CN212367088U

CN212367088U - AC permanent-magnet brushless motor

Info

Publication number: CN212367088U
Application number: CN202020716162.6U
Authority: CN
Inventors: 刘维军
Original assignee: Shaanxi Yulin Energy Group Hengshan Coal Power Co ltd
Current assignee: Shaanxi Yulin Energy Group Hengshan Coal Power Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2021-01-15
Anticipated expiration: 2030-04-30

Abstract

The utility model discloses an alternating current permanent magnet brushless motor, including motor casing, fixed the setting in the inboard stator in motor casing axial both ends, set up in the motor casing and with the external rotor that the stator matches, rotate with motor casing one end and be connected and with external rotor fixed connection's external rotor output shaft, set up in the motor casing and with the internal rotor that stator and external rotor all match, rotate with the motor casing other end and be connected and with internal rotor fixed connection's internal rotor output shaft to and the dc-to-ac converter of being connected with the stator electricity. The utility model has the characteristics of disk permanent-magnet machine fixes the stator in the inboard of both ends lid, and permanent magnetism inner rotor fixes the common rotation on the inner rotor output shaft, and claw utmost point rotor is located between double-phase stator and the inner rotor to each other becomes 90 electrical angle, fixes jointly and rotates together on the outer rotor output shaft, only needs can the coordinated work through one set of double-phase dc-to-ac converter, realizes brushless feed and the regulation of the rotational speed/torque difference between two pivots.

Description

AC permanent-magnet brushless motor

Technical Field

The present invention relates to a motor, and more particularly, to an ac permanent magnet brushless motor.

Background

A conventional motor is generally composed of a stator and a rotor. Because the motor only has one rotor, single-shaft output with single speed can be realized. In the application occasions of torpedo propulsion, electric automobiles, wind power generation and the like, the motor is required to have double-shaft output capacity of providing two independent rotating speeds, and the function cannot be realized by the traditional motor.

In the existing dual-rotor motor, the dual-rotor hybrid composite permanent magnet motor disclosed in the application number 200510014393.2 has brushes and slip rings, which results in low efficiency and reliability. The brushless double-rotor motor disclosed in the application number 200610014350.9 realizes brushless and improves reliability, and because the double-feed technology is adopted, the outer rotor is formed by windings, so that copper loss is large, the manufacturing or maintenance of the outer rotor windings is very inconvenient, and the whole weight and the whole volume are also large. The brushless feed double-rotor motor disclosed as 200910179233.1 is improved in efficiency, maintenance and reliability, but because the three-phase stator winding, the claw pole outer rotor and the magnetic steel inner rotor are independent respectively, the utilization rate of the inner rotor, the outer rotor and the magnetic steel inner rotor is only 2/3, and in addition, the winding is inconvenient to embed, the batch production is difficult, and the maintenance and the replacement of the intermediate phase winding are also inconvenient.

SUMMERY OF THE UTILITY MODEL

For overcoming the problems existing in the prior art, the utility model provides an alternating current permanent magnet brushless motor which has compact structure, small volume, light weight, high efficiency, is suitable for batch production and is convenient for disassembly and assembly maintenance.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

alternating current permanent magnet brushless motor, including motor casing, the fixed stator that sets up in motor casing axial both ends inboard, set up in motor casing and with the external rotor of stator matching, rotate with motor casing one end and be connected and with external rotor fixed connection's external rotor output shaft, set up in motor casing and with the internal rotor that stator and external rotor all match, rotate with the motor casing other end and be connected and with internal rotor fixed connection's internal rotor output shaft to and the dc-to-ac converter of being connected with the stator electricity. Preferably, a bearing is used as a rotary connecting part between the output shaft and the motor housing.

Further, the motor housing comprises a cylindrical shell and end covers fixed at two ends of the shell respectively and used for sealing the shell, wherein through holes for the output shaft to pass through are formed in the end covers, and the stator is fixed on the inner side of the end covers.

Further, the stator comprises a stator core which is connected with an end cover of the motor shell and is in a ring shape and concentric with the output shaft, and a stator winding which is arranged on the stator core, wherein the section of the stator core is in a concave shape, the stator winding is arranged in a groove of the stator core, and the openings of the grooves of the two stator cores are opposite in the positive direction.

Further, the outer rotor comprises a disk-shaped outer rotor iron core connected with the outer rotor output shaft and an even number of outer rotor claw poles which are fixed on the outer rotor iron core, circumferentially and uniformly distributed by taking the axis as the center and matched with the stator, wherein the cross section of each outer rotor claw pole on the axial plane is L-shaped, one edge of each outer rotor claw pole is in the radial direction, the other edge of each outer rotor claw pole is in the axial direction, and one edge of each adjacent outer rotor claw pole in the axial direction is respectively positioned at the outer end and the inner end of the radial direction.

Specifically, the outer rotor claw poles are in a fan-folded sector shape on a radial plane, and a gap exists between adjacent outer rotor claw poles.

Furthermore, the outer edge of the outer rotor core is provided with an outer rotor core extension part extending along the axial direction, and the extension tail end of the outer rotor core is fixedly connected with a second outer rotor core, so that an inner cavity for accommodating an inner rotor is formed in the outer rotor core; the second outer rotor iron core is also in a disc shape, the middle part of the second outer rotor iron core is provided with a through hole for the inner rotor output shaft to pass through and a gap exists between the second outer rotor iron core and the inner rotor output shaft, and the second outer rotor iron core is provided with the same outer rotor claw poles in the same way as the outer rotor iron core.

Specifically, the cross sections of the outer rotor core, the outer rotor core extension portion and the second outer rotor core on the axial plane are rectangular with a notch, and the notch corresponds to the through hole in the second outer rotor core.

In order to facilitate heat dissipation, a plurality of heat dissipation holes are formed in the outer rotor iron core extension portion along the annular wall of the outer rotor iron core extension portion.

Furthermore, a plurality of fan blades are arranged on the extension part of the outer rotor iron core along the annular wall of the extension part.

Still further, the inner rotor includes the inner rotor iron core that is connected with inner rotor output shaft and is discoid and settle in the inner chamber of outer rotor to and the inner rotor permanent magnetism magnet steel that quantity and position all match with outer rotor claw pole, wherein, keep the clearance that can supply relative motion between inner rotor and the outer rotor.

Further, the ends of the outer rotor output shaft and the inner rotor output shaft in the motor shell can be provided with positioning balls so as to ensure accurate installation positions.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) the utility model has the characteristics of disk permanent-magnet machine, fix the stator in the inboard of both ends end cover, the inner rotor of taking permanent-magnet steel fixes common rotation on the inner rotor output shaft, the outer rotor of taking double-phase claw utmost point is located between double-phase stator and the inner rotor, and each other becomes 90 electrical angle, fix jointly and rotate together on the outer rotor output shaft, it only needs can control the interior outer rotor coordination work through one set of double-phase dc-to-ac converter, realize brushless feed and the regulation of the rotational speed/torque difference between the two pivots, and its is small, light in weight, high efficiency, low cost, compact structure, be fit for in batches, easily dismouting, easy maintenance, wide application prospect has, and is suitable for popularization and application.

(2) The utility model discloses fix the stator in the end cover inboard, reduced motor casing's radial width, reduced the volume, its both ends are installed respectively moreover, and dismouting that can be very convenient is maintained.

(3) The utility model discloses a stator core slot is to relative, and in stator winding can very conveniently the embedded groove to only need pull down the end cover and can maintain stator winding, it is fairly convenient.

(4) The utility model discloses an outer rotor passes through the fixed outer rotor core of detachable mode and the outer rotor core of second to make it form the inner chamber that holds the inner rotor through outer rotor core extension, make full use of the space in the motor housing, guaranteed inner structure's compactness, also make whole volume reduce.

(5) The utility model discloses an external rotor claw utmost point is located between stator winding and the inner rotor permanent magnetism magnet steel, forms 90 electrical angle each other, coordinates the rotational speed of two output shafts jointly.

(6) The utility model discloses an all keep appropriate clearance between stator, external rotor and the inner rotor, guarantee pivoted flexibility and no interference nature on the one hand, on the other hand also makes the inside circulation of air of motor casing, the heat dissipation of being convenient for.

(7) The utility model discloses still set up the heat effluvium that the louvre produced in the inner chamber of being convenient for on outer rotor to further set up the flabellum, promote the inside heat dissipation of reinforcing when the external rotor rotates, improve the radiating efficiency when the external rotor is relative motion including moreover.

(8) Because the utility model discloses well each part is all erection joint in the axial direction, can effectively save the assemble duration to and it is more convenient when the maintenance.

Drawings

Fig. 1 is a schematic sectional view of the present invention.

Fig. 2 is a schematic end view of the stator winding of the present invention.

Fig. 3 is a schematic end view of the claw pole of the outer rotor in the present invention.

Fig. 4 is the end face schematic view of the inner rotor magnetic steel of the utility model.

In the drawings, the names of the parts corresponding to the reference numerals are as follows:

1-shell, 2-end cover, 3-stator iron core, 4-stator winding, 5-inner rotor iron core, 6-inner rotor permanent magnet steel, 7-outer rotor iron core, 8-outer rotor claw pole, 9-outer rotor iron core extension, 10-second outer rotor iron core, 11-inner cavity, 12-heat dissipation hole, 13-fan blade, 14-outer rotor output shaft, 15-inner rotor output shaft and 16-inverter.

Detailed Description

The present invention will be further described with reference to the following drawings and examples, and embodiments of the present invention include, but are not limited to, the following examples.

Examples

As shown in fig. 1 to 4, the ac permanent magnet brushless motor includes a motor housing, a stator, an inner rotor output shaft 15, an outer rotor output shaft 14, an inverter 16, and the like, wherein the inverter is preferably a two-phase inverter, and the specific configurations of the components are as follows:

the motor housing is mainly used for accommodating and protecting various components, and particularly comprises a shell 1 and an end cover 2. The outer shell is cylindrical, the two end covers are respectively fixed at the two ends of the outer shell to form a space for accommodating each part, a through hole is formed in the center of each end cover, and the inner rotor output shaft and the outer rotor output shaft are respectively arranged in the through holes of the two end covers through bearings and penetrate through the through holes to output torque to the outside. More specifically, the end cover also has a corresponding conventional structure to facilitate the installation of the shaft and the bearing, which is not described in detail in this embodiment. Furthermore, in order to ensure accurate installation clearance between the inner rotor and the outer rotor, a positioning ball structure can be arranged at the end parts of the inner rotor and the outer rotor in the shell, so that the inner rotor and the outer rotor can keep relative positions and ensure the flexibility of relative rotation.

The stator comprises a stator core 3 and a stator winding 4, wherein the stator core is annular, the section of the stator core is concave, the stator core is coaxial and concentric with the axial direction, the back of an opening is fixed on the inner side of an end cover, the opening faces to the other stator, namely the openings of the grooves of the two stator cores are opposite in the positive direction; the stator winding is embedded in the groove of the stator core, and the wire end of the stator winding is connected with the inverter, so that the winding can generate an electromagnetic field after being electrified.

The inner rotor comprises an inner rotor iron core 5 and inner rotor permanent magnet steel 6, and proper gaps are kept between the inner rotor iron core and each part of the outer rotor; the inner rotor iron core is disc-shaped and is coaxially and fixedly connected with an inner rotor output shaft, 8 inner rotor permanent magnet steel magnets are respectively and fixedly installed on two disc-shaped sides of the inner rotor iron core, each side is circumferentially and uniformly distributed by taking the axis as the center, and the position of each side corresponds to the annular position formed by the stator winding.

The outer rotor comprises an outer rotor iron core 7, outer rotor claw poles 8, outer rotor iron core extension parts 9 and a second outer rotor iron core 10. The outer rotor iron core is disc-shaped, the diameter of the outer rotor iron core is slightly larger than that of the inner rotor iron core, and the outer rotor iron core is coaxially and fixedly connected with an outer rotor output shaft and is positioned between the stator and the inner rotor; the outer rotor iron core extension part is arranged in an extending mode along the disc-shaped edge of the outer rotor iron core in the axial direction, the extending tail end of the outer rotor iron core is fixedly connected with a second outer rotor iron core, the shape and the size of the second outer rotor iron core are basically the same as those of the outer rotor iron core, a through hole for avoiding an output shaft of the inner rotor is formed in the center of the second outer rotor iron core, the outer rotor iron core extension part and the second outer rotor iron core form a closed inner cavity 11 only taking the through hole as an outlet, the cross sections of the inner cavity and the wall of the inner cavity on an axial plane are rectangular, a notch is formed, the through hole corresponds to the notch, the inner rotor is arranged in the inner cavity, proper gaps are; the outer rotor claw poles are respectively and fixedly arranged on the outer rotor iron core and the second outer rotor iron core by 8, are uniformly distributed in a circumference manner by taking the axis as the center, and the positions of the outer rotor claw poles correspond to the annular position formed by the stator winding and the position of the inner rotor permanent magnet steel; finally, proper gaps are kept among the stator, the inner rotor and the outer rotor, and the stator, the inner rotor and the outer rotor are sequentially arranged along the axial direction.

The cross section of the outer rotor claw pole on the axial plane is L-shaped, one edge of the outer rotor claw pole is in the radial direction, the other edge of the outer rotor claw pole is in the axial direction, and one edge of every two adjacent outer rotor claw poles in the axial direction is respectively positioned at the outer end and the inner end of the radial direction. More specifically, the outer rotor claw poles are in a fan-folded sector shape on a radial plane, and a gap exists between every two adjacent outer rotor claw poles; correspondingly, the shape and the size of the inner rotor permanent magnet steel are matched with those of the outer rotor claw poles on the radial plane.

Further, in order to facilitate internal heat dissipation, a plurality of heat dissipation holes 12 are formed in the extension portion of the outer rotor core along the circumferential wall of the extension portion, namely, the heat dissipation holes are formed in the inner cavity side plate, when the inner rotor and the outer rotor move relatively, air in the inner cavity and the shell generates disturbance along with rotation of the inner rotor and the outer rotor, and the air flows to take away heat to achieve heat dissipation. In order to further improve the heat dissipation effect, a plurality of fan blades 13 are further arranged on the annular wall, so that air disturbance is accelerated when the outer rotor rotates, air flows faster, and heat dissipation is faster.

The utility model discloses at the during operation, by double-phase dc-to-ac converter access power, make stator winding circular telegram produce the electromagnetic field, the electromagnetic field combined action that two stator windings produced makes inner rotor and external rotor rotation respectively, drives the output shaft separately and counterpoints the acting.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and are not limitations on the protection scope of the present invention, but all the changes made by adopting the design principle of the present invention and performing non-creative work on this basis shall fall within the protection scope of the present invention.

Claims

1. The alternating current permanent magnet brushless motor is characterized by comprising a motor shell, stators fixedly arranged on the inner sides of the two axial ends of the motor shell, an outer rotor arranged in the motor shell and matched with the stators, an outer rotor output shaft (14) connected with one end of the motor shell in a rotating mode and fixedly connected with the outer rotor, an inner rotor arranged in the motor shell and matched with the stators and the outer rotor, an inner rotor output shaft (15) connected with the other end of the motor shell in a rotating mode and fixedly connected with the inner rotor, and an inverter (16) electrically connected with the stators.

2. An ac permanent-magnet brushless motor according to claim 1, wherein the motor housing comprises a cylindrical housing (1), and end caps (2) fixed to both ends of the housing to close the housing, wherein the end caps are provided with through holes for the output shaft to pass through, and the stator is fixed inside the end caps.

3. An ac permanent magnet brushless motor according to claim 2, wherein the stator comprises a stator core (3) connected to an end cap of the motor housing and having a ring shape concentric with the output shaft, and a stator winding (4) provided on the stator core, wherein the stator core has a "concave" shape in cross section, the stator winding is disposed in a groove of the stator core, and the groove openings of the two stator cores are diametrically opposed.

4. The ac permanent magnet brushless motor according to claim 2, wherein the outer rotor includes a disk-shaped outer rotor core (7) connected to the outer rotor output shaft, and an even number of outer rotor claw poles (8) fixed to the outer rotor core, circumferentially and uniformly distributed around the axis and matching with the stator, wherein the cross section of each outer rotor claw pole on the axial plane is L-shaped, one side of each outer rotor claw pole is located in the radial direction, the other side of each outer rotor claw pole is located in the axial direction, and one side of each adjacent outer rotor claw pole in the axial direction is located in the outer end and the inner end of the radial direction.

5. The ac permanent magnet brushless motor of claim 4, wherein the outer rotor claw poles are fan-folded in a radial plane, and a gap exists between adjacent outer rotor claw poles.

6. An AC permanent-magnet brushless motor according to claim 4 or 5, characterized in that the outer periphery of the outer rotor core is provided with an outer rotor core extension (9) extending in the axial direction, and a second outer rotor core (10) is fixedly connected to the extended end thereof, thereby forming an inner cavity (11) for housing an inner rotor therein; the second outer rotor iron core is also in a disc shape, the middle part of the second outer rotor iron core is provided with a through hole for the inner rotor output shaft to pass through and a gap exists between the second outer rotor iron core and the inner rotor output shaft, and the second outer rotor iron core is provided with the same outer rotor claw pole (8) in the same way as the outer rotor iron core.

7. The ac permanent magnet brushless motor according to claim 6, wherein the cross-section of the outer rotor core, the outer rotor core extension, and the second outer rotor core on the axial plane is rectangular with a notch corresponding to the through hole of the second outer rotor core.

8. The AC permanent magnet brushless motor according to claim 6, wherein the extension of the outer rotor core has a plurality of heat dissipation holes (12) along its circumferential wall.

9. An AC permanent-magnet brushless motor according to claim 6, characterized in that said outer rotor core extension is further provided with a plurality of fan blades (13) along its circumferential wall.

10. The ac permanent-magnet brushless motor according to claim 6, wherein the inner rotor comprises an inner rotor core (5) connected to the output shaft of the inner rotor and having a disk shape and disposed in the inner cavity of the outer rotor, and inner rotor permanent-magnet steel magnets (6) matching with the outer rotor claws in number and position, wherein a gap for relative movement is maintained between the inner rotor and the outer rotor.