JPH0521965Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to a ventilation cooling device for a rotating machine, which has a rotor, a commutator, and an armature core around which an armature coil is wound, and which cools the rotor with air. It is something. (Prior Art) In a rotating machine having an armature core in which a commutator and an armature coil are wound around the rotor, the main poles and commutative poles of the stator are usually fixed with gaps in the circumferential direction of the frame. Cooling air is introduced into the gap between these poles for cooling. Heat is also generated in the armature due to iron loss in the armature core and resistance of the armature coils, etc., so an axial duct extending in the axial direction of the rotor is installed, and if necessary, heat is generated in the armature core. Radial ducts extending in the circumferential direction are provided at every predetermined volume thickness, and the rotor is cooled by forcibly supplying outside air to these ducts using a blower (for example, Utility Model Application No. 59-90273, 59-
90274, 59-90275, etc.). (Problem to be solved by the present invention) However, the area of the axially long gap (hereinafter referred to as the pole gap passage) formed between the main and commutative poles of the stator is usually 3 times the area of the rotor's axial duct. It will be double. For this reason, when outside air (cooling air) is forcibly supplied into the rotating machine by a blower, the amount of cooling air flowing into the interpolar gap passage increases significantly, and the amount of cooling air entering the axial duct of the rotor decreases. In other words, an imbalance in the amount of cooling air occurs. For this reason, there was a problem that the rotor was insufficiently cooled. Furthermore, due to the relationship between the wind speed of the blower and the cooling effect, the cooling effect was generally saturated at a wind speed of around 25 m/s. (Purpose of the invention) The present invention was developed in view of the above circumstances, and aims to improve cooling efficiency by correcting the imbalance in the amount of cooling air flowing between the interpolar gap passage and the rotor axial duct. The purpose of the present invention is to provide a ventilation cooling device for a rotating machine. (Means for Solving the Problems) According to the present invention, the purpose is to provide a fixing device having a substantially cylindrical frame and a plurality of poles fixed to the inner peripheral surface of the frame with gaps in the circumferential direction. a bracket fixed to both ends of the frame;
The bracket includes a rotor having an axially long axial duct formed in an armature core fixed to a rotary shaft rotatably held by the bracket, and the cooling air supplied from one end of the frame is directed to the stator. In a rotating machine with a commutator that is guided to a gap passage between the poles and an axial duct of the rotor for cooling, a substantially annular ventilation regulating plate in which a ventilation regulating window is formed is connected to the gap between the poles. This is achieved by a ventilation cooling device for a rotating machine, which is fixed to the frame so as to be close to one end of the cooling air inflow side of the passage. That is, by appropriately determining the area and position of the windows provided in the ventilation adjustment plate, the imbalance between the amount of cooling air flowing into the stator gap passage and the amount of cooling air flowing into the rotor axial duct is corrected. (Embodiment) FIG. 1 is a side sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line -1. In these figures, reference numeral 10 is a rotating shaft, 12 is an armature core fixed to the rotating shaft 10, 14 and 16 are end plates that press the armature core 12 from both end faces, 18 is an armature coil, and 20
is a commutator, and the rotor is composed of these. An axial duct 22 is formed through the armature core 12 and the end plates 14 and 16 in the axial direction. Further, in this embodiment, a plurality of radial ducts 24 are formed in the armature core 12 in the radial direction, and the inside of the radial duct 24 opens into the axial duct 22, and the outside opens into the outer peripheral surface of the armature core 12. ing. The commutator 20 includes a support tube 26 supported by a plurality of ribs 25 (see FIG. 2) on the rotating shaft 10, and a large number of commutator pieces 28 fixed to the outer peripheral surface of the support tube 26. A lead 29 containing the armature coil 18 is fixed to the child piece 28, and a bind wire 29a is wound around the outer periphery of the lead 29. Each commutator piece 28 is connected to the armature coil 18.
It is connected to the. The stator includes four main poles 32 and four commutating poles 34 alternately fixed to a frame 30, and each of the main poles 32 and commutating poles 34 has a coil 36,
38 is wrapped around it. A long gap is formed in the axial direction between the main pole 32 and the complementary pole 34,
This gap serves as an interpolar gap passage 40. Note that 42 in FIG. 1 is the lead wire of the coils 36 and 38. 44 is a bracket, which connects the rotating shaft 10 to 2.
It is supported by two bearings 46 (only one is shown). This bracket 44 is fixed to the frame 30. In FIG. 1, reference numeral 47 denotes a brush holder fixed to the case 44, which holds a brush (not shown) that comes into sliding contact with the commutator piece 28. A cooling air inlet 48 is opened in this bracket 44 . Reference numeral 50 denotes an annular ventilation adjustment plate, the outer edge of which is fixed to the end surface of the frame 30 near the inlet 48. The inner circumferential edge of the ventilation adjustment plate 50 includes a lead 29 extending in the radial direction connecting the commutator piece 28 and the armature coil 18, and the brush holder 4.
7. The ventilation adjustment plate 50 has a second
As shown in the figure, ventilation adjustment windows 52 and 54 are formed at opposing positions approximately at the center of the coils 36 and 38 of the main pole 32 and the commutative pole 34 of the stator. Therefore, when outside air is supplied from the inlet 48 by a blower (not shown), part of this outside air, that is, the cooling air, passes between the brush holders 47 and between the ribs 25 and enters the axial duct 22, and the other part passes through the axial duct 22. It enters the axial duct 22 through between the brush holders 47 and between the leads 29. This axial duct 22
A part of the cooling air that has entered is guided between the rotor and the stator by the radial duct 24, and the rest is exhausted from the other end of the axial duct 22. Inflow port 48
The remainder of the cooling air that has entered the window 5 of the ventilation adjustment plate 50
2 and 54, enters the stator gap passage 40 while cooling the coils 36 and 38, and is discharged from the other end. The cooling air that has entered the inlet 48 is divided so that one part cools the rotor and the other cools the stator.
This can be adjusted by changing the area and position of the windows 52, 54. For example, with other conditions being the same, the rating is 846 HP - 1046 rpm - 750 V / with the ventilation adjustment plate 50 removed and with it installed in this embodiment.
Comparing the temperature rise of each coil of a 900A DC motor, the results are as follows. In this case, the ventilation area ratio between the rotor side and the stator side without the ventilation adjustment plate is
75% vs. 25%, 50% vs. 50% with ventilation adjustment plate
It was hot.

[Table] As described above, the temperature of the coils 36 and 38 on the stator side increases slightly, but the temperature of the coil 18 on the rotor side decreases significantly. Generally, coil 1 on the rotor side
Since the coil 18 has a higher temperature than the stator side coils 36 and 38, by significantly lowering the temperature of the coil 18, the insulating material blade can be lowered, which also contributes to a significant cost reduction. In the above embodiment, the windows 52 and 5 of the ventilation adjustment plate 50
Although the area and position of the window 4 are constant, the fixed angle of the plate 50 may be made adjustable so that the relative position between the window and the coils 36, 38 can be changed. Alternatively, the ventilation adjustment plate 50 may be constructed of two plates, and the area of the window may be changed by relatively changing the fixed angles of the two plates. Also, install shielding boards near the windows.
The area of this thin plate may be changed. (Effect of the invention) As described above, in the present invention, since the ventilation adjustment plate is fixed to the frame so as to be located close to the cooling air inlet side of the interpolar gap passage of the stator, By changing the area and position of the ventilation adjustment window, the distribution of cooling air between the stator side and the rotor side can be adjusted. Therefore, it becomes possible to sufficiently increase the amount of cooling air on the rotor side and significantly improve the overall cooling efficiency. Therefore, the life of the rotating machine can be extended and the output can be increased. Also,
Since it is also possible to make the rotor smaller, it is possible to reduce the size and weight, which has great industrial effects.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line -2. 10... Rotating shaft, 12... Armature core, 22...
...Axial duct, 30...Frame, 32...
...main pole, 34...complementary pole, 40...interpolar gap passage,
48... Cooling air inlet, 50... Ventilation adjustment plate, 5
2,54...Ventilation adjustment window.

Claims (1)

[Claims for Utility Model Registration] A substantially cylindrical frame, a stator having a plurality of poles fixed to the inner peripheral surface of the frame with gaps in the circumferential direction, and a stator fixed to both ends of the frame. The rotor is equipped with a rotor having an axially long axial duct formed in an armature core fixed to a rotary shaft rotatably held by the bracket, and the cooling air supplied from one end of the frame is provided. , in a rotating machine with a commutator that is guided to a gap passage between poles of the stator and an axial duct of the rotor for cooling; A ventilation cooling device for a rotating machine, characterized in that the ventilation cooling device is fixed to the frame so as to be close to one end on the cooling air inflow side of the gap passage between the poles.