CN112383170A - Outer rotor permanent magnet motor and fan using same - Google Patents

Outer rotor permanent magnet motor and fan using same Download PDF

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Publication number
CN112383170A
CN112383170A CN202010836694.8A CN202010836694A CN112383170A CN 112383170 A CN112383170 A CN 112383170A CN 202010836694 A CN202010836694 A CN 202010836694A CN 112383170 A CN112383170 A CN 112383170A
Authority
CN
China
Prior art keywords
end cover
permanent magnet
fixed shaft
magnet motor
outer rotor
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.)
Pending
Application number
CN202010836694.8A
Other languages
Chinese (zh)
Inventor
理查德·汉姆
招国梅
Original Assignee
招国梅
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 招国梅 filed Critical 招国梅
Priority to CN202010836694.8A priority Critical patent/CN112383170A/en
Publication of CN112383170A publication Critical patent/CN112383170A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00Pumping installations or systems
    • F04D25/02Units comprising pumps and their driving means
    • F04D25/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • F04D25/062Details of the bearings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K11/00Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30Structural association with control circuits or drive circuits
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K5/00Casings; Enclosures; Supports
    • H02K5/04Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124Sealing of shafts
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Abstract

The invention provides an outer rotor permanent magnet motor and a fan applying the same, which solve the problem of low structural stability of an outer rotor motor in the prior art. The fan installation stability is higher, and can set for the installation angle of fan support as required, and operating stability is higher.

Description

Outer rotor permanent magnet motor and fan using same
Technical Field
The invention belongs to the technical field of motors, and relates to an outer rotor permanent magnet motor and a fan applying the same.
Background
Large fans are often used in places such as factories, workshops, stations, airports and the like to ventilate and dissipate heat; the existing large fan adopts a shaft output type motor, and the motor needs to be installed and fixed through a support structure firstly, so that the size of the fan is increased, the gravity is heavier, the load of the installation structure of the whole fan is higher, the installation difficulty is high, and the cost of the fan is increased.
Aiming at the problems in the prior art, the technical personnel in the field improve the fan with the outer rotor to a certain extent, and the outer rotor fan is designed by combining the advantages of the outer rotor permanent magnet motor, for example, the large outer rotor fan provided by the Chinese patent (publication No. CN204371716U) comprises the outer rotor motor and a chassis, wherein the chassis and the outer rotor motor are coaxially arranged, the chassis is fixedly connected with the rotor of the outer rotor motor and rotates along with the rotor, and a plurality of fan blades are arranged on one ring outside the chassis; the upper end of the central shaft of the outer rotor motor is connected with an extension rod, and the other end of the extension rod is fixed on the mounting surface through a mounting structure. This patent adopts the outer rotor electric machine to replace the axle output type motor among the prior art, has left out the mounting bracket of motor, has simplified the overall structure of fan, and whole weight reduces, has reduced the mounting structure load requirement, and it is more convenient to install.
In the above-mentioned patent, because large-scale external rotor fan is bulky, the rotational speed is high, produce easily when rotating and rock, it is unstable to utilize the extension rod as fixed knot structure can lead to the mounting structure when the fan moves, cause the potential safety hazard, and simultaneously, the extension rod angle can't be adjusted, can't set for the angle when hanging on the installation face, in addition, the flabellum needs extra installation component on external rotor motor through chassis fixed mounting in the above-mentioned patent, the easy focus skew of installation component when high-speed rotation, and because all installation components all are fixed in on external rotor motor's the external diameter, it will be infinitely enlargied to have the focus skew centrifugal force deviation slightly when high-speed rotates, further influence the stability of fan.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides an outer rotor permanent magnet motor with high load installation stability.
The purpose of the invention can be realized by the following technical scheme: the outer rotor permanent magnet motor is characterized by comprising a fixed shaft and a stator assembly fixedly connected with the fixed shaft, wherein a rotor is arranged on the outer side of the stator assembly, a front end cover and a rear end cover fixedly connected with the rotor are arranged on two sides of the rotor, a front bearing and a rear bearing are respectively arranged between the front end cover and the fixed shaft and between the front end cover and the rear end cover and between the front end cover and the fixed shaft, the fixed shaft extends out of the rear end cover, and a load connecting part is arranged on the front end cover.
The outer rotor permanent magnet motor is provided with the load connecting portion on the front end cover, the load connecting portion is integrated on the front end cover, and a connecting structure does not need to be additionally installed.
In the outer rotor permanent magnet motor, the front end cover and the load connecting part are integrated.
In the outer rotor permanent magnet motor, the rear end cover is provided with a connecting hole for the fixed shaft to extend out, and the connecting hole is provided with an oil seal.
In the outer rotor permanent magnet motor, the outer side of the fixed shaft is sleeved with an elastic snap ring for fixing the rear bearing, and the elastic snap ring is arranged between the rear bearing and the rear end cover.
During installation, the front end cover, the front bearing, the stator assembly, the rotor, the rear bearing and the elastic clamping ring are installed on the fixed shaft, the rear end cover is installed, the elastic clamping ring is arranged between the rear bearing and the rear end cover, the front bearing, the stator assembly and the rear bearing can be pressed on the front end cover, and locking of all axial parts is formed.
The invention also provides a fan applying the outer rotor permanent magnet motor, which comprises the outer rotor permanent magnet motor, wherein the outer rotor permanent magnet motor comprises a fixed shaft and a stator assembly fixedly connected with the fixed shaft, a rotor is arranged on the outer side of the stator assembly, a front end cover and a rear end cover fixedly connected with the rotor are arranged on two sides of the rotor, a front bearing and a rear bearing are respectively arranged between the front end cover and the fixed shaft and between the front end cover and the rear end cover and the fixed shaft, the fixed shaft extends out of the rear end cover, a load connecting part is arranged on the front end cover, and a fan assembly is connected onto the load connecting part.
Set up load connecting portion on the front end cover, fan assembly sets up on load connecting portion, and its axle center is more stable, rocks when rotating at a high speed for a short time, and load connecting portion directly integrate on the front end cover, and connection structure is simple, practices thrift the cost, can also reduce the fault rate simultaneously.
In the fan using the outer rotor permanent magnet motor, one end of the fixed shaft, which extends out of the rear end cover, is provided with a connecting flange, and the connecting flange is fixedly connected with a fan support. Utilize flange and fixed shaft to be connected, be used for being connected with the installation face through the fan support, its installation stability is higher, and the fan support can hang the angle needs according to reality and adjust, conveniently sets for the wind direction.
In the blower using the outer rotor permanent magnet motor, the blower bracket is further provided with a protection frame positioned on the outer ring of the fan assembly. The effect of fender bracket lies in protecting the flabellum of fan, prevents the flabellum damage, can also play the effect of air guide simultaneously.
In the above fan using the outer rotor permanent magnet motor, the fan assembly includes a first connecting hub fixedly connected to the load connecting portion, the first connecting hub is fixedly connected to a second connecting hub matched with the first connecting hub, a plurality of accommodating cavities are formed between the first connecting hub and the second connecting hub, and the fan blades are embedded in the accommodating cavities. Connect the hub through first connection hub and second and form the holding chamber, install the tip of flabellum at the holding intracavity for each flabellum can be easy to assemble and dismantle, and installation stability is high, according to the removable different flabellums of different use scenes, the combination degree of freedom is higher.
In the fan using the outer rotor permanent magnet motor, the connecting flange is fixedly arranged at one end of the fixed shaft, which extends out of the rear end cover, and a gap is reserved between the connecting flange and the rear end cover.
In foretell fan of using outer rotor permanent-magnet machine, fan support including be the bracing piece that cross circumference links firmly in the flange outside and set up the support frame in the bracing piece outside, the fender bracket set up on the support frame.
In the fan using the outer rotor permanent magnet motor, the outer side of the protection frame is also provided with a shutter for adjusting the wind direction. The purpose of setting up the tripe is in the angle of adjustable tripe, further conveniently adjusts the wind direction.
In the blower using the outer rotor permanent magnet motor, the blower bracket may further be provided with a variable frequency controller, and the variable frequency controller is electrically connected with the outer rotor permanent magnet motor. The variable frequency controller can realize the variable frequency of the motor so as to adjust the wind speed. The frequency conversion controller can be integrated on the fan bracket and also can be arranged outside the fan bracket through electric connection.
Compared with the prior art, this external rotor permanent-magnet machine sets up load connecting portion on the front end cover, but make the lug connection load on the front end cover, extra connection structure has been saved, the stability of motor operation has been increased, simultaneously the load is connected on the front end cover, it is nearer from the rotation axle center, the tolerance of beating is littleer, operating stability is higher, the fan of application this external rotor permanent-magnet machine, through set up flange on the fixed axle, and be used for being fixed in the fan on the installation face through the fan support, its installation stability is higher, and can set for the installation angle of fan support as required, operating stability is higher.
Drawings
Fig. 1 is a schematic structural view of a fan applying an outer rotor permanent magnet motor;
fig. 2 is a schematic perspective view of a fan applying an outer rotor permanent magnet motor;
FIG. 3 is a schematic cross-sectional view of a fan using an outer rotor permanent magnet motor;
FIG. 4 is an enlarged view of a portion of FIG. 3;
FIG. 5 is a schematic cross-sectional view of the present outer rotor permanent magnet machine;
fig. 6 is an exploded view of the present outer rotor permanent magnet motor.
In the figure, 1, an outer rotor permanent magnet motor; 2. a fixed shaft; 21. a connecting flange; 3. a stator assembly; 4. a rotor; 5. a front end cover; 51. a front bearing; 52. a load connection portion; 6. a rear end cap; 61. a rear bearing; 62. an elastic snap ring; 63. oil sealing; 7. a fan assembly; 71. a first connecting hub; 72. a second connecting hub; 73. an accommodating cavity; 74. a fan blade; 8. a fan bracket; 9. a protection frame.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 4, the fan using the outer rotor permanent magnet motor includes the outer rotor permanent magnet motor, the outer rotor permanent magnet motor includes a fixed shaft 2 and a stator assembly 3 fixedly connected with the fixed shaft 2, a rotor 4 is disposed on the outer side of the stator assembly 3, a front end cover 5 and a rear end cover 6 fixedly connected with the rotor 4 are disposed on two sides of the rotor 4, a front bearing 51 and a rear bearing 61 are respectively disposed between the front end cover 5 and the rear end cover 6 and the fixed shaft 2, the fixed shaft 2 extends out of the rear end cover 6, a load connecting portion 52 is disposed on the front end cover 5, and a fan assembly 7 is connected to the load connecting portion 52. The fixed shaft 2 is provided with a connecting flange 21 at one end extending out of the rear end cover 6, and the connecting flange 21 is fixedly connected with a fan bracket 8. And a protective frame positioned on the outer ring of the fan component 7 is also arranged on the fan bracket 8. 9 the fan assembly 7 includes a first connecting hub 71 fixedly connected to the load connecting portion 52, the first connecting hub 71 is fixedly connected to a second connecting hub 72 matched with the first connecting hub 71, a plurality of circumferentially and uniformly distributed accommodating cavities 73 are formed between the first connecting hub 71 and the second connecting hub 72, and fan blades 74 are embedded in the accommodating cavities 73.
The front end cover 5 is provided with the load connecting part 52, the fan assembly 7 is arranged on the load connecting part 52, the axis is more stable, the shake is small during high-speed rotation, the load connecting part 52 is directly integrated on the front end cover 5, the connecting structure is simple, the cost is saved, and meanwhile, the failure rate can be reduced. Utilize flange 21 to be connected with fixed axle 2, be used for being connected with the installation face through fan support 8, its installation stability is higher, and fan support 8 can hang the angle needs according to the reality and adjust, conveniently sets for the wind direction. The effect of fender bracket is in protecting the flabellum 74 of fan, prevents flabellum 74 damage. The first connecting hub 71 and the second connecting hub 72 form an accommodating cavity 73, and the end parts of the fan blades 74 are installed in the accommodating cavity 73, so that the fan blades 74 can be conveniently installed and detached, the installation stability is high, different fan blades 74 can be replaced according to different use scenes, and the combination freedom degree is higher.
In the fan applying the outer rotor permanent magnet motor, the connecting flange 21 is fixedly arranged at one end of the fixed shaft 2, which extends out of the rear end cover 6, and a gap is reserved between the connecting flange 21 and the rear end cover 6, so that the rear end cover 6 is prevented from interfering with the connecting flange 21 when rotating. Fan support 8 including being the bracing piece in the cross circumference links firmly in the flange 21 outside and setting up in the support frame in the bracing piece outside, the fender bracket set up on the support frame. In order to facilitate the adjustment of the wind direction, a louver (not shown) for adjusting the wind direction is arranged outside the protection frame. In order to increase the function of adjusting the wind speed of the fan, a variable frequency controller can be arranged on the fan bracket, or the variable frequency controller can be arranged at other places, and the variable frequency controller is electrically connected with the motor.
As shown in fig. 5 and 6, the outer rotor permanent magnet motor includes a fixed shaft 2 and a stator assembly 3 fixedly connected to the fixed shaft 2, a rotor 4 is disposed outside the stator assembly 3, a front end cover 5 and a rear end cover 6 fixedly connected to the rotor 4 are disposed on two sides of the rotor 4, a front bearing 51 and a rear bearing 61 are disposed between the front end cover 5 and the fixed shaft 2 and between the rear end cover 6 and the fixed shaft 2, the fixed shaft 2 extends out of the rear end cover 6, a load connection portion 52 is disposed on the front end cover 5, and the front end cover 5 and the load connection portion 52 are integrated. The rear end cover 6 is provided with a connecting hole for the fixed shaft 2 to extend out, and the connecting hole is provided with an oil seal 63. The outside cover of fixed axle 2 be equipped with the elastic snap ring 62 with rear bearing 61 is fixed, elastic snap ring 62 set up between rear bearing 61 and rear end cover 6.
The outer rotor permanent magnet motor is provided with the load connecting part 52 on the front end cover 5, the load connecting part 52 is integrated on the front end cover 5, and a connecting structure does not need to be additionally installed. During installation, the front end cover 5, the front bearing 51, the stator assembly 3, the rotor 4, the rear bearing 61 and the elastic clamping ring 62 are installed on the fixed shaft 2, and the rear end cover 6 is installed, so that the elastic clamping ring 62 is arranged between the rear bearing 61 and the rear end cover 6, the front bearing 51, the stator assembly 3 and the rear bearing 61 can be pressed on the front end cover 5, and locking of all axial components is formed.
This outer rotor permanent-magnet machine sets up load connecting portion 52 on front end housing 5 for but the lug connection load on front end housing 5, extra connection structure has been saved, the stability of motor operation has been increased, simultaneously the load is connected on front end housing 5, it is closer from the rotation axle center, the tolerance of beating is littleer, operating stability is higher, the fan of application this outer rotor permanent-magnet machine, through set up flange 21 on fixed axle 2, and be used for being fixed in the fan on the installation face through fan support 8, its installation stability is higher, and can set for the installation angle of fan support 8 as required, operating stability is higher.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (10)

1. The outer rotor permanent magnet motor is characterized by comprising a fixed shaft and a stator assembly fixedly connected with the fixed shaft, wherein a rotor is arranged on the outer side of the stator assembly, a front end cover and a rear end cover fixedly connected with the rotor are arranged on two sides of the rotor, a front bearing and a rear bearing are respectively arranged between the front end cover and the fixed shaft and between the front end cover and the rear end cover and between the front end cover and the fixed shaft, the fixed shaft extends out of the rear end cover, a load connecting part is arranged on the front end cover, and the front end cover and the load connecting part are integrated.
2. The outer rotor permanent magnet motor of claim 1, wherein the rear end cap is provided with a connection hole for the fixed shaft to extend out, and the connection hole is provided with an oil seal.
3. The outer rotor permanent magnet motor according to claim 1 or 2, wherein an elastic snap ring for fixing the rear bearing is sleeved outside the fixed shaft.
4. The fan using the outer rotor permanent magnet motor is characterized by comprising the outer rotor permanent magnet motor, the outer rotor permanent magnet motor comprises a fixed shaft and a stator assembly fixedly connected with the fixed shaft, a rotor is arranged on the outer side of the stator assembly, a front end cover and a rear end cover fixedly connected with the rotor are arranged on two sides of the rotor, a front bearing and a rear bearing are arranged between the front end cover and the fixed shaft and between the front end cover and the rear end cover and the fixed shaft respectively, the fixed shaft extends out of the rear end cover, a load connecting portion is arranged on the front end cover, and a fan assembly is connected onto the load connecting portion.
5. The blower applying the outer rotor permanent magnet motor according to claim 6, wherein a connecting flange is arranged at one end of the fixed shaft, which extends out of the rear end cover, and a blower bracket is fixedly connected to the connecting flange.
6. The blower applying the outer rotor permanent magnet motor according to claim 5, wherein a protection frame positioned on an outer ring of the fan assembly is further arranged on the blower bracket.
7. The blower applying the outer rotor permanent magnet motor according to claim 4, 5 or 6, wherein the fan assembly includes a first connecting hub fixedly connected to the load connecting portion, the first connecting hub is fixedly connected to a second connecting hub matched with the first connecting hub, a plurality of accommodating cavities are formed between the first connecting hub and the second connecting hub and are circumferentially and uniformly distributed, and fan blades are embedded and mounted in the accommodating cavities.
8. The blower applying the outer rotor permanent magnet motor according to claim 5 or 6, wherein the connecting flange is fixedly arranged at one end of the fixed shaft, which extends out of the rear end cover, and a gap is reserved between the connecting flange and the rear end cover.
9. The blower applying the outer rotor permanent magnet motor according to claim 5 or 6, wherein the blower bracket comprises a cross-shaped support rod circumferentially and fixedly connected to the outer side of the connecting flange and a support frame arranged on the outer side of the support rod, the protection frame is arranged on the support frame, and a louver used for adjusting the wind direction is further arranged on the outer side of the protection frame.
10. The blower applying the outer rotor permanent magnet motor according to claim 5, wherein a variable frequency controller is further disposed on the blower bracket, and the variable frequency controller is electrically connected with the outer rotor permanent magnet motor.
CN202010836694.8A 2020-08-19 2020-08-19 Outer rotor permanent magnet motor and fan using same Pending CN112383170A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010836694.8A CN112383170A (en) 2020-08-19 2020-08-19 Outer rotor permanent magnet motor and fan using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010836694.8A CN112383170A (en) 2020-08-19 2020-08-19 Outer rotor permanent magnet motor and fan using same

Publications (1)

Publication Number Publication Date
CN112383170A true CN112383170A (en) 2021-02-19

Family

ID=74586244

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010836694.8A Pending CN112383170A (en) 2020-08-19 2020-08-19 Outer rotor permanent magnet motor and fan using same

Country Status (1)

Country Link
CN (1) CN112383170A (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2929270Y (en) * 2006-03-22 2007-08-01 郭自刚 High power water tank heat radiation blower for motor vehicle
US20090196773A1 (en) * 2008-02-05 2009-08-06 Delta Electronics, Inc Fan and motor
CN203130558U (en) * 2013-03-27 2013-08-14 石家冰 Light plastic steel corrosion-resistant fan
CN205013330U (en) * 2015-06-12 2016-02-03 北京百正创源科技有限公司 Direct -cooled thermal power plant is with external rotor permanent magnetism fan system
CN206117384U (en) * 2016-09-28 2017-04-19 深圳市若腾科技有限公司 A motor for treadmill
CN207178101U (en) * 2017-08-30 2018-04-03 博顿液压股份有限公司 A kind of fan motor
CN208900384U (en) * 2018-05-23 2019-05-24 湖北梨威机械设备有限公司 A kind of novel axial flow fan
CN110107518A (en) * 2019-05-10 2019-08-09 仪坤动力科技(上海)有限公司 Blade and outer rotor integral fan
CN210889453U (en) * 2019-09-25 2020-06-30 重庆郎拓通风设备有限公司 Fan blade structure of fire-fighting smoke exhaust fan
CN213125702U (en) * 2020-08-19 2021-05-04 招国梅 Outer rotor permanent magnet motor and fan with same

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2929270Y (en) * 2006-03-22 2007-08-01 郭自刚 High power water tank heat radiation blower for motor vehicle
US20090196773A1 (en) * 2008-02-05 2009-08-06 Delta Electronics, Inc Fan and motor
CN203130558U (en) * 2013-03-27 2013-08-14 石家冰 Light plastic steel corrosion-resistant fan
CN205013330U (en) * 2015-06-12 2016-02-03 北京百正创源科技有限公司 Direct -cooled thermal power plant is with external rotor permanent magnetism fan system
CN206117384U (en) * 2016-09-28 2017-04-19 深圳市若腾科技有限公司 A motor for treadmill
CN207178101U (en) * 2017-08-30 2018-04-03 博顿液压股份有限公司 A kind of fan motor
CN208900384U (en) * 2018-05-23 2019-05-24 湖北梨威机械设备有限公司 A kind of novel axial flow fan
CN110107518A (en) * 2019-05-10 2019-08-09 仪坤动力科技(上海)有限公司 Blade and outer rotor integral fan
CN210889453U (en) * 2019-09-25 2020-06-30 重庆郎拓通风设备有限公司 Fan blade structure of fire-fighting smoke exhaust fan
CN213125702U (en) * 2020-08-19 2021-05-04 招国梅 Outer rotor permanent magnet motor and fan with same

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