WO2021014711A1 - Electric work machine and air compressor - Google Patents

Electric work machine and air compressor Download PDF

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Publication number
WO2021014711A1
WO2021014711A1 PCT/JP2020/018383 JP2020018383W WO2021014711A1 WO 2021014711 A1 WO2021014711 A1 WO 2021014711A1 JP 2020018383 W JP2020018383 W JP 2020018383W WO 2021014711 A1 WO2021014711 A1 WO 2021014711A1
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WO
WIPO (PCT)
Prior art keywords
housing
stator
rotor
core
air compressor
Prior art date
Application number
PCT/JP2020/018383
Other languages
French (fr)
Japanese (ja)
Inventor
真輝人 寺本
智弘 蜂須賀
典之 西土
圭 神田
Original Assignee
株式会社マキタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社マキタ filed Critical 株式会社マキタ
Publication of WO2021014711A1 publication Critical patent/WO2021014711A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/32—Windings characterised by the shape, form or construction of the insulation
    • H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports

Definitions

  • the present invention relates to electric work machines such as brush cutters and electric tools, and air compressors.
  • An object of the present invention is to provide an electric work machine and an air compressor having improved insulation performance.
  • the first aspect of the present invention is With a metal housing It ’s a motor, A stator that is insulated and connected to the housing and in which a coil is wound around the stator core via an insulator. A rotor that is insulated from the housing, has a magnet, and is rotatable with respect to the stator. With a motor that has It is an electric work machine having.
  • the second aspect of the present invention is With the housing A motor that is supported by the housing and double insulated from the housing. With the stator A rotor that can rotate with respect to the stator, With a motor that has A pump unit that is driven by the rotation of the rotor and It is an air compressor having.
  • the third aspect of the present invention is With the housing It ’s a motor, A stator fixed to the housing, in which a coil is wound around the stator core via an insulator, and a stator. A rotor that is rotatably supported by the housing and is located outside the stator and has a magnet. With a motor that has The winding portion of the coil in the insulator is thicker than the other portions, or the outside of the coil is molded with resin. It is an electric work machine.
  • the insulation performance is improved.
  • FIG. 1 Perspective view of the air compressor of Form 1 Horizontal cross-sectional view at the rotating shaft Sectional view taken along line AA of FIG. 2 (housing portion only) BB line sectional view of FIG.
  • Rear perspective view of rotor core Explanatory drawing of the motor part showing the insulation structure of the third form
  • Explanatory drawing of the motor part which shows the insulation structure of the 4th form
  • Explanatory drawing of the motor part which shows the insulation structure of FIG.
  • FIG. 1 is a perspective view of an air compressor which is an example of an electric working machine.
  • FIG. 2 is a horizontal cross-sectional view of the rotating shaft portion.
  • the air compressor 1 has a pair of tanks 2A and 2B, a pair of bases 3, and a main body 4.
  • the inside of the pair of tanks 2A and 2B communicate with each other.
  • the pair of bases 3 are provided on the upper side of the tanks 2A and 2B.
  • the main body 4 is supported on the base 3.
  • the tanks 2A and 2B have the same internal pressure.
  • the tanks 2A and 2B are supported parallel and horizontally by the four legs 5A to 5D provided on the lower surfaces of both ends in the longitudinal direction.
  • the main body 4 is covered with a resin cover (not shown) on the upper side of the tanks 2A and 2B.
  • the fan 48 side which will be described later, will be described as the front, the housing 6 side as the rear, and the longitudinal directions of the tanks 2A and 2B as the left-right direction.
  • the tanks 2A and 2B, the base 3, and the housing 6 are made of metal. If a current flows through the housing 6, a current also flows through the tanks 2A and 2B that are conductive with the housing 6. The tanks 2A and 2B are not covered with a cover and are exposed to the outside.
  • the main body 4 has a housing 6 and a pair of cylinders 7A and 7B.
  • the housing 6 has a tubular shape made of metal and is supported in the front-rear direction on the base 3.
  • the pair of cylinders 7A and 7B project in the left-right direction on the left and right side surfaces of the housing 6.
  • a pipe 8A is connected between the cylinder 7A and the cylinder 7B.
  • a pipe 8B is connected between the cylinder 7B and the tanks 2A and 2B.
  • a support cylinder 10 having a two-stage diameter is integrally projected from the front surface of the housing 6.
  • the support cylinder 10 has a large diameter portion 11 on the rear side and a small diameter portion 12 on the front side.
  • the motor 15 is supported on the support cylinder 10 side.
  • the motor 15 is an outer rotor type brushless motor, and has a stator 16 and a rotor 17.
  • the stator 16 is fixed to the support cylinder 10.
  • the rotor 17 is arranged outside the stator 16 and is rotatably supported by the housing 6.
  • the stator 16 has a stator core 18, a plurality of insulators 19, and a plurality of coils 20.
  • the stator core 18 is made of a magnetic material. As shown in FIG. 4, the stator core 18 has a ring-shaped base 21 and a plurality of (12 in this case) teeth 22. The plurality of teeth 22 project radially from the base 21.
  • Each insulator 19 is formed of a resin material and is fixed in a state of covering each tooth 22.
  • Each insulator 19 is integrally connected to a resin-made covering portion 23 that covers the front and rear surfaces of the base portion 21.
  • the outer ring 24 and the inner ring 25 are concentrically formed on the covering portion 23.
  • the outer ring 24 is erected inside each coil 20 longer than the coil 20 in the front-rear direction.
  • the inner ring 25 is inside the outer ring 24 and has a shorter length in the front-rear direction than the outer ring 24.
  • a sensor circuit board 37 is provided on the rear side of the stator core 18. The sensor circuit board 37 is supported via the insulator 19 and the outer ring 24.
  • the sensor circuit board 37 has an arc shape and has a rotation detection element (not shown) for detecting the magnetic field of the magnet 52 provided on the rotor 17, which will be described later.
  • the coil 20 is formed by winding a wire around each of the four teeth 22 via an insulator 19 for each of the U-phase, V-phase, and W-phase, and forms a three-phase power line (not shown). Be connected.
  • each tooth 22A is located vertically and horizontally.
  • the protruding end 22A1 of each tooth 22A is fixed to the large diameter portion 11 of the support cylinder 10 by four bolts 27 (first fastening member) from the front.
  • each bolt 27 has a metal sleeve 28 as an exterior, penetrates a washer 29 on the front side of the sleeve 28, penetrates a first through hole 26 provided in the teeth 22A, and has a large diameter portion. Screwed into 11.
  • the bolted portion is provided with a first insulating portion 30 that insulates between the stator 16 and the housing 6.
  • the first insulating portion 30 has a first cylinder member 31 and a first cover member 32.
  • the first cylinder member 31 is made of resin and is externally attached to the sleeve 28 in each of the first through holes 26.
  • the first cover member 32 is made of resin and covers the front surface side of the support cylinder 10.
  • the rear end of the first cylinder member 31 abuts on the front surface of the large diameter portion 11 and covers the entire sleeve 28.
  • the first cylinder member 31 has a flange portion 33 having a diameter larger than that of the washer 29 at the front end.
  • the flange portion 33 is interposed between the teeth 22 and the washer 29.
  • the first cylinder member 31 insulates the teeth 22A from the sleeve 28, the washer 29, and the bolt 27 (the large diameter portion 11 to which the bolt 27 is fixed).
  • the first cover member 32 has an outer cylinder portion 34 and a disk portion 35.
  • the outer cylinder portion 34 is exteriorized by the small diameter portion 12 of the support cylinder 10.
  • the disk portion 35 covers the front surface of the large diameter portion 11 and has a slightly larger diameter than the large diameter portion 11.
  • the protruding end 22A1 of each tooth 22A abuts on the outer surface of the outer cylinder portion 34, and the flange portion 33 of each first cylinder member 31 abuts in front of the protruding end 22A1.
  • Four through holes 36 are formed in the disk portion 35.
  • a first cylinder member 31 is fitted into each through hole 36.
  • the first cover member 32 insulates between the protruding end 22A1 of each tooth 22A and the support cylinder 10.
  • the rotor 17 has a rotating shaft 41 and a rotor core 42.
  • the rotating shaft 41 and the rotor core 42 are each made of a magnetic material.
  • the rotating shaft 41 is coaxially supported at the inner center of the housing 6 via a bearing 40.
  • the rotor core 42 has a cup shape and is connected to the front end of the rotating shaft 41. Both front and rear ends of the rotating shaft 41 project from the housing 6.
  • the front end of the rotating shaft 41 protrudes from the support cylinder 10, and the connecting cylinder 43 having the partition 44 inside is coaxially and integrally connected by the bolt 45.
  • a flange 46 is provided around the outer circumference of the connecting cylinder 43.
  • the rotor core 42 is assembled to the flange 46 from the front.
  • a step portion 47 having a wall thickness in the front-rear direction is provided around the front base portion of the flange 46.
  • a fan 48 is integrally screwed to the front end of the connecting cylinder 43 by a screw 49.
  • the rotor core 42 is cup-shaped and has 10 through holes 42a on the front surface at equal intervals in the circumferential direction.
  • the rotor core 42 is connected to the flange 46 of the connecting cylinder 43 by three bolts 50 (second fastening member) from the front.
  • the rotor core 42 has a peripheral wall portion 51 that overlaps the outside of the stator core 18 in the radial direction.
  • a cylindrical magnet 52 is arranged on the inner circumference of the peripheral wall portion 51 located on the outside of each tooth 22. The magnet 52 is magnetized so that the north and south poles appear alternately.
  • Each bolt 50 that connects the rotor core 42 to the connecting cylinder 43 penetrates the sleeve 53 and the washer 54, penetrates the second through hole 55 provided in the rotor core 42, and is screwed into the flange 46 of the connecting cylinder 43.
  • the bolted portion is also provided with a second insulating portion 60 that insulates between the rotor core 42 and the connecting cylinder 43.
  • the second insulating portion 60 has a second cylinder member 61 and a second cover member 62.
  • the second cylinder member 61 is made of resin, and is externally attached to the sleeve 53 in each of the second through holes 55.
  • the second cover member 62 is made of resin and covers the front surface side of the connecting cylinder 43.
  • the rear end of the second cylinder member 61 abuts on the front surface of the flange 46 and covers the entire sleeve 53.
  • the second tubular member 61 has a flange portion 63 having a diameter larger than that of the washer 54 at the front end.
  • the flange portion 63 is interposed between the rotor core 42 and the washer 54.
  • the second cylinder member 61 insulates the rotor core 42 from the sleeve 53 and the washer 54.
  • the second cover member 62 has an outer cylinder portion 64 and a disk portion 65.
  • the outer cylinder portion 64 is exteriorized by the step portion 47 of the connecting cylinder 43.
  • the disk portion 65 covers the front surface of the flange 46 and has a diameter slightly larger than that of the flange 46.
  • the inner peripheral edge of the rotor core 42 abuts on the outer surface of the outer cylinder portion 64, and the flange portion 63 of the second cylinder member 61 abuts in front of the rotor core 42.
  • Three through holes 66 are formed in the disk portion 65.
  • a second cylinder member 61 is fitted into each through hole 66.
  • the second cover member 62 insulates between the connecting cylinder 43, the rotating shaft 41, the metal member conducting with the bearing 40, and the rotor core 42.
  • a pair of front and rear cams 70 are integrally fixed to the rotating shaft 41 in the housing 6.
  • the pair of cams 70 are eccentric with a phase shift of 180 ° around the axis of the rotating shaft 41.
  • a cam ring 72 is attached to each cam 70 via a bearing 71.
  • the cam ring 72 is pin-coupled to the piston 74 housed in the cylinders 7A and 7B via the connecting rod 73. Therefore, when the rotating shaft 41 rotates, each cam 70 and the connecting rod 73 convert the rotational motion into the reciprocating motion of the piston 74, and the piston 74 reciprocates at the timing opposite to each other by the cam 70.
  • the pump portion 76 that alternately compresses the air in the cylinder chambers 75 formed in both cylinders 7A and 7B by the reciprocating motion of the piston 74 and supplies the compressed air to the tanks 2A and 2B. Is formed. Specifically, first, the outside air pressure is compressed in the cylinder chamber 75 on the cylinder 7A side. The compressed air is sent to the cylinder chamber 75 on the cylinder 7B side via the pipe 8A and further compressed. The compressed air is sent to the tanks 2A and 2B via the pipe 8B.
  • the air compressor 1 of the present embodiment when the start switch (not shown) is turned on, power is supplied to each coil 20 of the stator 16 and the rotor 17 rotates.
  • the controller control circuit (not shown) obtains a rotation detection signal indicating the position of the rotor 17 magnet 52 output from the rotation detection element of the sensor circuit board 37 to acquire the rotation state of the rotor 17. Then, ON / OFF of each FET of the control circuit is controlled according to the acquired rotation state, and the three-phase coils 20 are sequentially energized to rotate the rotor 17.
  • the rotating shaft 41 also rotates integrally, so that each pump unit 76 is driven and compressed air compressed in two stages is supplied to the tanks 2A and 2B.
  • the compressed air stored in the tanks 2A and 2B can be supplied to the outside via a hose connected to a coupler (not shown).
  • the insulator 19 insulates (basic insulation) between the coil 20 and the stator core 18. Further, the first insulating portion 30 insulates (additional insulation) between the stator 16 and the housing 6, and the second insulating portion 60 insulates (additionally insulates) between the rotor 17 and the housing 6. It has a double insulation structure. Therefore, even if the current flows to the stator core 18, the current does not flow to the housing 6. Further, even if a current flows from the stator core 18 to the rotor 17, it is possible to prevent the current from flowing from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
  • the air compressor 1 of the first embodiment has a stator 16 in which the coil 20 is wound around the stator core 18 via the insulator 19, and a magnet 52 (magnet) that is rotatable with respect to the stator 16. It has a motor 15 including a rotor 17 and a metal housing 6 to which the stator 16 is connected and rotatably supports the rotor 17, and the stator 16 and the rotor 17 are respectively insulated from the housing 6. There is. That is, a double insulation structure is formed by the basic insulation by the insulator 19 interposed between the stator core 18 and the coil 20 and the additional insulation in which the stator 16 and the rotor 17 are respectively insulated from the housing 6. Performance is improved.
  • stator 16 is fixed by fastening the stator core 18 to the housing 6 with bolts 27 (first fastening member). Since the first insulating portion 30 between the stator core 18 and the housing 6 is formed at the fastening portion to insulate the housing 6 and the stator 16, insulation using the fastening portion can be easily performed.
  • the rotor 17 has a rotating shaft 41 supported by the housing 6, and the rotor core 42 supporting the magnet 52 is fastened to the connecting cylinder 43 integrated with the rotating shaft 41 with bolts 50 (second fastening member). It is fixed to the rotating shaft 41.
  • the insulation at the fastening portion is provided by the tubular first and second tubular members 31, 61 (first resin member) exteriored by the bolts 27 and 50, and the housing 6 and the stator core 18 or the rotor core 42. Since it is performed by the first and second cover members 32 and 62 (second resin member) interposed between them, insulation using both members can be surely performed.
  • the stator 16 is fixed to the housing 6 with bolts 27 (first fastening member) and the first insulating portion 30 is arranged between the bolts 27 and the stator 16, the fastening points by the bolts 27 are used.
  • the first additional insulation can be easily performed.
  • the rotor 17 has a rotor core 42 that is indirectly fixed to the rotating shaft 41 by a bolt 50 (second fastening member), and the second insulating portion 60 is located between the bolt 50 and the rotor core 42. Since it is arranged, the second additional insulation using the fastening portion by the bolt 50 can be easily performed.
  • the second insulating portion is not provided between the connecting cylinder 43 and the rotor core 42, and is directly connected by the bolt 50 and the washer 54.
  • the resin layer 80 and the second resin layer 81 form the second insulating portion 60.
  • the resin layer 80 is formed over the inner peripheral surface, the front surface, and the rear surface of the magnet 52 in the peripheral wall portion 51.
  • the second resin layer 81 is continuous with the resin layer 80 and covers the entire back surface of the rotor core 42.
  • the first insulating portion 30 is the same as the first insulating portion 30.
  • the stator core is provided between the stator 16 and the housing 6 by the first insulating portion 30 and by the second insulating portion 60. Since the space between the 18 and the rotor 17 is insulated (additional insulation), a double insulation structure is formed. Therefore, the current does not flow to the housing 6 via the stator core 18. Since no current flows through the rotor 17 in the first place, naturally no current flows from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41.
  • the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
  • the resin layer 80 of the second insulating portion 60 (second additional insulation) is arranged between the stator core 18 and the magnet 52, the additional insulation structure is compared with the first form in which the fastening portion by the bolt is used. Simplifies.
  • the second resin layer 81 may be eliminated as long as the distance (insulation distance) in the front-rear direction between the coil 20 and the rotor core 42 can be secured. Further, instead of the second resin layer 81, at least the front surface side (rotor core 42 side) of the coil 20 may be coated with resin. Further, the resin layer 80 may be provided not on the outer peripheral surface of the magnet 52 but on the outer peripheral surface of the stator core 18 (at least the outer peripheral surface of each tooth 22 facing the magnet 52).
  • the second insulating portion is not provided between the connecting cylinder 43 and the rotor core 42, and the second insulating portion 60 is formed by the resin layer 80 and the second resin layer 81.
  • the resin layer 80 is formed over the outer peripheral surface, the front surface, and the rear surface of the magnet 52 on the peripheral wall portion 51.
  • the second resin layer 81 is continuous with the resin layer 80 and covers the entire back surface of the rotor core 42.
  • the first insulating portion 30 is the same as the first insulating portion 30.
  • the rotor core in the motor 15, in addition to the insulation (basic insulation) between the coil 20 and the stator core 18 by the insulator 19, the rotor core is between the stator 16 and the housing 6 by the first insulating portion 30 and the rotor core by the second insulating portion 60. Since the area between the 42 and the magnet 52 is insulated (additional insulation), a double insulation structure is formed. Therefore, the current does not flow to the housing 6 via the stator core 18. Since no current flows through the rotor 17 in the first place, no current flows from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41.
  • the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
  • the resin layer 80 of the second insulating portion 60 is arranged between the rotor core 42 and the magnet 52, the additional insulating structure is simplified as compared with the first embodiment in which the fastening portion with bolts is used.
  • the second resin layer 81 may be eliminated as long as the distance (insulation distance) in the front-rear direction between the coil 20 and the rotor core 42 can be secured.
  • the magnet 52 since the magnet 52 is separated from the peripheral wall portion 51, it is assumed that a magnetic circuit having a required capacity cannot be constructed with the ferrite magnet. In that case, it is advisable to adopt a magnet that can construct a magnetic circuit by itself, such as a bond magnet.
  • FIG. 9 shows that the first insulating portion 30 is different from the first insulating portion 30 in that the first cylinder member 31 and the first cover member 32 are integrated and are also integrated with the covering portion 23. That is, the front end of the first cylinder member 31 is connected to the first cover member 32. Further, the flange portion 33 of the first cylinder member 31 is connected to the inner ring 25 and the outer cylinder portion 34 of the first cover member 32, and the disc portion 35 of the first cover member 32 is connected to the inner ring 25, so that the stator core 18 is connected. And resin are integrally formed. Further, the second insulating portion 60 is also different from the first in that the second cylinder member 61 and the second cover member 62 of the first embodiment are integrated.
  • the rear end of the second cylinder member 61 is connected to the second cover member 62, and the flange portion 63 of the second cylinder member 61 is connected to the outer cylinder portion 64 of the second cover member 62 to be integrally formed with the rotor core 42.
  • the rotor in addition to the insulation (basic insulation) between the coil 20 and the stator core 18 by the insulator 19, the rotor is provided between the stator 16 and the housing 6 by the first insulating portion 30 and the rotor by the second insulating portion 60. Since the 17 is insulated (additional insulation) between the connecting cylinder 43, the rotating shaft 41, and the housing 6 via the bearing 40, a double insulation structure is formed. Therefore, the current does not flow from the stator core 18 to the housing 6 via the support cylinder 10 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41.
  • the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
  • the first insulating portion 30 is integrally formed with the stator core 18 and the second insulating portion 60 is also integrally formed with the rotor core 42 and contains resin, the number of parts is reduced and the labor for assembly is reduced.
  • the insulating portion may be integrated not with both the first and second insulating portions but with only one of them.
  • the integrated structure is not limited to the above form and can be changed as appropriate.
  • the second cover member 62A is formed long so as to cover the outer peripheral surface of the flange 46 of the connecting cylinder 43 and the front surface of the stepped portion 47, and the rotor core 42 and the connecting cylinder 43 are formed. It differs from Form 4 in that it is insulated between the two. That is, the rotor core 42 and the connecting cylinder 43 are integrally molded with resin by the second cover member 62A.
  • the first insulating portion 30 is the same as that of the fourth form.
  • the rotor in addition to the insulation (basic insulation) between the coil 20 and the stator core 18 by the insulator 19, the rotor is provided between the stator 16 and the housing 6 by the first insulating portion 30 and the rotor by the second insulating portion 60. Since the 17 is insulated (additional insulation) between the connecting cylinder 43, the rotating shaft 41, and the housing 6 via the bearing 40, a double insulation structure is formed. Therefore, the current does not flow to the housing 6 via the stator core 18 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
  • FIG. 11 shows an example thereof.
  • the stator core 18 and the rotor core 42 are directly fixed to the large diameter portion 11 and the flange 46 by bolts 27 and 50, respectively, and the first and second insulating portions are not provided.
  • the insulator 19A is formed so that the wall thickness at the winding portion of the coil 20 is larger than that of the insulator 19 and the covering portion 23 of the previous form, and the teeth 22 and the coil 20 are insulated from each other. Increase the distance.
  • the insulator 19A which is the winding portion of the coil 20, is made thicker than the covering portion 23, which is the other portion, so that the coil 20 and the stator core 18 are insulated (basic insulation). Is reinforced and the motor 15 is reinforced and insulated from the housing 6. Therefore, the current does not flow to the housing 6 via the stator core 18 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
  • a resin layer may be formed on the back surface of the rotor core 42.
  • stator core 18 and the rotor core 42 are directly fixed to the large diameter portion 11 and the flange 46 by bolts 27 and 50, respectively, and the first and second insulating portions are not provided.
  • stator core 18 each coil 20 is molded with a resin, and a mold layer 82 in contact with the insulator 19 is formed on the outside of each coil 20 to increase the insulation distance between each tooth 22 and the coil 20.
  • the insulation (basic insulation) between the coil 20 and the stator core 18 is strengthened, and the motor 15 is strengthened and insulated from the housing 6. Will be done. Therefore, the current does not flow to the housing 6 via the stator core 18 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
  • the reinforced insulation of Forms 6 and 7 may be performed at the same time. According to this, the insulation performance is further improved.
  • the number of teeth and the number and arrangement of bolts can be changed as appropriate, and the position of the motor with respect to the housing is not limited to the front surface.
  • the portion to be insulated is not limited to the portion to be fastened with bolts or screws, and additional insulation can be applied to the base portion of the support cylinder in the housing, the front portion of the housing beyond the bearing, and the like.
  • the rotor core is bolted to a separate connecting cylinder connected to the rotating shaft, but the rotor core may be bolted to a connecting cylinder formed integrally with the rotating shaft.
  • the applicable motor is not limited to the outer rotor type, but may be an inner rotor type, or may be a sensorless type that detects the position of the rotor by induced power without using a rotation detection element. Further, a motor with a brush may be used instead of the brushless motor.
  • the present invention is applicable not only to an air compressor but also to a mower, a chainsaw, a blower, a dust collector, and an electric tool such as a drill, a driver, or a circular saw. The present invention is useful when these electric working machines have a metal housing or a portion conductive to the housing that may be touched by a person.

Abstract

Provided is an air compressor having improved insulation performance. The air compressor 1 has: a metal housing 6; and a motor 15 that has a stator 16 connected to the housing 6 in an insulated manner, a coil 20 being wound on a stator core 18 with an insulator 19 interposed therebetween, and a rotor 17 that is insulated from the housing 6, the rotor 17 having a magnet 52 and being capable of rotating in relation to the stator 16.

Description

電動作業機及びエアコンプレッサElectric work machine and air compressor
　本発明は、刈払機、電動工具等の電動作業機及びエアコンプレッサに関する。 The present invention relates to electric work machines such as brush cutters and electric tools, and air compressors.
　エアコンプレッサや電動工具等の電動作業機においては、駆動源として、コンパクトでも高い出力が得られ、耐久性にも優れるブラシレスモータが用いられる場合が多い。例えば、特開２０１６－９３１３２号公報には、ティースを放射状に突出させたステータコアの各ティースに、インシュレータを介してコイルを巻回してなるステータと、ステータの外側で内周面に円筒形状のマグネットを固定したロータコアに、ファン及びモータ軸を固定してなるロータとを有するアウタロータ型のブラシレスモータを用いた刈払機が開示されている。 In electric work machines such as air compressors and electric tools, brushless motors, which are compact but have high output and are also excellent in durability, are often used as drive sources. For example, Japanese Patent Application Laid-Open No. 2016-93132 describes a stator in which a coil is wound around each tooth of a stator core in which teeth are radially projected via an insulator, and a cylindrical magnet on the inner peripheral surface of the outside of the stator. A brush cutter using an outer rotor type brushless motor having a fan and a rotor having a motor shaft fixed to a rotor core having a fixed motor shaft is disclosed.
　従来の電動作業機では、モータにおいてステータコアとコイルとの間をインシュレータで絶縁するにとどまっていた。 In the conventional electric work machine, in the motor, the insulator between the stator core and the coil was only insulated.
　本発明は、絶縁性能を高めた電動作業機及びエアコンプレッサを提供することを目的とする。 An object of the present invention is to provide an electric work machine and an air compressor having improved insulation performance.
　本発明の第１の観点は、
　金属製のハウジングと、
　モータであって、
　　前記ハウジングに対して絶縁して接続されるステータであって、ステータコアにインシュレータを介してコイルが巻回されるステータと、
　　前記ハウジングに対して絶縁されるロータであって、磁石を有し、前記ステータに対して回転可能なロータと、
　を有するモータと、
　を有する電動作業機である。 The first aspect of the present invention is
With a metal housing
It ’s a motor,
A stator that is insulated and connected to the housing and in which a coil is wound around the stator core via an insulator.
A rotor that is insulated from the housing, has a magnet, and is rotatable with respect to the stator.
With a motor that has
It is an electric work machine having.
　本発明の第２の観点は、
　ハウジングと、
　前記ハウジングによって支持され、前記ハウジングに対して二重絶縁されるモータであって、
　　ステータと、
　　前記ステータに対して回転可能なロータと、
　を有するモータと、
　前記ロータの回転に伴い駆動するポンプ部と、
　を有するエアコンプレッサである。 The second aspect of the present invention is
With the housing
A motor that is supported by the housing and double insulated from the housing.
With the stator
A rotor that can rotate with respect to the stator,
With a motor that has
A pump unit that is driven by the rotation of the rotor and
It is an air compressor having.
　本発明の第３の観点は、
　ハウジングと、
　モータであって、
　　前記ハウジングに固定されるステータであって、ステータコアにインシュレータを介してコイルが巻回されるステータと、
　　前記ハウジングに回転可能に支持されるロータであって、前記ステータの外側に配置され、磁石を有するロータと、
　を有するモータと、
　前記インシュレータにおける前記コイルの巻回部分は、他の部分よりも肉厚である、または、前記コイルの外側を樹脂でモールドされる、
　電動作業機である。 The third aspect of the present invention is
With the housing
It ’s a motor,
A stator fixed to the housing, in which a coil is wound around the stator core via an insulator, and a stator.
A rotor that is rotatably supported by the housing and is located outside the stator and has a magnet.
With a motor that has
The winding portion of the coil in the insulator is thicker than the other portions, or the outside of the coil is molded with resin.
It is an electric work machine.
　本発明の電動作業機及びエアコンプレッサによれば、絶縁性能が高まる。 According to the electric work machine and the air compressor of the present invention, the insulation performance is improved.
形態１のエアコンプレッサの斜視図Perspective view of the air compressor of Form 1 回転軸部分での水平断面図Horizontal cross-sectional view at the rotating shaft 図２のＡ－Ａ線断面図（ハウジング部分のみ）Sectional view taken along line AA of FIG. 2 (housing portion only) 図３のＢ－Ｂ線断面図BB line sectional view of FIG. ブラシレスモータの分解斜視図An exploded perspective view of a brushless motor 形態２の絶縁構造を示すモータ部分の説明図Explanatory drawing of the motor part which shows the insulation structure of the 2nd form ロータコアの背面斜視図Rear perspective view of rotor core 形態３の絶縁構造を示すモータ部分の説明図Explanatory drawing of the motor part showing the insulation structure of the third form 形態４の絶縁構造を示すモータ部分の説明図Explanatory drawing of the motor part which shows the insulation structure of the 4th form 形態５の絶縁構造を示すモータ部分の説明図Explanatory drawing of the motor part which shows the insulation structure of FIG. 形態６の絶縁構造を示すモータ部分の説明図Explanatory drawing of the motor part which shows the insulation structure of FIG. 形態７の絶縁構造を示すモータ部分の説明図Explanatory drawing of the motor part which shows the insulation structure of the 7th form
　以下、本発明の実施形態を図面に基づいて説明する。
［形態１］
　図１は、電動作業機の一例であるエアコンプレッサの斜視図である。図２は、回転軸部分での水平断面図である。
　エアコンプレッサ１は、一対のタンク２Ａ，２Ｂと、一対の基台３と、本体部４とを有する。一対のタンク２Ａ，２Ｂは、内部が互いに連通する。一対の基台３は、タンク２Ａ，２Ｂの上側に設けられる。本体部４は、基台３上に支持される。タンク２Ａ，２Ｂは、内圧が同じである。タンク２Ａ，２Ｂは、長手方向の両端下面に設けた４つの脚部５Ａ～５Ｄによって、互いに平行且つ水平に支持される。本体部４は、タンク２Ａ，２Ｂの上側で樹脂製のカバー（不図示）によって覆われる。
　なお、エアコンプレッサ１では、後述するファン４８側を前、ハウジング６側を後、タンク２Ａ，２Ｂの長手方向を左右方向として説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
FIG. 1 is a perspective view of an air compressor which is an example of an electric working machine. FIG. 2 is a horizontal cross-sectional view of the rotating shaft portion.
The air compressor 1 has a pair of tanks 2A and 2B, a pair of bases 3, and a main body 4. The inside of the pair of tanks 2A and 2B communicate with each other. The pair of bases 3 are provided on the upper side of the tanks 2A and 2B. The main body 4 is supported on the base 3. The tanks 2A and 2B have the same internal pressure. The tanks 2A and 2B are supported parallel and horizontally by the four legs 5A to 5D provided on the lower surfaces of both ends in the longitudinal direction. The main body 4 is covered with a resin cover (not shown) on the upper side of the tanks 2A and 2B.
In the air compressor 1, the fan 48 side, which will be described later, will be described as the front, the housing 6 side as the rear, and the longitudinal directions of the tanks 2A and 2B as the left-right direction.
　タンク２Ａ，２Ｂと、基台３と、ハウジング６は、金属製である。仮にハウジング６に電流が流れると、ハウジング６と導通するタンク２Ａ，２Ｂにも電流が流れる。タンク２Ａ，２Ｂはカバーに覆われておらず、外部に露出する。
　本体部４は、ハウジング６と、一対のシリンダ７Ａ，７Ｂとを有する。ハウジング６は、金属製の筒状であり、基台３上で前後方向に支持される。一対のシリンダ７Ａ，７Ｂは、ハウジング６の左右の側面で、それぞれ左右方向へ突出する。シリンダ７Ａとシリンダ７Ｂとの間には、配管８Ａが接続される。シリンダ７Ｂとタンク２Ａ，２Ｂとの間には、配管８Ｂが接続される。 The tanks 2A and 2B, the base 3, and the housing 6 are made of metal. If a current flows through the housing 6, a current also flows through the tanks 2A and 2B that are conductive with the housing 6. The tanks 2A and 2B are not covered with a cover and are exposed to the outside.
The main body 4 has a housing 6 and a pair of cylinders 7A and 7B. The housing 6 has a tubular shape made of metal and is supported in the front-rear direction on the base 3. The pair of cylinders 7A and 7B project in the left-right direction on the left and right side surfaces of the housing 6. A pipe 8A is connected between the cylinder 7A and the cylinder 7B. A pipe 8B is connected between the cylinder 7B and the tanks 2A and 2B.
　ハウジング６の前面には、図３にも示すように、２段径の支持筒１０が一体に突設される。支持筒１０は、後側の大径部１１と、前側の小径部１２とを有する。支持筒１０側に、モータ１５が支持される。
　モータ１５は、アウタロータ型のブラシレスモータであり、ステータ１６と、ロータ１７とを有する。ステータ１６は、支持筒１０に固定される。ロータ１７は、ステータ１６の外側に配置されて、ハウジング６へ回転可能に支持される。 As shown in FIG. 3, a support cylinder 10 having a two-stage diameter is integrally projected from the front surface of the housing 6. The support cylinder 10 has a large diameter portion 11 on the rear side and a small diameter portion 12 on the front side. The motor 15 is supported on the support cylinder 10 side.
The motor 15 is an outer rotor type brushless motor, and has a stator 16 and a rotor 17. The stator 16 is fixed to the support cylinder 10. The rotor 17 is arranged outside the stator 16 and is rotatably supported by the housing 6.
　ステータ１６は、ステータコア１８と、複数のインシュレータ１９と、複数のコイル２０とを有する。
　ステータコア１８は、磁性材料で形成される。図４に示すように、ステータコア１８は、リング状の基部２１と、複数（ここでは１２個）のティース２２とを有する。複数のティース２２は、基部２１から放射状に突設される。 The stator 16 has a stator core 18, a plurality of insulators 19, and a plurality of coils 20.
The stator core 18 is made of a magnetic material. As shown in FIG. 4, the stator core 18 has a ring-shaped base 21 and a plurality of (12 in this case) teeth 22. The plurality of teeth 22 project radially from the base 21.
　各インシュレータ１９は、樹脂材料で形成され、各ティース２２を被覆した状態で固定される。各インシュレータ１９は、基部２１の前後面を覆う樹脂製の被覆部２３とそれぞれ一体的に繋がっている。被覆部２３には、外リング２４と、内リング２５とが同心円上に形成される。外リング２４は、各コイル２０の内側で、コイル２０よりも前後に長く立設される。内リング２５は、外リング２４の内側で、外リング２４よりも前後方向の長さが短い。ステータコア１８の後側には、センサ回路基板３７が設けられる。センサ回路基板３７は、インシュレータ１９及び外リング２４を介して支持される。センサ回路基板３７は、円弧状であり、ロータ１７に設けた後述するマグネット５２の磁界を検出する回転検出素子（不図示）を有する。
　コイル２０は、Ｕ相、Ｖ相、Ｗ相の各相が、それぞれ４つのティース２２にインシュレータ１９を介してそれぞれワイヤを巻回することで形成されて、三相の電源線（不図示）と接続される。 Each insulator 19 is formed of a resin material and is fixed in a state of covering each tooth 22. Each insulator 19 is integrally connected to a resin-made covering portion 23 that covers the front and rear surfaces of the base portion 21. The outer ring 24 and the inner ring 25 are concentrically formed on the covering portion 23. The outer ring 24 is erected inside each coil 20 longer than the coil 20 in the front-rear direction. The inner ring 25 is inside the outer ring 24 and has a shorter length in the front-rear direction than the outer ring 24. A sensor circuit board 37 is provided on the rear side of the stator core 18. The sensor circuit board 37 is supported via the insulator 19 and the outer ring 24. The sensor circuit board 37 has an arc shape and has a rotation detection element (not shown) for detecting the magnetic field of the magnet 52 provided on the rotor 17, which will be described later.
The coil 20 is formed by winding a wire around each of the four teeth 22 via an insulator 19 for each of the U-phase, V-phase, and W-phase, and forms a three-phase power line (not shown). Be connected.
　ステータコア１８では、１２個のティース２２のうち、周方向に等間隔となる４つのティース２２（以下、区別する際は「ティース２２Ａ」と表記する。）が、基部２１よりも中心側に突出する。図４では、各ティース２２Ａは、上下左右にそれぞれ位置する。各ティース２２Ａの突出端２２Ａ１は、支持筒１０の大径部１１に、前方から４本のボルト２７（第１締結部材）によってそれぞれ固定される。各ボルト２７は、図５にも示すように、金属製のスリーブ２８を外装させ、スリーブ２８の前側でワッシャ２９を貫通し、ティース２２Ａに設けた第１貫通孔２６を貫通して大径部１１にねじ込まれる。 In the stator core 18, of the 12 teeth 22, four teeth 22 (hereinafter, referred to as “teeth 22A” when distinguished) that are evenly spaced in the circumferential direction project toward the center from the base 21. .. In FIG. 4, each tooth 22A is located vertically and horizontally. The protruding end 22A1 of each tooth 22A is fixed to the large diameter portion 11 of the support cylinder 10 by four bolts 27 (first fastening member) from the front. As shown in FIG. 5, each bolt 27 has a metal sleeve 28 as an exterior, penetrates a washer 29 on the front side of the sleeve 28, penetrates a first through hole 26 provided in the teeth 22A, and has a large diameter portion. Screwed into 11.
　このボルト止め部分には、ステータ１６とハウジング６との間を絶縁する第１絶縁部３０が設けられる。
　第１絶縁部３０は、第１筒部材３１と、第１カバー部材３２とを有する。第１筒部材３１は、樹脂製であり、各第１貫通孔２６内でスリーブ２８にそれぞれ外装される。第１カバー部材３２は、樹脂製であり、支持筒１０の前面側を覆う。 The bolted portion is provided with a first insulating portion 30 that insulates between the stator 16 and the housing 6.
The first insulating portion 30 has a first cylinder member 31 and a first cover member 32. The first cylinder member 31 is made of resin and is externally attached to the sleeve 28 in each of the first through holes 26. The first cover member 32 is made of resin and covers the front surface side of the support cylinder 10.
　第１筒部材３１の後端は、大径部１１の前面に当接し、スリーブ２８の全体を覆う。第１筒部材３１は、前端に、ワッシャ２９よりも大径のフランジ部３３を有する。フランジ部３３は、ティース２２とワッシャ２９との間に介在される。第１筒部材３１により、ティース２２Ａと、スリーブ２８及びワッシャ２９及びボルト２７（ボルト２７が固定される大径部１１）との間が絶縁される。 The rear end of the first cylinder member 31 abuts on the front surface of the large diameter portion 11 and covers the entire sleeve 28. The first cylinder member 31 has a flange portion 33 having a diameter larger than that of the washer 29 at the front end. The flange portion 33 is interposed between the teeth 22 and the washer 29. The first cylinder member 31 insulates the teeth 22A from the sleeve 28, the washer 29, and the bolt 27 (the large diameter portion 11 to which the bolt 27 is fixed).
　第１カバー部材３２は、外筒部３４と、円板部３５とを有する。外筒部３４は、支持筒１０の小径部１２に外装される。円板部３５は、大径部１１の前面を覆い、大径部１１よりもやや大径である。外筒部３４の外面には、各ティース２２Ａの突出端２２Ａ１が当接すると共に、突出端２２Ａ１の前方で各第１筒部材３１のフランジ部３３が当接する。円板部３５には、４つの透孔３６が形成される。各透孔３６には、第１筒部材３１がそれぞれ嵌合する。第１カバー部材３２により、各ティース２２Ａの突出端２２Ａ１と支持筒１０との間が絶縁される。 The first cover member 32 has an outer cylinder portion 34 and a disk portion 35. The outer cylinder portion 34 is exteriorized by the small diameter portion 12 of the support cylinder 10. The disk portion 35 covers the front surface of the large diameter portion 11 and has a slightly larger diameter than the large diameter portion 11. The protruding end 22A1 of each tooth 22A abuts on the outer surface of the outer cylinder portion 34, and the flange portion 33 of each first cylinder member 31 abuts in front of the protruding end 22A1. Four through holes 36 are formed in the disk portion 35. A first cylinder member 31 is fitted into each through hole 36. The first cover member 32 insulates between the protruding end 22A1 of each tooth 22A and the support cylinder 10.
　ロータ１７は、回転軸４１と、ロータコア４２とを有する。回転軸４１とロータコア４２は、それぞれ磁性材料で形成される。回転軸４１は、ハウジング６の内部中心で軸受４０を介して同軸で支持される。ロータコア４２は、カップ状であり、回転軸４１の前端に連結される。
　回転軸４１の前後両端は、ハウジング６から突出する。回転軸４１の前端は、支持筒１０から突出し、内部に仕切り４４を有する連結筒４３がボルト４５によって同軸で一体に連結される。連結筒４３の外周には、フランジ４６が周設される。フランジ４６には、前方からロータコア４２が組み付けられる。フランジ４６の前面付け根部分には、前後方向に肉厚となる段部４７が周設される。連結筒４３の前端には、ファン４８がネジ４９により一体にネジ止めされる。 The rotor 17 has a rotating shaft 41 and a rotor core 42. The rotating shaft 41 and the rotor core 42 are each made of a magnetic material. The rotating shaft 41 is coaxially supported at the inner center of the housing 6 via a bearing 40. The rotor core 42 has a cup shape and is connected to the front end of the rotating shaft 41.
Both front and rear ends of the rotating shaft 41 project from the housing 6. The front end of the rotating shaft 41 protrudes from the support cylinder 10, and the connecting cylinder 43 having the partition 44 inside is coaxially and integrally connected by the bolt 45. A flange 46 is provided around the outer circumference of the connecting cylinder 43. The rotor core 42 is assembled to the flange 46 from the front. A step portion 47 having a wall thickness in the front-rear direction is provided around the front base portion of the flange 46. A fan 48 is integrally screwed to the front end of the connecting cylinder 43 by a screw 49.
　ロータコア４２は、カップ状であり、周方向へ等間隔に１０個の透孔４２ａを前面に有する。ロータコア４２は、連結筒４３のフランジ４６に、前方から３本のボルト５０（第２締結部材）により連結される。ロータコア４２は、ステータコア１８の外側に半径方向でオーバーラップする周壁部５１を有する。各ティース２２の外側に位置する周壁部５１の内周には、円筒状のマグネット５２が配置される。マグネット５２は、Ｎ極とＳ極とが交互に表れるように着磁される。 The rotor core 42 is cup-shaped and has 10 through holes 42a on the front surface at equal intervals in the circumferential direction. The rotor core 42 is connected to the flange 46 of the connecting cylinder 43 by three bolts 50 (second fastening member) from the front. The rotor core 42 has a peripheral wall portion 51 that overlaps the outside of the stator core 18 in the radial direction. A cylindrical magnet 52 is arranged on the inner circumference of the peripheral wall portion 51 located on the outside of each tooth 22. The magnet 52 is magnetized so that the north and south poles appear alternately.
　ロータコア４２を連結筒４３に連結する各ボルト５０は、スリーブ５３及びワッシャ５４を貫通し、ロータコア４２に設けた第２貫通孔５５を貫通して、連結筒４３のフランジ４６にねじ込まれる。
　このボルト止め部分にも、ロータコア４２と連結筒４３との間を絶縁する第２絶縁部６０が設けられる。
　第２絶縁部６０は、第２筒部材６１と、第２カバー部材６２とを有する。第２筒部材６１は、樹脂製であり、各第２貫通孔５５内でスリーブ５３にそれぞれ外装される。第２カバー部材６２は、樹脂製であり、連結筒４３の前面側を覆う。 Each bolt 50 that connects the rotor core 42 to the connecting cylinder 43 penetrates the sleeve 53 and the washer 54, penetrates the second through hole 55 provided in the rotor core 42, and is screwed into the flange 46 of the connecting cylinder 43.
The bolted portion is also provided with a second insulating portion 60 that insulates between the rotor core 42 and the connecting cylinder 43.
The second insulating portion 60 has a second cylinder member 61 and a second cover member 62. The second cylinder member 61 is made of resin, and is externally attached to the sleeve 53 in each of the second through holes 55. The second cover member 62 is made of resin and covers the front surface side of the connecting cylinder 43.
　第２筒部材６１の後端は、フランジ４６の前面に当接し、スリーブ５３の全体を覆う。第２筒部材６１は、前端に、ワッシャ５４よりも大径のフランジ部６３を有する。フランジ部６３は、ロータコア４２とワッシャ５４との間に介在される。第２筒部材６１により、ロータコア４２と、スリーブ５３及びワッシャ５４との間が絶縁される。 The rear end of the second cylinder member 61 abuts on the front surface of the flange 46 and covers the entire sleeve 53. The second tubular member 61 has a flange portion 63 having a diameter larger than that of the washer 54 at the front end. The flange portion 63 is interposed between the rotor core 42 and the washer 54. The second cylinder member 61 insulates the rotor core 42 from the sleeve 53 and the washer 54.
　第２カバー部材６２は、外筒部６４と、円板部６５とを有する。外筒部６４は、連結筒４３の段部４７に外装される。円板部６５は、フランジ４６の前面を覆い、フランジ４６よりもやや大径である。外筒部６４の外面には、ロータコア４２の内周縁が当接すると共に、ロータコア４２の前方で第２筒部材６１のフランジ部６３が当接する。円板部６５には、３つの透孔６６が形成される。各透孔６６には、第２筒部材６１が嵌合する。第２カバー部材６２により、連結筒４３及び回転軸４１、軸受４０と導通する金属製の部材と、ロータコア４２との間が絶縁される。 The second cover member 62 has an outer cylinder portion 64 and a disk portion 65. The outer cylinder portion 64 is exteriorized by the step portion 47 of the connecting cylinder 43. The disk portion 65 covers the front surface of the flange 46 and has a diameter slightly larger than that of the flange 46. The inner peripheral edge of the rotor core 42 abuts on the outer surface of the outer cylinder portion 64, and the flange portion 63 of the second cylinder member 61 abuts in front of the rotor core 42. Three through holes 66 are formed in the disk portion 65. A second cylinder member 61 is fitted into each through hole 66. The second cover member 62 insulates between the connecting cylinder 43, the rotating shaft 41, the metal member conducting with the bearing 40, and the rotor core 42.
　ハウジング６内で回転軸４１には、図２，図３に示すように、前後一対のカム７０が一体に固定される。一対のカム７０は、回転軸４１の軸回りで１８０°の位相をずらして偏心する。各カム７０には、軸受７１を介して、カムリング７２が外装される。カムリング７２は、コネクティングロッド７３を介して、シリンダ７Ａ，７Ｂに収容されたピストン７４とピン結合される。よって、回転軸４１が回転すると、各カム７０とコネクティングロッド７３とによって、回転運動がピストン７４の往復運動に変換され、ピストン７４はカム７０によって互いに逆となるタイミングで往復運動する。こうしてハウジング６の左右には、ピストン７４の往復運動により、両シリンダ７Ａ，７Ｂ内に形成されたシリンダ室７５の空気を交互に圧縮して、タンク２Ａ，２Ｂに圧縮空気を供給するポンプ部７６が形成される。具体的には、まず外気圧がシリンダ７Ａ側のシリンダ室７５で圧縮される。その圧縮空気が配管８Ａを介してシリンダ７Ｂ側のシリンダ室７５に送られてさらに圧縮される。その圧縮空気が配管８Ｂを介してタンク２Ａ，２Ｂに送られる。 As shown in FIGS. 2 and 3, a pair of front and rear cams 70 are integrally fixed to the rotating shaft 41 in the housing 6. The pair of cams 70 are eccentric with a phase shift of 180 ° around the axis of the rotating shaft 41. A cam ring 72 is attached to each cam 70 via a bearing 71. The cam ring 72 is pin-coupled to the piston 74 housed in the cylinders 7A and 7B via the connecting rod 73. Therefore, when the rotating shaft 41 rotates, each cam 70 and the connecting rod 73 convert the rotational motion into the reciprocating motion of the piston 74, and the piston 74 reciprocates at the timing opposite to each other by the cam 70. In this way, on the left and right sides of the housing 6, the pump portion 76 that alternately compresses the air in the cylinder chambers 75 formed in both cylinders 7A and 7B by the reciprocating motion of the piston 74 and supplies the compressed air to the tanks 2A and 2B. Is formed. Specifically, first, the outside air pressure is compressed in the cylinder chamber 75 on the cylinder 7A side. The compressed air is sent to the cylinder chamber 75 on the cylinder 7B side via the pipe 8A and further compressed. The compressed air is sent to the tanks 2A and 2B via the pipe 8B.
　本実施形態のエアコンプレッサ１においては、起動スイッチ（不図示）をＯＮ動作させると、電源がステータ１６の各コイル２０へ供給されて、ロータ１７が回転する。コントローラの制御回路（不図示）が、センサ回路基板３７の回転検出素子から出力されるロータ１７のマグネット５２の位置を示す回転検出信号を得てロータ１７の回転状態を取得する。そして、取得した回転状態に応じて制御回路の各ＦＥＴのＯＮ／ＯＦＦを制御し、三相のコイル２０へ順番に通電させることで、ロータ１７を回転させる。
　ロータ１７が回転すると、回転軸４１も一体に回転するため、各ポンプ部７６が駆動し、２段階に圧縮された圧縮空気がタンク２Ａ，２Ｂへ供給される。タンク２Ａ，２Ｂに貯留された圧縮空気は、カプラ（不図示）に接続されたホースを介して、外部に供給できる。 In the air compressor 1 of the present embodiment, when the start switch (not shown) is turned on, power is supplied to each coil 20 of the stator 16 and the rotor 17 rotates. The controller control circuit (not shown) obtains a rotation detection signal indicating the position of the rotor 17 magnet 52 output from the rotation detection element of the sensor circuit board 37 to acquire the rotation state of the rotor 17. Then, ON / OFF of each FET of the control circuit is controlled according to the acquired rotation state, and the three-phase coils 20 are sequentially energized to rotate the rotor 17.
When the rotor 17 rotates, the rotating shaft 41 also rotates integrally, so that each pump unit 76 is driven and compressed air compressed in two stages is supplied to the tanks 2A and 2B. The compressed air stored in the tanks 2A and 2B can be supplied to the outside via a hose connected to a coupler (not shown).
　モータ１５では、インシュレータ１９により、コイル２０とステータコア１８との間が絶縁（基礎絶縁）される。更に、第１絶縁部３０により、ステータ１６とハウジング６との間が絶縁（付加絶縁）され、また、第２絶縁部６０により、ロータ１７とハウジング６との間とが絶縁（付加絶縁）される、二重絶縁構造となる。よって、電流が仮にステータコア１８へ流れたとしても、電流はハウジング６へ流れない。また、仮にステータコア１８からロータ１７へ電流が流れたとしても、ロータコア４２から連結筒４３及び回転軸４１を介してハウジング６へ電流が流れることを防止できる。これにより、ハウジング６から電流が、人が触れ得るタンク２Ａ，２Ｂへ流れるおそれが低減され、絶縁性能が高まる。 In the motor 15, the insulator 19 insulates (basic insulation) between the coil 20 and the stator core 18. Further, the first insulating portion 30 insulates (additional insulation) between the stator 16 and the housing 6, and the second insulating portion 60 insulates (additionally insulates) between the rotor 17 and the housing 6. It has a double insulation structure. Therefore, even if the current flows to the stator core 18, the current does not flow to the housing 6. Further, even if a current flows from the stator core 18 to the rotor 17, it is possible to prevent the current from flowing from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
　このように、形態１のエアコンプレッサ１によれば、ステータコア１８にインシュレータ１９を介してコイル２０が巻回されるステータ１６と、ステータ１６に対して回転可能であってマグネット５２（磁石）を有するロータ１７とを含むモータ１５と、ステータ１６が接続され、ロータ１７を回転可能に支持する金属製のハウジング６と、を有し、ハウジング６に対してステータ１６とロータ１７とがそれぞれ絶縁されている。すなわち、ステータコア１８とコイル２０との間に介在させたインシュレータ１９による基礎絶縁と、ハウジング６に対してステータ１６とロータ１７とがそれぞれ絶縁される付加絶縁とによる二重絶縁構造となって、絶縁性能が高まる。 As described above, the air compressor 1 of the first embodiment has a stator 16 in which the coil 20 is wound around the stator core 18 via the insulator 19, and a magnet 52 (magnet) that is rotatable with respect to the stator 16. It has a motor 15 including a rotor 17 and a metal housing 6 to which the stator 16 is connected and rotatably supports the rotor 17, and the stator 16 and the rotor 17 are respectively insulated from the housing 6. There is. That is, a double insulation structure is formed by the basic insulation by the insulator 19 interposed between the stator core 18 and the coil 20 and the additional insulation in which the stator 16 and the rotor 17 are respectively insulated from the housing 6. Performance is improved.
　特に、ステータ１６は、ステータコア１８をハウジング６へボルト２７（第１締結部材）で締結することで固定される。締結される箇所にステータコア１８とハウジング６との第１絶縁部３０が形成されてハウジング６とステータ１６とが絶縁されるので、締結箇所を利用した絶縁が簡単に行える。
　また、ロータ１７は、ハウジング６に支持される回転軸４１を有し、マグネット５２を支持するロータコア４２を回転軸４１と一体の連結筒４３へボルト５０（第２締結部材）で締結することで回転軸４１に固定される。締結される箇所にロータコア４２と連結筒４３ひいては回転軸４１との第２絶縁部６０が形成されてハウジング６とロータ１７とが絶縁されるので、ここでも締結箇所を利用した絶縁が簡単に行える。 In particular, the stator 16 is fixed by fastening the stator core 18 to the housing 6 with bolts 27 (first fastening member). Since the first insulating portion 30 between the stator core 18 and the housing 6 is formed at the fastening portion to insulate the housing 6 and the stator 16, insulation using the fastening portion can be easily performed.
Further, the rotor 17 has a rotating shaft 41 supported by the housing 6, and the rotor core 42 supporting the magnet 52 is fastened to the connecting cylinder 43 integrated with the rotating shaft 41 with bolts 50 (second fastening member). It is fixed to the rotating shaft 41. Since the second insulating portion 60 between the rotor core 42 and the connecting cylinder 43 and the rotating shaft 41 is formed at the fastening portion to insulate the housing 6 and the rotor 17, insulation using the fastening portion can be easily performed here as well. ..
　また、締結される箇所での絶縁は、ボルト２７，５０に外装される筒状の第１，第２筒部材３１，６１（第１樹脂部材）と、ハウジング６とステータコア１８又はロータコア４２との間に介在される第１，第２カバー部材３２，６２（第２樹脂部材）とにより行われるので、両部材を利用した絶縁が確実に行える。 Further, the insulation at the fastening portion is provided by the tubular first and second tubular members 31, 61 (first resin member) exteriored by the bolts 27 and 50, and the housing 6 and the stator core 18 or the rotor core 42. Since it is performed by the first and second cover members 32 and 62 (second resin member) interposed between them, insulation using both members can be surely performed.
　そして、ステータコア１８とコイル２０との間に介在させたインシュレータ１９による基礎絶縁と、ハウジング６に対してステータ１６を絶縁する第１絶縁部３０（第１付加絶縁）と、ハウジング６に対してロータ１７を絶縁する第２絶縁部６０（第２付加絶縁）とによって二重に絶縁されるので、付加絶縁の絶縁性能がより高まる。
　特に、ステータ１６がハウジング６に対してボルト２７（第１締結部材）で固定され、第１絶縁部３０は、ボルト２７とステータ１６との間に配置されるので、ボルト２７による締結箇所を利用した第１付加絶縁が簡単に行える。同様に、ロータ１７は、回転軸４１に対して間接的にボルト５０（第２締結部材）で固定されるロータコア４２を有し、第２絶縁部６０は、ボルト５０とロータコア４２との間に配置されるので、ボルト５０による締結箇所を利用した第２付加絶縁が簡単に行える。 Then, the basic insulation by the insulator 19 interposed between the stator core 18 and the coil 20, the first insulating portion 30 (first additional insulation) that insulates the stator 16 from the housing 6, and the rotor with respect to the housing 6. Since it is doubly insulated by the second insulating portion 60 (second additional insulation) that insulates 17, the insulation performance of the additional insulation is further enhanced.
In particular, since the stator 16 is fixed to the housing 6 with bolts 27 (first fastening member) and the first insulating portion 30 is arranged between the bolts 27 and the stator 16, the fastening points by the bolts 27 are used. The first additional insulation can be easily performed. Similarly, the rotor 17 has a rotor core 42 that is indirectly fixed to the rotating shaft 41 by a bolt 50 (second fastening member), and the second insulating portion 60 is located between the bolt 50 and the rotor core 42. Since it is arranged, the second additional insulation using the fastening portion by the bolt 50 can be easily performed.
　次に、本発明の他の形態を説明する。但し、絶縁構造を除いてエアコンプレッサの構造は形態１と同じであるため、重複する説明は省略し、それぞれ図３に相当するモータ部分の断面図のみを用いて各形態を説明する。
［形態２］
　図６において、連結筒４３とロータコア４２との間に第２絶縁部は設けられず、ボルト５０及びワッシャ５４によって直接結合される。
　ロータコア４２では、図７にも示すように、樹脂層８０と、第２樹脂層８１とにより、第２絶縁部６０を形成する。樹脂層８０は、周壁部５１におけるマグネット５２の内周面と前面、後面とに亘って形成される。第２樹脂層８１は、樹脂層８０と連続してロータコア４２の背面全体を覆う。第１絶縁部３０は、形態１と同じである。 Next, another embodiment of the present invention will be described. However, since the structure of the air compressor is the same as that of the first form except for the insulating structure, the overlapping description will be omitted, and each form will be described using only the cross-sectional view of the motor portion corresponding to FIG.
[Form 2]
In FIG. 6, the second insulating portion is not provided between the connecting cylinder 43 and the rotor core 42, and is directly connected by the bolt 50 and the washer 54.
In the rotor core 42, as shown in FIG. 7, the resin layer 80 and the second resin layer 81 form the second insulating portion 60. The resin layer 80 is formed over the inner peripheral surface, the front surface, and the rear surface of the magnet 52 in the peripheral wall portion 51. The second resin layer 81 is continuous with the resin layer 80 and covers the entire back surface of the rotor core 42. The first insulating portion 30 is the same as the first insulating portion 30.
　形態２においても、モータ１５では、インシュレータ１９によるコイル２０とステータコア１８との絶縁（基礎絶縁）に加え、第１絶縁部３０によってステータ１６とハウジング６との間と、第２絶縁部６０によってステータコア１８とロータ１７との間とがそれぞれ絶縁（付加絶縁）されるので、二重絶縁構造となる。よって、電流がステータコア１８を介してハウジング６へ流れることがない。そもそもロータ１７には電流が流れないので、当然ロータコア４２から連結筒４３及び回転軸４１を介してハウジング６へ電流が流れることもない。これにより、ハウジング６から電流が、人が触れ得るタンク２Ａ，２Ｂへ流れるおそれが低減され、絶縁性能が高まる。
　特に、第２絶縁部６０（第２付加絶縁）の樹脂層８０を、ステータコア１８とマグネット５２との間に配置しているので、ボルトによる締結箇所を利用する形態１と比較して付加絶縁構造が簡略化する。 Also in the second embodiment, in the motor 15, in addition to the insulation (basic insulation) between the coil 20 and the stator core 18 by the insulator 19, the stator core is provided between the stator 16 and the housing 6 by the first insulating portion 30 and by the second insulating portion 60. Since the space between the 18 and the rotor 17 is insulated (additional insulation), a double insulation structure is formed. Therefore, the current does not flow to the housing 6 via the stator core 18. Since no current flows through the rotor 17 in the first place, naturally no current flows from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
In particular, since the resin layer 80 of the second insulating portion 60 (second additional insulation) is arranged between the stator core 18 and the magnet 52, the additional insulation structure is compared with the first form in which the fastening portion by the bolt is used. Simplifies.
　なお、形態２において、コイル２０とロータコア４２との間の前後方向の間隔（絶縁距離）が確保できれば、第２樹脂層８１はなくしてもよい。また、第２樹脂層８１に代えて、コイル２０の少なくとも前面側（ロータコア４２側）を樹脂で被覆してもよい。
　また、樹脂層８０をマグネット５２の外周面でなく、ステータコア１８の外周面（少なくともマグネット５２と対向する各ティース２２の外周面）に設けてもよい。 In the second form, the second resin layer 81 may be eliminated as long as the distance (insulation distance) in the front-rear direction between the coil 20 and the rotor core 42 can be secured. Further, instead of the second resin layer 81, at least the front surface side (rotor core 42 side) of the coil 20 may be coated with resin.
Further, the resin layer 80 may be provided not on the outer peripheral surface of the magnet 52 but on the outer peripheral surface of the stator core 18 (at least the outer peripheral surface of each tooth 22 facing the magnet 52).
［形態３］
　図８において、連結筒４３とロータコア４２との間に第２絶縁部が設けられず、樹脂層８０と第２樹脂層８１とで第２絶縁部６０が形成される。樹脂層８０は、周壁部５１におけるマグネット５２の外周面と前面、後面とに亘って形成される。第２樹脂層８１は、樹脂層８０と連続してロータコア４２の背面全体を覆う。第１絶縁部３０は、形態１と同じである。 [Form 3]
In FIG. 8, the second insulating portion is not provided between the connecting cylinder 43 and the rotor core 42, and the second insulating portion 60 is formed by the resin layer 80 and the second resin layer 81. The resin layer 80 is formed over the outer peripheral surface, the front surface, and the rear surface of the magnet 52 on the peripheral wall portion 51. The second resin layer 81 is continuous with the resin layer 80 and covers the entire back surface of the rotor core 42. The first insulating portion 30 is the same as the first insulating portion 30.
　形態３においても、モータ１５では、インシュレータ１９によるコイル２０とステータコア１８との絶縁（基礎絶縁）に加え、第１絶縁部３０によってステータ１６とハウジング６との間と、第２絶縁部６０によってロータコア４２とマグネット５２との間とがそれぞれ絶縁（付加絶縁）されるので、二重絶縁構造となる。よって、電流がステータコア１８を介してハウジング６へ流れることがない。そもそもロータ１７には電流が流れないので、ロータコア４２から連結筒４３及び回転軸４１を介してハウジング６へ電流が流れることもない。これにより、ハウジング６から電流が、人が触れ得るタンク２Ａ，２Ｂへ流れるおそれが低減され、絶縁性能が高まる。
　特に、第２絶縁部６０の樹脂層８０を、ロータコア４２とマグネット５２との間に配置しているので、ボルトによる締結箇所を利用する形態１と比較して付加絶縁構造が簡略化する。 Also in the third embodiment, in the motor 15, in addition to the insulation (basic insulation) between the coil 20 and the stator core 18 by the insulator 19, the rotor core is between the stator 16 and the housing 6 by the first insulating portion 30 and the rotor core by the second insulating portion 60. Since the area between the 42 and the magnet 52 is insulated (additional insulation), a double insulation structure is formed. Therefore, the current does not flow to the housing 6 via the stator core 18. Since no current flows through the rotor 17 in the first place, no current flows from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
In particular, since the resin layer 80 of the second insulating portion 60 is arranged between the rotor core 42 and the magnet 52, the additional insulating structure is simplified as compared with the first embodiment in which the fastening portion with bolts is used.
　なお、形態３においても、コイル２０とロータコア４２との間の前後方向の間隔（絶縁距離）が確保できれば、第２樹脂層８１はなくしてもよい。
　また、形態３では、周壁部５１からマグネット５２が離れるため、フェライト磁石では必要な能力の磁気回路が構築できない場合も想定される。その場合は、ボンド磁石のように単体で磁気回路を構築できるものを採用するとよい。 Also in Form 3, the second resin layer 81 may be eliminated as long as the distance (insulation distance) in the front-rear direction between the coil 20 and the rotor core 42 can be secured.
Further, in the third embodiment, since the magnet 52 is separated from the peripheral wall portion 51, it is assumed that a magnetic circuit having a required capacity cannot be constructed with the ferrite magnet. In that case, it is advisable to adopt a magnet that can construct a magnetic circuit by itself, such as a bond magnet.
［形態４］
　図９において、第１絶縁部３０では、第１筒部材３１と第１カバー部材３２とを一体化して、被覆部２３とも一体化している点が形態１と異なる。すなわち、第１筒部材３１の前端を第１カバー部材３２に繋げる。また、第１筒部材３１のフランジ部３３を内リング２５と第１カバー部材３２の外筒部３４とに繋げ、第１カバー部材３２の円板部３５を内リング２５に繋げて、ステータコア１８と樹脂で一体形成する。
　また、第２絶縁部６０でも、形態１の第２筒部材６１と第２カバー部材６２とを一体化している点が形態１と異なる。すなわち、第２筒部材６１の後端を第２カバー部材６２に繋げると共に、第２筒部材６１のフランジ部６３を第２カバー部材６２の外筒部６４に繋げてロータコア４２と一体形成する。 [Form 4]
FIG. 9 shows that the first insulating portion 30 is different from the first insulating portion 30 in that the first cylinder member 31 and the first cover member 32 are integrated and are also integrated with the covering portion 23. That is, the front end of the first cylinder member 31 is connected to the first cover member 32. Further, the flange portion 33 of the first cylinder member 31 is connected to the inner ring 25 and the outer cylinder portion 34 of the first cover member 32, and the disc portion 35 of the first cover member 32 is connected to the inner ring 25, so that the stator core 18 is connected. And resin are integrally formed.
Further, the second insulating portion 60 is also different from the first in that the second cylinder member 61 and the second cover member 62 of the first embodiment are integrated. That is, the rear end of the second cylinder member 61 is connected to the second cover member 62, and the flange portion 63 of the second cylinder member 61 is connected to the outer cylinder portion 64 of the second cover member 62 to be integrally formed with the rotor core 42.
　形態４においても、モータ１５では、インシュレータ１９によるコイル２０とステータコア１８との絶縁（基礎絶縁）に加え、第１絶縁部３０によってステータ１６とハウジング６との間と、第２絶縁部６０によってロータ１７と連結筒４３、回転軸４１、軸受４０を介したハウジング６との間とがそれぞれ絶縁（付加絶縁）されるので、二重絶縁構造となる。よって、電流がステータコア１８から支持筒１０を介してハウジング６へ流れたり、ロータコア４２から連結筒４３及び回転軸４１を介してハウジング６へ流れたりすることがない。これにより、ハウジング６から電流が、人が触れ得るタンク２Ａ，２Ｂへ流れるおそれが低減され、絶縁性能が高まる。
　特に、第１絶縁部３０はステータコア１８と一体形成され、第２絶縁部６０もロータコア４２と一体形成されて樹脂を含むため、部品点数が少なくなって組み付けの手間が低減する。 Also in the fourth embodiment, in the motor 15, in addition to the insulation (basic insulation) between the coil 20 and the stator core 18 by the insulator 19, the rotor is provided between the stator 16 and the housing 6 by the first insulating portion 30 and the rotor by the second insulating portion 60. Since the 17 is insulated (additional insulation) between the connecting cylinder 43, the rotating shaft 41, and the housing 6 via the bearing 40, a double insulation structure is formed. Therefore, the current does not flow from the stator core 18 to the housing 6 via the support cylinder 10 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
In particular, since the first insulating portion 30 is integrally formed with the stator core 18 and the second insulating portion 60 is also integrally formed with the rotor core 42 and contains resin, the number of parts is reduced and the labor for assembly is reduced.
　なお、形態４において、絶縁部の一体化は第１、第２絶縁部の両方でなく何れか一方のみとしてもよい。一体化構造も上記形態に限らず適宜変更可能である。 Note that, in the fourth embodiment, the insulating portion may be integrated not with both the first and second insulating portions but with only one of them. The integrated structure is not limited to the above form and can be changed as appropriate.
［形態５］
　図１０において、第２絶縁部６０では、第２カバー部材６２Ａを、連結筒４３のフランジ４６の外周面と段部４７の前面とを覆うように長く形成して、ロータコア４２と連結筒４３との間の絶縁を図っている点が形態４と異なる。すなわち、ロータコア４２と連結筒４３とを、第２カバー部材６２Ａによって樹脂で一体成形する。第１絶縁部３０は、形態４と同じである。 [Form 5]
In FIG. 10, in the second insulating portion 60, the second cover member 62A is formed long so as to cover the outer peripheral surface of the flange 46 of the connecting cylinder 43 and the front surface of the stepped portion 47, and the rotor core 42 and the connecting cylinder 43 are formed. It differs from Form 4 in that it is insulated between the two. That is, the rotor core 42 and the connecting cylinder 43 are integrally molded with resin by the second cover member 62A. The first insulating portion 30 is the same as that of the fourth form.
　形態５においても、モータ１５では、インシュレータ１９によるコイル２０とステータコア１８との絶縁（基礎絶縁）に加え、第１絶縁部３０によってステータ１６とハウジング６との間と、第２絶縁部６０によってロータ１７と連結筒４３、回転軸４１、軸受４０を介したハウジング６との間とがそれぞれ絶縁（付加絶縁）されるので、二重絶縁構造となる。よって、電流がステータコア１８を介してハウジング６へ流れたり、ロータコア４２から連結筒４３及び回転軸４１を介してハウジング６へ流れたりすることがない。これにより、ハウジング６から電流が、人が触れ得るタンク２Ａ，２Ｂへ流れるおそれが低減され、絶縁性能が高まる。 Also in the fifth embodiment, in the motor 15, in addition to the insulation (basic insulation) between the coil 20 and the stator core 18 by the insulator 19, the rotor is provided between the stator 16 and the housing 6 by the first insulating portion 30 and the rotor by the second insulating portion 60. Since the 17 is insulated (additional insulation) between the connecting cylinder 43, the rotating shaft 41, and the housing 6 via the bearing 40, a double insulation structure is formed. Therefore, the current does not flow to the housing 6 via the stator core 18 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
［形態６］
　先の形態１～５は、インシュレータ１９による基礎絶縁と別に付加絶縁を施した二重絶縁構造であるが、二重絶縁でなく基礎絶縁の機能を高くした強化絶縁構造でもよい。
　図１１はその一例を示すもので、ステータコア１８及びロータコア４２は、ボルト２７，５０により、それぞれ直接大径部１１及びフランジ４６へ固定され、第１、第２絶縁部は設けられない。
　一方、ステータコア１８では、インシュレータ１９Ａを、コイル２０の巻回部分での肉厚が先の形態のインシュレータ１９及び被覆部２３よりも大きくなるように形成して、各ティース２２とコイル２０との絶縁距離を大きくする。 [Form 6]
The above modes 1 to 5 have a double insulation structure in which additional insulation is applied separately from the basic insulation by the insulator 19, but a reinforced insulation structure having an enhanced basic insulation function may be used instead of the double insulation.
FIG. 11 shows an example thereof. The stator core 18 and the rotor core 42 are directly fixed to the large diameter portion 11 and the flange 46 by bolts 27 and 50, respectively, and the first and second insulating portions are not provided.
On the other hand, in the stator core 18, the insulator 19A is formed so that the wall thickness at the winding portion of the coil 20 is larger than that of the insulator 19 and the covering portion 23 of the previous form, and the teeth 22 and the coil 20 are insulated from each other. Increase the distance.
　形態６によれば、モータ１５では、コイル２０の巻回部分であるインシュレータ１９Ａを他の部分である被覆部２３よりも肉厚とすることで、コイル２０とステータコア１８との絶縁（基礎絶縁）が強化されて、モータ１５がハウジング６に対して強化絶縁される。よって、電流がステータコア１８を介してハウジング６へ流れたり、ロータコア４２から連結筒４３及び回転軸４１を介してハウジング６へ流れたりすることがない。これにより、ハウジング６から電流が、人が触れ得るタンク２Ａ，２Ｂへ流れるおそれが低減され、絶縁性能が高まる。 According to the sixth embodiment, in the motor 15, the insulator 19A, which is the winding portion of the coil 20, is made thicker than the covering portion 23, which is the other portion, so that the coil 20 and the stator core 18 are insulated (basic insulation). Is reinforced and the motor 15 is reinforced and insulated from the housing 6. Therefore, the current does not flow to the housing 6 via the stator core 18 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
　なお、形態６においても、コイル２０とロータコア４２との間の前後方向の間隔（絶縁距離）が短ければ、ロータコア４２の背面に樹脂層を形成してもよい。 Also in Form 6, if the distance (insulation distance) in the front-rear direction between the coil 20 and the rotor core 42 is short, a resin layer may be formed on the back surface of the rotor core 42.
［形態７］
　図１２においても、ステータコア１８及びロータコア４２は、ボルト２７，５０により、それぞれ直接大径部１１及びフランジ４６へ固定され、第１、第２絶縁部は設けられない。
　一方、ステータコア１８では、各コイル２０を樹脂でモールドして、各コイル２０の外側に、インシュレータ１９と接触するモールド層８２を形成して、各ティース２２とコイル２０との絶縁距離を大きくする。 [Form 7]
Also in FIG. 12, the stator core 18 and the rotor core 42 are directly fixed to the large diameter portion 11 and the flange 46 by bolts 27 and 50, respectively, and the first and second insulating portions are not provided.
On the other hand, in the stator core 18, each coil 20 is molded with a resin, and a mold layer 82 in contact with the insulator 19 is formed on the outside of each coil 20 to increase the insulation distance between each tooth 22 and the coil 20.
　形態７によれば、コイル２０の外側がモールド層８２（樹脂）でモールドされるので、コイル２０とステータコア１８との絶縁（基礎絶縁）が強化されて、モータ１５がハウジング６に対して強化絶縁される。よって、電流がステータコア１８を介してハウジング６へ流れたり、ロータコア４２から連結筒４３及び回転軸４１を介してハウジング６へ流れたりすることがない。これにより、ハウジング６から電流が、人が触れ得るタンク２Ａ，２Ｂへ流れるおそれが低減され、絶縁性能が高まる。
　なお、形態６，７の強化絶縁は、同時に実施しても差し支えない。これによればさらに絶縁性能が高まる。 According to the seventh embodiment, since the outside of the coil 20 is molded with the mold layer 82 (resin), the insulation (basic insulation) between the coil 20 and the stator core 18 is strengthened, and the motor 15 is strengthened and insulated from the housing 6. Will be done. Therefore, the current does not flow to the housing 6 via the stator core 18 or from the rotor core 42 to the housing 6 via the connecting cylinder 43 and the rotating shaft 41. As a result, the possibility that current flows from the housing 6 to the tanks 2A and 2B that can be touched by humans is reduced, and the insulation performance is improved.
The reinforced insulation of Forms 6 and 7 may be performed at the same time. According to this, the insulation performance is further improved.
　各形態に共通して、ティースの数やボルトの数及び配置は適宜変更可能で、ハウジングに対するモータの位置も前面に限らない。絶縁する箇所も、ボルトやネジによる締結箇所に限らず、ハウジングにおける支持筒の付け根部分や、軸受を越えたハウジングの前面部分等にそれぞれ付加絶縁を施すこともできる。
　また、各形態では、回転軸と連結された別体の連結筒にロータコアをボルト止めしているが、回転軸と一体に形成した連結筒にロータコアをボルト止めしてもよい。 Common to each form, the number of teeth and the number and arrangement of bolts can be changed as appropriate, and the position of the motor with respect to the housing is not limited to the front surface. The portion to be insulated is not limited to the portion to be fastened with bolts or screws, and additional insulation can be applied to the base portion of the support cylinder in the housing, the front portion of the housing beyond the bearing, and the like.
Further, in each form, the rotor core is bolted to a separate connecting cylinder connected to the rotating shaft, but the rotor core may be bolted to a connecting cylinder formed integrally with the rotating shaft.
　また、本発明において、適用可能なモータはアウタロータ型に限らず、インナロータ型であっても差し支えないし、回転検出素子を用いずに誘起電力でロータの位置を検出するセンサレス型でもよい。また、ブラシレスでなくブラシ付のモータでもよい。
　そして、電動作業機としてはエアコンプレッサに限らず、草刈機、チェーンソー、ブロワ、集塵機、さらにはドリルやドライバ、丸鋸等の電動工具であっても本発明は適用可能である。これらの電動作業機において、金属製のハウジング、又はそのハウジングに導通して人が触る可能性がある箇所を有する場合に本発明は有用となる。 Further, in the present invention, the applicable motor is not limited to the outer rotor type, but may be an inner rotor type, or may be a sensorless type that detects the position of the rotor by induced power without using a rotation detection element. Further, a motor with a brush may be used instead of the brushless motor.
The present invention is applicable not only to an air compressor but also to a mower, a chainsaw, a blower, a dust collector, and an electric tool such as a drill, a driver, or a circular saw. The present invention is useful when these electric working machines have a metal housing or a portion conductive to the housing that may be touched by a person.
１・・エアコンプレッサ
２Ａ，２Ｂ・・タンク
３・・基台
４・・本体部
６・・ハウジング
７Ａ，７Ｂ・・シリンダ
８Ａ，８Ｂ・・配管
１０・・支持筒
１１・・大径部
１２・・小径部
１５・・モータ
１６・・ステータ
１７・・ロータ
１８・・ステータコア
１９，１９Ａ・・インシュレータ
２０・・コイル
２１・・基部
２２・・ティース
２３・・被覆部
２６・・第１貫通孔
２７，４５，５０・・ボルト
３０・・第１絶縁部
３１・・第１筒部材
３２・・第１カバー部材
３３，６３・・フランジ部
３４，６４・・外筒部
３５，６５・・円板部
４１・・回転軸
４２・・ロータコア
４６・・フランジ
５１・・周壁部
５２・・マグネット
５５・・第２貫通孔
６０・・第２絶縁部
６１・・第２筒部材
６２・・第２カバー部材
７０・・カム
７４・・ピストン
８０・・第１樹脂層
８１・・第２樹脂層
８３・・モールド層
  1 ・ ・ Air compressor 2A, 2B ・ ・ Tank 3 ・ ・ Base 4 ・ ・ Main body 6 ・ ・ Housing 7A, 7B ・ ・ Cylinder 8A, 8B ・ ・ Piston 10 ・ ・ Support cylinder 11 ・ ・ Large diameter part 12 ・・ Small diameter part 15 ・ ・ Motor 16 ・ ・ Stator 17 ・ ・ Rotor 18 ・ ・ Stator core 19, 19A ・ ・ Insulator 20 ・ ・ Cylinder 21 ・ ・ Base 22 ・ ・ Teeth 23 ・ ・ Covering part 26 ・ ・ First through hole 27 , 45, 50 ... Bolt 30 ... 1st insulation 31 ... 1st cylinder member 32 ... 1st cover member 33, 63 ... Flange 34, 64 ... Outer cylinder 35, 65 ... Disc Part 41 ・ ・ Rotating shaft 42 ・ ・ Rotor core 46 ・ ・ Flange 51 ・ ・ Peripheral wall part 52 ・ ・ Magnet 55 ・ ・ Second through hole 60 ・ ・ Second insulating part 61 ・ ・ Second cylinder member 62 ・ ・ Second cover Member 70 ... Cam 74 ... Piston 80 ... First resin layer 81 ... Second resin layer 83 ... Mold layer

Claims (14)

  1. 　金属製のハウジングと、
    　モータであって、
    　　前記ハウジングに対して絶縁して接続されるステータであって、ステータコアにインシュレータを介してコイルが巻回されるステータと、
    　　前記ハウジングに対して絶縁されるロータであって、磁石を有し、前記ステータに対して回転可能なロータと、
    　を有するモータと、
    　を有する電動作業機。     With a metal housing
    It ’s a motor,
    A stator that is insulated and connected to the housing and in which a coil is wound around the stator core via an insulator.
    A rotor that is insulated from the housing, has a magnet, and is rotatable with respect to the stator.
    With a motor that has
    Electric work machine with.
  2. 　前記ステータコアを前記ハウジングへ固定する第１締結部材と、
    　前記第１締結部材により締結される箇所に配置され、前記ステータコアと前記ハウジングとの間を絶縁する第１絶縁部と、
    　を更に有する、請求項１に記載の電動作業機。     A first fastening member for fixing the stator core to the housing,
    A first insulating portion that is arranged at a position where the first fastening member is fastened and that insulates between the stator core and the housing.
    The electric working machine according to claim 1, further comprising.
  3. 　前記ロータは、
    　　前記ハウジングに支持される回転軸と、
    　　前記磁石を支持するロータコアと、を有し、
    　前記電動作業機は、
    　前記ロータコアを前記回転軸へ固定する第２締結部材と、
    　前記第２締結部材により締結される箇所に配置され、前記ロータコアと前記回転軸との間を絶縁する第２絶縁部と、
    　を更に有する、請求項１又は２に記載の電動作業機。     The rotor
    The rotating shaft supported by the housing and
    With a rotor core that supports the magnet,
    The electric work machine
    A second fastening member that fixes the rotor core to the rotating shaft,
    A second insulating portion that is arranged at a position where the second fastening member is fastened and that insulates between the rotor core and the rotating shaft.
    The electric working machine according to claim 1 or 2, further comprising.
  4. 　前記第１絶縁部及び前記第２絶縁部は、それぞれ、
    　　前記第１締結部材及び前記第２締結部材に外装される筒状の第１樹脂部材と、
    　　前記ハウジングと前記ステータコア又は前記ロータコアとの間に介在される第２樹脂部材と、
    　を有する、請求項３に記載の電動作業機。     The first insulating portion and the second insulating portion are respectively
    A tubular first resin member exteriorized by the first fastening member and the second fastening member,
    A second resin member interposed between the housing and the stator core or the rotor core,
    The electric working machine according to claim 3.
  5. 　ハウジングと、
    　前記ハウジングによって支持され、前記ハウジングに対して二重絶縁されるモータであって、
    　　ステータと、
    　　前記ステータに対して回転可能なロータと、
    　を有するモータと、
    　前記ロータの回転に伴い駆動するポンプ部と、
    　を有するエアコンプレッサ。     With the housing
    A motor that is supported by the housing and double insulated from the housing.
    With the stator
    A rotor that can rotate with respect to the stator,
    With a motor that has
    A pump unit that is driven by the rotation of the rotor and
    Air compressor with.
  6. 　前記ステータは、
    　　ステータコアと、
    　　前記ステータコアに巻回されるコイルと、を有し、
    　前記モータは、
    　　前記ステータコアと前記コイルとの間に介在させた基礎絶縁部と、
    　　前記ハウジングに対して前記ステータを絶縁する第１付加絶縁部と、
    　　前記ハウジングに対して前記ロータを絶縁する第２付加絶縁部と、
    　によって、前記ハウジングに対して二重絶縁される、
    　請求項５に記載のエアコンプレッサ。     The stator is
    With the stator core
    It has a coil wound around the stator core and
    The motor
    A basic insulating portion interposed between the stator core and the coil,
    A first additional insulation portion that insulates the stator with respect to the housing,
    A second additional insulation portion that insulates the rotor from the housing,
    Double insulated from the housing by
    The air compressor according to claim 5.
  7. 　前記ハウジングは、前記ロータを保持するとともに、ピストンを内部に有し、更にタンクが接続される、
    　請求項５又は６に記載のエアコンプレッサ。     The housing holds the rotor, has a piston inside, and is further connected to a tank.
    The air compressor according to claim 5 or 6.
  8. 　前記ステータを前記ハウジングに対して固定する第１締結部材を更に有し、
    　前記第１付加絶縁部は、前記第１締結部材と前記ステータとの間に配置される、
    　請求項６に記載のエアコンプレッサ。     It further comprises a first fastening member that secures the stator to the housing.
    The first additional insulating portion is arranged between the first fastening member and the stator.
    The air compressor according to claim 6.
  9. 　前記ロータは、
    　　回転軸に対して直接又は間接的に第２締結部材で固定されるロータコアを有し、
    　前記第２付加絶縁部は、前記第２締結部材と前記ロータコアとの間に配置される、
    　請求項６に記載のエアコンプレッサ。     The rotor
    It has a rotor core that is directly or indirectly fixed to the rotating shaft by a second fastening member.
    The second additional insulation portion is arranged between the second fastening member and the rotor core.
    The air compressor according to claim 6.
  10. 　前記ロータは、
    　　ロータコアと、
    　　前記ロータコアに固定されて、前記ステータコアと対向する磁石と、を有し、
    　前記第２付加絶縁部は、前記ステータコアと前記磁石との間に配置される、
    　請求項６に記載のエアコンプレッサ。     The rotor
    With the rotor core
    It has a magnet that is fixed to the rotor core and faces the stator core.
    The second additional insulation portion is arranged between the stator core and the magnet.
    The air compressor according to claim 6.
  11. 　前記ロータは、
    　　ロータコアと、
    　　前記ロータコアに固定される磁石と、を有し、
    　前記第２付加絶縁部は、前記ロータコアと前記磁石との間に配置される、
    　請求項６に記載のエアコンプレッサ。     The rotor
    With the rotor core
    With a magnet fixed to the rotor core,
    The second additional insulation portion is arranged between the rotor core and the magnet.
    The air compressor according to claim 6.
  12. 　前記第１付加絶縁部は、前記ステータコアと一体的に形成される樹脂を含む、
    　請求項８に記載のエアコンプレッサ。     The first additional insulating portion contains a resin integrally formed with the stator core.
    The air compressor according to claim 8.
  13. 　前記第２付加絶縁部は、前記ロータコアと一体的に形成される樹脂を含む、
    　請求項９乃至１１の何れかに記載のエアコンプレッサ。     The second additional insulation portion contains a resin integrally formed with the rotor core.
    The air compressor according to any one of claims 9 to 11.
  14. 　ハウジングと、
    　モータであって、
    　　前記ハウジングに固定されるステータであって、ステータコアにインシュレータを介してコイルが巻回されるステータと、
    　　前記ハウジングに回転可能に支持されるロータであって、前記ステータの外側に配置され、磁石を有するロータと、
    　を有するモータと、
    　前記インシュレータにおける前記コイルの巻回部分は、他の部分よりも肉厚である、または、前記コイルの外側を樹脂でモールドされる、
    　電動作業機。     With the housing
    It ’s a motor,
    A stator fixed to the housing, in which a coil is wound around the stator core via an insulator, and a stator.
    A rotor that is rotatably supported by the housing and is located outside the stator and has a magnet.
    With a motor that has
    The winding portion of the coil in the insulator is thicker than the other portions, or the outside of the coil is molded with resin.
    Electric work machine.
PCT/JP2020/018383 2019-07-23 2020-05-01 Electric work machine and air compressor WO2021014711A1 (en)

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JP2019135557A JP7324638B2 (en) 2019-07-23 2019-07-23 air compressor

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1032947A (en) * 1996-07-16 1998-02-03 Toshiba Corp Manufacture of rotor
JP2002524013A (en) * 1998-08-21 2002-07-30 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Electric machine with a rotor rotating around a stator
US20090064727A1 (en) * 2005-02-01 2009-03-12 Lg Electronics Inc. Driving apparatus for washing machine
JP2010130847A (en) * 2008-11-28 2010-06-10 Nidec Sankyo Corp Electric motor
JP2016050526A (en) * 2014-08-29 2016-04-11 日立工機株式会社 air compressor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1032947A (en) * 1996-07-16 1998-02-03 Toshiba Corp Manufacture of rotor
JP2002524013A (en) * 1998-08-21 2002-07-30 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Electric machine with a rotor rotating around a stator
US20090064727A1 (en) * 2005-02-01 2009-03-12 Lg Electronics Inc. Driving apparatus for washing machine
JP2010130847A (en) * 2008-11-28 2010-06-10 Nidec Sankyo Corp Electric motor
JP2016050526A (en) * 2014-08-29 2016-04-11 日立工機株式会社 air compressor

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