CN212012439U - Gear cutting type permanent magnet linear motor - Google Patents
Gear cutting type permanent magnet linear motor Download PDFInfo
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- CN212012439U CN212012439U CN202020922636.2U CN202020922636U CN212012439U CN 212012439 U CN212012439 U CN 212012439U CN 202020922636 U CN202020922636 U CN 202020922636U CN 212012439 U CN212012439 U CN 212012439U
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- 230000002146 bilateral effect Effects 0.000 claims abstract description 33
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000004804 winding Methods 0.000 claims abstract description 15
- 239000010410 layer Substances 0.000 claims description 62
- 210000004283 incisor Anatomy 0.000 claims description 20
- 239000002356 single layer Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 19
- 230000000295 complement effect Effects 0.000 abstract description 7
- 210000003781 tooth socket Anatomy 0.000 description 16
- 230000005389 magnetism Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 10
- 230000003313 weakening effect Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- 238000002955 isolation Methods 0.000 description 4
- 230000036346 tooth eruption Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Abstract
The utility model discloses a gear cutting type permanent magnet linear motor, which comprises a stator and a rotor, wherein an air gap is arranged between the stator and the rotor; the stator comprises an iron core, a plurality of stator teeth are arranged on the iron core, armature windings are arranged between adjacent stator teeth, and the armature windings are fastened on the outer side of the iron core; the edges of the stator teeth are provided with tooth cutting structures; the width of the edge of the stator tooth parallel to the air gap direction is smaller than the width of the middle section of the stator tooth. The utility model discloses a structure to permanent magnet linear electric motor improves, change motor stator tooth tip shape, form the gear cutting structure at motor stator tooth tip, this kind of gear cutting type structural design is applicable to bilateral permanent magnet linear electric motor and unilateral permanent magnet linear electric motor, the tooth's socket force wave form dislocation that makes the inside and outside stator of bilateral motor or the stator both ends of unilateral motor produce, the two wave form is complementary, thereby reach the effect that weakens the tooth's socket force fluctuation, permanent magnet linear electric motor's controllability and efficiency have been improved greatly.
Description
Technical Field
The utility model belongs to the technical field of permanent magnet linear motor, especially, relate to a gear cutting type permanent magnet linear motor.
Background
A linear motor is a transmission device that directly converts electric energy into mechanical energy for linear motion without any intermediate conversion mechanism. The rotary motor can be seen as being formed by cutting a rotary motor in the radial direction and expanding the rotary motor into a plane.
The linear motor can realize linear driving in an industrial automation system, cancels traditional transmission mechanisms such as balls and lead screws, directly realizes linear driving, and has the advantages of simple structure, high response speed and high precision.
The permanent magnet linear motor is a large type of linear motor, adopts permanent magnets to replace excitation magnetic poles, can simplify the structure, reduces the copper consumption and reduces the volume and the weight of the motor. The permanent magnet synchronous linear motor adopting the neodymium iron boron magnet or the rare earth permanent magnet material with high magnetic energy product, high remanence and strong coercive force has the advantages of high reliability and high efficiency, and has more advantages than an induction linear motor, a stepping linear motor and the like in the aspects of thrust, speed, positioning accuracy and the like. Meanwhile, compared with a common permanent magnet linear motor, the bilateral permanent magnet linear motor has higher power density and space utilization rate.
Nevertheless this application utility model people in the in-process of realizing utility model technical scheme in this application embodiment, discover that current bilateral permanent magnet linear electric motor exists following technical problem at least:
in practice, the large thrust fluctuation of the permanent magnet linear motor can cause poor controllability and low efficiency of the motor. The utility model discloses the people research discovery, the tooth's socket force that arouses by the cogging is one of the leading to the undulant leading cause of thrust.
Therefore, how to overcome the technical problems, weaken the cogging force fluctuation of the motor and improve the controllability and efficiency of the permanent magnet linear motor is a problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application solves the technical problems that the controllability of a motor is poor and the efficiency is low due to the fact that the large thrust fluctuation of a permanent magnet linear motor in the prior art is solved, and the permanent magnet linear motor with a new tooth cutting type structure can greatly weaken the tooth socket force fluctuation of the motor and improve the controllability and the efficiency of the permanent magnet linear motor.
The embodiment of the application provides a gear-cutting type permanent magnet linear motor which comprises a stator and a rotor, wherein an air gap is formed between the stator and the rotor;
the stator comprises an iron core, a plurality of stator teeth are arranged on the iron core, armature windings are arranged between adjacent stator teeth, and the armature windings are fastened on the outer side of the iron core;
the edges of the stator teeth are provided with tooth cutting structures;
the width of the edge of the stator tooth parallel to the air gap direction is smaller than the width of the middle section of the stator tooth.
Preferably, the width of the edge of the stator tooth parallel to the air gap direction is greater than or equal to 1/3 of the width of the middle section of the stator tooth.
Preferably, the gear cutting structure is a triangular gear cutting structure or other polygonal gear cutting structures.
Preferably, the gear cutting type permanent magnet linear motor is a gear cutting type bilateral permanent magnet linear motor;
the stator of the gear-cutting type bilateral permanent magnet linear motor is of an inner-layer structure and an outer-layer structure and consists of an inner stator and an outer stator; the iron core of the inner stator is provided with a plurality of inner layer stator teeth, the iron core of the outer stator is provided with a plurality of outer layer stator teeth, and the edges of the inner layer stator teeth and the outer layer stator teeth are both provided with a tooth cutting structure;
the directions of the gear cutting structures on the inner layer stator teeth and the outer layer stator teeth are opposite.
More preferably, the end part of the inner layer stator tooth is formed by cutting off the upper corner of a triangular structure in a rectangular shape, the end part of the inner layer stator tooth is in a right-angle trapezoidal structure, and the width of the edge of the end part of the inner layer stator tooth parallel to the air gap direction is smaller than the width of the middle section of the inner layer stator tooth;
the outer layer stator tooth end part is formed by cutting off the lower corner of a triangular structure in a rectangular mode, and the cut tooth end part is in a right-angled trapezoid structure; the width of the edge of the end part of the outer layer stator tooth parallel to the air gap direction is smaller than the width of the middle section of the outer layer stator tooth;
and b is the length of a right-angle side of the triangle parallel to the air gap direction, and s is the width of the middle section of the stator tooth, so that b is more than 0 and less than 0.7 s.
More preferably, the tooth end part of the inner layer stator is formed by cutting off the lower corner of a triangular structure in a rectangular shape, and the cut-off tooth end part is in a right-angled trapezoidal structure; the width of the edge of the end part of the inner layer stator tooth parallel to the air gap direction is smaller than the width of the middle section of the inner layer stator tooth;
the end part of the outer layer stator tooth is formed by cutting off the upper corner of a triangular structure in a rectangular shape, and the cut-off end part of the tooth is in a right-angled trapezoid structure; the width of the edge of the end part of the outer layer stator tooth parallel to the air gap direction is smaller than the width of the middle section of the outer layer stator tooth;
and b is the length of a right-angle side of the triangle parallel to the air gap direction, and s is the width of the middle section of the stator tooth, so that b is more than 0 and less than 0.7 s.
Preferably, the tooth cutting structure with opposite directions is arranged at the edges of the inner layer stator teeth and the outer layer stator teeth, so that the tooth socket force generated by the inner stator and the outer stator are staggered in a waveform mode, the waveforms of the inner stator and the outer stator are complementary, and the effect of weakening the tooth socket force fluctuation is achieved.
Preferably, the gear cutting type permanent magnet linear motor is a gear cutting type unilateral permanent magnet linear motor;
the stator of the gear cutting type unilateral cylindrical permanent magnet linear motor is of a single-layer structure, m stator teeth are arranged on an iron core of the stator, and m is a positive integer; stator teeth from one end to the other end of the iron core are arranged according to the numbers 1, 2 and 3 … … m, the (m +1)/2 th stator tooth is defined as a middle tooth, the 1 st to (m-1)/2 th stator teeth are defined as a first group of stator teeth, and the (m +3)/2 th to m th stator teeth are defined as a second group of stator teeth;
the edge of the first group of stator teeth and the edge of the second group of stator teeth are both provided with a gear cutting structure, and the directions of the gear cutting structures on the first group of stator teeth and the second group of stator teeth are opposite.
More preferably, the first group of stator tooth ends are formed by cutting off the upper corner of a triangular structure in a rectangular shape, the first group of stator tooth ends are in a right-angle trapezoidal structure, and the width of the edge of each first group of stator tooth ends parallel to the air gap direction is smaller than the width of the middle section of the corresponding stator tooth;
the end part of the second group of stator teeth is formed by cutting off the lower corner of a triangular structure in a rectangular shape, and the cut-off end part of the teeth is in a right-angled trapezoid structure; the width of the edge of the end part of the second group of stator teeth in the direction parallel to the air gap is smaller than the width of the middle section of the corresponding stator teeth;
and b is the length of a right-angle side of the triangle parallel to the air gap direction, and s is the width of the middle section of the stator tooth, so that b is more than 0 and less than 0.7 s.
More preferably, the first group of stator tooth ends are formed by cutting off lower corners of a triangular structure in a rectangular shape, the first group of stator tooth ends are in a right-angle trapezoidal structure, and the width of the edges of the first group of stator tooth ends parallel to the air gap direction is smaller than the width of the middle section of the corresponding stator tooth;
the end parts of the second group of stator teeth are formed by cutting off the upper corner of a triangular structure in a rectangular shape, and the cut-off tooth end parts are in a right-angled trapezoid structure; the width of the edge of the end part of the second group of stator teeth in the direction parallel to the air gap is smaller than the width of the middle section of the corresponding stator teeth;
and b is the length of a right-angle side of the triangle parallel to the air gap direction, and s is the width of the middle section of the stator tooth, so that b is more than 0 and less than 0.7 s.
Preferably, the tooth cutting structure with opposite directions is arranged at the edges of the first group of stator teeth and the second group of stator teeth, so that the tooth socket force generated at the two ends of the stator is staggered in a wave shape, and the two wave shapes are complementary, thereby weakening the fluctuation effect of the tooth socket force.
Preferably, the stator teeth at the two end edges of the iron core are defined as end teeth, and the width of the end teeth is greater than that of the middle stator teeth.
Further, the width of the end teeth is 1.5 times the width of the middle stator teeth.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. the structure of the permanent magnet linear motor is improved, the shape of the end part of the motor stator tooth is changed, a tooth cutting structure is formed at the end part of the motor stator tooth, and the effect of weakening the tooth socket force fluctuation can be achieved. The gear cutting type structural design is suitable for a bilateral permanent magnet linear motor and a unilateral permanent magnet linear motor.
2. Aiming at the bilateral permanent magnet linear motor, the shapes of the inner layer stator teeth and the outer layer stator teeth of the motor are changed to enable the tooth socket force waveforms generated by the inner stator and the outer stator to be staggered, and the waveforms of the inner stator and the outer stator are complementary, so that the effect of weakening the tooth socket force fluctuation is achieved.
3. Aiming at the unilateral permanent magnet linear motor, the shapes of the end parts of the upper group of stator teeth and the lower group of stator teeth of the motor are respectively changed to enable the internal tooth socket force waveform of the motor to be staggered, and the waveform heights of the upper group of stator teeth and the lower group of stator teeth are complementary, so that the effect of weakening the tooth socket force fluctuation is achieved.
4. The width of the end part of the tooth is reasonably designed, so that the phenomenon that the motor generates serious tooth saturation effect and increases motor thrust fluctuation due to the fact that the end part of the tooth is too thin is avoided.
5. The device has the advantages of simple structure and low cost, has an obvious effect of weakening the cogging force fluctuation, greatly improves the controllability and efficiency of the permanent magnet linear motor, and is suitable for large-scale popularization and use.
Drawings
Fig. 1 is a cross-sectional view of an overall structure of a tangential tooth type double-sided cylindrical permanent magnet linear motor according to a first embodiment of the present disclosure;
fig. 2 is a cross-sectional comparison view of stators of a cogging type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor provided in the first embodiment of the present application; (a) cutting tooth type; (b) a conventional type;
fig. 3 is a schematic diagram of a comparison of tooth socket force waveforms after simulation of the incisor-type bilateral cylindrical permanent magnet linear motor and the conventional bilateral cylindrical permanent magnet linear motor provided in the first embodiment of the present application;
fig. 4 is a cross-sectional view of an overall structure of a notch-type double-sided cylindrical permanent magnet linear motor according to a second embodiment of the present disclosure;
fig. 5 is a cross-sectional comparison view of stators of a notch-type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor provided in the second embodiment of the present application; (a) cutting tooth type; (b) a conventional type;
fig. 6 is a schematic diagram illustrating comparison of tooth socket force waveforms after simulation of the incisor-type bilateral cylindrical permanent magnet linear motor and the conventional bilateral cylindrical permanent magnet linear motor provided in the second embodiment of the present application;
fig. 7 is a cross-sectional view of an overall structure of a tangential tooth type single-sided cylindrical permanent magnet linear motor provided in the third embodiment of the present application;
fig. 8 is a stator cross-sectional comparison diagram of a gear-cutting type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor provided in the third embodiment of the present application; (a) cutting tooth type; (b) a conventional type;
fig. 9 is a schematic diagram of a comparison of tooth space force waveforms after simulation of the incisor-type single-sided cylindrical permanent magnet linear motor and the conventional single-sided cylindrical permanent magnet linear motor provided in the third embodiment of the present application;
fig. 10 is a cross-sectional view of an overall structure of a tangential tooth type single-sided cylindrical permanent magnet linear motor provided in the fourth embodiment of the present application;
fig. 11 is a cross-sectional comparison diagram of stators of a notch type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor provided in the fourth embodiment of the present application; (a) cutting tooth type; (b) a conventional type;
fig. 12 is a schematic diagram of a comparison of tooth space force waveforms after simulation of the incisor-type single-sided cylindrical permanent magnet linear motor and the conventional single-sided cylindrical permanent magnet linear motor provided in the fourth embodiment of the present application.
Detailed Description
The embodiment of the application provides a gear cutting type permanent magnet linear motor, and solves the technical problems that the motor controllability is poor and the efficiency is low due to the fact that the large thrust fluctuation of the permanent magnet linear motor in the prior art.
In order to solve the problem of crosstalk, the technical scheme in the embodiment of the present application has the following general idea:
cogging force caused by cogging is one of the main causes of thrust fluctuation.
If the cogging force fluctuation of the motor can be weakened, the problems can be solved, so that the controllability and the efficiency of the permanent magnet linear motor can be improved.
The structure of the permanent magnet linear motor is improved, the shape of the end part of the motor stator tooth is changed, and a gear cutting structure is formed at the end part of the motor stator tooth. The gear cutting type structural design is suitable for a bilateral permanent magnet linear motor and a unilateral permanent magnet linear motor.
Aiming at the bilateral permanent magnet linear motor, the cutting tooth structures with opposite directions are arranged at the edges of the inner layer stator teeth and the outer layer stator teeth, so that the tooth socket force waveforms generated by the inner stator and the outer stator are staggered, and the waveforms of the inner stator and the outer stator are complementary, thereby achieving the effect of weakening the tooth socket force fluctuation.
Aiming at the unilateral permanent magnet linear motor, the tooth cutting structures with opposite directions are arranged at the edges of the upper group of stator teeth and the lower group of stator teeth, so that the tooth socket force waveforms generated at the two ends of the stator are staggered and complementary, and the effect of weakening the tooth socket force fluctuation is achieved.
In addition, the cut-off part is not too wide, so that the serious tooth saturation effect of the motor and the increase of the thrust fluctuation of the motor caused by the excessively thin end part of the tooth are avoided. And ensuring that the width of the edge of the stator tooth parallel to the air gap direction is more than or equal to 1/3 of the width of the middle section of the stator tooth.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example one
The gear cutting type bilateral permanent magnet linear motor can be specifically divided into a gear cutting type bilateral cylindrical permanent magnet linear motor and a gear cutting type bilateral flat permanent magnet linear motor, and the gear cutting type bilateral cylindrical permanent magnet linear motor is taken as a prototype in the embodiment.
Fig. 1 is a cross-sectional view of an overall structure of a gear-cutting type bilateral cylindrical permanent magnet linear motor provided in an embodiment of the present application, where the gear-cutting type bilateral cylindrical permanent magnet linear motor mainly includes an inner stator 1, an outer stator 2, a mover 3, and an air gap 4.
The primary of the gear-cutting type bilateral cylindrical permanent magnet linear motor is divided into an inner layer structure and an outer layer structure, and the gear-cutting type bilateral cylindrical permanent magnet linear motor is composed of an inner stator 1 and an outer stator 2. The mover 3 is disposed between the inner stator 1 and the outer stator 2, and the inner stator 1 and the outer stator 2 are equally spaced from the mover 3, and the mover 3 axially reciprocates relative to the inner stator 1 and the outer stator 2. Air gaps 4 are respectively arranged between the inner stator 1 and the rotor 3 and between the outer stator 2 and the rotor 3.
The outer stator 2 includes an outer primary core 201, outer stator teeth 202, outer end teeth 204, and an outer armature winding 203. The outer primary iron core 201 is located at the outermost side of the motor and is also of a tubular structure. Outer stator teeth 202 are equidistantly arranged on the inner periphery of the outer primary core 201, and outer stator teeth at the end are defined as outer end teeth 204. The width of the outer end teeth 204 is set to 1.5 times the width of the outer stator teeth 202.
Between adjacent outer stator teeth 202, and between outer end teeth 204 and adjacent outer stator teeth 202, outer armature windings 203 are provided, and the outer armature windings 203 are tightly fixed to the outside of the outer primary core 201.
The inner layer primary iron core 101 and the outer layer primary iron core 201 are both composed of silicon steel sheets.
As an alternative embodiment, the incisor-type bilateral cylindrical permanent magnet linear motor adopts integral-slot concentrated windings.
In an alternative embodiment, the motor is a 12-slot, 13-tooth, 4-pole motor, the cutting teeth are triangular cutting teeth, and the length of a right-angle side of the triangle perpendicular to the air gap direction is set as a, and the length of a right-angle side parallel to the air gap direction is set as b.
As an alternative embodiment, the upper side of the end of the inner stator tooth 102 is cut off in a triangular manner to form a right-angled trapezoid structure at the end of the cut tooth, and correspondingly, the lower side of the end of the outer stator tooth 202 is cut off in a triangular manner to form a right-angled trapezoid structure at the end of the cut tooth, and the width of the end of the cut tooth is smaller than that of the middle section of the uncut tooth.
The side length b of the triangle is slightly smaller than the average tooth width, so that the serious tooth saturation effect of the motor caused by the fact that the end part of the tooth is too thin is avoided, and the thrust fluctuation of the motor is increased.
Let tooth middle section width be s, triangle-shaped length of side a be 0.625 s, length of side b must slightly be less than average tooth width, avoids making the motor produce serious tooth saturation effect because of the tooth end is thin to influence motor thrust stability, and this embodiment is taken b to be 0.625 s.
The rotor mainly comprises a magnet yoke 301, an inner layer magnetism isolating ring 302, an outer layer magnetism isolating ring 303, an inner layer permanent magnet 304 and an outer layer permanent magnet 305. The inner magnetic isolation ring 302 and the inner permanent magnet 304 are both arranged on the inner side of the magnet yoke 301, and the inner magnetic isolation ring 302 and the inner permanent magnet 304 are arranged at intervals. The outer magnetism isolating ring 303 and the outer permanent magnet 305 are both arranged on the outer side of the magnet yoke 301, and the outer magnetism isolating ring 303 and the outer permanent magnet 305 are arranged at intervals. The inner magnetic isolation ring 302 and the outer magnetic isolation ring 303 are disposed on two sides of the magnetic yoke 301, and the inner permanent magnet 304 and the outer permanent magnet 305 are disposed on two sides of the magnetic yoke 301.
The inner permanent magnet 304 and the outer permanent magnet 305 are magnetized in the radial direction, and the magnetizing directions of the permanent magnets at the corresponding positions on the two sides of the magnetic yoke 301 are the same. The inner layer permanent magnet 304 is fixed by the inner layer magnetism isolating ring 302, and the magnetizing directions of the inner layer permanent magnet 304 on the upper side and the lower side of the inner layer magnetism isolating ring 302 are opposite. The outer permanent magnet 305 is fixed by the outer magnetism isolating ring 303, and the magnetizing directions of the outer permanent magnet 305 on the upper side and the lower side of the outer magnetism isolating ring 303 are opposite.
Fig. 2 is a cross-sectional comparison view of stators of a notch-type bilateral cylindrical permanent magnet linear motor and a conventional bilateral cylindrical permanent magnet linear motor provided in an embodiment of the present application. Fig. 3 is a schematic diagram of a comparison of tooth space force waveforms after simulation of the notch type bilateral cylindrical permanent magnet linear motor and the conventional bilateral cylindrical permanent magnet linear motor provided in the embodiment of the present application.
As can be seen from fig. 3, the cogging-force ripple generated by the cogging-type double-sided cylindrical permanent magnet linear motor provided in this embodiment is greatly weakened compared to the conventional double-sided cylindrical permanent magnet linear motor.
Example two
Fig. 4 is a cross-sectional view of the general structure of a notch-type double-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application; this embodiment is substantially the same as the first embodiment, and the differences are only:
the lower side of the end part of the inner layer stator tooth 102 adopts a triangular cutting method to enable the tooth end part to be in a right-angle trapezoidal structure, the upper side of the end part of the corresponding outer layer stator tooth 202 adopts a triangular cutting method to enable the tooth end part to be in a right-angle trapezoidal structure, and the width of the cut tooth end part is smaller than that of the middle section of the tooth which is not cut.
The motor is a 12-slot, 13-tooth and 4-pole motor, the cutting teeth are triangular cutting teeth, the length of a right-angle side of the triangle perpendicular to the air gap direction is a, and the length of a right-angle side parallel to the air gap direction is b.
The side length b of the triangle is slightly smaller than the average tooth width, so that the serious tooth saturation effect of the motor caused by the fact that the end part of the tooth is too thin is avoided, and the thrust fluctuation of the motor is increased.
Let the average tooth width be s, the triangle side length a be 0.3 × s, and the side length b be slightly less than the average tooth width, so as to avoid the motor from generating a severe tooth saturation effect due to the too thin tooth end, thereby affecting the thrust stability of the motor, and in this embodiment, b is 0.3 × s.
Fig. 5 is a cross-sectional comparison view of stators of a notch-type bilateral cylindrical permanent magnet linear motor and a conventional bilateral cylindrical permanent magnet linear motor provided in an embodiment of the present application; fig. 6 is a schematic diagram of a comparison of tooth space force waveforms after simulation of the notch type bilateral cylindrical permanent magnet linear motor and the conventional bilateral cylindrical permanent magnet linear motor provided in the embodiment of the present application.
As can be seen from fig. 6, the cogging-force ripple generated by the cogging-type double-sided cylindrical permanent magnet linear motor provided in this embodiment is greatly weakened compared to the conventional double-sided cylindrical permanent magnet linear motor.
As an alternative embodiment, the triangular tooth cutting method can be analogized to the polygonal tooth cutting, and the cogging force fluctuation can be weakened to some extent.
EXAMPLE III
The single-sided permanent magnet linear motor of incisor specifically can be divided into a single-sided cylindrical permanent magnet linear motor of incisor and a single-sided flat permanent magnet linear motor of incisor, and the single-sided cylindrical permanent magnet linear motor of incisor is used as a prototype in the embodiment.
Fig. 7 is a cross-sectional view of an overall structure of a gear-cutting type single-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application, where the gear-cutting type single-sided cylindrical permanent magnet linear motor includes a layer of stator 5, a rotor 6, and an air gap 7.
The mover 6 is disposed outside the stator 5, and an air gap 7 is provided between the mover 6 and the stator 5.
The mover 6 includes a layer of permanent magnets 603, a layer of magnetism isolating rings 602, and a yoke 601. Only one side of the magnetic yoke 601 corresponding to the stator 5 is provided with a permanent magnet 603 and a magnetism isolating ring 602, and the permanent magnet 603 and the magnetism isolating ring 602 are arranged at intervals.
The stator 5 is provided with m teeth, and m is a positive integer. From top to bottom, (m +1)/2 th teeth are defined as middle teeth 503, (1 to (m-1)/2 th teeth are defined as upper group stator teeth 502, and (m +3)/2 to m th teeth are defined as lower group stator teeth 501.
The upper group of stator teeth 502 and the lower group of stator teeth 501 are respectively of a triangular tooth cutting structure, and the length of a right-angle side of a triangle perpendicular to the air gap direction is a, and the length of a right-angle side parallel to the air gap direction is b.
In an alternative embodiment, the upper side of the end of the upper set of stator teeth 502 is cut off in a triangular manner to form a right trapezoid structure, the lower side of the end of the lower set of stator teeth 501 is cut off in a triangular manner to form a right trapezoid structure, and the width of the cut end of the tooth is smaller than that of the middle section of the tooth which is not cut off.
Let the average tooth width be s, the triangle side length a be 0.625 s, the side length b must be slightly less than the average tooth width, avoid causing the motor to produce serious tooth saturation effect because of the tooth tip is too thin, increase motor thrust fluctuation, this embodiment is taken b to be 0.625 s.
Fig. 8 is a cross-sectional comparison view of stators of a notch type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application; fig. 9 is a schematic diagram of a tooth space force waveform comparison after simulation of the tangential single-sided cylindrical permanent magnet linear motor and the conventional single-sided cylindrical permanent magnet linear motor provided in the embodiment of the present application.
As can be seen from fig. 9, by comparing the cogging force ripple of the notch type single-sided cylindrical permanent magnet linear motor with that of the conventional single-sided cylindrical permanent magnet linear motor, the cogging force ripple of the notch type single-sided cylindrical permanent magnet linear motor is greatly weakened.
Example four
Fig. 10 is a cross-sectional view of the general structure of a tangential tooth type single-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application, which is substantially the same as the third embodiment except that:
the lower side of the end part of the upper group of stator teeth 502 adopts a triangular cutting method to make the end part of the teeth in a right-angle trapezoid structure, the upper side of the end part of the lower group of stator teeth 501 adopts a triangular cutting method to make the end part of the teeth in a right-angle trapezoid structure, and the width of the cut end part of the teeth is smaller than that of the middle section of the teeth which are not cut.
Let the average tooth width be s, triangle side length a be 0.5 × s, side length b must slightly be less than average tooth width, avoid producing serious tooth saturation effect, increasing motor thrust fluctuation because of the tooth tip is thin, this embodiment is taken b to be 0.5 × s.
Fig. 11 is a cross-sectional comparison view of stators of a notch type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application; fig. 12 is a schematic diagram of a tooth space force waveform comparison after simulation of the tangential single-sided cylindrical permanent magnet linear motor and the conventional single-sided cylindrical permanent magnet linear motor provided in the embodiment of the present application.
As can be seen from fig. 12, by comparing the cogging torque ripple of the notch type single-sided cylindrical permanent magnet linear motor with that of the conventional single-sided cylindrical permanent magnet linear motor, the cogging torque ripple of the notch type single-sided cylindrical permanent magnet linear motor is greatly weakened.
In an alternative embodiment, the tooth cutting method of the tooth cutting type unilateral permanent magnet linear motor can achieve the effect of weakening the cogging force fluctuation by comparing a triangular tooth cutting with a polygonal tooth cutting.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be termed a second element, and, similarly, a second element may be termed a first element, without departing from the scope of example embodiments.
The terms of orientation of up, down, left, right, front, back, top, bottom, and the like referred to or may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed correspondingly according to the position and the use state of the device. Therefore, these and other directional terms should not be construed as limiting terms.
While the foregoing is directed to the preferred embodiment of the present application, and not to the limiting thereof in any way and any way, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Those skilled in the art can make various changes, modifications and equivalent arrangements to those skilled in the art without departing from the spirit and scope of the present application; moreover, any equivalent alterations, modifications and variations of the above-described embodiments according to the spirit and techniques of this application are intended to be within the scope of the claims of this application.
Claims (10)
1. A tooth-cutting type permanent magnet linear motor is characterized by comprising a stator and a rotor, wherein an air gap is arranged between the stator and the rotor;
the stator comprises an iron core, a plurality of stator teeth are arranged on the iron core, armature windings are arranged between adjacent stator teeth, and the armature windings are fastened on the outer side of the iron core;
the edges of the stator teeth are provided with tooth cutting structures;
the width of the edge of the stator tooth parallel to the air gap direction is smaller than the width of the middle section of the stator tooth.
2. The incisor type permanent magnet linear motor of claim 1 wherein the incisor structure is a triangular incisor structure or other polygonal incisor structure.
3. The incisor type permanent magnet linear motor of claim 1 wherein the width of the stator teeth edges parallel to the air gap direction is greater than or equal to 1/3 of the width of the stator teeth middle segment.
4. The incisor type permanent magnet linear motor of claim 1 wherein the incisor type permanent magnet linear motor is a incisor type bilateral permanent magnet linear motor;
the stator of the gear-cutting type bilateral permanent magnet linear motor is of an inner-layer structure and an outer-layer structure and consists of an inner stator and an outer stator; the iron core of the inner stator is provided with a plurality of inner layer stator teeth, the iron core of the outer stator is provided with a plurality of outer layer stator teeth, and the edges of the inner layer stator teeth and the outer layer stator teeth are both provided with a tooth cutting structure;
the directions of the gear cutting structures on the inner layer stator teeth and the outer layer stator teeth are opposite.
5. The incisor type permanent magnet linear motor of claim 4 wherein the inner stator teeth end is rectangular cut from the upper corner of a triangular structure, the inner stator teeth end is right trapezoid shaped, the width of the edge of the inner stator teeth end parallel to the air gap direction is less than the width of the middle section of the inner stator teeth;
the outer layer stator tooth end part is formed by cutting off the lower corner of a triangular structure in a rectangular mode, and the cut tooth end part is in a right-angled trapezoid structure; the width of the edge of the end part of the outer layer stator tooth parallel to the air gap direction is smaller than the width of the middle section of the outer layer stator tooth;
and b is the length of a right-angle side of the triangle parallel to the air gap direction, and s is the width of the middle section of the stator tooth, so that b is more than 0 and less than 0.7 s.
6. The incisor type permanent magnet linear motor according to claim 4 wherein the inner stator teeth end is formed by rectangular cutting of the lower corner of a triangular structure, and the cut teeth end is in a right trapezoid structure; the width of the edge of the end part of the inner layer stator tooth parallel to the air gap direction is smaller than the width of the middle section of the inner layer stator tooth;
the end part of the outer layer stator tooth is formed by cutting off the upper corner of a triangular structure in a rectangular shape, and the cut-off end part of the tooth is in a right-angled trapezoid structure; the width of the edge of the end part of the outer layer stator tooth parallel to the air gap direction is smaller than the width of the middle section of the outer layer stator tooth.
7. The incisor permanent magnet linear motor of claim 1 wherein the incisor permanent magnet linear motor is a incisor single-sided permanent magnet linear motor;
the stator of the gear cutting type unilateral cylindrical permanent magnet linear motor is of a single-layer structure, m stator teeth are arranged on an iron core of the stator, and m is a positive integer; stator teeth from one end to the other end of the iron core are arranged according to the numbers 1, 2 and 3 … … m, the (m +1)/2 th stator tooth is defined as a middle tooth, the 1 st to (m-1)/2 th stator teeth are defined as a first group of stator teeth, and the (m +3)/2 th to m th stator teeth are defined as a second group of stator teeth;
the edge of the first group of stator teeth and the edge of the second group of stator teeth are both provided with a gear cutting structure, and the directions of the gear cutting structures on the first group of stator teeth and the second group of stator teeth are opposite.
8. The incisor type permanent magnet linear motor of claim 7 wherein the first set of stator tooth tips are formed by rectangular cutting of the upper corners of a triangular structure, the first set of stator tooth tips are in a right angle trapezoidal structure, and the width of the edges of the first set of stator tooth tips parallel to the air gap direction is less than the width of the corresponding stator tooth middle segments;
the end part of the second group of stator teeth is formed by cutting off the lower corner of a triangular structure in a rectangular shape, and the cut-off end part of the teeth is in a right-angled trapezoid structure; the width of the edge of the end part of the second group of stator teeth in the direction parallel to the air gap is smaller than the width of the middle section of the corresponding stator teeth;
and b is the length of a right-angle side of the triangle parallel to the air gap direction, and s is the width of the middle section of the stator tooth, so that b is more than 0 and less than 0.7 s.
9. The incisor type permanent magnet linear motor of claim 7 wherein the first set of stator tooth tips are formed by rectangular cutting of the lower corners of a triangular structure, the first set of stator tooth tips are in a right trapezoid structure, and the width of the edges of the first set of stator tooth tips parallel to the air gap direction is smaller than the width of the middle segments of the corresponding stator teeth;
the end parts of the second group of stator teeth are formed by cutting off the upper corner of a triangular structure in a rectangular shape, and the cut-off tooth end parts are in a right-angled trapezoid structure; the width of the edge of the end part of the second group of stator teeth in the direction parallel to the air gap is smaller than the width of the middle section of the corresponding stator teeth;
and b is the length of a right-angle side of the triangle parallel to the air gap direction, and s is the width of the middle section of the stator tooth, so that b is more than 0 and less than 0.7 s.
10. The incisor type permanent magnet linear motor of claim 1 wherein the stator teeth at the two end edges of the core define end teeth having a width greater than the width of the middle stator teeth.
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| CN202020922636.2U CN212012439U (en) | 2020-05-27 | 2020-05-27 | Gear cutting type permanent magnet linear motor |
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| CN202020922636.2U CN212012439U (en) | 2020-05-27 | 2020-05-27 | Gear cutting type permanent magnet linear motor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4372972A1 (en) * | 2022-11-18 | 2024-05-22 | Schneider Electric Industries SAS | Linear motor for a transport system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4372972A1 (en) * | 2022-11-18 | 2024-05-22 | Schneider Electric Industries SAS | Linear motor for a transport system |
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