JP2004147439A - Rotating machine for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating machine for a vehicle which abolishes a protective coating material of a capacitor element and which can maintain high reliability. <P>SOLUTION: An AC generator for the vehicle includes a regulator 9 for regulating a voltage, the capacitor element 15 for absorbing a surge generated by a voltage regulating operation of the regulator 9, and a containing part 12 for containing the capacitor element 15. The containing part 12 has an opening 13 at one end side. Grooves 14a and 14b extended from this opening 13 are formed on facing two inner wall surfaces. A sealing resin 17 is filled in a gap formed between the inner wall surface of the containing part 12 and an outer peripheral surface of the capacitor element 15 by inserting the element side terminals 15a and 15b of the capacitor element 15 into the grooves 14a and 14b, respectively. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotating electric machine for a vehicle 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 headlights and other electric loads. The output voltage of the automotive alternator is adjusted by interrupting the field current flowing through the field windings. However, when observing the output voltage waveform, it is known that surge occurs due to the interrupted field current. Have been. If the generated surge is excessive, it may cause annoying noise to an electric load such as an audio device, and may cause a malfunction or a failure to other electric loads. As a conventional technique for reducing such a surge, an automotive alternator equipped with a surge absorbing capacitor element is known (for example, see Patent Document 1). In this vehicle alternator, a capacitor element is accommodated in a component accommodation chamber provided in the regulator, and the capacitor element absorbs surge.
[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 accommodating portion included in the vehicle alternator disclosed in Patent Document 1 described above is used under a normal temperature atmosphere when the vehicle is not used and under a high temperature atmosphere due to the heat radiation of the vehicle side and the heat radiation of the regulator when the vehicle is used. When used in both temperature environments and these temperature differences are large, the stress caused by the difference in thermal expansion between the resin of the regulator that forms the component housing and the resin that fixes the capacitor element causes May exceed the adhesive strength between them. A PET film used for insulation between different types of electrodes inside a capacitor element has a property of easily absorbing moisture. If moisture is absorbed, the PET film is decomposed, and the basic function of absorbing 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 preventing moisture. By covering the capacitor element with this protective coating material, even when the adhesive force between the two resins is lost and the capacitor element is disposed at the interface between the two resins, the PET film included in the capacitor element does not absorb moisture. . 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 cost.
[0005]
Particularly in recent years, as the engine room has become increasingly smaller due to the need for slant nose to reduce vehicle running resistance and the need to secure vehicle interior living space, there is no room for mounting space for vehicle alternators. I have. In addition, high reliability is required in terms of product quality such as the enforcement of the PL law. However, on the other hand, due to intensified cost competition between manufacturers, it is required to provide inexpensive products for vehicle alternators. That is, it is required to provide a small and highly reliable vehicle alternator at low cost.
[0006]
The present invention has been made in view of the above points, and an object of the present invention is to provide a rotating electric machine for a vehicle that can maintain high reliability while eliminating a protective coating material for a capacitor element. It is in.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a vehicular rotating electric machine of the present invention houses a voltage regulator for adjusting a voltage, a capacitor element for absorbing a surge generated by a voltage adjustment operation by the voltage regulator, and a capacitor element. And a storage unit. The storage section has an opening on one end side, and a groove extending from the opening is formed. By inserting the element-side terminal of the capacitor element into the groove, the inner wall surface of the storage section and the capacitor element are removed. A gap formed between the outer peripheral surface and the outer peripheral surface is filled with a sealing resin. By filling the sealing resin in the space formed around the capacitor element, the entire circumference of the capacitor element can be covered with the sealing resin, so that water infiltrates around the capacitor element and the inside absorbs moisture. Can be prevented, and the reliability of the capacitor element and the rotating electrical machine for a vehicle using the same can be prevented from lowering.
[0008]
Further, it is preferable that the above-mentioned groove has one end stop shape formed on each of two opposing inner wall surfaces of the storage portion, and the element-side terminal protrudes outside the main body of the capacitor element. Thus, a gap can be reliably formed between the outer peripheral portion of the capacitor element and the inner wall surface of the storage section, and the entire circumference of the capacitor element can be reliably covered with the sealing resin.
[0009]
In addition, it is preferable that the above-described capacitor element is housed in the housing section by inserting an element-side terminal projecting outside the main body portion until a part of the element-side terminal abuts along the groove. This facilitates the positioning of the capacitor element in the storage section, and makes it 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 above-described capacitor element. By covering the entire periphery of the capacitor element with the sealing resin, it is possible to prevent the capacitor element from absorbing moisture without using a protective coating material, thereby reducing component costs.
[0011]
Further, the above-described sealing resin is preferably an epoxy resin. Thereby, similarly to the case where the protective coating material is used, moisture absorption of the capacitor element can be reliably prevented.
Further, it is desirable that the above-mentioned element side terminal is formed by a round wire. This makes it possible to manufacture the element-side terminals by cutting and shaping a continuous round wire to a predetermined length, thereby improving the productivity as compared with the case where a plate or the like is used.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
INDUSTRIAL APPLICABILITY The rotating electric machine for a vehicle of the present invention can be applied to, for example, a vehicle AC generator mounted on an engine and driven to rotate by the engine.
Hereinafter, an automotive alternator according to an embodiment of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 is a diagram illustrating an overall configuration of a vehicle alternator 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 obtained by winding an insulated copper wire cylindrically and concentrically is sandwiched from both sides through a rotating shaft 33 by pole cores 32 each having six claws. have. Further, 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 an 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 in from the rear side in the radial direction is attached to the end face of the pole core 32 on the rear side by welding or the like. In the vicinity of the rear end of the rotating shaft 33, two slip rings 37 and 38 electrically connected to both ends of the field winding 31 are formed. Thus, power is supplied to the field winding 31 from a brush device (not shown).
[0015]
The rear frame 4 and the front frame 5 house the stator 2 and the rotor 3, and the rotor 3 is supported so as to be rotatable about a rotation shaft 33. Further, the stator 2 arranged 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 rectifies a three-phase AC voltage, which is an output voltage of the three-phase stator winding 23, to obtain DC output power.
The rear cover 7 covers and protects the rectifier 6 and other electric 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 to a bolt 41 extending from the rear frame 4 by a metal nut 71 with the rectifier 6 sandwiched therebetween. Further, the rear cover 7 has a plurality of suction windows mainly on a surface facing the rectifying device 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 to the field winding 31 of the rotor 3 from the outside, each claw 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 extracted from an output terminal provided in the rectifier 6.
[0018]
FIG. 2 is a perspective view of the regulator 9. FIG. 3 is a view showing a method of fixing a capacitor element provided in the regulator 9.
The regulator 9 is a voltage regulator that controls a generated voltage by intermitting a field current flowing through the field winding 31. The regulator 9 has a built-in metal radiator 10 for radiating heat generated in a switching element (not shown) for interrupting a field current, a control circuit for controlling the interrupted state of the switching element, and various terminals. And a resin portion 11. The resin part 11 has a housing part 12 formed to house the capacitor element 15 by utilizing a part thereof, and a part protruding from a predetermined position around the housing part 12 so that the element side terminal of the capacitor element 15 It has resin-side terminals 16a and 16b to be connected to 15a and 15b to conduct electricity.
[0019]
The capacitor element 15 is for absorbing a surge generated by the voltage adjusting operation of the regulator 9. The capacitor 15 has two element-side terminals 15a and 15b protruding outside the main body 15c. No protective coating material is formed on the outer peripheral surface of the main body 15c. The element-side terminals 15a and 15b are formed by bending a metal plate having a rectangular cross section and a predetermined length two times in a right angle direction, and are attached to two side surfaces of a cylindrical main body 15c.
[0020]
The storage section 12 has an opening 13 on one end side, and two grooves 14a and 14b extending from the opening 13 are formed on the opposing inner wall surfaces. These grooves 14a and 14b have one-stopped shapes formed on two opposing inner wall surfaces of the storage unit 12, respectively.
[0021]
The storage of the capacitor element 15 in the storage part 12 is performed by replacing each of the two element-side terminals 15a and 15b protruding outside the main body part 15c of the capacitor element 15 with a part of the element-side terminals 15a and 15b. Is inserted until it abuts along the grooves 14a, 14b. By inserting the element-side terminals 15a and 15b of the capacitor element 15 into the grooves 14a and 14b having the shape of one end, the storage position of the storage section 12 other than the insertion direction of the capacitor element 15 can be determined with high accuracy. Further, since the element-side terminals 15a and 15b of the capacitor element 15 and the resin-side terminals 16a and 16b are joined in the insertion direction of the capacitor element 15, 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 manner, a fixed interval can be secured between the inner wall surface of the storage portion 12 and the outer peripheral surface of the main body 15c of the capacitor element 15. After the capacitor element 15 is stored in the storage section 12 in this manner, the sealing resin 17 fills the gap between the main body 15c of the capacitor element 15 and the inner wall surface of the storage section 12 through the opening 13, Moreover, the capacitor element 15 is fixed by filling the main body portion 15c 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 the present embodiment, by filling the space formed around the capacitor element 15 with the sealing resin 17, the entire periphery of the main body 15 c of the capacitor element 15 is covered with the sealing resin 17. Therefore, it is possible to prevent water from entering the periphery of the capacitor element 15 and to absorb moisture inside the main body portion 15c, and the reliability of the capacitor element 15 and the automotive alternator 1 using the same can be prevented. Can be prevented from decreasing.
[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 15c with a protective coating material.
In addition, the above-mentioned grooves form grooves 14a and 14b each having a shape of one end stopped on each of two opposing inner wall surfaces of the storage unit 12, and the element-side terminals 15a and 15b of the capacitor element 15 are located outside the main body 15c. , It is possible to reliably form a gap between the outer peripheral portion of the main body 15 c of the capacitor element 15 and the inner wall surface of the storage section 12, thereby securely sealing the entire circumference of the capacitor element 15. It can be covered with the resin 17 for use.
[0024]
Further, the device-side terminals 15a, 15b projecting outside the main body 15c of the capacitor device 15 are inserted until a part of the device-side terminals 15a, 15b abuts along the grooves 14a, 14b of the housing 12. This facilitates the positioning of the capacitor element 15 in the storage section 12 and allows a predetermined space to be formed around the capacitor element 15. 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]
Note that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. In the above-described embodiment, 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 the continuous line of the round wire to a predetermined length and then shaping the same, thereby improving the productivity as compared with the case of using a plate material or the like. Can be.
[0026]
In the above-described embodiment, an epoxy resin is used as the sealing resin 17, but a resin other than the epoxy resin may be used as long as the resin does not absorb moisture.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall configuration of a vehicle 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 view showing a modification of the capacitor element.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 vehicle alternator 2 stator 3 rotor 4 rear frame 5 front frame 6 rectifier 7 rear cover 9 regulator 10 radiator 11 resin 12 housing 13 opening 14a, 14b groove 15 capacitor element 15a, 15b element side terminal 15c Body parts 16a, 16b Resin side terminal 17 Resin for sealing

Claims (6)

A voltage regulator for adjusting a voltage, a capacitor element for absorbing a surge generated by a voltage adjustment operation by the voltage regulator, and a rotating electric machine for a vehicle having a storage unit for storing the capacitor element.
The storage section has an opening on one end side, and a groove extending from the opening is formed,
By inserting an element-side terminal of the capacitor element into the groove, a gap formed between an inner wall surface of the housing portion and an outer peripheral surface of the capacitor element is filled with a sealing resin. Electric rotating machine for vehicles. In claim 1,
The groove portion has a one-end stop shape formed on each of the two inner wall surfaces facing each other of the storage portion,
The rotating electric machine for a vehicle, wherein the element-side terminal protrudes outside a main body of the capacitor element. In claim 1 or 2,
The capacitor element is housed in the housing part by inserting the element-side terminal projecting outward from the main body part until a part of the element-side terminal abuts along the groove. Vehicle-side rotating electric machine. In any one of claims 1 to 3,
A rotating electric machine for a vehicle, wherein a protective coating material is not formed on an outer peripheral surface of the capacitor element. In any one of claims 1 to 3,
The rotating electric machine for a vehicle, wherein the sealing resin is an epoxy resin. In any one of claims 1 to 3,
The rotating electric machine for a vehicle, wherein the element-side terminal is formed by a round wire.

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