JPS58116042A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To uniformly suppress the temperature rise of a rotor coil by projecting a primary plate into a ventilating groove, thereby controlling the projecting amount and varying the inlet shape of the ventilating hole and substantially uniformly discharging the diffused amount from ventilating holes. CONSTITUTION:A rotor coil 12, a metal wedge 14, a primary plate 17 and a slot insulator 11 are contained in a coil groove 10 formed on the periphery of a rotational shaft 3. A radial ventilating hole 18 which connects a gas cap 9 between the shaft 3 and a stator core 6 to a ventilating groove 16 is formed at them. The plate 17 is stepwisely increased in thickness toward the axial center into the groove 16, thereby forming a projection 19. A primary plate part 17a having a ventilating hole 18 which communicates with an air supply section 9b largely varies the discharge amount from a primary plate part 17b having a ventilating hole 18 which communicates with an exhaust section 9c, and an oblique surface is formed at the inlet 21 of the hole 18 which communicates with the air supply section 9b.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a rotating electric machine in which (2) a plate of a circle wis is uniformly cooled in the axial direction.

Technical background of the invention In a large-capacity one-turn electric machine, 1g1 trochanter #IfliA
Although various proposals have been made to provide direct cooling by providing a LIliI in the This is an attempt to improve the radial ventilation system used in cylindrical rotors of rotating electric machines.

The conventional radial ventilation system is shown in Fig. 8 of 51M1 and 2-. The brackets (2) attached to both ends of the stator frame (1) are connected to a rotating shaft (3) that rotates the bracket (2) by
). Create a suitable ventilation path @@C1
The stator core (6) is stacked in a cylindrical shape on the stator frame (1) in which the duct (7) is placed at a predetermined interval in the axial direction.
) is provided. The gas inside the IE machine is emitted by fans (8) K provided at both ends of the rotating shaft (3) and is circulated through a plurality of parallel circuits as shown by the arrows. A part of the gas sent from the fan (8) is distributed to the air supply chamber (lb) formed by the stator frame (1) K at the outer periphery of the stator core (6) through ventilation holes (not shown). The duct inside the core (force passes through the central part K11i, passes through the gas gap (9) between the first cap (3) and the stator core (6), and connects to the duct inside the core (7) leading to the adjacent exhaust chamber (Ic). Atrium in the direction of the outer circumference, cooler (5
) and return to the fan (8). Also, some gas is blown from both ends of the gas gap (9) and passes through the duct (7) to the exhaust chamber (Ic) K5! It will be done. In the first trochanter, 1g
SP to multiple coils #- provided in one direction at 14kIfl on 1 rotation axis (3)! At the 4th residence ◆-uIo metal night I to prevent escape and 6! It is housed in a cleavage block for insulating u4 and winding uJ. Further, at the bottom of the coil #Q1, a ventilation hole #- is provided with a uniform cross section in the axial direction.

In order to prevent the slot insulation gJugo from falling into this ventilation #-, a band-shaped v*&aη made of an insulating material is provided. These tg1 trochanteric volume 1iiua and loquat U
+1 JIL holes u barrels in the radial direction communicating with the ventilation #- and the gas gap (9) are bored at predetermined intervals in the axial direction in the υ, IIJ, an, an, V*a*, etc. Therefore, the gas sent from the fan (8) at the inner end is a ventilation lI
Enters the μ pass, is distributed to the ventilation hole, and rotates pre-winding jiIQ'
! It blows through the gas gap (9) while cooling J, leaving behind the # formation duct (7) of the stator core (6), and flows into the cooler (!9).

BACKGROUND TECHNOLOGY In this case, the area wR of the ventilation groove is a constant size, and this ventilation groove has a large number of ventilation holes U barrels in the axial direction.
The air flow inside the ventilation Sα is small at the center of the shaft, and is made very large at the end of the shaft because it corresponds to the flow rate of the 1,000-diameter air hole leading to ventilation #4. The size of the axis of the kancho-tai 14Ii111! ! ! When the 4th door tSO wind speed becomes very large, the dynamic pressure in the axial direction increases, and the area around the shaft end side becomes Since the static pressure of the radial ventilation hole Ql becomes smaller, the blowing force in this part becomes weaker than in other parts. Moreover, if the shaft length is too long, the blowing force of the radial ventilation hole 01 around the center of the shaft will be reduced due to windage loss in the ventilation groove 11. Furthermore, the stator also has a cooling passage, which passes through the gas gap (9) between the rotor and the stator core. Ki section (
sb) and the exhaust section (9c) of the gas gap communicating with the exhaust chamber (Ic), different pressures are applied to the outer peripheral surface of the rotor.

In this way, since the rotor ventilation has different pressure distribution on the outer circumferential surface of the rotor, the air volume from the radial ventilation holes varies depending on each ventilation hole, and the rotor is uniform in the axial direction. It was difficult to cool down the temperature at the maximum point of m degrees with the conventional rotation 1 - O.Object of the InventionThe present invention provides uniform blowing force for each radial ventilation hole in one direction. It is an object of the present invention to provide a rotating electrical machine that increases the performance of the rotor and uniformizes the m degree rise in the axial direction of a cylindrical rotor.

In the present invention, a cylindrical rotor is rotated through a gas gap on the inner peripheral side of a cylindrical stator, and the gas gap is divided into an air supply section and a J# air section in the axial direction,
It has a coil trough that accommodates the one-trochanter winding in the axial direction of the rotor's one-turn axis, and a ventilation groove that is damaged by the coil #I, and has a In a rotor radial ventilation type rotating electric machine in which ventilation holes are provided in the radial direction at predetermined intervals in the axial direction, a belt-shaped lower part of the insulating structure of the rotating pre-winding is placed at the lower end of the trochanter winding Is. By increasing the amount of ventilation in the center of the bottom plate going to the central part, the bottom plate part with ventilation holes leading to the air supply section has a larger change in the amount of air coming out from the center than the bottom plate part having ventilation holes leading to the exhaust section. By adopting at least one of the following structures: or slanting the entrance of the ventilation hole leading to the air supply section so as to reduce the ventilation angle, the air outlet of each radial ventilation hole can be Measure to equalize the force.

Embodiments of the Invention Example 1 Hereinafter, embodiments of the jll of the present invention will be described with reference to Iris 3 to Iris 7. In addition, in these figures,
The same parts as in Figure JII1 and Figure UI1 & 2 are given the same reference numerals and their explanations will be omitted.

In this actual Jl1 example, the configuration of the underplate portion η is true as follows compared to the conventional fiK shown in Fig. jI1 and Fig. 2, and the others are 1lIIIl.

In other words, the conventional belt-shaped underlay plate (t7) has a constant thickness and width, and has a simple circular ventilation hole ttS, whereas the belt-shaped underlay plate αη of Honjitsu 1/IA1 #1 has a constant thickness and a constant width. A protruding portion μ is provided in the groove in #1 step shape with increasing thickness toward the center of the shaft. The underlay muη has a flange to prevent the ventilation grooves from getting stuck, and the shaft end side is very busy with the change in the stepped amount of the protrusion III from the shaft center side.
The lower plate 11 (17 m), which has a ventilation hole leading to the air supply section (9b), has a larger protrusion than the exhaust section, and has an inlet at the end of the ventilation hole leading to the air supply section (9b). Qυ is inclined in the direction (2) so that the ventilation bending angle is small. In addition, the central air supply section (
The inclined surface (2) is not provided at the entrance of the ventilation hole Ql of the lower plate part (17c) having the ventilation hole opening leading to the bottom plate (17c).

Next, the effect will be explained.

As mentioned above, by making the degree of change in the area where the protrusion Sμ of the underboard plate αD protrudes into the ventilation #uQ so that the 4th part of the shaft is larger than the central part of the shaft, the ventilation from one end *force) is increased. The wind that enters 111 has an increased resistance at the protrusion (1'J), the static pressure increases accordingly, and the blowing force toward the radial ventilation hole increases. Projection (1112
) By increasing t, the wind speed in #1@ can be made uniform. The α barrel in the ventilation 'K' is connected to the gas gap (9), and the pressure in the supply air section (9b) of the gas gap is slightly higher than that in the exhaust section (9C), and the pressure is increased by that much from the ventilation 'K (to). The blowing force will be suppressed, but the lower plate part (17a
) has a sudden increase in the amount of protrusion, and the opening is widened with an inclination direction (2) in the inflow direction of the ventilation hole Q camphor (21), so according to the former structure, According to the latter structure, the blowing force becomes stronger by scooping up the dynamic pressure in the axial direction, and by combining both, the blowing force of the α field of each ventilation hole is increased. It is approximated. In addition, the central air supply section (9
b) Underlayment 1j fllls (17
C) In the lower ventilation #I-, the wind flowing in from the ends of both wheels collides in the center, and all the dynamic pressure changes to static pressure, which becomes a blowing force to the ventilation hole a barrel. There is no need to provide the inclination direction (2) to the large ventilation entrance just by adjusting the amount of protrusion. Furthermore, even if a sloped box (2) is attached to the large ventilation inlet of the warmer S* in the bottom plate part (17C), the wind speed is much lower than that at the shaft end, so it is effective in scooping up dynamic pressure. It seems that there are also few.

Embodiment 2 Next, an embodiment of $2 will be described with reference to FIGS. 8-1 to 10. This is the bottom plate (t?) of the first embodiment.
) The step-like protruding portion ② is inclined to form a so-called sloped shape. Set the slope of the bottom plate W (17d) on the shaft end side to be the strongest, then set the bottom plate part (17a) of the air supply section.
) has a stronger negative slope. And the bottom plate part on the shaft end side (17
d) C) Inlet c11 of ventilation hole uls is provided with an inclined surface so that the ventilation bending angle is small. The rest is the same as the first embodiment.

By doing this, the overall ventilation will be better than if it were made in a step-like manner.
Since it has the advantage of reducing the axial ventilation resistance in the lltll, it is effective when it is necessary to send air to the center of the shaft of a machine with a long ventilation #μe, or when only a long ventilation groove is available. In this case, the bottom plate (17) on the shaft end side
Since the slope of d) is large, the slope l to the large ventilation entrance Qυ]
Providing li@ is effective in increasing the blowing force at that part. Other effects are the same as in the first embodiment.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but may include the following without changing the gist thereof:
Of course, it can be implemented with various modifications.

As described in detail, according to the present invention, the amount of air blown out of the ventilation holes can be adjusted by adjusting the amount of ventilation at the center of the underplate and changing the shape of the entrance of the ventilation holes. In other words, it is possible to uniformly suppress the increase in the -trochanter winding aloff by 1 degree. This makes it possible to bring the designed temperature rise limit and the practical average value of ff1 degree rise closer to each other, allowing a larger IEfIL to pass through, resulting in a compact rotating electric machine with good cooling efficiency.

[Brief explanation of drawings]

1m11m is a vertical cross-sectional view of the upper half of a conventional rotating electric machine, 3
12wA is an enlarged cross-sectional view along the It-I line in Figure 1,
Figure 7913 is a vertical view of the upper half of the rotating electrical machine showing an example of the practical example of Honryumei's rotating electric machine, and 11411 is an enlarged sectional view of the l1 part of Figure 3.
118 Figure 0V-VliilK enlarged cross-sectional view in the direction of arrows, No. 6
- is a diagonal J seen in the ``X'' arrow direction of the bottom plate of recommendation 4-! figure%
Figure lE7 is Figure 4. Enlarged section of ``Y'' section t7a111%gs
The figure is an enlarged sectional view of the main part showing another embodiment, and Figure 119 is the 8th embodiment.
The figure is a perspective view of the bottom plate seen from the direction of the arrow "2", and the JILO diagram is an enlarged sectional view of the "r" section in Figure 8. l... Stator frame 3... Rotating shaft 6... Fixed Child core 9...Gas gap 9b...Ii
9c...Exhaust section 10...Coil #112...Rotor winding 17...
・Underboard plates 17a, 17b, 17c, 17
d ・-Set plate part 18...Ventilation hole Takumi...
・Protruding part m...Entrance n...Inclination direction 1 person Patent attorney Inoue - Male Fig. 2 Fig. 5

Claims (2)

[Claims] (1) The cylindrical rotor is rotated once through a gas gap on the inner peripheral side of the cylindrical stator, and the gas gap is divided into an air supply section and an exhaust section in the axial direction, and The rotor 41i1 is housed in a coil body, and the coil #I has a ventilation hole drilled in the bottom of the coil #I. In a rotor radial ventilation type rotating electric machine that has ventilation holes that communicate with the -trochanter winding-OII! Among the edge components, the lower end of the rotating pre-winding is placed (the strip-shaped underlay plate is increased in the amount of protrusion into the root ventilation shaft going to the center, and the lower ** m has ventilation holes leading to the air supply section). Either increase the change in the amount of protrusion from the bottom plate that has the ventilation hole leading to the exhaust section, or make the entrance of the ventilation hole leading to the air supply section sloped so that the angle of ventilation becomes smaller. (Iktendenki is characterized by adopting the structure of one side. (2) The amount of protrusion of the TlIk plate changes stepwise.
3) The rotary electric fake according to item 1, characterized in that the amount of protrusion of the lower plate changes in a sloped manner.