DE112014006576B4 - engine - Google Patents

Abstract

A motor comprising: a core (2) having a plurality of teeth (6); a feed section coil (71) formed by electrically connecting unit coils (3), each of said unit coils (3) being composed of a plurality of electric wire members (10a, 10b ) is formed in plural layers by winding the plural electric wire elements (10a, 10b) around the plural teeth (6) respectively along a radial direction thereof; and an insulating body (4) formed between the core (2) and each of the unit coils (3), wherein the plurality of electric wire elements (10a, 10b) in each of the unit coils (3) are wound so as to be in a circumferential direction of each of the plurality of teeth (6) are stacked, at least two electric wire members (10a, 10b) of the plurality of electric wire members (10a, 10b) of each of the unit coils (3) being wound in the same direction or opposite directions to the circumferential direction of the plurality of teeth (6). ,wherein two end portions of the plurality of electric wire members (10a, 10b) of each of the unit coils (3) have a coil input end portion (24, 34, 63) and a coil output end portion (25, 35, 65), respectively, and wherein in a case of connection of end portions of the electric wire members (10a, 10b) wound in the same direction from end portions of the plurality of electric wire members (10a, 10b) except the two end portions n, a circumferentially innermost end portion and a circumferentially outermost end portion are short-circuited, and in a case of connecting end portions of the electric wire members (10a, 10b) wound in the opposite directions from the end portions of the plurality of electric wire members (10a, 10b ), except for the two end portions, circumferentially innermost end portions or circumferentially outermost end portions are short-circuited, and the coil input end portion and the coil output end portion are electrically connected via a path.

Description

technical field

The present invention relates to an inverter-driven motor driven by an inverter, for example.

State of the art

In a winding structure of a medium to low voltage inverter-driven motor, as compared with a case of high-voltage equipment such as a high-voltage transformer, a voltage distribution for a steep surge voltage has not been extensively studied (see, for example, JP 2008 - 043 108 A (Lines 24 - 49 of page 3 and 3 )).

As a method for solving a problem related to voltage distribution for a steep surge voltage, a common voltage dropping structure in which a capacitor for adjusting a distribution capacitance between windings is connected has been proposed. However, no winding structure has been known in which the common voltage is lowered by a method in which a winding is only around a single core (see, for example JP 2005 - 065 363 A , lines 9 - 19 of page 3 and 3 ).

From the JP H05 - 90 056 A there is known a single coil suitable for constituting a feed section coil in a motor by electrically connecting single coils. The single coil is formed of multiple electric wire members in multiple layers by winding the multiple electric wire members. Further, the single coil includes end portions of the plurality of electric wire elements, wherein one of the end portions has a coil input end portion and one of the end portions has a coil output end portion, and two end portions other than the coil input end portion and the coil output end portion are short-circuited.

From the US 2013 / 0 062 986 A1 there is known a motor having a core and a feed section coil formed by electrically connecting individual coils.

From the WO 92/02982 A1 there is known a motor having a core including a plurality of teeth and a feed section coil formed by electrically connecting differently shaped individual coils.

Also from the DE 696 02 877 T2 there is known a motor having a core including a plurality of teeth and a feed section coil configured by electrically connecting differently configured individual coils. The single coil is a multi-layer coil wound radially around a tooth. The winding of the individual coil is designed in such a way that the winding capacitance is reduced and therefore there is no need to reinforce the conductor insulation.

Summary of the Invention

Technical problem

In recent years, as energy saving is required more, a high-efficiency inverter-driven motor has been more widely used.

In the case of this inverter-driven motor, when a rise time of an inverter output voltage pulse is equal to or shorter than a pulse propagation time at each alternating revolution in a cable connecting the inverter and the motor, a surge voltage twice as high as the voltage pulse of the inverter output is generated in the motor.

In addition, when the frequency of the pulse voltage of the inverter output exceeds a resonance frequency of a feed section coil of the motor, a phenomenon is caused in which a high voltage is applied to the feed section coil. Exceeding the resonant frequency reveals a capacitance component in the motor and thus the voltage concentrates on the feed section coil.

Therefore, there is a problem that even if there is no insulation defect in the motor, when a voltage between electric wires exceeds a partial discharge starting voltage, partial discharge takes place and causes insulation deterioration, resulting in dielectric breakdown in a short period of time.

To solve this problem, insulation can be strengthened, for example, by increasing a thickness of a coating film of an electric wire of the feeder section coil on the feeder section side, which, however, causes a problem in that a space factor of the motor winding is reduced.

In addition, in the in JP 2005 - 065 363 A disclosed winding structure, wires are wound around a plurality of cores, and thus, when an electric wire of a feeding section coil and an electric wire of a coil remote from the feeding section are brought into contact with each other, a similar problem is caused.

The present invention has been made to solve the above problem, and an object of the present invention is to obtain a motor which can prevent dielectric breakdown by lowering a voltage excessively distributed to a feed section coil on a feed section side .

solution to the problem

The problem is solved by a motor according to patent claim 1 . Advantageous developments are specified in the dependent claims.

Advantageous Effects of the Invention

The motor according to the present invention can lower a voltage that is excessively distributed to the feed section coil on a feed section side to prevent dielectric breakdown by arranging the electric wire element of the single coil on the input end side and the electric wire element on the output end side close to each other will.

character list

• 1 14 is a structural view to show an inverter-driven motor according to Embodiment 1 of the present invention.
• 2 FIG. 14 is an enlarged sectional view taken around a portion A of FIG 1 to represent.
• 3 is an equivalent circuit diagram for a stator portion of 2 to represent.
• 4 13 is a front sectional view to show a main part of an inverter-driven motor as a comparative example of embodiment 1. FIG.
• 5 is an equivalent circuit diagram for a stator portion of 4 to represent.
• 6 is an equivalent circuit to represent the inverter driven motor.
• 7 13 is an equivalent circuit diagram to show a case where capacitances of a feeding section coil except for the feeding section in the equivalent circuit of FIG 6 are connected.
• 8th Fig. 12 is an illustration of a method of connecting enameled wire elements.
• 9 13 is a front sectional view to show a main part of an inverter-driven motor according to Embodiment 2 of the present invention.
• 10 14 is a partial perspective view in which a paired enameled wire member is coated with an insulator in an inverter-driven motor according to Embodiment 3 of the present invention.
• 11 FIG. 12 is a front sectional view to show a main part of the inverter-driven motor by the paired magnet wire member of FIG 10 to represent.

Description of the embodiments

An inverter-driven motor according to each embodiment of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same or corresponding elements and parts are denoted by the same reference numerals.

Embodiment 1

1 12 is a structural view to show an inverter-driven motor 100 according to Embodiment 1 of the present invention, and 2 FIG. 14 is an enlarged sectional view taken around a portion A of FIG 1 to represent.

The inverter-operated motor 100 comprises a rotatable rotor 70 and a stator 1 surrounding the rotor 70.

The stator 1 includes a core 2 and a feed section coil 71 wound around the core 2 via an insulator 4 .

The core 2 is made of laminated magnetic steel sheets, and includes a ring-like yoke 7 and a plurality of teeth 6 formed at regular intervals along a circumferential direction and having tip portions extending radially inward from the yoke 7 .

The core 2 according to this embodiment is formed by joining cut surfaces of divided cores, which are portions of the core divided into two along a line passing through a central axis thereof, to each other by welding.

The feed section coil 71 comprises a plurality of individual coils 3 electrically connected to one another.

Each of the individual coils 3 is formed by winding enamel wires 10 around each of the teeth 6 in four layers. The enameled wires 10 are electrical wires that are circular in section.

The enameled wire 10 comprises a first enameled wire element 10a as the first electrical wire element and a second enameled wire element 10b as the second electrical wire element.

The first member enameled wire 10a and the second member enameled wire 10b form a group of electric wire members which are circumferentially stacked and bundled together. The element electric wire group is wound and reciprocated along a radial direction.

numbers in 2 denote the order of winding (the number of turns). The element electric wire group is first wound radially inward by ten turns from a radially outermost side of a tooth 6, and is then wound by ten turns from a radially innermost side to the radially outermost side.

A winding end portion of the first enameled wire element 10a (number 20 in 2 ) and a winding start part of the second enameled wire element 10b (number 1 in 2 ) are shorted together using a connecting line 29. A winding start part of the first enameled wire element 10a (number 1 in 2 ) is a coil input end portion 24 of the enameled wire 10, and a winding end portion of the second enameled wire member 10b (number 20 in 2 ) is a coil output end section 25 of the enameled wire 10.

The short circuit between the first enameled wire member 10a and the second enameled wire member 10b can be canceled with an insulating coating film at a portion where the members are in contact with each other.

Specifically, in the single coil 3, the circumferentially outermost end portion of the winding of the first enameled wire member 10a in odd-numbered layers and the circumferentially innermost end portion of the winding of the second enameled wire member 10b in even-numbered layers are short-circuited with each other, the circumferentially innermost end portion of the winding of the first enameled wire member 10a in the odd-numbered layers is the coil input end portion 24, and the circumferentially outermost end portion of the winding of the second enameled wire element 10b in the even-numbered layers is the coil output end portion 25.

3 12 is an equivalent circuit diagram of a stator section with the single coil 3 and the tooth 6 of FIG 2 .

The single coil 3 includes a coil portion 20 in a first layer corresponding to portions of the first enameled wire element 10a numbered 1 to 10 in 2 are a coil portion 21 in a second layer corresponding to portions of the second enameled wire element 10b numbered 1 to 10 in 2 are a coil portion 22 in a third layer corresponding to portions of the first enameled wire member 10a numbered 11 to 20 in 2 and a coil portion 23 in a fourth layer corresponding to portions of the second enameled wire member 10b denoted by the numerals 11 to 20 in 2 are designated.

An end portion of the single coil 3 is the coil input end portion 24 (number 1 of the first enameled wire element 10a in 2 ), and another end portion of which is the coil output end portion 25 (number 20 of the second enameled wire member 10b in 2 ).

Numeral 26 denotes an interlayer capacitor having a capacitor interlayer distribution capacitance between the coil portions 20 and 21, 21 and 22, or 22 and 23 in each of the layers. Numeral 27 denotes a ground capacitor which has a ground capacitance of the coil portion 20, 21, 22 or 23 in each of the layers. Numeral 28 denotes a choke coil having an inductance of the coil portion 20, 21, 22 or 23 in each of the layers.

4 Fig. 12 is a sectional view to show a main part of a related art inverter-driven motor.

This example is a comparative example of the inverter-driven motor 100 of FIG 2 , and it forms a single coil 3A in which an enameled wire 11 serving as an electric wire is stacked in four layers in total around the tooth 6 in order corresponding to the numbers in 3 is wound up. A coil input end portion of the single coil 3A is a part of the enameled wire 11 inserted in 3 is denoted by numeral 1, and a coil output end portion of the single coil 3A is a part of the enameled wire 11 shown in 3 marked with number 40.

5 12 is an equivalent circuit diagram of a stator section with a single coil 3A and tooth 6 of FIG 4 , which corresponds to a part of the stator 1.

The single coil 3A includes a coil portion 30 in a first layer that corresponds to portions of the enameled wire 11 that are in 4 denoted by the numerals 1 to 10, a coil portion 31 in a second layer corresponding to portions of the enameled wire 11 shown in 4 denoted by the numerals 11 to 20, a coil portion 32 in a third layer corresponding to portions of the enameled wire 11 shown in 4 denoted by numerals 21 to 30, and a coil portion 33 in a fourth layer corresponding to portions of the enameled wire 11 shown in 4 are denoted by the numbers 31 to 40. An end portion of the single coil 3A is a coil input end portion 34 (number 1 of the enameled wire 11 in 4 ), and another end portion of which is a coil output end portion 35 (number 40 of the enameled wire 11 in 4 ).

Numeral 36 denotes an interlayer capacitor having an interlayer distribution capacitance between the coil portions 30 and 31, 31 and 32, or 32 and 33 in each of the layers. Numeral 37 denotes a ground capacitor which has a ground capacitance of the coil portion 30, 31, 32 or 33 in each of the layers. Numeral 38 denotes a choke coil having an inductance of the coil portion 30, 31, 32 or 33 in each of the layers.

How out 5 As can be seen, in the related art single coil 3A, the interlayer capacitors 36 are connected in series.

On the other hand, in the single coil 3 according to the embodiment of the present invention, the coil portion 20 is provided in the first layer and the coil portion 22 is provided in the third layer on the coil input end portion 24 side, and the coil portion 21 is provided in the second layer and the coil portion 23 is provided in the fourth layers are provided on the coil output end portion 25 side. Interlayer distribution capacitances between adjacent coil sections, ie between the coils n portions 20 and 21, 21 and 22, and 22 and 23 arise between the coil portions 20 and 22 on the coil input end portion 24 side and the coil portions 21 and 23 on the coil output end portion 25 side. Thus, there is a capacitance between the coil input end portion 24 side and the coil output end portion 25 side in a state where the respective interlayer distribution capacitances 26 are close to a parallel state.

Therefore, the single coil 3 according to this embodiment can have a larger capacity compared to the related art single coil 3A.

6 12 is an equivalent circuit diagram to show the inverter-driven motor 100, and 7 FIG. 14 is an equivalent circuit diagram to show an equivalent circuit in which capacitances of coils except for the feeding section coil 71 where the plurality of unit coils 3 are electrically connected are converted into an equivalent circuit diagram of FIG 6 are coupled.

The equivalent circuit of the inverter-driven motor 100 includes coil element capacitors 40 having capacitances of the respective unit coils 3, a feed section coil equivalent circuit 41 having ground capacitors 44 having ground capacitances of a motor feed section, and an equivalent circuit 42 for the coils except for the feed section coil.

In 6 reference numeral 43 designates a motor feeding section terminal.

In addition, includes in 7 a feed section coil equivalent circuit 45, a feed section coil inner capacitor 46 having a feed section coil inner distribution capacitance, and a ground capacitor 47 having a ground capacitance of the motor feed section.

In 7 Reference numeral 47 designates a coupling capacitance of the entire inverter-driven motor 100 except for the feed section coil.

A voltage applied to the entire inverter-driven motor 100 is represented by E. FIG. A voltage applied to the feed section coil is shown as V ₁ . An internal distribution capacitance of the feed section coil internal capacitor 46 is represented by C ₁ , a coupling capacitance of the ground capacitor 47 of the entire inverter-driven motor 100 except for the feed section coil is represented by C _a , and a ground capacitance of the ground capacitor 44 is represented by C ₂ .

In a high frequency range at a steep surge voltage generated by the inverter operation, the voltage V ₁ is expressed by the internal distribution capacitance C ₁ , the coupling capacitance C _a and the ground capacitance C ₂ as in the following expression. $$\begin{array}{l}({\text{<figure-callout id="1" label="Voltage V" filenames="DE112014006576B4\_0002.png,DE112014006576B4\_0003.png" state="{{state}}">Voltage V</figure-callout>}}_1,\text{applied to the feed section coil}\text{becomes})=\{\left({\text{C}}_{\text{a}}+{\text{C}}_2\right)/({\text{<figure-callout id="1" label="C" filenames="DE112014006576B4\_0002.png,DE112014006576B4\_0003.png" state="{{state}}">C</figure-callout>}}_1+{\text{C}}_{\text{a}}+\\ {\text{C}}_2)\}\cdot \text{E}\end{array}$$

Therefore, by adopting a coil having a large internal distribution capacitance C ₁ and a small ground capacitance C ₂ as the feed section coil, the feed section voltage at the highest voltage can be lowered.

Therefore, according to the inverter-driven motor 100 of this embodiment, the excessive voltage applied to the feeding section can be suppressed to the partial discharge start voltage or below to prevent partial discharge, and thus the reliable inverter-driven motor 100 can be obtained without reducing a space factor due to insulation reinforcement.

Moreover, the coil input end portion 24 and the coil output end portion 25, which have the largest potential difference in the unit coil 3, are located on the circumferentially innermost side and the circumferentially outermost side of the unit coil 3, respectively. Thus, parts of the enameled wire 10 that have a potential difference that exceeds the partial discharge starting voltage are not adjacent to one another.

This enables an effect that partial discharge in the single coil 3 is suppressed to be realized.

Embodiment 2

In Embodiment 1, the single coil 3 has a structure including the four layers of the enameled wire 10 using the two enameled wire members of the first enameled wire member 10a and the second enameled wire member 10b, but the number of the electric wire members and the number of layers are not limited thereto.

8th 14 is an explanatory view to show connection states of n enameled wire members 50, 51, 52, and 53 wound around the teeth 6, respectively, in the inverter-driven motor 100 according to Embodiment 2 of the present invention.

When the direction of winding is the same for all the enameled wire members 50, 51, 52 and 53 serving as electric wire members, by connecting a winding start part 54 of one of the enameled wire members 50, 51, 52 and 53 to a winding end part 55 of another of the enameled wire members 50, 51, 52 and 53, the direction of magnetic fluxes generated in the respective enameled wire elements 50, 51, 52 and 53 can be made the same.

Furthermore, when one group of the enameled wire members 50, 51, 52 and 53 is wound clockwise and another group of them is wound counterclockwise so that the enameled wire members 50, 51, 52 and 53 are wound in opposite directions by winding start portions 54 of these are connected, the direction of resulting in the respective magnet wire elements 50, 51, 52 and 53 magnetic fluxes are designed to be the same.

This allows any change in the arrangement of the respective layers regardless of the number of the enameled wire elements 50, 51, 52 and 53 and the number of turns thereof.

In other words, the inverter-driven motor 100 according to Embodiment 2 includes the core 2 having the plurality of teeth 6, the feeder section coil 71 formed by electrically connecting the unit coils 3 in each of which a plurality of electric wire members are wound around each of the teeth 6 along the radial direction to form the electric wire members in multiple layers, and the insulating body 4 formed between the core 2 and the single coil 3.

The plural electric wire elements are wound in the single coil 3 in a stacked manner in a circumferential direction of the tooth 6 . At least one element electric wire of the plurality of element electric wires of the single coil 3 is wound in a direction opposite to a direction of winding another element electric wire. Two end portions of the electric wire members of the single coil 3 are an input end portion and an output end portion, respectively.

In the case of connecting end portions of the electric wire members wound in the same direction, of end portions of the electric wire members other than the two end portions, a circumferentially innermost end portion as a winding start part and a circumferentially outermost end portion as a winding end part are short-circuited. In the case of connecting end portions of the electric wire members wound in opposite directions, of the end portions of the electric wire members except the two end portions, circumferentially innermost end portions as winding start parts or circumferentially outermost end portions as winding end parts are short-circuited, and the input end portion and the output end portion are electrically connected via a path.

9 14 is a sectional view to show a main part of the inverter-driven motor 100 when the direction of winding differs between adjacent electric wire members.

In this example, a first magnet wire element 12a and a third magnet wire element 12c are wrapped around tooth 6 in a clockwise direction, and a second magnet wire element 12b and a fourth magnet wire element 12d are wrapped around tooth 6 in a counterclockwise direction.

In the enameled wire members 12a, 12b, 12c and 12d each of which is wound in one layer along the radial direction of the tooth 6 from a radially outer side to a radially inner side, a winding start part of the first enameled wire member 12a (number 1 in 9 ) and a winding end part of the second enameled wire element 12b (number 1 in 9 ) shorted together using a connecting line 62.

In addition, a winding end part of the second enameled wire member 12b (number 10 in 9 ) and a winding end part of the third enameled wire member 12c (number 10 in 9 ) are shorted together using the connecting line 62, and a winding end part of the fourth enameled wire element 12d (number 10 in 9 ) and a winding end part of the first enameled wire element 12a (number 10 in 9 ) are shorted together using the connecting line 62.

A winding start part of the third enameled wire member 12c (number 1 in 9 ) is a coil input end portion 63, and a winding start portion of the fourth enameled wire element 12d (number 1 in 9 ) is a coil output end section 64.

Except for the above, the structure is the same as that of the inverter-driven motor 100 according to Embodiment 1.

By electrically connecting the enameled wire members 12a, 12b, 12c and 12d in this way, the direction of magnetic fluxes generated in the respective enameled wire members 12a, 12b, 12c and 12d can be made equal, and the single coil 3 has a structure in which enameled wires 12 are wound up in a state where the input side and the output side are always stacked adjacent to each other and in parallel.

Therefore, the distribution capacity is highest in the single coil 3, and the concentrated applied voltage to the feeding section coil can be decreased to the maximum.

Therefore, the excessive voltage applied to the feeding section can be suppressed to the partial discharge start voltage or below to prevent the partial discharge, and thus the reliable inverter-driven motor 100 can be obtained without reducing a space factor due to insulation reinforcement.

According to this embodiment, the coil input end portion 63 is the winding start part of the third element enamel wire 12c, and the coil output end portion 64 is the winding start part of the fourth element enamel wire 12d. The coil input end portion 63 and the coil output end portion 64 having the largest potential difference are adjacent to each other, which can be absorbed by increasing the thickness of an insulating coating film formed between the coil input end portion 63 and the coil output end portion 64.

In addition, Embodiment 2 has a problem in that the number of connection points is large, which complicates the structure. However, by winding each of the enameled wire members the same number of times when the enameled wire members are to be reciprocally wound, an end portion at the start of winding and an end portion at the end of wiring are on the same side of the tooth, making the connection work easier.

In addition, by collectively connecting at a connection point using a connection plate or the like, connection can be simplified, thus solving the problem described above.

Moreover, according to this embodiment, each single layer of the enameled wire members 12a, 12b, 12c and 12d is laminated, but multiple layers of each of the enameled wire members 12a, 12b, 12c and 12d may be laminated.

Embodiment 3

10 14 is a perspective view to show a main part of the inverter-driven motor 100 according to Embodiment 3 of the present invention, and 11 FIG. 14 is a sectional view to show a main part of the inverter-driven motor 100 according to Embodiment 3. FIG.

According to this embodiment, a paired enameled wire member 61 including the first enameled wire member 10a and the second enameled wire member 10b is coated with an insulating portion 60 .

The paired enamel wire member 61 is wound radially inward by four turns from the radially outermost side, and is then wound by four turns from the radially innermost side to the radially outermost side.

A winding end part of the first enameled wire member 10a (number 8 in 11 ) a winding end portion of the paired enameled wire member 61 and a winding start portion of the second enameled wire member 10b (number 1 in 11 ) of a winding start portion of the paired enamel wire member 61 are short-circuited to each other using the lead wire 62 . A winding start part of the first enameled wire element 10a (number 1 in 11 ) is the coil input end portion 63, and a winding end part of the second enameled wire member 10b (number 8 in 11 ) is the coil output end section 64.

Except for the above, the structure is the same as that of the inverter-driven motor 100 according to Embodiment 1.

In such a structure, in addition to the effects of the above-described Embodiments 1 and 2, the capacitance between the first enameled wire member 10a and the second enameled wire member 10b becomes uniform in the paired enameled wire member 61 stacked along the radial direction of the tooth 6 . Thus, manufacturing variations can be suppressed, and an electric field between the first member enameled wire 10a and the second member enameled wire 10b can be reduced, and thus an effect of suppressing partial discharge can be obtained.

Embodiment 4

According to embodiment 4 of the present invention, in the in-feed coil of embodiment 1, 2 or 3, the insulating body 4 formed between the core 2 and the single coil 3 has a thickness larger than that between the core and a coil on another Section formed as the feed section insulator.

Such a structure enables a reduction in the ground capacitance generated between the core 2 and the single coil 3 . The ground capacitance C ₂ is smaller than the distribution capacitance C ₁ of the winding using the structure of the present invention, and thus the effect of lowering the voltage V ₁ applied to the feeding section coil becomes larger.

It should be noted that in the above-described embodiments, cases where an enameled wire is used as the electric wire are described. Of course, the present invention is not limited to this and other conductors can also be used.

In addition, the present invention is not limited to the inverter-driven motor 100 and is also applicable to a general-purpose motor.

Reference List

1

stator

2

core

3, 3A

single coil

4

insulator

6

Tooth

7

yoke

10, 11

enameled wire (electrical wire)

10a

first enameled wire element (first electric wire element)

10b

second enameled wire element (second electric wire element)

12a

first enameled wire element (first electric wire element)

12b

second enameled wire element (second electric wire element)

12c

third enameled wire element (third electric wire element)

12d

fourth enameled wire element (fourth electric wire element)

20, 21, 22, 23, 30, 31, 32, 33

coil section

24, 34, 63

coil input end section

25, 35, 64

coil output end section

26, 36

interlayer capacitor

27, 37, 44, 47

mass capacitance

28, 38

choke coil

40

coil element capacitor

41, 45

coil replacement circuit

42

replacement circuit

43

motor feed section connection

46

coil internal capacitor

50a

first enameled wire element (first electric wire element)

50b

second enameled wire element (second electric wire element)

50c

third enameled wire element (third electric wire element)

50d

fourth enameled wire element (fourth electric wire element)

54

winding beginning part

55

winding end part

60

insulating section

61

to form a pair of enamelled wire elements

29, 62

connection line

63

coil input end section

64

coil output end section

71

feed section coil

100

inverter driven motor

Claims (4)

A motor comprising: a core (2) having a plurality of teeth (6); a feeding section coil (71) formed by electrically connecting unit coils (3), each of said unit coils (3) being composed of a plurality of electric wire members (10a, 10b) in a plurality of layers by winding said plurality of electric wire members (10a, 10b) around respectively the plurality of teeth (6) is formed along a radial direction thereof; and an insulating body (4) formed between the core (2) and each of the unit coils (3), wherein the plurality of electric wire members (10a, 10b) in each of the unit coils (3) are wound so as to extend in a circumferential direction each of the plurality of teeth (6) are stacked, wherein at least two electric wire members (10a, 10b) of the plurality of electric wire members (10a, 10b) of each of the unit coils (3) are wound in the same direction or opposite directions to the circumferential direction of the plurality of teeth (6). are, wherein two end portions of the plurality of electric wire members (10a, 10b) of each of the unit coils (3) having a coil input end portion (24, 34, 63) and a coil output end portion (25, 35, 65), respectively, and in a case of connecting end portions of said electric wire members (10a, 10b) wound in the same direction, end portions of the a plurality of electric wire elements (10a, 10b) other than the two end portions, a circumferentially innermost end portion and a circumferentially outermost end portion are short-circuited, and in a case of connecting end portions of the electric wire elements (10a, 10b) wound in the opposite directions , of the end portions of the plurality of electric wire members (10a, 10b) other than the two end portions, circumferentially innermost end portions or circumferentially outermost end portions are short-circuited, and the coil input end portion and the coil output end portion are electrically connected via a path. engine after claim 1 wherein two electric wire members (10a, 10b) wound in the same direction or in the opposite directions have an electric wire member group formed by circumferentially stacking and bundling the plurality of electric wire members (10a, 10b), and wherein the electric Wire element group is coated with an insulating portion (60). engine after claim 1 or 2 wherein the insulating body (4) formed between the core (2) and the single coil (3) arranged on a side of a motor feeding section terminal (43) has a thickness larger than that of the insulating body (4) , which is formed between the core (3) and a single coil (3) other than the single coil (3) arranged on the side of the motor feeding section terminal (43). engine after one of Claims 1 until 3 wherein the motor comprises an inverter driven motor (100).

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