JP5623170B2 - Rotating electric machine and dental or medical handpiece - Google Patents

Description

  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.

  Conventionally, in a coreless type rotating electrical machine using a cylindrical coil, a cylindrical coil is arranged on the inner peripheral side of a case made of a magnetic material, and a permanent magnet arranged opposite to the cylindrical coil via a gap is arranged. A motor including a rotor is known (Patent Document 1).

  Such a motor is incorporated in a case after a cylindrical coil is previously formed into a cylindrical shape.

The cylindrical coil used for the coreless type rotating electrical machine is roughly divided 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.

  In general, in a motor, it is necessary to set a small gap between the permanent magnet and the case in order to increase the magnetic flux linked to the cylindrical coil for the purpose of generating high torque. That is, the gap between the permanent magnet and the case 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. On the contrary, if the gap is large, the magnetic flux of the permanent magnet linked to the coil is reduced, and the generated torque of the motor is reduced.

JP-A-6-62555

  The above-described motor is arranged so that the inner peripheral surface of the cylindrical coil faces the permanent magnet through a gap. Therefore, when the cylindrical coil is deformed by being left in a high temperature atmosphere, there is a problem that the coil and the permanent magnet come into contact with each other.

  In particular, medical devices used in the field of surgery, dentistry, and the like are sterilized with, for example, high-temperature and pressurized steam before and after use in order to prevent bacteria, viruses, etc. from infecting patients through the device. Applied. Therefore, the motor incorporated in the medical device needs to be configured to withstand high-temperature and pressurized steam.

  Also, if the gap is widened so that it does not come into contact with the permanent magnet even if the cylindrical coil is deformed, the gap between the permanent magnet and the case is increased, the magnetic flux in the magnetic field of the magnet is reduced, and the torque generated by the motor is reduced. There is a problem that it ends up.

  The cylindrical coil is formed in a cylindrical shape in the state of a single coil, and this coil is disposed inside the case. Forming a cylindrical coil into a cylindrical shape has a problem in that it takes a lot of work and the workability is poor.

  Hereinafter, a conventional method for producing a cylindrical coil of turtle shell winding will be described with reference to FIGS.

  FIG. 4 is a diagram for explaining the winding work. The aligned windings 62 are wound around the hexagonal winding frame 61, and are temporarily fixed with the tape 63 in order to prevent the winding from collapsing 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 a plate-like 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. 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 66 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 present invention has been made in view of the above-described circumstances, and it is possible to increase energy efficiency by preventing the deformation of the cylindrical coil and reducing the gap between the permanent magnet and the case. An object of the present invention is to provide a rotating electrical machine that can be manufactured by a simple method.

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, a cylindrical coil whose entire surface is fixed to the outer periphery of the cylindrical body of the coil mounting member, a yoke made of a magnetic material provided at a position facing the outer periphery of the cylindrical coil, An outer member provided with a yoke on the inner peripheral side, and the coil mounting member has a radial thickness at an end on a cylindrical shaft larger than a radial thickness of the cylindrical body, and the cylinder than the outer diameter of the cylindrical body portion to the end portion of the cylindrical axis of the barrel, it characterized that you have an outer large diameter diameter of large diameter.

In the structure of this invention, since the whole surface of a cylindrical coil is being fixed to the cylindrical trunk | drum outer peripheral surface of a coil mounting member, while preventing a coil and a permanent magnet from contacting, a deformation | transformation of a coil can be prevented. Therefore, it is not necessary to set a gap in anticipation of the deformation of the coil, so that the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the cylindrical coil and the gap between the outer peripheral surface of the cylindrical coil 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.
Further, 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.

  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 wound around an outer peripheral portion and formed into a cylindrical shape, and the cylindrical coil includes a linear conductor portion along the longitudinal direction of the permanent magnet.

  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 by inserting the gap between the cylindrical body and the cylindrical coil than when the cylindrical coil formed in advance in the cylindrical shape is inserted 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. Further, it is possible to omit part of the process of processing the cylindrical coil, which takes a lot of time and has poor workability.

  The rotating electrical machine according to the present invention is characterized in that the cylindrical body portion of the coil mounting member and the substantially entire inner peripheral surface of the cylindrical coil are fixed with an adhesive.

  With the configuration of the present invention, the cylindrical coil is not deformed even when there is vibration, impact, or temperature change, and the reliability of the rotating electrical machine can be increased. Further, since there is no deformation of the cylindrical coil, there is no need to set a gap that allows for the deformation of the coil. Therefore, the clearance between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the cylindrical coil and the clearance between the outer peripheral surface of the cylindrical coil 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. Furthermore, the conventional annealing operation for heating the self-fusing resin of the winding can be omitted.

  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. Moreover, it can be processed into a thin wall. Therefore, the rotating electrical machine can be made small and light.

  The rotating electrical machine according to the present invention is characterized in that the cylindrical body portion of the coil mounting member includes a hole.

  With the configuration of the present invention, the rotating electrical machine can be reduced in weight. Moreover, since the flow of the eddy current generated when the coil mounting member is formed of a conductive material is blocked by the air holes, the loss due to the eddy current can be reduced. Therefore, 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.

  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.

  With the configuration of the present invention, the permanent magnet and the coil mounting member can be arranged coaxially with high accuracy. 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, since the gap between the permanent magnet and the yoke can be reduced, the energy efficiency of the rotating electrical machine can be increased.

  Moreover, 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.

  According to the configuration of the present invention, the coaxial between the permanent magnet and the coil mounting member can be arranged with high accuracy 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.

  The rotating electrical machine according to the present invention is characterized in that the bearing is disposed at an end of the shaft.

  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.

  According to the rotating electrical machine of the present invention, since the entire surface of the cylindrical coil is fixed to the outer peripheral surface of the cylindrical body portion of the coil mounting member, it is possible to prevent contact between the coil and the permanent magnet and deformation of the coil. Therefore, there is no need to set a gap in anticipation of the deformation of the coil, so that the gap between the outer peripheral surface of the permanent magnet and the inner peripheral surface of the cylindrical coil and the gap between the outer peripheral surface of the cylindrical coil 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.

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 | winding wound around the winding frame of the turtle shell winding coil. It is the figure of the flat forming coil which carried out the flat press of the turtle shell winding coil. 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. 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. It is sectional drawing of the rotary electric machine of this invention. It is a perspective view of the coil mounting member figure of the rotary electric machine concerning other embodiment, and is a coil mounting member which provided the hole in the cylindrical trunk | drum.

  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 56 and a water supply pipe 57 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 56 is squeezed 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, since the magnetic flux interlinking with the cylindrical coil 44 does not decrease, 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. 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 gap between the outer circumferential surface of the permanent magnet 45 and the inner circumferential surface of the cylindrical coil 44 and the gap between the outer circumferential surface of the cylindrical coil 44 and the inner circumferential surface of the yoke 43 can be reduced. Therefore, even 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 magnetized in 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 (such as PPS (polyphenylene sulfide)). 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 cylindrical coil 44 is attached to one end 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 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.

  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. Further, the winding in the form of a flat plate is created by winding around the cylindrical body portion 42 and fixing with an adhesive.

  The operation of the rotating electrical machine 40 according to this embodiment configured as described above will be described below.

  Since the entire surface of the cylindrical coil 44 is fixed to the cylindrical body portion 42, contact between the cylindrical coil 44 and the permanent magnet 45 can be prevented, and deformation of the cylindrical coil 44 can be prevented. A gap between the inner peripheral surface of the mold coil 44 and a gap between the outer peripheral surface of the cylindrical coil 44 and the inner peripheral surface of the yoke 43 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.

  Further, since the coil mounting member 41 is formed of a resin having a flexural modulus of 5000 MPa or more, it can be finished with high accuracy. Further, the cylindrical body portion 42 can be processed into a thin wall. 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.

  Further, when the resin is filled in a range covering the cylindrical coil 44, the air in the space surrounded by the coil mounting member 41 and the exterior member 50 can be reduced. Therefore, even if the air expands due to the high temperature of the sterilization treatment, the cylindrical body portion 42 can be prevented from being deformed or damaged. 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, 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 this case, since the thickness of the cylindrical coil 44 is thin and uniform, the resin is also thin and uniform in the radial direction. Therefore, even if a gap is generated in the space surrounded by the coil mounting member 41 and the exterior member 50 and high-temperature high-pressure steam enters the resin part covering the cylindrical coil 44 and the resin swells, the cylindrical body part 13 is deformed. And damage can be prevented. 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, in the coil mounting member 41, since the radial thickness of the axial end is thicker than the radial thickness of the cylindrical body 42, the rigidity of the cylindrical body 42 is increased, and the deformation of the cylindrical body 42 is caused by the coil. Since it is restrained at the end in the axial direction of the mounting 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.

  Further, when the cylindrical body 42 and almost the entire inner peripheral surface of the cylindrical coil 44 are fixed with an adhesive, the cylindrical coil 44 is not deformed even if there is vibration, impact, or temperature change. The reliability of the electric machine can be increased. Further, since the cylindrical coil 44 is not deformed, the gap between the outer peripheral surface of the permanent magnet 45 and the inner peripheral surface of the cylindrical coil 44 and the gap between the outer peripheral surface of the cylindrical coil 44 and the inner peripheral surface of the yoke 43 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. Furthermore, the annealing operation for heating the self-fusing resin of the winding can be omitted.

In the production of the cylindrical coil 44, the winding in the form of a flat plate is wound around the cylindrical body 42 and fixed with an adhesive. Therefore, it is possible to reduce the gap between the cylindrical body portion 42 and the cylindrical coil 44 by the amount of the gap to be inserted, rather than inserting a cylindrical coil formed in advance in a cylindrical shape. The cylindrical coil 44 is cylindrical on the inner peripheral side. The trunk | drum 42 can be arrange | positioned and the yoke 43 can be arrange | positioned on the outer peripheral side. In this case, the length of the yoke 43 in the radial direction is set longer than the length of the cylindrical body 42 in the radial direction. 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, 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, since the cylindrical coil 44 is formed following the cylindrical shape of the cylindrical body portion 42, the cylindrical shape of the cylindrical coil 44 can be formed with high accuracy. The gap with the peripheral surface 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, rather than forming a cylindrical shape in advance and inserting the cylindrical coil into the cylindrical body. Moreover, the annealing operation of the cylindrical coil, which is troublesome and has poor workability, can be omitted.

  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 rotated with a cylindrical coil 44 that generates an induced electromotive force. The rotor 20 is configured to generate an induced electromotive force, and an exterior member 51 in which these members are housed. In the present embodiment, the exterior member serves as the yoke.

  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 exterior member 51 has a cylindrical shape with both ends opened, and magnetically connects the magnetic poles of the permanent magnet, and is made of a magnetic material such as ferrite stainless steel. The exterior member 51 may be configured by laminating magnetic thin plates such as electromagnetic steel plates. Thereby, the exterior member 51 can also serve as a yoke.

  A coil mounting member 41 is joined to one end side of the exterior member 51. 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 resin (such as PPS). 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 exterior member 51 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 exterior member 51, 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 exterior member 51 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 portion 42 is suppressed, the clearance 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 exterior member are reduced. The gap between the inner peripheral surfaces of 51 can be reduced. Therefore, the gap between the permanent magnet 45 and the exterior member 51 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.

  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 exterior member 51 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. For example, as shown in FIG. 9, holes may be provided in the cylindrical body portion 42 of the coil mounting member 41. Since there is a hole, the rotating electrical machine can be reduced in weight. Further, since the flow of eddy current generated when the coil mounting member 41 is formed of a conductive material is blocked by the air holes, loss due to the eddy current can be reduced. Therefore, the energy efficiency of the rotating electrical machine can be increased.

  Further, the reel of the present invention is not limited to a hexagon, and it is needless to say that 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.

DESCRIPTION OF SYMBOLS 1 Handpiece for dental treatment 2 Head part 3 Grasping part 20 Rotor 21 Turbine for tool 22 Treatment tool 31 LED
32 Electric wire 33 Air passage 37 Turbine blade 38 Rear housing 39 Front housing 40 Rotating electric machine 41 Coil mounting member 42 Cylindrical body 43 Yoke 44 Cylindrical coil 45 Permanent magnet 46 Shaft 47, 48 Bearing 50, 51 Exterior member 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 coil 66 Cylindrical forming jig 71 Cover 77, 78 Bearing holding member

Claims (15)

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 whose entire surface is fixed to the outer periphery of the cylindrical body of the coil mounting member;
A yoke made of a magnetic material provided at a position facing the outer periphery of the cylindrical coil;
An exterior member comprising the yoke on the inner peripheral side;
Equipped with a,
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 portion, and the cylindrical body portion at an end portion on the cylindrical shaft of the cylindrical body portion. rotary electric machine characterized by Rukoto than the outer diameter of features outside the large diameter diameter of large diameter.   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 molded and extends along a longitudinal direction of the permanent magnet.   3. The rotating electrical machine according to claim 1, wherein the cylindrical body portion of the coil mounting member and substantially the entire inner peripheral surface of the cylindrical coil are fixed with an adhesive. 4. The rotary electric machine according to any one of claims 1 to 3 , wherein 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, 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 4 . The rotating electrical machine according to any one of claims 1 to 5 , wherein the coil mounting member is made of resin. The rotating electrical machine according to claim 6 , wherein the coil mounting member is made of a resin having a flexural modulus of 5000 MPa or more. The rotating electrical machine according to any one of claims 1 to 7 , wherein the exterior member is made of resin. The rotating electrical machine according to claim 8 , wherein the exterior member is made of a resin having a flexural modulus of 5000 MPa or more. 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 whose entire surface is fixed to the outer periphery of the cylindrical body of the coil mounting member;
A yoke made of a magnetic material provided at a position facing the outer periphery of the cylindrical coil;
An exterior member comprising the yoke on the inner peripheral side;
With
The cylindrical body portion, the rotating electric machine you characterized by comprising a pore of the coil mounting member. 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, according to any one of claims 1 to 10, characterized in that in contact with the inner peripheral surface of the bearing holding member which is spaced apart from the coil mounting member Rotating electric machine. 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 disposed on the inner peripheral side of the coil mounting member. The rotating electrical machine according to claim 10 . 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 The rotating electrical machine according to any one of claims 1 to 10 , wherein the surface is in contact with an inner peripheral surface of a bearing holding member that is disposed apart from the coil mounting member. The bearing is rotating electric machine according to any one of claims 11 to 13, characterized in that it is arranged at the end of the shaft. A rotating electric machine according to any one of claims 11 to 14,
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:

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