JP2016025796A - Rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that is able to prevent bending of a cylindrical insulating member covering the leading-end portion of the end part of a stator coil.SOLUTION: A stator 200 for an electric machine 100 has a stator core 210 and stator coils in three phases. The end parts 251a to 253a of the stator coils in the corresponding phases are arranged in a circumferential direction while projecting from the axial end face 210a of the stator core 210, and their leading-end portions are covered by insulating members 400. The insulating members 400 are banded to the respective end parts 251a to 253a of the stator coils in the corresponding phases by cords 280 arranged separately along the circumferential direction. Each insulating member 400 is formed by winding insulating film around itself into a cylindrical form, and has a joint area 410 at one end part along the longitudinal direction thereof. The lengths L of the joint areas 410 in the longitudinal direction are set such that the joint areas 410 are banded to the respective end parts 251a to 253a of the stator coils in the corresponding phases by two cords 280 adjacent in the circumferential direction.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotating machine that binds an insulating member that covers a tip portion of an end portion of a stator winding to an end portion of a stator winding using a string.

As a rotating machine, for example, an electric motor 800 shown in FIG. 13 is known.
The electric motor 800 includes a rotor (not shown) and a stator 810.
The stator 810 has a stator core 820 and a stator winding. Stator core 820 is formed by a yoke extending along the circumferential direction, a plurality of teeth extending along the radial direction from the yoke, and teeth adjacent along the circumferential direction when viewed in a cross section perpendicular to the axial direction. It has a plurality of slots. The stator winding is wound around the teeth.
In the electric motor 800 shown in FIG. 13, three-phase (U-phase, V-phase, W-phase) stator windings 831, 832, 833 (not shown) are wound around the teeth, and the stator windings 831, 832 of each phase are wound. , One end 831a, 832a, 833a and the other end (not shown) of 833 are arranged along the circumferential direction in a state of protruding from the axial end surface 820a of the stator core 820. ing. And the front-end | tip part of one edge part 831a, 832a, 833a of the stator windings 831, 832, and 833 of each phase is connected in common, and the connection part for neutral points is formed. The neutral point connecting portion is covered with a cylindrical insulating member 850. The other ends of the stator windings 831, 832, and 833 of each phase are connected to the power supply line directly or via lead wires.
The insulating member 850 is formed by, for example, winding an insulating film in a cylindrical shape and then joining one end. That is, the insulating member 850 is formed as a cylindrical body having a joint region 860 at one end along the longitudinal direction and having the other end opened.
In the state where the tip portions of one end portions 831a, 832a and 833a of the stator windings 831, 832 and 833 of each phase are connected in common and inserted through the opening of the cylindrical insulating member 850, the string ( 840, which is also referred to as a “binding string” or “binding string”, is bound to one end 831 a, 832 a, 833 a and the other end of each phase of the stator windings 831, 832, 833.

Japanese Utility Model Publication No. 7-27260

The length along the longitudinal direction of the joining region 860 of the conventional insulating member 850 is set to be shorter than the distance between the adjacent strings 840 along the circumferential direction from the viewpoint of cost and the like. That is, the maximum number of the strings 840 arranged in the joining region 860 is one.
Here, as shown in FIG. 14 which is a partially enlarged view of FIG. 13, when the string 840 is disposed at the opening side portion of the joining region 860, the tip side portion of the insulating member 850 (with the opening) The portion on the opposite side) may be bent to the side opposite to the axial end surface 820a of the stator core 820 with a place where the string 840 is disposed as a fulcrum.
When the portion on the distal end side of the insulating member 850 is bent to the side opposite to the axial end surface 820a of the stator core 820, the insulating member 850 is connected to the distal end portion (neutral point connection portion on one side) of the stator winding. ). In addition, when the electric motor 800 is used as a driving electric motor for a hermetic compressor, the refrigerant flow is disturbed, and the efficiency of the compressor may be reduced.
The present invention has been devised in view of such a point, and provides a technique capable of preventing the bending of a cylindrical insulating member that covers the tip portion of the end portion of the stator winding. Objective.

The rotating machine of the present invention is preferably configured as an electric motor, but can also be configured as a generator.
The rotating machine of the present invention includes a rotor and a stator that are arranged to be relatively movable, and the stator includes a stator core and a stator winding.
The stator core includes a yoke extending along the circumferential direction, a plurality of teeth extending along the radial direction from the yoke, and teeth adjacent along the circumferential direction as viewed in a cross section orthogonal to the axial direction. It has a plurality of slots to be formed.
The stator winding is wound around the teeth of the stator core. At least one end portion of the stator winding is disposed along the circumferential direction in a state of protruding from the axial end surface of the stator core, and the tip portion is covered with an insulating member. The insulating member is bound to at least one end portion of the stator winding by a string that is spaced apart along the circumferential direction. The other end portion of the stator winding may be arranged along the circumferential direction in a state of protruding from the axial end surface of the stator core together with the one end portion. In this case, the insulating member is bound to at least one of one end and the other end of the stator winding.
Typically, multiphase stator windings are wound around the teeth. Then, at least one end of the stator winding of each phase is arranged along the circumferential direction in a state of protruding from the axial end surface of the stator core, and the tip end portion is commonly connected to the common connection portion. And the common connection portion is covered with an insulating member.
The insulating member is configured by a cylindrical body having a bonding region at one end along the longitudinal direction and having the other end opened. Typically, the insulating member is formed by winding an insulating film in a cylindrical shape and joining one end along the longitudinal direction.

In the first invention, the length L1 along the longitudinal direction of the joining region of the insulating member is such that the joining region is at the end of at least one side of the stator winding by two strings adjacent along the circumferential direction. It is set so that two strings that are adjacent to each other along the circumferential direction are arranged in the joining region so as to be bound.
Typically, one joining region having a length in which two adjacent strings are disposed along the circumferential direction is formed at one end portion along the longitudinal direction of the insulating member.
In the present invention, since the joining region of the insulating member is bound to at least one end of the stator winding by two adjacent strings along the circumferential direction, a portion (opening and opening) of the insulating member is bound. The bending of the opposite part) can be prevented.
In a different form of the first invention, the number of slots is N (pieces), and the diameter of the innermost circumference of at least one end of the stator winding arranged along the circumferential direction is Da (mm). When the outermost diameter is Db (mm), the length L1 (mm) along the longitudinal direction of the joining region is set so as to satisfy the following conditions.
L1min ≦ L1 ≦ L1max
L1min = π × [(Da + Db) / 2] × (θ1min / 360)
θ1min = (360 / N) − [(360 / N) × 0.3 × 2]
L1max = π × [(Da + Db) / 2] × (θ1max / 360)
θ1max = (360 / N) + [(360 / N) × 0.3 × 2]
Note that {π × [(Da + Db) / 2]} represents the length of the circumference at an intermediate position between the innermost circumference and the outermost circumference of at least one end of the stator winding. Further, (360 / N) represents an angle (slot pitch) between the center lines of the teeth bases adjacent to each other along the circumferential direction. [(360 / N) × 0.3] represents the angle between the center line of the tooth base of the tooth and the side wall (one side or the other side wall in the circumferential direction) of the tooth base. Yes.
A string that binds the insulating member to at least one end of the stator winding is disposed on the teeth base of the teeth. For this reason, the length L1 along the longitudinal direction (circumferential direction) of the joining region is the side wall on the side corresponding to the slot formed between the teeth among the side walls of the tooth base portion of the teeth adjacent along the circumferential direction. The length (minimum length: L1min) along the circumferential direction corresponding to the angle between the teeth (minimum angle: θ1min) and the angle between the side wall corresponding to the slot formed between the teeth and the opposite side wall (maximum angle) : Θ1max) is set within a range of a length (maximum length: L1max).

In 2nd invention, it has the 1st joining area | region and 2nd joining area | region which were spaced apart and provided along the longitudinal direction in the edge part of the one side along the longitudinal direction of an insulating member. The length L2 along the longitudinal direction of the first and second joint regions, and the distance L3 along the longitudinal direction between the first joint region and the second joint region are the first joint region and the first joint region. The two joining regions are set so as to be bound to at least one end of the stator winding by two adjacent strings in the circumferential direction, that is, the first and second It is set so that each of the two strings that are adjacent to each other in the circumferential direction is arranged in the joining region.
In the present invention, the first and second joining regions of the joining member are bound to at least one end of the stator winding by two adjacent strings in the circumferential direction. It is possible to prevent the distal end portion (the portion opposite to the opening) from being bent.
In a different form of the second invention, the number of slots is N (pieces), and the diameter of the innermost circumference of at least one end of the stator winding arranged along the circumferential direction is Da (mm). When the outermost diameter is Db (mm), the length L2 (mm) along the longitudinal direction of the first and second joining regions is set to satisfy the following conditions.
L2min <L2 <L2max
L2min = π × [(Da + Db) / 2] × (θ2min / 360)
θ2min = {(360 / N) − [(360 / N) × 0.3 × 2]} / 2
L2max = π × [(Da + Db) / 2] × (θ2max / 360)
θ2max = {(360 / N) + [(360 / N) × 0.3 × 2]} / 2
Note that {π × [(Da + Db) / 2]} represents the length of the circumference at an intermediate position between the innermost circumference and the outermost circumference of at least one end of the stator winding. Further, (360 / N) represents an angle (slot pitch) between the center lines of the teeth bases adjacent to each other along the circumferential direction.
The distance L3 along the longitudinal direction between the first joining region and the second joining region depends on the length L2 in the longitudinal direction of the first and second joining regions. Are set so as to be spaced apart in the longitudinal direction.
In another different form of the second invention, the distance L4 (mm) between the center along the longitudinal direction of the first joining region and the center along the longitudinal direction of the second joining region is as follows: Is set to satisfy.
L4 = π × [(Da + Db) / 2] × (θ4 / 360)
θ4 = (360 / N)
In this embodiment, the first and second bonding regions can be easily formed.

In another different form of the first invention and the second invention, the insulating member is formed by winding an insulating film in a cylindrical shape and joining it at one end along the longitudinal direction.
For example, a polyester film is used as the insulating film. As the joining method, for example, an ultrasonic welding method is used. Needless to say, various known insulating films can be used as the insulating film, and various known bonding methods can be used as the bonding method.
The insulating member is formed of a wound insulating film, and is formed of a cylindrical body having a joining region at one end along the longitudinal direction and having the other end open, thereby forming a cylinder made of resin or the like. Compared with the case of forming a shape, it can be manufactured at low cost and easily. Moreover, since the opening side is not joined, the operation | work which inserts the front-end | tip part of the edge part of a stator coil | winding in the space of an insulating member is easy. In addition, even when pinholes are generated in the insulating film, the insulating film is disposed on the outer peripheral side or inner peripheral side of the portion where the pinholes are generated, thereby preventing deterioration of the insulating performance due to the pinholes. be able to.
In another different form of the first invention and the second invention, the stator winding is constituted by a first-phase, second-phase, and third-phase stator winding. And the end of one side of the stator windings of the first phase, the second phase and the third phase are arranged along the circumferential direction in a state protruding from the axial end surface of the stator core, respectively. The tip portions of the two are commonly connected to form a neutral point connection portion, and the neutral point connection portion is covered with an insulating member. The other end is connected directly or via a lead wire to a power supply line that supplies current to the stator winding. The neutral point connection is preferably formed by bundling one end of the stator winding of each phase with the insulating film removed, twisting along the circumferential direction, and then welding. It is formed.
In this embodiment, it is possible to prevent the insulating member covering the neutral point connecting portion from being bent in the rotating machine in which the three-phase stator windings are star-connected.
In another different form of the first invention and the second invention, the tip end portion of at least one end of the stator winding is commonly connected to one end of the power supply line, and the power supply line connecting portion is provided. The power connection portion is covered with an insulating member.
In this embodiment, it is possible to prevent bending of the insulating member that covers the connection portion for the power supply line in which the end portion of the stator winding and the power supply line that supplies current to the stator winding are commonly connected.
In another different form of the first invention and the second invention, the leading end portion of at least one end of the stator winding is commonly connected to one end of the lead wire, and the lead wire connecting portion is provided. The lead wire connection portion is covered with an insulating member.
In this embodiment, the insulation for covering the lead wire connecting portion in which the end portion of the stator winding and the lead wire connecting the end portion of the stator winding to the power supply line for supplying current to the stator winding are connected in common. The bending of the member can be prevented.

  In the present invention, it is possible to prevent the cylindrical insulating member that covers the tip of the end of the stator winding from being bent.

It is sectional drawing which looked at the rotary machine of 1st Embodiment from the direction orthogonal to an axial direction. It is the elements on larger scale of FIG. It is an electric circuit diagram of the rotary machine of 1st Embodiment. It is a perspective view of the principal part of the stator core of the rotary machine of 1st Embodiment. It is the elements on larger scale of FIG. It is a figure explaining the method to manufacture the insulating member used with the rotary machine of 1st Embodiment. It is a figure which shows schematic structure of the insulating member used with the rotary machine of 1st Embodiment. It is an electric circuit diagram of the rotary machine of 2nd Embodiment. It is a perspective view of the principal part of the stator core of the rotary machine of 3rd Embodiment. FIG. 10 is a partially enlarged view of FIG. 9. It is a figure explaining the method to manufacture the insulating member used with the rotary machine of 3rd Embodiment. It is a figure which shows schematic structure of the insulating member used with the rotary machine of 3rd Embodiment. It is a perspective view of the principal part of the stator core of the conventional rotary machine. It is the elements on larger scale of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
In the following embodiments, the present invention includes three-phase (U-phase, V-phase, and W-phase) stator windings, and one end of each phase stator winding is commonly connected. A motor connected in a star connection will now be described. Of course, the number of phases is not limited to three phases, and the connection method is not limited to star connection. The present invention can also be configured as a generator.
In the present specification, the “axial direction” indicates the direction of the rotation center line passing through the rotation center in a state where the rotor is rotatably supported with respect to the stator. In addition, the “circumferential direction” refers to a circle centered on the rotation center when viewed in a cross section perpendicular to the axial direction (direction of the rotation center line) in a state where the rotor is rotatably supported with respect to the stator. Indicates direction. The “radial direction” indicates a direction passing through the center of rotation when viewed in a cross section perpendicular to the axial direction in a state where the rotor is rotatably supported with respect to the stator.

  A schematic configuration of a first embodiment of a rotating machine of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the electric motor 100 according to the first embodiment viewed from a direction perpendicular to the axial direction, and FIG. 2 is a partially enlarged view of FIG. FIG. 3 is an electric circuit diagram of the electric motor 100 according to the first embodiment. FIG. 4 is a perspective view of a main part of the stator core of the electric motor 100 according to the first embodiment, and FIG. 5 is a partially enlarged view of FIG.

The electric motor 100 of the present embodiment includes a stator 200 and a rotor 500 that are arranged to be relatively movable.
The stator 200 has a stator core 210 and a stator winding in which a plurality of thin plate-like electromagnetic steel plates are laminated along the axial direction.
The stator core 210 is disposed on the outer peripheral side when viewed in a cross section perpendicular to the axial direction, and extends along the circumferential direction, and extends from the yoke 220 toward the rotation center O along the radial direction. A plurality of teeth 230 and a plurality of slots 240 formed by teeth 230 adjacent in the circumferential direction are provided.
The teeth 230 are formed on the tooth base 231 extending in the radial direction from the yoke 220 toward the rotation center O, and on the tip side (rotor 500 side) of the teeth base 231 and extending along the circumferential direction. It has a tip 232. The teeth base 231 has side walls 231a and 231b on both sides along the circumferential direction. A tooth tip surface 232 a is formed in the tooth tip portion 232 at a location facing the outer peripheral surface 500 a of the rotor 500. Of the teeth 230 adjacent along the circumferential direction, the other side (for example, counterclockwise) of the teeth base portion 231 of the teeth 230 arranged on one side (for example, clockwise side) along the circumferential direction. The slot 240 is formed by the side wall 231a on the one side in the circumferential direction of the side wall 231b on the other side in the circumferential direction and the tooth base portion 231 of the tooth 230 disposed on the other side in the circumferential direction. The teeth tip surface 232a is formed in an arc shape centered on the rotation center O.
A stator winding is wound around the teeth 230.
The rotor 500 is composed of a rotor core in which a plurality of thin plate-shaped electromagnetic steel plates are stacked along the axial direction.
The rotor core has an outer peripheral surface 500a and an inner peripheral surface 500b that forms a rotation shaft insertion hole into which the rotation shaft is inserted. A permanent magnet or the like that forms a rotating magnetic pole is disposed on the rotor core.

As shown in FIG. 3, three-phase (U-phase, V-phase, W-phase) stator windings 251, 252, 253 are wound around teeth 230 of electric motor 100 of the present embodiment. . In the present embodiment, the stator windings 251, 252, and 253 are wound by a distributed winding method. In FIG. 3, the stator windings 251, 252, and 253 of each phase are represented by one winding, but may be configured by a plurality of windings.
Three-phase (U-phase, V-phase, W-phase) stator windings 251, 252, and 253 correspond to the “stator winding” of the present invention.

The end portions 251a, 252a, 253a on one side of the stator windings 251, 252, 253 of each phase are connected in common, and a neutral point connection portion 270 constituting a neutral point of star connection is formed. .
In this embodiment, the ends of the one end portions 251a, 252a, 253a of the stator windings 251, 252, 253 of each phase are bundled with the insulation coating removed, and twisted along the circumferential direction. After that, the neutral point connecting portion 270 is formed by welding. As a method of forming the neutral point connection portion 270, various other methods can be used.
The neutral point connection portion 270 corresponds to the “common connection portion” of the present invention.
The other end portions 251b, 252b, 253b of the stator windings 251, 252, 253 of each phase are connected to one terminal of the connection terminals 291, 292, 293.

In FIG. 3, 10 is a power supply circuit such as an inverter, and three-phase (R-phase, S-phase, T-phase) alternating current is supplied to three-phase (R-phase, S-phase, T-phase) power supply terminals 11, 12, and 13. Supply current. A commercial power supply can also be used as the power supply circuit 10.
One end of three-phase (R-phase, S-phase, T-phase) power supply lines 21, 22, 23 is connected to the power supply terminals 11, 12, 13 of the power supply circuit 10. The other end of each phase power supply line 21, 22, 23 is connected to the other terminal of connection terminals 291, 292, 293.
As the connection terminals 291, 292, and 293, known connection terminals can be used. Further, the other end of the stator windings 251, 252, and 253 and the other end of the power wires 21, 22, and 23 can be directly connected by crimping, welding, or the like.
Three-phase (R-phase, S-phase, T-phase) power lines 21, 22, and 23 correspond to the “power lines” of the present invention.

In the present embodiment, as shown in FIG. 4, one end portions 251a, 252a, 253a and the other end portions 251b, 252b, 253b of the stator windings 251, 252, 253 of each phase. Are arranged along the circumferential direction in a state of protruding (projecting) from the axial end surface 210 a of the stator core 210.
The end portions 251, 252 a, and 253 a on one side of the stator windings 251, 252, and 253 are connected in common to form a neutral point connection portion 270 that forms the neutral point of the star connection. .
The neutral point connection portion 270 is covered with a cylindrical insulating member 400.
Further, the insulating member 400 is composed of one end 251a, 252a, 253a on the one side of the stator windings 251, 252, 253 and the other by a string 280 having an insulating property (also referred to as “binding string” or “binding string”). The side ends 251b, 252b, and 253b are bound to at least one. In the present embodiment, the string 280 binds at least one of the insulating member 400 and one end 251a, 252a, 253a and the other end 251b, 252b, 253b of the stator windings 251, 252, 253. As a rhombus, a method of binding to diagonal crosses (called “turtle tie”) is used. In addition, in FIG. 4, it is tied so that the space | interval along the circumferential direction of the string 280 arrange | positioned below may be substantially equal to the space | interval along the circumferential direction of the string 280 arrange | positioned upward.
As the cord 280, for example, a polyester cord (a cord from polyester, a polyester braided cord), a nomex cord, a PPS cord, a Vectran cord, a polyester / nomex mixed (braided) cord or the like is used. The “string” of the present invention includes a thread.

Next, a method for manufacturing the insulating member 400 used in the electric motor 100 of the present embodiment will be described with reference to FIG.
First, the insulating film 600 is wound many times (in a multilayer shape). In the present embodiment, a polyester film is used as the insulating film 600. Of course, various known insulating films can be used as the insulating film.
Next, in the state where the insulating film 600 is wound, the end on one side along the longitudinal direction is joined. In this embodiment, the insulating film 600 is bonded using an ultrasonic welding method. That is, a horn and a jig that transmit ultrasonic vibration are disposed at the locations indicated by arrows 650 and 660 in FIG. 6, and the insulating film 600 is bonded by ultrasonic vibration and pressure. Of course, as a method of bonding the insulating film 600, various known bonding methods can be used.

The insulating member 400 used in the electric motor 100 of the present embodiment will be described with reference to FIG.
The insulating member 400 is configured by a cylindrical body in which the insulating film 600 is wound in a cylindrical shape. At one end along the longitudinal direction of the cylindrical body, there is a joining region 410 formed by joining the wound insulating film 600. On the other hand, the other end has an opening 400a.
The neutral point connection portion 270 formed by commonly connecting the tip portions of the one end portions 251a, 252a, and 253a of the stator windings 251, 252, and 253 of each phase is an insulating member through the opening 400a. It is inserted into the space 400 (tubular body).

By configuring the insulating member 400 with a cylindrical body in which the insulating film 600 is wound many times (in a multilayer shape) and one end portion along the longitudinal direction is joined, the following advantages are obtained.
Compared to the case where the cylindrical body is formed of resin or the like, it can be manufactured at low cost and easily.
Even when pinholes are generated in the insulating film 600, the insulating film is disposed on the outer peripheral side or the inner peripheral side of the portion where the pinholes are generated, so that deterioration of the insulating performance due to the pinholes is prevented. Can do.
Since the opening 400 a side is not joined, the neutral point connection portion 270 can be easily inserted from the opening 400 a of the insulating member (tubular body) 400.

As described above, when the length L1 along the longitudinal direction of the joining region 410 of the insulating member 400 is short and only one string 280 is disposed in the joining region 410, the tip side of the insulating member 400 (opening 400a). The opposite side) may be bent.
As shown in FIG. 5, the present inventors arrange the two cords 280 in the joining region 410, that is, the stator windings 251, 252 are joined to the joining region 410 by the two cords 280. It was found that the distal end side of the insulating member 400 can be prevented from being bent by binding to the end portions 251a, 252a, 253a on one side of the H.253 and the end portions 251b, 252b, 253b on the other side.

Next, conditions for arranging the two strings 280 in the joining region 410 will be described with reference to FIGS.
Basically, the string 280 that binds the one end portions 251a, 252a, and 253a and the other end portions 251b, 252b, and 253b of the stator windings 251, 252, and 253 is the teeth 230 of the stator core 210. The tooth base 231 is arranged at the center line P (a line connecting the center point of the tooth base 231 in the circumferential direction and the rotation center O of the rotor 500). In this case, the angle between the strings 280 adjacent in the circumferential direction is an angle θa between the center lines P of the teeth 230 adjacent in the circumferential direction.
Here, one end portions 251a, 252a, 253a and the other side of the stator windings 251, 252, 253 are arranged along the circumferential direction in a state of protruding from the axial end surface 210a of the stator core 210. The innermost diameters of the end portions 251b, 252b, and 253b are Da (mm), and the outermost diameter is Db (mm) (see FIG. 4). Further, the insulating member 400 is positioned at an intermediate position between the innermost and outermost ends of the one end portions 251a, 252a, and 253a and the other end portions 251b, 252b, and 253b of the stator windings 251, 252, and 253. Shall be placed.
In this case, in order to arrange the two strings 280 arranged at the positions of the center lines P of the tooth bases 231 of the teeth 230 adjacent to each other in the circumferential direction in the joining region 410 of the insulating member 400, the joining region The length L1 (mm) along the longitudinal direction of 410 needs to satisfy the following (Formula 1).
L1 ≧ π × [(Da + Db) / 2] × (θa / 360) (Formula 1)

However, the position of the string 280 is moved, for example, during the operation of binding the ends 251a, 252a, 253a on one side and the ends 251b, 252b, 253b on the other side with the string 280 of the stator windings 251, 252, 253. There is.
Here, the arrangement position of the string 280 is allowed as long as it is within the range of the teeth base portion 231 of the teeth 230 of the stator core 210.
Therefore, an allowable range of the arrangement position of the string 280 is examined.

The minimum allowable angle between the adjacent strings 280 along the circumferential direction is formed by the teeth 230 adjacent along the circumferential direction among the side walls of the teeth base portion 231 of the teeth 230 adjacent along the circumferential direction. The angle between the sidewalls facing the slot 240. That is, the line Pb connecting the side wall 231b on the other direction side along the circumferential direction and the rotation center O of the tooth base portion 231 of the tooth 230 on the one direction side along the circumferential direction, and the tooth on the other direction side along the circumferential direction. An angle θb between a line Pa connecting the side wall 231a on one side of the tooth base portion 231 along the circumferential direction and the rotation center O is the allowable minimum angle.
In this case, in order to arrange the two strings 280 arranged at the respective positions of the lines Pa and Pb adjacent to each other in the circumferential direction in the joining region 410 of the insulating member 400, along the longitudinal direction of the joining region 410. The length L1 (mm) needs to satisfy the following (Formula 2).
Note that the angle between the line Pa passing through the center line P of the tooth 230 and the side wall 231a of the tooth base 231 or the angle between the center line P and the line Pb passing through the side wall 231b of the tooth base 231 is the slot pitch (θa = 360 / N ) 0.3 times or less.
L1 ≧ L1min
L1min = π × [(Da + Db) / 2] × (θ1min / 360)
θ1min = (360 / N) − [(360 / N) × 0.3 × 2] (Formula 2)

The maximum allowable angle between the adjacent strings 280 along the circumferential direction is formed by the teeth 230 adjacent along the circumferential direction among the side walls of the teeth base portion 231 of the teeth 230 adjacent along the circumferential direction. The angle between the side walls not facing the slot 240. That is, the line Pa connecting the side wall 231a on one side along the circumferential direction and the rotation center O of the tooth base 231 of the tooth 230 on the one side along the circumferential direction, and the tooth on the other side along the circumferential direction. An angle θc between a line Pb connecting the side wall 231b on the other direction side along the circumferential direction of the tooth base portion 231 of the 230 and the rotation center O is an allowable maximum angle.
In this case, in order to arrange the two strings 280 arranged at the respective positions of the lines Pa and Pb adjacent to each other in the circumferential direction in the joining region 410 of the insulating member 400, along the longitudinal direction of the joining region 410. The length L1 (mm) needs to satisfy the following (Formula 3).
L1max ≧ L1
L1max = π × [(Da + Db) / 2] × (θ1max / 360)
θ1max = (360 / N) + [(360 / N) × 0.3 × 2] (Formula 3)

In the first embodiment, the neutral member connection portion 270 in which the tip portions of the one end portions 251a, 252a, and 253a of the three-phase stator windings 251, 252, and 253 are connected in common is the insulating member 400. Although it covered, the front-end | tip part of edge part 251b, 252b, 253b of the other side can also be covered with an insulating member.
The electric motor 100 of 2nd Embodiment is demonstrated with reference to FIG. FIG. 8 is an electric circuit diagram of the electric motor 100 according to the second embodiment.
In the electric motor 100 of the second embodiment shown in FIG. 8, the other end portions 251b, 252b, 253b of the stator windings 251, 252, 253 are connected to the power supply line 21, via the lead wires 261, 262, 263, Except for the point connected to 22 and 23, it is the same structure as the electric motor 100 of 1st Embodiment shown by FIG. Therefore, only the configuration different from the electric motor 100 of the first embodiment will be described below.

The other ends 251 b, 252 b, 253 b of the stator windings 251, 252, 253 are arranged along the circumferential direction in a state of protruding from the axial end surface 210 a of the stator core 210.
The tip portions of the other end portions 251b, 252b, and 253b of the stator winding are connected in common to the one end portions of the lead wires 261, 262, and 263, respectively, and lead wire connection portions 271, 272, and 273 are provided. It is formed. The method described above can be used as a method of connecting the tip end portions of the other end portions 251b, 252b, and 253b of the stator winding and the end portions of the lead wires 261, 262, and 263.
The lead wire connecting portions 271, 272, and 273 are covered with insulating members 401, 402, and 403, respectively. As the insulating members 401, 402, and 403, the same members as the insulating member 400 used in the first embodiment can be used.
And the joining area | region (illustration omitted) of the insulating members 401, 402, and 403 is the end part 251a, 252a of one side of the stator windings 251, 252, and 253 by the string 280 similarly to the joining area | region 410 of the insulating member 400. 253a and the other end 251b, 252b, 253b.
The other ends of the lead wires 261, 262, and 263 are connected to terminals on one side of the connection terminals 291, 292, and 293.
The lead wires 261, 262, 263 correspond to the “lead wire” of the present invention.

In the second embodiment, the other end portions 251b, 252b, and 253b of the stator windings 251, 252, and 253 are connected to the power supply lines 21, 22, and 23 via lead wires 261, 262, and 263, respectively. However, it can also be connected directly to the power supply lines 21, 22, and 23.
In this case, the tip ends of the other end portions 251b, 252b, and 253b of the stator winding are commonly connected to the other end portions of the power supply lines 21, 22, and 23, respectively. It is formed.
The power line connecting portions are covered with insulating members 401, 402, and 403, respectively.
And the joining area | region of the insulating members 401, 402, and 403 is the end part 251a, 252a, 253a of one side of the stator windings 251, 252, and 253 with the string 280 similarly to the joining area | region 410 of the insulating member 400, and the other. The side ends 251b, 252b, and 253b are bound to at least one.

  Further, in the second embodiment, a common connection portion in which the tip portions of one end portions of the stator windings of the respective phases are connected in common, and the tip portion of the other end portion of the stator windings of the respective phases. Is covered with an insulating member, or connected to the end of the lead wire or connected to the end of the power supply line. What is necessary is just to cover the front-end | tip part of an edge part with the insulating member.

In the first and second embodiments, the insulating member having one joining region at the end portion on one side along the longitudinal direction is used, but insulating members having other configurations can also be used.
The electric motor 100 of 3rd Embodiment is demonstrated with reference to FIG. 9, FIG. FIG. 9 is a perspective view of a main part of the stator core of the electric motor 100 according to the third embodiment, and FIG. 10 is a partially enlarged view of FIG.
The electric motor 100 of the present embodiment has the same configuration as the electric motor 100 of the first embodiment except for the configuration of the insulating member.
Therefore, hereinafter, only the insulating member 700 used in the electric motor 100 of the third embodiment will be described.

The insulating member 700 used in the electric motor 100 of the present embodiment includes a first joining region 710 and a second joining region that are spaced apart along the longitudinal direction at one end along the longitudinal direction. A bonding region 720 is included.
A method of manufacturing the insulating member 700 used in the electric motor 100 of the present embodiment will be described with reference to FIG.
First, the insulating film 600 is wound many times (in a multilayer shape). In the present embodiment, a polyester film is used as the insulating film 600 as in the first embodiment.
Next, in the state where the insulating film 600 is wound, the end on one side along the longitudinal direction is joined. In the present embodiment, two portions of the end portion on one side along the longitudinal direction of the cylindrical body that are separated along the longitudinal direction are joined. As a joining method, an ultrasonic vibration welding method is used as in the first embodiment. That is, a horn and a jig for transmitting ultrasonic vibration are disposed at the locations indicated by arrows 750 and 760 and the locations indicated by arrows 770 and 780 in FIG. 11, and the insulating film 700 is joined by ultrasonic vibration and pressure. Yes.

An insulating member insulating member 700 used in the electric motor 100 of the present embodiment will be described with reference to FIG.
The insulating member 700 is configured by a cylindrical body in which the insulating film 600 is wound in a cylindrical shape. At one end along the longitudinal direction of the cylindrical body, there are a first joining region 710 and a second joining region 720 formed by joining the wound insulating film 600. On the other hand, an opening 700a is provided at the other end.
The neutral point connection portion 270 formed by commonly connecting the tip portions of the end portions 251a, 252a, and 253a on one side of the stator windings 251, 252, and 253 of each phase is an insulating member through the opening 700a. It is inserted into the space 700 (cylindrical body).

  In the present embodiment, in order to prevent the distal end side of the insulating member 700 from being bent, as shown in FIG. 10, the first bonding region 710 and the second bonding that are separated along the longitudinal direction are used. By arranging the two strings 280 adjacent to each other in the circumferential direction in the area 720, that is, two strings adjacent to each other in the circumferential direction in the first bonding area 710 and the second bonding area 720. 280 is bound to at least one of one end portions 251a, 252a, and 253a and the other end portions 251b, 252b, and 253b of the stator windings 251, 252, and 253, respectively.

Next, conditions for disposing each of the two strings 280 adjacent to each other in the circumferential direction in the first bonding region 710 and the second bonding region 720 will be described with reference to FIGS.
As described above, basically, the string 280 that binds the one end portions 251a, 252a, and 253a and the other end portions 251b, 252b, and 253b of the stator windings 251, 252, and 253 is the stator. Although arranged at the position of the center line P of the teeth base 231 of the teeth 230 of the core 210, the one ends 251a, 252a, 253a and the other ends 251b, 252b of the stator windings 251, 252, 253 are arranged. The position of the string 280 may move during work of binding the H.253b with the string 280 or the like.
The arrangement position of the string 280 is allowed as long as it is within the range of the teeth base portion 231 of the teeth 230 of the stator core 210.
Therefore, an allowable range of the arrangement position of the string 280 is examined.

The minimum allowable angle between the adjacent strings 280 along the circumferential direction is formed by the teeth 230 adjacent along the circumferential direction among the side walls of the teeth base portion 231 of the teeth 230 adjacent along the circumferential direction. The angle between the sidewalls facing the slot 240. That is, the line Pb connecting the side wall 231b on the other direction side along the circumferential direction and the rotation center O of the tooth base portion 231 of the tooth 230 on the one direction side along the circumferential direction, and the tooth on the other direction side along the circumferential direction. An angle θb between a line Pa connecting the side wall 231a on one side of the tooth base portion 231 along the circumferential direction and the rotation center O is the allowable minimum angle.
In this case, the two strings 280 arranged at the respective positions of the lines Pa and Pb adjacent in the circumferential direction are separated from the first joining region 710 of the insulating member 700 which is separated in the longitudinal direction. In order to arrange in each of the two joining regions 720, the length L2 (mm) along the longitudinal direction of the first joining region 710 and the second joining region 720 needs to satisfy the following (Formula 4). There is.
L2> L2min
L2min = π × [(Da + Db) / 2] × (θ2min / 360)
θ2min = {(360 / N) − [(360 / N) × 0.3 × 2]} / 2
(Formula 4)

The maximum allowable angle between the adjacent strings 280 along the circumferential direction is formed by the teeth 230 adjacent along the circumferential direction among the side walls of the teeth base portion 231 of the teeth 230 adjacent along the circumferential direction. The angle between the side walls not facing the slot 240. That is, the line Pa connecting the side wall 231a on one side along the circumferential direction and the rotation center O of the tooth base 231 of the tooth 230 on the one side along the circumferential direction, and the tooth on the other side along the circumferential direction. An angle θc between a line Pb connecting the side wall 231b on the other direction side along the circumferential direction of the tooth base portion 231 of the 230 and the rotation center O is an allowable maximum angle.
In this case, the two strings 280 arranged at the respective positions of the lines Pa and Pb adjacent in the circumferential direction are separated from the first joining region 710 of the insulating member 700 which is separated in the longitudinal direction. In order to arrange in each of the two joining regions 720, the length L2 (mm) along the longitudinal direction of the first joining region 710 and the second joining region 720 needs to satisfy the following (Formula 5). There is.
L2max> L2
L2max = π × [(Da + Db) / 2] × (θ2max / 360)
θ2max = {(360 / N) + [(360 / N) × 0.3 × 2]} / 2
(Formula 5)

Preferably, a distance L4 (mm) between the center along the longitudinal direction of the first joining region 710 and the center along the longitudinal direction of the second joining region 720 is expressed by the following (Equation 6). It is preferable to set so as to satisfy the above.
L4 = π × [(Da + Db) / 2] × (θ4 / 360)
θ4 = (360 / N) (Formula 5)
Further, the distance L3 along the longitudinal direction between the first joining region 710 and the second joining region 720 is set to a length L2 along the longitudinal direction of the first joining region 710 and the second joining region 720, or the like. It is set accordingly.

The present invention is not limited to the configuration described in the embodiment, and various modifications, additions, and deletions can be made without departing from the gist of the present invention.
The insulating member is not limited to the insulating member having the configuration described in the embodiment.
We have explained a motor with three-phase stator windings star-connected, but the number of phases of the stator windings can be changed as appropriate, including single-phase, and the stator winding connection method is limited to star-connection. Not.
Although the common connection part which connected the front-end | tip part of the edge part of the one side of a three-phase stator winding in common was covered with the insulating member, this invention of the edge part of the at least one side of at least 1 stator winding It can comprise as a rotary machine which covered the front-end | tip part with the insulating member.
The turtle binding method is used as a method of binding the insulating member to the end of the stator winding, but is not limited to this.
The one end and the other end of the stator winding are projected from the same axial end surface of the stator core, but the one end of the stator winding is connected to one side of the stator core. It is also possible to project from the axial end surface of the other end and project the other end from the other axial end surface.
As a method for joining the insulating films wound in a cylindrical shape, various known joining methods can be used.
The method for manufacturing the insulating member using the insulating film is not limited to the manufacturing method described in the embodiment.
Although the electric motor has been described, the present invention can also be configured as a generator.

10 Power supply circuit 11, 21, 31 Power supply terminal 21, 22, 23 Power supply line 100, 800 Electric motor 200, 810 Stator 210, 820 Stator core 210a, 820a Axial end face 220 Yoke 230 Teeth 231 Teeth base 231a, 231b Side wall 232 Teeth tip 232a Teeth tip surface 240 Slots 251, 252, 253, 831, 832, 833 Stator windings 251a, 252a, 253a, 831a, 832a, 833a Ends 251b, 252b, 253b Ends 261, 262, 263 Lead Wire 261a, 262a, 263a End portion 261b, 262b, 263b End portion 270 Neutral point connection portion 271, 272, 273 Lead wire connection portion 400, 401, 402, 403, 700, 850 Insulating member 280, 840 String 400 , 700a opening 410,710,720,860 junction (junction region)
291, 292, 293 Connection terminal 500 Rotor 500a Outer peripheral surface 500b Inner peripheral surface 600 Insulating film

Claims (9)

It has a rotor and a stator that are arranged to be relatively movable,
The stator includes a stator core and a stator winding, and the stator core includes a yoke extending along a circumferential direction when viewed in a cross section orthogonal to the axial direction, and a radial direction from the yoke. A plurality of teeth extending along the circumferential direction and a plurality of slots formed by the teeth adjacent along the circumferential direction, and the stator winding is wound around the teeth;
The end of at least one side of the stator winding is disposed along the circumferential direction in a state of protruding from the axial end surface of the stator core, and the tip is covered with an insulating member,
The insulating member is a rotating machine that is bound to at least one end of the stator winding by a string that is spaced apart along the circumferential direction,
The insulating member is formed in a cylindrical shape, and has a bonding region at one end along the longitudinal direction,
The length L1 along the longitudinal direction of the joining region is such that the joining region is bound to at least one end of the stator winding by two strings adjacent in the circumferential direction. A rotating machine characterized by being set. The rotating machine according to claim 1,
The number of slots is N, the innermost diameter of at least one end of the stator windings arranged along the circumferential direction is Da (mm), and the outermost diameter is Db (mm). The length L1 (mm) along the longitudinal direction of the joining region is
L1min ≦ L1 ≦ L1max
L1min = π × [(Da + Db) / 2] × (θ1min / 360)
θ1min = (360 / N) − [(360 / N) × 0.3 × 2]
L1max = π × [(Da + Db) / 2] × (θ1max / 360)
θ1max = (360 / N) + [(360 / N) × 0.3 × 2]
A rotating machine characterized in that it is set to satisfy It has a rotor and a stator that are arranged to be relatively movable,
The stator includes a stator core and a stator winding, and the stator core includes a yoke extending along a circumferential direction when viewed in a cross section orthogonal to the axial direction, and a radial direction from the yoke. A plurality of teeth extending along the circumferential direction and a plurality of slots formed by the teeth adjacent along the circumferential direction, and the stator winding is wound around the teeth;
The end of at least one side of the stator winding is disposed along the circumferential direction in a state of protruding from the axial end surface of the stator core, and the tip is covered with an insulating member,
The insulating member is a rotating machine that is bound to at least one end of the stator winding by a string that is spaced apart along the circumferential direction,
The insulating member is formed in a cylindrical shape, and has a first bonding region and a second bonding region that are separated along the longitudinal direction at one end portion along the longitudinal direction. And
A length L2 along the longitudinal direction of the first joining region and the second joining region, and an interval L3 along the longitudinal direction between the first joining region and the second joining region are: The first joining region and the second joining region are set so as to be bound to at least one end portion of the stator winding by each of the two strings adjacent in the circumferential direction. A rotating machine characterized by that. The rotating machine according to claim 3,
The number of slots is N, the innermost diameter of at least one end of the stator windings arranged along the circumferential direction is Da (mm), and the outermost diameter is Db (mm). In this case, the length L2 (mm) along the longitudinal direction of the first joint region and the second joint region is
L2min <L2 <L2max
L2min = π × [(Da + Db) / 2] × (θ2min / 360)
θ2min = {(360 / N) − [(360 / N) × 0.3 × 2]} / 2
L2max = π × [(Da + Db) / 2] × (θ2max / 360)
θ2max = {(360 / N) + [(360 / N) × 0.3 × 2]} / 2
A rotating machine characterized in that it is set to satisfy The rotating machine according to claim 4,
An interval L4 (mm) between the center along the longitudinal direction of the first joining region and the center along the longitudinal direction of the second joining region is,
L4 = π × [(Da + Db) / 2] × (θ4 / 360)
θ4 = (360 / N)
A rotating machine characterized in that it is set to satisfy It is a rotary machine as described in any one of Claims 1-5,
The said insulating member is formed by winding an insulating film in a cylinder shape and joining at the edge part of the one side along a longitudinal direction. It is a rotary machine as described in any one of Claims 1-6,
The stator winding is composed of first-phase, second-phase and third-phase stator windings,
Ends on one side of the stator windings of the first phase, second phase and third phase are arranged along the circumferential direction in a state protruding from the axial end surface of the stator core, respectively. The rotating machine is characterized in that the tip portions of the two are commonly connected to form a neutral point connection portion, and the neutral point connection portion is covered with the insulating member. It is a rotary machine as described in any one of Claims 1-6,
A tip portion of at least one end of the stator winding is commonly connected to one end of a power supply line to form a power supply connection portion, and the power supply connection portion is covered with the insulating member. A rotating machine characterized by that. It is a rotary machine as described in any one of Claims 1-6,
A leading end portion of at least one end of the stator winding is commonly connected to one end of the lead wire to form a lead wire connecting portion, and the lead wire connecting portion is covered with the insulating member. A rotating machine characterized by

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