WO2021230239A1 - Cpap device - Google Patents

Cpap device Download PDF

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Publication number
WO2021230239A1
WO2021230239A1 PCT/JP2021/017896 JP2021017896W WO2021230239A1 WO 2021230239 A1 WO2021230239 A1 WO 2021230239A1 JP 2021017896 W JP2021017896 W JP 2021017896W WO 2021230239 A1 WO2021230239 A1 WO 2021230239A1
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WO
WIPO (PCT)
Prior art keywords
output shaft
permanent magnet
height direction
stator assembly
coil
Prior art date
Application number
PCT/JP2021/017896
Other languages
French (fr)
Japanese (ja)
Inventor
祐三 東山
修 内藤
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2021230239A1 publication Critical patent/WO2021230239A1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the present disclosure relates to a CPAP (Continuous Positive Airway Pressure) device that sends air sucked into the device into the user's airway.
  • CPAP Continuous Positive Airway Pressure
  • the motor described in Patent Document 1 has a stator assembly mounted inside the motor housing.
  • the stator assembly includes a plurality of coils arranged in the circumferential direction.
  • a rotor assembly is arranged inside the stator assembly in the radial direction.
  • the rotor assembly includes permanent magnets arranged to face the coil of the stator assembly.
  • the output shaft is fixed to the rotor assembly. One end side of the output shaft is supported by an insertion hole in the motor housing. Further, the other end side of the output shaft extends to the outside of the motor housing.
  • a fan for blowing air is fixed to the outer part of the output shaft of the motor housing.
  • the output shaft is rotatably supported inside the insertion hole.
  • the output shaft is not firmly supported in the axial direction of the output shaft, it is in a state where it can be displaced in the axial direction. If the output shaft is displaced in the axial direction, the rotating shaft or fan may interfere with the motor housing or the like.
  • one aspect of the present disclosure includes a housing, a motor housed in the housing, and a blower fan rotated by the motor, and the motors are arranged in the circumferential direction.
  • a stator assembly including a plurality of coils, a rotor assembly including a plurality of permanent magnets arranged in the circumferential direction, an output shaft fixed to the rotor assembly and rotating together with the rotor assembly, and a part of the output shaft.
  • the CPAP device is wider than the other side of the winding center axis in the axial direction.
  • the perspective view which shows the CPAP apparatus An exploded perspective view of the CPAP device.
  • the CPAP device 10 includes a flat rectangular parallelepiped housing 20.
  • the thickness direction of the housing 20 is the height direction Td.
  • the longitudinal direction of the housing 20 is the longitudinal direction Ld
  • the lateral direction of the housing 20 is the width direction Wd.
  • An operation unit 21 for operating the CPAP device 10 is provided on the upper side surface 20U, which is the upper surface of the housing 20 in the height direction Td.
  • the operation unit 21 is composed of a circular switch 21A and an annular switch 21B.
  • the switch 21B is arranged so as to surround the switch 21A. Both the switch 21A and the switch 21B are push button switches, and by operating them, it is possible to turn on / off the power of the CPAP device 10 and change the settings.
  • a suction port 22 for introducing air from the outside to the inside of the housing 20 is open.
  • a filter 23 for filtering dust and the like contained in the air introduced into the housing 20 is attached to the suction port 22.
  • the blower 40 is housed inside the housing 20.
  • the blower 40 is arranged close to the first end side of Ld in the longitudinal direction in the housing 20.
  • the blower 40 includes a motor 80, a blower fan 50, and a fan case 61 that covers the blower fan 50.
  • the fan case 61 includes an upper fan case 62 and a lower fan case 63.
  • the lower fan case 63 is fitted to the lower side of the upper fan case 62 so as to face each other.
  • the fan case 61 is roughly classified into a substantially annular fan portion 60 and a lead-out pipe 70 protruding from the fan portion 60.
  • the fan portion 60 in the upper fan case 62 has a substantially circular bowl shape.
  • an introduction port 64 for sucking air is opened inside the fan case 61.
  • the introduction port 64 has a circular shape in a plan view.
  • a plate-shaped projecting wall 65 projects upward from the upper outer surface of the upper fan case 62.
  • a plurality of projecting walls 65 are provided, and in this embodiment, 10 projecting walls 65 are provided.
  • the protruding wall 65 extends in the radial direction of the upper fan case 62. Further, the protruding walls 65 are arranged at equal intervals in the circumferential direction on the radial outer side of the introduction port 64.
  • the fan portion 60 in the lower fan case 63 has a substantially annular shape when viewed from Td in the height direction.
  • the outer diameter of the fan portion 60 of the lower fan case 63 is the same as the outer diameter of the lower edge of the fan portion 60 of the upper fan case 62.
  • the motor 80 is fitted in the hole in the center of the fan portion 60 of the lower fan case 63. The details of the motor 80 will be described later.
  • a substantially circular tubular lead-out tube 70 is connected to the fan portion 60.
  • the lead-out pipe 70 is composed of an upper pipe portion 71 and a lower pipe portion 72.
  • the upper pipe portion 71 extends from the fan portion 60 of the upper fan case 62 toward the first end side in the longitudinal direction Ld.
  • the upper pipe portion 71 has an arc shape that is convex upward when viewed from the extending direction of the upper pipe portion 71. That is, the upper pipe portion 71 constitutes the upper half of the lead-out pipe 70 which is a substantially circular tube.
  • the upper pipe portion 71 is an integrally molded product with the upper fan case 62.
  • the lower pipe portion 72 extends from the fan portion 60 of the lower fan case 63 in the same direction as the upper pipe portion 71.
  • the extended length of the lower pipe portion 72 is the same as that of the upper pipe portion 71.
  • the lower pipe portion 72 has an arc shape that is convex downward when viewed from the extending direction. That is, the lower pipe portion 72 constitutes the lower half of the lead-out pipe 70, which is a substantially circular tube.
  • the lower pipe portion 72 is an integrally molded product with the lower fan case 63.
  • the outlet pipe 70 is connected to a discharge pipe 100 for discharging air from the inside of the housing 20 to the outside.
  • the discharge pipe 100 has a circular tubular shape.
  • the discharge pipe 100 is continuously connected to the downstream end of the outlet pipe 70 in the air flow direction.
  • the discharge pipe 100 penetrates the first end surface 20A of the housing 20 and extends in the longitudinal direction Ld. Therefore, the end on the first end side in the longitudinal direction Ld of the discharge pipe 100 is located on the outside of the housing 20.
  • the opening on the first end side in the longitudinal direction Ld of the discharge pipe 100 is a discharge port 101 for discharging air from the outside to the inside of the housing 20.
  • the mask 140 is connected to the tip of the discharge pipe 100 extending to the outside of the housing 20 via the hose 130.
  • the mask 140 is worn, for example, to cover the nose or mouth of the user 150.
  • the motor 80 includes a base 82 for accommodating and supporting the components of the motor 80.
  • the main body 83 of the base 82 has a bottomed cylindrical shape as a whole. That is, the main body portion 83 has a shape in which the cylindrical side portion 83B protrudes upward in the height direction Td from the edge of the circular bottom portion 83A. From the center of the bottom portion 83A, the shaft support portion 84 projects toward the upper side in the height direction Td.
  • the shaft support portion 84 has a cylindrical shape through which the insertion hole 84A penetrates in the center. Further, the insertion hole 84A penetrates the bottom portion 83A of the main body portion 83.
  • the main body portion 83 is an integrally molded product with the shaft support portion 84.
  • annular stator assembly 85 is arranged as a whole in the space between the shaft support portion 84 and the side portion 83B.
  • the stator yoke 86A in the stator assembly 85 has an annular shape.
  • the radial outer surface of the stator yoke 86A is fixed to the radial inner surface of the side portion 83B.
  • the teeth 86B protrudes inward in the radial direction from the radial inner surface of the stator yoke 86A.
  • the wall portion 86C projects from the radially inner end of the teeth 86B toward the upper side and the lower side of the height direction Td.
  • the amount of protrusion of the wall portion 86C in the height direction Td to the upper side and the lower side is the same amount on both sides.
  • the radial inner surface of the wall portion 86C has a circular arc shape that is convex outward in the radial direction when viewed from the height direction Td.
  • Six teeth 86B are provided.
  • the six teeth 86B are arranged at equal intervals in the circumferential direction of the stator yoke 86A.
  • a coil 87 is attached to each tooth 86B.
  • the coil 87 is composed of a winding 87A wound around the teeth 86B.
  • the winding center axis C of the coil 87 coincides with the radial direction and is orthogonal to the height direction Td. That is, the radial inner end face of the coil 87 extends along the height direction Td. Further, the winding center axis of the coil 87 coincides with the central position of the stator assembly 85 in the height direction Td.
  • the stator yoke 86A, the teeth 86B, and the wall portion 86C are made of magnetic materials, and are made of, for example, an electromagnetic steel plate such as a silicon steel plate.
  • the rotor assembly 88 is arranged inside the stator assembly 85 in the radial direction.
  • the rotor assembly 88 includes a cylindrical rotor yoke 89 and a permanent magnet 90 as a whole.
  • the rotor yoke 89 is composed of a large diameter portion 89A on the lower side in the height direction Td and a small diameter portion 89B on the upper side in the height direction Td.
  • the outer diameter and inner diameter of the small diameter portion 89B are smaller than the outer diameter and inner diameter of the large diameter portion 89A.
  • the inner diameter of the small diameter portion 89B is smaller than the outer diameter of the shaft support portion 84.
  • the inner diameter of the large diameter portion 89A is larger than the outer diameter of the shaft support portion 84.
  • the Td length in the height direction of the large diameter portion 89A is longer than the protruding length of the shaft support portion 84.
  • a shaft support portion 84 is housed inside the large diameter portion 89A.
  • a substantially cylindrical permanent magnet 90 is fixed to the radial outer surface of the large diameter portion 89A of the rotor yoke 89.
  • Four permanent magnets 90 are provided.
  • the four permanent magnets 90 are arranged at equal intervals in the circumferential direction of the rotor yoke 89. Further, the permanent magnet 90 is magnetized so that its radial outer pole is different from that of other adjacent permanent magnets 90.
  • the permanent magnet 90 faces the coil 87 of the stator assembly 85 on the winding center axis C of the coil 87.
  • the dimension of the permanent magnet 90 in the height direction Td is smaller than the dimension of the coil 87 in the height direction Td, and in the height direction Td, all the positions of the permanent magnet 90 are the coil 87. It overlaps with the position of.
  • the position of the lower surface of each permanent magnet 90 in the height direction Td is the same as the position of the lower end of the large diameter portion 89A.
  • the four permanent magnets 90 have a truncated cone shape as a whole.
  • the radial outer surface of the permanent magnet 90 is inclined with respect to the height Td so as to be located from the radial outer side to the inner side from the upper side to the lower side in the height direction Td.
  • a rod-shaped output shaft 81 is press-fitted inside the small diameter portion 89B of the rotor yoke 89 in the radial direction.
  • a part of the lower side of the output shaft 81 in the height direction Td reaches the inside of the large diameter portion 89A.
  • a part of the lower side of the output shaft 81 in the height direction Td is inserted into the insertion hole 84A of the shaft support portion 84 inside the large diameter portion 89A in the radial direction.
  • a slide bearing 91 is interposed between the outer peripheral surface of the output shaft 81 and the inner peripheral surface of the insertion hole 84A.
  • the slide bearing 91 has a cylindrical shape.
  • the outer diameter of the slide bearing 91 is substantially the same as the diameter of the insertion hole 84A. Further, the inner diameter of the slide bearing 91 is several micrometer to several tens of micron larger than the outer diameter of the output shaft 81. Lubricating oil is filled in the slight gap between the inner surface of the slide bearing 91 and the output shaft 81.
  • the axial dimension of the slide bearing 91 is about half of the total length of the output shaft 81.
  • a portion of the output shaft 81 housed in the large diameter portion 89A of the rotor yoke 89 is covered with a slide bearing 91.
  • a nut 92 is arranged below the slide bearing 91 in the height direction Td.
  • the nut 92 covers the insertion hole 84A of the shaft support portion 84 from below.
  • the lower end of the output shaft 81 is supported from below by the support portion 92A of the nut 92.
  • the material of the support portion 92A is a heat-resistant resin. Further, the nut 92 suppresses the lubricating oil filled between the output shaft 81 and the slide bearing 91 from leaking to the lower side of the slide bearing 91 in the height direction Td.
  • An annular flange 93 is covered on the upper opening edge of the base 82 in the height direction Td.
  • the inner diameter of the flange 93 is slightly larger than the outer diameter of the large diameter portion 89A of the rotor yoke 89.
  • the output shaft 81 is covered with the small diameter portion 89B through the hole in the center of the flange 93 and protrudes upward from the flange 93.
  • a blower fan 50 is attached to the tip of the output shaft 81 on the upper side of Td in the height direction via the small diameter portion 89B of the rotor yoke 89 and the tubular body 94.
  • the tubular body 94 is a cylindrical metal member, and is attached to the outer peripheral surface of the small diameter portion 89B of the rotor yoke 89.
  • the blower fan 50 includes a holding plate 51 and a plurality of blades 52.
  • the holding plate 51 has a substantially disk shape. In this embodiment, the holding plate 51 is shaped so as to bulge upward toward the center. At the center of the holding plate 51, a circular through hole 53 is opened.
  • the output shaft 81 is fixed to the through hole 53 via the tubular body 94 and the small diameter portion 89B.
  • a plurality of blades 52 project upward on the upper surface of the holding plate 51.
  • the blade 52 has a plate shape.
  • the blade 52 extends from the radial inside to the outside of the holding plate 51.
  • blades 52 having different extending lengths are provided.
  • the blades 52 are arranged at equal intervals in the circumferential direction of the holding plate 51. Therefore, the plurality of blades 52 are arranged radially when viewed from the height direction Td.
  • a storage space S1 in which the blower fan 50 is housed and a flow passage S2 through which the air blown from the blower fan 50 flows are partitioned.
  • the accommodation space S1 is composed of a radial central portion of the internal space of the fan portion 60.
  • the accommodation space S1 is a space sandwiched in the vertical direction between the upper surface of the flange 93 and the inner surface of the upper fan case 62. Therefore, the accommodation space S1 directly communicates with the outside of the fan case 61 via the introduction port 64.
  • the flow passage S2 is composed of a radial outer portion of the internal space of the fan portion 60.
  • the flow passage S2 is a space sandwiched in the vertical direction between the inner surface of the lower fan case 63 and the inner surface of the upper fan case 62. Therefore, the flow passage S2 extends in an annular shape on the radial outside of the accommodation space S1. Further, the flow passage S2 communicates with the accommodation space S1 in the radial direction. In this embodiment, the flow passage S2 has a substantially circular shape in a cross-sectional view orthogonal to the extending direction of the flow passage S2.
  • the gap G becomes wider toward the lower side in the height direction Td. Therefore, in the height direction Td, the average of the gap G below the winding center axis C of the coil 87 is wider than the average of the gap G above the winding center axis C of the coil 87. That is, in the gap G, the portion above the winding center axis C is wider than the portion below the winding center axis C.
  • the blower fan 50 is fixed to the upper end of the output shaft 81 in the height direction Td. Therefore, in this embodiment, the blower fan 50 is fixed to the side where the gap G is widened in the height direction Td.
  • the rotor assembly 88 rotates due to the electromagnetic force generated between the coil 87 and the permanent magnet 90.
  • the output shaft 81 and the blower fan 50 rotate.
  • the blower fan 50 rotates, the air outside the blower 40 is sucked into the fan case 61 through the introduction port 64.
  • the air is guided to the flow passage S2 of the fan case 61 by the centrifugal force of the blower fan 50.
  • the air circulates in the flow passage S2 in the circumferential direction in accordance with the rotation of the blower fan 50.
  • the flow velocity and pressure of the air increase due to the rotation of the blower fan 50.
  • the air that has passed through the flow passage S2 passes through the outlet pipe 70 and the discharge pipe 100 and is discharged to the outside of the blower 40.
  • blower fan 50 rotates, air is introduced into the fan case 61 from the introduction port 64.
  • the blower fan 50 When air is introduced into the fan case 61, the blown air flows at a correspondingly high speed in the accommodation space S1 and the flow passage S2 in the inside of the fan case 61.
  • the air flow is slower than that in the accommodation space S1 and the flow passage S2. Therefore, due to the difference in the flow velocity of the air, the pressure in the space between the blower fan 50 and the motor 80 becomes larger than that in the accommodation space S1 which is the upper portion of the blower fan 50. Therefore, a force is applied to the blower fan 50 so as to be pushed upward in the height direction Td due to the pressure difference between the upper portion and the lower portion of the blower fan 50.
  • the gap G between the permanent magnet 90 and the stator assembly 85 is wider on the lower side in the height direction Td than on the upper side in the height direction Td. That is, in the gap G, the portion above the winding center axis C is wider than the portion below the winding center axis C. Therefore, when electric power is supplied to the motor 80 and an electromagnetic force is generated between the coil 87 and the permanent magnet 90, a force that tries to attract the permanent magnet 90 and the stator assembly 85 is generated. At this time, a force that attracts the permanent magnet 90 toward the winding center axis C of the coil 87 acts as a whole.
  • the gap G between the permanent magnet 90 and the stator assembly 85 is wider in the lower side in the height direction Td than in the upper side in the height direction. Therefore, the upper portion of the permanent magnet 90 in the height direction Td is pulled more strongly toward the winding center axis C of the coil 87 than the lower portion. As a result, due to the difference in the force pulled by the coil 87 between the upper portion and the lower portion of the permanent magnet 90, the permanent magnet 90 also exerts a force from the upper side to the lower side in the height direction Td. .. As a result, it is possible to prevent the rotor assembly 88 and the blower fan 50 from being displaced above the Td in the height direction.
  • the rotor assembly 88 is arranged radially inside the stator assembly 85. Therefore, the radial dimension of the rotor assembly 88 can be reduced as compared with the case where the rotor assembly 88 is arranged radially outside the stator assembly 85. Therefore, even if the rotor assembly 88 receives a force that pulls the rotor assembly 88 in the height direction Td, the problem that the output shaft 81 shakes with respect to the height direction Td is unlikely to occur.
  • the slide bearing 91 is interposed between the inner peripheral surface of the insertion hole 84A and the outer peripheral surface of the output shaft 81.
  • the plain bearing 91 supports the output shaft 81 in a relatively long range in the axial direction of the output shaft 81. Therefore, even if the rotor assembly 88 is subjected to a force that is pulled in the height direction Td, problems such as the output shaft 81 being shaken with respect to the height direction Td are unlikely to occur.
  • changing the gap G in the height direction Td means that the height of the portion below the height direction Td on the radial outer surface of the permanent magnet 90 is increased. This is achieved by locating it closer to the output shaft 81 than the location above the direction Td. In particular, in the present embodiment, it is realized by inclining the radial outer surface of the permanent magnet 90 with respect to the height direction Td. With this configuration, the gap G can be changed only by changing the outer shape of the permanent magnet 90, and the design of other members cannot be changed.
  • blower fan 50 may be displaced toward the upper side in the height direction Td together with the output shaft 81 and the rotor assembly 88 so as to be lifted.
  • the gap G between the permanent magnet 90 and the stator assembly 85 is narrower toward the blower fan 50 side in the height direction Td. Therefore, the force that the blower fan 50 tends to move toward the upper side of Td in the height direction can be offset by the electromagnetic force of the coil 87. Therefore, it is possible to prevent the output shaft 81 and the rotor assembly 88 from moving to the upper side in the height direction Td.
  • the CPAP device 10 may include a device different from the blower 40.
  • the CPAP device 10 may include a humidifier.
  • a humidifier is provided, for example, it is preferable to attach the humidifier to the discharge pipe 100 of the housing 20 and attach the hose 130 to the discharge side of the humidifier.
  • the shape of the blower 40 is not limited to the example of the above embodiment.
  • the outer shape of the fan case 61 is rectangular parallelepiped. It may be a polygonal shape.
  • the lead-out pipe 70 may be extended or curved so that the inner diameter is widened.
  • the fan case 61 can be omitted.
  • the housing 20 may be shaped so as to partition the space corresponding to the flow passage S2 of the fan case 61.
  • the configuration of the motor 80 is not limited to the above embodiment. As long as the motor 80 includes an output shaft 81, a rotor assembly 88, a stator assembly 85, and a base 82, other members may not be included, or configurations other than the above-described embodiment may be included. .. Further, the configuration of the motor 80 may be a so-called outer rotor type. That is, the rotor assembly 88 may be arranged radially outside the stator assembly 85. Further, for example, a rolling bearing may be used instead of the sliding bearing 91.
  • the base 82 may have any shape as long as it can support the output shaft 81.
  • the base 82 has only the shaft support portion 84, and may not include the main body portion 83.
  • the wall portion 86C of the stator assembly 85 may be omitted.
  • the distance between the coil 87 and the permanent magnet 90 is the gap G.
  • the magnetized portion of the permanent magnet 90 is not limited to the example of the above embodiment.
  • the permanent magnet 90 may be magnetized so that the outer poles in the radial direction are different every 45 degrees in the circumferential direction. That is, the number of permanent magnets 90 does not have to be four.
  • the position of the permanent magnet 90 and the position of the stator assembly 85 do not have to overlap in the entire range of the permanent magnet 90 in the height direction Td. It is sufficient that the permanent magnet 90 partially faces the coil 87 in the radial direction and the permanent magnet 90 is located on the winding center axis C of the coil 87. Even in this case, the gap G may be wider in the upper portion in the height direction Td with the winding center axis C as the boundary than in the lower portion.
  • the winding center axis C of the coil 87 may be inclined with respect to the radial direction.
  • the radial inner surface of the coil 87 is formed.
  • the gap G between the permanent magnet 90 and the stator assembly 85 does not have to gradually widen from the upper side to the lower side in the height direction Td.
  • the radial outer surface of the permanent magnet 90 may be stepped, and the gap G may be discontinuously widened from the upper side to the lower side in the height direction Td.
  • the lower portion of the height direction Td should be located closer to the output shaft 81 than the upper portion of the height direction Td. Can be realized.
  • the gap G between the permanent magnet 90 and the stator assembly 85 may widen from the lower side to the upper side of the Td in the height direction.
  • the permanent magnet 90 has a truncated cone shape.
  • the radial outer surface of the permanent magnet 90 is inclined with respect to the height Td so as to be located from the radial outer side to the inner side from the lower side to the upper side of the height direction Td. Therefore, the gap G between the permanent magnet 90 and the stator assembly 85 is wider toward the upper side in the height direction Td than from the lower side in the height direction Td.
  • the permanent magnet 90 is pulled to the upper side of the height direction Td by the attractive force between the permanent magnet 90 and the stator assembly 85, so that the entire rotor assembly 88 including the permanent magnet 90 is moved to the upper side of the height direction Td. Be pulled.
  • the blower fan 50 fixed to the rotor assembly 88 is also pulled upward in the height direction Td. Therefore, it is possible to prevent the blower fan 50 and the output shaft 81 from being displaced below the Td in the height direction.
  • the position of the winding center axis C of the coil 87 may be referred to as a reference height in the length direction (height direction Td) of the output shaft 81.
  • a reference height in the length direction (height direction Td) of the output shaft 81, an arbitrary position (upper side in FIG. 5) closer to the tip of the output shaft 81 than the reference height may be referred to as a first height position. ..
  • a second height position In the length direction (height direction Td) of the output shaft 81, an arbitrary position (lower side in FIG. 5) closer to the base end of the output shaft 81 than the reference position or the reference height is referred to as a second height position.
  • the radial outward surface of the permanent magnet 90 and the radial inward surface of the stator assembly 85 may be separated by a radial reference distance at a reference height position in the length direction (height direction Td) of the output shaft 81. , At the first height position, they may be separated by a first radial distance smaller than the radial reference distance, and at the second height position, only a second radial distance larger than the radial reference distance. May be separated.

Abstract

One aspect of the present disclosure provides a CPAP device that reduces a positional deviation in an axial direction of an output shaft of a motor. A motor (80) of a CPAP device according to one aspect of the present disclosure includes: a stator assembly (85) including a coil (87) and having an annular shape as a whole; a rotor assembly (88) disposed radially inside the stator assembly (85); and an output shaft (81) that rotates with the rotor assembly (88). The output shaft (81) extends in a height direction (Td), and is inserted into an insertion hole (84A) of a base (82). A permanent magnet (90) of the rotor assembly (88) faces the stator assembly (85) in a radial direction. The permanent magnet (90) faces a coil (87) of the stator assembly (85) on a winding central axis (C) of the coil (87) of the stator assembly (85). A gap (G) between the permanent magnet (90) and the stator assembly (85) is wider in a portion on an upper side in the height direction (Td) relative to the winding central axis (C) than in a portion on a lower side in the height direction (Td) relative to the winding central axis (C) .

Description

ＣＰＡＰ装置CPAP device
　本開示は、装置内に吸入した空気を使用者の気道に送り込むＣＰＡＰ（Continuous Positive Airway Pressure）装置に関する。 The present disclosure relates to a CPAP (Continuous Positive Airway Pressure) device that sends air sucked into the device into the user's airway.
　特許文献１に記載のモータは、モータハウジングの内部にステータアッシーが取り付けられている。ステータアッシーは、周方向に並べられた複数のコイルを備えている。ステータアッシーの径方向内側には、ロータアッシーが配置されている。ロータアッシーは、ステータアッシーのコイルと対向するように配置された永久磁石を備えている。ロータアッシーには、出力軸が固定されている。出力軸の一端側は、モータハウジングの挿入穴に支持されている。また、出力軸の他端側は、モータハウジングの外部まで延びている。出力軸のうちモータハウジングの外部の部分には、送風用のファンが固定されている。 The motor described in Patent Document 1 has a stator assembly mounted inside the motor housing. The stator assembly includes a plurality of coils arranged in the circumferential direction. A rotor assembly is arranged inside the stator assembly in the radial direction. The rotor assembly includes permanent magnets arranged to face the coil of the stator assembly. The output shaft is fixed to the rotor assembly. One end side of the output shaft is supported by an insertion hole in the motor housing. Further, the other end side of the output shaft extends to the outside of the motor housing. A fan for blowing air is fixed to the outer part of the output shaft of the motor housing.
特開２００９－１４２０２７号公報Japanese Unexamined Patent Publication No. 2009-14202
　特許文献１に記載のようなモータにおいて、出力軸は、挿入穴の内部で、回転可能に支持されている。とはいえ、出力軸は、当該出力軸の軸線方向に強固に支持されているわけではないため、軸線方向には位置ずれし得る状態となっている。仮に、出力軸が軸線方向に位置ずれした場合、回転シャフトやファンが、モータハウジング等と干渉する虞がある。 In a motor as described in Patent Document 1, the output shaft is rotatably supported inside the insertion hole. However, since the output shaft is not firmly supported in the axial direction of the output shaft, it is in a state where it can be displaced in the axial direction. If the output shaft is displaced in the axial direction, the rotating shaft or fan may interfere with the motor housing or the like.
　上記課題を解決するため、本開示の一態様は、ハウジングと、前記ハウジング内に収容されたモータと、前記モータによって回転される送風ファンとを備え、前記モータは、周方向に並べられている複数のコイルを含むステータアッシーと、前記周方向に並べられている複数の永久磁石を含むロータアッシーと、前記ロータアッシーに固定され、前記ロータアッシーと共に回転する出力軸と、前記出力軸の一部が挿入される挿入穴を有し、前記出力軸を支持するベースと、を有しており、前記永久磁石は、前記出力軸の軸線方向に直交する径方向において少なくとも部分的に前記コイルと対向しているとともに、前記コイルの巻き中心軸上に位置しており、前記径方向における前記永久磁石と前記ステータアッシーとの隙間において、前記巻き中心軸よりも前記軸線方向の一方側の箇所の方が、前記巻き中心軸よりも前記軸線方向の他方側の箇所よりも、広くなっているＣＰＡＰ装置である。 In order to solve the above problems, one aspect of the present disclosure includes a housing, a motor housed in the housing, and a blower fan rotated by the motor, and the motors are arranged in the circumferential direction. A stator assembly including a plurality of coils, a rotor assembly including a plurality of permanent magnets arranged in the circumferential direction, an output shaft fixed to the rotor assembly and rotating together with the rotor assembly, and a part of the output shaft. Has an insertion hole into which the output shaft is inserted, and has a base that supports the output shaft, and the permanent magnet is at least partially opposed to the coil in a radial direction orthogonal to the axial direction of the output shaft. At the same time, it is located on the winding center axis of the coil, and in the gap between the permanent magnet and the stator assembly in the radial direction, one side of the winding center axis in the axial direction. However, the CPAP device is wider than the other side of the winding center axis in the axial direction.
　上記構成によれば、コイルに電流が流されると、ロータアッシーの永久磁石とステータアッシーのコイルとを引き合わせようとする力が発生する。このとき、永久磁石には、全体として、コイルの巻き中心軸に向かって引き付けられるような力が作用する。そして、永久磁石とステータアッシーとの間の隙間において、出力軸の軸線方向における一方側の箇所の方が他方側の箇所よりも広くなっている。そのため、永久磁石のうち、出力軸の軸線方向における他方側の部分は、一方側の部分と比べて、より強くコイルの巻き中心軸に向かって引っ張られる。その結果、永久磁石の他方側の部分と一方側の部分との引かれる力の差によって、永久磁石は、軸線方向における他方側から一方側に向かって力が作用する。よって、ロータアッシーや送風ファンが、出力軸の軸線方向において永久磁石がずれている側に位置ずれすることを抑制できる。 According to the above configuration, when a current is passed through the coil, a force is generated to attract the permanent magnet of the rotor assembly and the coil of the stator assembly. At this time, a force that attracts the permanent magnet toward the winding center axis of the coil acts as a whole. Then, in the gap between the permanent magnet and the stator assembly, the portion on one side of the output shaft in the axial direction is wider than the portion on the other side. Therefore, the portion of the permanent magnet on the other side in the axial direction of the output shaft is pulled more strongly toward the winding center axis of the coil than the portion on the one side. As a result, due to the difference in the attractive force between the other side portion and the one side portion of the permanent magnet, the force acts on the permanent magnet from the other side to the one side in the axial direction. Therefore, it is possible to prevent the rotor assembly and the blower fan from being displaced to the side where the permanent magnet is displaced in the axial direction of the output shaft.
　ロータアッシーが、ステータアッシーに対して出力軸の軸線方向に位置ずれすることを抑制できる。 It is possible to prevent the rotor assembly from shifting in the axial direction of the output shaft with respect to the stator assembly.
ＣＰＡＰ装置を示す斜視図。The perspective view which shows the CPAP apparatus. ＣＰＡＰ装置の分解斜視図。An exploded perspective view of the CPAP device. ＣＰＡＰ装置における送風ファンの分解斜視図。An exploded perspective view of a blower fan in a CPAP device. ＣＰＡＰ装置におけるモータの分解図。Exploded view of the motor in the CPAP device. ＣＰＡＰ装置におけるブロアの端面図。End view of the blower in the CPAP device. ＣＰＡＰ装置の使用状態を説明する説明図。An explanatory diagram illustrating a usage state of a CPAP device. 変更例のＣＰＡＰ装置におけるモータの端面図。The end view of the motor in the CPAP device of the modification example.
　以下、装置内に導入した空気を使用者の気道に送り込むＣＰＡＰ装置の実施形態について、図面を参照して説明する。 Hereinafter, an embodiment of the CPAP device that sends the air introduced into the device into the airway of the user will be described with reference to the drawings.
　図１に示すように、ＣＰＡＰ装置１０は、扁平な直方体状のハウジング２０を備えている。なお、以下の説明では、ハウジング２０の厚み方向を高さ方向Ｔｄとする。また、高さ方向Ｔｄから視た場合に、ハウジング２０の長手方向を長手方向Ｌｄとし、ハウジング２０の短手方向を幅方向Ｗｄとする。 As shown in FIG. 1, the CPAP device 10 includes a flat rectangular parallelepiped housing 20. In the following description, the thickness direction of the housing 20 is the height direction Td. Further, when viewed from the height direction Td, the longitudinal direction of the housing 20 is the longitudinal direction Ld, and the lateral direction of the housing 20 is the width direction Wd.
　ハウジング２０の高さ方向Ｔｄの上側の面である上側面２０Ｕには、ＣＰＡＰ装置１０を操作するための操作部２１が設けられている。この実施形態では、操作部２１は、円形状のスイッチ２１Ａと、円環状のスイッチ２１Ｂと、で構成されている。スイッチ２１Ｂは、スイッチ２１Ａを取り囲むように配置されている。スイッチ２１Ａ及びスイッチ２１Ｂは、いずれも押しボタンスイッチであり、これらを操作することで、ＣＰＡＰ装置１０の電源のオンオフ、設定の変更等が可能になっている。 An operation unit 21 for operating the CPAP device 10 is provided on the upper side surface 20U, which is the upper surface of the housing 20 in the height direction Td. In this embodiment, the operation unit 21 is composed of a circular switch 21A and an annular switch 21B. The switch 21B is arranged so as to surround the switch 21A. Both the switch 21A and the switch 21B are push button switches, and by operating them, it is possible to turn on / off the power of the CPAP device 10 and change the settings.
　ハウジング２０における長手方向Ｌｄの第１端側の端面である第１端面２０Ａにおいては、ハウジング２０の外部から内部に空気を導入するための吸入口２２が開口している。吸入口２２には、ハウジング２０内へと導入される空気に含まれる塵等をろ過するフィルタ２３が取り付けられている。 In the first end surface 20A, which is the end surface on the first end side of the longitudinal direction Ld in the housing 20, a suction port 22 for introducing air from the outside to the inside of the housing 20 is open. A filter 23 for filtering dust and the like contained in the air introduced into the housing 20 is attached to the suction port 22.
　図２に示すように、ハウジング２０の内部には、ブロア４０が収容されている。ブロア４０は、ハウジング２０において長手方向Ｌｄの第１端側に寄せて配置されている。図３に示すように、ブロア４０は、モータ８０と、送風ファン５０と、送風ファン５０を覆うファンケース６１とを備えている。 As shown in FIG. 2, the blower 40 is housed inside the housing 20. The blower 40 is arranged close to the first end side of Ld in the longitudinal direction in the housing 20. As shown in FIG. 3, the blower 40 includes a motor 80, a blower fan 50, and a fan case 61 that covers the blower fan 50.
　図３に示すように、ファンケース６１は、上側ファンケース６２と下側ファンケース６３とを備えている。上側ファンケース６２の下側に、下側ファンケース６３が対向するように嵌め合わされている。また、図２に示すようにファンケース６１は、略円環状のファン部６０とファン部６０から突出している導出管７０とに大別される。 As shown in FIG. 3, the fan case 61 includes an upper fan case 62 and a lower fan case 63. The lower fan case 63 is fitted to the lower side of the upper fan case 62 so as to face each other. Further, as shown in FIG. 2, the fan case 61 is roughly classified into a substantially annular fan portion 60 and a lead-out pipe 70 protruding from the fan portion 60.
　図３に示すように、上側ファンケース６２におけるファン部６０は、略円形の椀形状になっている。上側ファンケース６２におけるファン部６０の中央には、ファンケース６１内部に空気を吸入するための導入口６４が開口している。導入口６４は、平面視で円形状になっている。上側ファンケース６２の上側の外面からは、板状の突出壁６５が、上側に向かって突出している。突出壁６５は、複数個設けられており、本実施形態では、１０個の突出壁６５が設けられている。突出壁６５は、上側ファンケース６２の径方向に延びている。また、各突出壁６５は、導入口６４の径方向外側を周方向に等間隔毎に配置されている。 As shown in FIG. 3, the fan portion 60 in the upper fan case 62 has a substantially circular bowl shape. At the center of the fan portion 60 in the upper fan case 62, an introduction port 64 for sucking air is opened inside the fan case 61. The introduction port 64 has a circular shape in a plan view. A plate-shaped projecting wall 65 projects upward from the upper outer surface of the upper fan case 62. A plurality of projecting walls 65 are provided, and in this embodiment, 10 projecting walls 65 are provided. The protruding wall 65 extends in the radial direction of the upper fan case 62. Further, the protruding walls 65 are arranged at equal intervals in the circumferential direction on the radial outer side of the introduction port 64.
　下側ファンケース６３におけるファン部６０は、高さ方向Ｔｄから視た場合に、略円環状となっている。下側ファンケース６３のファン部６０の外径は、上側ファンケース６２のファン部６０の下縁の外径と同じになっている。下側ファンケース６３のファン部６０の中央の穴には、モータ８０が嵌め込まれている。なお、モータ８０の詳細については後述する。 The fan portion 60 in the lower fan case 63 has a substantially annular shape when viewed from Td in the height direction. The outer diameter of the fan portion 60 of the lower fan case 63 is the same as the outer diameter of the lower edge of the fan portion 60 of the upper fan case 62. The motor 80 is fitted in the hole in the center of the fan portion 60 of the lower fan case 63. The details of the motor 80 will be described later.
　図３に示すように、ファン部６０には、略円管状の導出管７０が接続されている。導出管７０は、上側管部７１と、下側管部７２と、で構成されている。 As shown in FIG. 3, a substantially circular tubular lead-out tube 70 is connected to the fan portion 60. The lead-out pipe 70 is composed of an upper pipe portion 71 and a lower pipe portion 72.
　上側管部７１は、上側ファンケース６２のファン部６０から、長手方向Ｌｄの第１端側に向かって延びている。上側管部７１は、上側管部７１の延び方向から視た場合に、上側に凸の円弧状となっている。すなわち、上側管部７１は、略円管状である導出管７０の上側半分を構成している。なお、本実施形態においては、上側管部７１は、上側ファンケース６２との一体成形物である。 The upper pipe portion 71 extends from the fan portion 60 of the upper fan case 62 toward the first end side in the longitudinal direction Ld. The upper pipe portion 71 has an arc shape that is convex upward when viewed from the extending direction of the upper pipe portion 71. That is, the upper pipe portion 71 constitutes the upper half of the lead-out pipe 70 which is a substantially circular tube. In the present embodiment, the upper pipe portion 71 is an integrally molded product with the upper fan case 62.
　下側管部７２は、下側ファンケース６３のファン部６０から、上側管部７１と同方向に延びている。下側管部７２の延設長さは、上側管部７１と同じになっている。下側管部７２は、延び方向から視た場合に、下側に凸の円弧状となっている。すなわち、下側管部７２は、略円管状である導出管７０の下側半分を構成している。なお、本実施形態においては、下側管部７２は、下側ファンケース６３との一体成形物である。 The lower pipe portion 72 extends from the fan portion 60 of the lower fan case 63 in the same direction as the upper pipe portion 71. The extended length of the lower pipe portion 72 is the same as that of the upper pipe portion 71. The lower pipe portion 72 has an arc shape that is convex downward when viewed from the extending direction. That is, the lower pipe portion 72 constitutes the lower half of the lead-out pipe 70, which is a substantially circular tube. In the present embodiment, the lower pipe portion 72 is an integrally molded product with the lower fan case 63.
　図２に示すように、導出管７０には、ハウジング２０の内部から外部へと空気を排出するための排出管１００が接続されている。排出管１００は、円管状となっている。排出管１００は、導出管７０の空気流れ方向下流の端と連続して繋がっている。 As shown in FIG. 2, the outlet pipe 70 is connected to a discharge pipe 100 for discharging air from the inside of the housing 20 to the outside. The discharge pipe 100 has a circular tubular shape. The discharge pipe 100 is continuously connected to the downstream end of the outlet pipe 70 in the air flow direction.
　排出管１００は、ハウジング２０の第１端面２０Ａを貫通して、長手方向Ｌｄに延びている。そのため、排出管１００の長手方向Ｌｄにおける第１端側の端は、ハウジング２０の外側に位置している。排出管１００の長手方向Ｌｄにおける第１端側の開口は、ハウジング２０の外部から内部へと空気を排出するための排出口１０１となっている。 The discharge pipe 100 penetrates the first end surface 20A of the housing 20 and extends in the longitudinal direction Ld. Therefore, the end on the first end side in the longitudinal direction Ld of the discharge pipe 100 is located on the outside of the housing 20. The opening on the first end side in the longitudinal direction Ld of the discharge pipe 100 is a discharge port 101 for discharging air from the outside to the inside of the housing 20.
　図６に示すように、ＣＰＡＰ装置１０を使用する際には、ハウジング２０の外部に延びている排出管１００の先端部に、ホース１３０を介してマスク１４０が接続される。マスク１４０は、例えば、使用者１５０の鼻又は口を覆うように装着される。 As shown in FIG. 6, when the CPAP device 10 is used, the mask 140 is connected to the tip of the discharge pipe 100 extending to the outside of the housing 20 via the hose 130. The mask 140 is worn, for example, to cover the nose or mouth of the user 150.
　図４に示すようにモータ８０は、当該モータ８０の構成部品を収容及び支持するためのベース８２を備えている。ベース８２の本体部８３は、全体として有底な円筒状になっている。すなわち、本体部８３は、円形の底部８３Ａの縁から円筒状の側部８３Ｂが高さ方向Ｔｄの上側へ突出した形状になっている。底部８３Ａの中央からは、高さ方向Ｔｄの上側に向って軸支部８４が突出している。軸支部８４は、中央に挿入穴８４Ａが貫通した筒状になっている。また、挿入穴８４Ａは、本体部８３の底部８３Ａを貫通している。なお、本実施形態において、本体部８３は、軸支部８４との一体成形物である。 As shown in FIG. 4, the motor 80 includes a base 82 for accommodating and supporting the components of the motor 80. The main body 83 of the base 82 has a bottomed cylindrical shape as a whole. That is, the main body portion 83 has a shape in which the cylindrical side portion 83B protrudes upward in the height direction Td from the edge of the circular bottom portion 83A. From the center of the bottom portion 83A, the shaft support portion 84 projects toward the upper side in the height direction Td. The shaft support portion 84 has a cylindrical shape through which the insertion hole 84A penetrates in the center. Further, the insertion hole 84A penetrates the bottom portion 83A of the main body portion 83. In this embodiment, the main body portion 83 is an integrally molded product with the shaft support portion 84.
　ベース８２において、軸支部８４と側部８３Ｂとの間の空間には、全体として円環状のステータアッシー８５が配置されている。ステータアッシー８５におけるステータヨーク８６Ａは、円環状になっている。ステータヨーク８６Ａの径方向外側の面は、側部８３Ｂの径方向内側の面に固定されている。 In the base 82, an annular stator assembly 85 is arranged as a whole in the space between the shaft support portion 84 and the side portion 83B. The stator yoke 86A in the stator assembly 85 has an annular shape. The radial outer surface of the stator yoke 86A is fixed to the radial inner surface of the side portion 83B.
　図５に示すように、ステータヨーク８６Ａの径方向内側の面からは、ティース８６Ｂが径方向内側に向けて突出している。ティース８６Ｂの径方向内側の端からは、高さ方向Ｔｄの上側及び下側に向けて壁部８６Ｃが突出している。壁部８６Ｃの高さ方向Ｔｄの上側及び下側への突出量は、両側とも同じ量となっている。壁部８６Ｃの径方向内側の面は、高さ方向Ｔｄから視たときに、径方向外側に凸の円弧状となっている。ティース８６Ｂは６つ備えられている。６つのティース８６Ｂは、ステータヨーク８６Ａの周方向に等間隔に並んでいる。各ティース８６Ｂには、コイル８７が取り付けられている。コイル８７は、ティース８６Ｂに巻回された巻き線８７Ａによって構成されている。コイル８７の巻き中心軸Ｃは、径方向と一致しており、高さ方向Ｔｄと直交している。すなわち、コイル８７の径方向内側の端面は、高さ方向Ｔｄに沿って延びている。また、コイル８７の巻き中心軸は、ステータアッシー８５の高さ方向Ｔｄにおける中央の位置と一致している。ステータヨーク８６Ａ、ティース８６Ｂ及び壁部８６Ｃは、磁性材料となっており、例えば、ケイ素鋼板等の電磁鋼板からなる。 As shown in FIG. 5, the teeth 86B protrudes inward in the radial direction from the radial inner surface of the stator yoke 86A. The wall portion 86C projects from the radially inner end of the teeth 86B toward the upper side and the lower side of the height direction Td. The amount of protrusion of the wall portion 86C in the height direction Td to the upper side and the lower side is the same amount on both sides. The radial inner surface of the wall portion 86C has a circular arc shape that is convex outward in the radial direction when viewed from the height direction Td. Six teeth 86B are provided. The six teeth 86B are arranged at equal intervals in the circumferential direction of the stator yoke 86A. A coil 87 is attached to each tooth 86B. The coil 87 is composed of a winding 87A wound around the teeth 86B. The winding center axis C of the coil 87 coincides with the radial direction and is orthogonal to the height direction Td. That is, the radial inner end face of the coil 87 extends along the height direction Td. Further, the winding center axis of the coil 87 coincides with the central position of the stator assembly 85 in the height direction Td. The stator yoke 86A, the teeth 86B, and the wall portion 86C are made of magnetic materials, and are made of, for example, an electromagnetic steel plate such as a silicon steel plate.
　図４に示すように、ステータアッシー８５の径方向内側には、ロータアッシー８８が配置されている。ロータアッシー８８は、全体として円筒状のロータヨーク８９と永久磁石９０とを備えている。ロータヨーク８９は、高さ方向Ｔｄの下側の大径部８９Ａと、高さ方向Ｔｄの上側の小径部８９Ｂとで構成されている。小径部８９Ｂの外径及び内径は、大径部８９Ａの外径及び内径よりも小さくなっている。図５に示すように、小径部８９Ｂの内径は、軸支部８４の外径よりも小さくなっている。また、大径部８９Ａの内径は、軸支部８４の外径よりも大きくなっている。大径部８９Ａの高さ方向Ｔｄ長さは軸支部８４の突出長よりも長くなっている。大径部８９Ａの内部には、軸支部８４が収容されている。 As shown in FIG. 4, the rotor assembly 88 is arranged inside the stator assembly 85 in the radial direction. The rotor assembly 88 includes a cylindrical rotor yoke 89 and a permanent magnet 90 as a whole. The rotor yoke 89 is composed of a large diameter portion 89A on the lower side in the height direction Td and a small diameter portion 89B on the upper side in the height direction Td. The outer diameter and inner diameter of the small diameter portion 89B are smaller than the outer diameter and inner diameter of the large diameter portion 89A. As shown in FIG. 5, the inner diameter of the small diameter portion 89B is smaller than the outer diameter of the shaft support portion 84. Further, the inner diameter of the large diameter portion 89A is larger than the outer diameter of the shaft support portion 84. The Td length in the height direction of the large diameter portion 89A is longer than the protruding length of the shaft support portion 84. A shaft support portion 84 is housed inside the large diameter portion 89A.
　図４及び図５に示すように、ロータヨーク８９の大径部８９Ａの径方向外側の面には、略円筒状の永久磁石９０が固定されている。永久磁石９０は４つ設けられている。４つの永久磁石９０は、ロータヨーク８９の周方向に等間隔に並んでいる。また、永久磁石９０は、隣り合う他の永久磁石９０とは、径方向外側の極が異なるように着磁されている。図５に示すように、永久磁石９０は、コイル８７の巻き中心軸Ｃ上でステータアッシー８５のコイル８７と対向している。本実施形態においては、永久磁石９０の高さ方向Ｔｄの寸法は、コイル８７の高さ方向Ｔｄの寸法より小さくなっており、高さ方向Ｔｄにおいて、永久磁石９０の全ての位置は、コイル８７の位置と重複している。各永久磁石９０の下面の高さ方向Ｔｄの位置は大径部８９Ａの下端の位置と同じ位置となっている。 As shown in FIGS. 4 and 5, a substantially cylindrical permanent magnet 90 is fixed to the radial outer surface of the large diameter portion 89A of the rotor yoke 89. Four permanent magnets 90 are provided. The four permanent magnets 90 are arranged at equal intervals in the circumferential direction of the rotor yoke 89. Further, the permanent magnet 90 is magnetized so that its radial outer pole is different from that of other adjacent permanent magnets 90. As shown in FIG. 5, the permanent magnet 90 faces the coil 87 of the stator assembly 85 on the winding center axis C of the coil 87. In the present embodiment, the dimension of the permanent magnet 90 in the height direction Td is smaller than the dimension of the coil 87 in the height direction Td, and in the height direction Td, all the positions of the permanent magnet 90 are the coil 87. It overlaps with the position of. The position of the lower surface of each permanent magnet 90 in the height direction Td is the same as the position of the lower end of the large diameter portion 89A.
　図４に示すように、４つの永久磁石９０は全体として、円錐台筒状となっている。永久磁石９０の径方向外側の面は、高さ方向Ｔｄの上側から下側に向かうほど、径方向外側から内側に位置するように、高さ方向Ｔｄに対して傾斜している。 As shown in FIG. 4, the four permanent magnets 90 have a truncated cone shape as a whole. The radial outer surface of the permanent magnet 90 is inclined with respect to the height Td so as to be located from the radial outer side to the inner side from the upper side to the lower side in the height direction Td.
　ロータヨーク８９の小径部８９Ｂの径方向内側には、棒状の出力軸８１が圧入されている。出力軸８１の高さ方向Ｔｄの下側の一部は、大径部８９Ａの内部にまで至っている。そして、出力軸８１の高さ方向Ｔｄの下側の一部は、大径部８９Ａの径方向内側において、軸支部８４の挿入穴８４Ａに挿入されている。また、出力軸８１の外周面と挿入穴８４Ａの内周面との間にはすべり軸受９１が介在されている。 A rod-shaped output shaft 81 is press-fitted inside the small diameter portion 89B of the rotor yoke 89 in the radial direction. A part of the lower side of the output shaft 81 in the height direction Td reaches the inside of the large diameter portion 89A. A part of the lower side of the output shaft 81 in the height direction Td is inserted into the insertion hole 84A of the shaft support portion 84 inside the large diameter portion 89A in the radial direction. Further, a slide bearing 91 is interposed between the outer peripheral surface of the output shaft 81 and the inner peripheral surface of the insertion hole 84A.
　すべり軸受９１は円筒状である。当該すべり軸受９１の外径は、挿入穴８４Ａの径と略同じになっている。また、すべり軸受９１の内径は、出力軸８１の外径よりも数マイクロ～数十マイクロほど大きくなっている。すべり軸受９１の内面と出力軸８１とのわずかな隙間には、潤滑油が充填されている。 The slide bearing 91 has a cylindrical shape. The outer diameter of the slide bearing 91 is substantially the same as the diameter of the insertion hole 84A. Further, the inner diameter of the slide bearing 91 is several micrometer to several tens of micron larger than the outer diameter of the output shaft 81. Lubricating oil is filled in the slight gap between the inner surface of the slide bearing 91 and the output shaft 81.
　すべり軸受９１の軸線方向の寸法は、出力軸８１の全体の長さの半分程度になっている。この実施形態では、出力軸８１のうちロータヨーク８９の大径部８９Ａに収容されている箇所は、すべり軸受９１で覆われている。すべり軸受９１よりも高さ方向Ｔｄの下側には、ナット９２が配置されている。ナット９２は軸支部８４の挿入穴８４Ａを下側から蓋をしている。出力軸８１の下端は、ナット９２の支持部９２Ａによって下側より支えられている。支持部９２Ａの材質は、耐熱性の樹脂となっている。また、ナット９２は、出力軸８１とすべり軸受９１との間に充填された潤滑油が、すべり軸受９１の高さ方向Ｔｄの下側へと漏れることを抑制している。 The axial dimension of the slide bearing 91 is about half of the total length of the output shaft 81. In this embodiment, a portion of the output shaft 81 housed in the large diameter portion 89A of the rotor yoke 89 is covered with a slide bearing 91. A nut 92 is arranged below the slide bearing 91 in the height direction Td. The nut 92 covers the insertion hole 84A of the shaft support portion 84 from below. The lower end of the output shaft 81 is supported from below by the support portion 92A of the nut 92. The material of the support portion 92A is a heat-resistant resin. Further, the nut 92 suppresses the lubricating oil filled between the output shaft 81 and the slide bearing 91 from leaking to the lower side of the slide bearing 91 in the height direction Td.
　ベース８２の高さ方向Ｔｄの上側の開口縁には、円環状のフランジ９３が被せられている。フランジ９３の内径は、ロータヨーク８９における大径部８９Ａの外径よりもやや大きくなっている。なお、フランジ９３の中央の孔を挿通して、出力軸８１が小径部８９Ｂに覆われた状態でフランジ９３よりも上側にまで突出している。 An annular flange 93 is covered on the upper opening edge of the base 82 in the height direction Td. The inner diameter of the flange 93 is slightly larger than the outer diameter of the large diameter portion 89A of the rotor yoke 89. The output shaft 81 is covered with the small diameter portion 89B through the hole in the center of the flange 93 and protrudes upward from the flange 93.
　図５に示すように、出力軸８１の高さ方向Ｔｄ上側の先端部には、ロータヨーク８９の小径部８９Ｂ及び筒体９４を介して、送風ファン５０が取り付けられている。筒体９４は円筒状の金属部材であり、ロータヨーク８９の小径部８９Ｂの外周面に取り付けられている。図３及び図５に示すように、送風ファン５０は、保持盤５１と、複数の羽根５２と、で構成されている。保持盤５１は、略円盤状になっている。この実施形態では、保持盤５１は、中央ほど上側に盛り上がるような形状になっている。保持盤５１の中央においては、円形の貫通孔５３が開口している。当該貫通孔５３には、上記の筒体９４及び小径部８９Ｂを介して出力軸８１が固定されている。 As shown in FIG. 5, a blower fan 50 is attached to the tip of the output shaft 81 on the upper side of Td in the height direction via the small diameter portion 89B of the rotor yoke 89 and the tubular body 94. The tubular body 94 is a cylindrical metal member, and is attached to the outer peripheral surface of the small diameter portion 89B of the rotor yoke 89. As shown in FIGS. 3 and 5, the blower fan 50 includes a holding plate 51 and a plurality of blades 52. The holding plate 51 has a substantially disk shape. In this embodiment, the holding plate 51 is shaped so as to bulge upward toward the center. At the center of the holding plate 51, a circular through hole 53 is opened. The output shaft 81 is fixed to the through hole 53 via the tubular body 94 and the small diameter portion 89B.
　保持盤５１の上側の面には、複数の羽根５２が上側に向かって突出している。羽根５２は、板状となっている。羽根５２は、保持盤５１の径方向内側から外側に向かって延びている。なお、この実施形態では、延設長さの異なる羽根５２が設けられている。また、羽根５２は、保持盤５１の周方向に等間隔毎に配置されている。したがって、複数の羽根５２は、高さ方向Ｔｄから視た場合に、放射状に配置されている。 A plurality of blades 52 project upward on the upper surface of the holding plate 51. The blade 52 has a plate shape. The blade 52 extends from the radial inside to the outside of the holding plate 51. In this embodiment, blades 52 having different extending lengths are provided. Further, the blades 52 are arranged at equal intervals in the circumferential direction of the holding plate 51. Therefore, the plurality of blades 52 are arranged radially when viewed from the height direction Td.
　図３及び図５に示すように、ファンケース６１のファン部６０内部には、送風ファン５０が収容される収容空間Ｓ１と、送風ファン５０から送風される空気が流通する流通路Ｓ２が区画されている。収容空間Ｓ１は、ファン部６０の内部空間のうちの径方向中央部分で構成されている。具体的には、収容空間Ｓ１は、フランジ９３の上面と、上側ファンケース６２の内面とで上下方向に挟まれた空間である。したがって、収容空間Ｓ１は、導入口６４を介してファンケース６１の外部に直接連通している。流通路Ｓ２は、ファン部６０の内部空間のうちの径方向外側部分で構成されている。具体的には、流通路Ｓ２は、下側ファンケース６３の内面と上側ファンケース６２の内面とで上下方向に挟まれた空間である。したがって、流通路Ｓ２は、収容空間Ｓ１の径方向外側で円環状に延びている。また、流通路Ｓ２は、収容空間Ｓ１に対して径方向に連通している。この実施形態では、流通路Ｓ２は、当該流通路Ｓ２の延設方向に直交する断面視で概ね円形状になっている。 As shown in FIGS. 3 and 5, inside the fan portion 60 of the fan case 61, a storage space S1 in which the blower fan 50 is housed and a flow passage S2 through which the air blown from the blower fan 50 flows are partitioned. ing. The accommodation space S1 is composed of a radial central portion of the internal space of the fan portion 60. Specifically, the accommodation space S1 is a space sandwiched in the vertical direction between the upper surface of the flange 93 and the inner surface of the upper fan case 62. Therefore, the accommodation space S1 directly communicates with the outside of the fan case 61 via the introduction port 64. The flow passage S2 is composed of a radial outer portion of the internal space of the fan portion 60. Specifically, the flow passage S2 is a space sandwiched in the vertical direction between the inner surface of the lower fan case 63 and the inner surface of the upper fan case 62. Therefore, the flow passage S2 extends in an annular shape on the radial outside of the accommodation space S1. Further, the flow passage S2 communicates with the accommodation space S1 in the radial direction. In this embodiment, the flow passage S2 has a substantially circular shape in a cross-sectional view orthogonal to the extending direction of the flow passage S2.
　ここで、コイル８７の巻き中心軸Ｃ方向における永久磁石９０の径方向外側の面とステータアッシー８５の壁部８６Ｃの径方向内側の面と離間距離を隙間Ｇとする。この実施形態では、隙間Ｇは、高さ方向Ｔｄにおける下側に向かうほど広くなっている。そのため、高さ方向Ｔｄにおいて、コイル８７の巻き中心軸Ｃよりも上側における隙間Ｇの平均よりも、コイル８７の巻き中心軸Ｃよりも下側における隙間Ｇの平均の方が広くなっている。すなわち、隙間Ｇにおいて、巻き中心軸Ｃよりも上側の箇所の方が、巻き中心軸Ｃよりも下側の箇所よりも広くなっている。 Here, the distance between the radial outer surface of the permanent magnet 90 in the winding center axis C direction of the coil 87 and the radial inner surface of the wall portion 86C of the stator assembly 85 is defined as the gap G. In this embodiment, the gap G becomes wider toward the lower side in the height direction Td. Therefore, in the height direction Td, the average of the gap G below the winding center axis C of the coil 87 is wider than the average of the gap G above the winding center axis C of the coil 87. That is, in the gap G, the portion above the winding center axis C is wider than the portion below the winding center axis C.
　なお、上述したとおり、高さ方向Ｔｄにおいて出力軸８１の上端に、送風ファン５０が固定されている。したがって、この実施形態では、高さ方向Ｔｄにおいて、上記隙間Ｇが広くなっている側に、送風ファン５０が固定されている。 As described above, the blower fan 50 is fixed to the upper end of the output shaft 81 in the height direction Td. Therefore, in this embodiment, the blower fan 50 is fixed to the side where the gap G is widened in the height direction Td.
　次に、上記実施形態の作用について説明する。 Next, the operation of the above embodiment will be described.
　モータ８０に電力が供給されると、コイル８７と永久磁石９０との間で発生する電磁力により、ロータアッシー８８が回転する。ロータアッシー８８の回転に伴って、出力軸８１及び送風ファン５０が回転する。送風ファン５０が回転すると、ブロア４０の外部の空気が、導入口６４を通ってファンケース６１内部に吸引される。空気は、送風ファン５０の遠心力により、ファンケース６１の流通路Ｓ２に導かれる。空気は、送風ファン５０の回転に合わせて流通路Ｓ２を周方向に流通する。なお、流通路Ｓ２において、送風ファン５０の回転によって空気の流速や圧力が増加する。流通路Ｓ２を通過した空気は、導出管７０及び排出管１００を通過してブロア４０の外部に放出される。 When electric power is supplied to the motor 80, the rotor assembly 88 rotates due to the electromagnetic force generated between the coil 87 and the permanent magnet 90. As the rotor assembly 88 rotates, the output shaft 81 and the blower fan 50 rotate. When the blower fan 50 rotates, the air outside the blower 40 is sucked into the fan case 61 through the introduction port 64. The air is guided to the flow passage S2 of the fan case 61 by the centrifugal force of the blower fan 50. The air circulates in the flow passage S2 in the circumferential direction in accordance with the rotation of the blower fan 50. In the flow passage S2, the flow velocity and pressure of the air increase due to the rotation of the blower fan 50. The air that has passed through the flow passage S2 passes through the outlet pipe 70 and the discharge pipe 100 and is discharged to the outside of the blower 40.
　また、送風ファン５０が回転することにより、ファンケース６１内部には、導入口６４から空気が導入される。ファンケース６１内部に空気が導入されると、ファンケース６１内部のうち、収容空間Ｓ１及び流通路Ｓ２では、送風される空気が相応に速く流れる。一方で、送風ファン５０とモータ８０との間の空間は、収容空間Ｓ１及び流通路Ｓ２と比べて、空気の流れは遅い。そのため、空気の流速の差によって、送風ファン５０とモータ８０との間の空間においては、送風ファン５０の上側の部分である収容空間Ｓ１と比べて圧力が大きくなる。そのため、送風ファン５０には、送風ファン５０の上側の部分と下側の部分との圧力差により、高さ方向Ｔｄの上側に押されるように力が加わる。 Further, as the blower fan 50 rotates, air is introduced into the fan case 61 from the introduction port 64. When air is introduced into the fan case 61, the blown air flows at a correspondingly high speed in the accommodation space S1 and the flow passage S2 in the inside of the fan case 61. On the other hand, in the space between the blower fan 50 and the motor 80, the air flow is slower than that in the accommodation space S1 and the flow passage S2. Therefore, due to the difference in the flow velocity of the air, the pressure in the space between the blower fan 50 and the motor 80 becomes larger than that in the accommodation space S1 which is the upper portion of the blower fan 50. Therefore, a force is applied to the blower fan 50 so as to be pushed upward in the height direction Td due to the pressure difference between the upper portion and the lower portion of the blower fan 50.
　次に、上記実施形態の効果について説明する。 Next, the effects of the above embodiment will be described.
　（１）上記実施形態によれば、永久磁石９０とステータアッシー８５との間の隙間Ｇは、高さ方向Ｔｄにおける下側ほど、高さ方向Ｔｄにおける上側と比べて広くなっている。すなわち、隙間Ｇにおいて、巻き中心軸Ｃよりも上側の箇所の方が、巻き中心軸Ｃよりも下側の箇所よりも広くなっている。そのため、モータ８０に電力が供給されて、コイル８７と永久磁石９０との間で電磁力が発生すると、永久磁石９０とステータアッシー８５とを引き合わせようとする力が発生する。このとき、永久磁石９０には、全体として、コイル８７の巻き中心軸Ｃに向かって引き付けられるような力が作用する。上述のとおり、永久磁石９０とステータアッシー８５との間の隙間Ｇは、高さ方向Ｔｄにおける下側ほど、高さ方向における上側と比べて広くなっている。よって、永久磁石９０のうち、高さ方向Ｔｄにおける上側の部分は、下側の部分と比べて、より強くコイル８７の巻き中心軸Ｃに向かって引っ張られる。その結果、永久磁石９０の上側の部分と下側の部分との、コイル８７に引っ張られる力の差によって、永久磁石９０は、高さ方向Ｔｄにおける上側から下側に向かっても力が作用する。その結果、ロータアッシー８８や送風ファン５０が、高さ方向Ｔｄの上側に位置ずれすることを抑制できる。 (1) According to the above embodiment, the gap G between the permanent magnet 90 and the stator assembly 85 is wider on the lower side in the height direction Td than on the upper side in the height direction Td. That is, in the gap G, the portion above the winding center axis C is wider than the portion below the winding center axis C. Therefore, when electric power is supplied to the motor 80 and an electromagnetic force is generated between the coil 87 and the permanent magnet 90, a force that tries to attract the permanent magnet 90 and the stator assembly 85 is generated. At this time, a force that attracts the permanent magnet 90 toward the winding center axis C of the coil 87 acts as a whole. As described above, the gap G between the permanent magnet 90 and the stator assembly 85 is wider in the lower side in the height direction Td than in the upper side in the height direction. Therefore, the upper portion of the permanent magnet 90 in the height direction Td is pulled more strongly toward the winding center axis C of the coil 87 than the lower portion. As a result, due to the difference in the force pulled by the coil 87 between the upper portion and the lower portion of the permanent magnet 90, the permanent magnet 90 also exerts a force from the upper side to the lower side in the height direction Td. .. As a result, it is possible to prevent the rotor assembly 88 and the blower fan 50 from being displaced above the Td in the height direction.
　（２）上記実施形態によれば、ロータアッシー８８は、ステータアッシー８５よりも径方向内側に配置されている。そのため、ロータアッシー８８がステータアッシー８５よりも径方向外側に配置されている場合と比べて、ロータアッシー８８の径方向の寸法を小さくできる。よって、ロータアッシー８８が高さ方向Ｔｄに引っ張られるような力を受けても、出力軸８１が高さ方向Ｔｄに対してぶれるなどの問題は生じにくい。 (2) According to the above embodiment, the rotor assembly 88 is arranged radially inside the stator assembly 85. Therefore, the radial dimension of the rotor assembly 88 can be reduced as compared with the case where the rotor assembly 88 is arranged radially outside the stator assembly 85. Therefore, even if the rotor assembly 88 receives a force that pulls the rotor assembly 88 in the height direction Td, the problem that the output shaft 81 shakes with respect to the height direction Td is unlikely to occur.
　（３）上記実施形態によれば、挿入穴８４Ａの内周面と出力軸８１の外周面との間にはすべり軸受９１が介在されている。すべり軸受９１は、比較的に出力軸８１の軸線方向において長い範囲で出力軸８１を支持する。したがって、ロータアッシー８８が高さ方向Ｔｄに引っ張られるような力を受けても、出力軸８１が高さ方向Ｔｄに対してぶれるなどの問題は生じにくい。 (3) According to the above embodiment, the slide bearing 91 is interposed between the inner peripheral surface of the insertion hole 84A and the outer peripheral surface of the output shaft 81. The plain bearing 91 supports the output shaft 81 in a relatively long range in the axial direction of the output shaft 81. Therefore, even if the rotor assembly 88 is subjected to a force that is pulled in the height direction Td, problems such as the output shaft 81 being shaken with respect to the height direction Td are unlikely to occur.
　（４）上記実施形態によれば、隙間Ｇを、高さ方向Ｔｄにおいて変化させることを、永久磁石９０の径方向外側の面において、高さ方向Ｔｄの下側の箇所の方を、高さ方向Ｔｄの上側の箇所よりも出力軸８１の近くに位置させることで実現している。特に、本実施形態においては、永久磁石９０の径方向外側の面を高さ方向Ｔｄに対して傾斜させることによって実現している。この構成であれば、永久磁石９０の外形の変更のみで隙間Ｇを変化させることが可能で、他の部材の設計変更等が強いられない。 (4) According to the above embodiment, changing the gap G in the height direction Td means that the height of the portion below the height direction Td on the radial outer surface of the permanent magnet 90 is increased. This is achieved by locating it closer to the output shaft 81 than the location above the direction Td. In particular, in the present embodiment, it is realized by inclining the radial outer surface of the permanent magnet 90 with respect to the height direction Td. With this configuration, the gap G can be changed only by changing the outer shape of the permanent magnet 90, and the design of other members cannot be changed.
　（５）上述したとおり、ファンケース６１の内部において流通路Ｓ２や送風ファン５０の上側の空間においては空気が相応の速度で流通するのに対して、送風ファン５０とモータ８０との間の空間は空気が流通しにくい。そのため、送風ファン５０が、出力軸８１やロータアッシー８８と共に、高さ方向Ｔｄの上側へ向けて浮き上がるように位置ずれするおそれがある。 (5) As described above, in the space above the flow passage S2 and the blower fan 50 inside the fan case 61, air flows at an appropriate speed, whereas the space between the blower fan 50 and the motor 80 It is difficult for air to flow. Therefore, the blower fan 50 may be displaced toward the upper side in the height direction Td together with the output shaft 81 and the rotor assembly 88 so as to be lifted.
　この点、上記実施形態では、永久磁石９０とステータアッシー８５との間の隙間Ｇが、高さ方向Ｔｄの送風ファン５０側ほど狭くなっている。そのため、送風ファン５０が高さ方向Ｔｄの上側へ向けて動こうとする力を、コイル８７の電磁力で相殺できる。したがって、出力軸８１やロータアッシー８８が高さ方向Ｔｄの上側に移動しようとすることを抑制できる。 In this respect, in the above embodiment, the gap G between the permanent magnet 90 and the stator assembly 85 is narrower toward the blower fan 50 side in the height direction Td. Therefore, the force that the blower fan 50 tends to move toward the upper side of Td in the height direction can be offset by the electromagnetic force of the coil 87. Therefore, it is possible to prevent the output shaft 81 and the rotor assembly 88 from moving to the upper side in the height direction Td.
　上記実施形態は、以下のように変更して実施することができる。上記実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。 The above embodiment can be changed and implemented as follows. The above embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
　・上記実施形態において、ＣＰＡＰ装置１０は、ブロア４０とは別の装置を備えていてもよい。例えば、ＣＰＡＰ装置１０は、加湿器を備えていてもよい。加湿器を設ける場合には、例えば、ハウジング２０の排出管１００に加湿器を取り付け、加湿器の排出側にホース１３０を取り付けるのが好適である。 -In the above embodiment, the CPAP device 10 may include a device different from the blower 40. For example, the CPAP device 10 may include a humidifier. When a humidifier is provided, for example, it is preferable to attach the humidifier to the discharge pipe 100 of the housing 20 and attach the hose 130 to the discharge side of the humidifier.
　・上記実施形態において、ブロア４０の形状は、上記実施形態の例に限られない。例えば、ファン部６０のうち、ファンケース６１は、送風ファン５０を収容する収容空間が、高さ方向Ｔｄから視た場合に、概ね円形状であれば、ファンケース６１の外形は直方体状であってもよいし、多角形状であってもよい。また例えば、導出管７０は、内径が広がるように延びていてもよいし、湾曲していてもよい。 -In the above embodiment, the shape of the blower 40 is not limited to the example of the above embodiment. For example, in the fan portion 60, if the accommodation space for accommodating the blower fan 50 is approximately circular when viewed from the height direction Td, the outer shape of the fan case 61 is rectangular parallelepiped. It may be a polygonal shape. Further, for example, the lead-out pipe 70 may be extended or curved so that the inner diameter is widened.
　・ファンケース６１を省略することもできる。この場合、例えば、ハウジング２０がファンケース６１の流通路Ｓ２に相当する空間を区画するような形状になっていればよい。 ・ The fan case 61 can be omitted. In this case, for example, the housing 20 may be shaped so as to partition the space corresponding to the flow passage S2 of the fan case 61.
　・モータ８０の構成は、上記実施形態に限定されない。モータ８０は、出力軸８１、ロータアッシー８８、ステータアッシー８５及びベース８２を備えていれば、その他の部材は含まれていなくてもよいし、上記実施形態以外の構成が含まれていてもよい。また、モータ８０の構成は、いわゆるアウタロータ型であってもよい。すなわち、ロータアッシー８８が、ステータアッシー８５の径方向外側に配置されていてもよい。さらに例えば、すべり軸受９１に代えて、転がり軸受としてもよい。 -The configuration of the motor 80 is not limited to the above embodiment. As long as the motor 80 includes an output shaft 81, a rotor assembly 88, a stator assembly 85, and a base 82, other members may not be included, or configurations other than the above-described embodiment may be included. .. Further, the configuration of the motor 80 may be a so-called outer rotor type. That is, the rotor assembly 88 may be arranged radially outside the stator assembly 85. Further, for example, a rolling bearing may be used instead of the sliding bearing 91.
　・上記実施形態において、ベース８２は、出力軸８１を支持できる形状であればどのような形状でもよい。例えば、ベース８２は、軸支部８４のみを有しており、本体部８３を備えていなくてもよい。 -In the above embodiment, the base 82 may have any shape as long as it can support the output shaft 81. For example, the base 82 has only the shaft support portion 84, and may not include the main body portion 83.
　・上記実施形態において、ステータアッシー８５の壁部８６Ｃが省かれていてもよい。この場合、例えば、コイル８７が、ステータアッシー８５の径方向内側の端となる場合、コイル８７と永久磁石９０との間との距離が、隙間Ｇとなる。 -In the above embodiment, the wall portion 86C of the stator assembly 85 may be omitted. In this case, for example, when the coil 87 is the radial inner end of the stator assembly 85, the distance between the coil 87 and the permanent magnet 90 is the gap G.
　・上記実施形態において、永久磁石９０の着磁箇所は、上記実施形態の例に限られない。例えば、永久磁石９０は、周方向に４５度毎に、径方向外側の極が異なるように着磁されていてもよい。すなわち、永久磁石９０の数は４つでなくてもよい。 -In the above embodiment, the magnetized portion of the permanent magnet 90 is not limited to the example of the above embodiment. For example, the permanent magnet 90 may be magnetized so that the outer poles in the radial direction are different every 45 degrees in the circumferential direction. That is, the number of permanent magnets 90 does not have to be four.
　・上記実施形態において、高さ方向Ｔｄにおいて、永久磁石９０の位置とステータアッシー８５の位置とは、永久磁石９０の全ての範囲で重複していなくてもよい。径方向において、永久磁石９０が、部分的にコイル８７と対向しており、コイル８７の巻き中心軸Ｃ上に永久磁石９０が位置していればよい。この場合であっても、巻き中心軸Ｃを境界として、高さ方向Ｔｄにおける上側の箇所の方が、下側の箇所よりも、隙間Ｇが広くなっていればよい。 -In the above embodiment, the position of the permanent magnet 90 and the position of the stator assembly 85 do not have to overlap in the entire range of the permanent magnet 90 in the height direction Td. It is sufficient that the permanent magnet 90 partially faces the coil 87 in the radial direction and the permanent magnet 90 is located on the winding center axis C of the coil 87. Even in this case, the gap G may be wider in the upper portion in the height direction Td with the winding center axis C as the boundary than in the lower portion.
　・上記実施形態において、コイル８７の巻き中心軸Ｃが、径方向に対して傾斜していてもよい。この場合、例えば、永久磁石９０が円筒状となっており、永久磁石９０の径方向外側の面が高さ方向Ｔｄに対して傾斜していなくても、コイル８７の径方向内側の面が、高さ方向Ｔｄに対して傾斜することで、永久磁石９０とステータアッシー８５との間の隙間Ｇの広がりが実現されていてもよい。 -In the above embodiment, the winding center axis C of the coil 87 may be inclined with respect to the radial direction. In this case, for example, even if the permanent magnet 90 has a cylindrical shape and the radial outer surface of the permanent magnet 90 is not inclined with respect to the height Td, the radial inner surface of the coil 87 is formed. By inclining with respect to Td in the height direction, the expansion of the gap G between the permanent magnet 90 and the stator assembly 85 may be realized.
　・上記実施形態において、永久磁石９０とステータアッシー８５との間の隙間Ｇは、高さ方向Ｔｄの上側から下側に向けて、徐々に広がっていなくてもよい。具体的には、例えば永久磁石９０の径方向外側の面が、階段状となっており、高さ方向Ｔｄの上側から下側に向けて、不連続的に隙間Ｇが広がっていてもよい。この場合であっても、永久磁石９０の径方向外側の面において、高さ方向Ｔｄの下側の箇所の方が、高さ方向Ｔｄの上側の箇所よりも出力軸８１の近くに位置させることが実現できる。 -In the above embodiment, the gap G between the permanent magnet 90 and the stator assembly 85 does not have to gradually widen from the upper side to the lower side in the height direction Td. Specifically, for example, the radial outer surface of the permanent magnet 90 may be stepped, and the gap G may be discontinuously widened from the upper side to the lower side in the height direction Td. Even in this case, on the radial outer surface of the permanent magnet 90, the lower portion of the height direction Td should be located closer to the output shaft 81 than the upper portion of the height direction Td. Can be realized.
　・上記実施形態において、永久磁石９０とステータアッシー８５との間の隙間Ｇは、高さ方向Ｔｄの下側から上側に向けて、広がっていてもよい。図７に示す例では、永久磁石９０が円錐台状となっている。永久磁石９０の径方向外側の面は、高さ方向Ｔｄの下側から上側に向かうほど、径方向外側から内側に位置するように、高さ方向Ｔｄに対して傾斜している。そのため、永久磁石９０とステータアッシー８５との間の隙間Ｇは、高さ方向Ｔｄの上側ほど、高さ方向Ｔｄにおける下側と比べて広くなっている。そのため、永久磁石９０とステータアッシー８５とが引き合う力により、永久磁石９０は、高さ方向Ｔｄの上側にも引っ張られることで、永久磁石９０を含むロータアッシー８８全体が高さ方向Ｔｄの上側に引っ張られる。その結果、ロータアッシー８８に固定されている送風ファン５０も高さ方向Ｔｄの上側に引っ張られる。したがって、送風ファン５０や出力軸８１が高さ方向Ｔｄの下側に位置ずれすることを抑制できる。特に、この変更例の場合は、出力軸８１とナット９２の支持部９２Ａが強く干渉することを防げるので、支持部９２Ａの摩耗を抑制できる。 -In the above embodiment, the gap G between the permanent magnet 90 and the stator assembly 85 may widen from the lower side to the upper side of the Td in the height direction. In the example shown in FIG. 7, the permanent magnet 90 has a truncated cone shape. The radial outer surface of the permanent magnet 90 is inclined with respect to the height Td so as to be located from the radial outer side to the inner side from the lower side to the upper side of the height direction Td. Therefore, the gap G between the permanent magnet 90 and the stator assembly 85 is wider toward the upper side in the height direction Td than from the lower side in the height direction Td. Therefore, the permanent magnet 90 is pulled to the upper side of the height direction Td by the attractive force between the permanent magnet 90 and the stator assembly 85, so that the entire rotor assembly 88 including the permanent magnet 90 is moved to the upper side of the height direction Td. Be pulled. As a result, the blower fan 50 fixed to the rotor assembly 88 is also pulled upward in the height direction Td. Therefore, it is possible to prevent the blower fan 50 and the output shaft 81 from being displaced below the Td in the height direction. In particular, in the case of this modification, it is possible to prevent the output shaft 81 and the support portion 92A of the nut 92 from strongly interfering with each other, so that wear of the support portion 92A can be suppressed.
　・図５に示す断面視において、コイル８７の巻き中心軸Ｃの位置を、出力軸８１の長さ方向（高さ方向Ｔｄ）における基準高さと呼称することがある。出力軸８１の長さ方向（高さ方向Ｔｄ）において、当該基準高さよりも出力軸８１の先端に近い任意の位置（図５において上側）を、第１の高さ位置と呼称することがある。出力軸８１の長さ方向（高さ方向Ｔｄ）において、当該基準位置または基準高さよりも出力軸８１の基端に近い任意の位置（図５において下側）を、第２の高さ位置と呼称することがある。永久磁石９０の径方向外向き面とステータアッシー８５の径方向内向き面とは、出力軸８１の長さ方向（高さ方向Ｔｄ）における基準高さ位置において径方向基準距離だけ離間してよく、第１の高さ位置において、前記径方向基準距離より小さい第１の径方向距離だけ離間してよく、第２の高さ位置において、前記径方向基準距離より大きい第２の径方向距離だけ離間してよい。 In the cross-sectional view shown in FIG. 5, the position of the winding center axis C of the coil 87 may be referred to as a reference height in the length direction (height direction Td) of the output shaft 81. In the length direction (height direction Td) of the output shaft 81, an arbitrary position (upper side in FIG. 5) closer to the tip of the output shaft 81 than the reference height may be referred to as a first height position. .. In the length direction (height direction Td) of the output shaft 81, an arbitrary position (lower side in FIG. 5) closer to the base end of the output shaft 81 than the reference position or the reference height is referred to as a second height position. Sometimes called. The radial outward surface of the permanent magnet 90 and the radial inward surface of the stator assembly 85 may be separated by a radial reference distance at a reference height position in the length direction (height direction Td) of the output shaft 81. , At the first height position, they may be separated by a first radial distance smaller than the radial reference distance, and at the second height position, only a second radial distance larger than the radial reference distance. May be separated.
　１０…ＣＰＡＰ装置
　２０…ハウジング
　５０…送風ファン
　８０…モータ
　８１…出力軸
　８２…ベース
　８４Ａ…挿入穴
　８５…ステータアッシー
　８７…コイル
　８８…ロータアッシー
　９０…永久磁石
　９１…すべり軸受
　Ｃ…巻き中心軸
　Ｇ…隙間 10 ... CPAP device 20 ... Housing 50 ... Blower fan 80 ... Motor 81 ... Output shaft 82 ... Base 84A ... Insertion hole 85 ... Stator assembly 87 ... Coil 88 ... Rotor assembly 90 ... Permanent magnet 91 ... Slide bearing C ... Winding center shaft G …gap

Claims (5)

  1. 　ハウジングと、前記ハウジング内に収容されたモータと、前記モータによって回転される送風ファンとを備え、
    　前記モータは、
    　周方向に並べられている複数のコイルを含むステータアッシーと、
    　前記周方向に並べられている複数の永久磁石を含むロータアッシーと、
    　前記ロータアッシーに固定され、前記ロータアッシーと共に回転する出力軸と、
    　前記出力軸の一部が挿入される挿入穴を有し、前記出力軸を支持するベースと、
    　を有しており、
    　前記永久磁石は、前記出力軸の軸線方向に直交する径方向において少なくとも部分的に前記コイルと対向しているとともに、前記コイルの巻き中心軸上に位置しており、
    　前記径方向における前記永久磁石と前記ステータアッシーとの隙間において、前記巻き中心軸よりも前記軸線方向の一方側の箇所の方が、前記巻き中心軸よりも前記軸線方向の他方側の箇所よりも、広くなっている
    　ＣＰＡＰ装置。     A housing, a motor housed in the housing, and a blower fan rotated by the motor are provided.
    The motor is
    A stator assembly containing multiple coils arranged in the circumferential direction,
    A rotor assembly containing a plurality of permanent magnets arranged in the circumferential direction, and
    An output shaft fixed to the rotor assembly and rotating with the rotor assembly,
    A base having an insertion hole into which a part of the output shaft is inserted and supporting the output shaft,
    Have and
    The permanent magnet is at least partially opposed to the coil in the radial direction orthogonal to the axial direction of the output shaft, and is located on the winding center axis of the coil.
    In the gap between the permanent magnet and the stator assembly in the radial direction, one portion of the winding center axis in the axial direction is larger than the other portion of the winding center axis in the axial direction. , A widespread CPAP device.
  2. 　前記ロータアッシーは、前記ステータアッシーよりも径方向内側に配置されている
    　請求項１に記載のＣＰＡＰ装置。     The CPAP device according to claim 1, wherein the rotor assembly is arranged radially inside the stator assembly.
  3. 　前記挿入穴の内周面と前記出力軸の外周面との間にはすべり軸受が介在されている
    　請求項１又は請求項２に記載のＣＰＡＰ装置。     The CPAP device according to claim 1 or 2, wherein a slide bearing is interposed between the inner peripheral surface of the insertion hole and the outer peripheral surface of the output shaft.
  4. 　前記コイルの巻き中心軸は、前記軸線方向と直交しており、
    　前記永久磁石の外面のうち前記ステータアッシーに対向している面において、前記巻き中心軸よりも前記軸線方向の一方側の箇所は、前記巻き中心軸よりも前記軸線方向の他方側の箇所よりも、前記出力軸の近くに位置している
    　請求項１～請求項３のいずれか１項に記載のＣＰＡＰ装置。     The winding center axis of the coil is orthogonal to the axis direction and is orthogonal to the axis direction.
    On the outer surface of the permanent magnet facing the stator assembly, one side of the winding center axis in the axial direction is larger than the other side of the winding center axis in the axial direction. The CPAP device according to any one of claims 1 to 3, which is located near the output shaft.
  5. 　前記送風ファンは、前記出力軸における前記軸線方向の他方側の端部に固定されている
    　請求項１～請求項４のいずれか１項に記載のＣＰＡＰ装置。     The CPAP device according to any one of claims 1 to 4, wherein the blower fan is fixed to the other end of the output shaft in the axial direction.
PCT/JP2021/017896 2020-05-13 2021-05-11 Cpap device WO2021230239A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020084564 2020-05-13
JP2020-084564 2020-05-13

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Application Number Title Priority Date Filing Date
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001069738A (en) * 1999-08-31 2001-03-16 Fujitsu Ten Ltd External circumference opposing type motor
JP2014512479A (en) * 2011-04-18 2014-05-22 レスメド・モーター・テクノロジーズ・インコーポレーテッド PAP system blower
JP2015092810A (en) * 2013-09-30 2015-05-14 ミネベア株式会社 Brushless motor and blower using motor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001069738A (en) * 1999-08-31 2001-03-16 Fujitsu Ten Ltd External circumference opposing type motor
JP2014512479A (en) * 2011-04-18 2014-05-22 レスメド・モーター・テクノロジーズ・インコーポレーテッド PAP system blower
JP2015092810A (en) * 2013-09-30 2015-05-14 ミネベア株式会社 Brushless motor and blower using motor

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