CN108718146B - A-shaped modular stator bearingless outer rotor motor - Google Patents
A-shaped modular stator bearingless outer rotor motor Download PDFInfo
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- CN108718146B CN108718146B CN201810460455.XA CN201810460455A CN108718146B CN 108718146 B CN108718146 B CN 108718146B CN 201810460455 A CN201810460455 A CN 201810460455A CN 108718146 B CN108718146 B CN 108718146B
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- stator
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- permanent magnet
- iron core
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
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- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
Abstract
The invention discloses an A-shaped modular stator bearingless outer rotor motor, wherein a suspension cross iron core is coaxially sleeved in an outer rotor, the suspension cross iron core is provided with four same suspension permanent magnets which are connected into a cross structure, each silicon steel sheet magnetic guide strip is internally and fixedly embedded with one suspension permanent magnet, the outer end part of each silicon steel sheet magnetic guide strip is wound with a suspension winding, the suspension cross iron core divides the space in the outer rotor into four sectors of 90 degrees, each sector is internally provided with three same A-shaped modular stators, two same 10-degree magnetic isolation fixture blocks 8 and two same 5-degree magnetic isolation fixture blocks, a 10-degree magnetic isolation fixture block is fixedly clamped between every two adjacent A-shaped modular stators, and a 5-degree magnetic isolation fixture block is fixedly clamped between the suspension cross iron core and the closest A-shaped modular stator; the magnetic circuit between the stator and the rotor is shortened, the output torque of the motor is increased, the torque winding is separated from the suspension winding, and the magnetic field coupling generated by the winding is reduced.
Description
Technical Field
The invention relates to a bearingless motor structure, in particular to a hybrid excitation bearingless outer rotor motor structure.
Background
Most of the existing bearingless motors adopt an inner rotor structure, and most of the outer rotor motors are mechanical bearings. The mechanical bearing has the problems of complex structure, inconvenient maintenance, severe contact abrasion between the bearing and a rotor, generation of a large amount of friction heat to influence the normal work of the motor and the like. A small amount of bearingless reluctance outer rotor motors are only suitable for one excitation mode, and the problems of overlong magnetic circuits and the like exist, so that the output torque of the motors cannot meet the working conditions of flywheel batteries and the like which need large torque.
Disclosure of Invention
The invention aims to solve the problem that the output torque of the conventional bearingless outer rotor motor is small, and provides an A-shaped modular stator hybrid excitation bearingless outer rotor motor with larger output torque.
The invention relates to an A-shaped modular stator bearingless outer rotor motor, which adopts the technical scheme that: a suspension cross iron core is coaxially sleeved in the outer rotor, the suspension cross iron core is provided with four same suspension permanent magnets which are connected into a cross structure, a suspension permanent magnet is fixedly embedded in each silicon steel sheet magnetic strip, and a suspension winding is wound at the outer end part of each silicon steel sheet magnetic strip; the suspension cross iron core divides the space inside the outer rotor into four 90-degree sectors, each sector is provided with three same A-shaped modular stators, two same 10-degree magnetic isolation fixture blocks 8 and two same 5-degree magnetic isolation fixture blocks, a 10-degree magnetic isolation fixture block is fixedly clamped between every two adjacent A-shaped modular stators, and a 5-degree magnetic isolation fixture block is fixedly clamped between the suspension cross iron core and the closest A-shaped modular stator.
All the suspension permanent magnets are magnetized in the radial direction, and the magnetizing directions of two adjacent suspension permanent magnets are opposite.
Each A-shaped modular stator consists of a fan-shaped stator aluminum core, a stator iron core and a torque permanent magnet, the outer end of the stator aluminum core is fixedly connected with the stator iron core, the torque permanent magnet is fixedly embedded on the stator iron core, and a torque winding is wound on the stator iron core.
The stator core is of a fan-shaped structure, a U-shaped groove is formed in the middle of the stator core in the radial direction, the opening of the U-shaped groove faces outwards, and a torque permanent magnet is fixedly embedded between two side walls of the U-shaped groove.
Torque windings are wound on two side walls of the U-shaped groove, the winding directions of the torque windings on the same U-shaped groove are opposite, and the torque windings are located on the outer side of the torque permanent magnet.
Each torque permanent magnet is magnetized tangentially, and the magnetizing directions of all the torque permanent magnets are the same.
After the technical scheme is adopted, the invention has the advantages that:
1. the A-shaped modular stator is adopted, and a stator aluminum core structure is adopted, so that the weight of the motor is reduced, the magnetic path between the stator and the rotor is shortened, and the motor output torque is increased while the motor loss is reduced.
2. A torque permanent magnet is added in the A-shaped modular stator, a permanent magnet magnetic circuit which is the same as a winding loop is added, and the output torque of the motor is increased.
3. Compared with the traditional bearingless motor, the invention adopts the structure that the suspension cross iron core is embedded with the suspension permanent magnet, the positions of the torque winding and the suspension winding are separated as much as possible, the magnetic field coupling generated by the winding is reduced, and the influence on the torque is small.
Drawings
FIG. 1 is a schematic structural diagram of an A-shaped modular stator bearingless outer rotor motor according to the present invention;
FIG. 2 is a block diagram of the suspended cross core of FIG. 1;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is an enlarged view of the structure of a single A-shaped modular stator of FIG. 1;
FIG. 5 is a left side view of FIG. 4;
FIG. 6 is a schematic diagram of the torque generated by the motor of the present invention during operation;
FIG. 7 is a schematic diagram of the suspension force generated by the motor of the present invention during operation;
in the figure: 1. an outer rotor; 2. a torque permanent magnet; 3. a stator core; 4. a torque winding; 5. a suspended permanent magnet; 6. a suspension winding; 7. a stator aluminum core; 8.10 degrees of magnetic isolation fixture blocks; a magnetic isolation fixture block of 9.5 degrees; 10. and a suspended cross iron core.
Detailed Description
As shown in fig. 1, the outermost part of the present invention is an outer rotor 1, and the outer rotor 1 is made of silicon steel sheet and has 28 rotor teeth. A cross-shaped suspension cross iron core 10 is coaxially sleeved inside the outer rotor 1, the suspension cross iron core 10 is located at the centremost position, a radial air gap is reserved between the rotor teeth of the outer rotor 1 and the suspension cross iron core 10, and the size of the radial air gap is 0.5 mm.
As shown in fig. 2 and 3, the suspension cross iron core 10 is composed of four same suspension permanent magnets 5 and four same silicon steel sheet magnetic strips, the four same silicon steel sheet magnetic strips are connected into a cross structure, and a suspension permanent magnet 5 is fixedly embedded in each silicon steel sheet magnetic strip. The center O of the suspended cross iron core 10 is the center of the present invention, the outer end surface of each silicon steel sheet magnetic guide strip is an arc surface with the center O as the center of circle and the radius as R, and a radial air gap is formed between the outer end arc surface and the outer rotor 1.
The axial thickness of the suspended cross iron core 10 is B, and the length of each silicon steel sheet magnetic strip extending in the radial direction is H, that is, the radial length between the inner end face and the outer end face of each silicon steel sheet magnetic strip is H. A suspension permanent magnet 5 is embedded at the position 2/5H away from the inner end of each silicon steel sheet magnetic conduction strip, the tangential width and the axial thickness of the suspension permanent magnet 5 are respectively equal to those of the silicon steel sheet magnetic conduction strip, and the suspension permanent magnet 5 is flush with the silicon steel sheet magnetic conduction strips when embedded in the silicon steel sheet magnetic conduction strips. The suspension permanent magnets 5 are magnetized in the radial direction, and the magnetizing directions of the two adjacent suspension permanent magnets 5 are opposite. And a suspension winding 6 is wound on each silicon steel sheet magnetic strip close to the outer end part of each silicon steel sheet magnetic strip on the outer side of the suspension permanent magnet 5.
The suspension cross iron core 10 divides the space inside the outer rotor 1 into four sectors of 90 degrees, and each sector is provided with three A-shaped modular stators with the same shape and size, two identical magnetic isolation fixture blocks 8 of 10 degrees and two identical magnetic isolation fixture blocks 9 of 5 degrees. The A-shaped modular stator and the 10-degree magnetic-isolation fixture block 8 in the same sector have the same center. Each A-shaped modular stator occupies a 20-degree sector area, a 10-degree magnetic isolation clamping block 8 is fixedly clamped between every two adjacent A-shaped modular stators, and a 5-degree magnetic isolation clamping block 9 is fixedly clamped between the suspended cross iron core 10 and the closest A-shaped modular stator. Namely, three A-shaped modular stators, two 10-degree magnetic isolation fixture blocks 8 and two 5-degree magnetic isolation fixture blocks 9 jointly form a 90-degree sector. The outer diameter of each a-shaped modular stator is equal to the outer diameter of the floating cross core 10. The axial thickness of each A-shaped modular stator is the same as that of the suspended cross iron core 10 and is B.
As shown in fig. 1, 4 and 5, each a-shaped modular stator is composed of a stator aluminum core 7, a stator iron core 3 and a torque permanent magnet 2. A torque winding 4 is wound around the stator core 3. The stator aluminum core 7 is a fan-shaped aluminum block structure with an angle of 20 degrees and a radius of 2/3H, the outer end of the fan-shaped aluminum block structure is fixedly connected with the stator iron core 3, and the torque permanent magnet 2 is fixedly embedded on the stator iron core 3. The outer diameter of stator core 3 is equal to the outer diameter of suspended cross core 10, and a radial air gap is formed between the outer end face of stator core 3 and outer rotor 1. The stator core 3 has a fan-shaped structure with a U-shaped groove formed in the radial direction at the center, and the fan-shaped angle is 20 °. The opening of the U-shaped groove faces outwards, the bottom of the U-shaped groove is in seamless fixed joint with the outer end of the stator aluminum core 7, the radial length of the bottom of the U-shaped groove is b, and the tangential width of the two side walls of the U-shaped groove is equal to the radial length of the bottom of the U-shaped groove and is also b. A torque permanent magnet 2 is fixedly embedded between two side walls of the U-shaped groove, the torque permanent magnet 2 is also in a fan shape, and the fan-shaped angle is also 20 degrees. The axial thickness of the torque permanent magnet 2 is equal to the axial thickness of the stator core 3. The outer diameter of the torque permanent magnet 2 is smaller than that of the stator core 3, and the inner diameter of the torque permanent magnet 2 is larger than the outer diameter of the bottom of the U-shaped groove of the stator core 3. Each torque permanent magnet 2 is magnetized tangentially, and the magnetizing directions of all the torque permanent magnets 2 are the same.
The stator aluminum core 7 is connected with the stator iron core 3 through welding. The two side walls of the U-shaped groove of the stator core 3 are wound with the torque windings 4, and the winding directions of the torque windings 4 on the same U-shaped groove are opposite. The torque winding 4 is positioned at the outer side of the torque permanent magnet 2, and the inner diameter of the torque permanent magnet 2 is larger than the outer diameter of the suspension winding 6.
The outer diameter of the 10-degree magnetic isolation fixture block 8 is larger than the inner diameter of the stator core 3 but smaller than the inner diameter of the torque permanent magnet 2. The outer diameters of the 10-degree magnetic isolation fixture block 8 and the 5-degree magnetic isolation fixture block 9 are the same.
As shown in fig. 6, the working principle of the present invention is to take one a-shaped modular stator as an example, the torque winding 4 is energized to form a clockwise magnetic field, i.e. the torque winding magnetic field 12, in the stator core 3 and the outer rotor 1, and the path of the torque winding magnetic field 12 sequentially passes through the stator core 3 and the outer rotor 1 and then returns to the stator core 3. The same principle as the switched reluctance motor, according to the minimum reluctance principle, the reluctance torque can be generated after the torque windings 4 in each A-shaped modular stator are sequentially electrified. Meanwhile, due to the existence of the torque permanent magnet 2, a clockwise magnetic field, namely a torque permanent magnet magnetic field 11, is formed in the torque permanent magnet 2, the stator core 3 and the outer rotor 1, the torque permanent magnet magnetic field 11 enters the outer rotor 1 after passing through the stator core 3 by the torque permanent magnet 2 and then enters the torque permanent magnet 2 after returning to the stator core 3, and the direction of the torque permanent magnet magnetic field 11 is the same as that of the torque winding magnetic field 12, so that the total torque of the motor can be increased.
As shown in fig. 7, the X1 axis and the X2 axis are horizontal axes passing through the center O of the floating cross iron core 10, the directions of the X1 axis and the X2 axis are opposite, the Y1 axis and the Y2 axis are vertical axes passing through the center O of the floating cross iron core 10, and the directions of the Y1 axis and the Y2 axis are opposite. When the motor suspends, when suspension winding 6 does not circular telegram, because the existence of suspension permanent magnet 5, can produce suspension permanent magnet magnetic field 14 in suspension cross iron core 10 and outer rotor 1, suspension permanent magnet magnetic field 14 divides into four ways: the first path is that the suspension permanent magnet 5 in the X1 direction enters the outer rotor 1, then enters the suspension permanent magnet 5 in the Y1 direction along the outer rotor 1, and finally returns to the suspension permanent magnet 5 in the X1 direction; the second path is that the suspension permanent magnet 5 in the X1 direction enters the outer rotor 1, then enters the suspension permanent magnet 5 in the Y2 direction along the outer rotor 1, and finally returns to the suspension permanent magnet 5 in the X1 direction; the third path is that the suspension permanent magnet 5 in the X2 direction enters the outer rotor 1, then enters the suspension permanent magnet 5 in the Y1 direction along the outer rotor 1, and finally returns to the suspension permanent magnet 5 in the X2 direction; the fourth way is that the levitating permanent magnet 5 in the X2 direction enters the outer rotor 1, enters the levitating permanent magnet 5 in the Y2 direction after going along the outer rotor 1, and finally returns to the levitating permanent magnet 5 in the X2 direction. When the suspension winding 6 in the Y1 and Y2 directions is electrified, a suspension winding magnetic field 13 is generated in the suspension cross iron core 10. In the magnetic strip in the Y1 direction, the direction of the levitation winding magnetic field 13 faces the Y2 direction, and in the magnetic strip in the Y2 direction, the direction of the levitation winding magnetic field 13 faces the Y2 direction, so that the levitation winding magnetic field 13 and the levitation permanent magnet magnetic field 14 in the Y1 direction are superimposed, and the levitation winding magnetic field 13 and the levitation permanent magnet magnetic field 14 in the Y2 direction are subtracted, so that the magnetic field strength in the Y1 direction is greater than that in the Y2 direction, and according to maxwell's principle, a levitation force Fy in the Y1 direction is generated. Meanwhile, the influence of the levitation winding magnetic field 13 and the levitation permanent magnet magnetic field 14 in the Y1 and Y2 directions in the X1 and X2 directions is the same, so that levitation forces in the X1 and X2 directions are not generated.
Claims (5)
1. The utility model provides a no bearing external rotor electric machine of A shape modular stator, has external rotor (1), characterized by: a suspension cross iron core (10) is coaxially sleeved in the outer rotor (1), the suspension cross iron core (10) is provided with four same suspension permanent magnets (5) which are connected into a cross structure, a suspension permanent magnet (5) is fixedly embedded in each silicon steel sheet magnetic strip, and a suspension winding (6) is wound at the outer end part of each silicon steel sheet magnetic strip; the suspension cross iron core (10) divides the space inside the outer rotor (1) into four 90-degree sectors, each sector is provided with three same A-shaped modular stators, two same 10-degree magnetic isolation fixture blocks 8 and two same 5-degree magnetic isolation fixture blocks (9), a 10-degree magnetic isolation fixture block (8) is fixedly clamped between every two adjacent A-shaped modular stators, and a 5-degree magnetic isolation fixture block (9) is fixedly clamped between the suspension cross iron core (10) and the closest A-shaped modular stator; all the suspension permanent magnets (5) are magnetized in the radial direction, and the magnetizing directions of two adjacent suspension permanent magnets (5) are opposite; each A-shaped modular stator consists of a fan-shaped stator aluminum core (7), a stator iron core (3) and a torque permanent magnet (2), the outer end of the stator aluminum core (7) is fixedly connected with the stator iron core (3), the torque permanent magnet (2) is fixedly embedded on the stator iron core (3), and a torque winding (4) is wound on the stator iron core (3); the stator core (3) is of a fan-shaped structure with a U-shaped groove in the radial direction in the middle, the opening of the U-shaped groove faces outwards, and a torque permanent magnet (2) is fixedly embedded between two side walls of the U-shaped groove; torque windings (4) are wound on two side walls of the U-shaped groove, the winding directions of the torque windings (4) on the same U-shaped groove are opposite, and the torque windings (4) are positioned on the outer side of the torque permanent magnet (2); each torque permanent magnet (2) is magnetized tangentially, and the magnetizing directions of all the torque permanent magnets (2) are the same.
2. The a-shaped modular stator bearingless outer rotor motor as claimed in claim 1, wherein: the outer diameter of the stator core (3) is equal to that of the suspended cross core (10), and the outer diameter of the 10-degree magnetism isolating clamping block 8 is larger than the inner diameter of the stator core (3) but smaller than the inner diameter of the torque permanent magnet (2).
3. The a-shaped modular stator bearingless outer rotor motor as claimed in claim 1, wherein: the axial thickness of the torque permanent magnet (2) is equal to the axial thickness of the stator core (3).
4. The a-shaped modular stator bearingless outer rotor motor as claimed in claim 1, wherein: the outer diameter of the torque permanent magnet (2) is smaller than that of the stator core (3), and the inner diameter of the torque permanent magnet (2) is larger than the outer diameter of the bottom of the U-shaped groove of the stator core (3).
5. The a-shaped modular stator bearingless outer rotor motor as claimed in claim 1, wherein: the A-shaped modular stators and the 10-degree magnetic isolation fixture blocks (8) in the same sector have the same center, and the axial thickness of each A-shaped modular stator is the same as that of the suspended cross iron core (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810460455.XA CN108718146B (en) | 2018-05-15 | 2018-05-15 | A-shaped modular stator bearingless outer rotor motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810460455.XA CN108718146B (en) | 2018-05-15 | 2018-05-15 | A-shaped modular stator bearingless outer rotor motor |
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| CN108718146A CN108718146A (en) | 2018-10-30 |
| CN108718146B true CN108718146B (en) | 2020-03-31 |
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| CN201810460455.XA Active CN108718146B (en) | 2018-05-15 | 2018-05-15 | A-shaped modular stator bearingless outer rotor motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI689155B (en) * | 2018-12-17 | 2020-03-21 | 建準電機工業股份有限公司 | Outer-rotor motor |
| CN214388689U (en) * | 2020-09-21 | 2021-10-15 | 广州源动智慧体育科技有限公司 | Loading motor of force instrument and force instrument |
| CN113410927A (en) * | 2021-05-24 | 2021-09-17 | 东南大学 | Modularized motor with interphase magnetic isolation capability |
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| JP2008295206A (en) * | 2007-05-24 | 2008-12-04 | Tokyo Univ Of Science | Bearingless motor and bearingless motor control system |
| CN101922511A (en) * | 2010-08-25 | 2010-12-22 | 江苏大学 | Permanent-magnet bias outer rotor radial AC hybrid magnetic bearing |
| CN106385203B (en) * | 2016-09-30 | 2018-03-13 | 南京工程学院 | A kind of axial phase inner stator permanent magnetism off-set magnetic suspension switching magnetic-resistance fly-wheel motor |
| CN107769622B (en) * | 2017-11-30 | 2019-05-17 | 北京理工大学 | A kind of axial magnetic formula motor |
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