JP4110919B2 - Rotating electric machine for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular rotating electrical machine mounted on a vehicle such as a passenger car or a truck.
[0002]
[Prior art]
The vehicle alternator charges a battery mounted in an engine room and supplies power to a headlight and other electric loads. The output voltage of this vehicle alternator is adjusted by intermittently supplying the field current flowing through the field winding. However, when the output voltage waveform is observed, it is known that a surge occurs due to the intermittent field current. It has been. If the generated surge is excessive, it may cause annoying noise for an electrical load such as an audio device, and may cause malfunction or failure for other electrical loads. As a conventional technique for reducing such a surge, an automotive alternator equipped with a capacitor element for absorbing a surge is known (see, for example, Patent Document 1). In this vehicle alternator, a capacitor element is accommodated in a component accommodating chamber provided in the regulator, and surge is absorbed by this capacitor element.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 6-46216 (page 2, Fig. 1-4)
[0004]
[Problems to be solved by the invention]
By the way, the capacitor | condenser storage part contained in the alternating current generator for vehicles disclosed by the patent document 1 mentioned above is under the high temperature atmosphere by the normal temperature atmosphere at the time of vehicle non-use, and the heat radiation of the vehicle side at the time of vehicle use, and heat dissipation of a regulator. If the temperature difference between these is used in both temperature environments and the temperature difference is large, the stress caused by the difference in thermal expansion between the resin of the regulator that forms the component storage chamber and the resin that fixes the capacitor element It may exceed the adhesive strength between. The PET film used for insulation between different electrodes inside the capacitor element has a property of easily absorbing moisture, and when absorbed, the PET film is decomposed and the basic function of absorbing the surge of the capacitor element is impaired. For this reason, the capacitor element is generally covered with a protective coating material for the purpose of moisture prevention. By covering the capacitor element with this protective coating material, the PET film contained in the capacitor element does not absorb moisture even when the adhesive force between the two resins is lost and the capacitor element is disposed at the interface between the two resins. . However, there is a problem that covering the outer periphery of the capacitor element with such a protective coding material leads to an increase in component costs.
[0005]
In recent years, the space for mounting AC generators for vehicles has been reduced as the engine room has become increasingly narrow due to the need for slant nose to reduce vehicle running resistance and the need to secure vehicle interior space. Yes. In addition, high reliability is also required for product quality such as the enforcement of the PL Law. However, on the other hand, due to intensifying cost competition among manufacturers, it is required to provide an inexpensive product for a vehicle AC generator. That is, it is required to provide a small and highly reliable vehicle alternator at low cost.
[0006]
The present invention was created in view of the above points, and an object of the present invention is to provide a vehicular rotating electrical machine capable of eliminating the protective coating material for the capacitor element and maintaining high reliability. It is in.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a rotating electrical machine for a vehicle according to the present invention houses a voltage regulator that adjusts a voltage, a capacitor element that absorbs a surge generated by a voltage adjustment operation by the voltage regulator, and the capacitor element. And a storage unit. Further, the storage portion has an opening on one end side, and a groove portion extending from the opening portion is formed. By inserting the element side terminal of the capacitor element into the groove portion, the inner wall surface of the storage portion and the capacitor element A sealing resin is filled in a gap formed between the outer peripheral surface and the outer peripheral surface. By filling the space formed around the capacitor element with the sealing resin, the entire circumference of the capacitor element can be covered with the sealing resin, so that water enters the periphery of the capacitor element and the inside absorbs moisture. It is possible to prevent the deterioration of the reliability of the capacitor element and the vehicular rotating electrical machine using the capacitor element.
[0008]
Moreover, it is preferable that the groove portion described above has a shape that stops at one end formed on each of two opposing inner wall surfaces of the storage portion, and the element-side terminal protrudes outward from the main body portion of the capacitor element. This makes it possible to reliably form a gap between the outer peripheral portion of the capacitor element and the inner wall surface of the storage portion, and the entire periphery of the capacitor element can be reliably covered with the sealing resin.
[0009]
Further, the capacitor element described above is preferably housed in the housing portion by inserting the element side terminal protruding outward from the main body portion until a part of the element side terminal hits along the groove portion. This facilitates the positioning of the capacitor element in the storage portion, and it is possible to form a predetermined space formed around the capacitor element.
[0010]
Further, it is desirable that a protective coating material is not formed on the outer peripheral surface of the capacitor element described above. By covering the entire circumference of the capacitor element with the sealing resin, it is possible to prevent moisture absorption of the capacitor element without using a protective coating material, thereby reducing the component cost.
[0011]
The sealing resin described above is preferably an epoxy resin. Thereby, the moisture absorption of a capacitor | condenser element can be prevented reliably like the case where a protective coating material is used.
Moreover, it is desirable that the element side terminal described above is formed by a round wire. Thereby, it becomes possible to manufacture an element side terminal by cutting and shaping a continuous line of round wires into a predetermined length, and productivity can be improved as compared with the case of using a plate material or the like.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
The vehicular rotating electrical machine of the present invention can be applied to a vehicular AC generator mounted on, for example, an engine and driven to rotate by the engine.
Hereinafter, an AC generator for a vehicle according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a diagram illustrating an overall configuration of a vehicle AC generator according to the present embodiment. The vehicle alternator 1 shown in FIG. 1 includes a stator 2, a rotor 3, a rear frame 4, a front frame 5, a rectifier 6, a rear cover 7, a pulley 8, a regulator 9, and the like.
[0014]
The stator 2 functions as an armature, and includes a stator core 22 and a three-phase stator winding 23.
The rotor 3 has a structure in which a field winding 31 in which an insulated copper wire is wound in a cylindrical and concentric manner is sandwiched from both sides through a rotating shaft 33 by a pole core 32 having six claws. have. A cooling fan 35 for discharging the cooling air sucked from the front side in the axial direction and the radial direction is attached to the end face of the pole core 32 on the front side by welding or the like. Similarly, a cooling fan 36 for discharging the cooling air sucked from the rear side in the radial direction is attached to the end surface of the pole core 32 on the rear side by welding or the like. In addition, two slip rings 37 and 38 that are electrically connected to both ends of the field winding 31 are formed in the vicinity of the rear side end portion of the rotating shaft 33, and the slip rings 37 and 38 are interposed through these slip rings 37 and 38. Then, power is supplied to the field winding 31 from a brush device (not shown).
[0015]
The rear frame 4 and the front frame 5 accommodate the stator 2 and the rotor 3, and the rotor 3 is supported in a state in which the rotor 3 can rotate about the rotation shaft 33. Further, the stator 2 disposed on the outer peripheral side of the pole core 32 of the rotor 3 via a predetermined gap is fixed to the front frame 5.
[0016]
The rectifier 6 is for rectifying the three-phase AC voltage, which is the output voltage of the three-phase stator winding 23, to obtain DC output power.
The rear cover 7 covers and protects the rectifying device 6 and other electrical components (such as a brush device and a regulator 9) attached to the outside of the rear frame 4. The rear cover 7 is fastened and fixed by a metal nut 71 to a bolt 41 extending from the rear frame 4 with the rectifying device 6 sandwiched therebetween. The rear cover 7 has a plurality of suction windows mainly on the opposed surface of the rectifier 6, and cooling air is sucked into the rear cover 7 through the suction windows.
[0017]
In the vehicle alternator 1 having the above-described structure, the rotor 3 rotates in a predetermined direction when a rotational force from an engine (not shown) is transmitted to the pulley 8 via a belt or the like. In this state, by applying an excitation voltage from the outside to the field winding 31 of the rotor 3, each claw portion of the pole core 32 is excited, and a three-phase AC voltage can be generated in the stator winding 23. A predetermined direct current is taken out from an output terminal provided in the rectifier 6.
[0018]
FIG. 2 is a perspective view of the regulator 9. FIG. 3 is a diagram showing a method of fixing the capacitor element provided in the regulator 9.
The regulator 9 is a voltage regulator that controls the generated voltage by intermittently switching the field current flowing through the field winding 31. The regulator 9 includes a metal heat radiating portion 10 that radiates heat generated in a switching element (not shown) that interrupts the field current, a control circuit that controls the intermittent state of the switching element, and various terminals. And the resin part 11 to be configured. The resin part 11 includes a storage part 12 formed to store the capacitor element 15 by using a part thereof, and a part of the resin part 11 protruding from a predetermined position around the storage part 12. Resin-side terminals 16a and 16b are provided for joining and energizing 15a and 15b.
[0019]
The capacitor element 15 is for absorbing a surge generated by the voltage adjustment operation by the regulator 9. The capacitor 15 has two element-side terminals 15a and 15b protruding outside the main body 15c. A protective coating material is not formed on the outer peripheral surface of the main body portion 15c. The element side terminals 15a and 15b are formed by bending a metal plate having a rectangular cross section with a predetermined length twice in a right angle direction, and are attached to two side surfaces of the cylindrical main body 15c.
[0020]
The storage portion 12 has an opening 13 on one end side, and two groove portions 14a and 14b extending from the opening 13 are formed on the inner wall surfaces facing each other. These groove portions 14 a and 14 b have one-end-stopped shapes formed on two opposing inner wall surfaces of the storage portion 12.
[0021]
The storage of the capacitor element 15 in the storage portion 12 is performed by replacing each of the two element side terminals 15a and 15b protruding outward from the main body portion 15c of the capacitor element 15 with a part of these element side terminals 15a and 15b. Is carried out by inserting until it hits along the grooves 14a and 14b. By inserting the element-side terminals 15a and 15b of the capacitor element 15 into the groove portions 14a and 14b having one end-stopped shape, the storage position of the storage unit 12 other than the insertion direction of the capacitor element 15 can be determined with high accuracy. Further, the element-side terminals 15a, 15b of the capacitor element 15 and the resin-side terminals 16a, 16b are joined in the insertion direction of the capacitor element 15, so that the storage position along the insertion direction can be determined with high accuracy. . Since the storage position can be determined with high accuracy in this way, a constant interval can be secured between the inner wall surface of the storage portion 12 and the outer peripheral surface of the main body portion 15c of the capacitor element 15. After the capacitor element 15 is stored in the storage portion 12 in this way, the sealing resin 17 is filled through the opening 13 between the main body portion 15c of the capacitor element 15 and the inner wall surface of the storage portion 12, In addition, the capacitor element 15 is fixed by filling the main body portion 15 c so as to be completely buried in the sealing resin 17. As the sealing resin 17, an epoxy resin that does not absorb moisture is used.
[0022]
As described above, in this embodiment, the sealing resin 17 is covered with the sealing resin 17 by filling the space formed around the capacitor element 15 with the sealing resin 17. Therefore, it is possible to prevent water from entering the periphery of the capacitor element 15 to absorb moisture inside the main body 15c, and the reliability of the capacitor element 15 and the vehicle alternator 1 using the capacitor element 15 can be prevented. Can be prevented.
[0023]
In particular, by using a material that does not absorb moisture, such as an epoxy resin, as the sealing resin 17, it is possible to maintain reliability without covering the outer periphery of the main body portion 15 c with a protective coating material.
The groove portions described above form one-stop groove portions 14a and 14b on each of two opposing inner wall surfaces of the storage portion 12, and the element side terminals 15a and 15b of the capacitor element 15 are located outside the main body portion 15c. Thus, it is possible to reliably form a gap between the outer peripheral portion of the main body portion 15c of the capacitor element 15 and the inner wall surface of the storage portion 12, and the entire periphery of the capacitor element 15 is reliably sealed. The resin 17 can be covered.
[0024]
Further, the element-side terminals 15a and 15b protruding outward from the main body portion 15c of the capacitor element 15 are inserted until a part of the element-side terminals 15a and 15b hits along the groove portions 14a and 14b of the storage portion 12. This facilitates the positioning of the capacitor element 15 in the storage portion 12 and allows a predetermined space to be formed around the capacitor element 15. Therefore, by filling this space with the sealing resin 17 The entire circumference of the capacitor element 15 can be reliably covered with the sealing resin 17.
[0025]
In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. In the embodiment described above, the element side terminals 15a and 15b of the capacitor element 15 are formed using a plate material. However, as shown in FIG. 4, an element side terminal 15d formed by a round wire may be used. In this case, it is possible to form the element-side terminal 15d by cutting a continuous line of round wires into a predetermined length and then shaping it, thereby improving productivity as compared with the case of using a plate material or the like. Can do.
[0026]
In the embodiment described above, an epoxy resin is used as the sealing resin 17. However, a resin other than the epoxy resin may be used as long as it does not absorb moisture.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of an automotive alternator according to an embodiment.
FIG. 2 is a perspective view of a regulator.
FIG. 3 is a diagram illustrating a method of fixing a capacitor element provided in a regulator.
FIG. 4 is a partial diagram illustrating a modification of the capacitor element.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle alternator 2 Stator 3 Rotor 4 Rear frame 5 Front frame 6 Rectifier 7 Rear cover 9 Regulator 10 Heat radiation part 11 Resin part 12 Storage part 13 Opening part 14a, 14b Groove part 15 Capacitor element 15a, 15b Element side terminal 15c Main body portions 16a and 16b Resin side terminals 17 Sealing resin

Claims (5)

In a rotating electrical machine for a vehicle having a voltage regulator that adjusts a voltage, a capacitor element that absorbs a surge generated by a voltage adjustment operation by the voltage regulator, and a storage unit that stores the capacitor element,
The storage portion has an opening on one end side, and a groove extending from the opening is formed,
One surface of the groove is provided with a resin side terminal to be joined to the element side terminal of the capacitor,
The groove portion has a one-end stop shape formed on each of the two inner wall surfaces facing the storage portion,
The element side terminal protrudes outward from the main body of the capacitor element,
By inserting the element side terminal of the capacitor element into the groove, a storage position other than the insertion direction of the capacitor element is determined, and the element side terminal and the resin side terminal are joined in the insertion direction,
A sealing resin is filled in a gap formed between an inner wall surface of the storage portion and an outer peripheral surface of the capacitor element by inserting an element side terminal of the capacitor element into the groove portion. Rotating electric machine for vehicles. In claim 1,
The capacitor element is housed in the housing part by inserting the element side terminal protruding outward from the main body part until a part of the element side terminal hits the groove part. Rotating electric machine for vehicles. In claim 1 or 2,
A rotating electrical machine for a vehicle, wherein a protective coating material is not formed on an outer peripheral surface of the capacitor element. In claim 1 or 2,
The vehicular rotating electrical machine, wherein the sealing resin is an epoxy resin. In claim 1 or 2,
The vehicular rotating electrical machine, wherein the element side terminal is formed by a round wire.

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