CN111525772B - A tooth-cutting permanent magnet linear motor - Google Patents
A tooth-cutting permanent magnet linear motor Download PDFInfo
- Publication number
- CN111525772B CN111525772B CN202010463406.9A CN202010463406A CN111525772B CN 111525772 B CN111525772 B CN 111525772B CN 202010463406 A CN202010463406 A CN 202010463406A CN 111525772 B CN111525772 B CN 111525772B
- Authority
- CN
- China
- Prior art keywords
- tooth
- stator
- permanent magnet
- cutting
- stator teeth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
-
- 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
- H02K1/14—Stator cores with salient poles
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Linear Motors (AREA)
Abstract
本发明公开了一种切齿型永磁直线电机，包括定子和动子，所述定子与所述动子之间设有气隙；所述定子包括铁心，所述铁心上设有若干定子齿，相邻所述定子齿之间设有电枢绕组，所述电枢绕组紧固于所述铁心外侧；所述定子齿的边沿设有切齿结构；所述定子齿的边沿平行于所述气隙方向的宽度小于所述定子齿中间段的宽度。本发明通过对永磁直线电机的结构进行改进，改变电机定子齿端部形状，在电机定子齿端部形成切齿结构，这种切齿型结构设计适用于双边永磁直线电机以及单边永磁直线电机，使双边电机的内外定子或单边电机的定子两端产生的齿槽力波形错位，二者波形互补，从而达到削弱齿槽力波动的效果，大大提高了永磁直线电机的可控性和效率。
The present invention discloses a tooth-cutting permanent magnet linear motor, comprising a stator and a mover, wherein an air gap is provided between the stator and the mover; the stator comprises an iron core, wherein a plurality of stator teeth are provided on the iron core, and an armature winding is provided between adjacent stator teeth, wherein the armature winding is fastened to the outer side of the iron core; a tooth-cutting structure is provided on the edge of the stator teeth; and the width of the edge of the stator teeth parallel to the air gap direction is smaller than the width of the middle section of the stator teeth. The present invention improves the structure of the permanent magnet linear motor, changes the shape of the end of the motor stator teeth, and forms a tooth-cutting structure at the end of the motor stator teeth. This tooth-cutting structure design is suitable for bilateral permanent magnet linear motors and unilateral permanent magnet linear motors, so that the cogging force waveforms generated by the inner and outer stators of the bilateral motor or the two ends of the stator of the unilateral motor are staggered, and the waveforms of the two complement each other, thereby achieving the effect of weakening the cogging force fluctuation, and greatly improving the controllability and efficiency of the permanent magnet linear motor.
Description
Technical Field
The invention belongs to the technical field of permanent magnet linear motors, and particularly relates to a tooth-cutting permanent magnet linear motor.
Background
A linear motor is a transmission device that converts electrical energy directly into linear motion mechanical energy without any intermediate conversion mechanism. It can be seen as a rotary electric machine which is radially split and formed by generating a plane.
The linear motor can realize linear driving in an industrial automation system, a traditional ball, a screw and other transmission mechanisms are omitted, and the linear driving is directly realized, so that the linear motor has the advantages of simple structure, high response speed and high precision.
The permanent magnet linear motor is a large type of linear motor, and permanent magnets are adopted to replace exciting magnetic poles, so that the structure can be simplified, the copper consumption can be reduced, and the volume and the weight of the motor can be reduced. 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 coercivity has the advantages of high reliability and high efficiency, and has larger advantages in the aspects of thrust, speed, positioning accuracy and the like than induction linear motors, stepping linear motors and the like. Meanwhile, compared with a common permanent magnet linear motor, the double-sided permanent magnet linear motor has higher power density and space utilization rate.
However, in the process of implementing the technical scheme in the embodiment of the application, the inventor discovers that the existing double-sided permanent magnet linear motor at least has the following technical problems:
In practice, the large thrust fluctuation of the permanent magnet linear motor can cause poor motor controllability and low efficiency. The present inventors have found that cogging force due to cogging is one of the main causes of thrust fluctuation.
Therefore, how to overcome the technical problems, weaken the cogging force fluctuation of the motor, and improve the controllability and the efficiency of the permanent magnet linear motor is a problem which needs to be solved at present.
Disclosure of Invention
The embodiment of the application solves the technical problems of poor motor controllability and low efficiency caused by larger thrust fluctuation of the permanent magnet linear motor in the prior art by providing the tooth-cutting type permanent magnet linear motor, and can greatly weaken the fluctuation of motor tooth slot force and improve the controllability and the efficiency of the permanent magnet linear motor by providing the novel permanent magnet linear motor with the tooth-cutting type structure.
The embodiment of the application provides a tooth-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 edge of the stator tooth is provided with a tooth cutting structure;
The width of the edges of the stator teeth parallel to the air gap direction is smaller than the width of the stator teeth middle section.
Preferably, the width of the edges of the stator teeth parallel to the air gap direction is 1/3 or more of the width of the stator teeth middle section.
Preferably, the tooth cutting structure is a triangular tooth cutting structure, or other polygonal tooth cutting structure.
Preferably, the tooth-cutting type permanent magnet linear motor is a tooth-cutting type double-sided permanent magnet linear motor;
the stator of the tooth-cutting type double-sided permanent magnet linear motor is of an inner-outer double-layer structure and consists of an inner stator and an outer stator, wherein a plurality of inner stator teeth are arranged on an iron core of the inner stator, a plurality of outer stator teeth are arranged on an iron core of the outer stator, and tooth-cutting structures are arranged on edges of the inner stator teeth and the outer stator teeth;
the inner stator teeth are opposite to the cutting tooth structures on the outer stator teeth.
More preferably, the end parts of the inner stator teeth are formed by cutting off the upper corners of a triangular structure in a rectangular shape, the end parts of the inner stator teeth are in a right trapezoid structure, and the width of the edges of the end parts of the inner stator teeth parallel to the air gap direction is smaller than the width of the middle section of the inner stator teeth;
the width of the edge of the outer stator tooth end part parallel to the air gap direction is smaller than the width of the middle section of the outer stator tooth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
More preferably, the end part of the inner stator tooth is formed by cutting off the lower corner of a triangular structure in a rectangular shape, and the end part of the tooth after cutting off is in a right trapezoid structure;
The width of the edge of the outer stator tooth end part parallel to the air gap direction is smaller than the width of the middle section of the outer stator tooth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
Preferably, the tooth cutting type double-sided permanent magnet linear motor has tooth cutting structures with opposite directions arranged at the edges of the inner stator teeth and the outer stator teeth, so that tooth slot force waveforms generated by the inner stator and the outer stator are staggered, and the waveforms are complementary, thereby achieving the effect of weakening the tooth slot force fluctuation.
Preferably, the tooth-cutting type permanent magnet linear motor is a tooth-cutting type unilateral permanent magnet linear motor;
The stator of the tooth-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; the stator teeth from one end of the core to the other are arranged in sequence numbers 1, 2, 3. The (m + 1)/2 th stator tooth is defined as the intermediate tooth, defining the 1 st to (m-1)/2 th stator teeth as a first group of stator teeth, and the (m+3)/2 nd to m-th stator teeth as a second group of stator teeth;
the edges of the first group of stator teeth and the second group of stator teeth are provided with tooth cutting structures, and the directions of the tooth 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 teeth end parts are formed by cutting off the upper corners of a triangular structure in a rectangular shape, the first group of stator teeth end parts are in a right trapezoid structure, and the width of the edge of the first group of stator teeth end parts parallel to the air gap direction is smaller than the width of the corresponding stator teeth middle section;
The edge of the end part of the second group of stator teeth is parallel to the air gap and the width of the middle section of the corresponding stator teeth is smaller than the width of the middle section of the corresponding stator teeth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
More preferably, the first group of stator teeth end parts are formed by cutting off the lower corners of a triangular structure in a rectangular shape, the first group of stator teeth end parts are in a right trapezoid structure, and the width of the edge of the first group of stator teeth end parts parallel to the air gap direction is smaller than the width of the corresponding stator teeth middle section;
the edge of the end part of the second group of stator teeth is parallel to the air gap and the width of the middle section of the corresponding stator teeth is smaller than the width of the middle section of the corresponding stator teeth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
Preferably, the tooth cutting type unilateral permanent magnet linear motor has tooth cutting structures with opposite directions arranged at the edges of the first group of stator teeth and the second group of stator teeth, so that tooth slot force waveforms generated at two ends of the stator are misplaced, and the waveforms are complementary, thereby achieving the effect of weakening the tooth slot force fluctuation.
One or more technical solutions provided in the embodiments of the present application at least have 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, and a tooth cutting structure is formed at the end part of the motor stator tooth, so that the effect of weakening cogging force fluctuation can be achieved. The tooth-cutting type structural design is suitable for a double-sided permanent magnet linear motor and a single-sided permanent magnet linear motor.
2. Aiming at the bilateral permanent magnet linear motor, the shapes of the inner stator teeth and the outer stator teeth of the motor are changed to enable the cogging 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 cogging force fluctuation weakening effect is achieved.
3. Aiming at the unilateral permanent magnet linear motor, the shapes of the upper group and the lower group of stator teeth end parts of the motor are respectively changed to enable the cogging force waveform inside the motor to be misplaced, and the waveforms are highly complementary, so that the cogging force fluctuation weakening effect is achieved.
4. The width of the end part of the tooth is reasonably designed, so that serious tooth saturation effect of the motor caused by the too thin end part of the tooth is avoided, and the thrust fluctuation of the motor is increased.
5. The device has simple structure and low cost, has obvious effect of weakening cogging force fluctuation, greatly improves the controllability and the efficiency of the permanent magnet linear motor, and is suitable for being popularized and used in a large range.
Drawings
Fig. 1 is a cross-sectional view of the overall structure of a tooth-cutting type double-sided cylindrical permanent magnet linear motor according to a first embodiment of the present application;
fig. 2 is a comparative diagram of stator sections of a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor according to a first embodiment of the present application;
Fig. 3 is a schematic diagram of simulated cogging waveform comparison of a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor according to the first embodiment of the present application;
fig. 4 is a cross-sectional view of the overall structure of a tooth-cutting type double-sided cylindrical permanent magnet linear motor according to the second embodiment of the present application;
Fig. 5 is a comparative diagram of stator sections of a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor according to a second embodiment of the present application;
Fig. 6 is a schematic diagram of simulated cogging waveform comparison of a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor according to a second embodiment of the present application;
fig. 7 is a cross-sectional view of the overall structure of a tooth-cutting type single-sided cylindrical permanent magnet linear motor according to the third embodiment of the present application;
fig. 8 is a comparative view of stator sections of a tooth-cutting type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor provided in a third embodiment of the present application;
fig. 9 is a schematic diagram of simulated cogging waveform comparison of a tooth cutting type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor according to the third embodiment of the present application;
Fig. 10 is a cross-sectional view of the overall structure of a tooth-cutting type single-sided cylindrical permanent magnet linear motor according to the fourth embodiment of the present application;
Fig. 11 is a comparative view of stator sections of a tooth-cutting type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor provided in a fourth embodiment of the present application;
Fig. 12 is a schematic diagram illustrating simulated cogging waveform comparison of a tooth cutting type single-sided cylindrical permanent magnet linear motor and a conventional single-sided cylindrical permanent magnet linear motor according to the fourth embodiment of the present application.
Detailed Description
The embodiment of the application solves the technical problems of poor motor controllability and low efficiency caused by larger thrust fluctuation of the permanent magnet linear motor in the prior art by providing the gear cutting type permanent magnet linear motor.
The technical scheme in the embodiment of the application aims to solve the problem of crosstalk, and the overall thought is as follows:
cogging forces caused by cogging are one of the main causes of thrust fluctuations.
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 tooth cutting structure is formed at the end part of the motor stator tooth. The tooth-cutting type structural design is suitable for a double-sided permanent magnet linear motor and a single-sided permanent magnet linear motor.
For the bilateral permanent magnet linear motor, tooth cutting structures with opposite directions are arranged at the edges of the inner stator teeth and the outer stator teeth, so that tooth slot force waveforms generated by the inner stator and the outer stator are staggered, and the waveforms are complementary, and the effect of weakening the tooth slot force fluctuation is achieved.
Aiming at the unilateral permanent magnet linear motor, 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 tooth slot force waveforms generated at the two ends of the stator are misplaced, and the waveforms are complementary, thereby achieving the effect of weakening the tooth slot force fluctuation.
In addition, the cut part is not too wide, so that serious tooth saturation effect of the motor caused by too thin tooth end parts is avoided, and motor thrust fluctuation is increased. Ensuring that 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 stator tooth middle section.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
The tooth-cutting type double-sided permanent magnet linear motor can be specifically divided into a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a tooth-cutting type double-sided flat permanent magnet linear motor, and the tooth-cutting type double-sided cylindrical permanent magnet linear motor is taken as a prototype in the embodiment.
Fig. 1 is a cross-sectional view of the overall structure of a tooth-cutting type double-sided cylindrical permanent magnet linear motor provided in the embodiment of the present application, where the tooth-cutting type double-sided cylindrical permanent magnet linear motor mainly includes an inner stator 1, an outer stator 2, a rotor 3 and an air gap 4.
The primary of the tooth-cutting type double-sided cylindrical permanent magnet linear motor is divided into an inner double-layer structure and an outer double-layer structure, and consists 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 distances from the inner stator 1 and the outer stator 2 to the mover 3 are equal, and the mover 3 moves axially back and forth relative to the inner stator 1 and the outer stator 2. An air gap 4 is arranged between the inner stator 1 and the rotor 3 and between the outer stator 2 and the rotor 3.
The inner stator 1 comprises an inner primary core 101, inner stator teeth 102, inner end teeth 104 and an inner armature winding 103. The inner primary core 101 is located at the innermost side of the motor and is of a tubular structure. The inner primary core 101 is provided with inner stator teeth 102 equally spaced around its periphery, the inner stator teeth of the end being defined as inner end teeth 104. The inner end teeth 104 are set to 1.5 times the width of the inner stator teeth 102.
An inner armature winding 103 is provided between adjacent inner stator teeth 102, and between the inner end teeth 104 and the adjacent inner stator teeth 102, the inner armature winding 103 being tightly fixed to the outside of the inner primary core 101.
The outer stator 2 includes an outer primary core 201, outer stator teeth 202, outer end teeth 204, and outer armature windings 203. The outer primary core 201 is located at the outermost side of the motor and is also of a tubular structure. The outer primary core 201 is provided with outer stator teeth 202 equally spaced around the inner periphery, the outer stator teeth of the end being 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.
An outer armature winding 203 is provided between adjacent outer stator teeth 202, and between an outer end tooth 204 and the adjacent outer stator teeth 202, the outer armature winding 203 being tightly fixed outside the outer primary core 201.
The inner stator teeth 102 are disposed opposite the outer stator teeth 202, the inner end teeth 104 are disposed opposite the outer end teeth 204, and the inner armature winding 103 and the outer armature winding 203 are connected in series.
The inner primary core 101 and the outer primary core 201 are each composed of a sheet of silicon steel.
The inner stator teeth 102, inner end teeth 104, outer stator teeth 202, and outer end teeth 204 are all of a cut tooth construction.
As an alternative embodiment, a tooth-cutting type double-sided cylindrical permanent magnet linear motor employs integer slots, concentrated windings.
In an alternative embodiment, the motor is a 12 slot, 13 tooth, 4 pole motor, the cutting teeth are triangular cutting teeth, the length of the right angle side of the triangle perpendicular to the air gap direction is set as a, and the length of the 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 adopts a triangle cutting method, so that the cut end of the tooth is in a right trapezoid structure, and correspondingly, the lower side of the end of the outer stator tooth 202 adopts a triangle cutting method, so that the end of the tooth is in 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.
The side length b of the triangle is slightly smaller than the average tooth width, so that serious tooth saturation effect of the motor caused by too thin tooth end parts is avoided, and thrust fluctuation of the motor is increased.
Let tooth intermediate section width be s, triangle side length a=0.625×s, side length b must be slightly less than average tooth width, avoid producing serious tooth saturation effect because of tooth end is too thin to make the motor, thus influence motor thrust stability, take b=0.625×s in this embodiment.
The mover mainly comprises a magnetic yoke 301, an inner magnetism isolating ring 302, an outer magnetism isolating ring 303, an inner permanent magnet 304 and an outer permanent magnet 305. The inner magnetism isolating ring 302 and the inner permanent magnet 304 are arranged on the inner side of the magnetic yoke 301, and the inner magnetism isolating 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 arranged outside the magnetic yoke 301, and the outer magnetism isolating ring 303 and the outer permanent magnet 305 are arranged at intervals. And the inner magnetism isolating ring 302 and the outer magnetism isolating ring 303 are correspondingly arranged at two sides of the magnetic yoke 301, and the inner permanent magnet 304 and the outer permanent magnet 305 are correspondingly arranged at two sides of the magnetic yoke 301.
The inner permanent magnet 304 and the outer permanent magnet 305 are radially magnetized, 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 permanent magnet 304 is fixed by the inner magnetism isolating ring 302, and the magnetizing directions of the inner permanent magnet 304 at the upper side and the lower side of the inner 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 comparative diagram of stator sections of a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor according to an embodiment of the present application. Fig. 3 is a schematic diagram of simulated cogging waveform comparison of a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor according to an embodiment of the present application.
As can be seen from fig. 3, the cogging force fluctuation generated by the tooth-cutting type double-sided cylindrical permanent magnet linear motor provided by the embodiment is greatly weakened compared with that of the conventional double-sided cylindrical permanent magnet linear motor.
Example two
Fig. 4 is a cross-sectional view of the overall structure of a tooth-cutting type double-sided cylindrical permanent magnet linear motor according to the embodiment of the present application, which is substantially the same as the first embodiment, and differs from the first embodiment only in that:
the lower side of the end part of the inner stator tooth 102 adopts a triangle cutting method, so that the end part of the tooth is in a right trapezoid structure, the upper side of the end part of the corresponding outer stator tooth 202 adopts a triangle cutting method, so that the end part of the tooth is in a right trapezoid structure, and the width of the cut end part of the tooth 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 the right-angle side of the triangle perpendicular to the air gap direction is a, and the length of the 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 serious tooth saturation effect of the motor caused by too thin tooth end parts is avoided, and thrust fluctuation of the motor is increased.
Let the average tooth width be s, the triangle side length a=0.3×s, the side length b must be slightly smaller than the average tooth width, so as to avoid serious tooth saturation effect generated by the motor due to too thin tooth end, thereby affecting thrust stability of the motor, and in this embodiment, b=0.3×s is taken.
Fig. 5 is a comparative diagram of stator sections of a tooth-cutting type double-sided cylindrical permanent magnet linear motor and a conventional double-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application, and fig. 6 is a schematic diagram of simulated cogging waveform comparison of the tooth-cutting type double-sided cylindrical permanent magnet linear motor and the conventional double-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application.
As can be seen from fig. 6, the cogging force fluctuation generated by the tooth-cutting type double-sided cylindrical permanent magnet linear motor provided by the embodiment is greatly weakened compared with that of the conventional double-sided cylindrical permanent magnet linear motor.
As an alternative embodiment, the triangular tooth cutting method can be analogized to polygonal tooth cutting, and the effect of weakening the fluctuation of tooth space force can be achieved.
Example III
The tooth-cutting type single-sided permanent magnet linear motor can be specifically divided into a tooth-cutting type single-sided cylindrical permanent magnet linear motor and a tooth-cutting type single-sided flat permanent magnet linear motor, and the tooth-cutting type single-sided cylindrical permanent magnet linear motor is taken as a prototype in the embodiment.
Fig. 7 is a general structural cross-sectional view of a tooth-cutting type single-sided cylindrical permanent magnet linear motor according to an embodiment of the present application, where the tooth-cutting type single-sided cylindrical permanent magnet linear motor includes a stator 5, a mover 6 and an air gap 7.
The rotor 6 is arranged outside the stator 5, and an air gap 7 is arranged between the rotor 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, the (m+1)/2 th tooth is defined as an intermediate tooth 503, the 1 st to (m-1)/2 nd teeth are defined as an upper group of stator teeth 502, and the (m+3)/2 nd to m th teeth are defined as a lower group of stator teeth 501.
The upper group of stator teeth 502 and the lower group of stator teeth 501 respectively adopt a triangular tooth cutting structure, the length of the right-angle side of the triangle perpendicular to the air gap direction is set as a, and the length of the right-angle side parallel to the air gap direction is set as b.
In an alternative embodiment, the upper side of the end of the upper stator teeth 502 adopts a triangle cutting method, so that the end of the teeth is in a right trapezoid structure, the lower side of the end of the lower stator teeth 501 adopts a triangle cutting method, so that the end of the teeth is in a right trapezoid structure, and the width of the cut end 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=0.625×s, side length b must be slightly smaller than average tooth width, avoiding serious tooth saturation effect and increasing motor thrust fluctuation caused by too thin tooth end, in this embodiment b=0.625×s.
Fig. 8 is a comparative diagram of stator sections of a cutting-tooth 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, and fig. 9 is a schematic diagram of simulated cogging force waveform comparison of the cutting-tooth type single-sided cylindrical permanent magnet linear motor and the conventional single-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application.
As can be seen from fig. 9, by comparing the cogging force fluctuation of the tooth-cutting type single-sided cylindrical permanent magnet linear motor with that of the conventional single-sided cylindrical permanent magnet linear motor, the cogging force fluctuation of the tooth-cutting type single-sided cylindrical permanent magnet linear motor is greatly weakened.
Example IV
Fig. 10 is a cross-sectional view of the overall structure of a tooth-cutting type single-sided cylindrical permanent magnet linear motor according to the embodiment of the present application, which is substantially the same as the third embodiment, and differs from the third embodiment only in that:
The lower side of the end part of the upper group of stator teeth 502 adopts a triangle cutting method, so that the end part of the teeth is in a right trapezoid structure, the upper side of the end part of the lower group of stator teeth 501 adopts a triangle cutting method, so that the end part of the teeth is in a right 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=0.5×s, side length b must be slightly smaller than average tooth width, avoiding serious tooth saturation effect and increasing motor thrust fluctuation caused by too thin tooth end, in this embodiment b=0.5×s.
Fig. 11 is a comparative diagram of stator sections of a cutting-tooth 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, and fig. 12 is a schematic diagram of simulated cogging force waveform comparison of the cutting-tooth type single-sided cylindrical permanent magnet linear motor and the conventional single-sided cylindrical permanent magnet linear motor provided in an embodiment of the present application.
As can be seen from fig. 12, by comparing the cogging force fluctuation of the tooth-cutting type single-sided cylindrical permanent magnet linear motor with that of the conventional single-sided cylindrical permanent magnet linear motor, the cogging force fluctuation of the tooth-cutting 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 be used for analogizing triangular tooth cutting to polygonal tooth cutting, and the tooth cutting method can achieve the effect of weakening the fluctuation of tooth slot force to a certain extent.
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 element. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of example embodiments.
Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms.
While the application has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and additions may be made without departing from the scope of the application. Those skilled in the art will appreciate that many modifications, adaptations and variations of the present application can be made using the techniques disclosed herein without departing from the spirit and scope of the application, and that many modifications, adaptations and variations of the present application are within the scope of the application as defined by the appended claims.
Claims (7)
1. The 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 edge of the stator tooth is provided with a tooth cutting structure;
The width of the edge of the stator tooth parallel to the air gap direction is smaller than the width of the stator tooth middle section;
the tooth-cutting type permanent magnet linear motor is a tooth-cutting type double-sided permanent magnet linear motor;
the stator of the tooth-cutting type double-sided permanent magnet linear motor is of an inner-outer double-layer structure and consists of an inner stator and an outer stator, wherein a plurality of inner stator teeth are arranged on an iron core of the inner stator, a plurality of outer stator teeth are arranged on an iron core of the outer stator, and tooth-cutting structures are arranged on edges of the inner stator teeth and the outer stator teeth;
The directions of the tooth cutting structures on the inner stator teeth and the outer stator teeth are opposite;
the end part of the inner stator tooth is formed by cutting off an upper corner of a triangular structure in a rectangular shape, the end part of the inner stator tooth is in a right trapezoid structure, and the width of the edge of the end part of the inner stator tooth parallel to the air gap direction is smaller than the width of the middle section of the inner stator tooth;
the width of the edge of the outer stator tooth end part parallel to the air gap direction is smaller than the width of the middle section of the outer stator tooth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
2. The tooth-cutting permanent magnet linear motor according to claim 1, wherein the tooth-cutting structure is a triangular tooth-cutting structure, or other polygonal tooth-cutting structure.
3. The tooth-cutting type permanent magnet linear motor according to claim 1, wherein the end part of the inner stator tooth is formed by cutting off a lower corner of a triangular structure in a rectangular shape, and the end part of the tooth after cutting is in a right trapezoid structure;
The width of the edge of the outer stator tooth end part parallel to the air gap direction is smaller than the width of the middle section of the outer stator tooth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
4. The tooth-cutting type permanent magnet linear motor according to claim 1, wherein the tooth-cutting type double-sided permanent magnet linear motor achieves the effect of weakening tooth slot force fluctuation by arranging tooth-cutting structures with opposite directions on edges of inner stator teeth and outer stator teeth, so that tooth slot force waveforms generated by the inner stator and the outer stator are staggered and are complementary.
5. The 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 edge of the stator tooth is provided with a tooth cutting structure;
The width of the edge of the stator tooth parallel to the air gap direction is smaller than the width of the stator tooth middle section;
the tooth-cutting type permanent magnet linear motor is a tooth-cutting type unilateral permanent magnet linear motor;
The stator of the tooth-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; the stator teeth from one end of the core to the other are arranged in sequence numbers 1, 2, 3. The (m + 1)/2 th stator tooth is defined as the intermediate tooth, defining the 1 st to (m-1)/2 th stator teeth as a first group of stator teeth, and the (m+3)/2 nd to m-th stator teeth as a second group of stator teeth;
The edges of the first group of stator teeth and the second group of stator teeth are provided with tooth cutting structures, and the directions of the tooth cutting structures on the first group of stator teeth and the second group of stator teeth are opposite;
the end parts of the first group of stator teeth are formed by cutting off the upper corners of a triangular structure in a rectangular mode, the end parts of the first group of stator teeth are in a right trapezoid structure, and the width of the edges of the end parts of the first group of stator teeth, which is parallel to the air gap direction, is smaller than the width of the middle section of the corresponding stator teeth;
The edge of the end part of the second group of stator teeth is parallel to the air gap and the width of the middle section of the corresponding stator teeth is smaller than the width of the middle section of the corresponding stator teeth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
6. The tooth-cutting permanent magnet linear motor according to claim 5, wherein the first group of stator tooth end parts are formed by cutting off lower corners of a triangular structure in a rectangular shape, the first group of stator tooth end parts are in a right trapezoid structure, and the width of the edge of the first group of stator tooth end parts parallel to the air gap direction is smaller than the width of the corresponding stator tooth middle section;
the edge of the end part of the second group of stator teeth is parallel to the air gap and the width of the middle section of the corresponding stator teeth is smaller than the width of the middle section of the corresponding stator teeth;
And (3) setting the length of the right-angle side of the triangle parallel to the air gap direction as b, and setting the width of the stator tooth middle section as s, wherein 0< b <0.7s.
7. The tooth-cutting type permanent magnet linear motor according to claim 5, wherein the tooth-cutting type single-sided permanent magnet linear motor has tooth-cutting structures with opposite directions arranged at edges of the first group of stator teeth and the second group of stator teeth, so that tooth slot force waveforms generated at two ends of the stator are dislocated, and the waveforms are complementary, thereby achieving the effect of weakening the tooth slot force fluctuation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010463406.9A CN111525772B (en) | 2020-05-27 | 2020-05-27 | A tooth-cutting permanent magnet linear motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010463406.9A CN111525772B (en) | 2020-05-27 | 2020-05-27 | A tooth-cutting permanent magnet linear motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111525772A CN111525772A (en) | 2020-08-11 |
| CN111525772B true CN111525772B (en) | 2024-12-03 |
Family
ID=71912810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010463406.9A Active CN111525772B (en) | 2020-05-27 | 2020-05-27 | A tooth-cutting permanent magnet linear motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111525772B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884475A (en) * | 2020-08-25 | 2020-11-03 | 辽宁海帝升机械有限公司 | A dual-coil AC permanent magnet synchronous linear motor |
| CN115603478A (en) * | 2022-10-13 | 2023-01-13 | 北京建筑大学（Cn） | Complementary bilateral linear motor |
| CN119582567B (en) * | 2024-10-28 | 2026-04-21 | 北京建筑大学 | Multi-working magnetic potential hybrid excitation linear motor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212012439U (en) * | 2020-05-27 | 2020-11-24 | 浙江理工大学 | Tooth type permanent magnet linear motor |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6304560B2 (en) * | 2015-03-12 | 2018-04-04 | 株式会社安川電機 | Linear motor, linear motor control system |
| CN107070165B (en) * | 2017-02-27 | 2019-10-08 | 华中科技大学 | A kind of flux-reversal type permanent-magnetism linear motor and its application |
| CN108258877B (en) * | 2018-02-05 | 2019-10-11 | 东南大学 | A Permanent Magnet Linear Motor Based on Stator Arc and Inner Ladder Hybrid Structure |
-
2020
- 2020-05-27 CN CN202010463406.9A patent/CN111525772B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212012439U (en) * | 2020-05-27 | 2020-11-24 | 浙江理工大学 | Tooth type permanent magnet linear motor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111525772A (en) | 2020-08-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101492172B1 (en) | Radial and Axial Flux Motor using Integrated Windings | |
| US20140070651A1 (en) | Brushless, ironless stator, single coil motor without laminations | |
| CN111525772B (en) | A tooth-cutting permanent magnet linear motor | |
| CN104811011A (en) | Cylindrical type transverse magnetic-field permanent-magnet flux-switching linear motor | |
| CN107070165B (en) | A kind of flux-reversal type permanent-magnetism linear motor and its application | |
| CN106787306B (en) | A Radial Segmented Modular Switching Flux Disc Motor | |
| WO2009035050A1 (en) | Linear motor and linear motor cogging reduction method | |
| CN102223035B (en) | Low-torque pulse axial magnetic field stator permanent magnet motor | |
| CN103929026B (en) | Magneto | |
| CN104836398B (en) | Rotor magneticfocusing bimorph transducer transverse magnetic field permanent-magnet synchronous motor | |
| CN104767338B (en) | A kind of square angle approach type magneto | |
| CN107493003B (en) | A unit motor modularized bilateral staggered tooth 60° permanent magnet synchronous linear motor | |
| CN202085046U (en) | Axial field permanent magnet brushless motor with smooth torque output | |
| CN102545412A (en) | High-efficiency and large-torque disk type switching magnetoresistive motor | |
| CN111245187B (en) | A toroidal winding dual rotor flux reversal motor | |
| CN102882348B (en) | Dispersed magnetism-conducting block type straight-line switched reluctance motor with single-side stator and rotor with unequal tooth widths | |
| CN212012439U (en) | Tooth type permanent magnet linear motor | |
| CN114844311B (en) | A Z-shaped rotor-tooth double-stator axial magnetic field flux switching permanent magnet motor | |
| CN108880182B (en) | Split-tooth modular vernier permanent magnet linear motor | |
| CN107493004A (en) | A kind of modularization cylindrical permanent linear synchronous motor | |
| CN115347755A (en) | Plate type homopolar same-slot permanent magnet linear motor | |
| AU2016404484B2 (en) | Electric motor structure | |
| CN213547339U (en) | Double-stator split-tooth type cylindrical linear motor and driving mechanism | |
| CN110572004B (en) | Permanent magnet reluctance linear motor | |
| CN1284293C (en) | Permanent magnet magnetic resistance straight line motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |