JP2004187438A - Rotating electric machine for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine that can further improve reliability by preventing a leak between terminals of a capacitor element. <P>SOLUTION: A regulator 9 equipped to an AC generator for a vehicle is composed of a regulator case 92 in which a control circuit for adjusting a generation voltage is housed, the capacitor element 93 that comprises a high-potential side terminal 100 and a low-potential side terminal 101 and absorbs a surge generated by the voltage adjustment operation of the control circuit, a housing 94 that is formed to the regulator case 92 and houses the capacitor element 93, and a sealing resin 95 for the capacitor element 93 filled in the housing 94. The high-potential side terminal 100 and the low-potential side terminal 101 of the capacitor element 93 are exposed from the sealing resin 95, and a partition board 96 is arranged between the high-potential side terminal 100 and the low-potential side terminal 101. <P>COPYRIGHT: (C)2004,JPO&NCIPI

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 automotive alternator, a capacitor element is accommodated in an accommodation portion provided in the regulator case, and the capacitor element absorbs surge.
[0003]
[Patent Document 1]
JP-A-2000-209824 (page 3-5, FIG. 1-5)
[0004]
[Problems to be solved by the invention]
Meanwhile, the capacitor element included in the automotive alternator disclosed in Patent Document 1 described above has a high potential side terminal and a low potential side terminal, and is inserted into the capacitor housing outside the capacitor sealing resin. Connected to the connection terminal. Further, a thermosetting resin such as epoxy is generally used as the capacitor sealing resin, and is filled in a position recessed with respect to an end face (opening) of the capacitor housing portion due to heat shrinkage during thermosetting. Therefore, depending on the mounting direction of the automotive alternator on which the capacitor element is mounted, foreign matter such as salt water or muddy water accumulates in the dent of the capacitor sealing resin, and leakage between the high potential side terminal and the low potential side terminal (leakage). As a result, there is a problem that reliability is reduced. A structure in which the high-potential side terminal and the low-potential side terminal are sealed or protected with a resin or the like is also conceivable. Low.
[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 such a point, and an object of the present invention is to provide a vehicular rotating electric machine that can improve reliability by preventing leakage between terminals of a capacitor element. It is in.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a rotating electric machine for a vehicle according to the present invention includes a regulator case accommodating a control circuit for adjusting a voltage, a voltage adjustment operation having a high potential side terminal and a low potential side terminal, and a control circuit. A capacitor element that absorbs a surge generated by the capacitor element, a storage section formed in the regulator case for storing the capacitor element, and a resin for sealing the capacitor element filled in the storage section. The potential side terminal is exposed from the sealing resin, and a partition plate is provided between the high potential side terminal and the low potential side terminal. This makes it possible to prevent leakage between the terminals of the capacitor element with a simple configuration in which only a partition plate is added, thereby improving reliability.
[0008]
In addition, it is preferable that the above-mentioned storage portion has a groove formed on the inner wall surface, and the partition plate is inserted and fixed in the groove formed on the inner wall surface of the storage portion. This facilitates the positioning and fixing of the partition plate.
In addition, the above-described storage section has an opening at a position where the capacitor element is inserted, and each of the high potential side terminal and the low potential side terminal extends in a direction in which the capacitor element is inserted more than the opening. It is desirable that the height of the partition plate along the stretching direction is set higher than the heights of the high potential side terminal and the low potential side terminal. This can prevent foreign substances such as salt water and muddy water from accumulating above the height of the partition plate, more reliably prevent leakage between the terminals of the capacitor element, and further improve reliability. .
[0009]
Further, it is preferable that a plurality of the above-mentioned partition plates are formed at predetermined intervals along a direction in which the high potential side terminals and the low potential side terminals are arranged. This makes it possible to more reliably prevent leakage between the terminals of the capacitor element as compared with the case where the number of the partition plates is one.
[0010]
The above-described sealing resin is a thermosetting resin, and is filled at a position lower than the opening due to heat shrinkage after curing. In particular, when a thermosetting resin having such a shape is used, the effect of improving reliability by preventing leakage between terminals of the capacitor element becomes remarkable.
[0011]
Further, in the above-mentioned partition plate, it is desirable that the portion to be buried in the sealing resin has a widened portion that becomes wider as the buried position becomes deeper from the surface of the sealing resin. Thereby, the partition plate can be prevented from coming off from the sealing resin, and the partition plate can be more securely fixed.
[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. Near the rear end of the rotating shaft 33, two slip rings 37, 38 electrically connected to both ends of the field winding 31 are formed. Thus, power is supplied from the brush device 39 to the field winding 31.
[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 the rectifier 6 and other electric components (such as the brush device 39 and the regulator 9) attached to the outside of the rear frame 4 to protect them. 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, when a rotational force from an engine (not shown) is transmitted to the pulley 8 via a belt or the like, the rotor 3 rotates in a predetermined direction. 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 front view of the regulator 9. FIG. 3 is a side view of the regulator 9. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a sectional view taken along line VV of FIG.
The regulator 9 is a voltage regulator that adjusts a generated voltage by intermitting a field current flowing through the field winding 31. The regulator 9 has a regulator case 92 in which a control circuit 91 for adjusting the generated voltage is accommodated, and has a high potential side terminal 100 and a low potential side terminal 101, and absorbs a surge generated by the voltage adjustment operation of the control circuit 91. It is configured to include a capacitor element 93, a storage part 94 formed in the regulator case 92 for storing the capacitor element 93, and a sealing resin 95 of the capacitor element 93 filled in the storage part 94.
[0019]
The high potential side terminal 100 and the low potential side terminal 101 of the capacitor element 93 are exposed from the sealing resin 95, and a partition plate 96 is provided between the high potential side terminal 100 and the low potential side terminal 101. ing.
The storage portion 94 has a groove portion 102 on the inner wall surface, and the partition plate 96 is inserted and fixed in the groove portion 102. The storage section 94 has an opening 103 at a position where the capacitor element 93 is inserted, and a partition plate 96 is attached so as to divide the opening 103 into two.
[0020]
Each of the high-potential side terminal 100 and the low-potential side terminal 101 of the capacitor element 93 extends beyond the opening 103 in a direction in which the capacitor element 93 is inserted. A pair of connection terminals 104 and 105 protrude from a predetermined position around the housing 94 along the high-potential side terminal 100 and the low-potential side terminal 101 of the capacitor element 93. By connecting one connection terminal 104 and the high-potential-side terminal 100 and the other connection terminal 105 and the low-potential-side terminal 101, an electrical connection between them is established.
[0021]
The height of the partition plate 96 along the extension direction of the high potential side terminal 100 and the low potential side terminal 101 of the capacitor element 93 is set higher than the heights of the high potential side terminal 100 and the low potential side terminal 101. .
The capacitor element 93 is inserted through the opening 103, and a sealing resin 95 is filled in the gap between the main body 93 a of the capacitor element 93 and the inner wall surface of the storage section 94 through the opening 103. By completely filling the sealing resin 95 so as to be buried, the capacitor element 93 is fixed. As the sealing resin 95, a thermosetting epoxy resin is used.
[0022]
After filling the sealing resin 95 in this way, a partition plate 96 is inserted between the high-potential side terminal 100 and the low-potential side terminal 101 of the capacitor element 93 into the groove 102 formed on the inner wall surface of the storage portion 94. After being fixed, the sealing resin 95 is thermally cured. Since the sealing resin 95 is thermally contracted after curing, the surface position on the side of the opening 103 is recessed and lower than the opening surface of the opening 103, and is filled at a position lower than the opening 103 of the storage portion 94. Will be.
[0023]
The portion of the partition plate 96 buried in the sealing resin 95 forms a widened portion 96a that becomes wider as the buried position becomes deeper from the surface of the sealing resin 95. Accordingly, the partition plate 96 can be prevented from coming off from the cured sealing resin 95, and the partition plate 96 can be more securely fixed.
[0024]
As described above, in the regulator 9 provided in the automotive alternator 1 of the present embodiment, the sealing resin 95 is in a position recessed with respect to the end surface (opening surface) of the storage portion 94 due to thermal contraction during thermosetting. Even if foreign matter such as salt water or muddy water is deposited in the recesses, the high potential side terminal 100 and the low potential side terminal 101 of the capacitor element 93 are electrically isolated by the partition plate 96. Becomes possible. Therefore, it is possible to prevent leakage between the terminals of the capacitor element 93 with a simple configuration in which only the partition plate 96 is added, and to improve the reliability of the regulator 9 and the automotive alternator 1 using the regulator 9. be able to.
[0025]
Further, by inserting and fixing the partition plate 96 into the groove 102 formed on the inner wall surface of the storage portion 94, the positioning and fixing of the partition plate 96 become easy.
In addition, by setting the height of the partition plate 96 higher than the heights of the high-potential side terminal 100 and the low-potential side terminal 101 of the capacitor element 93, foreign substances such as salt water and muddy water can be set to be higher than the height of the partition plate 96. Accumulation can be prevented, and leakage between the terminals of the capacitor element 93 can be more reliably prevented to further improve reliability.
[0026]
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. For example, in the above-described embodiment, the partition plate 96 is attached after filling the sealing resin 95 and before thermosetting. However, the partition plate 96 is attached before filling the sealing resin 95 or the sealing resin 95 is heated. You may make it attach after hardening.
[0027]
In the above-described embodiment, one partition plate 96 is provided between the high-potential-side terminal 100 and the low-potential-side terminal 101 of the capacitor element 93. However, the high-potential-side terminal 100 and the low-potential-side terminal 101 are provided. A plurality of partition plates 96 may be arranged at predetermined intervals along the direction in which. This makes it possible to more reliably prevent leakage between the terminals of the capacitor element 93 as compared with the case where the number of the partition plates 96 is one.
[0028]
Further, in the above-described embodiment, the epoxy resin that thermally shrinks at the time of curing is used as the sealing resin 95. However, another thermosetting resin or another sealing resin that does not thermally cure may be used. Good. Even when a sealing resin that is not heat-cured is used, the same effect of preventing leakage between the terminals of the capacitor element 93 can be expected because a depression occurs on the surface depending on the filling method and amount. it can.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an overall configuration of an automotive alternator according to an embodiment.
FIG. 2 is a front view of the regulator.
FIG. 3 is a side view of the regulator.
FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;
FIG. 5 is a sectional view taken along line VV of FIG. 4;
[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 91 Control circuit 92 Regulator case 93 Capacitor element 94 Storage unit 95 Sealing resin 96 Partition plate 100 High potential side terminal 101 Low potential side terminal 102 Groove 103 Opening 104, 105 Connection terminal

Claims (6)

A regulator case accommodating a control circuit for adjusting a voltage, a capacitor element having a high-potential side terminal and a low-potential side terminal and absorbing a surge generated by a voltage adjusting operation by the control circuit, formed on the regulator case; In a rotating electrical machine for a vehicle, comprising: a storage portion for storing the capacitor element, and a resin for sealing the capacitor element filled in the storage portion.
The high potential side terminal and the low potential side terminal are exposed from the sealing resin, and a partition plate is provided between the high potential side terminal and the low potential side terminal. Electric machine. In claim 1,
The storage portion has a groove formed on an inner wall surface,
The rotating electric machine for a vehicle, wherein the partition plate is inserted and fixed in the groove formed in an inner wall surface of the storage section. In claim 1,
The storage section has an opening at a position where the capacitor element is inserted,
Each of the high-potential-side terminal and the low-potential-side terminal extends in a direction in which the capacitor element is inserted from the opening, and the height of the partition plate along the extending direction is the height. A rotating electric machine for a vehicle, wherein the height is set higher than the height of a potential side terminal and the low potential side terminal. In any one of claims 1 to 3,
A plurality of the partition plates are formed at predetermined intervals along a direction in which the high potential side terminal and the low potential side terminal are arranged. In claim 3,
The rotating electric machine for a vehicle, wherein the sealing resin is a thermosetting resin, and is filled at a position lower than the opening due to heat shrinkage after curing. In any one of claims 1 to 5,
A rotating electric machine for a vehicle, wherein the partition plate has a portion buried in the sealing resin, and the buried position forms a widened portion that becomes wider as the buried position becomes deeper from the surface of the sealing resin. .

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