JPS6359744A - Stator coil structure of generator for vehicle - Google Patents

Abstract

PURPOSE:To improve a cooling efficiency by forming a gap for cooling air to pass through between projecting coil groups of stator coils. CONSTITUTION:Stator coils 7 are provided so as to project respectively from both side faces of a stator core 6 towards a core shaft center direction. Out of projecting coil groups, outer three coil groups 7a project more than inner six coil groups 7b and said outer and inner coil groups 7a, 7b are separated from each other in a wiring structure of this apparatus so that a gap 11 exists between both coil groups 7a, 7b. In this case, said gaps 11 are positioned so as to be opposed to basic end positions of blades 12a of a cooling fan 12 respectively provided integrally with both side faces of a rotor core 3. Thus, a cooling efficiency of stator coil and other members is improved to obtain a high output.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stator coil structure for a vehicle generator installed in a vehicle such as a passenger car, bus, truck, or motorcycle.

[Prior art and problems to be solved by the invention] Recently,
This type of vehicle generator is required to have a higher output as its output tends to increase as the use of electric devices and electronic control devices in vehicles increases.

However, the current situation is that generators cannot be increased in size arbitrarily due to space limitations in which they can be installed, and there is even a demand for miniaturization. Therefore, improving the cooling efficiency of the generator is considered as a means of achieving higher output of the generator, and among these improvements, the improvement of the cooling efficiency of the stator coil, which generates a large amount of heat, is attracting attention. However, in the past, stator coils had a group of thick wires that protruded from the stator core in the same phase, so the surface area that was hit by the cooling air from the cooling fan installed on the side of the rotor core was small, and the cooling efficiency was extremely poor. Ta. Therefore, there are some models in which the protruding coil group of the stator coil is wired in a substantially straight line with the amount of protrusion changed in stages to increase the surface area and to provide a small gap between each coil.
In this case, the gaps between each coil are small, so when the stator coils are made rigid with an adhesive such as varnish, the gaps are closed, or even if they are, they become extremely small, and as a result, the cooling air However, since the coils are wired in a row, the cooling air flows around the protruding ends of the large protruding coil groups, causing the cooling air to be warped and disturbed, which hinders the improvement of cooling efficiency, which is a problem.

[Means for Solving the Problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a stator coil structure for a vehicle generator that can eliminate these drawbacks. In a vehicle generator in which a cooling fan is attached to a side surface of a rotor core and a stator coil is made to protrude from the side surface of the stator core, a group of protruding coils in the same phase of the stator coils is an outer coil group having a large protruding amount, It is divided into a small inner coil group, and a gap is formed between both coil groups,
The gap is characterized in that it is formed in a ventilation flow path for cooling air so as to face the cooling fan blade.

According to the present invention, with this configuration, gaps through which the cooling air passes can be actively formed between the protruding coil groups of the stator coils, thereby eliminating disturbances in the cooling air and improving cooling efficiency. This is what I did.

[Embodiment 1] Next, an embodiment of the present invention will be explained based on the drawings. In the drawing, 1 is a generator for a vehicle;
The rotor core 3 is press-fitted into the core shaft 2, the coil bobbin 4 is installed inside the rotor core 3, the rotor coil 5 is wound around the coil bobbin 4, the stator core 6, and the stator coil 7 (described below) is wound around the stator core 6. The construction of members such as a brush 9 that slides against the slip ring 8 in an elastic manner and a rectifier 10 that rectifies the generated alternating current are all conventional.

The stator core 6 has an annular shape, and a plurality of tooth portions 6a protrude from the inner circumferential side of the stator core 6 at predetermined intervals. Then, the stator coil 7 is wound in the groove formed between each of the adjacent teeth 6a (because it is a three-phase stator coil system, the coils of each phase are arranged so that the grooves are shifted from each other). However, in the embodiment, nine coils are wound for the same phase. The stator coils 7 protrude from both sides of the stator core 6 in the axial direction of the core shaft 2, and in this embodiment, the protruding coil groups are configured as follows. ing.

That is, in the above protruding coil group, nine coils of the same phase protrude toward the axial direction of the core shaft 2, but the amount of protrusion changes in stages.
The coils are wired so as to be parallel to each other in a substantially straight line at the protruding end portion. Further, among these coil groups, the outer three coil groups 7a have a larger protrusion amount than the inner six coil groups 7b, and the inner and outer coil groups 7a, 7
The wiring structure is such that a gap 11 (in the embodiment, a gap approximately equivalent to two coils) exists between the two coils.

On the other hand, reference numeral 12 denotes cooling fans that are integrally provided on both sides of the rotor core 3, and the blades 12a of the cooling fan 12 are formed to protrude in the axial direction of the core shaft. The gap 11 faces the base end of the blade 12a. The cooling air generated by the blades 12a as the rotor core 3 rotates.

The maximum air volume position is approximately at the gap 11, and the air is set to actively pass through the gap 11.

In the embodiment of the present invention configured as described above, alternating current is generated by the rotation of the rotor core 3 as the engine is driven, and this is rectified by the rectifier 10 and output to the outside. The stator coil 7 will be efficiently cooled by the cooling fan 12, and will greatly respond to the increase in the output of the generator 1.

That is, in the present invention, the coil groups protruding from the stator core 6 of the stator coil 7 are an outer coil group 7a with a large protrusion amount and an inner coil group 7b with a small protrusion amount, and both coil groups 7
A gap 11 is formed between a and 7b, and this gap faces the fan blade 12a and serves as an active ventilation flow path for cooling air. Therefore, the cooling air generated by the fan blades 12a is blown onto the inner surface of the stator coil 7 (the surface on the axis side of the rotor shaft). 11 is used as a ventilation flow path to actively blow through toward the outer surface of the stator coil 7, and even on the outer surface of the stator coil 7, the airflow from the fan blade 12a bypasses the protruding end of the stator coil 7. No direct cooling air flow path is formed. Therefore, the stator coil 7 is cooled extremely efficiently inside and outside.

In this way, in the present invention, the protruding coil group of the stator coil 7 is divided into inner and outer coil groups 7a and 7b having different protruding amounts, and a gap 11 is provided between them through which the cooling air from the fan blade 12a directly passes. This extremely simple configuration allows for an active cooling air flow path that passes between the protruding coil groups, and even if the stator coil 7 is made to protrude significantly from the stator coil 6, it will be possible to maintain a smooth flow with little disturbance. A flow of cooling air can be ensured, which improves the cooling efficiency of not only the stator coil 7 but also other members, making a significant contribution to higher output.

Furthermore, since both coil groups 7a and 7b have a wiring structure in which the protrusion amounts are changed in stages and are arranged in a substantially straight line, the surface area of the coil groups is expanded and even higher cooling efficiency can be ensured. In addition, the gap 11 formed between the coil groups 7a and 7b is substantially opposite to the base position of the fan blade 12a, and is at the position where the cooling air volume is approximately the maximum. A reliable and strong air path is secured, which further contributes to improving cooling efficiency. Furthermore, since the outer coil group 7a is not a single wire with only - wires but a plurality of three wires, the strength of the large protruding outer coil group a itself can be ensured.
This is convenient because it can prevent inadvertent deformation.

[Operations and Effects] In summary, 1. Since the present invention is configured as described above, the outer coil group and the inner coil group, which are divided by the difference in the amount of protrusion of the coil groups protruding from the stator core of the stator coil, The gap in the gap faces the cooling fan blade.

This is formed into a positive ventilation flow path for cooling air, through which the cooling air from the cooling fan passes directly. Therefore, it is possible to secure an active flow path for the cooling air that passes directly between the protruding coil groups.

Even if the stator coil is made to protrude greatly from the stator coil, it is possible to ensure a smooth flow of cooling air with little turbulence that passes over the stator coil, and of course the stator coil.

The cooling efficiency of other components will also improve, making a significant contribution to higher output.

[Brief explanation of drawings]

The drawings show an embodiment of the stator coil structure of a vehicle generator according to the present invention, in which FIG. 1 is a partially cutaway side view of the vehicle generator, and FIG. 2 is a partially cutaway side view of the vehicle generator. Front view,
FIG. 3 is a front view of the stator, FIG. 4 is a plan view of the protruding coil group, and FIG. 5 is a sectional view showing the relationship between the cooling fan and the protruding coil group. In the figure, 1 is a generator, 3 is a rotor core, 6 is a stator core, 7 is a stator coil, 7a is an outer coil group, 7b is an outer coil group, 11 is a gap, 12 is a cooling fan, and 12a is a blade thereof. Figure 3

Claims (1)

[Claims] 1) In a vehicle generator in which a cooling fan is attached to a side surface of a rotor core and a stator coil is made to protrude from the side surface of the stator core, the protruding coil group of the stator coils in the same phase is It is characterized in that it is divided into a large outer coil group and a small inner coil group, and a gap is formed between both coil groups, and the gap is formed as a cooling air ventilation flow path facing the cooling fan blade. Stator coil structure for a vehicle generator. 2) The stator coil structure of a vehicle generator according to claim 1, wherein the coils of each coil group are wired in a substantially straight line with the amount of protrusion thereof being changed stepwise. . 3) The outer coil group is composed of at least a plurality of coils, preferably approximately one-third of the total number of coils of the same phase, as claimed in claim 1. The stator coil structure of the vehicle generator described. 4) The stator coil structure for a vehicle generator according to claim 1, wherein the gap is located opposite to the base position of the cooling fan blade and located at a position where the cooling air volume is maximum.