JPH0514700Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Purpose of the invention] (Industrial application field) The invention aims at thinning by reducing the gap provided for insulation between the frame and the coil end of the stator coil. Regarding motors.

(Prior Art) For example, in a motor for an electric fan, a mounting device for supporting a fan guard is fixed to the front frame of the motor with a mounting screw, and a gear for swinging the fan is fixed to the rear frame of the motor. The case is fixed with mounting screws. Because these mounting screws are screwed through the frame, the tips of each mounting screw are closer to the coil ends of the stator coils than to the inner surface of the frame.

(Problem to be solved by the invention) By the way, the insulation distance between the stator coil, which is a live part, and the frame, oil pan case, or mounting screw, which is a non-live part, is the specified spatial distance specified by technical standards. The setting must take into account variations in the dimensional accuracy of the constituent parts, and once the necessary insulation distance is secured, the thickness of the motor is fixed, making it difficult to further reduce the thickness. Ta.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a motor that can reduce the spatial distance between a live part and a non-live part by simply adding a simple structure, and can be made thinner.

[Structure of the invention] (Means for solving the problem) The invention includes an oil receiver case made of an insulating material that receives lubricating oil from the bearing on the inner surface of a frame that holds a bearing for supporting the rotor shaft. By providing an insulating flanges by integrally molding a flanged portion interposed between the coil end of the stator coil and the inner surface of the frame to isolate them on this oil pan case. The space distance for insulation between live parts and non-live parts is reduced.

(Function) According to the above means, the spatial distance for insulation can be reduced, thereby making it possible to make the motor thinner.

(Example) An example of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a stator core around which a stator coil 2 is wound, which is fitted into a pair of motor frames 3, 3 made of sheet metal. motor frame 3,
3 is the rivet 4 with the flanges 3a and 3a together.
A cylindrical bearing support portion 5 is formed at the center of each end surface. This bearing support part 5
An oil-impregnated bearing 6 as a bearing is supported, and an oil core 7 made of felt, for example, impregnated with lubricating oil is disposed on the outer peripheral portion of the oil-impregnated bearing 6 so as to be in contact with the oil-impregnated bearing 6. Reference numeral 8 denotes an oil pan case formed into a cylindrical shape using an insulating material having insulation properties, oil resistance, and heat resistance, such as polycarbonate or polybutylene terectalate. The oil wick 7 is fixed to the inner side of the end surface of the motor frame 3 by passing through a hole 3b provided in the hole 3b and heating and crushing the through end thereof, and the oil wick 7 is housed in the oil receiving case 8. Reference numeral 9 denotes an annular elastic plate provided inside the stepped portion 8a of the oil pan case 8, and by pressing the inner peripheral edge of this plate against the outer peripheral surface of the oil-impregnated bearing 6,
The oil-impregnated bearing 6 is pressed against the bearing support portion 5. Reference numeral 10 denotes an annular flange-shaped part integrally formed on the outer periphery of the oil pan case 8, which is interposed between the inner end surface of the motor frame 3 and the coil end 2a of the stator coil 2 so as to isolate them. The coil end 2a of the stator coil 2 is arranged relatively close to the coil end 2a of the stator coil 2. Reference numeral 11 denotes a rotor, and both ends of a rotor shaft 12 of this rotor are rotatably supported by oil-impregnated bearings 6.

On the other hand, reference numeral 13 denotes a fixture fixed to one end surface of the motor frame 3 via a mounting screw 14, and a guard 16 of the electric fan is fixed to this via a nut 15. Further, reference numeral 17 denotes a support fixed to the other end surface of the motor frame 3 via a mounting screw 18, to which a swinging device for an electric fan, etc. is attached, although not shown.

According to the above configuration, since the flanged portion 10 is made of plastic and has an insulating property, if the thickness of the flanged portion 10 exceeds the specified value, the coil end of the stator coil 2, which is a live part, can be used. 2a and the mounting screws 14 and 18, which are the non-live parts closest to it.
The space distance d required for insulation between the motor frame 3 and the motor frame 3 can be set to the minimum dimension, and the dimension between both ends of the motor frame 3, that is, the thickness can be reduced, and the motor frame 3 can be made thinner.

In addition, since the brim portion 10 covers the coil end 2a, it is possible to easily secure the insulation distance even when it is difficult to shape the stator coil 2 or when random wires are likely to appear. Excellent manufacturability.

In the above configuration, the oil pan case 8 is attached to the motor frame 3 by heating and crushing the convex portion 8a, but it may be attached using general screws or the like.

[Effects of the invention] As is clear from the above explanation, the present invention has an oil pan case made of an insulating material, and a coil end of the stator coil that is a live part and an inner surface of the frame that is a non-live part. Since the flange-like part interposed to isolate the motor is integrally molded to reduce the space distance for insulation, the motor can be made thinner with a simple structure.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view of the whole, and FIG. 2 is a partially cutaway perspective view of the oil pan case. In the drawing, 1 is a stator core, 2 is a stator coil,
3 is a motor frame, 6 is an oil-impregnated bearing (bearing), 8 is
1 is an oil pan case, 10 is a flange, 11 is a rotor, 1
2 is a rotor shaft.

Claims (1)

[Scope of utility model registration request] A stator core around which a stator coil is wound, a frame that holds a bearing for supporting a rotor shaft and surrounds the coil end of the stator coil, and lubricating oil from the bearing on the inner surface of this frame. an insulating oil pan case provided to receive the oil pan, and a flange-like portion integrally molded with the oil pan case and interposed between the coil end of the stator coil and the inner surface of the frame so as to isolate them. A motor comprising: