CN116599248A - 12/14 bearingless switch reluctance motor and design method thereof - Google Patents
12/14 bearingless switch reluctance motor and design method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000000725 suspension Substances 0.000 claims abstract description 69
- 238000004804 winding Methods 0.000 claims abstract description 37
- 238000005339 levitation Methods 0.000 claims abstract description 23
- 230000004323 axial length Effects 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 26
- 230000004907 flux Effects 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 230000035699 permeability Effects 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- H02K1/12—Stationary parts of the magnetic circuit
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
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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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
- H02K1/246—Variable reluctance rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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- Y02T10/64—Electric machine technologies in electromobility
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Abstract
本发明公开了本发明公开一种12/14无轴承开关磁阻电机及其设计方法，包括双片式的转子和定子。转子铁心外圆周均匀设置14个转子极。定子包括悬浮铁心、转矩铁心和隔磁材料，在悬浮铁心的X和Y方向设有4个悬浮极，径向相对的悬浮绕组通直流电且串联；在两个悬浮极之间通过隔磁材料设有一个转矩铁心，每个转矩铁心设有两个转矩极，其上设有转矩绕组，相对的4个转矩极绕组串联为一相。转子极弧度与转矩极弧度相等，都为悬浮极弧度的一半。其设计方法是：根据电磁功率需求确定转矩铁心的内外径，接着确定转矩铁心轴向长度；根据转矩铁心内径、悬浮极弧长与给定悬浮力需求确定悬浮极的轴向长度，取二者中长的作为转子铁心轴向总长度。
The invention discloses a 12/14 bearingless switched reluctance motor and a design method thereof, which include a double-plate rotor and a stator. 14 rotor poles are evenly arranged on the outer circumference of the rotor core. The stator includes a suspension core, a torque core and a magnetic isolation material. There are 4 suspension poles in the X and Y directions of the suspension core, and the radially opposite suspension windings are connected in series; A torque core is provided, and each torque core is provided with two torque poles, on which are provided torque windings, and the opposite four torque pole windings are connected in series to form a phase. The arc of the rotor pole is equal to the arc of the torque pole, which is half of the radian of the levitation pole. The design method is as follows: determine the inner and outer diameters of the torque core according to the electromagnetic power requirement, and then determine the axial length of the torque core; determine the axial length of the levitation pole according to the inner diameter of the torque core, the arc length of the levitation pole and the given levitation force requirement, Take the longer of the two as the total axial length of the rotor core.
Description
Technical Field
The invention relates to a bearingless switched reluctance motor, in particular to a 12/14 bearingless switched reluctance motor with a novel structure.
Background
The bearingless switch reluctance motor is a novel motor which is researched based on bearingless technology, the rotor pole of the bearingless switch reluctance motor is not wound with windings, and only the suspension pole and the torque pole are provided with control windings, so that the bearingless switch reluctance motor has the characteristics of no friction and abrasion, high efficiency, simple structure and the like, and has the advantages of strong robustness and strong fault tolerance.
The existing 12/8 pole single-winding, double-winding bearingless switched reluctance motor or 8/10 pole bearingless switched reluctance motor is developed on the common switched reluctance motor, and the two structures are used for providing levitation force and torque of a rotor through windings on the same stator pole, so that strong coupling exists between the levitation force and the control of the torque, meanwhile, the torque pole and the levitation pole share or are separated, but the axial lengths of the levitation pole and the torque pole are necessarily the same, the levitation pole and the torque pole are limited in a stator space, and therefore continuous torque and levitation force are generated, and a constraint relationship exists between the torque and the levitation force necessarily. Therefore, the invention provides that the axial lengths of the torque pole and the suspension pole of the motor are independently designed according to the requirements, and the axial length of the rotor is matched with the middle lengths of the suspension pole and the torque pole of the stator, so that the purposes of respectively designing the torque and the suspension force are achieved, the technical bottleneck of the design of the bearingless switch reluctance motor is broken through, and the bearingless switch reluctance motor has the advantages of simple control and easiness in implementation.
Disclosure of Invention
The invention aims to provide a 12/14 bearingless switched reluctance motor with a novel structure, which solves the restriction relation between torque and levitation force in the bearingless switched reluctance motor, independently designs the torque and the levitation force, and reduces the coupling problem of the torque and the levitation of the switched reluctance motor.
The invention is realized by the following technical scheme:
a12/14 bearingless switch reluctance motor comprises a stator and a rotor which are both of a double-sheet structure, wherein the stator comprises two suspension iron cores (1 and 2), and each of the suspension iron cores (1) and (2) has 4 suspension polesP lx+ 、P ly+ 、P lx- 、P ly- ；P rx+ 、P ry+ 、P rx- 、P ry- ) The two suspended poles are symmetrical, a permanent magnet ring (3) is clamped between the suspended cores (1) and (2), torque cores connected to the suspended cores through magnetism isolating aluminum blocks (11, 12, 13, 14, 15, 16, 17 and 18) are arranged between every two suspended poles in the radial direction, each torque core is provided with two torque poles, and the total number of the torque poles is 16T r1 ~T r8 、T l1 ~T l8 ) The torque pole and the suspension pole are respectively wound with a torque winding (19, 20, 21, 22) and a suspension winding (23), the suspension windings which are opposite in radial direction are connected in series, and the 4 torque pole windings which are opposite in radial direction are connected in series, and direct current is supplied. The described double-sheet type rotors (6, 7) are uniformly arranged with rotor poles (6, 7) outsideR r1 ~R r14 、R l1 ~R l14 ) The arc degree of the rotor pole is consistent with the arc degree of the torque pole, the arc degree of the rotor pole and the arc degree of the torque pole are half of the arc degree of the suspension pole, and air gaps (9 and 10) are arranged between the rotor pole and the torque pole.
Further: the torque pole is [ ]T r1 ~T r8 ；T l1 ~T l8 ) 12.857 DEG, rotor pole [ ]R r1 ~R r14 、R l1 ~R l14 ) 12.857 DEG, suspension poleP lx+ 、P ly+ 、P lx- 、P ly- 、P rx+ 、P ry+ 、P rx- 、P ry- ) Is 25.714 °; when suspending poleP lx+ 、P lx- AndP rx+ 、P rx- and rotor polesR l1 、R l8 AndR r1 、R r8+ when aligned, torque poleT l1 、T l2 AndT r1 、T r2 anticlockwise advanced rotor poleR l2 、R l3 AndR r2、 R r3 6.428 DEG, torque poleT l3 、T l4 AndT r3 、T r4 counter-clockwise lag rotor poleR l6 、R l7 AndR r6、 R r7 6.428 DEG rotor poleR l4 、R l11 AndR r4 、R r11 counter-clockwise hysteresis suspension poleP ly+ 、P ly- AndP ry+ 、P ry- 12.857 °; when the torque poleT l1 、T l2 AndT r1 、T r2 and rotor polesR l1 、R l2 AndR r1、 R r2 when aligned, the rotor polesR l3 、R l10 AndR r3 、R r10 counter-clockwise hysteresis suspension poleP ly+ 、P ly- AndP ry+ 、P ry- 6.428 DEG, torque poleT l3 、T l4 AndT r3 、T r4 counter-clockwise lag rotor poleR l5 、R l6 AndR r5、 R r6 12.857 DEG rotor poleR l7 、R l14 AndR r7、 R r14 counterclockwise advanced suspension poleP lx+ 、P lx- AndP rx+ 、P rx- 6.428°。
the invention also provides a design method of the 12/14 bearingless switch reluctance motor, which comprises the following steps: step 1, rated power according to the design of the motor torque windingPDetermining electromagnetic powerP em ，Wherein the torque winding provides electromagnetic powerP em The formula:
in the middle ofηRated efficiency of the motor;
step 2: according to electromagnetic powerP em Obtaining the outer diameter of the rotor coreD ro Wherein:
in the middle ofk i The current coefficient of the winding is generally 0.48-0.51; b is a magnetic load; a is an electrical load;k m is a square wave current coefficient, and is characterized by that,k m is less than or equal to 1; n is the motor rotation speed;λthe motor is of a slender ratio;
step 3: according to the outer diameter of the rotor coreD ro Obtaining the outer diameter of the torque iron coreD so And the outer diameter of the torque coreD si The method comprises the following steps of:
in the middle ofgIs an air gap;
step 4: obtaining the axial total length of the torque iron corel T The method comprises the following steps:
；
step 5: according to the levitation forceF x The method comprises the following steps:
in the middle ofΦ lx+ AndΦ lx- respectively isP lx+ AndP lx- the resultant magnetic flux at the location(s),μ 0 is the magnetic permeability of the vacuum and is equal to the magnetic permeability of the vacuum,Sis the magnetic pole area;
to obtain the axial total length of the suspension polel F ：
In the middle ofSIs the area of the magnetic pole,βis a suspension pole radian;
step 6: taking outl T Andl F the larger of these is the axial length of the rotor core.
Compared with the prior art, the invention has the following advantages:
1. compared with the traditional bearingless switch reluctance motor, the design independently designs the axial lengths of the torque part and the suspension part, and solves the problem that the traditional bearingless switch reluctance motor has a restriction relation between the torque and the suspension force caused by the same axial length of the torque iron core and the suspension iron core;
2. compared with the traditional bearingless switch reluctance motor, the winding needs to control the suspension and rotation of the rotor at the same time, but the suspension of the rotor is controlled by the suspension winding in two radial directions of the motor, the rotation of the rotor is controlled by the torque winding, and the suspension and the rotation are separately controlled, so that the control difficulty is reduced.
Drawings
Fig. 1 is a cross-sectional view of the torque pole axial structure of the present invention.
FIG. 2 is a cross-sectional view of the axial structure and magnetic flux of the suspension pole of the present invention.
Fig. 3 is a schematic view of a levitation core, a rotor core structure and a magnetic flux of the present invention.
Fig. 4 is a schematic view of the opposing faces of the levitated core, rotor core structure and magnetic flux of fig. 3.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention is realized by the following technical scheme:
a12/14 bearingless switch reluctance motor with a new structure comprises a stator and a rotor which are both in a double-piece structure. The method is characterized in that: the stator comprises 2 suspension iron cores (1, 2), wherein each of the suspension iron cores (1) and (2) has 4 suspension polesP lx+ 、P ly+ 、P lx- 、P ly- ；P rx+ 、P ry+ 、P rx- 、P ry- ) The two suspension poles are symmetrical, a permanent magnet ring (3) is clamped between the suspension cores (1) and (2), a torque iron core connected to the suspension cores through magnetism isolating aluminum blocks (11, 12, 13, 14, 15, 16, 17 and 18) is arranged between every two suspension poles in the radial direction, two torque poles are arranged on each torque iron core, and the total number of the torque poles is 16T r1 ~T r8 、T l1 ~T l8 ) The torque pole and the levitation pole are respectively wound with a DC power supply torque winding (19, 20, 21, 22) and a levitation winding (23). Rotor poles are uniformly arranged outside the described rotors (6, 7)R r1 ~R r14 、R l1 ~R l14 ) The arc degree of the rotor pole is consistent with the arc degree of the torque pole, and the arc degree of the rotor pole and the arc degree of the torque pole are half of the arc degree of the suspension pole. An air gap (9, 10) is arranged between the rotor pole and the torque pole.
The torque pole is [ ]T r1 ~T r8 ；T l1 ~T l8 ) 12.857 DEG, suspension poleP lx+ 、P ly+ 、P lx- 、P ly- 、P rx+ 、P ry+ 、P rx- 、P ry- ) Is 25.714 DEG, rotor pole [ ]R r1 ~R r14 、R l1 ~R l14 ) 12.857 °; when suspending poleP lx+ 、P lx- AndP rx+ 、P rx- and rotor polesR l1 、R l8 AndR r1 、R r8+ when aligned, torque poleT l1 、T l2 AndT r1 、T r2 anticlockwise advanced rotor poleR l2 、R l3 AndR r2、 R r3 6.428 DEG, torque poleT l3 、T l4 AndT r3 、T r4 counter-clockwise lag rotor poleR l6 、R l7 AndR r6、 R r7 6.428 DEG rotor poleR l4 、R l11 AndR r4 、R r11 counter-clockwise hysteresis suspension poleP ly+ 、P ly- AndP ry+ 、P ry- 12.857 °; when the torque poleT l1 、T l2 AndT r1 、T r2 and rotor polesR l1 、R l2 AndR r1、 R r2 when aligned, the rotor polesR l3 、R l10 AndR r3 、R r10 counter-clockwise hysteresis suspension poleP ly+ 、P ly- AndP ry+ 、P ry- 6.428 DEG, torque poleT l3 、T l4 AndT r3 、T r4 counter-clockwise lag rotor poleR l5 、R l6 AndR r5、 R r6 12.857 DEG rotor poleR l7 、R l14 AndR r7、 R r14 counterclockwise advanced suspension poleP lx+ 、P lx- AndP rx+ 、P rx- 6.428°。
suspension poleP lx+ AndP lx- 、P ly+ andP ly- 、P rx+ andP rx- 、P ry+ andP ry- the upper suspension winding is powered by direct current and connected in series in the same direction; each pair of torque polesT l1 、T l2 AndT r1 、T r2 ，T l5 、T l6 andT r5 、T r6 up-wound reverse series torque windings with opposing torque polesT l1 、T l2 AndT l5 、T l6 ，T r1 、T r2 andT r5 、T r6 the upper windings are connected in series and are all supplied with direct current.
The torque winding is energized to produce a torque flux (26) which is routed: torque poleT l1 ) Starting from, the rotor pole passes through radial air gaps (9) and then sequentially passes through the rotor poleR l2 ) And rotor pole [ ]R l3 ) Finally return to the torque poleT l2 ) Forming a closed loop. The magnetic circuit has a short magnetic circuit structure, so that the core loss can be reduced. The permanent magnet ring (3) provides a bias magnetic flux (24), and a magnetic circuit of the bias magnetic flux (24) is as follows: the N pole of the permanent magnet ring (3) starts from the suspension iron core (1), passes through the radial working air gap (9), passes through the rotors (6 and 7) again, passes through the radial working air gap (10), passes through the suspension iron core (2), finally reaches the S pole of the permanent magnet ring (3) to form a closed loop, and the torque magnetic flux is of a short magnetic circuit structure, so that the core loss can be reduced.
The control magnetic flux (25) is generated by levitation windings from levitation polesP ly+ Starting from, passing through radial working gasGap, passing through rotor poleR l4 Through the rotor core and then throughR l12 Through radial working air gap, past suspended poleP ly- Finally reaching the suspension pole through the suspension iron coreP ly+ A closed loop is formed. From the paths of the torque flux and the control flux, it can be seen that the torque flux and the levitation flux are independent of each other, so that the torque and the levitation can be naturally decoupled.
Bias magnetic circuit: starting from the N pole of the permanent magnet ring, the permanent magnet ring passes through the left suspension iron core (1), passes through the left radial working air gap, passes through the rotor poles (6 and 7), passes through the right radial working air gap, passes through the right suspension iron core (2), and finally reaches the S pole of the permanent magnet ring to form a closed loop.
Principle of rotation: taking the left side as an example, a torque poleT l1 、T l2 、T l5 、T l6 Energizing rotor poleR l2 、R l3 、R l9 、R l10 Will rotate and torque pole under the action of magnetic resistance force generated by torque magnetic flux (26)T l1 、T l2 、T l5 、T l6 Alignment. Follow-up torque poleT l3 、T l4 、T l7 、T l8 Winding electrifies, rotor poleR l5 、R l6 、R l12 、R l13 Under the action of reluctance force generated by torque magnetic flux, the rotating and torque polesT l3 、T l4 、T l7 、T l8 Alignment. The torque poles are sequentially electrified, so that the rotor can continuously rotate.
Compared with the traditional bearingless switch reluctance motor, the design independently designs the axial length of the torque part and the axial length of the suspension part, and solves the problem that the traditional bearingless switch reluctance motor has a restriction relationship between the torque and the suspension force caused by the same axial length of the torque iron core and the suspension iron core.
Compared with the traditional bearingless switch reluctance motor, the winding needs to control the suspension and rotation of the rotor at the same time, but the suspension of the rotor is controlled by the suspension winding in two radial directions of the motor, the rotation of the rotor is controlled by the torque winding, and the suspension and the rotation are separately controlled, so that the control difficulty is reduced. The foregoing embodiments are merely illustrative of the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (3)
1. The 12/14 bearingless switch reluctance motor comprises a stator and a rotor which are of a double-piece structure, and is characterized in that: the stator comprises 2 suspension iron cores (1, 2), wherein each of the suspension iron cores (1) and (2) has 4 suspension polesP lx+ 、P ly+ 、P lx- 、P ly- ；P rx+ 、P ry+ 、P rx- 、P ry- ) The two suspended poles are symmetrical, a permanent magnet ring (3) is clamped between the suspended cores (1) and (2), torque cores connected to the suspended cores through magnetism isolating aluminum blocks (11, 12, 13, 14, 15, 16, 17 and 18) are arranged between every two suspended poles in the radial direction, each torque core is provided with two torque poles, and the total number of the torque poles is 16T r1 ~T r8 、T l1 ~T l8 ) The torque pole and the suspension pole are respectively wound with a torque winding (19, 20, 21, 22) and a suspension winding (23), the suspension windings which are opposite in radial direction are connected in series, and the 4 torque pole windings which are opposite in radial direction are connected in series, and direct current is supplied to the torque pole windings; the described double-sheet type rotors (6, 7) are uniformly arranged with rotor poles (6, 7) outsideR r1 ~R r14 、R l1 ~R l14 ) The arc degree of the rotor pole is consistent with the arc degree of the torque pole, the arc degree of the rotor pole and the arc degree of the torque pole are half of the arc degree of the suspension pole, and air gaps (9 and 10) are arranged between the rotor pole and the torque pole.
2. A 12/14 bearingless switched reluctance motor as set forth in claim 1, wherein: the torque pole is [ ]T r1 ~T r8 ；T l1 ~T l8 ) 12.857 DEG, rotor pole [ ]R r1 ~R r14 、R l1 ~R l14 ) 12.857 DEG, suspension poleP lx+ 、P ly+ 、P lx- 、P ly- 、P rx+ 、P ry+ 、P rx- 、P ry- ) Is 25.714 °; when suspending poleP lx+ 、P lx- AndP rx+ 、P rx- and rotor polesR l1 、R l8 AndR r1 、R r8+ when aligned, torque poleT l1 、T l2 AndT r1 、T r2 anticlockwise advanced rotor poleR l2 、R l3 AndR r2、 R r3 6.428 DEG, torque poleT l3 、T l4 AndT r3 、T r4 counter-clockwise lag rotor poleR l6 、R l7 AndR r6、 R r7 6.428 DEG rotor poleR l4 、R l11 AndR r4 、R r11 counter-clockwise hysteresis suspension poleP ly+ 、P ly- AndP ry+ 、P ry- 12.857 °; when the torque poleT l1 、T l2 AndT r1 、T r2 and rotor polesR l1 、R l2 AndR r1、 R r2 when aligned, the rotor polesR l3 、R l10 AndR r3 、R r10 counter-clockwise hysteresis suspension poleP ly+ 、P ly- AndP ry+ 、P ry- 6.428 DEG, torque poleT l3 、T l4 AndT r3 、T r4 counter-clockwise lag rotor poleR l5 、R l6 AndR r5、 R r6 12.857 DEG rotor poleR l7 、R l14 AndR r7、 R r14 counterclockwise advanced suspension poleP lx+ 、P lx- AndP rx+ 、P rx- 6.428°。
3. a bearingless switched reluctance motor according to any one of claims 1 to 2, characterized in that: comprises the following steps of 1, designing rated power according to the torque winding of the motorPDetermining electromagnetic powerP em ，Wherein the torque winding provides electromagnetic powerP em The formula:
in the middle ofηRated efficiency of the motor;
step 2: according to electromagnetic powerP em Obtaining the outer diameter of the rotor coreD ro Wherein:
in the middle ofk i The current coefficient of the winding is generally 0.48-0.51; b is a magnetic load; a is an electrical load;k m is a square wave current coefficient, and is characterized by that,k m is less than or equal to 1; n is the motor rotation speed;λthe motor is of a slender ratio;
step 3: according to the outer diameter of the rotor coreD ro Obtaining the outer diameter of the torque iron coreD so And the outer diameter of the torque coreD si The method comprises the following steps of:
in the middle ofgIs an air gap;
step 4: obtaining the axial total length of the torque iron corel T The method comprises the following steps:
；
step 5: according to the levitation forceF x The method comprises the following steps:
in the middle ofΦ lx+ AndΦ lx- respectively isP lx+ AndP lx- the resultant magnetic flux at the location(s),μ 0 is the magnetic permeability of the vacuum and is equal to the magnetic permeability of the vacuum,Sis the magnetic pole area;
to obtain the axial total length of the suspension polel F ：
In the middle ofSIs the area of the magnetic pole,βis a suspension pole radian;
step 6: taking outl T Andl F the larger of these is the axial length of the rotor core.
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|---|---|---|---|---|
| JP2000184655A (en) * | 1998-12-14 | 2000-06-30 | Sankyo Seiki Mfg Co Ltd | Magnetically levitating motor |
| CN102306995A (en) * | 2011-08-26 | 2012-01-04 | 北京航空航天大学 | Permanent magnet biased bearingless switched reluctance motor |
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Application publication date: 20230815 Assignee: HUAIAN TIANDA MEDICAL INSTRUMENTS Co.,Ltd. Assignor: HUAIYIN INSTITUTE OF TECHNOLOGY Contract record no.: X2024980037471 Denomination of invention: Design Method of a 12/14 Bearingless Switched Reluctance Motor Granted publication date: 20240723 License type: Common License Record date: 20241217 |