fiber, and the winding is soft and easy to occupy. Rate can be increased.

According to a fourteenth aspect of the present invention, the core wire group has a braid of polyester or PPS fiber in a lower layer, and a polyester film or PP wound in a spiral shape in a middle layer.
2. The electric motor according to claim 1, wherein the S film and the upper layer are insulated by a braid of polyester or PPS fiber, and the insulation is complete and soft, so that the workability is good.

The invention according to claim 15 of the present application is the electric motor according to claim 1, wherein the core wire group is insulated and coated with a fluororesin or a polyolefin resin by extrusion molding. In addition, since the sliding property is good and the winding property is good, the productivity and the space factor are improved.

According to a sixteenth aspect of the present invention, there is provided the electric motor according to the first aspect, wherein the core wire group is insulated by a tube made of polyester, polyolefin, or fluororesin. Good linearity improves productivity and space factor.

[0023] The invention according to claim 17 of the present application is the electric motor according to claim 16, wherein the tube is provided with heat shrinkability, wherein the insulating film layer can be made small and the space factor can be reduced. As a result, the motor efficiency is improved.

The invention according to claim 18 of the present application is characterized in that the stator has 3N teeth and the rotor is made of a 2N-pole permanent magnet.
The electric motor according to Item, wherein the overall length of the electric motor can be reduced, and the efficiency of the electric motor is high.

According to the present invention, the current flowing through the conductive winding is rectified by the switching element, and
The electric motor according to any one of claims 1 to 18, wherein the electric current is a WM-controlled current, and in particular, an increase in effective winding resistance due to a skin effect can be suppressed.

According to the present invention, the voltage applied to the winding of the motor is 50 V or less, and the current flowing through the winding is 5 V or less.
2. The method according to claim 1, wherein the first and second electrodes are used at 0 A or more.
9. The electric motor according to any one of items 9, wherein a maximum output is around 2500 W, and air conditioning in a large vehicle is particularly possible.

[0027] The invention according to claim 21 of the present application is the electric motor according to any one of claims 1 to 20, wherein the electric motor is driven by a power supply that moves together with the electric motor. As a result, manufacturing is easy and efficiency can be improved.

The invention described in claim 22 of the present application is claim 1
21. An electric compressor for a vehicle, on which the electric motor according to any one of items 21 to 21 is mounted, which can provide a small compressor with low power consumption.

[0029]

FIG. 1 is a perspective view of a stator of an electric motor according to an embodiment of the present invention. FIG. 2 is a plan view of the electric motor according to one embodiment of the present invention. FIG. 3 is a sectional view of an electric compressor for a vehicle equipped with an electric motor according to an embodiment of the present invention.

The rotor shown in FIG. 2 does not include end plates, rivet pins, shafts, balance weights, etc., so that the rotor structure can be easily understood.

FIG. 3 shows only parts related to the electric motor, and other parts, for example, a compressor section and the like are omitted.

The stator 1 is formed by winding a three-phase direct conductive winding 5 around a tooth 2 via a stator core 3 having six teeth 2 via an insulating film 4 for insulating slots.

The rotor 11 is a four-pole permanent magnet type,
A permanent magnet 13 is embedded in the rotor core 12, and the magnetic poles of the permanent magnet are magnetized such that N poles and S poles are alternately arranged. End plates 7 are provided at both ends in the axial direction of the rotor core 12, and rivet pins 8 are passed through through holes 15 of the stator core and caulked. The rotor 11 has a shaft 9 in a central shaft hole 16.
, The shaft is rotatably held and the rotating magnetic field generated in the stator 1 rotates the rotor 11. According to this configuration, the coil end is reduced, the entire motor can be reduced in size, and high efficiency can be realized in a low-speed rotation region where copper loss is dominant.

The conductive winding 5 is made of a core wire 21 made of fine copper.
Are bundled, and the outer circumference of the core wire group is thin PET or PE
By covering the insulating pipe 22 of N film,
Insulated. The core wire 21 itself is not provided with an insulating film. PET or PEN is stable with respect to the refrigerating machine oil and the refrigerant, and has good workability since it is soft. When the insulating pipe is made of a fluororesin or polyolefin resin by extrusion, the dielectric constant is as low as 2.0 to 2.1, the leakage current can be reduced, and the heat resistance is good. Extrusion molding enables continuous molding, which improves productivity. Further, since the core wire is excellent in heat resistance, chlorofluorocarbon resistance and oil resistance, and the core wire is completely insulated, the leakage current is reduced.

Further, a silicon resin having excellent heat resistance may be used as the insulating pipe. Alternatively, a tube made of polyester, polyolefin, or fluororesin may be used as the insulating pipe. As a result, an insulating layer having excellent heat resistance, chlorofluorocarbon resistance and oil resistance can be secured, and since flexibility is maintained, winding property is also good. In addition, one tube can cope with various types of core wire systems.

When a tube having heat shrinkability is used as the tube, the thickness of the insulating layer can be reduced, and the space factor can be improved. In addition, a polyester or PPS fiber braid is used in the lower layer as an insulating pipe, a polyester film or PPS film wound spirally in the middle layer, and polyester or P
A braided tube of PS fibers may be used. Thereby, the heat resistance, the chlorofluorocarbon resistance, and the oil resistance are excellent, and the core wire is resistant to damage due to external force, has flexibility, and has excellent winding properties.

The conductive winding is driven at a low voltage of, for example, 42 V and needs to be operated in a wide range of about 2,000 r / min to 20,000 r / min. There is
The number of turns is very small.

The total cross-sectional area of the core wire 21 constituting one conductive winding 5 is not less than 5 mm ^{2 and not} more than 10 mm ² , and is formed between adjacent teeth and a groove portion into which the winding is inserted, that is, When the space factor of the core wire occupying the slot is 60% or more, the same or higher efficiency can be secured as compared with a conventional case where a large number of copper wires having an insulating film are bundled and wound. Usually, it may be about 50% or more.

Normally, when the conductive winding 5 having a complete circular cross section is completely aligned and wound, the maximum space factor is about 80%. The conductive winding 5 in the present embodiment is obtained by bundling the core wires 21, and since the position of each core wire 21 can be shifted in the middle of the winding, the cross-sectional area of the conductive winding 5 (core wire 21 When compared with a single copper wire (thick line) having the same cross-sectional area as the cross-sectional area of the copper wire (the product of the cross-sectional area and the number of pieces), it can be easily deformed. That is, the winding property can be improved, and the winding state can be made closer to the maximum space factor.

In the case where the winding is performed with one copper wire (thick wire), the winding becomes thicker, and it is difficult to completely align the winding.

The diameter of the cross section of the core wire 21 is 1 mm or less, preferably 0.94 mm or less. At this time, when a core wire having a diameter of 0.94 mm is used, the number of core wires 21 is 7 to 1
Although four wires are bundled, since the conductive winding 5 is required to be soft for processing, a core wire having a diameter of about 0.5 mm may be used. At this time, 25 to 51 core wires 21 are bundled. The reason why the diameter should be 0.94 mm or less is to prevent the influence of the skin effect. In particular, in the case of a drive system that is rectified by a switching element such as a transistor and changes the voltage applied to the motor by PWM control, current harmonics due to the carrier frequency are superimposed. Therefore, a design considering the skin effect is required.

Hereinafter, the relationship between the skin effect and the wire diameter will be described with reference to FIGS. The skin effect when a current flows at a high frequency is expressed by (Equation 1).

[0043]

(Equation 1) Here, δ: skin thickness, ω: angular frequency, μ: magnetic permeability,
σ: conductivity

Here, in the case of copper, μ = 1.25663E
Since −6 (H / m) and σ = 5.76E + 7 (S / m), when the carrier frequency of the PWM control is 20 kHz, the skin thickness is 0.47 mm. Therefore, if the radius is 0.47 mm or less, the skin effect is not affected. Note that the carrier frequency is 2.75 kHz, 3 kHz.
z, the skin thickness at each of 5 kHz is 1.26 mm,
1.21 mm and 0.94 mm, and the radius of the core wire may be equal to or less than these values. That is, as the carrier frequency increases, current flows only in the portion of the depth δ near the surface of the core wire, so that the effective winding resistance increases. Therefore, the diameter D of the core wire is desirably 2δ or less. However, since the conductive winding needs to have good workability, it is preferable that the conductive winding be soft. Therefore, the thinner the core wire, the better. In particular, in recent years, PWM has been
When the control carrier frequency is taken out of the audible range, a value of especially 20 kHz may be taken,
Is considered to be the upper limit of the normal carrier frequency.

The conductive windings 5u1, 5u2 of each phase,
5v1, 5v2, 5w1, and 5w2, as shown in FIG. 4, a coil is formed in each tooth in one conductive winding, and as shown in FIG. It may be pole-parallel to form and connect them in series, but pole-series reduces the number of connections. Further, in the case of pole-parallel, the number of windings can be increased more than in pole-series, so that the total cross-sectional area of the core wire constituting one conductive winding can be reduced, so that there is an advantage that workability is improved. In any case, the connection at the neutral point is particularly difficult because the ends of the conductive windings for three phases are gathered.

In this embodiment, as shown in FIG.
It is preferable that the neutral point terminals 24u, 24v, 24w of each phase (that is, the ends of the conductive windings) be caulked with a conductive pipe 25 made of copper or the like. The present method can be applied not only to the connection of the neutral point, but also to a necessary portion of another connection. Note that the conductive pipe 25 may be a folded plate, and the outer periphery of the pipe needs to be insulated in some form. As an example, there is a method of covering a conductive pipe and a resin cap 26 covering the core wire portion at the tip from the conductive pipe.

If a ring-shaped or flag-shaped terminal is provided at the end of the conductive pipe, it can be used as it is as a power supply terminal.

As shown in FIG. 7, the input terminal of each phase extends the end of the conductive winding as it is,
u, 29v, and 29w, connecting the inside and outside of the compressor shell 30 with a connection terminal 28 with an external power supply terminal 27
If the connection is made directly to the wire, the number of connection steps is extremely reduced. The lead wire may be directly connected to a power terminal. In addition, since the lead wire portion is soft, it may move due to vibration or the like due to operation of the electric motor or generate friction with the conductive winding, so the axial direction of the conductive winding wound around the tooth may be used. It is good to fix to the end with the binding thread 23. Not only the lead wire but also the conductive winding connected to the neutral terminal, the connecting wires 31u, 31v, 31w, etc. can be similarly fixed by the binding string 23.

When a resin molded product (insulator 45) is used for insulation between the stator core and the conductive winding, as shown in FIG. 8, the neutral terminal 44 of the conductive winding is used.
A terminal box 46 for storing u, 44v and 44w is formed simultaneously with the insulator 45, and the neutral terminal 4
After the 4u, 44v, and 44w are peeled off and deposited in the terminal box 46, it is preferable that the conductive adhesive 48 is poured, fixed, and connected. Thereby, connection and fixation of the neutral terminal can be performed at the same time, and productivity is improved. In addition, if the ends of the external power supply lead wires are simultaneously deposited in the terminal box and connected to the ends of the conductive windings wound on the teeth of the stator, the connection of the terminals of each phase is also possible. Available.

It is preferable to form the key portions 47u, 47v, 47w simultaneously with the insulator in order to specify the path of the neutral terminal to the terminal box and fix the conductive winding. is there. The key portions 47u, 47v, 47w are:
It fixes lead wires, crossover wires, and the like connected to the neutral point terminals 44u, 44v, 44w and the power supply terminal, and guides them to a predetermined position such as a terminal box, and may be a groove or a wall. .

The insulating pipe need only be peeled off from the conductive windings only at the connection portions and the connection portions with the connection terminals. That is, peeling of the film of the conductive winding becomes easy.

The insulator covering the outer periphery of the core wire group is made of thin PE
An insulating pipe 22 made of T or PEN film or the like, having a thickness of about 0.1 mm (0.05 mm or more and 0.1 mm or more).
(5 mm or less), it is sufficiently soft and has good insulating properties. In this case, the cross-sectional area of the insulator is about 10% of the core wire group. If the insulation of the conductive winding 5 is good, slot insulation is not necessary, but slot insulation may be provided depending on the current flowing through the winding. In this embodiment, slot insulation is provided. Also,
When the insulator covering the outer periphery of the core wire group is a braid of insulating fibers, the conductive winding is further softened.

The material of the core wire is preferably inexpensive electrolytic copper which has low specific resistance and good workability and is inexpensive. However, in order to further improve the workability and reduce the weight, electric aluminum is preferable, and the specific resistance is further reduced. If you want to, silver is better. With a 0.2% proof stress, copper is 12 kg / mm ² , whereas aluminum is 3 kg / mm ² , and has a small Young's modulus and is soft.

The motor is operated at a low voltage, particularly at a voltage of 50 V or less, and is used at a winding current of 50 A or more. The maximum output is about 2500 W. This is suitable for driving an electric motor using a moving battery which is usually low voltage as a power source. That is, it is suitable for an electric compressor or the like for performing air conditioning in a vehicle. With such an output, air conditioning in a large vehicle can be performed.

In this configuration, since the motor can be downsized, a large space inside the vehicle is not required for mounting, and the space inside the vehicle can be widened. In addition, the operation time per charge is long due to high efficiency. . Therefore, even when the engine is stopped when the vehicle is stopped, it is possible to operate air conditioning for a long time using the battery.

[0056]

As is apparent from the above description, according to the first aspect of the present invention, since each core wire is not insulated at the time of connection, the man-hour for peeling off the insulating film can be reduced. Provide a motor with good productivity.

According to the second aspect of the present invention, an electric motor with high efficiency is provided.

According to the third aspect of the present invention, the number of times of connection can be omitted, and the productivity is improved.

According to the invention described in claim 4 of the present application, connection can be made easily and reliability is improved.

According to the fifth aspect of the present invention, since conduction between the core wires can be ensured, the contact resistance can be reduced.

According to the sixth aspect of the present invention, the number of connection times can be omitted.

According to the present invention, the lead wire is fixed, and the reliability of the lead wire is improved.

According to the present invention, the lead wire is fixed with a small number of steps, and the reliability of the lead wire is improved.

According to the ninth aspect of the present invention, there is no effective increase in the winding resistance due to the skin effect, especially when the carrier frequency is increased to 20 kHz.

According to the tenth aspect of the present invention, the specific resistance is low and the efficiency is improved.

According to the eleventh aspect of the present invention, since the processing is easy and the winding thickness is small, the space factor can be increased.

According to the twelfth aspect of the present invention, the insulation is highly reliable, and does not adversely affect the refrigerating machine oil or the refrigerant.

According to the thirteenth aspect of the present invention, the winding is soft and easy, and the space factor can be increased.

According to the invention described in claim 14 of the present application, workability is good.

According to the invention of claim 15 of the present application, the productivity and the space factor are improved.

According to the invention of claim 16 of the present application, productivity and space factor are improved.

According to the seventeenth aspect of the present invention, the motor efficiency is improved.

According to the eighteenth aspect of the present invention, the overall length of the motor can be reduced, and the efficiency of the motor is high.

According to the nineteenth aspect of the present invention, it is possible to suppress an increase in effective winding resistance due to a skin effect.

According to the invention described in claim 20, the maximum output is around 2500 W, and air conditioning in a large vehicle can be performed.

According to the twenty-first aspect of the present invention, a low-voltage motor can be easily manufactured and the efficiency can be improved.

According to the invention described in claim 22 of the present application, it is possible to provide a small-sized compressor with low power consumption.

[Brief description of the drawings]

FIG. 1 is a perspective view of a stator of an electric motor according to an embodiment of the present invention.

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

FIG. 3 is a cross-sectional view of an electric compressor for a vehicle equipped with an electric motor according to an embodiment of the present invention.

FIG. 4 is a connection diagram of conductive windings of an electric motor according to an embodiment of the present invention.

FIG. 5 is a connection diagram of another conductive winding of the electric motor according to the embodiment of the present invention.

FIG. 6 is a diagram showing a method for connecting a neutral terminal of the electric motor in one embodiment of the present invention.

FIG. 7 is an enlarged view of the vicinity of an external power supply terminal of the electric motor according to one embodiment of the present invention.

FIG. 8 is a diagram showing a method of connecting a neutral point terminal of another electric motor according to an embodiment of the present invention.

FIG. 9 is a view for explaining a skin effect of a core wire;

FIG. 10 is a diagram showing a relationship between a carrier frequency and a skin thickness.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 stator 2 teeth 3 stator core 4 insulating film 5 conductive winding 21 core wire 22 insulating pipe 23 binding thread 24 u, 24 v, 24 w neutral point terminal 25 conductive pipe 26 cap 27 external power supply terminal 28 connection terminal 29 u , 29v, 29w Lead wire 30 Shell 44u, 44v, 44w Neutral terminal 45 Insulator 46 Terminal box 47u, 47v, 47w Key part 48 Conductive adhesive

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) H02K 3/50 H02K 3/50 Z 5H621 3/52 3/52 E 7/14 7/14 B 21/16 21/16 M (72) Inventor Hisaka Kataoka 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Toshiyuki 1006 Kazuma Kadoma, Kadoma City, Osaka Pref.Matsushita Electric Industrial Co., Ltd. Address Matsushita Electric Industrial Co., Ltd. (72) Inventor Hirofumi Mizukami 1006 Oji Kadoma, Kadoma City, Osaka Pref. Matsushita Electric Industrial Co., Ltd. F-term (reference) CA05 CB02 CB03 CB04 CB12 CB23 CC05 CC11 CC17 CD21 CE03 CE13 CE14 EE04 EE 08 EE09 FA01 FA02 FA16 FA26 5H604 AA08 BB01 BB10 BB14 CC01 CC05 CC15 DA16 DB01 DB11 DB26 PB02 PC04 QB03 5H607 BB01 BB07 BB14 CC01 CC05 DD01 DD02 DD03 DD08 DD10 DD16 DD17 FF07 5H621 BB10 GB14 HH01 JK04

Claims (22)

[Claims] 1. A rotor comprising: a rotor; a stator having a plurality of teeth; and a conductive winding having a coil formed by applying concentrated winding to the teeth. An electric motor characterized by using a core wire group in which core wires are bundled and whose outer periphery is insulated. 2. The conductive wire according to claim 2, wherein the total cross-sectional area of the core wire is 5 mm ² or more and 10 mm ² or less, and the space factor of the core wire of the conductive wire occupying a slot formed between adjacent teeth portions. The electric motor according to claim 1, wherein the value is 60% or more. 3. A three-phase synchronous motor in which a U-phase conductive winding, a V-phase conductive winding, and a W-phase conductive winding are wound around teeth, wherein one conductive winding of the same kind is one. 2. The electric motor according to claim 1, wherein a coil portion is formed on the tooth portion by the conductive winding of the first and second portions, one end of each end is connected to each other as a neutral point, and the other end is connected to an input terminal of each phase. 4. A caulking method using a conductive pipe or a folded plate is used as a means for connecting the end of the conductive winding to the input terminal of each phase or for connecting the ends of the conductive windings of different phases. The electric motor according to claim 3, wherein: 5. A conductive adhesive is used as a means for connecting an end of a conductive winding to an input terminal of each phase or a means for connecting ends of conductive windings of different phases. The electric motor according to claim 3, wherein 6. The power supply according to claim 1, wherein the conductive winding is directly connected to an external power supply terminal or a connection terminal of the external power supply terminal.
An electric motor as described. 7. A part (hereinafter, referred to as a “lead wire”) from a winding end of a conductive winding to an external power supply terminal or a connection terminal to the external power supply terminal (hereinafter referred to as “lead wire”). 7. The electric motor according to claim 6, wherein the winding is fixed to an end in the axial direction with a binding thread. 8. A resin provided between the winding end of the conductive winding and an external power supply terminal or a connection terminal to the external power supply terminal for insulating the stator core from the conductive winding. The electric motor according to claim 6, wherein the electric motor is guided by a groove or a key provided in a molded product (hereinafter, referred to as an "insulator"). 9. The diameter of a cross section of one core wire is 0.94 mm.
The electric motor according to claim 1, wherein: 10. The electric motor according to claim 1, wherein the material of the core wire is electrolytic copper. 11. The electric motor according to claim 1, wherein the material of the core wire is electric aluminum. 12. The core wire group is made of PET film or PE.
The electric motor according to claim 1, wherein the electric motor is covered with an N film. 13. The core wire group is made of polyester or PPS.
The electric motor according to claim 1, wherein the electric motor is covered with a fiber braid. 14. The core wire group is insulated by a braid of polyester or PPS fiber in the lower layer, a polyester film or PPS film wound spirally in the middle layer, and a braid of polyester or PPS fiber in the upper layer. Item 1. The electric motor according to Item 1. 15. The electric motor according to claim 1, wherein the core wire group is covered with a fluororesin or a polyolefin resin by extrusion molding. 16. The electric motor according to claim 1, wherein the core wire group is insulated by a tube made of polyester, polyolefin, or fluororesin. 17. The electric motor according to claim 16, wherein the tube is provided with heat shrinkability. 18. The electric motor according to claim 1, wherein the stator has 3N teeth, and the rotor is made of 2N pole permanent magnets. 19. The electric motor according to claim 1, wherein a current flowing through the conductive winding is a current rectified by a switching element and subjected to PWM control. 20. The electric motor according to claim 1, wherein a voltage applied to a winding of the electric motor is 50 V or less, and a current flowing through the winding is 50 A or more. 21. The electric motor according to claim 1, wherein the electric motor is driven by a power supply that moves together with the electric motor. 22. An electric compressor for a vehicle, comprising the electric motor according to any one of claims 1 to 21.