WO2016171205A1

WO2016171205A1 - Outer rotor type rotating electrical machine

Info

Publication number: WO2016171205A1
Application number: PCT/JP2016/062616
Authority: WO
Inventors: 孝典松井; 美佳坂上
Original assignee: 株式会社ミツバ
Priority date: 2015-04-21
Filing date: 2016-04-21
Publication date: 2016-10-27
Also published as: CN107710559A; CN107710559B; BR112017022426A2; BR112017022426B1; JPWO2016171205A1; JP6343394B2

Abstract

An insulator includes a retaining portion with which a terminal unit provided with a neutral point terminal is retained. The terminal unit is provided with a plurality of connection terminals to which a coil wire of a rotating electrical machine is electrically connected, and which constitute the neutral point terminal, and an insulating securing member to which the connection terminal is secured. The terminal unit is accommodated in the retaining portion formed in the insulator, and the securing member is sandwiched between the insulator and the stator core.

Description

Outer rotor type rotating electrical machine

The present invention relates to an outer rotor type rotating electrical machine.
This application claims priority based on Japanese Patent Application No. 2015-087051 for which it applied on April 21, 2015, and uses the content here.

2. Description of the Related Art Conventionally, in a motorcycle, a magnet generator having a magnet is widely used as a generator for charging a battery and supplying electric power to electrical components. This type of magnet generator includes a rotor connected to a crankshaft of an engine of a motorcycle and a stator fixed to an engine case, and the stator is disposed inside the rotor. The rotor includes a substantially bowl-shaped flywheel having a plurality of magnets on the inner periphery. The stator includes a stator core around which a coil is wound. A resin insulator is attached to the stator core. The insulator is provided with a neutral point terminal of metal (for example, brass). The stator core is wound with a U-phase, V-phase, and W-phase coil on an insulator. The U-phase, V-phase, and W-phase coils are star-connected through neutral point terminals (see, for example, Patent Document 1).

JP 2010-63233 A

中 The neutral point terminal is press-fitted and fixed to the insulator. The U-phase, V-phase, and W-phase coils are connected to the neutral point terminal by solder. At this time, the insulator may be deformed by heat generated during soldering. If the insulator is deformed, the neutral point terminal may fall off from the insulator.

The purpose of the embodiment of the present invention is to prevent the neutral point terminal from falling off the insulator even when the insulator is deformed by heat generated during soldering, etc. The object is to provide a rotary electric machine.

According to the aspect of the present invention, the neutral point terminal is sandwiched between the insulator and the stator core via the fixing member. For this reason, even if the insulator is deformed by heat generated when the U-phase, V-phase, and W-phase coils are soldered to the neutral point terminal, the neutral point terminal is dropped from the insulator and the coil is disconnected. There is no.

One aspect of the present invention is an outer rotor type rotating electrical machine including a stator and a rotor that rotates around the stator.The stator includes a stator core made of a magnetic material, an insulator attached to the stator core, and The rotor includes a coil wound around a stator core via an insulator, and a terminal unit having a terminal plate to which the coil is connected. The rotor rotates around the stator, and the inner peripheral surface of the flywheel. The terminal unit has an insulating fixing member to which the terminal plate is fixed, and the insulator has a terminal unit holding portion in which a storage chamber for storing the terminal unit is formed. The terminal unit is housed in the terminal unit holding portion of the insulator, and the fixing member is formed by the insulator and the stator core. It is outer rotor type rotating electrical machine, characterized in that the lifting.

In the outer rotor type rotating electrical machine described above, the first end of the fixing member of the terminal unit may contact the wall of the storage chamber of the terminal unit holding portion of the insulator, and the second end of the fixing member of the terminal unit. May contact the side wall of the stator core.

In the outer rotor type rotating electrical machine described above, the wall portion of the storage chamber of the terminal unit holding portion of the insulator may be formed with a slit portion through which the terminal plate of the terminal unit is inserted, and protrudes from the insulator through the slit. A coil may be connected to the coil holding portion of the terminal board.

In the outer rotor type rotating electric machine described above, a terminal plate may be press-fitted and fixed to the fixing member.

In another aspect of the present invention, an outer rotor type rotating electrical machine includes a stator and a rotor. The stator includes a stator core made of a magnetic material, an insulator attached to the stator core, a coil wound around the stator core, and a terminal unit having a terminal plate to which the coil is connected. The rotor includes a flywheel arranged to rotate with respect to the stator, and a plurality of magnets fixed to the flywheel. The terminal unit has an insulating fixing member to which the terminal plate is attached. The insulator has a wall arranged to cover at least a part of the fixing member.

It is a front view of the magnet generator in the embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is the B section enlarged view of FIG. It is a perspective view of a fixing member. It is a perspective view of a neutral point terminal. It is a perspective view of a neutral point terminal unit.

A magnet generator (outer rotor type rotating electrical machine) 1 for a motorcycle according to an embodiment will be described with reference to FIGS. 1 and 2. The magnet generator 1 is used as, for example, a magnet generator in a motorcycle. The magnet generator 1 has a stator 2 that is fixed to an engine case (not shown) and a rotor 3 that is fixed to the tip of an engine crankshaft (not shown). The rotor 3 rotates around the stator 2 as the crankshaft rotates. The rotor 3 is arranged to rotate with respect to the stator 2.

The rotor 3 has a substantially bowl-shaped flywheel 31 and a boss 32 fixed at the radial center of the bottom surface of the flywheel 31. On the inner peripheral surface of the flywheel 31, a plurality of magnets 33 are arranged at equal intervals in the circumferential direction.

The boss 32 has a cylindrical tube portion 32a and a substantially disc-shaped flange portion 32b. The flange portion 32b is integrally formed with the cylindrical portion 32a. The flange portion 32 b is fastened and fixed to the bottom surface of the flywheel 31 by a plurality of rivets 100. A crankshaft (not shown) is fixed to the cylindrical portion 32 a of the boss 32.

A resin ring-shaped magnet case 34 is installed inside the bottom 31a of the flywheel 31. A magnet 33 is placed on the magnet case 34. A magnet holder 35 is placed on one end of the magnet 33. The magnet 33 is pressed against the inner peripheral surface of the flywheel 31 by bending the magnet holder 35. The magnet 33 is substantially fixed to the inner peripheral surface of the flywheel 31. The magnet holder 35 is fixed by curling the opening peripheral edge 31b of the flywheel 31.

The stator 2 has a stator core 21 and an insulator 22 attached to the stator core 21. A coil 23 is wound around the stator core 21 via an insulator 22. The stator core 21 is formed by laminating magnetic material plates at least in the axial direction. In the stator core 21, a hole (boss hole) 21e is formed in the center in the radial direction. An engine crankshaft (not shown) is inserted through the hole 21e. The crankshaft and the rotor 3 are connected to each other through a cylindrical portion 32a of the boss 32. The stator core 21 has an annular ring portion 21b and a teeth portion 21c extending radially outward from the annular portion 21b. A plurality of bolt holes 21 d are formed in the annular portion 21 b of the stator core 21. The stator 2 is fastened and fixed to the engine case by a bolt 101 inserted into the bolt hole 21d.

The insulator 22 attached to the stator core 21 has a terminal unit holding part (holding part) 22b and a storage chamber 22c. The terminal unit holding part 22b is formed with a slit part (slit) 22a. A part of the neutral point terminal unit (terminal unit) 4 is accommodated in the accommodation chamber 22c. In one example, another part of the neutral point terminal unit 4 is disposed through the slit portion 22a. For example, the neutral point terminal unit 4 is press-fitted and fixed to the terminal unit holding part 22b via the slit part 22a. Further, a part of the neutral point terminal unit 4 is disposed so as to protrude from the outer surface of the insulator 22 (protruding portion). One end of the coil 23 of each phase wound is connected to the neutral point terminal unit 4 press-fitted and fixed to the terminal unit holding portion 22b.

The coil 23 is composed of a U-phase, V-phase, and W-phase coil 23, and each phase coil 23 is wound around a tooth portion 21c. One end of the coil 23 of each phase is fixed to the coil holding portion 42b of the neutral point terminal 42 by, for example, solder, and a star connection is configured. The other end of each phase coil 23 is electrically and mechanically joined to the corresponding phase lead wire 102.

The neutral point terminal unit 4 will be described with reference to FIGS. The neutral point terminal unit 4 includes an insulating (for example, resin) fixing member 41 and a conductive neutral point terminal (terminal, terminal plate) 42. The insulator 22 has a wall portion (wall) 22 b that is arranged so as to cover at least a part of the fixing member 41. A part of the neutral point terminal unit 4 (a part of the fixing member 41 and the neutral point terminal 42) is accommodated in an accommodation chamber 22c formed in the terminal holding portion 22b of the insulator 22. The wall portion (wall) 22b is provided such that an axial gap (storage chamber 22c) is formed between the stator core 21 and the wall portion 22b. At least a part of the fixing member 41 is disposed in the gap (the storage chamber 22c). In one example, another part of the neutral point terminal unit 4 (a part of the neutral point terminal 42) is inserted into the slit part (slit) 22a and disposed through the slit part 22a. For example, the neutral point terminal unit 4 is press-fitted and fixed to the terminal unit holding portion 22b of the insulator 22 through the slit portion 22a. In one example, the fixing member 41 is L-shaped in cross-section and has a lower end (second end) 41a and a wall 41b. A plurality of protrusions 41 c are formed on the wall 41 b of the fixing member 41 at regular intervals, for example.

In one example, the neutral point terminal 42 is formed in a plate shape (for example, a substantially flat plate shape). The neutral point terminal 42 has a flat plate portion 42d and a coil holding portion 42b. A through hole 42a into which the protrusion 41c of the fixing member 41 is press-fitted is formed in the flat plate portion 42d. Side portions 42c are linearly formed on both side surfaces of the flat plate portion 42d. Since the straight side surface portion 42c is formed on both side surfaces of the flat plate portion 42d, when the neutral point terminal 42 is manufactured by press working, the side surface portion 42c and the second side surface portion 42c of the first neutral point terminal 42 are formed. The neutral point terminal 42 can be brought close to the side surface 42c, and the yield is improved.

The neutral point terminal 42 is attached (fixed) to the fixing member 41. In one example, in the neutral point terminal unit 4, the protrusion 41 c of the fixing member 41 is press-fitted into the through hole 42 a of the neutral point terminal 42, so that the neutral point terminal 42 is integrated with the fixing member 41. When the neutral point terminal unit 4 is accommodated in the accommodation chamber 22 c and press-fitted into the insulator 22, the upper end portion (first end portion) 41 d of the fixing member 41 comes into contact with the wall portion (wall) 22 b of the insulator 22. . When the insulator 22 into which the neutral point terminal unit 4 is press-fitted is attached to the stator core 21, the lower end portion 41 a of the fixing member 41 comes into contact with the annular portion 21 b of the stator core 21. In one example, after the insulator 22 is mounted on the stator core 21, the coil 23 is wound around the tooth portion 21 c of the stator core 21 via the insulator 22. The upper end portion 41 d of the fixing member 41 is in close contact with the insulator 22, and the lower end portion 41 a of the fixing member 41 is in close contact with the annular portion 21 b of the stator core 21. The neutral point terminal unit 4 is sandwiched between the insulator 22 (wall portion 22b) and the stator core 21.

Therefore, when the fixing member 41 is sandwiched between the insulator 22 and the stator core 21, the neutral point terminal 42 is held by the terminal unit holding portion 22 b of the insulator 22. At least a part of the fixing member 41 is covered with a wall portion (wall) 22 b of the insulator 22. The width W of the slit portion 22 a is narrower than the height H of the protrusion 41 c of the fixing member 41. Even when the insulator 22 is deformed by heat generated during soldering, the neutral point terminal unit 4 does not fall out of the insulator 22 through the slit portion 22a of the insulator 22.

In the above-described embodiment, the case where the insulator 22 is applied to a two-wheeled motor magnet generator has been described. However, the insulator 22 may be applied to a generator or an electric motor for other purposes.

In the embodiment, the neutral point terminal unit 4 is formed by forming the protrusion 41c and the bottom 31a on the insulating (for example, resin) fixing member 41. However, the neutral point terminal 42 may be indirectly held by the insulator 22 and is not limited to this. For example, the neutral point terminal unit 4 may be formed by insert molding the neutral point terminal 42.

DESCRIPTION OF SYMBOLS 1 Magnet generator 2 Stator 3 Rotor 4 Neutral point terminal unit 21 Stator core 21a Boss hole

21b Ring part

21c Teeth part

21d Bolt hole

21e Boss hole 22 Insulator 22a Slit part 22b Terminal unit holding part

22c Storage chamber

22d Wall part 23 coil 31 flywheel 31a bottom 31b opening peripheral edge 32 boss 33 magnet 33a upper end 34 magnet case 35 magnet holder 41 fixing member 41a lower end (second end)
41b Wall 41c Projection 41d Upper end (first end)
42 Neutral point terminal 42a Through hole 42b Coil holding part 42c Side face part 100 Rivet 101 Bolt 102 Lead wire

Claims

In an outer rotor type rotating electrical machine comprising a stator and a rotor that rotates around the stator,
The stator includes a stator core made of a magnetic material, an insulator attached to the stator core, a coil wound around the stator core via the insulator, and a terminal unit having a terminal plate to which the coil is connected. Have
The rotor has a flywheel that rotates around the stator, and a plurality of magnets fixed to the inner peripheral surface of the flywheel,
The terminal unit includes an insulating fixing member to which the terminal plate is fixed,
The insulator includes a terminal unit holding portion in which a storage chamber for storing the terminal unit is formed,
The terminal unit is housed in the terminal unit holding portion of the insulator,
The outer rotor type rotating electrical machine, wherein the fixing member is sandwiched between the insulator and the stator core.
In the outer rotor type rotating electrical machine according to claim 1,
The first end portion of the fixing member of the terminal unit is in contact with the wall portion of the storage chamber of the terminal unit holding portion of the insulator, and the second end portion of the fixing member of the terminal unit is on the side wall portion of the stator core. An outer rotor type rotating electrical machine characterized by being in contact.
In the outer rotor type rotating electrical machine according to claim 2,
The wall portion of the storage chamber of the terminal unit holding portion of the insulator is formed with a slit portion through which the terminal plate of the terminal unit is inserted, and the coil holding portion of the terminal plate protruding from the insulator through the slit The outer rotor type rotating electrical machine, wherein the coil is connected to the outer rotor type rotating electrical machine.
In the outer rotor type rotating electrical machine according to any one of claims 1 to 3,
The outer rotor type rotating electrical machine, wherein the terminal plate is press-fitted and fixed to the fixing member.
A stator,
A rotor, and
The stator includes a stator core made of a magnetic material, an insulator attached to the stator core, a coil wound around the stator core, and a terminal unit having a terminal plate to which the coil is connected,
The rotor has a flywheel arranged to rotate with respect to the stator, and a plurality of magnets fixed to the flywheel,
The terminal unit has an insulating fixing member to which the terminal plate is attached,
The insulator is an outer rotor type rotating electrical machine having a wall disposed so as to cover at least a part of the fixing member.
The wall is provided such that an axial gap is formed between the stator core and the wall;
The outer rotor type rotating electrical machine according to claim 5, wherein at least a part of the fixing member is disposed in the gap.
The outer rotor type rotating electrical machine according to claim 5 or 6, wherein the wall is disposed so as to contact the fixing member.
The outer rotor type rotating electrical machine according to any one of claims 5 to 7, wherein the wall has a slit into which the terminal plate is inserted.
The outer rotor type rotating electrical machine according to any one of claims 5 to 8, wherein the terminal plate is press-fitted and fixed to the fixing member.