JPH07163075A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To alleviate a thermal stress applied on a coil insulator which is generated during the cooling and heating cycle of the windings of a rotor and a stator. CONSTITUTION:A winding 3 is inserted into a slot 2 of a core 1 of a rotary electric machine and a wedge 21 is also inserted thereto. A pair of heat insulating members 4a, 4b are counterposed at an area (for example, at the area between the wedge and winding), where a high surface pressure is applied, on a winding insulator 3b in the slot 2 and one heat insulating member 4a among these members is bonded with a winding insulator 3a so that it moves in the axial direction depending on thermal expansion of winding and contraction thereby by temperature drop. Meanwhile, the other heat insulating member 4b is fixed to a core and slidable members 5a, 5b having small friction coefficients are provided between the movable heat insulating member 4a and the fixed heat insulating member 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine, and more particularly to a mounting structure in a slot of a winding of a large rotating electric machine such as a large capacity induction motor.

[0002]

2. Description of the Related Art Conventionally, as a winding mounting structure for a rotor or a stator of a rotary electric machine, a winding having an insulating coating around the conductor is inserted, and a wedge is mounted on the upper portion of the slot to wind the winding in the slot. Fixed lines are well known.

As an example thereof, FIG. 8 shows a conventional slot inner structure of a two-layer winding type rotor.

In the conventional slot inner structure of a wound type rotor core, slots 18 are arranged in the circumferential direction of a rotor core 17 made by laminating thin electromagnetic steel plates, and usually one slot has two upper and lower layers. The rotor windings 19 and 20 are inserted, and a wedge 21 is attached to the upper portion of the slot 18 to fix the windings 19 and 20.

The shape of the rotor winding is different from that of the convex pole type, and ground insulation 19b, 20b is wound around the conductors 19a, 20a composed of a plurality of electric wires preliminarily shaped in a hexagonal shape, and slotted. Has been inserted inside.

In the large-capacity induction motor, the applied voltage to the rotor winding is required to have a higher voltage than that of the conventional salient pole type winding, so that the electrically and mechanically strong insulating materials 19b and 20b are required. .

A dovetail groove 24 is machined over the entire length in the axial direction in the outer diameter direction of each slot 18, and the wedge 21 is driven into the dovetail groove 24 through an insulating protective liner 23 to prevent centrifugal force. The structure is such that the rotor winding is firmly fixed in the slot.

The internal structure of the slot on the stator side is similar to the above.

The prior art of this type of rotary electric machine includes, for example, Japanese Patent Laid-Open Nos. 56-83237 and 57-9.
5162, JP-A-58-182443, JP-A-63-167646, JP-A-1-34143.
Japanese Patent Laid-Open No. 2-294242 and the like.

[0010]

However, the conventional in-slot structure has the following points to be improved.

For example, in a large-capacity induction motor having a large rotor winding with a high rotation speed and a high rotation speed, the rotor winding conductor tends to thermally expand in the axial direction due to the temperature rise due to the operation. Since the rotor winding insulation, which is subjected to a high surface pressure due to a strong centrifugal force, is constrained in the slots, it cannot follow the thermal expansion of the conductor, and excessive shearing force acts between the winding insulation material and the conductor. However, this may cause damage to the insulating layer.

That is, the centrifugal force exerted on the winding insulation during the operation of the large capacity induction motor is great. On the other hand, the lengthened winding is repeatedly subjected to cooling / heating cycles under severe conditions such as frequent start / stop, load fluctuations, and high surface pressure (Joule heat is generated by the current flowing through the conductor, and the generated heat The winding will repeatedly expand or contract according to the change of the).

However, during operation, a high surface pressure due to centrifugal force is applied to the rotor winding insulating surface, and the friction coefficient of the contact portion of the insulating surface is large. Therefore, the winding insulating restrains the movement inside the slot. As a result, the conductor cannot follow the thermal expansion of the conductor and can freely expand, and excessive thermal stress is generated in the shearing direction at the boundary surface between the insulation and the conductor. This thermal stress increases as the friction coefficient increases.

As the operating state changes to the stopped state, the surface pressure due to the centrifugal force decreases, and the restraining force due to friction also decreases accordingly, so that the thermal stress is gradually released and decreases. When the thermal cycle is repeatedly performed under such conditions for a long period of time, the insulating layer and the conductor bonding surface are separated, and the insulating layer is also separated, causing an excessive internal discharge between the voids and finally This will cause dielectric breakdown.

As a countermeasure against the heat expansion as described above, conventionally, a method of directly applying a lubricating paint to the sliding portion on the surface of the winding insulating material to lower the coefficient of friction has been taken. However, the surface temperature of the winding insulation material during operation rises due to the Joule heat of the inner conductor, and the friction coefficient of the lubricating coating tends to increase as shown in FIG. The thermal expansion of the winding insulation material was restricted, and the winding insulation material could not be slid sufficiently in the slot.

[0016] The above-mentioned problems are most problematic especially in the places where high surface pressure is applied to the rotor windings by the action of the rotating centrifugal force. In addition, the wedge windings are also generated when the operation of the rotating electric machine is stopped. There is a portion where the surface pressure increases due to the pressing force, and the same problem may occur even when the winding contracts due to the temperature drop. Further, the same applies to the slot structure on the stator side in addition to the wound rotor, although the degree is different.

In the stator side winding as well, since the winding fixed in the slot of the stator is fixed by the wedge, the force due to the wedge acts on the winding and the surface pressure acting on the winding is increased. This is because it can be high.

The object of the present invention is to pay attention to the above problems and to mitigate the thermal stress acting between the windings and the insulation generated during the cooling / heating cycle of the rotor winding or the stator winding, and to improve the insulation over time. It is to provide a highly reliable rotating electric machine by preventing peeling and damage of parts.

[0019]

In order to achieve the above object, the present invention basically proposes the following means for solving the problems.

That is, a winding whose conductor is surrounded by an insulating material in slots arranged in the circumferential direction of a core of a rotating electric machine (the core may be either a rotor core or a stator core) In a rotary electric machine in which a wedge is attached to the upper part of this slot to fix the winding wire in the slot, a pair of heat insulating members is applied to the place where a high surface pressure is applied on the winding insulating material in the slot. Place them facing each other,
One of the heat insulating members is bonded to the winding insulating material to be a movable side that moves in the axial direction following the contraction of the winding due to thermal expansion and temperature drop, and the other is fixed to the core as a fixed side. A sliding member having a small friction coefficient is interposed between the side heat insulating member and the fixed heat insulating member.

For example, in the case of a rotor winding, this high surface pressure is applied between the wedge and the winding, which are the outer diameter portion of the slot, due to centrifugal force during operation. When the operation is stopped, the surface pressure is applied not only between the wedge and the winding but also between the bottom of the slot and the winding due to the pressing force of the wedge (in the case of the stator winding) In addition, the pressing force of the wedge applies surface pressure between the bottom of the slot and the winding, in addition to between the wedge and the winding).

In any case, the pair of heat insulating members and the sliding member interposed therebetween may be provided at appropriate places depending on the degree of high surface pressure.

[0023]

For example, in the case of a wound type rotor, centrifugal force acts on the winding by rotating at a high speed, as described above,
Especially high surface pressure is applied between the wedge and winding.

Even in the case where Joule heat is generated in the conductor in such a state and the winding is repeatedly expanded (thermally expanded) and contracted in accordance with the change in the generated heat, one of the pair of heat insulating members is formed. (The movable side heat insulating member) is bonded on the insulating material of the winding, and the other (the fixed side heat insulating member) is fixed to the core side,
Moreover, since a sliding member having a small coefficient of friction is interposed between these heat insulating members, the winding insulating material serves as a fixed side heat insulating member together with the movable side heat insulating member bonded to the winding side due to thermal expansion and contraction of the conductor. Sliding smoothly (relatively moving).

Further, since the sliding member is interposed between the heat insulating members, the presence of these heat insulating members suppresses the heat generated from the winding from being conducted from the surroundings to the sliding member side. Prevents the friction coefficient of the sliding member from increasing due to heat. Therefore, the thermal expansion of the entire winding due to the above-mentioned sliding is ensured, and the thermal insulation of the conductor is made to follow the thermal expansion and contraction of the conductor even if the thermal cycle is repeated, and excessive thermal stress is applied to the winding insulation. To maintain the integrity of the winding.

[0026]

Embodiments of the present invention will be described with reference to FIGS.

FIG. 1 shows a sectional structure inside a slot of a wire-wound rotor according to a first embodiment of the present invention.

In FIG. 1, a rotor winding 3 is inserted into each slot 2 arranged in the circumferential direction of a rotor core 1 formed by stacking electromagnetic steel sheets in a cylindrical shape, and a wedge 21 is inserted into a dovetail 24 above the slot 2. Is attached.

The wedge 21 has heat insulating members 4a and 4b with sliding members 5a and 5b, which will be described later, in addition to the winding 3 in the slot 2.
After being inserted, the dovetail 24 machined into the outer diameter portion of the slot is driven in from the axial direction of the rotor. The rotor winding 3 is firmly fixed in the slot 2 by the wedge 21. The rotor winding 3 is formed by winding a conductor 3a formed by adhering a plurality of strands around an insulating material 3b mainly composed of mica having excellent withstand voltage and compression resistance.

A pair of heat insulating members 4a and 4b facing each other is arranged between the wedge 21 and the winding 3 of the slot 2. As the heat insulating members 4a and 4b, glass-based FRP is desirable from the both sides of mechanical strength and thermal conductivity. Glass-based FRP
The thermal conductivity of is generally about the same as that of mica, which is the main insulation of the rotor winding, and shows good heat insulation characteristics. The temperature can be lowered to the rise.

Of the heat insulating members 4a and 4b, the heat insulating member 4a is bonded to the outer surface of the winding 3 (the surface of the insulating material 3b) to form a movable side heat insulating member, and the winding 3 is generated by the heat generated by the conductor during operation.
It is designed to move along with the heat expansion in the longitudinal direction.

To bond both the heat insulating member 4a and the winding 3,
A semi-cure insulating material 6 in which a non-woven fabric is used as a part of a base material and a thermosetting adhesive is impregnated is preferable in order to fill unevenness on the surface of the insulating layer and prevent uneven contact at high surface pressure during rotation. What happens is that under high surface pressure generated by the centrifugal force of high-speed rotation, if one-sided contact occurs at the contact portion between the insulating layer surface and the heat insulating member,
A portion of the surface of the insulating layer that receives a surface pressure locally occurs, and the insulating layer that cannot withstand the surface pressure is crushed and mechanically damaged, and further, an electrical breakdown occurs. Since the heat insulating member 4a moves in accordance with the thermal expansion of the winding 3 in the axial direction, the heat insulating member of a long object has a different thermal expansion coefficient.
A short length is desirable because an excessive shearing force acts between the insulating layer and the heat insulating member and the adhesive surface is broken.

On the other hand, the heat insulating member 4b is fixed to the core side by using an air duct of the rotor core 1 or the like so as not to move in the longitudinal direction by a stopper, and serves as a fixed side heat insulating member.

Sliding members 5a and 5b having a small friction coefficient are interposed between the heat insulating members 4a and 4b to smooth relative movement (sliding) between the heat insulating members. The sliding members 5a, 5b are made of, for example, aramid papers 5a, 5b excellent in abrasion resistance, the surfaces of which are smoothly processed by a heat roll (so-called calendering). The entire length is attached to each facing surface (sliding surface) of 4b.

The sliding surface of the aramid paper is coated with a tetrafluoroethylene-based paint which is often used as a lubricating material for reducing the friction coefficient.

According to this embodiment, the centrifugal force acts on the winding 3 due to the high-speed rotation of the wire-wound rotor, and particularly the wedge 21.
・ High surface pressure is applied between the windings 3. In such a state, even when Joule heat is generated in the conductor 3a and the winding 3 repeatedly expands (thermally expands) and contracts according to the change in the generated heat, one of the pair of heat insulating members 4a Is bonded to the winding insulating material 3b, the other 4b is fixed to the core 1 (slot 2) side, and sliding members 5a and 5b having a small friction coefficient are interposed between these heat insulating members 4a and 4b. Therefore, the winding insulating material 3b smoothly moves relative to the other heat insulating member 4b together with the heat insulating member 4a following the heat expansion and contraction of the conductor 3a due to the temperature drop.

Further, the heat insulating members 4a and 4b prevent the heat generated from the winding 3 from being transmitted from the surroundings to the sliding members 5a and 5b, and lower the temperature of the sliding portion below the winding insulating surface temperature to reduce the friction coefficient. Prevent the rise.

That is, generally, a lubricating material (sliding member)
Shows a good low coefficient of friction at room temperature, but as the temperature rises, the coefficient of friction increases as shown by the characteristic curve in FIG.
During operation, it acts so as to prevent thermal expansion of the winding in the axial direction.

However, in this embodiment, the heat insulating member 4
The a and 4b suppress the heat from the winding 3, which is a heating element, from being conducted to the sliding members 5a and 5b, and the heat insulating members 4a and 4b.
4b The surface temperature (sliding surface temperature) is about 1 with respect to the conductor core wire.
By increasing the temperature by 1/2, the sliding surfaces 5a and 5b can be maintained in the low friction coefficient range, and the thermal expansion of the winding can be slid without being restricted in the slot. Moreover, the object can be achieved almost in the same manner by applying silicon oil as a moisturizing agent to the surface of aramid paper instead of ethylene tetrafluoride.

FIG. 3 shows a second embodiment of the present invention.

As in the first embodiment, in this embodiment as well, the movable surface of the winding insulating material 3b is bonded between the wedge 21 and the winding 3 where the high surface pressure of the winding is applied by the rotating centrifugal force of the rotor. The fixed side heat insulating member 4b and the sliding members 5a and 5b interposed between the fixed side heat insulating member 4b and the side heat insulating member 4a are provided in the slot 2. In order to have a sliding structure, the winding insulation material 3
Two (a pair of) slot liners 7a and 7b are mounted so as to face each other on the outer periphery of b (the left and right side surfaces and the bottom surface, in other words, between the slot wall surface and the winding facing the slot wall surface). Of these, one slot liner 7a is movably adhered to the surface of the winding insulating material 3b following the thermal expansion of the winding 3, and the other slot liner 7b is fixed to the slot wall.

As the material for the slot liners 7a and 7b, a semiconductive material based on an aramid material is desirable from the viewpoint of wear resistance and heat insulation. The contact surfaces of both slot liners 7a and 7b are coated with ethylene tetrafluoride paint, which is often used as a lubricant paint, to reduce the friction coefficient.

During operation, the winding is in the direction of centrifugal force (outer peripheral direction).
The thermal expansion in the longitudinal direction of the winding at this time is mainly caused by the sliding structure shown in the first embodiment, and the binding force of the winding in the slot 2 is reduced. On the other hand, in the state immediately after the operation is stopped, the constraint force by the wedge 21 in the slot inner diameter direction acts, and the winding shrinks as the winding conductor temperature decreases. At this time, the sliding structure 7 formed of the slot liner in the slot inner diameter direction effectively acts without restraining the shrinkage of the winding. Since the winding temperature is gradually lowered, the friction coefficient of the sliding surface coated with the ethylene tetrafluoride-based coating is also lowered, and good sliding characteristics can be obtained. Example 1
Similar effects can be obtained by applying silicone oil to the sliding surface in the same manner as in.

FIG. 4 shows a third embodiment. Although the application example of the aramid paper is shown as the sliding member in the above-mentioned first embodiment,
In this embodiment, an example in which an elastic body is applied instead of aramid paper is shown.

As the elastic body, silicon rubbers 8a and 8b subjected to lubricity treatment are applied. Generally, various materials used for the inside of the slot 2 such as the liner and the winding wire 2 are initially firmly fixed in the slot by the wedge 21, but the deterioration gradually progresses over time, and the wedge loosens. Appears. In order to prevent such loosening of the wedge, the heat insulating member 4a,
By applying an elastic member having slidability between 4b and contracting the elastic members 8a and 8b in advance and inserting them into the slot 2, in addition to the effects already described in the first and second embodiments. It is possible to prevent loosening of the wedge by absorbing the dimensional shrinkage due to aging deterioration of various insulating materials inserted in the slot by the reaction force.

In each of the above-described embodiments, the heat insulating members 4a and 4b are mounted and slid on the portion where the rotational centrifugal force of the rotor winding acts, that is, between the wedge 21 and the winding 3 of the slot outer diameter portion. Although the structure is adopted, if a sliding structure similar to the above is adopted in other places, thermal stress acting between the conductor of the winding and the winding insulating material can be further relaxed.

For example, as described above, when the operation is stopped, the rotational centrifugal force is smaller than the above-mentioned rotational centrifugal force, but due to the pressing force of the wedge 21, not only between the wedge 21 and the winding 3, but also between the bottom of the slot and the winding. When the windings are two layers above and below, the surface pressure is applied between the windings (the same applies to the stator windings),
The above-mentioned sliding structure may be adopted in these places as necessary.

FIG. 5 shows an example (fourth embodiment).

In the present embodiment, as shown in the drawing, in addition to the space between the wedge 21 and the winding 3 (enlarged view of the portion A), a pair of heat insulating members 4c made of the same material are also provided in the middle of the upper and lower windings. 4d and sliding members 5c and 5d are used for the sliding structure.

The sliding structure between the windings is composed of a pair of heat insulating members 4.
c and 4d are respectively adhered on the insulating material 3b of the upper and lower windings 3 by the adhesive 6 and arranged face to face, and the friction coefficient is also provided between the heat insulating members 4c and 4d between the two windings. The small sliding members 5c and 5d are interposed.

According to this embodiment, the binding force of the winding wire in the slot can be more effectively relaxed. In particular,
Immediately after the electric motor is stopped from the operating state, the centrifugal force becomes zero, but the winding 21 is pressed downward (in the inner diameter direction) by the restraining force of the wedge 21 inside the slot. On the other hand, the winding 3 is in the shrinking process due to the temperature drop of the conductor, and at this time, the sliding structure attached to the lower portion of the winding (for example, between the windings) does not restrain the winding insulating surface inside the slot. Can be shrunk.

Although not shown in FIG. 5, between the slot bottom and the winding, a fixed side heat insulating member is arranged on the slot bottom side, and a movable side heat insulating member bonded to an insulating material is arranged on the winding side so as to face each other. However, a sliding member having a small friction coefficient may be interposed between these heat insulating members.

FIG. 6 shows a fifth embodiment. This embodiment shows an application of the above-mentioned winding sliding structure to the rotor winding end portion.

Generally, in the winding type rotor, the winding end portions 22a, 22b protruding outside the slots of the rotor core are prevented from being deformed by centrifugal force, so that the bindings 23a, 23b are formed.
It is firmly fixed to the end ring 26 by the above. Therefore, as in the slot, on the insulating surface of the winding end,
High surface pressure is applied. On the other hand, since the winding wire slides in the slot and extends in the axial direction, it is necessary to provide a sliding structure at the winding end portion coming out of the slot to release the heat expansion amount. Therefore, the following structure is applied as an application of the first embodiment.

The movable heat insulating member 40 (FRP made of glass base material) is adhered to the winding end side to the winding insulation bottom surface with the adhesive 41 as in the first embodiment. Sliding members 45a, 45 having a small friction coefficient between the heat insulating member 40 and the end ring 26.
b is interposed.

As the sliding members 45a and 45b, for example, aramid paper is used, and the aramid paper 45a is attached to the inner diameter surface of the movable heat insulating member 40. The aramid paper 25b on the fixed side is adhered to the outermost layer of insulation provided on the end ring 26 over the entire circumference.

Each of the aramid papers 25a and 25b is coated with an ethylene tetrafluoride paint or silicone oil as a lubricating paint. With this structure, the winding end can be slid at the winding end without constraining the winding insulating surface even under high surface pressure, and the reliability of the winding insulation can be further improved. it can.

Although the above embodiments have been described by taking the rotor side winding as an example, the present invention can also be applied to the stator side winding.

One example (sixth embodiment) is shown in FIG.

The embodiment shown in FIG. 7 is applied to a rotary electric machine in which the stator winding 3'is arranged in the slots 31 of the stator core 30 in the upper and lower two layers. 3 '
In addition to interposing a pair of fixed-side heat insulating member 4b, movable-side heat insulating member 4a, and sliding members 5a and 5b between them, the heat insulating member 4 having a sliding structure similar to the above also on the slot bottom / winding 3 '.
a, 4b and sliding members 5a, 5b are provided, and further, heat insulating members 4c, 4d and sliding members 5c, 5d similar to FIG. 5 are provided between the windings 3 ', 3'.

Also in this embodiment, even if a high surface pressure is applied to the stator winding in the slot by the wedge, the heat expansion and contraction due to the heat generation change of the winding is smoothed to ensure the soundness of the winding insulation. Can be held.

[0062]

According to the winding sliding structure with the heat insulating member according to the present invention, the heat generation of the winding of the rotating electric machine is suppressed from being transmitted to the sliding member, and as a result, the thermal movement of the sliding member is suppressed. The effect (phenomenon in which the coefficient of friction increases) is reduced to always ensure good winding slidability, and to prevent thermal expansion of the conductor without restraining the winding insulating surface under high surface pressure. The winding insulation can follow and slide smoothly in the axial direction, and the thermal stress in the shearing direction generated between the winding insulation and the conductor can be relieved to improve the reliability of the winding insulation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part in a rotor winding slot of a rotary electric machine according to a first embodiment of the present invention and an enlarged cross-sectional view of part A.

[Fig.2] Temperature coefficient of friction coefficient of lubricating paint

FIG. 3 is a sectional view of an essential part in a rotor winding slot of a rotating electric machine according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part in a rotor winding slot of a rotary electric machine according to a third embodiment of the present invention and an enlarged cross-sectional view of part A.

FIG. 5 is a sectional view of an essential part in a rotor winding slot of a rotating electric machine according to a fourth embodiment of the present invention, an enlarged sectional view of an A section, and an enlarged sectional view of a B section.

FIG. 6 is a sectional view of a main part of a winding end portion according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view of an essential part in a rotor winding slot of a rotating electric machine according to a sixth embodiment of the present invention.

FIG. 8 is a sectional view of the inside of a slot of a conventional wire-wound rotor.

[Explanation of symbols]

3 ... Rotor winding, 3a ... Conductor, 3b ... Winding insulating material, 3 '
... Stator winding, 3a '... Conductor, 3b' ... Winding insulating material, 4
a ... movable heat insulating member, 4b ... fixed heat insulating member, 4c, 4
d ... Movable side heat insulating member, 5a, 5b ... Sliding member, 6 ... Adhesive agent, 7a ... Movable side slot liner, 7b ... Fixed side slot liner, 8a, 8b ... Elastic sliding member, 21 ... Wedge,
22a, 22b ... Winding end part, 23a, 23b ... Bind, 26 ... End ring, 40 ... Heat insulating member, 41 ... Adhesive agent, 45a, 45b ... Sliding member.

Claims (9)

[Claims] 1. A winding, in which a conductor is surrounded by an insulating material, is inserted into a slot arranged in a circumferential direction of a core of a rotating electric machine, and a wedge is attached to an upper portion of the slot to insert the winding in the slot. In a rotating electric machine with fixed windings, a pair of heat insulating members are arranged in a position where a high surface pressure is applied on the winding insulating material in the slot so as to face each other in the direction in which the surface pressure is applied. The movable side that adheres to the winding insulation material and moves in the axial direction following the contraction due to the thermal expansion and temperature drop of the winding is the movable side, and the other side is fixed to the core to be the fixed side. A rotary electric machine comprising a sliding member having a small friction coefficient interposed between the members. 2. The rotating electric machine according to claim 1, wherein the pair of heat insulating members and a sliding member interposed therebetween are provided in one or both slots of the rotor core and the stator core. 3. The rotation according to claim 1, wherein the pair of heat insulating members and a sliding member interposed therebetween are provided at least between the wedge and the winding in the slot. Electric machinery. 4. The pair of heat insulating members and the sliding member interposed therebetween are provided between the wedge and the winding, and between the winding and the bottom of the slot, respectively. A rotating electric machine characterized by the above. 5. The winding according to any one of claims 1 to 4, wherein upper and lower two layers of windings are inserted into the slot,
The pair of heat insulating members and the sliding member interposed therebetween are
Provided between the wedge and the winding, and between the winding and the bottom of the slot, and between the upper and lower two layers of the winding, a pair of heat insulating members are adhered on the insulating material of the upper and lower layers, respectively. A rotary electric machine characterized in that a sliding member having a small friction coefficient is interposed between the heat insulating members between the two layers of windings. 6. The winding end portion protruding from the slot of the rotor core is fixed on the end ring by binding according to any one of claims 1 to 5.
A heat-insulating member bonded to the winding end is interposed between the winding end and the end ring, and a sliding member having a small friction coefficient is interposed between the heat insulating member and the end ring. Electric machinery. 7. The slot wall surface and the slot wall surface are opposed to each other in a slot in which the pair of heat insulating members and a sliding member interposed therebetween are provided. A pair of slot liners is provided between the winding and one of the slot liners, and one of the slot liners is movably adhered to the insulating material of the winding while following the thermal expansion of the winding, and the other slot liner. A rotating electric machine, wherein a liner is fixed to the inner wall of the slot. 8. The heat insulating member according to any one of claims 1 to 7, wherein the heat insulating member is made of glass-based FRP, and the sliding member has a surface made of tetrafluoroethylene paint or silicon oil. A rotating electric machine characterized in that it is made of aramid paper coated with a lubricating material. 9. The rotary electric machine according to claim 1, wherein the sliding member has elasticity.