JP2015208177A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine which prevents removal of a cover caused by vibration in a more reliable manner and concurrently reduces foreign objects adhering to a component at the inner side of the cover.SOLUTION: A cover 28 is coupled to a connecting board by multiple coupling parts (snap fit parts) 29. Each coupling part 29 includes: a claw part provided in the connecting board 27; and a hook provided at the cover 28. The hook hooks on the claw part thereby causing the cover 28 to be coupled to the connecting board 27 and fixed thereto. The cover 28 includes: a cover body 28b having a rectangular parallelepiped shape along an outer peripheral shape of an inverter assembly 2; and multiple protruding parts 28c which protrude from a plane part (a straight line part) of an outer periphery of the cover body 28b to the outer side. A pair of curved line parts (round parts) is provided in each protruding part 28c and the hooks are respectively formed at the curved parts.

Description

  The present invention relates to a rotating electrical machine such as an alternator or a motor generator, and more particularly to a rotating electrical machine having a cover that covers a heat generating component.

  For example, in a rotating electrical machine such as an alternator and a motor generator, a heat generating component such as a rectifier circuit and a brush may be disposed outside a rear bracket that holds the rotor in order to perform efficient cooling. In such a case, a rear cover for protecting and electrically insulating parts arranged outside the rear bracket is fixed to the rear bracket.

  Moreover, the rear cover of the conventional rotary electric machine has a cylindrical side wall part and a disk part which covers one opening of a side wall part. The side wall portion has a first cylindrical portion and a second cylindrical portion having a smaller diameter than the first portion. Thus, a radial step is provided between the first cylindrical portion and the second cylindrical portion. The stepped portion is provided with a plurality of fixing openings spaced from each other in the circumferential direction. The rear bracket is provided with a plurality of claw portions to be inserted into the fixing opening. In addition, a large number of air supply ports are provided in the side wall portion and the disc portion of the rear cover (see, for example, Patent Document 1).

International Publication No. 2011-061281 Specification

  In the conventional rotating electric machine as described above, since the side wall portion of the rear cover is cylindrical, when a rectangular parallelepiped part is arranged inside the rear cover, a large gap is generated between the rear cover and the rectangular parallelepiped part. There was a problem that the foreign matter that entered from the air mouth adhered to the part and the cooling performance was lowered.

  The present invention has been made to solve the above-described problems, and can prevent adhesion of foreign matters to electronic components inside the cover while more reliably preventing the cover from coming off due to vibration. The object is to obtain a rotating electrical machine.

  The rotating electrical machine according to the present invention includes a rotor, a stator, and a drive unit having a rotor and a housing that holds the stator, and is fixed to the drive unit and includes a plurality of electronic components. The inverter assembly and the cover for protecting the inverter assembly are provided, the member provided in the drive portion is provided with a plurality of claw portions, and the cover is provided with a plurality of hooks that are hung on the claw portions. The cover is coupled to the drive unit by hooking the hook on the claw portion, and the cover is partially covered from the outer periphery of the cover main body to the outer periphery of the cover main body provided with at least one flat portion on the outer periphery. And a plurality of curved portions are provided at the tip of the convex portion, and the hook is provided on the curved portion.

  In the rotating electrical machine of the present invention, since the flat portion is provided on the outer periphery of the cover body, the electronic component can be arranged along the flat portion even when the electronic component is configured in a rectangular parallelepiped shape. The gap between the outer periphery and the electronic component can be reduced, and adhesion of foreign matter to the electronic component inside the cover can be reduced. Moreover, since the convex part was formed in the cover and the hook was provided in the curved part of the convex part, it is difficult for the hook to come off from the claw part with respect to vibration, and the removal of the cover due to vibration can be prevented more reliably.

It is sectional drawing of the rotary electric machine by Embodiment 1 of this invention. It is a rear view which shows the rotary electric machine of FIG. It is a rear view which shows the state before mounting | wearing with the rotary electric machine of FIG. It is the front view which looked at the cover of FIG. 1 from the inverter assembly side. It is explanatory drawing which shows the relationship between a hook and a nail | claw part when a vibration is added to the cover of FIG. It is a rear view which shows the rotary electric machine by Embodiment 2 of this invention. It is sectional drawing which follows the VII-VII line of FIG. It is a rear view which shows the rotary electric machine by Embodiment 3 of this invention. It is sectional drawing which follows the IX-IX line of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a cross-sectional view of a rotating electrical machine according to Embodiment 1 of the present invention. In this example, a rotating electrical machine for a vehicle mounted on an automobile is shown. In the figure, the rotating electrical machine includes a drive unit 1 and an inverter assembly 2 roughly.

  The drive unit 1 mainly includes a rotor 3, a stator 4, a front bracket (front housing) 5 which is a part of a housing, a rear bracket (rear housing) 6 which is a part of the housing, a first bearing 7, 2 bearings 8 and pulleys 9. The rotor 3 and the stator 4 are accommodated inside the front bracket 5 and the rear bracket 6. The first bearing 7 is held by the front bracket 5. The second bearing 8 is held by the rear bracket 6. The size of the second bearing 8 is smaller than the size of the first bearing 7.

  The rotor 3 includes a rotary shaft 10 rotatably supported by first and second bearings 7 and 8, a field core 11 fixed to the rotary shaft 10, and a field winding wound around the rotary shaft 10. 12. A first axial end portion (right end portion in FIG. 1) of the rotating shaft 10 protrudes outside the front bracket 5.

  The pulley 9 is fixed to the first axial end of the rotating shaft 10. The pulley 9 is connected to an internal combustion engine (not shown) via a belt (not shown), and transmits and receives torque to and from the internal combustion engine.

  A second axial end portion (left end portion in FIG. 1) of the rotor 3 projects out of the rear bracket 6. A slip ring 13 for supplying a field current to the field winding 12 is provided at the second axial end of the rotor 3.

  A brush holder 14 is disposed on the side of the rear bracket 6 opposite to the field core 11. The brush holder 14 is fixed to the inverter assembly 2. The brush 15 is held by the brush holder 14. The tip of the brush 15 is in contact with the outer peripheral surface of the slip ring 13.

  A first centrifugal fan 16 is fixed to the end surface of the field iron core 11 on the pulley 9 side. A second centrifugal fan 17 is fixed to the end face of the field core 11 on the inverter assembly 2 side. The first and second centrifugal fans 16 and 17 generate cooling air by the rotation of the rotor 3.

  The stator 4 has a stator core 18 and a three-phase stator winding 19 wound around the stator core 18.

  The inverter assembly 2 mainly includes a rectifier module (power module) 21, a field module 22, a cooling heat sink 23, a case 24, and a control module 25.

  The rectifier module 21 is a collection of switching elements for supplying armature current during driving and rectifying armature current during power generation together with peripheral circuits. That is, the rectifier module 21 is an electronic component in which a switching element for energizing the stator 4 is arranged on a lead frame for electrical wiring and molded with a resin material.

  The field module 22 is a collection of switching elements for controlling field current together with peripheral circuits. That is, the field module 22 is an electronic component in which a switching element for supplying a field current is arranged on a lead frame for electrical wiring and molded with a resin material.

  The rectifier module 21 and the field module 22 are mounted on a cooling heat sink 23 for cooling them.

  The case 24 has a terminal connected to the power system terminals of the rectifier module 21 and the field module 22. The control module 25 is an electronic component having a control circuit for controlling the rectifier module 21 and the field module 22.

  A magnetic pole position detection sensor 26 that detects the rotational state of the rotor 3 is provided between the slip ring 13 and the second bearing 8 outside the rear bracket 6. The magnetic pole position detection sensor 26 is arranged coaxially with the rotary shaft 10 and detects the magnetic pole position of the rotor 3. Further, the magnetic pole position detection sensor 26 includes a sensor stator 26a and a sensor rotor 26b composed only of an iron core.

  The sensor stator 26 a is attached to the cooling heat sink 23. The signal wiring from the sensor stator 26 a is connected to the control module 25. The sensor rotor 26b is fixed to the rotary shaft 10 and is disposed inside the sensor stator 26a.

  A plurality of bosses 6 a for attaching the inverter assembly 2 are formed on the rear side of the rear bracket 6. A connecting board 27 is attached and fixed to the end of the drive unit 1 on the inverter assembly 2 side.

  Further, the inverter assembly 2 is covered with a cover 28 for protecting and electrically insulating the inverter assembly 2 and the brush 15. The cover 28 is coupled to the drive unit 1 by a plurality of coupling portions (snap fit portions) 29 (only one location is shown in FIG. 1).

  Each coupling portion 29 includes a claw portion 27 a and an elastically deformable hook 28 a provided on the cover 28. The claw portion 27 a is provided on a member provided in the drive unit 1 (a member included in the drive unit 1 or a member fixed to the drive unit 1), here, the connecting board 27. The cover 28 is coupled and fixed to the connecting board 27, that is, the drive unit 1 by hooking the hook 28a to the claw portion 27a.

  FIG. 2 is a rear view showing the rotating electric machine of FIG. 1, and is a view seen from the direction of arrow II in FIG. 3 is a rear view showing a state before the cover 28 is attached to the rotating electrical machine of FIG. 2, and FIG. 4 is a front view of the cover 28 of FIG. 1 viewed from the inverter assembly 2 side.

  The outer shape of each module 21, 22, 25 is a rectangular parallelepiped. The planar shape of the cooling heat sink 23, that is, the planar shape of the inverter assembly 2 is rectangular in order to improve the mountability of each module 21, 22, 25 and simplify the configuration of the peripheral circuit. The cooling heat sink 23 and the case 24 have a structure in which the modules 21, 22 and 25 are mounted and sealed with resin or the like. Thereby, the external shape of the inverter assembly 2 is a rectangular parallelepiped shape.

  The inverter assembly 2 is fixed to the boss 6 a of the rear bracket 6 with a plurality of screws 31 after the connecting board 27 is mounted on the drive unit 1. Thereafter, the brush holder 14 is disposed in a space through which the central rotary shaft 10 of the inverter assembly 2 passes and is fixed to the inverter assembly 2. Then, the cover 28 is attached by the coupling portion 29.

  The cover 28 has a rectangular parallelepiped-shaped cover main body 28b that follows the outer peripheral shape of the inverter assembly 2, and a plurality (three in this example) of the cover main body 28b that protrude outward from a flat surface portion (straight line portion) of the outer periphery. And a convex portion 28c. The convex portion 28c partially protrudes from the three flat portions, that is, the three side surfaces of the cover main body 28b. A pair of curved portions (R portions) are provided at both ends in the width direction at the tip of each convex portion 28c, and hooks 28a are formed on these curved portions.

  Each coupling portion 29 is arranged on the outer side in the radial direction of the rotating electrical machine than the first and second centrifugal fans 16 and 17. A plurality of outside air introduction holes 28d are provided at the center of the cover body 28b. These outside air introduction holes 28d are arranged radially inward of the rotating electrical machine with respect to the built-in electronic components (here, the rectifier module 21 and the field module 22). Further, the outside air introduction hole 28d is arranged on the radially inner side of the rotating electrical machine with respect to the first and second centrifugal fans 16 and 17.

  In such a rotating electrical machine, since the flat portion is provided on the outer periphery of the cover main body 28b, the rectifier module 21, the field module 22 and the control module 25 can be arranged along the flat portion. The gap between the outer periphery of 28 and the modules 21, 22, 25 can be reduced, and adhesion of foreign matter to the modules 21, 22, 25 and the brush 15 can be reduced.

  Further, since the convex portion 28c is formed on the cover 28 and the hook 28a is provided on the curved portion of the convex portion 28c, the hook is difficult to come off from the claw portion with respect to vibration, and the cover is prevented from coming off due to vibration more reliably. Can do.

  That is, the vibration from the vehicle is easily received by the straight portion (plane portion) of the cover 28 in a vertical direction. However, as shown in FIG. However, as long as the hook 28a has an R shape, the hook 28a is less likely to be detached from the claw portion 27a, and has a structure resistant to circumferential vibration.

  Furthermore, since the coupling portion 29 has a snap-fit structure in which the hook 28a is hooked on the claw portion 27a, the cover 28 can be made difficult to come off against vibration with a simple configuration.

  Furthermore, since the outer shapes of the modules 21, 22, and 25 are rectangular parallelepiped and the outer shape of the cover body 28 b is also a rectangular parallelepiped shape that follows the outer peripheral shape of the inverter assembly 2, all the modules 21, 22, 25 and covers 28 can be reduced, and the arrangement of the modules 21, 22, and 25 is facilitated. Further, since the modules 21, 22, and 25 can be formed into simple shapes, the development period can be shortened and the productivity can be improved.

  Moreover, since the coupling | bond part 29 is arrange | positioned in the radial direction outer side than the centrifugal fans 16 and 17, when introducing external air, the coupling | bond part 29 does not become obstructive and introduce | transduces outside air into the cover 28 smoothly. Thus, the electronic components incorporated in the cover 28 can be efficiently cooled.

  Further, since the outside air introduction hole 28d is disposed radially inward of the centrifugal fans 16 and 17, the outside air can be smoothly introduced into the cover 28 by this, and an electronic component built in the cover 28 is also provided. Can be efficiently cooled.

Embodiment 2. FIG.
6 is a rear view showing a rotary electric machine according to Embodiment 2 of the present invention, and FIG. 7 is a sectional view taken along line VII-VII in FIG. After the cover 28 is fixed to the connecting board 27 by the coupling portion 29, the cover 28 is fastened to the boss 6 a together with the cooling heat sink 23 of the inverter assembly 2 by bolts (fasteners) 32. Further, as a countermeasure against heat withstand when the cover 28 is a resin molded product, a plate 33 is insert-molded on the cover 28. Other configurations are the same as those in the first embodiment.

  According to such a configuration, in addition to the same effect as that of the first embodiment, an effect that the cover 28 can be prevented from falling off even if the coupling portion 29 is removed is obtained.

  In addition, in Embodiment 2, although the fixing location by the volt | bolt 32 was made into one location, two or more locations may be sufficient.

Embodiment 3 FIG.
Next, FIG. 8 is a rear view showing a rotary electric machine according to Embodiment 3 of the present invention, and FIG. 9 is a sectional view taken along line IX-IX in FIG. After the cover 28 is fixed to the connecting board 27 at the coupling portion 29, it is fastened together with a nut (fastener) 36 together with a vehicle-side harness detent 35 to an output terminal portion (B terminal) 34 that penetrates the cover 28. Fixed. Other configurations are the same as those in the first embodiment.

  According to such a configuration, in addition to the same effects as in the second embodiment, the vehicle-side harness detent 35 can also be used as a cover 28 and the bolt 32 used in the second embodiment is omitted. The number of parts can be reduced and the cost can be reduced.

Note that Embodiments 2 and 3 may be combined.
In Embodiments 1 to 3, the rectangular parallelepiped cover main body 28b is shown. However, as long as at least one flat surface portion is provided, the rectangular parallelepiped shape is not necessary.
Furthermore, in Embodiments 1 to 3, the claw portion 27 a is provided on the connecting board 27, but the claw portion may be provided on another member provided on the drive unit 1.

  DESCRIPTION OF SYMBOLS 1 Drive part, 2 Inverter assembly, 3 Rotor, 4 Stator, 5 Front bracket (housing), 6 Rear bracket (housing), 16 1st centrifugal fan, 17 2nd centrifugal fan, 21 Rectifier module, 22 field Magnetic module, 25 control module, 27 connecting board (member provided in drive unit), 27a claw part, 28 cover, 28a hook, 28b cover body, 28c convex part, 28d outside air introduction hole, 32 bolt (fastener), 34 Output terminal part, 35 Vehicle side harness detent, 36 Nut (fastener).

Claims (6)

A drive unit having a rotor, a stator, and a housing for holding the rotor and the stator;
An inverter assembly fixed to the drive unit and having a plurality of electronic components; and a cover for protecting the inverter assembly,
A plurality of claw portions are provided on a member provided in the driving unit,
The cover is provided with a plurality of hooks that are hung on the claw portion,
The cover is coupled to the drive unit by hanging the hook on the claw unit,
The cover has a cover main body provided with at least one flat part on the outer periphery, and a convex part partially protruding outward from the outer periphery of the cover main body,
A plurality of curved portions are provided at the tip of the convex portion,
The hook is a rotating electrical machine provided in the curved portion. A centrifugal fan that is provided in the rotor and generates cooling air by the rotation of the rotor;
The rotating electrical machine according to claim 1, wherein the claw portion and the hook are disposed on a radially outer side than the centrifugal fan. The cover body is provided with a plurality of outside air introduction holes,
The rotating electrical machine according to claim 2, wherein the outside air introduction hole is disposed radially inward of the centrifugal fan. The outer shape of the electronic component and the outer shape of the inverter assembly are rectangular parallelepiped,
The rotating electrical machine according to any one of claims 1 to 3, wherein an outer shape of the cover main body is a rectangular parallelepiped shape that follows an outer peripheral shape of the inverter assembly.   The rotating electrical machine according to any one of claims 1 to 4, wherein the cover is fixed together with the inverter assembly together with the inverter assembly by a fastener in addition to the fixing by the hook.   The rotating electrical machine according to any one of claims 1 to 5, wherein the cover is fastened together with an output terminal portion together with a harness rotation stop by a fastener in addition to fixing by the hook.

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