JP4886815B2 - Rectifier for rotating electrical machine and fixing method of rectifier element - Google Patents

Description

  The present invention relates to a rectifier that converts alternating current generated in a rotating electrical machine such as an automotive alternator into direct current, and a method of fixing a rectifier element in the rectifier.

In a conventional rectifier for an AC generator for a vehicle, a rectifying element is fixed to a side surface of an arc-shaped fin base (cooling member) by soldering (for example, Patent Document 1).
A semi-arc-shaped fin base is arranged in a double ring shape, and a large number of cooling fins extending in the radial direction are provided on the inner peripheral surface of the inner ring and the outer peripheral surface of the outer ring, respectively. Is disclosed (for example, Patent Document 2).
With such a configuration, it is possible to increase the fin area in the vehicular generator having a circular cross section without increasing the outer shape of the vehicular generator, and as a result, it is possible to cope with an increasing current output. Are listed.

Japanese Patent Laying-Open No. 2006-262644 (5th page, FIG. 4) Japanese Patent No. 2669534 (page 3, FIG. 2)

The configuration described in Patent Document 2 shows a configuration that allows an increase in fin area, but there is no description of details of a rectifying element (diode) that is supposed to be provided on the circumferential side surface of the semicircular arc fin base. The fixing method is not described.
For example, it is apparent that the following problems occur when an actual product is obtained by applying soldering well known in Patent Document 1 to the configuration of Patent Document 2.
Patent Document 2 Fig. 2 Configuration:
It is not only necessary for the fin tip surface or fixed end surface to be able to support stably during mounting work, but the fin base surface (diode support surface) must be kept horizontal during work in order to hold molten solder. It is necessary to. For each diode to be mounted, the process of making the fin-based diode fixing surface horizontal must be repeated.
The same applies to the case where the diode is press-fitted into the fin base as another mounting method. The work of supporting the diode-fixing surface of the fin base in a horizontal state is also required from the press-fitting with a load. .
In other words, when configured with a semi-arc-shaped fin base (Patent Document 2), in actuality, such as the cooling fin tip processing and deletion of the rear surface of the part at the time of mounting the diode, the arrangement work process to be performed individually, etc. Manufacturability was extremely poor, and mass production was considered difficult.

In order to solve the above-described problems, in the present invention, a plurality of fins are extended from an arcuate body portion of a cooling member configured to be elastically deformable , and a fixing groove portion that fixes a rectifying element to the arcuate body portion The rectifying element and the cooling member are integrated by a configuration in which the fixed groove portion is deformed in the extending direction and an element is disposed in the fixed groove portion and then the deformation is released.

According to the present invention, a plurality of rectifying elements that have been difficult can be arranged on the circumferential side surface, and the rectifying device is efficiently arranged without excess space mainly in a cylindrical rotary electric device. In addition to being able to do so, a plurality of rectifying elements can be simultaneously arranged on the arcuate peripheral side. As a result, the rotating electrical machine can be reduced in size, and material costs and manufacturing costs can be reduced.
In addition, the cooling fins arranged directly under the rectifying element fixing part can be arranged so that the cooling fluid passes through the fins and goes to the shaft end so as to face the axis of the cylindrical rotating electric device. The cooling effect by the axial cooling fluid in the electrical equipment is improved, and there is an effect that the reliability of the rectifier increases and the life of the rectifier extends.

It is principal part sectional drawing of the alternating current generator for vehicles to which this invention is applied. It is a top view explaining the assembly state of the radiation fin in the rectifier of the alternating current generator for vehicles which concerns on Embodiment 1 of this invention. It is a top view explaining the assembly state of the radiation fin in the rectifier of the alternating current generator for vehicles which concerns on Embodiment 2 of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view of an essential part of an automotive alternator to which the present invention is applied, and FIG. 2 is a plan view schematically showing an example of a method of fixing a rectifying element to the cooling member.

  First, the overall structure of the vehicle alternator will be described with reference to FIG. A rotor 3 is arranged in a casing 2 that surrounds and supports the components inside. On the outer periphery of the rotor 3, the stator 4 is disposed with a small distance from the claw-shaped magnetic poles of the pair of pole cores 31 and 32. Further, the shaft 33 provided in the rotor 3 is provided with a pulley, and the belt (Not shown) is configured to be rotationally driven. Further, a field winding 34 for exciting both pole cores to different magnetic poles is mounted inside the pole cores 31 and 32, and a cooling fan 35 as a cooling means is attached to the outside of the pole cores 31 and 32. Yes.

  Further, a slip ring 5 is provided at one end of the shaft 33, and is electrically connected to the field winding 34, and current is supplied from the outside through the slip ring 5 and a brush (not shown). It is like that. Further, as a component supported by the casing 2, rectification is performed to rectify an alternating electromotive force generated in the winding 41 of the stator 4 by a rotating magnetic field generated when a current is supplied to the field winding 34 and rotationally driven. A device 6 and a voltage regulator (not shown) for limiting the generated power to a specified value are arranged.

  Next, the rectifier 6 will be described. The positive side cooling member 61 is disposed with the fins 63 protruding in the inner circumferential direction, and the negative side cooling member 71 is disposed with the fins 73 protruding in the outer peripheral direction. A positive electrode side rectifying element 65 and a negative electrode side rectifying element 75 are arranged. A plurality of fins 63 and 73 are provided adjacent to each other along the flow of cooling air generated by the cooling fan 35 so as to increase the cooling efficiency. A terminal block 8 that electrically connects the lead terminals of the plurality of positive-side rectifying elements 65 and negative-side rectifying elements 75 and the leads 42 of the stator winding 41 is disposed between the rectifying device 6 and the stator 4. Has been.

The structure of the cooling member provided with the rectifying element and the heat radiating fin will be described with reference to FIG.
The positive-side cooling member 61 has a base portion 62 having a substantially arc shape, and a plurality of fins 63 extending toward the central axis are provided on the side surface facing the central axis side, and the base portion fins 63 are provided. A plurality of fixed groove portions 64 are formed on the side.

FIG. 2 is a diagram illustrating a method of fixing the rectifying element to the cooling member.
The positive-side cooling member 61 has a semicircular arc shape in the base portion 62 in order to secure a fin area, and a large number of cooling fins 63 are formed in the radial direction so as not to hinder axial wind flow. In order to attach the positive-side rectifying element 65 to the back surface of the cooling member base portion 62 facing the fins 63, a fixed groove portion 64 having a taper that becomes wider toward the back is provided (FIG. 2A).
The opening width of the fixed groove portion 64 is determined to be smaller than the base 66 width of the rectifying element 65.

  First, in order to insert the base of the rectifying element 65 into the fixed groove portion 64, a load is applied to the tip of the cooling member 61 in the inner diameter direction as shown in FIG. The rectifying element base 66 is disposed in the fixed groove portion 64 with the opening width of 64 wider than the rectifying element 65 base width (FIG. 2C). The insertion direction at this time can be either radial or axial.

  Next, with the rectifying element base 66 disposed in the fixed groove portion 64, by removing the load applied to the cooling member 61, the opening width of the fixed groove portion 64 is close to the initial state (FIG. 2A). The rectifying element base 66 is fixed by the fixing groove portion 64, and the cooling member 61 including the cooling fins 63 and the rectifying element 65 are integrated.

  Since the rectifying element base 66 only needs to be fixed to the cooling member 61, the internal dimension A before the rectifying element 65 is attached (FIG. 2A) and the state after the rectifying element 65 is attached (FIG. 2). The inner dimension B of (d)) does not have to be exactly the same dimension, and the size can be increased or decreased within a range that does not hinder the incorporation as a rectifier in a vehicle AC generator. Actually, by providing the dimension A slightly larger than the dimension B, it is possible to obtain a configuration that takes into account the deformation of the cooling member base part 62 after the rectifying element base 66 is inserted.

  In the description of FIG. 2, the arc-shaped arrow 67 and the linear arrow 68 are shown around the tip as an example of the load on the cooling member base, but the present invention is not limited to this, and the desired degree of deformation and the cooling member Examples of loads that take into account the base shape can be selected as appropriate. In some cases, a load may be applied while holding a portion other than the fixed groove portion 64 of the rectifying element 65 with a jig (not shown). In this way, the working time increases, but it is possible to reliably attach each individual rectifying element.

Further, in the above description, the fixing groove 64 for fixing is tapered so that the depth is wide, and the rectifying element base 66 is similarly tapered so as to match it. Even those configured in a tapered shape are applicable.
Embodiment 2. FIG.

  FIG. 3 is a view for explaining a method of fixing the negative electrode side rectifying element 75 to the negative electrode side cooling member 71. The difference from FIG. 2 is that the fin 73 is arranged on the outer diameter side and the fixed groove 74 is arranged on the inner diameter side, and the load (arc-shaped arrow) is applied to the distal end of the cooling member base 72 in the outer diameter direction as shown in FIG. 77 and the linear arrow 78) are applied and elastically deformed to widen the opening width of the fixed groove 74 from the rectifying element base width 76. Others are the same as the case of FIG. Regarding the dimensions of the cooling member before and after the rectifying element base 76 is inserted into the fixed groove 74, the inner dimension C before insertion (FIG. 3A) is slightly smaller than the inner dimension D after insertion (FIG. 3D). It is better to make it smaller.

Note that both the first and second embodiments can be applied to cylindrical rectifying elements and other elements by changing the shape of the fixing groove.
Moreover, it is a structure which selects suitably whether the fin protruded from a cooling member base part is an internal-diameter direction or an outer-diameter direction, and it cannot be overemphasized that any may be sufficient as the positive electrode side negative electrode side.

  2 casing, 3 rotor, 4 stator, 5 slip ring, 6 rectifier, 8 terminal block, 31, 32 pole core, 33 shaft, 34 field winding, 35 cooling fan, 41 stator winding 42 lead wire, 61 Positive side cooling member, 62 Cooling member base part, 63 Fin, 64 Fixed groove part, 65 Positive side rectifying element, 66 Rectifying element base, 71 Negative side cooling member, 72 Cooling member base part, 73 Fin, 74 Fixed groove part, 75 Negative side rectifier, 76 Rectifier base.

Claims (4)

Casing that houses or supports components, Rotor rotatably supported by the casing, Cooling means provided in the rotor, Stator positioned on the outer periphery of the rotor and sandwiched by the casing, Stator And a rectifier that rectifies AC electromotive force generated in the stator winding into a direct current. The rectifier includes a plurality of rectifier elements and a cooling member that cools the rectifier elements. In the rotating electrical machine, the cooling member is configured to be elastically deformable, and includes a plurality of fins extending in a substantially radial direction from the substantially arcuate body portion, and a fixing groove portion for fixing the rectifying element to the arcuate body portion. after placing the element and the by deforming the arcuate body portion in a direction to extend the fixed groove in the fixing groove, the configuration solving deformation, to secure the rectifying element to the fixed groove Ri rectifier of the rotating electrical machine, characterized in that so as to integrate the cooling member and the rectifying element. Casing that houses or supports components, Rotor rotatably supported by the casing, Cooling means provided in the rotor, Stator positioned on the outer periphery of the rotor and sandwiched by the casing, Stator stator windings provided in, and a rectifier for rectifying an AC electromotive force generated in the stator windings into direct current, the rectifier device have a cooling member for cooling the plurality of rectifying elements, a rectifier element The cooling member is configured to be elastically deformable, and a plurality of fins extend in a substantially radial direction from the substantially arc-shaped main body portion, and a rotation is provided with a fixing groove portion that fixes the rectifying element to the arc-shaped main body portion. integrated in electrical machine, after said arcuate body portion direction is elastically deformed to extend the fixed groove by applying a load to place the device in the fixed groove, by solving the deformation, the cooling member and the rectifying device Fixing method of the rectifying element in the rectifier of the rotating electrical machine, characterized in that the so that. Casing that houses or supports components, Rotor rotatably supported by the casing, Cooling means provided in the rotor, Stator positioned on the outer periphery of the rotor and sandwiched by the casing, Stator And a rectifier that rectifies an AC electromotive force generated in the stator winding into a direct current. The rectifier includes a positive rectifier element, a negative rectifier element, and the positive rectifier element. the positive electrode side cooling member for cooling the mounting rectifying element, the electric rotating machine having an anode side cooling member for cooling the rectifying element attached to the negative electrode side rectifying elements, one of said cooling member is configured to be elastically deformable, substantially circular a plurality of fins protruding extends out inwardly substantially radially from the arcuate body portion, those with fixed grooves formed on the outer periphery of the arcuate body portion for fixing the rectifying element There, the other cooling member is configured to be elastically deformable, a plurality of fins generally radially from a substantially arcuate body portion with projecting extending out outwardly, is formed on the inner periphery of the arcuate body portion wherein A fixed groove portion for fixing the rectifying element is provided, and one of the cooling members and the other of the cooling member are deformed in the arcuate body portion in a direction of extending the fixed groove portion, and the element is disposed in the fixed groove portion. A rectifying device for a rotating electrical machine characterized in that the rectifying element and the cooling member are integrated by fixing the rectifying element in the fixed groove portion by a configuration that solves the deformation .   4. The rectifier for a rotating electrical machine according to claim 1, wherein the plurality of fixed groove portions formed in the arc-shaped main body portion are formed in a tapered shape having a deep groove. 5.

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