US20180223874A1 - Motor and blower - Google Patents
Motor and blower Download PDFInfo
- 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
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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.
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- 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)
Abstract
Description
- This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2017-018694, filed on Feb. 3, 2017, and the entire contents of which are incorporated herein by reference.
- The present invention relates to a motor used for continuous positive airway press (CPAP), for example, and a blower including the motor.
- As components constituting the motor, there are a rotor, a stator, a bearing, a motor housing, and the like. For example, in an inner rotor type motor, an outer diameter portion of a stator core of the stator is fixed to the motor housing. In addition, the rotor is rotatably supported to the motor housing via a bearing component.
- In such a motor structure, 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. In addition, the vibration transmitted to the motor housing increases as a rotational speed of the motor increases.
- As a countermeasure to this problem, 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. For example, in order to suppress a creep phenomenon of the bearing supporting the rotor, 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. A technique of suppressing the rotation of an outer ring by fitting the protrusion into the through hole at the outer peripheral portion of the ball housing to mount the cap such that the protrusion presses the outer ring of the ball bearing is proposed (see PTL 1: JP-A-2003-250245).
- If 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.
- In addition, in
PTL 1, since a cap made of an elastic body is mounted on the outer peripheral portion of the ball housing, although the vibration between the rotor and the bearing is attenuated to some extent, the driving between the stator and the rotor is transmitted to the motor housing (bracket) and thus is likely to be noisy. - 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.
- In order to achieve the above object, the present invention has the following configurations.
- There is provided 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.
- According to the above configuration, since the 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.
- It is preferable that 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.
- Accordingly, pre-load can be applied to the bearings rotating at high speed to lengthen the service life thereof.
- As 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.
- There is provided 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.
- By providing the vibration-proof structure with respect to the stator assembled in the motor housing and the rotor rotatably supported by the stator, it is possible to provide a motor in which the vibration of the motor is less likely to be transmitted to the motor housing.
- In addition, since the motor housing is unlikely to be vibrated, it is difficult for the vibration to be transmitted to the blower housing so that it is possible to provide a blower that realizes noise reduction.
-
FIG. 1 is a sectional view of a motor. -
FIG. 2 is a sectional view of a blower. - Hereinafter, one embodiment of a motor and a blower according to the invention will be described with reference to the attached drawings. First, a schematic configuration of a motor will be described with reference to
FIG. 1 . As the motor, a DC brushless motor is used, and in this example, an inner rotor type motor is used. - As illustrated in
FIG. 1 , amotor housing 1 is integrally assembled by combining a first motor housing 1 a and asecond motor housing 1 b and screwing a bolt (not illustrated) into threadedholes motor housing 1, stainless steel (SUS), aluminum material, or the like is used. - The
stator 2 is assembled in themotor housing 1. Thestator 2 includes astator core 2 a, aninsulator 2 b which covers both end surfaces of thestator core 2 a, and a coil 2 c which has a magnet wire wound aroundpole teeth 2 e via theinsulator 2 b. As thestator core 2 a, a laminated core is used in which a plurality of electromagnetic steel plates are laminated and caulked. In thestator core 2 a, a plurality ofpole teeth 2 e are formed inward from an annularcore back portion 2 d in the radial direction. Thestator core 2 a is integrally fixed to an inner wall surface of thesecond motor housing 1 b with theelastic member 3 interposed between an outer peripheral surface of thecore back portion 2 d and the stator core. As theelastic member 3, a rubber sheet, an elastomeric resin or the like is used. - This makes it difficult for the vibration between the
stator 2 and therotor 6 to be transmitted to themotor housing 1. - In addition, a pair of bearing
housings center hole 2 f surrounded by thepole teeth 2 e protruding inward of thestator 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 bearinghousings housings pole tooth 2 e, the press-fitting amount thereof is adjusted to the minimum necessary. If the press-fitting amount of thebearing housings stator core 2 a increases and thus the magnetic flux generated on the magnetic flux acting surface of thepole teeth 2 e is disturbed, eddy currents are generated and the motor performance may be deteriorated.Bearings bearing housings - In the
rotor 6, arotor shaft 7 is rotatably supported via thebearings bearing housings wave washer 8 a (elastic member) is interposed between thebearing housing 4 a and the bearing 5 a. Accordingly, a pre-load can be applied to thebearings 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 thewave washer 8 a gives and therefore load can be stably applied in the axial direction. - A
rotor magnet 9 is concentrically assembled to therotor shaft 7. Therotor shaft 7 is inserted into thebearings bearing housings rotor magnet 9 is disposed facing thepole teeth 2 e of thestator core 2 a and assembled.Spacers rotor magnet 9 and thebearings - In addition, one end of the
rotor shaft 7 extends to the outside from the first motor housing 1 a and serves as an output side. In addition, asensor magnet 11 and abalancer 12 are integrally assembled to the other end of therotor shaft 7 on the side of thesecond motor housing 1 b. Thesensor magnet 11 detects a rotor magnetic pole position and is magnetized in the same phase as therotor magnet 9 in the peripheral direction. Thebalancer 12 is used as a back yoke of thesensor 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 theinsulator 2 b. A lead wire drawn from the coil 2 c is connected to themotor substrate 13. In addition, a magnetic pole detection sensor 14 (Hall IC or the like) is provided on the surface of themotor substrate 13 facing thesensor magnet 11. By detecting the magnetic pole position of thesensor magnet 11 with the magneticpole detection sensor 14, the rotational position of therotor magnet 9 is detected and the direction of current flow to the coil 2 c is switched. - As described above, the
stator core 2 a is integrally assembled to an inner wall surface of thesecond motor housing 1 b via theelastic member 3 in the radial direction, therotor shaft 7 is integrally assembled in the bearinghousing 4 a via thebearing 5 a, and therotor 6 is rotatably supported between the bearing 5 a and the bearinghousing 4 a via thewave washer 8 a (elastic member) in the axial direction. - According to the above configuration, since the
stator core 2 a, thebearing 5 a, and the bearinghousing 4 a are integrally fixed and theelastic member 3 is interposed between thestator core 2 a and thesecond motor housing 1 b and assembled, by providing the vibration-proof structure with respect to thestator 2 assembled in themotor housing 1 and therotor 6 rotatably supported by thestator 2, vibration of the motor can be unlikely to be transmitted to themotor housing 1. -
FIG. 2 illustrates a configuration example of ablower 15 provided with a motor M similar toFIG. 1 . Since the internal structure of the motor M is the same as that illustrated inFIG. 1 , different configurations will be mainly described. Theblower 15 is supposed to be a blower for CPAP. - A motor M is accommodated in the motor housing 16 (
first motor housing 16 a andsecond motor housing 16 b). Alternatively, animpeller 18 is accommodated in ablower chamber 20 surrounded by thefirst motor housing 16 a and theblower housing 17. Curved recessed grooves are respectively formed on the outer peripheral side of theblower housing 17 and the motor housing 16 (first motor housing 16 a andsecond motor housing 16 b) and an annularair blowing path 19 is formed by combining the recessed grooves. Asuction port 17 a for adsorbing the fluid in the axial direction is formed in a central portion of theblower housing 17 and the fluid is pressurized in the circumferential direction by theimpeller 18 so as to circulate around theair blowing path 19 and is discharged. - The
stator core 2 a has anelastic member 3 interposed between the outer peripheral surface of the core backportion 2 d and the inner wall surface of thesecond motor housing 16 b so that thestator core 2 a is interposed between the end surfaces of thesecond motor housing 16 b and thefirst motor housing 16 a which faces each other and fixed integrally. Accordingly, the vibration between thestator 2 and therotor 6 can be unlikely to be transmitted to themotor housing 16. - In addition, a coil spring 8 b (elastic member) is interposed between the bearing
housing 4 a and thebearing 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 thebearings - Therefore, by providing the vibration-proof structure with respect to the
stator 2 assembled in themotor housing 16 and therotor 6 rotatably supported by thestator 2, the vibration of the motor M can be unlikely to be transmitted to themotor housing 16. - The
impeller 18 is assembled to one end of therotor shaft 7 which extends outward from thefirst motor housing 16 a and enters theblower chamber 20 side. In addition, thesensor magnet 11 and thebalancer 12 are integrally assembled to the other end of therotor shaft 7 in thesecond motor housing 16 b. Thebalancer 12 is the back yoke of thesensor magnet 11 and functions as a counterweight of theimpeller 18. - When the motor M is started, the
impeller 18 of theblower 15 is rotated, and the fluid adsorbed from thesuction port 17 a into theblower housing 17 in the axial direction by the rotation of theimpeller 18 circulates theair blowing path 19, is pressurized, and compressed air is delivered from the discharge port (not illustrated). - According to the configuration described above, since the vibration of the
motor housing 16 can be reduced, vibration is unlikely to be transmitted to theblower housing 17 and noise reduction can be realized. - Although the example has been described using the inner rotor type motor, if the 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.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US17/380,300 US11699937B2 (en) | 2017-02-03 | 2021-07-20 | Blower |
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JP2017-018694 | 2017-02-03 | ||
JP2017018694A JP6783679B2 (en) | 2017-02-03 | 2017-02-03 | Motor and blower |
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US17/380,300 Continuation-In-Part US11699937B2 (en) | 2017-02-03 | 2021-07-20 | Blower |
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US20180223874A1 true US20180223874A1 (en) | 2018-08-09 |
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Family Applications (1)
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US15/863,173 Abandoned US20180223874A1 (en) | 2017-02-03 | 2018-01-05 | Motor and blower |
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US (1) | US20180223874A1 (en) |
JP (1) | JP6783679B2 (en) |
CN (1) | CN108390499B (en) |
Cited By (2)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPWO2020050242A1 (en) * | 2018-09-03 | 2021-08-30 | 日本電産シンポ株式会社 | Drive device |
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Also Published As
Publication number | Publication date |
---|---|
JP6783679B2 (en) | 2020-11-11 |
JP2018126034A (en) | 2018-08-09 |
CN108390499A (en) | 2018-08-10 |
CN108390499B (en) | 2022-04-15 |
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