CN114244059B - Mover assembly and linear motor - Google Patents
Mover assembly and linear motor Download PDFInfo
- Publication number
- CN114244059B CN114244059B CN202111537879.XA CN202111537879A CN114244059B CN 114244059 B CN114244059 B CN 114244059B CN 202111537879 A CN202111537879 A CN 202111537879A CN 114244059 B CN114244059 B CN 114244059B
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- rotor
- magnetism isolating
- mover
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- 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
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- 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
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Linear Motors (AREA)
Abstract
The invention provides a rotor assembly and a linear motor, wherein the rotor assembly comprises a plurality of rotor teeth which are arranged at intervals along the linear motion direction of the rotor assembly, first magnetism isolating holes which penetrate through two sides of the width of a rotor iron core are formed in the rotor teeth, the rotor teeth are projected on any width side face of the rotor iron core, the direction of magnetic lines of force in the rotor teeth faces one side of a stator assembly, and the first magnetism isolating holes can guide the magnetic lines of force from the middle position of the rotor teeth to two side positions. According to the invention, the first magnetism isolating hole arranged on the rotor tooth can guide the magnetic force lines in the rotor tooth from the center of the rotor tooth to two sides, so that the magnetic resistance at the center of the rotor tooth is increased, and the air gap magnetic density waveform is optimized, thereby reducing the thrust fluctuation on the premise of ensuring that the thrust is not reduced, and further improving the positioning accuracy and the repeated positioning accuracy of the linear motor.
Description
Technical Field
The invention belongs to the technical field of design of a rotor assembly, and particularly relates to a rotor assembly and a linear motor.
Background
The linear motion is realized by a motor, and a rotary motor is conventionally adopted to convert the rotary motion into the linear motion by a ball screw, but the ball screw structure has many problems, such as precision, speed, stroke and the like. In recent years, linear servomotors have been newly developed, which effectively solve the problems of the above-described conventional structure. Because the linear motor does not need ball screw transmission, the linear motor is not limited by a screw rod, and the linear motor has better performances such as motion length, maximum speed, maximum acceleration, positioning accuracy and repeated positioning accuracy.
The operating principle of the linear motor is simply understood that the rotary motor is cut along the radius and pulled into a straight line, the stator part becomes a stator, the movable rotor part becomes a rotor, and one of the stator or the rotor is extended along the motion direction, wherein most of the linear motor products are excited by rotor coils and stator permanent magnets. The rotor assemblies can be divided into two categories according to the existence and nonexistence of the rotor, and the rotor assemblies with the iron cores have higher thrust density because the magnetic gathering capacity of the iron cores is obvious; meanwhile, due to the fact that air gap flux density distribution caused by the iron core is uneven, thrust fluctuation of the motor is large, and performance such as positioning accuracy and repeated positioning accuracy is affected.
Disclosure of Invention
Therefore, the invention provides a rotor assembly and a linear motor, which can overcome the defects of large thrust fluctuation and poor positioning and repeated positioning precision of the motor caused by uneven distribution of air gap flux density due to a rotor iron core in the related technology of the linear motor.
In order to solve the above problems, the present invention provides a mover assembly including a plurality of mover teeth disposed at intervals along a linear movement direction thereof, the mover teeth being configured with first magnetism isolating holes penetrating both sides of a width of the mover core, the mover teeth being projected on any one width side of the mover core, a direction of magnetic lines of force in the mover teeth being directed toward one side of a stator assembly, the first magnetism isolating holes being capable of guiding the magnetic lines of force from a middle position of the mover teeth to both side positions.
In some embodiments, the first flux barrier has a large area portion near a side of the stator assembly and a first small area portion away from the side of the stator assembly.
In some embodiments, the first magnetically isolating aperture further comprises a second small area on a side of the large area proximate to the stator assembly.
In some embodiments, projected on either width side of the mover core, the mover teeth are symmetrical about a first symmetry axis, the first symmetry axis is perpendicular to a moving direction of the mover core, and the first magnetism isolating holes are symmetrical about the first symmetry axis.
In some embodiments, the first magnetism isolating hole comprises a first straight line edge close to one side of the stator component, the first straight line edge is parallel to the tooth end face of the rotor tooth, the perpendicular distance between the first straight line edge and the tooth end face is B, and the B is more than 0.5mm and less than 1.5mm.
In some embodiments, the first magnetism isolating hole further includes a second straight line edge far away from one side of the stator assembly, the second straight line edge is parallel to the first straight line edge, the first magnetism isolating hole further includes a third straight line edge and a fourth straight line edge which are parallel to each other and located on two sides of the first symmetry axis, end portions, close to one side of the stator assembly, of the third straight line edge and the fourth straight line edge are respectively connected with two ends of the first straight line edge through a first oblique line edge and a second oblique line edge, and end portions, far away from one side of the stator assembly, of the third straight line edge and the fourth straight line edge are respectively connected with two ends of the second straight line edge through a third oblique line edge and a fourth oblique line edge.
In some embodiments, the length of the rotor tooth is a, the perpendicular distance between the first straight line side and the second straight line side is B2, the length of the first straight line side is a1, the perpendicular distance between the third straight line side and the fourth straight line side is a2, the length of the third straight line side is B3, the length of the second straight line side is a3, the perpendicular distance from the end point of the third straight line side close to the stator assembly side to the first straight line side is B1, and 0 < a2/a < 0.2,0.2 < a1/a2 < 0.8,2 < B2/B < 20,0.05 < B1/B2 < 0.2,0.1 < B3/B2 < 0.4,0.4 < a3/a2 < 0.8.
In some embodiments, the rotor teeth are further configured with second magnetism isolating holes penetrating through both sides of the width of the rotor core, the second magnetism isolating holes are located on the side of the first magnetism isolating holes away from the stator assembly, and the second magnetism isolating holes are symmetrical about the first symmetry axis.
In some embodiments, a punching sheet laminating connecting piece penetrates through the second magnetism isolating hole; and/or the second magnetism isolating hole is rectangular.
In some embodiments, the first flux barrier has a cooling conduit therein.
In some embodiments, a shock absorbing material is filled between the cooling pipe and the first magnetism isolating hole.
In some embodiments, the shock absorbing material comprises an epoxy.
The invention also provides a linear motor which comprises the rotor assembly.
According to the rotor assembly and the linear motor, the first magnetic isolation hole arranged on the rotor tooth can guide magnetic lines in the rotor tooth from the center of the rotor tooth to two sides, so that the magnetic resistance at the center of the rotor tooth is increased, and the air gap magnetic flux density waveform is optimized, so that thrust fluctuation can be reduced on the premise of ensuring that the thrust is not reduced, and the positioning accuracy and the repeated positioning accuracy of the linear motor are improved.
Drawings
Fig. 1 is a schematic structural view of a linear motor according to an embodiment of the present invention;
FIG. 2 is an enlarged partial view at A of FIG. 1 in one embodiment;
fig. 3 is a partial enlarged view of a portion a of fig. 1 in another embodiment.
The reference numerals are represented as:
1. a stator assembly; 11. a stator core; 12. a permanent magnet; 2. a mover assembly; 21. a mover core; 211. the rotor teeth; 22. a winding; 3. a first magnetism isolating hole; 4. a cooling duct; 5. a second magnetism isolating hole; 51. the punching sheets are laminated with the connecting piece; 6. a shock absorbing material.
Detailed Description
Referring to fig. 1 to 3 in combination, according to an embodiment of the present invention, a linear motor, especially a linear servo motor, is provided, including a stator assembly 1 and a mover assembly 2 paired with the stator assembly 1, where the mover assembly 2 is capable of generating a linear motion with respect to the stator assembly 1, the stator assembly includes a stator core 11 and a plurality of permanent magnets 12 connected to one side of the stator core 11 facing the mover assembly 2, the mover assembly 2 includes a mover core 21, the mover core 21 includes a plurality of mover teeth 211 spaced along a linear motion direction thereof, a winding 22 is wound on the mover teeth 211, first magnetism isolating holes 3 penetrating through both sides of a width of the mover core 21 are configured on the mover teeth 211, and are projected on any width side of the mover core 21, a direction of magnetic lines in the mover teeth 211 faces one side of the stator assembly 1, and the first magnetism isolating holes 3 are capable of guiding the magnetic lines from a middle position of the mover teeth 211 to two side positions. In the technical scheme, the first magnetism isolating holes 3 arranged on the moving element teeth 211 can guide magnetic lines of force in the moving element teeth 211 from the center of the moving element teeth 211 to two sides, so that the magnetic resistance at the center of the moving element teeth 211 is increased, and air gap magnetic flux density waveforms are optimized, so that thrust fluctuation can be reduced on the premise that thrust is not reduced, and the positioning accuracy and the repeated positioning accuracy of the linear motor are improved.
It is understood that the mover assembly 2 also has an insulating structure and other connecting and protecting structures. Current is introduced into the winding 22 to form a winding magnetic field, the rotor iron core 21 plays a role in magnetic concentration to collect the winding magnetic field on the iron core, the winding magnetic field mainly interacts with the excitation magnetic field through the rotor iron core 21 except for a small part of magnetic leakage to generate thrust, the magnetic field passes through the iron core yoke part, the tooth part and the air gap to reach the stator, and finally returns to the iron core tooth part and the iron core yoke part through the air gap to form a closed loop.
In some embodiments, the first magnetism isolating hole 3 has a large area portion close to one side of the stator assembly 1 and a first small area portion far from one side of the stator assembly 1, and in this case, the shape of the first magnetism isolating hole 3 may be, for example, a trapezoid (the long side of the trapezoid is close to one side of the stator assembly 1), and further, the first magnetism isolating hole further includes a second small area portion, the second small area portion is located at one side of the large area portion close to the stator assembly 1, so that the first magnetism isolating hole 3 forms a structure with two small ends and a large middle, such as a spindle shape or a water drop shape.
In some embodiments, the rotor teeth 211 are symmetrical about a first symmetry axis perpendicular to a moving direction of the rotor core 21, and the first magnetism isolating holes 3 are symmetrical about the first symmetry axis, projected on either width side of the rotor core 21.
In a specific embodiment, the first magnetism isolating hole 3 includes a first straight line edge near one side of the stator assembly 1, the first straight line edge is parallel to a tooth end face of the rotor tooth 211, and a vertical distance between the first straight line edge and the tooth end face is B, where B is greater than 0.5mm and less than 1.5mm, and magnetic lines of force can be conducted through the vertical distance B, and the foregoing range can make the magnetic density between the first straight line edge and the iron core tooth large, and make the air gap magnetic density near this place in a better interval.
In some embodiments, the rotor teeth 211 are further configured with second magnetism isolating holes 5 penetrating through both sides of the width of the rotor core 21, the second magnetism isolating holes 5 are located on a side of the first magnetism isolating holes 3 away from the stator assembly 1, and the second magnetism isolating holes 5 are symmetrical about the first symmetry axis, so that the corresponding magnetic circuits can be optimized together with the first magnetism isolating holes 3, and further thrust fluctuation can be reduced.
In one embodiment, the second magnetism isolating hole 5 is rectangular, and specifically has a width side parallel to the first straight side and a length side parallel to the third straight side, the width side has a width c1, and the length side has a length d1, wherein c1/a2 < 0.6,0.2 < d1/b2 < 0.6.
Generally speaking, because the connection mode of the punching sheets of the rotor core 21 mostly adopts the welding and riveting mode except for the self-adhesive glue, and the influence of the air gap of the iron core tooth surface on the air gap flux density is large, and a welding or riveting groove is not easy to open, so that the punching sheet tooth position of the rotor core 21 is easy to warp, therefore, as another preferred embodiment, the punching sheet laminated connecting piece 51 is penetrated and arranged in the second magnetic isolation hole 5, the punching sheet laminated connecting piece 51 is specifically, for example, a rivet, so that the second magnetic isolation hole 5 can be used as a connecting piece penetrating hole while optimizing the magnetic circuit, the punching sheet tilting phenomenon of the rotor core 21 is effectively prevented, and the structural strength of the iron core is enhanced.
In other embodiments, the first magnetism isolating hole 3 has a cooling pipe 4 therein, and a cooling medium, such as water, oil, or even a cooling medium, may be introduced into the cooling pipe 4, so as to effectively cool the rotor core 21 and the windings 22 thereon, and effectively prevent the temperature rise of the motor. Furthermore, a damping material 6 is filled between the cooling pipeline 4 and the first magnetism isolating hole 3, so that the vibration of the motor can be effectively reduced, and the positioning precision of the motor is further improved. Preferably, the damping material 6 comprises epoxy resin, and the epoxy resin is filled in a space between the first magnetism isolating hole 3 and the cooling pipeline 4 in an injection molding manner, so that the heat conduction, heat dissipation and insulation effects can be guaranteed while vibration reduction is realized.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (11)
1. A rotor assembly, characterized by comprising a rotor core (21), wherein the rotor core (21) comprises a plurality of rotor teeth (211) arranged at intervals along the linear motion direction of the rotor core, the rotor teeth (211) are provided with first magnetism isolating holes (3) penetrating through two sides of the width of the rotor core (21), the first magnetism isolating holes (3) project on any width side of the rotor core (21), the direction of magnetic force lines in the rotor teeth (211) faces one side of a stator assembly (1), and the first magnetism isolating holes (3) can guide the magnetic force lines from the middle position of the rotor teeth (211) to two side positions; second magnetism isolating holes (5) penetrating through two sides of the width of the rotor iron core (21) are further formed in the rotor teeth (211), the second magnetism isolating holes (5) are located on one side, away from the stator assembly (1), of the first magnetism isolating holes (3), the second magnetism isolating holes (5) are symmetrical about a first symmetry axis, and punching sheet laminating connecting pieces (51) penetrate through the second magnetism isolating holes (5); the first magnetism isolating hole (3) is internally provided with a cooling pipeline (4).
2. The mover assembly according to claim 1, wherein the first magnetism isolating hole (3) has a large area portion near a side of the stator assembly (1) and a first small area portion far from the side of the stator assembly (1).
3. The mover assembly of claim 2, wherein the first magnetically isolating aperture further comprises a second small area on a side of the large area proximate the stator assembly (1).
4. The mover assembly according to claim 3, wherein the mover teeth (211) are symmetrical with respect to a first symmetry axis perpendicular to a moving direction of the mover core (21), projected on either width side of the mover core (21), and the first magnetism isolating holes (3) are symmetrical with respect to the first symmetry axis.
5. The mover assembly according to claim 4, wherein the first magnetism isolating hole (3) includes a first straight side near one side of the stator assembly (1), the first straight side is parallel to a tooth end surface of the mover tooth (211), and a perpendicular distance between the first straight side and the tooth end surface is B,0.5mm < B < 1.5mm.
6. The mover assembly according to claim 5, wherein the first magnetism isolating hole (3) further includes a second straight line side away from one side of the stator assembly (1), the second straight line side is parallel to the first straight line side, the first magnetism isolating hole (3) further includes a third straight line side and a fourth straight line side which are parallel to each other and located on both sides of the first symmetry axis, end portions of the third straight line side and the fourth straight line side, which are respectively close to one side of the stator assembly (1), are respectively connected to both ends of the first straight line side through a first oblique line side and a second oblique line side, and end portions of the third straight line side and the fourth straight line side, which are respectively away from one side of the stator assembly (1), are respectively connected to both ends of the second straight line side through a third oblique line side and a fourth oblique line side.
7. The mover assembly according to claim 6, wherein a length of the mover tooth (211) is A, a perpendicular distance between the first straight side and the second straight side is B2, a length of the first straight side is a1, a perpendicular distance between a third straight side and the fourth straight side is a2, a length of the third straight side is B3, a length of the second straight side is a3, and a perpendicular distance from an end point of the third straight side close to the stator assembly (1) side to the first straight side is B1,0 < a2/A < 0.2,0.2 < a1/a2 < 0.8,2 < B2/B < 20,0.05 < B1/B2 < 0.2,0.1 < B3/B2 < 0.4,0.4 < a3/a2 < 0.8.
8. The mover assembly according to claim 1, wherein the second magnetism isolating holes (5) are rectangular.
9. The mover assembly according to claim 1, wherein a damping material (6) is filled between the cooling duct (4) and the first magnetism isolating hole (3).
10. The mover assembly of claim 9, wherein the damping material (6) comprises epoxy.
11. A linear motor comprising a mover assembly (2), characterized in that said mover assembly (2) is a mover assembly as claimed in any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537879.XA CN114244059B (en) | 2021-12-15 | 2021-12-15 | Mover assembly and linear motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537879.XA CN114244059B (en) | 2021-12-15 | 2021-12-15 | Mover assembly and linear motor |
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| Publication Number | Publication Date |
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| CN114244059A CN114244059A (en) | 2022-03-25 |
| CN114244059B true CN114244059B (en) | 2023-03-21 |
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| CN202111537879.XA Active CN114244059B (en) | 2021-12-15 | 2021-12-15 | Mover assembly and linear motor |
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| GB358240A (en) * | 1930-09-17 | 1931-10-08 | William Norman Kilner | Improvements in dynamo electric machines |
| CN102510173A (en) * | 2011-11-09 | 2012-06-20 | 哈尔滨泰富实业有限公司 | Cooling structure of flat permanent-magnet linear water-cooling motor |
| JP2014060883A (en) * | 2012-09-19 | 2014-04-03 | Okuma Corp | Linear motor |
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| CN111711292A (en) * | 2020-07-24 | 2020-09-25 | 珠海格力节能环保制冷技术研究中心有限公司 | Rotor structure, motor and compressor |
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| JP3872055B2 (en) * | 2003-06-20 | 2007-01-24 | 三菱電機株式会社 | Linear motor armature |
| US6949846B2 (en) * | 2003-08-29 | 2005-09-27 | Sanyo Denki Co., Ltd. | Linear motor with reduced cogging force |
| JP4102797B2 (en) * | 2004-11-19 | 2008-06-18 | 三菱電機株式会社 | Armature core, linear motor and manufacturing method thereof |
| CN101895187B (en) * | 2010-08-17 | 2012-06-27 | 哈尔滨工业大学 | Linear permanent magnet synchronous motor |
| US20130033125A1 (en) * | 2011-08-03 | 2013-02-07 | Kabushiki Kaisha Yaskawa Denki | Linear motor armature and linear motor |
| DE112015006568T5 (en) * | 2015-05-26 | 2018-03-15 | Mitsubishi Electric Corporation | Rotor core, rotor and linear motor |
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB358240A (en) * | 1930-09-17 | 1931-10-08 | William Norman Kilner | Improvements in dynamo electric machines |
| CN102510173A (en) * | 2011-11-09 | 2012-06-20 | 哈尔滨泰富实业有限公司 | Cooling structure of flat permanent-magnet linear water-cooling motor |
| JP2014060883A (en) * | 2012-09-19 | 2014-04-03 | Okuma Corp | Linear motor |
| JP2016082623A (en) * | 2014-10-10 | 2016-05-16 | 日立金属株式会社 | Stator for linear motor |
| CN106026527A (en) * | 2016-07-11 | 2016-10-12 | 新誉集团有限公司 | Linear motor water cooling mechanism and cooling method thereof |
| CN108964405A (en) * | 2018-08-30 | 2018-12-07 | 珠海格力电器股份有限公司 | Mover assembly, linear motor |
| CN109660104A (en) * | 2018-10-31 | 2019-04-19 | 广州市昊志机电股份有限公司 | A kind of linear electric motor primary component |
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