US20180223874A1 - Motor and blower - Google Patents

Motor and blower Download PDF

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Publication number
US20180223874A1
US20180223874A1 US15/863,173 US201815863173A US2018223874A1 US 20180223874 A1 US20180223874 A1 US 20180223874A1 US 201815863173 A US201815863173 A US 201815863173A US 2018223874 A1 US2018223874 A1 US 2018223874A1
Authority
US
United States
Prior art keywords
motor
housing
stator core
bearing
motor housing
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US15/863,173
Other languages
English (en)
Inventor
Yohei MARUYAMA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shinano Kenshi Co Ltd
Original Assignee
Shinano Kenshi Co Ltd
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 Shinano Kenshi Co Ltd filed Critical Shinano Kenshi Co Ltd
Assigned to SHINANO KENSHI KABUSHIKI KAISHA reassignment SHINANO KENSHI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARUYAMA, Yohei
Publication of US20180223874A1 publication Critical patent/US20180223874A1/en
Priority to US17/380,300 priority Critical patent/US11699937B2/en
Abandoned legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/059—Roller bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • 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
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/053—Shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps

Definitions

  • the present invention relates to a motor used for continuous positive airway press (CPAP), for example, and a blower including the motor.
  • CPAP continuous positive airway press
  • a rotor As components constituting the motor, there are a rotor, a stator, a bearing, a motor housing, and the like.
  • a stator As components constituting the motor, there are a rotor, a stator, a bearing, a motor housing, and the like.
  • an outer diameter portion of a stator core of the stator is fixed to the motor housing.
  • the rotor is rotatably supported to the motor housing via a bearing component.
  • both vibration caused by a magnetic attraction force of the stator and the rotor and vibration related to the rotor and the bearing are transmitted to the motor housing.
  • the vibration transmitted to the motor housing increases as a rotational speed of the motor increases.
  • the assembled motor is subjected to vibration-proof measures such as wrapping or hanging with elastic components or the like and then is assembled into a product.
  • vibration-proof measures such as wrapping or hanging with elastic components or the like
  • a tubular cap made of an elastic body is mounted on an outer peripheral portion of a ball bearing fitted in the ball housing provided with a through hole.
  • a protrusion corresponding to the through hole is provided on an inner peripheral surface of the cap.
  • the motor described above is provided with vibration-proof measures, when the motor is wrapped with an elastic component, the outer diameter of the motor and the blower for assembling the motor becomes large, and if the motor is hung with an elastic component, the product shape becomes large since a space for vibration-proof is required.
  • the present invention has been made to solve these problems and an object thereof is to provide a motor of which vibration is unlikely to be transmitted to a motor housing and a blower which is provided with the motor and realizes the noise reduction by providing a vibration-proof structure between a stator, a rotor, and a bearing in the motor housing.
  • the present invention has the following configurations.
  • a motor including: a motor housing; a stator that has a stator core integrally assembled in the motor housing; a bearing housing that is concentrically disposed in a center hole of the stator core, is integrally assembled with the stator core, and has a tubular shape; and a rotor in which a rotor shaft is rotatably supported via a bearing inserted into the bearing housing, in which the stator core is integrally assembled to the motor housing with an elastic member interposed therebetween in a radial direction, in which the bearing housings are integrally assembled from both ends of the stator core in an axial direction with respect to a center hole surrounded by pole teeth protruding inward of the stator core in the radial direction.
  • stator core, the bearing, and the bearing housing are integrally fixed and the elastic member is interposed between the stator core and the motor housing and installed, by providing vibration-proof structure with respect to the stator assembled in the motor housing and the rotor rotatably supported by the stator, vibration of the motor is unlikely to be transmitted to the motor housing.
  • the bearing housing is integrally assembled from both ends of the stator core with respect to the center hole surrounded by the pole teeth protruding inward of the stator core in the radial direction. Accordingly, since the bearing housing is integrally assembled with the stator core instead of the motor housing, vibration is unlikely to be transmitted directly from the bearing to the motor housing.
  • the bearing housing and the bearing may be assembled to each other with the elastic member interposed therebetween in the axial direction.
  • pre-load can be applied to the bearings rotating at high speed to lengthen the service life thereof.
  • the elastic member although there are a wave washer, a leaf spring, a disc spring, a coil spring and the like, in the elastic member for CPAP using a small ball bearing at high-speed rotation, it is more preferable that the coil spring is compressed to be shorter than a natural length thereof and interposed because it gives less variation in the pre-load than that the wave washer gives and therefore load can be stably applied in the axial direction.
  • a blower including: a blowing path that is formed by integrally assembling the motor housing of the motor described above and a blower housing; and an impeller that is integrally assembled with the rotor shaft extending through the blower housing, in which vibration of the motor housing is less likely to be transmitted to the blower housing, and therefore noise reduction can be realized.
  • FIG. 1 is a sectional view of a motor.
  • FIG. 2 is a sectional view of a blower.
  • a motor and a blower according to the invention will be described with reference to the attached drawings.
  • a schematic configuration of a motor will be described with reference to FIG. 1 .
  • the motor a DC brushless motor is used, and in this example, an inner rotor type motor is used.
  • a motor housing 1 is integrally assembled by combining a first motor housing 1 a and a second motor housing 1 b and screwing a bolt (not illustrated) into threaded holes 1 c , 1 d communicating with each other.
  • a bolt not illustrated
  • As the motor housing 1 stainless steel (SUS), aluminum material, or the like is used.
  • the stator 2 is assembled in the motor housing 1 .
  • the stator 2 includes a stator core 2 a , an insulator 2 b which covers both end surfaces of the stator core 2 a , and a coil 2 c which has a magnet wire wound around pole teeth 2 e via the insulator 2 b .
  • a stator core 2 a a laminated core is used in which a plurality of electromagnetic steel plates are laminated and caulked.
  • a plurality of pole teeth 2 e are formed inward from an annular core back portion 2 d in the radial direction.
  • the stator core 2 a is integrally fixed to an inner wall surface of the second motor housing 1 b with the elastic member 3 interposed between an outer peripheral surface of the core back portion 2 d and the stator core.
  • the elastic member 3 a rubber sheet, an elastomeric resin or the like is used.
  • a pair of bearing housings 4 a , 4 b formed in a tubular shape are fixed by press-fitting or adhesion from both end surfaces in the center hole 2 f surrounded by the pole teeth 2 e protruding inward of the stator core 2 a in the radial direction. Since a non-magnetic metal material (for example, aluminum, non-magnetic stainless steel, or the like) is used for the bearing housings 4 a , 4 b and the bearing housings 4 a , 4 b is press-fitted to a magnetic flux acting surface of each pole tooth 2 e , the press-fitting amount thereof is adjusted to the minimum necessary.
  • a non-magnetic metal material for example, aluminum, non-magnetic stainless steel, or the like
  • Bearings 5 a , 5 b (ball bearings) are inserted into the cylindrical holes of the bearing housings 4 a , 4 b , respectively, and the inner and outer rings are adhered and fixed.
  • a rotor shaft 7 is rotatably supported via the bearings 5 a , 5 b inserted in the bearing housings 4 a , 4 b .
  • a wave washer 8 a (elastic member) is interposed between the bearing housing 4 a and the bearing 5 a . Accordingly, a pre-load can be applied to the bearings 5 a , 5 b rotating at a high speed to lengthen the service life thereof.
  • the wave washer 8 a although a leaf spring, a disc spring or the like may be used, in a case of CPAP using a small ball bearing at high-speed rotation, it is more preferable that the coil spring 8 b (see FIG. 2 ) is compressed to be shorter than a natural length thereof and interposed therebetween because it gives less variation in the pre-load than that the wave washer 8 a gives and therefore load can be stably applied in the axial direction.
  • a rotor magnet 9 is concentrically assembled to the rotor shaft 7 .
  • the rotor shaft 7 is inserted into the bearings 5 a , 5 b assembled to the bearing housings 4 a , 4 b , and the rotor magnet 9 is disposed facing the pole teeth 2 e of the stator core 2 a and assembled.
  • Spacers 10 a , 10 b are provided between the rotor magnet 9 and the bearings 5 a , 5 b.
  • one end of the rotor shaft 7 extends to the outside from the first motor housing 1 a and serves as an output side.
  • a sensor magnet 11 and a balancer 12 are integrally assembled to the other end of the rotor shaft 7 on the side of the second motor housing 1 b .
  • the sensor magnet 11 detects a rotor magnetic pole position and is magnetized in the same phase as the rotor magnet 9 in the peripheral direction.
  • the balancer 12 is used as a back yoke of the sensor magnet 11 or as a counterbalance correcting material of an impeller described below.
  • a motor substrate 13 provided with a motor drive circuit is supported on the insulator 2 b .
  • a lead wire drawn from the coil 2 c is connected to the motor substrate 13 .
  • a magnetic pole detection sensor 14 (Hall IC or the like) is provided on the surface of the motor substrate 13 facing the sensor magnet 11 .
  • stator core 2 a is integrally assembled to an inner wall surface of the second motor housing 1 b via the elastic member 3 in the radial direction
  • the rotor shaft 7 is integrally assembled in the bearing housing 4 a via the bearing 5 a
  • the rotor 6 is rotatably supported between the bearing 5 a and the bearing housing 4 a via the wave washer 8 a (elastic member) in the axial direction.
  • stator core 2 a since the stator core 2 a , the bearing 5 a , and the bearing housing 4 a are integrally fixed and the elastic member 3 is interposed between the stator core 2 a and the second motor housing 1 b and assembled, by providing the vibration-proof structure with respect to the stator 2 assembled in the motor housing 1 and the rotor 6 rotatably supported by the stator 2 , vibration of the motor can be unlikely to be transmitted to the motor housing 1 .
  • FIG. 2 illustrates a configuration example of a blower 15 provided with a motor M similar to FIG. 1 . Since the internal structure of the motor M is the same as that illustrated in FIG. 1 , different configurations will be mainly described.
  • the blower 15 is supposed to be a blower for CPAP.
  • a motor M is accommodated in the motor housing 16 (first motor housing 16 a and second motor housing 16 b ).
  • an impeller 18 is accommodated in a blower chamber 20 surrounded by the first motor housing 16 a and the blower housing 17 .
  • Curved recessed grooves are respectively formed on the outer peripheral side of the blower housing 17 and the motor housing 16 (first motor housing 16 a and second motor housing 16 b ) and an annular air blowing path 19 is formed by combining the recessed grooves.
  • a suction port 17 a for adsorbing the fluid in the axial direction is formed in a central portion of the blower housing 17 and the fluid is pressurized in the circumferential direction by the impeller 18 so as to circulate around the air blowing path 19 and is discharged.
  • the stator core 2 a has an elastic member 3 interposed between the outer peripheral surface of the core back portion 2 d and the inner wall surface of the second motor housing 16 b so that the stator core 2 a is interposed between the end surfaces of the second motor housing 16 b and the first motor housing 16 a which faces each other and fixed integrally. Accordingly, the vibration between the stator 2 and the rotor 6 can be unlikely to be transmitted to the motor housing 16 .
  • a coil spring 8 b (elastic member) is interposed between the bearing housing 4 a and the bearing 5 a in a state of being compressed to be shorter than a natural length thereof. Accordingly, it is possible to extend the service life thereof by applying a stable pre-load to the bearings 5 a , 5 b rotating at a high speed (because variation in applied pre-load is small).
  • the vibration-proof structure with respect to the stator 2 assembled in the motor housing 16 and the rotor 6 rotatably supported by the stator 2 , the vibration of the motor M can be unlikely to be transmitted to the motor housing 16 .
  • the impeller 18 is assembled to one end of the rotor shaft 7 which extends outward from the first motor housing 16 a and enters the blower chamber 20 side.
  • the sensor magnet 11 and the balancer 12 are integrally assembled to the other end of the rotor shaft 7 in the second motor housing 16 b .
  • the balancer 12 is the back yoke of the sensor magnet 11 and functions as a counterweight of the impeller 18 .
  • the impeller 18 of the blower 15 When the motor M is started, the impeller 18 of the blower 15 is rotated, and the fluid adsorbed from the suction port 17 a into the blower housing 17 in the axial direction by the rotation of the impeller 18 circulates the air blowing path 19 , is pressurized, and compressed air is delivered from the discharge port (not illustrated).
  • stator core can be integrally assembled with the elastic member interposed between the stator core and the outer wall surface of the motor housing (bearing housing) in a radial direction
  • outer rotor type motors can also be applied.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US15/863,173 2017-02-03 2018-01-05 Motor and blower Abandoned US20180223874A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/380,300 US11699937B2 (en) 2017-02-03 2021-07-20 Blower

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-018694 2017-02-03
JP2017018694A JP6783679B2 (ja) 2017-02-03 2017-02-03 モータ及びブロワ

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US17/380,300 Continuation-In-Part US11699937B2 (en) 2017-02-03 2021-07-20 Blower

Publications (1)

Publication Number Publication Date
US20180223874A1 true US20180223874A1 (en) 2018-08-09

Family

ID=63039167

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/863,173 Abandoned US20180223874A1 (en) 2017-02-03 2018-01-05 Motor and blower

Country Status (3)

Country Link
US (1) US20180223874A1 (ja)
JP (1) JP6783679B2 (ja)
CN (1) CN108390499B (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190254746A1 (en) * 2018-02-20 2019-08-22 The Spectranetics Corporation Optical assembly for laser generator
US11306736B2 (en) * 2020-02-18 2022-04-19 Shinano Kenshi Kabushiki Kaisha Blower

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112640266A (zh) * 2018-09-03 2021-04-09 日本电产新宝株式会社 驱动装置

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US20070290570A1 (en) * 2006-05-30 2007-12-20 Nidec Shibaura Corporation Motor
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US20140197705A1 (en) * 2013-01-17 2014-07-17 Mitsubishi Electric Corporation Rotary electric machine
US20190260262A1 (en) * 2016-11-03 2019-08-22 New Motech Co., Ltd. Blower motor

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US20040200215A1 (en) * 2001-10-16 2004-10-14 Woollenweber William E. Bearing system for high-speed rotating machinery
US20070290570A1 (en) * 2006-05-30 2007-12-20 Nidec Shibaura Corporation Motor
US20100059056A1 (en) * 2006-10-24 2010-03-11 RedMed Motor Technologies Inc. Brushless dc motor with bearings
US20140001925A1 (en) * 2012-06-28 2014-01-02 Yang-Fung Fan Motor assembly
US20140197705A1 (en) * 2013-01-17 2014-07-17 Mitsubishi Electric Corporation Rotary electric machine
US20190260262A1 (en) * 2016-11-03 2019-08-22 New Motech Co., Ltd. Blower motor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190254746A1 (en) * 2018-02-20 2019-08-22 The Spectranetics Corporation Optical assembly for laser generator
US10864042B2 (en) * 2018-02-20 2020-12-15 Koninklijke Philips N.V. Optical assembly for laser generator
US11306736B2 (en) * 2020-02-18 2022-04-19 Shinano Kenshi Kabushiki Kaisha Blower
GB2592747B (en) * 2020-02-18 2023-06-14 Shinano Kenshi Co Blower

Also Published As

Publication number Publication date
JP2018126034A (ja) 2018-08-09
CN108390499B (zh) 2022-04-15
JP6783679B2 (ja) 2020-11-11
CN108390499A (zh) 2018-08-10

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