WO2011043143A1 - Rotating electric machine, and dental or medical handpiece - Google Patents

Rotating electric machine, and dental or medical handpiece Download PDF

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Publication number
WO2011043143A1
WO2011043143A1 PCT/JP2010/064929 JP2010064929W WO2011043143A1 WO 2011043143 A1 WO2011043143 A1 WO 2011043143A1 JP 2010064929 W JP2010064929 W JP 2010064929W WO 2011043143 A1 WO2011043143 A1 WO 2011043143A1
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WO
WIPO (PCT)
Prior art keywords
coil
cylindrical
mounting member
permanent magnet
electrical machine
Prior art date
Application number
PCT/JP2010/064929
Other languages
French (fr)
Japanese (ja)
Inventor
伸治 木下
Original Assignee
セイコーインスツル株式会社
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
Priority claimed from JP2010165929A external-priority patent/JP5615613B2/en
Application filed by セイコーインスツル株式会社 filed Critical セイコーインスツル株式会社
Priority to ATA9371/2010A priority Critical patent/AT511025B1/en
Publication of WO2011043143A1 publication Critical patent/WO2011043143A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/47—Air-gap windings, i.e. iron-free windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/04—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of windings, prior to mounting into machines
    • H02K15/0435—Wound windings
    • H02K15/0464—Lap windings
    • H02K15/0471—Lap windings manufactured by flattening a spiral winding

Definitions

  • the present invention relates to a coreless type motor using a cylindrical coil used for medical equipment, precision measuring devices, etc., or a rotating electrical machine to be a generator, and a dental or medical handpiece provided with the rotating electrical machine. Is.
  • This motor has a thin sheet on the inner circumference side of the air-core coil, so that the gap between the permanent magnet and the case can be reduced, and a large torque can be generated.
  • the motor in order to generate a high torque, the motor is formed so as to increase the magnetic flux linked to this coil, and therefore it is necessary to set a small gap between the permanent magnet and the yoke. That is, the gap between the permanent magnet and the yoke is reduced to keep the magnetic flux density of the permanent magnet high, and the effective magnetic flux in the gap is increased. Thereby, the generated torque of the motor is increased, and the energy efficiency of the motor is increased. Conversely, if the gap is large, the magnetic flux of the permanent magnets interlinking the coil is reduced, the generated torque of the motor is reduced.
  • a plurality of air-core coils are attached to the outer peripheral surface of the seat side by side in the circumferential direction, and the air-core coils are covered with the seat and are shielded from the outside air.
  • the air-core coil is formed by winding a self-bonding wire into a substantially short air-core shape, and a plurality of air-core coils 101 including the coil portion 102 and the air-core portion 103 are arranged in the circumferential direction.
  • the air-core coil 101 has a space between the air-core portion 103 and a space between one coil portion 102 and another coil portion 102.
  • the resin layer is thin at the coil portion of the air-core coil, and the air-core portion and the space between one coil portion and the other coil portion are thick. Therefore, if the motor is left in the atmosphere of high-temperature and pressurized steam and the resin swells, the thicker the resin is, the larger the volume expands and the sheet is deformed. Therefore, there exists a problem that a sheet
  • a rotating electrical machine includes a permanent magnet having a plurality of magnetic poles arranged in the circumferential direction on the outer periphery, and a cylindrical body at a position facing the permanent magnet via an air gap.
  • the cylindrical coil of the present invention has a uniform arrangement of coils wound in a polygonal shape in a cylindrical shape, and the winding can be wound more densely than an air-core coil. it can. Therefore, the volume of the sealed space of the coil can be reduced, and deformation and breakage of the coil mounting member due to air expansion can be prevented. Further, since the deformation of the coil mounting member can be prevented, the thickness of the cylindrical body portion of the coil mounting member can be reduced.
  • the rotating electrical machine according to the present invention includes an exterior member provided on the outer peripheral side of the yoke.
  • the rotating electrical machine according to the present invention is characterized in that the sealed space is filled with a resin in a range covering at least the cylindrical coil.
  • the configuration of the present invention makes it possible to reduce the air in the sealed space, so that deformation and breakage of the cylindrical body can be prevented even if the air expands due to the high temperature of sterilization. Moreover, since the deformation
  • the resin part molded in the air-core coil is not uniform in the radial direction in the conventional technology.
  • the air-core coil is deformed or damaged.
  • the cylindrical coil of the present invention has a uniform coil thickness, the thickness of the filled resin is also uniform, and when the resin swells, the cylindrical body can be prevented from being deformed or damaged. it can.
  • the thickness of the cylindrical body can be reduced. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
  • the cylindrical coil is formed into a flat plate by tilting a winding wound around a polygonal winding frame in the winding direction of the winding frame, and then the cylindrical body portion of the coil mounting member.
  • the cylindrical coil is provided with a linear conductor portion along the longitudinal direction of the permanent magnet.
  • a cylindrical coil is a coil in which windings having a polygonal shape for one turn are arranged in a cylindrical shape, and are roughly classified into the following three types.
  • Tortoise shell ( Figure 3 (a)) (2) Rhombus winding (Figure 3 (b)) (3) Honeycomb winding ( Figure 3 (c))
  • Tortoise shell winding has a part of the winding on the cylindrical shaft, so the linear conductor in the cylindrical axis direction that contributes to the generation of torque exists in the center of the cylindrical winding, and the force received by the magnetic pole effectively rotates the torque.
  • Kameaki is considered to be the most efficient with three winding methods.
  • the rhombus winding does not have a linear conductor portion in the cylindrical axis direction that contributes to torque and is a conductor portion inclined as a whole, the utilization efficiency of the winding is worse than that of the turtle shell winding. Therefore, the rhombus winding is not a preferable winding method for increasing the efficiency.
  • the honeycomb winding does not have a linear conductor portion in the cylindrical axis direction that contributes to torque like the rhombus winding, and the use efficiency of the winding is worse than that of the turtle shell winding.
  • FIG. 4 is a diagram for explaining the winding work.
  • the aligned winding 62 is wound around the hexagonal winding frame 61, and is temporarily fixed with a tape 63 to prevent the winding from being collapsed while being wound around the winding frame 61. In that state, it is extracted from the hexagonal reel 61.
  • FIG. 5 is a diagram for explaining the flat work.
  • a pair of hexagonal facing surfaces of the winding 62 extracted from the winding frame 61 are tilted in the axial direction of the winding frame to form a flat plate shape.
  • FIG. 6 is a diagram for explaining the curling work.
  • a flat wire is wound around the curling rod 64.
  • a tape is wound around the curled outer periphery.
  • FIG. 7 is a diagram for explaining the annealing operation.
  • the cylindrical coil 65 from which the curling rod 64 has been removed is heated, and the cylindrical coil 65 is pressed with a cylindrical forming jig to be shaped so as to improve the cylindricity. Since the windings use self-bonding wires, the windings are fused together and are not collapsed by heating.
  • the turtle shell winding cylindrical coil is created by the above process.
  • the curling operation and the annealing operation which have been conventionally performed are abolished, the winding wound around the polygonal winding frame is tilted in the winding direction to form a flat plate, and then the cylindrical body of the coil mounting member A cylindrical shape is formed by wrapping around. Therefore, the gap between the cylindrical body and the cylindrical coil can be made smaller than inserting a cylindrical coil formed in a cylindrical shape in advance into the cylindrical body. Furthermore, since the coil is formed following the cylindrical shape of the cylindrical body portion, the cylindrical shape of the coil can be formed with high accuracy, and the gap between the outer surface of the cylindrical body portion and the yoke can be set small.
  • the coil mounting member is characterized in that the radial thickness of the end portion on the cylindrical shaft is thicker than the radial thickness of the cylindrical body portion.
  • the coil mounting member includes an outer diameter large diameter portion having a larger diameter than an outer diameter of the cylindrical body portion at an end portion on the cylindrical shaft of the cylindrical body portion. It is characterized by.
  • the amount of deformation of the cylindrical body can be reduced with respect to the stress that deforms the cylindrical body, so that deformation can be suppressed even if the cylindrical body is thin. Further, since the deformation of the cylindrical body portion is suppressed, the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the cylindrical body portion and the gap between the outer peripheral surface of the cylindrical body portion and the inner peripheral surface of the yoke can be reduced. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
  • the rotating electrical machine according to the present invention is characterized in that the yoke is set such that a radial length of the yoke is longer than a radial length of the cylindrical body.
  • the cylindrical body is disposed on the inner peripheral side of the cylindrical coil, and the yoke is disposed on the outer peripheral side of the cylindrical coil. Is sandwiched between the cylindrical body and the yoke.
  • the yoke having a long radial length can reduce the deformation amount with respect to the stress that deforms the cylindrical body. Therefore, even if the cylindrical body is thin, deformation of the cylindrical body can be suppressed.
  • the rotating electrical machine according to the present invention is characterized in that the coil mounting member is made of resin.
  • the rotating electrical machine according to the present invention is characterized in that the coil mounting member is formed of a resin having a flexural modulus of 5000 MPa or more.
  • the coil mounting member is a resin
  • the coil can be linked to the coil without blocking the magnetic flux of the permanent magnet.
  • the bending elastic modulus of the coil mounting member is 5000 MPa or more, deformation during processing is prevented and processing can be performed with high accuracy. Therefore, the clearance between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the coil mounting member and the clearance between the outer peripheral surface of the coil mounting member and the inner peripheral surface of the yoke can be reduced.
  • the coil mounting member can be processed into a thin wall by cutting. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
  • the rotating electrical machine according to the present invention is characterized in that the exterior member is made of resin.
  • the rotating electrical machine according to the present invention is characterized in that the exterior member is made of a resin having a flexural modulus of 5000 MPa or more.
  • the exterior member is a resin, leakage current can be prevented.
  • the bending elastic modulus of an exterior member is 5000 MPa or more, the deformation
  • the rotating electrical machine according to the present invention includes a bearing in which the permanent magnet is attached to a rotatable shaft, and is disposed at a position different from the permanent magnet of the shaft. It is in contact with the inner peripheral surface of a bearing holding member that is disposed away from the coil mounting member. According to the configuration of the present invention, since the magnetic flux from the permanent magnet interlinked with the cylindrical coil does not leak around the bearing, the magnetic flux interlinked with the cylindrical coil does not decrease, and the energy efficiency of the rotating electrical machine is increased. can do.
  • the rotating electrical machine includes a bearing in which the permanent magnet is attached to a rotatable shaft, and is disposed at a position different from the permanent magnet of the shaft. It is in contact with the inner peripheral surface of the coil mounting member or the inner peripheral surface of the bearing holding member disposed on the inner peripheral side of the coil mounting member.
  • the permanent magnet and the coil mounting member can be accurately and coaxially arranged. Therefore, the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the coil mounting member can be reduced. Therefore, it is possible to reduce a gap between the permanent magnet and the yoke, it is possible to increase the energy efficiency of the rotating electric machine.
  • the rotating electrical machine includes two bearings in which the permanent magnet is attached to a rotatable shaft, and is disposed at a position different from the permanent magnet of the shaft, and the outer periphery of one of the bearings
  • the surface is in contact with the inner peripheral surface of the coil mounting member or the inner peripheral surface of the bearing holding member disposed on the inner peripheral side of the coil mounting member, and the outer peripheral surface of the other bearing is the coil mounting member. It is in contact with the inner peripheral surface of the bearing holding member that is arranged away from the member.
  • the coaxial between the permanent magnet and the coil mounting member can be arranged with high precision by one bearing, and the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the coil mounting member can be kept small.
  • the other bearing at a position away from the coil mounting member, it is possible to prevent the magnetic flux of the permanent magnet from leaking around the bearing and to increase the energy efficiency of the rotating electrical machine.
  • the rotary electric machine according to the present invention the bearing, characterized in that it is arranged at the end of the shaft.
  • vibration generated in the rotating electrical machine can be reduced, and a load can be distributed to the bearings to extend the life of the bearings.
  • the rotating electrical machine according to the present invention rotates the turbine blade, the turbine blade disposed at a position different from the permanent magnet and the bearing of the shaft, the light emitting component electrically connected to the cylindrical coil, and the turbine blade. It can be used for a dental or medical handpiece comprising an air supply pipe for supplying a fluid to be supplied. Since the dental or medical handpiece according to the present invention includes the rotating electrical machine described above, the energy efficiency is high and the illuminance of the light emitting component of the handpiece can be increased. In addition, the cost of the handpiece itself can be reduced.
  • the volume of the closed space of the coil can be reduced, and deformation and breakage of the coil mounting member due to air expansion can be prevented. Further, since the deformation of the coil mounting member can be prevented, the thickness of the cylindrical body portion of the coil mounting member can be reduced. Therefore, it is possible to possible to reduce the gap between the permanent magnet and the yoke, increasing the energy efficiency of the rotating electric machine.
  • FIG. 1 It is a schematic sectional drawing which incorporated the rotary electric machine concerning this invention in the handpiece for dental treatment. It is sectional drawing of the rotary electric machine of this invention. It is a figure which shows the winding method of a cylindrical coil. It is a figure which shows the state of the coil
  • a dental treatment handpiece 1 includes a tool turbine 21 that rotationally drives a treatment tool 22 around an axis L, a head portion 2 that rotatably holds the tool turbine 21, and an operation. It is comprised from the holding part 3 hold
  • the grip portion 3 has an air supply pipe 51 and a water supply pipe 52 extending forward at the rear end.
  • a rotating electrical machine 40 is provided in the rear housing 38. Moreover, in this embodiment, the rotary electric machine 40 is used as a generator.
  • a shaft 46 that is rotatably supported by bearings 47 and 48 is provided at the center of the cylindrical shaft of the rotating electrical machine 40.
  • the bearing 48 is held by a bearing holding member 54 disposed on the front housing 39 side.
  • the bearing 47 is held by a bearing holding member 53 that is fitted to the coil mounting member 41.
  • the bearing 48 and the bearing 47 are preferably not affected by the magnetic flux of the permanent magnet. In this case, for example, an oil-impregnated bearing mainly composed of copper is preferable.
  • a permanent magnet 45 is provided on the outer peripheral surface of the shaft 46.
  • a coil mounting member 41 is disposed via the permanent magnet 45 and the air gap.
  • a cylindrical coil 44 is provided on the outer peripheral surface of the coil mounting member 41.
  • a yoke 43 is provided at a position facing the outer periphery of the cylindrical coil 44.
  • a power generation turbine blade 37 is provided in front of the shaft 46. In FIG. 1, the power generation turbine blade 37 and the permanent magnet 45 are provided between the bearings 47 and 48, but the power generation turbine blade 37 is not necessarily between the bearings 47 and 48. In this case, the power generation turbine blade 37 may be disposed at a position different from the position where the permanent magnet 45 and the bearings 47 and 48 are disposed on the shaft 46. For example, the power generation turbine blade 37 may be disposed on the shaft 46 on the outer side of the bearing 48.
  • FIG. 2 is a cross-sectional view of the rotating electrical machine 40 shown in FIG. As shown in FIG. 2, the rotating electrical machine 40 includes a shaft 46 at the center of the cylindrical axis.
  • a permanent magnet 45 is rotatably provided on the outer peripheral surface of the shaft 46. Further, the bearing 47 and the bearing 48 are arranged at positions different from the permanent magnet 45 on the shaft 46. In the case of the present embodiment, the bearing 47 and the bearing 48 are disposed on the end side of the permanent magnet 45 in the shaft 46. The outer peripheral surface of the bearing 47 is in contact with the inner peripheral surface of the bearing holding member 53 disposed on the inner peripheral side of the coil mounting member 41. In this case, since the outer peripheral surface of the bearing 47 is in contact with the inner peripheral surface of the bearing holding member 53 disposed on the inner peripheral side of the coil mounting member 41, the permanent magnet 45 and the coil mounting member 41 are accurately and coaxially disposed.
  • the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the coil mounting member 41 can be reduced. Therefore, since the gap between the permanent magnet 45 and the yoke 43 can be reduced, the energy efficiency of the rotating electrical machine 40 can be increased.
  • the bearing 47 is not necessarily in contact with the inner peripheral surface of the bearing holding member 53, and may be in direct contact with the inner peripheral surface of the coil mounting member 41.
  • the outer peripheral surface of the bearing 48 is in contact with the inner peripheral surface of the bearing holding member 54 that is disposed away from the coil mounting member 41. That is, the bearing 48 is disposed outside the inner peripheral surface of the coil mounting member 41.
  • the bearing 48 is arranged on the shaft 46 so as to be separated from the permanent magnet 45, the magnetic flux from the permanent magnet 45 interlinked with the cylindrical coil 44 does not leak around the bearing. Therefore, the magnetic flux interlinking with the cylindrical coil 44 is reduced, the induced voltage is not reduced, and the energy efficiency of the rotating electrical machine 40 can be increased.
  • the bearings 47 and 48 are disposed at the end of the shaft 46 in the axial direction. Thereby, vibration generated in the rotating electrical machine 40 can be reduced, and a load is distributed to the bearing 48 and the bearing 47, so that the life of the bearing can be extended.
  • the arrangement of the bearings 47 and 48 need not be limited to the above.
  • the outer peripheral surfaces of the bearing 47 and the bearing 48 are in contact with either the inner peripheral surface of the coil mounting member 41 or the inner peripheral surface of the bearing holding member 53 disposed on the inner peripheral side of the coil mounting member 41.
  • the power generating turbine blade 37 is not necessarily between the bearings 47 and 48.
  • the outer peripheral surfaces of the bearing 47 and the bearing 48 may be in contact with the inner peripheral surface of the bearing holding member 54 that is disposed apart from the coil mounting member 41.
  • the bearings 47 and 48 may not be arranged at the end of the shaft 46 in the axial direction.
  • the shaft 46 may be rotated by a method different from that of the power generation turbine blade 37.
  • the permanent magnet 45 is an Sm—Co sintered anisotropic magnet and is polarized with two poles.
  • the permanent magnet 45 may be an Nd—Fe—B magnet.
  • the permanent magnet 45 may be a bonded magnet instead of a sintered magnet.
  • the permanent magnet 45 may be an isotropic magnet.
  • the permanent magnet 45 may be composed of a plurality of poles of two or more poles.
  • a coil mounting member 41 is disposed on the outer periphery of the permanent magnet 45 through an air gap.
  • the coil mounting member 41 has a cylindrical body 42 at a portion facing the permanent magnet 45, and a cylindrical coil 44 is fixed to the outer peripheral surface of the cylindrical body 42. Further, it is preferable that the thickness of the cylindrical body portion 42 is thin and can ensure strength.
  • the thickness of the cylindrical body portion 42 is preferably, for example, 0.3 mm.
  • drum 42 is not limited above, The thickness of 0.1 mm or more and 0.5 mm or less may be sufficient.
  • the coil mounting member 41 is formed of resin (PPS or the like). In this case, the coil mounting member is preferably molded from a resin having a flexural modulus of 5000 MPa or more.
  • a terminal pin 49 is provided at the end of the coil mounting member 41. Further, a terminal wire of the field coil is attached to one end portion of the terminal pin 49.
  • a yoke 43 is provided at a position facing the outer peripheral side of the cylindrical coil 44.
  • the yoke 43 magnetically connects the magnetic poles of permanent magnets, and is configured by laminating magnetic thin plates such as electromagnetic steel plates.
  • the yoke 43 may be formed of, for example, a single steel ingot magnetic material.
  • An exterior member 50 is provided on the outer peripheral side of the yoke 43. Further, the yoke 43 and the exterior member 50 can be fixed with, for example, an adhesive.
  • the exterior member 50 has a cylindrical shape with both ends opened. In addition, coil mounting members 41 are joined to both side ends of the exterior member 50.
  • the exterior member 50 may be formed of a resin (such as PPS). In this case, the exterior member 50 can be formed of a resin having a flexural modulus of 5000 MPa or more. Thereby, a leakage current can be prevented.
  • the exterior member 50 may be made of, for example, a magnetic material or a metal.
  • the yoke 43 may also serve as the exterior member 50. In this case, since the yoke 43 constitutes the exterior of the rotating electrical machine 40, the portion of the exterior member 50 shown in FIG. In this case, the yoke 43 is configured by laminating magnetic thin plates such as electromagnetic steel plates.
  • the yoke 43 may be formed of, for example, a single steel ingot magnetic material. As described above, even when the yoke 43 forms an exterior, a sealed space constituted by the coil mounting member 41 is formed, and the cylindrical coil 44 is disposed in the sealed space, as in the rotating electrical machine 40 shown in FIG. ing.
  • the coil mounting member 41 is provided with a hole (not shown), and the inside surrounded by the coil mounting member 41 and the exterior member 50 can be filled with a resin such as an epoxy adhesive.
  • the windings are temporarily fixed with tape in order to prevent the winding from being collapsed while being wound around the winding frame.
  • the winding is extracted from the hexagonal winding frame, and then a pair of hexagonal opposing surfaces of the winding extracted from the winding frame is tilted in the axial direction of the winding frame to form a flat plate.
  • the windings of the state where the flat plate is wound around the cylindrical body portion 42 is fixed to the outer circumference with tape.
  • the winding of conditions in tabular, after wound around the cylindrical body portion 42 may be fixed to the outer periphery with an adhesive.
  • a substantially entire surface of the inner peripheral surface of the cylindrical body portion 42 and the cylindrical coil 44 may be adhesively secured.
  • the cylindrical coil 44 is not deformed even if vibration, impact, or temperature changes, and the reliability of the rotating electrical machine can be increased.
  • the clearance between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical coil 44 and the clearance between the outer peripheral surface of the cylindrical body 42 and the inner peripheral surface of the yoke 43 are reduced. Can be small. Therefore, it is possible to reduce the gap between the permanent magnet 45 and the yoke 43, it is possible to increase the energy efficiency of the rotating electric machine.
  • the annealing operation for heating the self-bonding resin of the winding 62 can be omitted.
  • the cylindrical coil 44 is fixed to the outer peripheral surface of the cylindrical body 42 and is disposed in a sealed space formed by the coil mounting member 41 and the exterior member 50. Since the cylindrical coil 44 can be reduced in thickness in the radial direction as compared with the air-core coil, the gap between the outer diameter of the cylindrical body portion 42 and the inner diameter of the yoke 43 can be reduced, and the volume of the sealed space of the coil can be reduced. . Therefore, deformation and breakage of the cylindrical body portion 42 due to air expansion can be prevented. Moreover, since the deformation
  • the coil mounting member 41 at a bending modulus 5000MPa or more resins can be finished with high accuracy. Further, the cylindrical body portion 42 can be processed into a thin wall. Therefore, it is possible to reduce the gap between the permanent magnet 45 and the yoke 43, it is possible to increase the energy efficiency of the rotating electric machine.
  • the air in the sealed space can be reduced. Therefore, it is possible to air at a high temperature of sterilization to prevent deformation or breakage of the cylindrical body portion 42 also expands. Moreover, since the deformation
  • the cylindrical coil 44 is thin and uniform in thickness, the filled resin is also thin and uniform in the radial direction. Therefore, a gap is generated in the sealed space, and high-temperature and high-pressure steam enters the resin portion covering the cylindrical coil 44, so that deformation and breakage of the cylindrical body portion 13 can be prevented even if the resin swells. Furthermore, since deformation is suppressed even if the thickness of the cylindrical body portion 42 is reduced, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased. Further, the coil mounting member 41 has a thickness in the radial direction at the end portion in the axial direction larger than a thickness in the radial direction of the cylindrical body portion 42.
  • the coil mounting member 41 is constituted by an outer diameter large diameter portion whose axial end is larger than the outer diameter of the cylindrical body portion 42.
  • the axial direction edge part of the coil mounting member 41 is comprised by the outer diameter large diameter part, as for the axial direction edge part of the coil mounting member 41, radial thickness is larger than the radial thickness of the cylindrical trunk
  • the axial end of the coil mounting member 41 has an outer diameter smaller diameter portion smaller than the outer diameter of the cylindrical barrel portion 42, an inner diameter larger diameter portion larger than the inner diameter of the cylindrical barrel portion 42, or the cylindrical barrel portion 42. You may be comprised by the internal diameter small diameter part smaller diameter than an internal diameter.
  • the radial thickness of the axial end of the coil mounting member 41 is thicker than the radial thickness of the cylindrical body 42, the rigidity of the cylindrical body 42 is increased, and deformation of the cylindrical body 42 is caused by the coil mounting. Since it is restrained at the axial end of the member 41, the cylindrical body 42 can be made thin. Further, since the deformation of the cylindrical body 42 is suppressed, the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body 42 and the outer peripheral surface of the cylindrical body 42 and the yoke 43 are reduced. The gap on the inner peripheral surface of the can be reduced. Therefore, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
  • the one end part of the axial direction of the coil mounting member 41 is thicker than the cylindrical trunk
  • the cylindrical coil 44, a cylindrical body portion 42 on the inner peripheral side is disposed, it is possible to arrange the yoke 43 on the outer peripheral side.
  • the radial length of the yoke 43 is set longer than the radial length of the cylindrical body portion 42.
  • the yoke 43 having a longer length in the radial direction than the cylindrical body 42 can reduce the deformation amount with respect to, for example, bending stress that deforms the cylindrical body 42. Therefore, even if the cylindrical body 42 is thin, deformation can be suppressed.
  • the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body portion 42 and the outer peripheral surface of the cylindrical body portion 42 and the yoke are reduced.
  • the clearance with the inner peripheral surface of 43 can be reduced. Therefore, it is possible to reduce the gap between the permanent magnet 45 and the yoke 43, it is possible to increase the energy efficiency of the rotating electric machine.
  • a flat coil 62 is wound around the cylindrical body 42 and fixed with tape. Therefore, the gap between the cylindrical body portion 42 and the cylindrical coil 44 can be reduced by the amount of the gap to be inserted, rather than inserting a cylindrical coil formed in a cylindrical shape in advance. Furthermore, since the cylindrical coil 44 is formed into the cylindrical shape of the cylindrical body portion 42, the cylindrical shape of the cylindrical coil 44 can be formed with high accuracy, and the outer peripheral surface of the cylindrical body portion 42 and the inner peripheral surface of the yoke 43 can be formed. Can be made smaller.
  • the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased, rather than forming a cylindrical shape in advance and inserting the cylindrical coil into the cylindrical body. Further, the annealing operation of the cylindrical coil, which is troublesome and has poor workability, can be omitted.
  • the cylindrical coil 44 includes a linear conductor portion along the longitudinal direction of the permanent magnet.
  • the linear conductor portion of the turtle shell winding has a part of the winding on the cylindrical shaft.
  • the linear conductor portion in the cylindrical axis direction interlinking with the magnetic flux exists in the central portion of the cylindrical winding, and the induced electromotive force can be effectively generated. Therefore, the power generation is efficiently performed while reducing the overall size. be able to.
  • FIG. 8 is a diagram showing another embodiment of the rotating electrical machine.
  • the rotating electrical machine 40 is electrically connected to the outside through a terminal 49, and is rotated to induce a cylindrical coil 44 that generates an induced electromotive force.
  • the rotor 20 generates an electromotive force, and a yoke 73 and the like in which each of these members is housed.
  • the yoke also serves as an exterior member.
  • the yoke and the exterior member shown in FIG. 2 may be provided.
  • the rotor 20 includes a cylindrical permanent magnet 45 and a rotating shaft 46, and is rotatably supported between two points by bearings 47 and 48 disposed at the center positions of the bearing holding members 77 and 78.
  • a shaft 46 is fixed through the center of the permanent magnet 45 along the longitudinal direction.
  • the yoke 73 has a cylindrical shape with both ends opened, and magnetically connects the magnetic poles of permanent magnets, and is configured by laminating magnetic thin plates such as electromagnetic steel plates.
  • the yoke 73 may be formed of, for example, a single steel ingot magnetic material. As a result, the yoke 73 can also serve as an exterior member.
  • a coil mounting member 41 is joined to one end side of the yoke 73.
  • the coil mounting member 41 has a cylindrical body portion 42 that faces the permanent magnet 45.
  • a cylindrical coil 44 is fixed to the outer peripheral surface of the cylindrical body portion 42.
  • the coil mounting member 41 is made of a resin (PPS (polyphenylene sulfide) or the like).
  • the coil mounting member 41 may be made of a resin having a flexural modulus of 5000 MPa or more. When the coil mounting member 41 is made of resin, an eddy current is not generated and an effect of reducing loss can be obtained.
  • the coil mounting member may be made of a nonmagnetic metal such as aluminum or brass.
  • the other end side of the yoke 73 and the end of the coil mounting member 41 have an annular opening, and a lid 71 to which a terminal pin 49 is attached is fitted so as to close the annular opening.
  • the lid 71 is provided with a hole (not shown), and an epoxy adhesive is filled into the inside surrounded by the coil mounting member 41, the yoke 73 and the lid 71 through the hole.
  • the lid 71 may be formed integrally with the coil mounting member 41.
  • the coil mounting member 41 is provided with a hole (not shown), and the inside surrounded by the coil mounting member 41 and the yoke 73 can be filled with the epoxy adhesive from the hole.
  • the coil mounting member 41 has a thickness in the radial direction at the end portion in the axial direction that is greater than a thickness in the radial direction of the cylindrical body portion 42.
  • the coil mounting member 41 is configured by an outer diameter large diameter portion whose both ends in the axial direction are larger than the outer diameter of the cylindrical body portion 42 and an outer diameter small diameter portion whose diameter is smaller than the outer diameter of the cylindrical body portion 42. Yes.
  • the axial direction edge part of the coil mounting member 41 is comprised by the outer diameter large diameter part and the outer diameter small diameter part, the axial direction edge part of the coil mounting member 41 has radial thickness of the cylindrical trunk
  • the end portion in the axial direction of the coil mounting member 41 may be constituted by an inner diameter large diameter portion larger than the inner diameter of the cylindrical body portion 42 or an inner diameter small diameter portion smaller than the inner diameter of the cylindrical body portion 42.
  • the radial thickness of the axial end of the coil mounting member 41 is thicker than the radial thickness of the cylindrical body 42, the rigidity of the cylindrical body 42 is increased, and deformation of the cylindrical body 42 is caused by the coil mounting. Since it is restrained at the axial end of the member 41, the cylindrical body 42 can be made thin. Further, since the deformation of the cylindrical body 42 is suppressed, the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body 42 and the outer peripheral surface of the cylindrical body 42 and the yoke 73 are reduced. The gap on the inner peripheral surface of the can be reduced. Therefore, the gap between the permanent magnet 45 and the yoke 73 can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
  • a bearing holding member 78 is joined to one end side of the inner peripheral surface of the coil mounting member 41, and a bearing holding member 77 is joined to the other end side of the inner peripheral surface of the coil mounting member 41. It is connected to.
  • the permanent magnet 45 and the coil mounting member 41 can be arranged coaxially with high accuracy, and the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body 42 can be reduced. Therefore, since the gap between the permanent magnet 45 and the yoke 73 can be reduced, the energy efficiency of the rotating electrical machine can be increased.
  • the arrangement of the bearings 47 and 48 need not be limited to the above. That is, the bearings 47 and 48 may be in the same positions as in the embodiment shown in FIG.
  • the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
  • the winding frame is not limited to a hexagon, and needless to say, it may be a polygon.
  • the generator of the rotating electrical machine has been described. However, for example, it is also possible to use a motor that rotates a permanent magnet by supplying alternating current to three-phase coils so as to sequentially switch.

Abstract

Provided is a high-efficient rotating electric machine available for medical use. The rotating electric machine is provided with a permanent magnet (45) configured by arranging a plurality of magnetic poles in a circumferential direction at the outer periphery thereof, a coil mounting member (41) having a cylindrical trunk portion (42) at a position facing the permanent magnet (34) with an air gap therebetween, a cylindrical coil (44) configured by affixing a planar coil, which is formed by bringing down a coil wound in a predetermined direction in the predetermined direction, to the entire surface of the outer periphery of the cylindrical trunk portion (42) in such a manner that the planar coil has an annular shape, a yoke (43) produced from a magnetic material at a position facing the outer periphery of the cylindrical coil (44), and an armoring member (50) provided with the yoke (43) at the inner periphery side thereof, and the cylindrical coil (44) is disposed in an enclosed space configured by the coil mounting member (41) and the armoring member (50).

Description

回転電機、及び歯科用又は医療用のハンドピースRotating electric machine and dental or medical handpiece
　本発明は、医療機器や精密測定装置などに利用される円筒型コイルを用いたコアレスタイプのモータ、または発電機とされる回転電機、及び回転電機を備えた歯科用又は医療用のハンドピースに関するものである。 The present invention relates to a coreless type motor using a cylindrical coil used for medical equipment, precision measuring devices, etc., or a rotating electrical machine to be a generator, and a dental or medical handpiece provided with the rotating electrical machine. Is.
　医療機器、特に外科手術や歯科医療等の現場で用いられる医療機器は、細菌、ウィルス等が当該機器を介して患者に感染することを防止するために、使用の前後に例えば高温加圧蒸気による滅菌処理が施される。従って、上記医療機器に組み込まれるモータは小型化を図りつつ高温加圧蒸気に耐え得る構成にする必要がある。これに対応するものとして、永久磁石の外周面と隙間を介して対向配置されるケースの間に複数の空芯コイルを配置し、空芯コイルの内周側にシートを備えることにより空芯コイルを空気と遮断する、または、空芯コイルを樹脂でモールドするモータが知られている（特許文献１）。 In order to prevent bacteria, viruses, etc. from infecting patients through the equipment, medical equipment, particularly medical equipment used in the field such as surgery and dentistry, is used by, for example, high-temperature pressurized steam before and after use. Sterilization is performed. Therefore, the motor incorporated in the medical device must be configured to withstand high temperature pressurized steam while reducing the size. Corresponding to this, a plurality of air-core coils are arranged between cases arranged opposite to the outer peripheral surface of the permanent magnet via a gap, and an air-core coil is provided by providing a sheet on the inner peripheral side of the air-core coil. There is known a motor that blocks air from air or molds an air-core coil with resin (Patent Document 1).
　このモータは、空芯コイル内周側のシートが薄肉のため、永久磁石とケースの隙間を小さくできて、大きなトルクを発生することができる。 This motor has a thin sheet on the inner circumference side of the air-core coil, so that the gap between the permanent magnet and the case can be reduced, and a large torque can be generated.
　一般に、モータは、高トルクの発生を目的に、このコイルに鎖交する磁束を多くするように形成するため、永久磁石とヨークとの隙間を小さく設定する必要がある。つまり、永久磁石とヨークとの隙間を小さくして永久磁石の磁束密度を大きく保ち、隙間における有効磁束が多くなるようにする。それによって、モータの発生トルクが大きくなって、モータのエネルギー効率が高くなる。逆に、隙間が大きいと、コイルに鎖交する永久磁石の磁束が少なくなり、モータの発生トルクが小さくなる。 Generally, in order to generate a high torque, the motor is formed so as to increase the magnetic flux linked to this coil, and therefore it is necessary to set a small gap between the permanent magnet and the yoke. That is, the gap between the permanent magnet and the yoke is reduced to keep the magnetic flux density of the permanent magnet high, and the effective magnetic flux in the gap is increased. Thereby, the generated torque of the motor is increased, and the energy efficiency of the motor is increased. Conversely, if the gap is large, the magnetic flux of the permanent magnets interlinking the coil is reduced, the generated torque of the motor is reduced.
特開２００４－１８０４５７号公報JP 2004-180457 A
　上述のモータは、図９に示すように、シートの外周面に複数の空芯コイルが周方向に並んで取り付けられ、空芯コイルはシートで覆われて外気と遮断されている。滅菌処理のための高温環境下ではシートで覆われた内部の空気が膨張してシートが変形してしまう。また、空芯コイルは、自己融着線が略短形の空芯状に巻回されて形成されており、コイル部１０２と空芯部１０３からなる複数の空芯コイル１０１が周方向に配列されている。また、空芯コイル１０１は、空芯部１０３の空間、及び１つのコイル部１０２と他のコイル部１０２との間に空間がある。この場合、空芯コイルを樹脂でモールドした場合は、樹脂層が空芯コイルのコイル部で薄く、空芯部、及び１つのコイル部と他のコイル部の間は厚くなってしまう。そのため、モータが高温加圧蒸気の雰囲気中に放置されて、樹脂が膨潤すると、樹脂の厚いところほど体積が大きく膨張してシートを変形させてしまう。そのため、シートの変形によって、シートと永久磁石が接触してしまうという問題がある。 As shown in FIG. 9, in the motor described above, a plurality of air-core coils are attached to the outer peripheral surface of the seat side by side in the circumferential direction, and the air-core coils are covered with the seat and are shielded from the outside air. In a high temperature environment for sterilization, the air inside the sheet is expanded and the sheet is deformed. The air-core coil is formed by winding a self-bonding wire into a substantially short air-core shape, and a plurality of air-core coils 101 including the coil portion 102 and the air-core portion 103 are arranged in the circumferential direction. Has been. The air-core coil 101 has a space between the air-core portion 103 and a space between one coil portion 102 and another coil portion 102. In this case, when the air-core coil is molded with resin, the resin layer is thin at the coil portion of the air-core coil, and the air-core portion and the space between one coil portion and the other coil portion are thick. Therefore, if the motor is left in the atmosphere of high-temperature and pressurized steam and the resin swells, the thicker the resin is, the larger the volume expands and the sheet is deformed. Therefore, there exists a problem that a sheet | seat and a permanent magnet will contact by deformation | transformation of a sheet | seat.
　また、シートが変形しても永久磁石に接触しないようにするためには、シートの肉厚を厚くして変形を防止するか、またはシートと永久磁石の空隙を広くする必要がある。これにより、永久磁石とヨークの隙間が大きくなって、磁石の磁界内の磁束が小さくなり、モータの発生トルクが小さくなってしまうという問題がある。 Also, in order to prevent the sheet from coming into contact with the permanent magnet even if the sheet is deformed, it is necessary to increase the thickness of the sheet to prevent the deformation, or to widen the gap between the sheet and the permanent magnet. As a result, there is a problem that the gap between the permanent magnet and the yoke is increased, the magnetic flux in the magnetic field of the magnet is reduced, and the torque generated by the motor is reduced.
　また、複数の空芯コイルを周方向に配置するため、各コイルの配置ピッチにばらつきが生じる。そのため、励磁するタイミングがずれてモータの発生トルクが小さくなってしまうという問題がある。
本発明は上述した事情に鑑みてなされたものであって、高温加圧蒸気による滅菌処理を行っても利用可能で、エネルギー効率を高くすることができる回転電機を提供することを目的とする。 Further, since the plurality of air-core coils are arranged in the circumferential direction, the arrangement pitch of each coil varies. Therefore, there is a problem that the excitation timing is shifted and the generated torque of the motor is reduced.
This invention is made | formed in view of the situation mentioned above, Comprising: It aims at providing the rotary electric machine which can be utilized even if it performs the sterilization process by high temperature pressurization steam, and can make energy efficiency high.
　上記目的を達成するために、本発明に係る回転電機は、外周に複数の磁極を周方向に配列してなる永久磁石と、前記永久磁石とエアーギャップを介して対向した位置に円筒胴部を有するコイル装着部材と、所定方向に巻回されたコイルを前記所定方向に倒した平板状コイルであり、前記平板状コイルが円環状となるように前記円筒胴部の外周部に固定された円筒型コイルと、前記円筒型コイルの外周部と対向した位置に備えられた磁性材料からなるヨークとを備え、前記円筒型コイルは、前記コイル装着部材で構成された密閉空間に配置されていることを特徴とする。
コイルが密閉空間に配置され、かつ密閉空間の体積が大きい場合、滅菌処理の高温により空気が膨張して、コイル装着部材が変形や破損をしてしまう。
しかし、本発明の円筒型コイルは多角形状に巻いたコイルを円筒状に一様に配列しており、空芯コイルよりも巻線を密に巻くことができるので、コイルの径方向厚みを薄くできる。そのため、コイルの密閉空間の体積が小さくできて、空気の膨張によるコイル装着部材の変形や破損を防止できる。また、コイル装着部材の変形を防止できるので、コイル装着部材の円筒胴部の厚みを薄くすることができる。したがって、永久磁石とヨークの隙間を小さくできて、回転電機のエネルギー効率を高くすることができる。
また、円筒型コイルは、空芯コイルよりコイルの電線数を多くすることができる。そのため、円筒型コイルは、径方向に電線を重ねる電線の層が少なくても、必要なコイル電線数を配置することができる。
また、本発明に係る回転電機は、前記ヨークの外周側に備えられた外装部材を備えることを特徴とする。 In order to achieve the above object, a rotating electrical machine according to the present invention includes a permanent magnet having a plurality of magnetic poles arranged in the circumferential direction on the outer periphery, and a cylindrical body at a position facing the permanent magnet via an air gap. A coil mounting member, and a flat plate coil in which a coil wound in a predetermined direction is tilted in the predetermined direction, and a cylinder fixed to an outer peripheral portion of the cylindrical body so that the flat plate coil has an annular shape And a yoke made of a magnetic material provided at a position facing the outer peripheral portion of the cylindrical coil, and the cylindrical coil is disposed in a sealed space constituted by the coil mounting member. It is characterized by.
When the coil is disposed in a sealed space and the volume of the sealed space is large, air expands due to the high temperature of the sterilization process, and the coil mounting member is deformed or damaged.
However, the cylindrical coil of the present invention has a uniform arrangement of coils wound in a polygonal shape in a cylindrical shape, and the winding can be wound more densely than an air-core coil. it can. Therefore, the volume of the sealed space of the coil can be reduced, and deformation and breakage of the coil mounting member due to air expansion can be prevented. Further, since the deformation of the coil mounting member can be prevented, the thickness of the cylindrical body portion of the coil mounting member can be reduced. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
Further, the cylindrical coil can increase the number of electric wires of the coil as compared with the air-core coil. Therefore, a cylindrical coil can arrange | position a required number of coil electric wires, even if there are few layers of the electric wire which piles up an electric wire in radial direction.
The rotating electrical machine according to the present invention includes an exterior member provided on the outer peripheral side of the yoke.
　また、本発明に係る回転電機は、前記密閉空間が、少なくとも前記円筒型コイルを覆う範囲に樹脂が充填されていることを特徴とする。 The rotating electrical machine according to the present invention is characterized in that the sealed space is filled with a resin in a range covering at least the cylindrical coil.
　本発明の構成により、密閉空間の空気を少なくできるため、滅菌処理の高温により空気が膨張しても円筒胴部の変形や破損を防止することができる。また、円筒胴部の変形を防止できるので、円筒胴部の厚みを薄くすることができる。したがって、永久磁石とヨークの隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。 The configuration of the present invention makes it possible to reduce the air in the sealed space, so that deformation and breakage of the cylindrical body can be prevented even if the air expands due to the high temperature of sterilization. Moreover, since the deformation | transformation of a cylindrical trunk | drum can be prevented, the thickness of a cylindrical trunk | drum can be made thin. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
　また、密閉空間に隙間が生じて滅菌処理の高圧蒸気が空芯コイルを覆う樹脂部に侵入した場合、従来技術では、空芯コイルにモールドされた樹脂部は径方向に厚みが一様でないため、空芯コイルの変形や破損を生じる問題がある。
しかし、本発明の円筒型コイルは、コイルの厚みが一様であるため、充填された樹脂の厚みも一様になり、樹脂が膨潤した場合に円筒胴部の変形や破損を防止することができる。さらに、円筒胴部の変形を防止できるので、円筒胴部の厚みを薄くすることができる。したがって、永久磁石とヨークとの隙間を小さくできて、回転電機のエネルギー効率を高くすることができる。 In addition, when a high-pressure steam for sterilization enters the resin part covering the air-core coil due to a gap in the sealed space, the resin part molded in the air-core coil is not uniform in the radial direction in the conventional technology. There is a problem in that the air-core coil is deformed or damaged.
However, since the cylindrical coil of the present invention has a uniform coil thickness, the thickness of the filled resin is also uniform, and when the resin swells, the cylindrical body can be prevented from being deformed or damaged. it can. Furthermore, since the deformation of the cylindrical body can be prevented, the thickness of the cylindrical body can be reduced. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
　また、本発明に係る回転電機は、前記円筒型コイルが、多角形状の巻枠に巻回した巻線を巻枠巻方向に倒して平板状にした後、前記コイル装着部材の前記円筒胴部の外周部に巻き付けて円筒型に成形されたものであり、前記円筒型コイルは、永久磁石の長手方向に沿う直線導体部を備えることを特徴とする。
ここで、円筒型コイルについて説明する。円筒型コイルは、１ターンが多角形状をした巻線を円筒型に配列したコイルであり、大別して以下の３つがある。
（１）亀甲巻（図３（ａ））
（２）菱形巻（図３（ｂ））
（３）ハネカム巻（図３（ｃ））
亀甲巻は、巻線が自己融着線から形成され、加熱等によって巻線の被膜同士が融着固着されて形成される。亀甲巻は円筒軸上に巻線の一部が揃うので、トルクの発生に寄与する円筒軸方向の直線導体部が円筒の巻線の中央部に存在し、磁極の受ける力が有効に回転トルクに働く。そのため、亀甲巻は３つの巻線方式で一番効率が良いとされている。
一方、菱形巻はトルクに寄与する円筒軸方向の直線導体部がなく、全体が傾斜した導体部となっているので、巻線の利用効率が亀甲巻に比べて悪い。そのため、菱形巻は高効率化に際しては、あまり好ましい巻線工法ではない。
また、ハネカム巻は菱形巻と同様にトルクに寄与する円筒軸方向の直線導体部がなく、亀甲巻に比べて巻線の利用効率が悪い。 Further, in the rotating electrical machine according to the present invention, the cylindrical coil is formed into a flat plate by tilting a winding wound around a polygonal winding frame in the winding direction of the winding frame, and then the cylindrical body portion of the coil mounting member. The cylindrical coil is provided with a linear conductor portion along the longitudinal direction of the permanent magnet.
Here, the cylindrical coil will be described. A cylindrical coil is a coil in which windings having a polygonal shape for one turn are arranged in a cylindrical shape, and are roughly classified into the following three types.
(1) Tortoise shell (Figure 3 (a))
(2) Rhombus winding (Figure 3 (b))
(3) Honeycomb winding (Figure 3 (c))
In the turtle shell winding, the winding is formed from a self-bonding wire, and the coating of the winding is fused and fixed by heating or the like. Tortoise shell winding has a part of the winding on the cylindrical shaft, so the linear conductor in the cylindrical axis direction that contributes to the generation of torque exists in the center of the cylindrical winding, and the force received by the magnetic pole effectively rotates the torque. To work. Therefore, Kameaki is considered to be the most efficient with three winding methods.
On the other hand, since the rhombus winding does not have a linear conductor portion in the cylindrical axis direction that contributes to torque and is a conductor portion inclined as a whole, the utilization efficiency of the winding is worse than that of the turtle shell winding. Therefore, the rhombus winding is not a preferable winding method for increasing the efficiency.
In addition, the honeycomb winding does not have a linear conductor portion in the cylindrical axis direction that contributes to torque like the rhombus winding, and the use efficiency of the winding is worse than that of the turtle shell winding.
　以下に、従来の亀甲巻の円筒型コイル作成方法について、図４から図７を参照して説明する。 Hereinafter, a conventional method for producing a cylindrical coil of turtle shell winding will be described with reference to FIGS.
　図４は巻回作業について説明する図である。六角形の巻枠６１に整列の巻線６２を巻回し、巻枠６１に巻回した状態で、巻崩れ防止のためにテープ６３で仮固定する。その状態で、その六角形の巻枠６１から抜き取る。 FIG. 4 is a diagram for explaining the winding work. The aligned winding 62 is wound around the hexagonal winding frame 61, and is temporarily fixed with a tape 63 to prevent the winding from being collapsed while being wound around the winding frame 61. In that state, it is extracted from the hexagonal reel 61.
　図５は平板状作業について説明する図である。巻枠６１から抜き取った巻線６２の六角形の一対の対向面を巻枠軸方向に倒して、平板状にする。 FIG. 5 is a diagram for explaining the flat work. A pair of hexagonal facing surfaces of the winding 62 extracted from the winding frame 61 are tilted in the axial direction of the winding frame to form a flat plate shape.
　図６はカーリング作業について説明する図である。平板状にした巻線をカーリング棒６４に巻き付ける。その際カーリング成形した外周にテープを巻き付ける。
図７はアニール作業について説明する図である。カーリング棒６４を取り外した円筒型コイル６５を加熱し、円筒成形治具で円筒型コイル６５をプレスして円筒度が良くなるように整形する。巻線は自己融着線を使用しているので、加熱することで巻線同士が融着して巻崩れしない。 FIG. 6 is a diagram for explaining the curling work. A flat wire is wound around the curling rod 64. At that time, a tape is wound around the curled outer periphery.
FIG. 7 is a diagram for explaining the annealing operation. The cylindrical coil 65 from which the curling rod 64 has been removed is heated, and the cylindrical coil 65 is pressed with a cylindrical forming jig to be shaped so as to improve the cylindricity. Since the windings use self-bonding wires, the windings are fused together and are not collapsed by heating.
　以上の工程によって亀甲巻の円筒型コイルが作成される。
本発明において、従来行っていたカーリング作業とアニール作業を廃止して、多角形状の巻枠に巻回した巻線を巻枠巻方向に倒して平板状にした後、コイル装着部材の円筒胴部に巻き付けて円筒形状を形成している。そのため、あらかじめ円筒形状に形成した円筒型コイルを円筒胴部に挿入するよりも、円筒胴部と円筒型コイルの隙間が小さくできる。さらに、円筒胴部の円筒形状に倣ってコイルを成形するため、コイルの円筒形状を高精度に形成することができ、円筒胴部外周面とヨークとの隙間を小さく設定することができる。したがって、永久磁石とヨークとの隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。また、多くの手間が掛かって作業性が悪かった円筒コイルの加工の手間を一部省略することができる。
また、本発明に係る回転電機は、前記コイル装着部材が、円筒軸上の端部の径方向の厚さが、前記円筒胴部の径方向の厚さより厚いことを特徴とする。 The turtle shell winding cylindrical coil is created by the above process.
In the present invention, the curling operation and the annealing operation which have been conventionally performed are abolished, the winding wound around the polygonal winding frame is tilted in the winding direction to form a flat plate, and then the cylindrical body of the coil mounting member A cylindrical shape is formed by wrapping around. Therefore, the gap between the cylindrical body and the cylindrical coil can be made smaller than inserting a cylindrical coil formed in a cylindrical shape in advance into the cylindrical body. Furthermore, since the coil is formed following the cylindrical shape of the cylindrical body portion, the cylindrical shape of the coil can be formed with high accuracy, and the gap between the outer surface of the cylindrical body portion and the yoke can be set small. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased. In addition, it is possible to omit part of the labor of processing the cylindrical coil, which has taken much labor and has poor workability.
In the rotating electrical machine according to the present invention, the coil mounting member is characterized in that the radial thickness of the end portion on the cylindrical shaft is thicker than the radial thickness of the cylindrical body portion.
　また、本発明に係る回転電機は、前記コイル装着部材が、前記円筒胴部の円筒軸上の端部に前記円筒胴部の外径よりも大径の外径大径部を備えていることを特徴とする。 In the rotating electrical machine according to the present invention, the coil mounting member includes an outer diameter large diameter portion having a larger diameter than an outer diameter of the cylindrical body portion at an end portion on the cylindrical shaft of the cylindrical body portion. It is characterized by.
　本発明の構成により、円筒胴部を変形させる応力に対して円筒胴部の変形量を小さくすることができるため、円筒胴部が薄肉であっても変形を抑制することができる。また、円筒胴部の変形が抑制されるため、永久磁石外周面と円筒胴部内周面との隙間、および円筒胴部外周面とヨーク内周面との隙間を小さくできる。したがって、永久磁石とヨークとの隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。
また、本発明に係る回転電機は、前記ヨークが、前記ヨークの半径方向長さが前記円筒胴部の半径方向長さよりも長く設定されていることを特徴とする。
また、本発明に係る回転電機は、前記円筒型コイルの内周側に前記円筒胴部が配置されるとともに、前記円筒型コイルの外周側に前記ヨークが配置されることにより、前記円筒型コイルが前記円筒胴部及び前記ヨークにより挟持されていることを特徴とする。
本発明の構成により、半径方向長さが長いヨークは、円筒胴部を変形させる応力に対して変形量を小さくできる。そのため、円筒胴部が薄肉であっても、円筒胴部の変形を抑制することができる。また、円筒胴部の変形が抑制されるため、永久磁石外周面とコイル装着部材の円筒胴部内周面との隙間、およびコイル装着部材の円筒胴部外周面とヨーク内周面との隙間を小さくできる。したがって、永久磁石とヨークとの隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。
また、本発明に係る回転電機は、前記コイル装着部材が、樹脂で形成されていることを特徴とする。
また、本発明に係る回転電機は、前記コイル装着部材が、曲げ弾性率が５０００ＭＰａ以上の樹脂で形成されていることを特徴とする。
本発明の構成により、コイル装着部材が樹脂であるため、永久磁石の磁束を遮ることなくコイルに鎖交させることができる。また、コイル装着部材の曲げ弾性率が５０００ＭＰａ以上の場合、加工時の変形が防止されて高精度に加工できる。そのため、永久磁石外周面とコイル装着部材内周面の隙間、およびコイル装着部材外周面とヨーク内周面の隙間を小さくできる。また、コイル装着部材は切削加工で薄肉に加工できる。したがって、永久磁石とヨークとの隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。
また、本発明に係る回転電機は、前記外装部材が、樹脂で形成されていることを特徴とする。
また、本発明に係る回転電機は、前記外装部材が、曲げ弾性率が５０００ＭＰａ以上の樹脂で形成されていることを特徴とする。
本発明の構成により、外装部材が樹脂であるため、漏れ電流を防ぐことができる。また、外装部材の曲げ弾性率が５０００ＭＰａ以上の場合、加工時の変形が防止されて高精度に加工できる。そのため、永久磁石外周面とコイル装着部材内周面の隙間、およびコイル装着部材外周面とヨーク内周面の隙間を小さくできる。また、外装部材は切削加工で薄肉に加工できる。したがって、永久磁石とヨークとの隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。
また、本発明に係る回転電機は、前記永久磁石が、回転可能な軸に取り付けられており、前記軸の前記永久磁石と異なる位置に配置された軸受を備え、前記軸受の外周面が、前記コイル装着部材から離間して配置された軸受保持部材の内周面に当接していることを特徴とする。
本発明の構成により、円筒型コイルに鎖交する永久磁石からの磁束が軸受に漏れ回ることがないため、円筒型コイルに鎖交する磁束が減少することがなく、回転電機のエネルギー効率を高くすることができる。 With the configuration of the present invention, the amount of deformation of the cylindrical body can be reduced with respect to the stress that deforms the cylindrical body, so that deformation can be suppressed even if the cylindrical body is thin. Further, since the deformation of the cylindrical body portion is suppressed, the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the cylindrical body portion and the gap between the outer peripheral surface of the cylindrical body portion and the inner peripheral surface of the yoke can be reduced. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
The rotating electrical machine according to the present invention is characterized in that the yoke is set such that a radial length of the yoke is longer than a radial length of the cylindrical body.
In the rotating electrical machine according to the present invention, the cylindrical body is disposed on the inner peripheral side of the cylindrical coil, and the yoke is disposed on the outer peripheral side of the cylindrical coil. Is sandwiched between the cylindrical body and the yoke.
According to the configuration of the present invention, the yoke having a long radial length can reduce the deformation amount with respect to the stress that deforms the cylindrical body. Therefore, even if the cylindrical body is thin, deformation of the cylindrical body can be suppressed. Further, since the deformation of the cylindrical body is suppressed, the clearance between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the cylindrical body of the coil mounting member, and the clearance between the outer peripheral surface of the cylindrical body of the coil mounting member and the inner peripheral surface of the yoke are reduced. Can be small. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
The rotating electrical machine according to the present invention is characterized in that the coil mounting member is made of resin.
The rotating electrical machine according to the present invention is characterized in that the coil mounting member is formed of a resin having a flexural modulus of 5000 MPa or more.
With the configuration of the present invention, since the coil mounting member is a resin, the coil can be linked to the coil without blocking the magnetic flux of the permanent magnet. Further, when the bending elastic modulus of the coil mounting member is 5000 MPa or more, deformation during processing is prevented and processing can be performed with high accuracy. Therefore, the clearance between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the coil mounting member and the clearance between the outer peripheral surface of the coil mounting member and the inner peripheral surface of the yoke can be reduced. Further, the coil mounting member can be processed into a thin wall by cutting. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
The rotating electrical machine according to the present invention is characterized in that the exterior member is made of resin.
The rotating electrical machine according to the present invention is characterized in that the exterior member is made of a resin having a flexural modulus of 5000 MPa or more.
With the configuration of the present invention, since the exterior member is a resin, leakage current can be prevented. Moreover, when the bending elastic modulus of an exterior member is 5000 MPa or more, the deformation | transformation at the time of a process is prevented and it can process with high precision. Therefore, the clearance between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the coil mounting member and the clearance between the outer peripheral surface of the coil mounting member and the inner peripheral surface of the yoke can be reduced. Further, the exterior member can be processed into a thin wall by cutting. Therefore, the gap between the permanent magnet and the yoke can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
The rotating electrical machine according to the present invention includes a bearing in which the permanent magnet is attached to a rotatable shaft, and is disposed at a position different from the permanent magnet of the shaft. It is in contact with the inner peripheral surface of a bearing holding member that is disposed away from the coil mounting member.
According to the configuration of the present invention, since the magnetic flux from the permanent magnet interlinked with the cylindrical coil does not leak around the bearing, the magnetic flux interlinked with the cylindrical coil does not decrease, and the energy efficiency of the rotating electrical machine is increased. can do.
　また、本発明に係る回転電機は、前記永久磁石が、回転可能な軸に取り付けられており、前記軸の前記永久磁石と異なる位置に配置された軸受を備え、前記軸受の外周面が、前記コイル装着部材の内周面、または前記コイル装着部材の内周側に配置された軸受保持部材の内周面に当接していることを特徴とする。 The rotating electrical machine according to the present invention includes a bearing in which the permanent magnet is attached to a rotatable shaft, and is disposed at a position different from the permanent magnet of the shaft. It is in contact with the inner peripheral surface of the coil mounting member or the inner peripheral surface of the bearing holding member disposed on the inner peripheral side of the coil mounting member.
　本発明の構成により、永久磁石とコイル装着部材を精度良く同軸に配置することができる。そのため、永久磁石の外周面とコイル装着部材の内周面との隙間を小さくすることができる。したがって、永久磁石とヨークとの隙間を小さくできるため、回転電機のエネルギー効率を高くすることができる。 With the configuration of the present invention, the permanent magnet and the coil mounting member can be accurately and coaxially arranged. Therefore, the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the coil mounting member can be reduced. Therefore, it is possible to reduce a gap between the permanent magnet and the yoke, it is possible to increase the energy efficiency of the rotating electric machine.
　また、本発明に係る回転電機は、前記永久磁石が、回転可能な軸に取り付けられており、前記軸の前記永久磁石と異なる位置に配置された２つの軸受を備え、一方の前記軸受の外周面が、前記コイル装着部材の内周面、またはコイル装着部材の内周側に配置された軸受保持部材の内周面に当接しているとともに、他方の前記軸受の外周面が、前記コイル装着部材から離間して配置されている軸受保持部材の内周面に当接していることを特徴とする。 Further, the rotating electrical machine according to the present invention includes two bearings in which the permanent magnet is attached to a rotatable shaft, and is disposed at a position different from the permanent magnet of the shaft, and the outer periphery of one of the bearings The surface is in contact with the inner peripheral surface of the coil mounting member or the inner peripheral surface of the bearing holding member disposed on the inner peripheral side of the coil mounting member, and the outer peripheral surface of the other bearing is the coil mounting member. It is in contact with the inner peripheral surface of the bearing holding member that is arranged away from the member.
　本発明の構成により、一方の軸受によって永久磁石とコイル装着部材との同軸を高精度に配置させて、永久磁石の外周面とコイル装着部材の内周面との隙間を小さく保つことができる。また、他方の軸受はコイル装着部材から離間した位置に配置することにより、永久磁石の磁束を軸受に漏れ回ることを防止して、回転電機のエネルギー効率を高くすることができる。 According to the configuration of the present invention, the coaxial between the permanent magnet and the coil mounting member can be arranged with high precision by one bearing, and the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the coil mounting member can be kept small. In addition, by disposing the other bearing at a position away from the coil mounting member, it is possible to prevent the magnetic flux of the permanent magnet from leaking around the bearing and to increase the energy efficiency of the rotating electrical machine.
　また、本発明に係る回転電機は、前記軸受が、前記軸の端部に配置されていることを特徴とする。 The rotary electric machine according to the present invention, the bearing, characterized in that it is arranged at the end of the shaft.
　本発明の構成により、回転電機で発生する振動を小さくすることができるとともに、軸受に荷重が配分されて軸受の寿命を長くすることができる。
また、本発明に係る回転電機は、前記軸の前記永久磁石及び前記軸受と異なる位置に配置されたタービン羽根と、前記円筒型コイルと電気的に接続された発光部品と、前記タービン羽根を回転させる流体を供給する給気管と、を備えることを特徴とする歯科用又は医療用のハンドピースに用いることができる。
本発明に係る歯科用又は医療用のハンドピースは、上述した回転電機を備えているので、エネルギー効率が高く、ハンドピースの発光部品の照度を上げることができる。また、ハンドピース自体の低コスト化を図ることができる。 According to the configuration of the present invention, vibration generated in the rotating electrical machine can be reduced, and a load can be distributed to the bearings to extend the life of the bearings.
Further, the rotating electrical machine according to the present invention rotates the turbine blade, the turbine blade disposed at a position different from the permanent magnet and the bearing of the shaft, the light emitting component electrically connected to the cylindrical coil, and the turbine blade. It can be used for a dental or medical handpiece comprising an air supply pipe for supplying a fluid to be supplied.
Since the dental or medical handpiece according to the present invention includes the rotating electrical machine described above, the energy efficiency is high and the illuminance of the light emitting component of the handpiece can be increased. In addition, the cost of the handpiece itself can be reduced.
　本発明に係る回転電機によれば、コイルの密閉空間の体積が小さくできて、空気の膨張によるコイル装着部材の変形や破損を防止できる。また、コイル装着部材の変形を防止できるので、コイル装着部材の円筒胴部の厚みを薄くすることができる。したがって、永久磁石とヨークの隙間を小さくできて、回転電機のエネルギー効率を高くすることができる。 According to the rotating electrical machine according to the present invention, the volume of the closed space of the coil can be reduced, and deformation and breakage of the coil mounting member due to air expansion can be prevented. Further, since the deformation of the coil mounting member can be prevented, the thickness of the cylindrical body portion of the coil mounting member can be reduced. Therefore, it is possible to possible to reduce the gap between the permanent magnet and the yoke, increasing the energy efficiency of the rotating electric machine.
本発明に係る回転電機を歯科治療用ハンドピースに組み込んだ概略断面図である。It is a schematic sectional drawing which incorporated the rotary electric machine concerning this invention in the handpiece for dental treatment. 本発明の回転電機の断面図である。It is sectional drawing of the rotary electric machine of this invention. 円筒コイルの巻線方法を示す図である。It is a figure which shows the winding method of a cylindrical coil. 亀甲巻コイルの巻枠に巻回した巻線の状態を示す図である。It is a figure which shows the state of the coil | winding wound around the winding frame of the turtle shell winding coil. 亀甲巻コイルの平プレスした平フォーミングコイルの図である。It is the figure of the flat forming coil which carried out the flat press of the turtle shell winding coil. 亀甲巻コイルの平フォーミングコイルを治具の棒にカーリングした状態を示す図である。It is a figure which shows the state which curled the flat forming coil of the turtle shell winding coil to the stick | rod of the jig | tool. 亀甲巻コイルを円筒に成形する、円筒成形治具とカーリングしたコイルを示す図である。It is a figure which shows the coil formed by the cylindrical shaping | molding jig | tool and the curling coil which shape | molds a turtle shell winding coil in a cylinder. 本発明の回転電機の断面図である。It is sectional drawing of the rotary electric machine of this invention. 空芯コイルを円周方向に配置した図である。It is the figure which has arrange | positioned the air-core coil to the circumferential direction.
　以下、本発明の一実施形態に係る回転電機、および歯科治療用ハンドピースの実施形態を図１及び図２を参照して説明する。
図１に示すように、歯科治療用ハンドピース１は、治療用工具２２を軸線Ｌ回りに回転駆動する工具用タービン２１と、該工具用タービン２１を回転自在に保持するヘッド部２と、操作者によって把持される把持部３と、から構成される。
把持部３は、後端部に給気管５１および給水管５２が前方に延びている。後段ハウジング３８内には、回転電機４０が備えられている。また、本実施形態において、回転電機４０は、発電機として用いられている。なお、本実施形態において、回転電機は、歯科治療用ハンドピースに備えられる形態を示したが、これに限定されず、他の形態にも用いることができる。
回転電機４０の円筒軸中心には、軸受４７，４８により回転自在に支持された軸４６が備えられている。また、軸受４８は、前段ハウジング３９側に配置された軸受保持部材５４に保持されている。また、軸受４７は、コイル装着部材４１に嵌合される軸受保持部材５３に保持されている。また、軸受４８及び軸受４７は永久磁石の磁束の影響を受けないものが好ましい。この場合、例えば銅を主成分とする含油軸受などが好ましい。また、軸４６の外周面に永久磁石４５が備えられている。また、永久磁石４５とエアーギャップを介してコイル装着部材４１が配置されている。コイル装着部材４１の外周面に円筒型コイル４４が備えられている。また、円筒型コイル４４の外周と対向した位置にヨーク４３が備えられている。また、軸４６の前方には発電用タービン羽根３７が設けられている。なお、図１において、軸受４７，４８の間に発電用タービン羽根３７と永久磁石４５が設けられているが、発電用タービン羽根３７は、必ずしも軸受４７、４８の間になくてもよい。この場合、発電用タービン羽根３７は、軸４６において永久磁石４５と軸受４７，４８とを配置された位置と異なる位置に配置されていればよい。例えば、発電用タービン羽根３７は、軸４６において軸受４８よりも外側の方に配置されていてもよい。
給気管５１から供給されてきた空気流は、前段ハウジング３９に設けられた導入ノズルで空気が絞られて発電用タービン３７に導入され、軸４６を回転させる。軸４６の外周面に備えられた永久磁石４５は、軸と一体となって回転し、円筒型コイル４４に誘起電圧を発生させる。円筒型コイル４４に発生した電圧は、端子ピン４９を介して電線３２を通ってＬＥＤ３１につながり、ＬＥＤ３１を点灯させることができる。
発電用タービン羽根３７に導入された空気などの流体は、タービン前方に排出され、エアー通路３３を通って工具用タービン２１に導入されて、治療用工具２２を回転させる。
図２は図１に示す回転電機４０の断面図である。図２に示すように、回転電機４０は、円筒軸中心に軸４６を備えている。また、軸４６の外周面に永久磁石４５が回転可能に設けられている。また、軸受４７及び軸受４８は、軸４６において永久磁石４５と異なる位置に配置されている。本実施例の場合、軸受４７及び軸受４８は、軸４６において永久磁石４５より端部側に配置されている。
軸受４７の外周面は、コイル装着部材４１の内周側に配置された軸受保持部材５３の内周面に当接している。この場合、軸受４７の外周面がコイル装着部材４１の内周側に配置された軸受保持部材５３の内周面に当接しているため、永久磁石４５とコイル装着部材４１を精度良く同軸に配置することができ、永久磁石４５の外周面とコイル装着部材４１の内周面との隙間を小さくできる。したがって、永久磁石４５とヨーク４３との隙間を小さくできるため、回転電機４０のエネルギー効率を高くすることができる。なお、軸受４７は、必ずしも軸受保持部材５３の内周面に当接している必要はなく、コイル装着部材４１の内周面に直接当接されていれてもよい。
軸受４８の外周面は、コイル装着部材４１から離間して配置された軸受保持部材５４の内周面に当接している。すなわち、軸受４８は、コイル装着部材４１の内周面の外部に配置されている。この場合、軸受４８は、軸４６において永久磁石４５から離間して配置されているため、円筒型コイル４４に鎖交する永久磁石４５からの磁束が軸受に漏れ回ることがない。そのため、円筒型コイル４４に鎖交する磁束が減少して誘起電圧が小さくならず、回転電機４０のエネルギー効率を高くすることができる。 Hereinafter, an embodiment of a rotating electrical machine and a dental treatment handpiece according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, a dental treatment handpiece 1 includes a tool turbine 21 that rotationally drives a treatment tool 22 around an axis L, a head portion 2 that rotatably holds the tool turbine 21, and an operation. It is comprised from the holding part 3 hold | gripped by a person.
The grip portion 3 has an air supply pipe 51 and a water supply pipe 52 extending forward at the rear end. A rotating electrical machine 40 is provided in the rear housing 38. Moreover, in this embodiment, the rotary electric machine 40 is used as a generator. In addition, in this embodiment, although the rotary electric machine showed the form with which the handpiece for dental treatment was equipped, it is not limited to this, It can use also for another form.
A shaft 46 that is rotatably supported by bearings 47 and 48 is provided at the center of the cylindrical shaft of the rotating electrical machine 40. The bearing 48 is held by a bearing holding member 54 disposed on the front housing 39 side. The bearing 47 is held by a bearing holding member 53 that is fitted to the coil mounting member 41. The bearing 48 and the bearing 47 are preferably not affected by the magnetic flux of the permanent magnet. In this case, for example, an oil-impregnated bearing mainly composed of copper is preferable. A permanent magnet 45 is provided on the outer peripheral surface of the shaft 46. A coil mounting member 41 is disposed via the permanent magnet 45 and the air gap. A cylindrical coil 44 is provided on the outer peripheral surface of the coil mounting member 41. A yoke 43 is provided at a position facing the outer periphery of the cylindrical coil 44. A power generation turbine blade 37 is provided in front of the shaft 46. In FIG. 1, the power generation turbine blade 37 and the permanent magnet 45 are provided between the bearings 47 and 48, but the power generation turbine blade 37 is not necessarily between the bearings 47 and 48. In this case, the power generation turbine blade 37 may be disposed at a position different from the position where the permanent magnet 45 and the bearings 47 and 48 are disposed on the shaft 46. For example, the power generation turbine blade 37 may be disposed on the shaft 46 on the outer side of the bearing 48.
The air flow supplied from the air supply pipe 51 is throttled by the introduction nozzle provided in the front housing 39 and introduced into the power generation turbine 37 to rotate the shaft 46. The permanent magnet 45 provided on the outer peripheral surface of the shaft 46 rotates integrally with the shaft and generates an induced voltage in the cylindrical coil 44. The voltage generated in the cylindrical coil 44 is connected to the LED 31 through the electric wire 32 via the terminal pin 49, and the LED 31 can be turned on.
The fluid such as air introduced into the power generation turbine blade 37 is discharged forward of the turbine and introduced into the tool turbine 21 through the air passage 33 to rotate the treatment tool 22.
FIG. 2 is a cross-sectional view of the rotating electrical machine 40 shown in FIG. As shown in FIG. 2, the rotating electrical machine 40 includes a shaft 46 at the center of the cylindrical axis. A permanent magnet 45 is rotatably provided on the outer peripheral surface of the shaft 46. Further, the bearing 47 and the bearing 48 are arranged at positions different from the permanent magnet 45 on the shaft 46. In the case of the present embodiment, the bearing 47 and the bearing 48 are disposed on the end side of the permanent magnet 45 in the shaft 46.
The outer peripheral surface of the bearing 47 is in contact with the inner peripheral surface of the bearing holding member 53 disposed on the inner peripheral side of the coil mounting member 41. In this case, since the outer peripheral surface of the bearing 47 is in contact with the inner peripheral surface of the bearing holding member 53 disposed on the inner peripheral side of the coil mounting member 41, the permanent magnet 45 and the coil mounting member 41 are accurately and coaxially disposed. The gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the coil mounting member 41 can be reduced. Therefore, since the gap between the permanent magnet 45 and the yoke 43 can be reduced, the energy efficiency of the rotating electrical machine 40 can be increased. The bearing 47 is not necessarily in contact with the inner peripheral surface of the bearing holding member 53, and may be in direct contact with the inner peripheral surface of the coil mounting member 41.
The outer peripheral surface of the bearing 48 is in contact with the inner peripheral surface of the bearing holding member 54 that is disposed away from the coil mounting member 41. That is, the bearing 48 is disposed outside the inner peripheral surface of the coil mounting member 41. In this case, since the bearing 48 is arranged on the shaft 46 so as to be separated from the permanent magnet 45, the magnetic flux from the permanent magnet 45 interlinked with the cylindrical coil 44 does not leak around the bearing. Therefore, the magnetic flux interlinking with the cylindrical coil 44 is reduced, the induced voltage is not reduced, and the energy efficiency of the rotating electrical machine 40 can be increased.
　また、軸受４７，４８は、軸４６の軸方向の端部に配置されている。これにより、回転電機４０で発生する振動を小さくすることができるとともに、軸受４８と軸受４７に荷重が配分されて軸受の寿命を長くすることができる。 Further, the bearings 47 and 48 are disposed at the end of the shaft 46 in the axial direction. Thereby, vibration generated in the rotating electrical machine 40 can be reduced, and a load is distributed to the bearing 48 and the bearing 47, so that the life of the bearing can be extended.
　なお、軸受４７，４８の配置は上記に限定される必要はない。例えば、軸受４７及び軸受４８の外周面が、コイル装着部材４１の内周面、またはコイル装着部材４１の内周側に配置された軸受保持部材５３の内周面のいずれかに当接していてもよい。この場合、発電用タービン羽根３７は、必ずしも軸受４７、４８の間になくてもよい。また、軸受４７及び軸受４８の外周面は、コイル装着部材４１から離間して配置された軸受保持部材５４の内周面に当接していてもよい。また、軸受４７，４８が軸４６の軸方向の端部に配置されていなくてもよい。これらの場合においても、円筒型コイル４４の全面がコイル装着部材４１の円筒胴部４２の外周面に固定されているため、円筒型コイル４４と永久磁石４５の接触を防止するとともに、円筒型コイル４４の変形を防止できるため、永久磁石４５の外周面とコイル装着部材４１の内周面の隙間、およびコイル装着部材４１の外周面とヨーク４３の内周面の隙間を小さくできる。したがって、これらの場合においても、永久磁石４５とヨーク４３との隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。また、軸４６は、発電用タービン羽根３７と異なる方法で回転させてもよい。
永久磁石４５はＳｍ－Ｃｏ焼結の異方性磁石で２極の着磁がされている。また、永久磁石４５はＮｄ－Ｆｅ－Ｂ磁石を用いてもよい。また、永久磁石４５は、焼結磁石ではなく、ボンド磁石を用いてもよい。また、永久磁石４５は、等方性磁石を用いてもよい。また、永久磁石４５は、２極以上の複数の極で構成されていてもよい。
また、永久磁石４５の外周にはエアーギャップを介してコイル装着部材４１が配置されている。コイル装着部材４１は、永久磁石４５と対向する部分に円筒胴部４２を有しており、円筒胴部４２の外周面に円筒型コイル４４が固定されている。また、円筒胴部４２の厚さは、強度が確保でき、かつ薄いことが好ましい。この場合、円筒胴部４２の厚さは、例えば０．３ｍｍが好ましい。なお、円筒胴部４２の厚さは、上記に限定されず、０．１ｍｍ以上０．５ｍｍ以下の厚さでもよい。また、コイル装着部材４１は樹脂（ＰＰＳなど）で成形されている。この場合、コイル装着部材は、曲げ弾性率が５０００ＭＰａ以上の樹脂で成形されることが好ましい。コイル装着部材４１の端部には端子ピン４９が備えられている。さらに、端子ピン４９の一端部に界磁コイルの端末線が取り付けられている。
円筒型コイル４４の外周側と対向する位置にヨーク４３が備えられている。ヨーク４３は、永久磁石の磁極同士を磁気的に接続するもので、電磁鋼鈑などの磁性の薄板を積層して構成されている。なお、ヨーク４３は、例えば単一鋼塊の磁性材料で形成されてもよい。
ヨーク４３の外周側に外装部材５０が備えられている。また、ヨーク４３と外装部材５０とは例えば接着剤などで固定することができる。 The arrangement of the bearings 47 and 48 need not be limited to the above. For example, the outer peripheral surfaces of the bearing 47 and the bearing 48 are in contact with either the inner peripheral surface of the coil mounting member 41 or the inner peripheral surface of the bearing holding member 53 disposed on the inner peripheral side of the coil mounting member 41. Also good. In this case, the power generating turbine blade 37 is not necessarily between the bearings 47 and 48. Further, the outer peripheral surfaces of the bearing 47 and the bearing 48 may be in contact with the inner peripheral surface of the bearing holding member 54 that is disposed apart from the coil mounting member 41. Further, the bearings 47 and 48 may not be arranged at the end of the shaft 46 in the axial direction. Also in these cases, since the entire surface of the cylindrical coil 44 is fixed to the outer peripheral surface of the cylindrical body portion 42 of the coil mounting member 41, contact between the cylindrical coil 44 and the permanent magnet 45 is prevented and the cylindrical coil is prevented. 44 can be prevented, the clearance between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the coil mounting member 41 and the clearance between the outer peripheral surface of the coil mounting member 41 and the inner peripheral surface of the yoke 43 can be reduced. Therefore, also in these cases, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased. Further, the shaft 46 may be rotated by a method different from that of the power generation turbine blade 37.
The permanent magnet 45 is an Sm—Co sintered anisotropic magnet and is polarized with two poles. The permanent magnet 45 may be an Nd—Fe—B magnet. The permanent magnet 45 may be a bonded magnet instead of a sintered magnet. The permanent magnet 45 may be an isotropic magnet. The permanent magnet 45 may be composed of a plurality of poles of two or more poles.
A coil mounting member 41 is disposed on the outer periphery of the permanent magnet 45 through an air gap. The coil mounting member 41 has a cylindrical body 42 at a portion facing the permanent magnet 45, and a cylindrical coil 44 is fixed to the outer peripheral surface of the cylindrical body 42. Further, it is preferable that the thickness of the cylindrical body portion 42 is thin and can ensure strength. In this case, the thickness of the cylindrical body portion 42 is preferably, for example, 0.3 mm. In addition, the thickness of the cylindrical trunk | drum 42 is not limited above, The thickness of 0.1 mm or more and 0.5 mm or less may be sufficient. The coil mounting member 41 is formed of resin (PPS or the like). In this case, the coil mounting member is preferably molded from a resin having a flexural modulus of 5000 MPa or more. A terminal pin 49 is provided at the end of the coil mounting member 41. Further, a terminal wire of the field coil is attached to one end portion of the terminal pin 49.
A yoke 43 is provided at a position facing the outer peripheral side of the cylindrical coil 44. The yoke 43 magnetically connects the magnetic poles of permanent magnets, and is configured by laminating magnetic thin plates such as electromagnetic steel plates. The yoke 43 may be formed of, for example, a single steel ingot magnetic material.
An exterior member 50 is provided on the outer peripheral side of the yoke 43. Further, the yoke 43 and the exterior member 50 can be fixed with, for example, an adhesive.
　外装部材５０は、両端が開口した円筒形状を有している。また、外装部材５０の両側端部には、コイル装着部材４１が接合されている。外装部材５０は、樹脂（ＰＰＳなど）で成形されてもよい。この場合、外装部材５０は、曲げ弾性率が５０００ＭＰａ以上の樹脂で成形することができる。これにより、漏れ電流を防ぐことができる。なお、外装部材５０は、例えば磁性材料、金属で構成されていてもよい。
なお、ヨーク４３が外装部材５０を兼ねてもよい。この場合、ヨーク４３が回転電機４０の外装を構成するため、図２に示す外装部材５０の部分もヨーク４３で形成される。また、この場合において、ヨーク４３は電磁鋼鈑などの磁性の薄板を積層して構成されている。また、ヨーク４３は、例えば単一鋼塊の磁性材料で形成されてもよい。このようにヨーク４３が外装を構成した場合においても、図２に示す回転電機４０と同様に、コイル装着部材４１で構成された密閉空間が形成され、密閉空間内に円筒型コイル４４が配置されている。
コイル装着部材４１には図示しない孔が設けられていて、孔からコイル装着部材４１と外装部材５０とで囲まれた内部にエポキシ接着剤などの樹脂を充填させることができる。 The exterior member 50 has a cylindrical shape with both ends opened. In addition, coil mounting members 41 are joined to both side ends of the exterior member 50. The exterior member 50 may be formed of a resin (such as PPS). In this case, the exterior member 50 can be formed of a resin having a flexural modulus of 5000 MPa or more. Thereby, a leakage current can be prevented. The exterior member 50 may be made of, for example, a magnetic material or a metal.
The yoke 43 may also serve as the exterior member 50. In this case, since the yoke 43 constitutes the exterior of the rotating electrical machine 40, the portion of the exterior member 50 shown in FIG. In this case, the yoke 43 is configured by laminating magnetic thin plates such as electromagnetic steel plates. Further, the yoke 43 may be formed of, for example, a single steel ingot magnetic material. As described above, even when the yoke 43 forms an exterior, a sealed space constituted by the coil mounting member 41 is formed, and the cylindrical coil 44 is disposed in the sealed space, as in the rotating electrical machine 40 shown in FIG. ing.
The coil mounting member 41 is provided with a hole (not shown), and the inside surrounded by the coil mounting member 41 and the exterior member 50 can be filled with a resin such as an epoxy adhesive.
　ここで、円筒型コイル４４の作成方法について説明する。六角形の巻枠に整列の巻線を巻回した後、巻線は巻枠に巻回した状態で、巻崩れ防止のためにテープで仮固定する。その状態で、巻線をその六角形の巻枠から抜き取った後、巻枠から抜き取った巻線の六角形の一対の対向面を巻枠軸方向に倒して平板状にする。さらに、平板状にした状態の巻線は、円筒胴部４２に巻き付けて、外周をテープで固定される。なお、平板状にした状態の巻線は、円筒胴部４２に巻きつけた後、外周を接着剤で固定してもよい。さらに、円筒胴部４２と円筒型コイル４４の内周面のほぼ全面とが接着剤で固着されてもよい。この場合、振動や衝撃、温度変化があっても円筒型コイル４４が変形することがなく、回転電機の信頼性を高くすることができる。また、円筒型コイル４４の変形がないため、永久磁石４５の外周面と円筒型コイル４４の内周面との隙間、および円筒胴部４２の外周面とヨーク４３との内周面の隙間を小さくできる。したがって、永久磁石４５とヨーク４３との隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。さらに、巻線６２の自己融着樹脂を加熱するアニール作業を省略することができる。 Here, a method of creating the cylindrical coil 44 will be described. After winding the aligned windings on the hexagonal winding frame, the windings are temporarily fixed with tape in order to prevent the winding from being collapsed while being wound around the winding frame. In this state, the winding is extracted from the hexagonal winding frame, and then a pair of hexagonal opposing surfaces of the winding extracted from the winding frame is tilted in the axial direction of the winding frame to form a flat plate. Furthermore, the windings of the state where the flat plate is wound around the cylindrical body portion 42 is fixed to the outer circumference with tape. Incidentally, the winding of conditions in tabular, after wound around the cylindrical body portion 42 may be fixed to the outer periphery with an adhesive. Further, a substantially entire surface of the inner peripheral surface of the cylindrical body portion 42 and the cylindrical coil 44 may be adhesively secured. In this case, the cylindrical coil 44 is not deformed even if vibration, impact, or temperature changes, and the reliability of the rotating electrical machine can be increased. Further, since there is no deformation of the cylindrical coil 44, the clearance between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical coil 44 and the clearance between the outer peripheral surface of the cylindrical body 42 and the inner peripheral surface of the yoke 43 are reduced. Can be small. Therefore, it is possible to reduce the gap between the permanent magnet 45 and the yoke 43, it is possible to increase the energy efficiency of the rotating electric machine. Furthermore, the annealing operation for heating the self-bonding resin of the winding 62 can be omitted.
　このように構成された本実施形態に係る回転電機４０の作用について、以下に説明する。 The operation of the rotating electrical machine 40 according to the present embodiment configured as described above will be described below.
　円筒型コイル４４は、円筒胴部４２の外周面に固定されて、コイル装着部材４１と外装部材５０によって形成された密閉空間に配置されている。
円筒型コイル４４は、空芯コイルに比べて径方向の厚みを小さくできるので、円筒胴部４２の外径とヨーク４３の内径の隙間を小さくできて、かつコイルの密閉空間の体積を小さくできる。そのため、空気の膨張による円筒胴部４２の変形や破損を防止できる。また、円筒胴部４２の変形を防止できるので、円筒胴部４２の厚みを薄くすることができる。したがって、コイルの径方向厚みを薄くでき、かつ円筒胴部４２の厚みを薄くできるため、永久磁石４５とヨーク４３の隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。 The cylindrical coil 44 is fixed to the outer peripheral surface of the cylindrical body 42 and is disposed in a sealed space formed by the coil mounting member 41 and the exterior member 50.
Since the cylindrical coil 44 can be reduced in thickness in the radial direction as compared with the air-core coil, the gap between the outer diameter of the cylindrical body portion 42 and the inner diameter of the yoke 43 can be reduced, and the volume of the sealed space of the coil can be reduced. . Therefore, deformation and breakage of the cylindrical body portion 42 due to air expansion can be prevented. Moreover, since the deformation | transformation of the cylindrical trunk | drum 42 can be prevented, the thickness of the cylindrical trunk | drum 42 can be made thin. Therefore, since the radial thickness of the coil can be reduced and the thickness of the cylindrical body portion 42 can be reduced, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
　また、コイル装着部材４１を曲げ弾性率５０００ＭＰａ以上の樹脂で形成するので、高精度に仕上げることができる。また、円筒胴部４２を薄肉に加工することができる。したがって、永久磁石４５とヨーク４３との隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。 Moreover, since forming the coil mounting member 41 at a bending modulus 5000MPa or more resins can be finished with high accuracy. Further, the cylindrical body portion 42 can be processed into a thin wall. Therefore, it is possible to reduce the gap between the permanent magnet 45 and the yoke 43, it is possible to increase the energy efficiency of the rotating electric machine.
　さらに、円筒型コイル４４を覆う範囲に樹脂が充填された場合、密閉空間の空気を少なくできる。そのため、滅菌処理の高温で空気が膨張しても円筒胴部４２の変形や破損を防止することができる。また、円筒胴部４２の変形を防止できるので、円筒胴部４２の厚みを薄くすることができる。したがって、永久磁石４５とヨーク４３の隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。 Furthermore, when the resin is filled in the area covering the cylindrical coil 44, the air in the sealed space can be reduced. Therefore, it is possible to air at a high temperature of sterilization to prevent deformation or breakage of the cylindrical body portion 42 also expands. Moreover, since the deformation | transformation of the cylindrical trunk | drum 42 can be prevented, the thickness of the cylindrical trunk | drum 42 can be made thin. Therefore, it is possible to reduce the gap between the permanent magnet 45 and the yoke 43, it is possible to increase the energy efficiency of the rotating electric machine.
　また、この場合、円筒型コイル４４はコイルの厚みが薄く一様であるため、充填された樹脂も径方向に薄く一様になる。そのため、密閉空間に隙間が生じて、高温高圧蒸気が円筒型コイル４４を覆う樹脂部に侵入し、樹脂が膨潤しても円筒胴部１３の変形や破損を防止することができる。さらに、円筒胴部４２の厚みを薄くしても変形が抑制されるので、永久磁石４５とヨーク４３の隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。
さらに、コイル装着部材４１は、軸方向端部の径方向の厚さが、円筒胴部４２の径方向の厚さより厚くなっている。また、コイル装着部材４１は、軸方向端部が円筒胴部４２の外径より大径の外径大径部で構成されている。なお、コイル装着部材４１の軸方向端部は外径大径部で構成されているが、コイル装着部材４１の軸方向端部は径方向の厚さが円筒胴部４２の径方向の厚さより厚ければこれに限定されない。例えば、コイル装着部材４１の軸方向端部は、円筒胴部４２の外径より小径の外径小径部、または円筒胴部４２の内径より大径の内径大径部、又は円筒胴部４２の内径より小径の内径小径部で構成されていてもよい。すなわち、コイル装着部材４１の軸方向端部の径方向の厚さが円筒胴部４２の径方向の厚さより厚いため、円筒胴部４２の剛性が高まって、円筒胴部４２の変形がコイル装着部材４１の軸方向端部で抑制されるので、円筒胴部４２を薄肉にすることができる。また、円筒胴部４２の変形が抑制されるため、変形が抑制された分の永久磁石４５の外周面と円筒胴部４２の内周面の隙間、および円筒胴部４２の外周面とヨーク４３の内周面の隙間を小さくできる。したがって、永久磁石４５とヨーク４３との隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。なお、コイル装着部材４１の軸方向の一方の端部が径方向において円筒胴部４２より厚くなっているが、必ずしもこれに限定されない。すなわち、コイル装着部材４１の軸方向の他方の端部の厚さが円筒胴部４２の軸方向の厚さより厚くてもよい。また、コイル装着部材４１の軸方向の両端部の厚さが円筒胴部４２の軸方向の厚さより厚くてもよい。 In this case, since the cylindrical coil 44 is thin and uniform in thickness, the filled resin is also thin and uniform in the radial direction. Therefore, a gap is generated in the sealed space, and high-temperature and high-pressure steam enters the resin portion covering the cylindrical coil 44, so that deformation and breakage of the cylindrical body portion 13 can be prevented even if the resin swells. Furthermore, since deformation is suppressed even if the thickness of the cylindrical body portion 42 is reduced, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
Further, the coil mounting member 41 has a thickness in the radial direction at the end portion in the axial direction larger than a thickness in the radial direction of the cylindrical body portion 42. Further, the coil mounting member 41 is constituted by an outer diameter large diameter portion whose axial end is larger than the outer diameter of the cylindrical body portion 42. In addition, although the axial direction edge part of the coil mounting member 41 is comprised by the outer diameter large diameter part, as for the axial direction edge part of the coil mounting member 41, radial thickness is larger than the radial thickness of the cylindrical trunk | drum 42. If it is thick, it is not limited to this. For example, the axial end of the coil mounting member 41 has an outer diameter smaller diameter portion smaller than the outer diameter of the cylindrical barrel portion 42, an inner diameter larger diameter portion larger than the inner diameter of the cylindrical barrel portion 42, or the cylindrical barrel portion 42. You may be comprised by the internal diameter small diameter part smaller diameter than an internal diameter. That is, since the radial thickness of the axial end of the coil mounting member 41 is thicker than the radial thickness of the cylindrical body 42, the rigidity of the cylindrical body 42 is increased, and deformation of the cylindrical body 42 is caused by the coil mounting. Since it is restrained at the axial end of the member 41, the cylindrical body 42 can be made thin. Further, since the deformation of the cylindrical body 42 is suppressed, the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body 42 and the outer peripheral surface of the cylindrical body 42 and the yoke 43 are reduced. The gap on the inner peripheral surface of the can be reduced. Therefore, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased. In addition, although the one end part of the axial direction of the coil mounting member 41 is thicker than the cylindrical trunk | drum 42 in radial direction, it is not necessarily limited to this. That is, the thickness of the other end of the coil mounting member 41 in the axial direction may be greater than the thickness of the cylindrical body 42 in the axial direction. Further, the thickness of both end portions in the axial direction of the coil mounting member 41 may be greater than the thickness in the axial direction of the cylindrical body portion 42.
　また、円筒型コイル４４は、内周側に円筒胴部４２を配置し、外周側にヨーク４３を配置することができる。この場合、ヨーク４３の半径方向の長さは、円筒胴部４２の半径方向の長さより長く設定される。また、半径方向長さが円筒胴部４２より長いヨーク４３は、円筒胴部４２を変形させる例えば曲げ応力に対して変形量を小さくできる。そのため、円筒胴部４２が薄肉であっても変形を抑制することができる。また、円筒胴部４２の変形が抑制されるため、変形が抑制された分の永久磁石４５の外周面と円筒胴部４２の内周面との隙間、および円筒胴部４２の外周面とヨーク４３の内周面との隙間を小さくできる。したがって、永久磁石４５とヨーク４３との隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。 Further, the cylindrical coil 44, a cylindrical body portion 42 on the inner peripheral side is disposed, it is possible to arrange the yoke 43 on the outer peripheral side. In this case, the radial length of the yoke 43 is set longer than the radial length of the cylindrical body portion 42. Further, the yoke 43 having a longer length in the radial direction than the cylindrical body 42 can reduce the deformation amount with respect to, for example, bending stress that deforms the cylindrical body 42. Therefore, even if the cylindrical body 42 is thin, deformation can be suppressed. Further, since the deformation of the cylindrical body portion 42 is suppressed, the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body portion 42 and the outer peripheral surface of the cylindrical body portion 42 and the yoke are reduced. The clearance with the inner peripheral surface of 43 can be reduced. Therefore, it is possible to reduce the gap between the permanent magnet 45 and the yoke 43, it is possible to increase the energy efficiency of the rotating electric machine.
　円筒型コイル４４の作成において、平板状の巻線６２が円筒胴部４２に巻き付けられテープで固定される。そのため、あらかじめ円筒型に形成した円筒コイルを挿入するよりも、挿入する隙間の分、円筒胴部４２と円筒型コイル４４の隙間を小さくできる。
さらに、円筒胴部４２の円筒形状に円筒型コイル４４を成形するため、円筒型コイル４４の円筒形状を高精度に形成することができ、円筒胴部４２の外周面とヨーク４３の内周面との隙間を小さくできる。したがって、あらかじめ円筒型に形成して円筒型コイルを円筒胴部に挿入するよりも、永久磁石４５とヨーク４３との隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。また、手間が掛かって作業性が悪かった円筒コイルのアニール作業を省略することができる。 In the production of the cylindrical coil 44, a flat coil 62 is wound around the cylindrical body 42 and fixed with tape. Therefore, the gap between the cylindrical body portion 42 and the cylindrical coil 44 can be reduced by the amount of the gap to be inserted, rather than inserting a cylindrical coil formed in a cylindrical shape in advance.
Furthermore, since the cylindrical coil 44 is formed into the cylindrical shape of the cylindrical body portion 42, the cylindrical shape of the cylindrical coil 44 can be formed with high accuracy, and the outer peripheral surface of the cylindrical body portion 42 and the inner peripheral surface of the yoke 43 can be formed. Can be made smaller. Therefore, the gap between the permanent magnet 45 and the yoke 43 can be reduced, and the energy efficiency of the rotating electrical machine can be increased, rather than forming a cylindrical shape in advance and inserting the cylindrical coil into the cylindrical body. Further, the annealing operation of the cylindrical coil, which is troublesome and has poor workability, can be omitted.
　さらに、円筒型コイル４４は、永久磁石の長手方向に沿う直線導体部を備えている。例えば、円筒型コイル４４が亀甲巻に形成された場合には、亀甲巻の直線導体部は円筒軸上に巻線の一部が揃う。これにより、磁束に鎖交する円筒軸方向の直線導体部が円筒の巻線の中央部に存在し、誘導起電力を有効に発生できるため、全体の小型化を図りつつ、効率的に発電することができる。
また、本発明の別の実施形態を図８を参照して説明する。
図８は回転電機の他の実施形態を示めす図であり、当該回転電機４０は、外部と端子４９を通じて電気的に接続されて、誘導起電力を発生させる円筒コイル４４と、回転して誘導起電力を発生させるロータ２０と、これらの各部材が収められるヨーク７３などとから構成される。本実施形態は、ヨークが外装部材を兼ねている構成となっている。なお、本実施形態においても、図２に示すヨークと外装部材とを備える構成となっていてもよい。
ロータ２０は、円筒型の永久磁石４５と回転軸４６とからなり、軸受保持部材７７、７８の中心位置に配置した軸受４７、４８により二点間で回転自在に支持されている。また、永久磁石４５の中央には、長手方向に沿って軸４６が貫通固定されている。 Further, the cylindrical coil 44 includes a linear conductor portion along the longitudinal direction of the permanent magnet. For example, when the cylindrical coil 44 is formed in a turtle shell winding, the linear conductor portion of the turtle shell winding has a part of the winding on the cylindrical shaft. Thereby, the linear conductor portion in the cylindrical axis direction interlinking with the magnetic flux exists in the central portion of the cylindrical winding, and the induced electromotive force can be effectively generated. Therefore, the power generation is efficiently performed while reducing the overall size. be able to.
Another embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a diagram showing another embodiment of the rotating electrical machine. The rotating electrical machine 40 is electrically connected to the outside through a terminal 49, and is rotated to induce a cylindrical coil 44 that generates an induced electromotive force. The rotor 20 generates an electromotive force, and a yoke 73 and the like in which each of these members is housed. In the present embodiment, the yoke also serves as an exterior member. In this embodiment, the yoke and the exterior member shown in FIG. 2 may be provided.
The rotor 20 includes a cylindrical permanent magnet 45 and a rotating shaft 46, and is rotatably supported between two points by bearings 47 and 48 disposed at the center positions of the bearing holding members 77 and 78. A shaft 46 is fixed through the center of the permanent magnet 45 along the longitudinal direction.
　ヨーク７３は、両端が開口した円筒形状を有しており、永久磁石の磁極同士を磁気的に接続するもので、電磁鋼鈑などの磁性の薄板を積層して構成されている。なお、ヨーク７３は、例えば単一鋼塊の磁性材料で形成されてもよい。これにより、ヨーク７３は外装部材を兼ねることができる。
また、ヨーク７３の一端側には、コイル装着部材４１が接合されている。また、コイル装着部材４１は、永久磁石４５と対向する円筒胴部４２を有している。また、円筒胴部４２の外周面に円筒型コイル４４が固定されている。コイル装着部材４１は、樹脂（ＰＰＳ（ｐｏｌｙｐｈｅｎｙｌｅｎｅ　ｓｕｌｆｉｄｅ）など）で構成される。またコイル装着部材４１は、曲げ弾性率が５０００ＭＰａ以上の樹脂を用いるとよい。コイル装着部材４１を樹脂で形成した場合、渦電流が発生せず損失を低減させる効果が得られる。なお、コイル装着部材は、アルミや真鍮などの非磁性金属で構成されていてもよい。
ヨーク７３の他端側と、コイル装着部材４１の端部は、円環状開口を有し、円環状開口を塞ぐように、端子ピン４９が取り付いた蓋７１が嵌め込まれている。蓋７１には図示しない孔が設けられていて、孔からコイル装着部材４１とヨーク７３と蓋７１とで囲まれた内部にエポキシ接着剤を充填している。なお、蓋７１は、コイル装着部材４１と一体に形成されていてもよい。その場合、コイル装着部材４１には図示しない孔が設けられていて、孔からコイル装着部材４１とヨーク７３とで囲まれた内部にエポキシ接着剤を充填することができる。
また、コイル装着部材４１は、軸方向端部の径方向の厚さが、円筒胴部４２の径方向の厚さより厚くなっている。また、コイル装着部材４１は、軸方向の両端部がそれぞれ円筒胴部４２の外径より大径の外径大径部、円筒胴部４２の外径より小径の外径小径部で構成されている。なお、コイル装着部材４１の軸方向端部は外径大径部、外径小径部で構成されているが、コイル装着部材４１の軸方向端部は径方向の厚さが円筒胴部４２の径方向の厚さより厚ければこれに限定されない。例えば、コイル装着部材４１の軸方向端部は円筒胴部４２の内径より大径の内径大径部、又は円筒胴部４２の内径より小径の内径小径部で構成されていてもよい。すなわち、コイル装着部材４１の軸方向端部の径方向の厚さが円筒胴部４２の径方向の厚さより厚いため、円筒胴部４２の剛性が高まって、円筒胴部４２の変形がコイル装着部材４１の軸方向端部で抑制されるので、円筒胴部４２を薄肉にすることができる。また、円筒胴部４２の変形が抑制されるため、変形が抑制された分の永久磁石４５の外周面と円筒胴部４２の内周面の隙間、および円筒胴部４２の外周面とヨーク７３の内周面の隙間を小さくできる。したがって、永久磁石４５とヨーク７３との隙間を小さくでき、回転電機のエネルギー効率を高くすることができる。 The yoke 73 has a cylindrical shape with both ends opened, and magnetically connects the magnetic poles of permanent magnets, and is configured by laminating magnetic thin plates such as electromagnetic steel plates. The yoke 73 may be formed of, for example, a single steel ingot magnetic material. As a result, the yoke 73 can also serve as an exterior member.
A coil mounting member 41 is joined to one end side of the yoke 73. The coil mounting member 41 has a cylindrical body portion 42 that faces the permanent magnet 45. A cylindrical coil 44 is fixed to the outer peripheral surface of the cylindrical body portion 42. The coil mounting member 41 is made of a resin (PPS (polyphenylene sulfide) or the like). The coil mounting member 41 may be made of a resin having a flexural modulus of 5000 MPa or more. When the coil mounting member 41 is made of resin, an eddy current is not generated and an effect of reducing loss can be obtained. The coil mounting member may be made of a nonmagnetic metal such as aluminum or brass.
The other end side of the yoke 73 and the end of the coil mounting member 41 have an annular opening, and a lid 71 to which a terminal pin 49 is attached is fitted so as to close the annular opening. The lid 71 is provided with a hole (not shown), and an epoxy adhesive is filled into the inside surrounded by the coil mounting member 41, the yoke 73 and the lid 71 through the hole. The lid 71 may be formed integrally with the coil mounting member 41. In that case, the coil mounting member 41 is provided with a hole (not shown), and the inside surrounded by the coil mounting member 41 and the yoke 73 can be filled with the epoxy adhesive from the hole.
Further, the coil mounting member 41 has a thickness in the radial direction at the end portion in the axial direction that is greater than a thickness in the radial direction of the cylindrical body portion 42. Further, the coil mounting member 41 is configured by an outer diameter large diameter portion whose both ends in the axial direction are larger than the outer diameter of the cylindrical body portion 42 and an outer diameter small diameter portion whose diameter is smaller than the outer diameter of the cylindrical body portion 42. Yes. In addition, although the axial direction edge part of the coil mounting member 41 is comprised by the outer diameter large diameter part and the outer diameter small diameter part, the axial direction edge part of the coil mounting member 41 has radial thickness of the cylindrical trunk | drum 42. If it is thicker than the thickness of radial direction, it will not be limited to this. For example, the end portion in the axial direction of the coil mounting member 41 may be constituted by an inner diameter large diameter portion larger than the inner diameter of the cylindrical body portion 42 or an inner diameter small diameter portion smaller than the inner diameter of the cylindrical body portion 42. That is, since the radial thickness of the axial end of the coil mounting member 41 is thicker than the radial thickness of the cylindrical body 42, the rigidity of the cylindrical body 42 is increased, and deformation of the cylindrical body 42 is caused by the coil mounting. Since it is restrained at the axial end of the member 41, the cylindrical body 42 can be made thin. Further, since the deformation of the cylindrical body 42 is suppressed, the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body 42 and the outer peripheral surface of the cylindrical body 42 and the yoke 73 are reduced. The gap on the inner peripheral surface of the can be reduced. Therefore, the gap between the permanent magnet 45 and the yoke 73 can be reduced, and the energy efficiency of the rotating electrical machine can be increased.
　コイル装着部材４１の内周面の一端側には、軸受保持部材７８が接合され、コイル装着部材４１の内周面の他端側には、軸受保持部材７７が接合されて、軸受４７および４８に連結されている。 A bearing holding member 78 is joined to one end side of the inner peripheral surface of the coil mounting member 41, and a bearing holding member 77 is joined to the other end side of the inner peripheral surface of the coil mounting member 41. It is connected to.
　このような構成にすることで、永久磁石４５とコイル装着部材４１を精度良く同軸に配置することができ、永久磁石４５の外周面と円筒胴部４２の内周面との隙間を小さくできる。したがって、永久磁石４５とヨーク７３との隙間を小さくできるため、回転電機のエネルギー効率を高くすることができる。なお、軸受４７，４８の配置は上記に限定される必要はない。すなわち、軸受４７，４８は図２に示す実施形態と同様の位置にしてもよい。
本発明は上述した実施の形態に限定されず、その要旨を逸脱しない範囲で種々変形可能である。 With such a configuration, the permanent magnet 45 and the coil mounting member 41 can be arranged coaxially with high accuracy, and the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical body 42 can be reduced. Therefore, since the gap between the permanent magnet 45 and the yoke 73 can be reduced, the energy efficiency of the rotating electrical machine can be increased. The arrangement of the bearings 47 and 48 need not be limited to the above. That is, the bearings 47 and 48 may be in the same positions as in the embodiment shown in FIG.
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
　また、本実施形態では巻枠は、六角形に限定されるものではなく、多角形であれば良いのは勿論のことである。
また、本実施形態では、回転電機のうち発電機について説明したが、例えば３相のコイルに交番電流を順次切り替えるように供給して、永久磁石を回転させるモータとして利用することも可能である。 Further, in the present embodiment, the winding frame is not limited to a hexagon, and needless to say, it may be a polygon.
Further, in the present embodiment, the generator of the rotating electrical machine has been described. However, for example, it is also possible to use a motor that rotates a permanent magnet by supplying alternating current to three-phase coils so as to sequentially switch.
　１　　歯科治療用ハンドピース
　２　　ヘッド部
　３　　把持部
　２０　ロータ
２１　工具用タービン
　２２　治療用工具
　３１　ＬＥＤ
　３２　電線
　３３　エアー通路
　３７　タービン羽根
　３８　後段ハウジング
　３９　前段ハウジング
　４０　回転電機
　４１　コイル装着部材
４２　円筒胴部
４３、７３　ヨーク　
　４４　円筒型コイル
　４５　永久磁石
　４６　軸
　４７、４８　軸受
５０　外装部材
５１　給気管
　５２　給水管
　５３、５４　軸受保持部材
　５６　給気管
　５７　給水管
６１　巻枠
　６２　巻線
　６３　テープ
　６４　カーリング棒
　６５　カーリングした円筒型コイル
　６６　円筒成形治具
　７１　蓋
　７７、７８　軸受保持部材
１０１　空芯コイル
１０２　コイル部
１０３　空芯部 DESCRIPTION OF SYMBOLS 1 Handpiece for dental treatment 2 Head part 3 Grasping part 20 Rotor 21 Tool turbine 22 Treatment tool 31 LED
32 Electric wire 33 Air passage 37 Turbine blade 38 Rear housing 39 Front housing 40 Rotating electrical machine 41 Coil mounting member 42 Cylindrical body 43, 73 Yoke
44 Cylindrical coil 45 Permanent magnet 46 Shaft 47, 48 Bearing 50 Exterior member 51 Air supply pipe 52 Water supply pipe 53, 54 Bearing holding member 56 Air supply pipe 57 Water supply pipe 61 Winding frame 62 Winding 63 Tape 64 Curling rod 65 Curled cylindrical type Coil 66 Cylindrical forming jig 71 Lid 77, 78 Bearing holding member 101 Air core coil 102 Coil portion 103 Air core portion

Claims (17)

  1. 　外周に複数の磁極を周方向に配列してなる永久磁石と、
    　前記永久磁石とエアーギャップを介して対向した位置に円筒胴部を有するコイル装着部材と、
    　所定方向に巻回されたコイルを前記所定方向に倒した平板状コイルであり、前記平板状コイルが円環状となるように前記円筒胴部の外周部に固定された円筒型コイルと、
    　前記円筒型コイルの外周部と対向した位置に備えられた磁性材料からなるヨークと、
    を備え、
    前記円筒型コイルは、前記コイル装着部材で構成された密閉空間に配置されていることを特徴とする回転電機。     A permanent magnet having a plurality of magnetic poles arranged in the circumferential direction on the outer periphery;
    A coil mounting member having a cylindrical body at a position facing the permanent magnet via an air gap;
    A cylindrical coil which is a flat coil in which a coil wound in a predetermined direction is tilted in the predetermined direction, and is fixed to an outer peripheral portion of the cylindrical body so that the flat coil is annular,
    A yoke made of a magnetic material provided at a position facing the outer periphery of the cylindrical coil;
    With
    The rotating electrical machine according to claim 1, wherein the cylindrical coil is disposed in a sealed space constituted by the coil mounting member.
  2. 　前記ヨークの外周側に備えられた外装部材を備え、
    前記密閉空間が前記コイル装着部材と前記外装部材とで構成されることを特徴とする請求項１に記載の回転電機。     An exterior member provided on the outer peripheral side of the yoke;
    The rotating electrical machine according to claim 1, wherein the sealed space includes the coil mounting member and the exterior member.
  3. 　前記密閉空間は、少なくとも前記円筒型コイルを覆う範囲に樹脂が充填されていることを特徴とする請求項１に記載の回転電機。 The rotating electrical machine according to claim 1, wherein the sealed space is filled with a resin in a range covering at least the cylindrical coil.
  4. 　前記円筒型コイルは、多角形状の巻枠に巻回した巻線を巻枠の巻方向に倒して平板状にした後、前記コイル装着部材の前記円筒胴部の外周部に巻き付けて円筒型に成形されたものであり、かつ永久磁石の長手方向に沿う直線導体部を備えることを特徴とする請求項１に記載の回転電機。 The cylindrical coil is formed into a cylindrical shape by winding a winding wound around a polygonal winding frame in the winding direction of the winding frame into a flat plate shape, and then winding it around the outer periphery of the cylindrical body of the coil mounting member. The rotating electrical machine according to claim 1, further comprising a linear conductor portion that is formed and extends along a longitudinal direction of the permanent magnet.
  5. 　前記コイル装着部材は、円筒軸上の端部の径方向の厚さが、前記円筒胴部の径方向の厚さより厚いことを特徴とする請求項１に記載の回転電機。 2. The rotating electrical machine according to claim 1, wherein the coil mounting member has a thickness in a radial direction of an end portion on a cylindrical shaft larger than a thickness in a radial direction of the cylindrical body.
  6. 　前記コイル装着部材は、前記円筒胴部の円筒軸上の端部に前記円筒胴部の外径よりも大径の外径大径部を備えていることを特徴とする請求項５に記載の回転電機。 The said coil mounting member is provided with the outer diameter large diameter part larger diameter than the outer diameter of the said cylindrical trunk | drum in the edge part on the cylindrical axis | shaft of the said cylindrical trunk | drum. Rotating electric machine.
  7. 　前記ヨークは、前記ヨークの半径方向長さが前記円筒胴部の半径方向長さよりも長く設定されていることを特徴とする請求項１に記載の回転電機。 The rotating electric machine according to claim 1, wherein the yoke is set such that a radial length of the yoke is longer than a radial length of the cylindrical body.
  8. 前記円筒型コイルの内周側に前記円筒胴部が配置されるとともに、前記円筒型コイルの外周側に前記ヨークが配置され、前記円筒型コイルが前記円筒胴部及び前記ヨークにより挟持されていることを特徴とする請求項７に記載の回転電機。 The cylindrical body is disposed on the inner peripheral side of the cylindrical coil, the yoke is disposed on the outer peripheral side of the cylindrical coil, and the cylindrical coil is sandwiched between the cylindrical body and the yoke. The rotating electrical machine according to claim 7.
  9. 　前記コイル装着部材は、樹脂で形成されていることを特徴とする請求項１に記載の回転電機。 The rotating electrical machine according to claim 1, wherein the coil mounting member is made of resin.
  10. 前記コイル装着部材は、曲げ弾性率が５０００ＭＰａ以上の樹脂で形成されていることを特徴とする請求項９に記載の回転電機。 The rotating electrical machine according to claim 9, wherein the coil mounting member is made of a resin having a flexural modulus of 5000 MPa or more.
  11. 　前記外装部材は、樹脂で形成されていることを特徴とする請求項２に記載の回転電機。 The rotating electrical machine according to claim 2, wherein the exterior member is made of resin.
  12. 　前記外装部材は、曲げ弾性率が５０００ＭＰａ以上の樹脂で形成されていることを特徴とする請求項１１に記載の回転電機。 The rotating electrical machine according to claim 11, wherein the exterior member is made of a resin having a flexural modulus of 5000 MPa or more.
  13. 　前記永久磁石は、回転可能な軸に取り付けられており、
    　前記軸の前記永久磁石と異なる位置に配置された軸受を備え、
    　前記軸受の外周面は、前記コイル装着部材から離間して配置された軸受保持部材の内周面に当接していることを特徴とする請求項１に記載の回転電機。     The permanent magnet is attached to a rotatable shaft;
    A bearing disposed at a position different from the permanent magnet of the shaft;
    2. The rotating electrical machine according to claim 1, wherein an outer peripheral surface of the bearing is in contact with an inner peripheral surface of a bearing holding member that is spaced apart from the coil mounting member.
  14. 　前記永久磁石は、回転可能な軸に取り付けられており、
    　前記軸の前記永久磁石と異なる位置に配置された軸受を備え、
    　前記軸受の外周面は、前記コイル装着部材の内周面、または前記コイル装着部材の内周側に配置された軸受保持部材の内周面に当接していることを特徴とする請求項１に記載の回転電機。     The permanent magnet is attached to a rotatable shaft;
    A bearing disposed at a position different from the permanent magnet of the shaft;
    The outer peripheral surface of the bearing is in contact with an inner peripheral surface of the coil mounting member or an inner peripheral surface of a bearing holding member arranged on the inner peripheral side of the coil mounting member. The rotating electrical machine described.
  15. 　前記永久磁石は、回転可能な軸に取り付けられており、
    　前記軸の前記永久磁石と異なる位置に配置された２つの軸受を備え、
    一方の前記軸受の外周面は、前記コイル装着部材の内周面、またはコイル装着部材の内周側に配置された軸受保持部材の内周面に当接しているとともに、他方の前記軸受の外周面は、前記コイル装着部材から離間して配置されている軸受保持部材の内周面に当接していることを特徴とする請求項１に記載の回転電機。     The permanent magnet is attached to a rotatable shaft;
    Two bearings arranged at different positions from the permanent magnet of the shaft,
    The outer peripheral surface of one of the bearings is in contact with the inner peripheral surface of the coil mounting member or the inner peripheral surface of a bearing holding member disposed on the inner peripheral side of the coil mounting member, and the outer periphery of the other bearing 2. The rotating electrical machine according to claim 1, wherein the surface is in contact with an inner peripheral surface of a bearing holding member disposed apart from the coil mounting member.
  16. 　前記軸受は、前記軸の端部に配置されていることを特徴とする請求項１３に記載の回転電機。 The rotating electrical machine according to claim 13, wherein the bearing is disposed at an end of the shaft.
  17. 　請求項１３乃至請求項１６の何れか一項に記載の回転電機と、
    　前記軸の前記永久磁石及び前記軸受と異なる位置に配置されたタービン羽根と、
    　前記円筒型コイルと電気的に接続された発光部品と、
    　前記タービン羽根を回転させる流体を供給する給気管と、
    を備えることを特徴とする歯科用又は医療用のハンドピース。     A rotating electrical machine according to any one of claims 13 to 16,
    A turbine blade disposed at a position different from the permanent magnet and the bearing of the shaft;
    A light-emitting component electrically connected to the cylindrical coil;
    An air supply pipe for supplying a fluid for rotating the turbine blade;
    A dental or medical handpiece comprising:
PCT/JP2010/064929 2009-10-06 2010-09-01 Rotating electric machine, and dental or medical handpiece WO2011043143A1 (en)

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JP2010165929A JP5615613B2 (en) 2009-10-06 2010-07-23 Rotating electric machine and dental or medical handpiece
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CN104027175A (en) * 2013-03-07 2014-09-10 W和H牙科产品比莫斯有限公司 Dynamoelectric converter and medical or dental device having a dynamoelectric converter

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JP2002291187A (en) * 2001-03-26 2002-10-04 Matsushita Electric Ind Co Ltd Wire winding method for motor and motor using the winding
JP2004180457A (en) * 2002-11-28 2004-06-24 Toshiba Corp Driving servomotor for medical equipment and servomotor
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JP2013085750A (en) * 2011-10-19 2013-05-13 Seiko Instruments Inc Generator for dental handpiece
AT512093A3 (en) * 2011-10-19 2013-06-15 Seiko Instr Inc Power generator for dental handpiece
AT512093B1 (en) * 2011-10-19 2014-10-15 Seiko Instr Inc Power generator for dental handpiece
CN104027175A (en) * 2013-03-07 2014-09-10 W和H牙科产品比莫斯有限公司 Dynamoelectric converter and medical or dental device having a dynamoelectric converter
EP2774571A1 (en) * 2013-03-07 2014-09-10 W & H Dentalwerk Bürmoos GmbH Dynamoelectric converter and medical, in particular dental device with a dynamoelectric converter
US9670896B2 (en) 2013-03-07 2017-06-06 W&H Dentalwerk Bürmoos GmbH Dynamoelectric converter and medical or dental device having a dynamoelectric converter

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