CN113890278B - Magneto-electric encoder and motor - Google Patents
Magneto-electric encoder and motor Download PDFInfo
- Publication number
- CN113890278B CN113890278B CN202111131575.3A CN202111131575A CN113890278B CN 113890278 B CN113890278 B CN 113890278B CN 202111131575 A CN202111131575 A CN 202111131575A CN 113890278 B CN113890278 B CN 113890278B
- Authority
- CN
- China
- Prior art keywords
- heat
- permanent magnet
- heat insulation
- magneto
- sensing unit
- 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
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The application relates to the technical field of encoders, and discloses a magneto-electric encoder and a motor. Wherein the magneto-electric encoder comprises: the heat insulation device comprises a main body, a heat insulation assembly, a permanent magnet and a circuit board; the main body is assembled and connected with the motor through the heat insulation component; the heat insulation assembly comprises a first heat insulation piece and a second heat insulation piece, a first side surface of the first heat insulation piece is assembled and connected with an output shaft of the motor, and the permanent magnet is assembled on a second side surface of the first heat insulation piece; the circuit board comprises a magnetic sensing unit; the second heat insulating piece is arranged between the permanent magnet and the magnetic sensing unit, so that heat is transferred from the first heat insulating piece to the second heat insulating piece. Compared with the prior art, this application carries out the heat through first heat-proof spare between output shaft and permanent magnet and blocks the heat once more between permanent magnet and magnetic sensing unit, and then reduces the motor in the operation in-process, and the heat flow is to the transfer of magnetic sensing unit, effectively avoids the inside temperature of magnetoelectric encoder to rise, reduces the temperature drift phenomenon of permanent magnet and magnetic sensing section department.
Description
Technical Field
The application relates to the technical field of encoders, in particular to a magneto-electric encoder and a motor.
Background
The magneto-electric encoder adopts the Hall element to measure the angle or displacement of the changed magnetic material, has the characteristics of reliability, low price, pollution resistance and the like, and is widely applied to the servo motor. The traditional magneto-electricity encoder consists of a permanent magnet, a circuit board, a microprocessor and a magnetic sensor, and a magnetic conductive shell is assembled and connected with an output shaft of the motor through a coupling structure. Because the motor can produce great heat when the operation, these heat can lead to the magnetic sensor through the assembly structure and the casing between motor and the magnetoelectric encoder, this can arouse the temperature drift (temperature drift) problem of permanent magnet and magnetic sensor in the magnetoelectric encoder, along with the increase of temperature, can lead to the fact the decay to the signal transmission of magnetoelectric encoder, leads to influencing the measurement accuracy decline of magnetoelectric encoder.
Disclosure of Invention
In order to solve the technical problem that the temperature of the permanent magnet and the magnetic sensor in the magnetoelectric encoder is high, which leads to the poor measurement accuracy of the magnetoelectric encoder, the main aim of the application is to provide a magnetoelectric encoder and a motor which can effectively reduce the temperature of the permanent magnet and the magnetic sensor in the magnetoelectric encoder and improve the measurement accuracy of the magnetoelectric encoder.
In order to achieve the purpose of the invention, the application adopts the following technical scheme:
according to one aspect of the present application, there is provided a magneto-electric encoder comprising: the heat insulation device comprises a main body, a heat insulation assembly, a permanent magnet and a circuit board;
the main body is assembled and connected with the motor through the heat insulation assembly;
the heat insulation assembly comprises a first heat insulation piece and a second heat insulation piece, wherein a first side surface of the first heat insulation piece is assembled and connected with an output shaft of the motor, and the permanent magnet is assembled on a second side surface of the first heat insulation piece so as to block heat conduction from the first side surface to the second side surface through the first heat insulation piece; the method comprises the steps of carrying out a first treatment on the surface of the
The circuit board comprises a magnetic sensing unit;
the second heat insulation piece is arranged between the permanent magnet and the magnetic sensing unit, so that heat conduction from the second side to one side of the circuit board is blocked by the second heat insulation piece.
According to an embodiment of the application, wherein the first side comprises a coupling part for rotational connection with the output shaft via the coupling part;
the second side surface comprises a limiting part so as to limit the relative displacement between the permanent magnet and the first heat insulation piece through the limiting part.
According to an embodiment of the application, the second heat insulation piece comprises a first installation surface and a second installation surface, and the first installation surface is in interference fit connection with the permanent magnet; the second mounting surface faces the magnetic sensing unit, and a heat conducting cavity is arranged between the second mounting surface and the circuit board.
According to an embodiment of the application, the first mounting surface comprises a first assembling portion, the permanent magnet comprises a second assembling portion, and the second heat insulation piece and the permanent magnet are clamped with the second assembling portion in a concave-convex fit mode through the first assembling portion.
According to an embodiment of the application, the first assembling part is a protruding block extending towards one side of the permanent magnet, and the second assembling part is a groove extending away from one side of the second heat insulating member;
or;
the first assembly part is a groove extending away from one side of the permanent magnet, and the second assembly part is a projection extending towards one side of the second heat insulation part.
According to an embodiment of the present application, a cross section of the first fitting part and the second fitting part along a radial direction of the output shaft is circular, or;
the first assembly part and the second assembly part are rectangular in section along the radial direction of the output shaft.
According to an embodiment of the application, the second mounting surface comprises a receiving cavity, and the magnetic sensing unit is arranged in the receiving cavity.
According to an embodiment of the application, the second mounting surface has a surface area that is larger than a surface area of the first mounting surface.
According to an embodiment of the present application, the second mounting surface includes a plurality of heat dissipating parts, so that heat is introduced into the heat conducting cavity from the first mounting surface through the heat dissipating parts.
According to an embodiment of the present application, the heat dissipation portion and the magnetic sensing unit are arranged in a staggered manner.
According to an embodiment of the present application, a cross section of the heat dissipation portion is wavy or zigzag in an axial direction of the output shaft.
According to another aspect of the present application, there is provided an electric machine comprising a magneto-electric encoder as described above.
According to the technical scheme, the magneto-electricity encoder and the motor have the advantages that:
firstly, the permanent magnet is assembled on the second side surface of the first heat insulation piece through the assembly connection of the first heat insulation piece and the output shaft of the motor, and the heat of the output shaft is isolated through the first heat insulation piece, so that the heat received by the permanent magnet is reduced;
and secondly, the second heat insulation piece is arranged between the permanent magnet and the magnetic sensing unit, so that the heat transfer to the direction of the magnetic sensing unit and the circuit board is further reduced through the second heat insulation piece, the temperature of the permanent magnet and the position of the magnetic sensing unit is reduced, the temperature drift effect is further reduced, the attenuation condition in the signal transfer process in the magneto-electric encoder is reduced, and the measurement precision between the magneto-electric encoders is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic perspective view of an assembly of a magneto-electric encoder and a motor according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a magneto-electric encoder and motor assembly according to an embodiment of the present disclosure;
FIG. 3 is a schematic cross-sectional view of a magneto-electric encoder according to an embodiment of the present disclosure;
FIG. 4 is a schematic cross-sectional view of a first thermal shield in a magneto-electric encoder according to an embodiment of the present disclosure;
fig. 5 is a schematic cross-sectional structure of a permanent magnet in a magneto-electric encoder according to an embodiment of the present application;
FIG. 6 is a schematic cross-sectional view of a second thermal shield in a magneto-electric encoder according to a first embodiment of the present disclosure;
FIG. 7 is a schematic cross-sectional view of a second thermal shield in a magneto-electric encoder according to a second embodiment of the present disclosure;
FIG. 8 is a schematic cross-sectional view of a second thermal shield in a magneto-electric encoder according to a third embodiment of the present disclosure;
FIG. 9 is a schematic cross-sectional view of an assembly of a permanent magnet and a second thermal shield in a magneto-electric encoder according to the present application;
fig. 10 is a schematic diagram of a magnetic force line trend structure of a permanent magnet in a magneto-electric encoder according to a fourth embodiment of the present application;
fig. 11 is a schematic diagram of a magnetic force line trend structure of a permanent magnet in a magneto-electric encoder according to a fifth embodiment of the present application.
Wherein:
1. a main body;
100. a thermal insulation assembly;
101. a first heat insulating member; 111. a first side; 112. a second side; 113. a shaft coupling portion; 114. a limit part;
102. a second heat insulating member; 121. a first mounting surface; 1211. a first fitting portion; 122. a second mounting surface; 1221. a receiving chamber; 1222. a heat dissipation part; 123. a fitting hole;
2. a permanent magnet; 201. a second fitting portion;
3. a circuit board; 301. a magnetic sensing unit;
200. a motor; 211. an output shaft;
4. a heat conducting cavity;
300. radial direction of the output shaft;
400. the axial direction of the output shaft;
A. a first region; B. a second region; h. the minimum spacing distance between the permanent magnet and the magnetic sensing unit.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The principle of the magnetic inductor is based on Hall effect, namely, a magnetic field is applied to the exterior of an energized conductor, and when the direction of the applied magnetic field is perpendicular to the current direction in the energized conductor, a potential difference exists between two surfaces of the conductor perpendicular to the current and the magnetic field direction. The magneto-electric encoder adopts the Hall element to measure the angle or displacement of the changed magnetic material, and because the permanent magnet and the sensor inside the magneto-electric encoder are easily affected by temperature, the permanent magnet and the sensor are easily subjected to temperature drift phenomenon under the condition of higher temperature, thus leading to inaccurate measurement accuracy of the magneto-electric encoder.
In actual use, because the motor generates larger heat when in operation, the heat is transmitted to the permanent magnet and the magnetic sensor or the magnetic induction chip in the magnetoelectric encoder through the output shaft and the shell, so that the signal transmission of the magnetic encoder is attenuated, and the precision of the magnetoelectric encoder is reduced. For solving among the prior art because permanent magnet and the magnetic sensor chip in the magnetoelectric sensor appear the temperature drift problem easily, lead to the relatively poor technical problem of measurement accuracy in the magnetoelectric encoder, this application provides a magnetoelectric encoder according to an aspect of this application, includes: a main body 1, a heat insulation assembly 100, a permanent magnet 2 and a circuit board 3;
the main body 1 is assembled and connected with the motor 200 through the heat insulation assembly 100;
the heat insulation assembly 100 comprises a first heat insulation member 101 and a second heat insulation member 102, wherein a first side 111 of the first heat insulation member 101 is assembled and connected with an output shaft 211 of the motor 200, and the permanent magnet 2 is assembled on a second side 112 of the first heat insulation member 101 so as to block heat conduction from the first side 111 to the second side 112 through the first heat insulation member 101;
the circuit board 3 comprises a magnetic sensing unit 301;
the second heat insulator 102 is disposed between the permanent magnet 2 and the magnetic sensor unit 301 to block heat conduction from the second side 112 to the circuit board 3 side through the second heat insulator 102.
Referring to fig. 1 for a schematic perspective view of an assembly of a magneto-electric encoder and a motor 200 according to an embodiment of the present application, fig. 2 for a schematic cross-sectional structure of an assembly of a magneto-electric encoder and a motor 200 according to an embodiment of the present application, and fig. 3 for a schematic cross-sectional structure of a magneto-electric encoder according to an embodiment of the present application.
The main body 1 of the magneto-electric encoder is first assembled and connected with the housing of the motor 200 by the heat insulation assembly 100, so that heat transfer to one side of the main body 1 during the operation of the motor 200 is reduced by the heat insulation assembly 100.
The heat insulation assembly 100 includes a first heat insulation member 101 and a second heat insulation member 102, wherein the first side 111 of the first heat insulation member 101 is assembled with the output shaft 211 of the motor 200, and the second side 112 of the first heat insulation member 101 is assembled with the permanent magnet 2, so that the first heat insulation member 101 can block heat from one end of the output shaft 211 of the motor 200 from being directly transferred to the permanent magnet 2, and the second side 112 can provide an installation position for the permanent magnet 2, thereby simplifying the assembly structure.
The second heat insulation component 100 is disposed between the permanent magnet 2 and the magnetic sensing unit 301, and is used for blocking heat transferred from one side of the first heat insulation component 101 and one side of the permanent magnet 2 to one side of the circuit board 3, that is, heat transferred to the magnetic sensing unit 301 is heat blocked by the first heat insulation component 101 and the second heat insulation component 102, so that heat at the magnetic sensing unit 301 is reduced.
As an example, the magnetic sensing unit 301 includes a microprocessor, a magnetic sensing chip, or an electronic device such as a magnetic sensor, and the magnetic sensing unit 301 may include a plurality of magnetic sensing units 301 disposed at intervals on the circuit board 3.
The main body 1 further comprises a shielding plate (not labeled in the figure), and the circuit board 3 is assembled and connected with the main body 1 through the shielding plate, and the shielding plate is used for shielding and isolating the external magnetic field of the main body 1.
The shielding plate and the second heat insulation member 102 are respectively arranged at two sides of the circuit board 3, the second heat insulation member 102 is arranged at one side facing the permanent magnet 2, and the shielding plate can also block heat transfer from the circuit board 3 to the outer cover at the main body 1.
According to an embodiment of the present application, wherein the first side 111 comprises a coupling portion 113 to be rotatably connected with the output shaft 211 through the coupling portion 113;
the second side 112 includes a limiting portion 114 to limit the relative displacement of the permanent magnet 2 with respect to the first heat insulator 101 by the limiting portion 114.
Referring to fig. 3, the shaft connecting portion 113 is configured to be connected to the output shaft 211 by a shaft, so that the output shaft 211 may rotate relative to the permanent magnet 2, the second side 112 has a limiting portion 114, and the limiting portion 114 may limit and fix the permanent magnet 2 to the first heat insulating member 101.
Referring to fig. 4, which is a schematic cross-sectional structure of a first heat insulating member in a magneto-electric encoder according to an embodiment of the present application, as an example, the limiting portion 114 may be configured to be capable of accommodating a limiting groove of the permanent magnet 2, the permanent magnet 2 may be fixed in the limiting groove in a limiting manner, and the coupling portion 113 may be configured to be in a shaft seat structure, so that the output shaft 211 may rotate relative to the permanent magnet 2 through the shaft seat. The person skilled in the art may set the assembly area of the shaft seat and the output shaft 211 according to the actual situation, and the same may set the groove depth of the limit groove according to the volume of the permanent magnet 2, and preferably, the permanent magnet 2 may just be completely assembled in the limit groove, so as to improve the stability of the assembly between the first heat insulating member 101 and the permanent magnet 2, and simultaneously reduce the noise in the operation process of the motor 200.
As an example, the second heat insulating member 102 may be attached to the circuit board 3 in a limited manner, and a set distance is formed between the second heat insulating member 102 and the permanent magnet 2 and between the second heat insulating member and the second side surface 112, so as to form a heat dissipation cavity (not labeled in the figure) within the set distance, so that heat of the second side surface 112 and the permanent magnet 2 is further blocked by the heat dissipation cavity, and heat conduction from the heat dissipation cavity to one side of the circuit board 3 is blocked by the second heat insulating member 102.
Referring to fig. 6, a schematic cross-sectional structure of a second heat insulating member in a magneto-electric encoder according to the first embodiment of the present application is provided, preferably, a receiving cavity 1221 is disposed on a side of the second heat insulating member 102 facing the magnetic sensing unit 301, the magnetic sensing unit 301 is assembled in the receiving cavity 1221, on one hand, the magnetic sensing unit 301 is used as a avoidance position through the receiving cavity 1221, and on the other hand, heat conduction from the second heat insulating member 102 to the circuit board 3 side is further blocked by a wall body and a matching gap of the receiving cavity 1221.
Referring to fig. 8, a schematic cross-sectional structure of a second heat insulating member in a magneto-electric encoder according to a third embodiment of the present application is provided, the second heat insulating member 102 is provided with an assembling position, the second heat insulating member 102 is assembled and connected with the first heat insulating member 101 through the assembling position, the assembling position is provided with an assembling hole 123, and the first heat insulating member 101 is assembled and connected with the second heat insulating member 102 through the assembling hole 123 and a locking member (not shown in the figure), so that heat transfer from the first heat insulating member 101 to one side of the circuit board 3 is further blocked through the assembling position.
Fig. 9 is a schematic cross-sectional structure diagram of an assembly of a permanent magnet and a second heat insulation member in a magneto-electric encoder according to an embodiment of the present application, where the second heat insulation member 102 includes a first mounting surface 121 and a second mounting surface 122, and the first mounting surface 121 is connected with the permanent magnet 2 in an interference fit manner; the second mounting surface 122 faces the magnetic sensing unit 301, and a heat conducting cavity 4 is arranged between the second mounting surface 122 and the circuit board 3.
The first mounting surface 121 is in interference fit connection with the permanent magnet 2, so that heat conduction from the permanent magnet 2 and the first heat insulating member 101 to one side of the circuit board 3 can be further blocked by the second heat insulating member 102.
A heat conducting cavity 4 is disposed between the second mounting surface 122 and the circuit board 3, and the volume of the heat conducting cavity 4 may be set by the heat conducting cavity 4 according to the actual assembly requirement, so as to further reduce the heat conducted to the magnetic sensing unit 301 and one side of the circuit board 3 through the air layer in the heat conducting cavity 4.
Referring to fig. 5, which is a schematic cross-sectional structure diagram of a permanent magnet in a magneto-electric encoder according to an embodiment of the present application, the first mounting surface 121 includes a first fitting portion 1211, the permanent magnet 2 includes a second fitting portion 201, and the second heat insulator 102 is in a concave-convex fit and clamping connection with the permanent magnet 2 and the second fitting portion 201 through the first fitting portion 1211, so that heat conduction from the permanent magnet 2 to one side of the circuit board 3 is further avoided through the fit and clamping connection of the first fitting portion 1211 and the second fitting portion 201.
A plurality of the first and second fitting parts 1211 and 201 may be provided to improve the stability of the fitting between the permanent magnet 2 and the second heat insulator 102 and the heat exchange area.
In particular, a set insulation thickness is provided between the first fitting portion 1211 of the first mounting surface 121 and the receiving chamber 1221 to further prevent heat from being conducted to the magnetic sensing unit 301 through the receiving chamber 1221.
As an example, the permanent magnet 2 includes a first region a and a second region B, the second fitting portion 201 is disposed in the first region a, the first fitting portion 1211 is disposed facing the first region a, and a minimum distance of a space between the first region a and/or the second region B and the magnetic sensing unit 301 in an axial direction 400 of the output shaft is within an optimal range of signal transmission between the permanent magnet 2 and the magnetic sensing unit 301, and a minimum distance of a space between the permanent magnet 2 and the magnetic sensing unit 301 is h to reduce a fitting space and control an axial thickness of the second heat insulator 102 while ensuring that transmission of magnetic induction lines is in an optimal distance state.
As an example, the second area B may be disposed on two sides of the first area a, the first area a is disposed in the middle of the permanent magnet 2, in the actual use process, the second assembly portion 201 may be disposed in the first area a, the second assembly portion 201 may be disposed as an indent facing one side of the output shaft 211, so as to reduce the thickness of the permanent magnet 2 in the first area a, and the thickness of the second area B is larger than the thickness of the first area a, so that the heat of the permanent magnet 2 can be transferred to the position of the second area B, and the heat conducted from the second assembly portion 201 to the first assembly portion 1211 can be reduced, thereby further improving the secondary heat insulation effect of the second heat insulator 102 on the circuit board 3 and the magnetic sensing unit 301.
In this example, the second insulating member 102 may be provided as an insulating board made of an insulating material, such as bakelite, which may be made of PMC-T375HF, or an insulating board made of PPS.
It should be appreciated that the insulating board made of bakelite, namely, the second insulating member 102 has physical characteristics of bakelite, that is, the second insulating member 102 has characteristics of non-water absorption, non-conduction, high temperature resistance, high strength and strong insulation. Therefore, the heat of the output shaft 211 of the motor 200 and the heat from the permanent magnet 2 side are isolated as much as possible by the second heat insulating member 102, the majority of the heat is isolated from the first mounting surface 121 of the second heat insulating member 102 to the output shaft 211 side, and the minority of the heat is conducted into the second mounting surface 122 of the second heat insulating member 102 and the heat conducting cavity 4, so that the heat conducted by the output shaft 211 of the motor 200 and the permanent magnet 2 through the first heat insulating member 101 and the second heat insulating member 102 is weakened in two stages, and the temperature drift problem of the circuit board 3 and the magnetic sensing unit 301 can be weakened.
According to an embodiment of the present application, the first fitting portion 1211 is a protrusion extending toward the permanent magnet 2 side, and the second fitting portion 201 is a recess extending away from the second heat insulator 102 side;
or;
the first fitting portion 1211 is a groove extending away from the permanent magnet 2, and the second fitting portion 201 is a projection extending toward the second heat insulator 102.
As an example, if the first fitting portion 1211 is a protrusion extending toward the permanent magnet 2, the second fitting portion 201 is a groove extending away from the second heat insulating member 102, the receiving cavity 1221 may be configured as a groove toward the permanent magnet 2, and the side wall of the receiving groove may be configured as a concave structure toward the permanent magnet 2, so that the thickness of the heat insulating plate is ensured by the first fitting portion 1211 to ensure the heat insulating effect, and the volume and manufacturing cost of the second heat insulating plate are reduced, and the compactness of the structure of the motor 200 is ensured, so that the overall length of the motor 200 is not affected.
If the first fitting portion 1211 is a groove extending away from the permanent magnet 2, the second fitting portion 201 is a protrusion extending toward the second heat insulator 102, and a boss may be provided on the second mounting surface 122, such that the boss protrudes toward the circuit board 3, and the accommodating cavity 1221 is provided in the boss, so as to ensure the heat insulation effect of the accommodating cavity 1221.
Those skilled in the art may adjust the relative thickness of the second heat insulation member 102 according to actual usage conditions, and will not be described in detail herein.
Fig. 11 is a schematic diagram of a magnetic force line trend structure of a permanent magnet in a magneto-electric encoder according to a fifth embodiment of the present application. According to an embodiment of the present application, a cross section of the first fitting portion 1211 and the second fitting portion 201 along a radial direction of the output shaft 211 is circular.
Preferably, fig. 10 is a schematic diagram of a trend structure of magnetic lines of force of a permanent magnet in a magneto-electric encoder according to a fourth embodiment of the present application; the cross sections of the first assembly portion 1211 and the second assembly portion 201 along the radial direction of the output shaft 211 are rectangular, so that two parallel symmetrical sides of the second assembly portion 201 penetrate through the permanent magnet 2, and the two parallel symmetrical sides take the boundary line of two magnetic poles of the permanent magnet 2 as a symmetrical center line, so as to ensure that the magnetic force direction of the permanent magnet 2 is perpendicular to the boundary line of two magnetic poles of the permanent magnet 2, thereby further improving the measurement accuracy of the magneto-electric encoder.
Referring to fig. 6, a schematic cross-sectional structure of a second heat insulating member in a magneto-electric encoder according to a second embodiment of the present application is provided, wherein a surface area of the second mounting surface 122 is larger than a surface area of the first mounting surface 121.
According to an embodiment of the present application, the second mounting surface 122 includes a plurality of heat dissipating parts 1222, so that heat is introduced into the heat conducting cavity 4 from the first mounting surface 121 through the heat dissipating parts 1222, and the heat dissipating parts 1222 are offset from the magnetic sensing unit 301.
As an example, the heat dissipating part 1222 may be provided as a hemispherical bump toward the side of the circuit board 3, a diamond bump having sharp corners. Further, in the axial direction 400 of the output shaft, the cross section of the heat dissipating portion 1222 is wavy or zigzag, so as to increase the surface area of the second mounting surface 122 by the heat dissipating portion 1222, so as to increase the heat dissipating area of the heat dissipating portion 1222 into the heat conducting cavity 4, that is, increase the heat conducted into the heat conducting cavity 4 far from the area of the magnetic sensing unit 301, so as to avoid heat concentration on the side of the magnetic sensing unit 301, and control heat conduction on the side far from the magnetic sensing unit 301.
The heat dissipation portion 1222 improves the heat conduction effect of heat to the circumference side of the magnetic sensing unit 301, preferably, the heat conduction coefficient of the heat dissipation portion 1222 is greater than the heat conduction coefficient of the accommodating cavity 1221 or the first assembly portion 1211, so that the concentration of heat to the position of the accommodating cavity 1221 is reduced, and the conduction of heat from the second heat insulating member 102 to the magnetic sensing unit 301 is reduced, so that the temperature drift problem of the magnetic sensing unit 301 is reduced, and the accuracy of the magneto-electric encoder is further improved.
Preferably, the second heat insulating member 102 may be configured as a partition structure, so that the heat insulating material in the area where the second assembly portion 201 and/or the accommodating cavity 1221 is located has a heat insulating property for temperature better than that of other positions, thereby further reducing heat conduction to the magneto-electric sensing unit 301, and further improving the measurement accuracy of the magneto-electric encoder.
According to an embodiment of the present application, wherein according to another aspect of the present application, there is provided an electric machine 200 comprising a magneto-electric encoder as described above.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A magneto-electric encoder, comprising: the main body (1) is provided with an outer cover and an assembly cavity, and a heat insulation assembly (100), a permanent magnet (2) and a circuit board (3) are arranged in the assembly cavity;
the outer cover of the main body is assembled and connected with the shell of the motor;
the main body (1) is assembled and connected with the motor (200) through the heat insulation assembly (100);
the heat insulation assembly (100) comprises a first heat insulation member (101) and a second heat insulation member (102), wherein a first side surface (111) of the first heat insulation member (101) is assembled and connected with an output shaft (211) of the motor (200), and the permanent magnet (2) is assembled on a second side surface (112) of the first heat insulation member (101) so as to block heat conduction from the first side surface (112) to the second side surface (112) through the first heat insulation member (101);
the circuit board (3) comprises a magnetic sensing unit (301); the second heat insulation member (102) is arranged between the permanent magnet (2) and the magnetic sensing unit (301) so as to block heat conduction from the second side surface (112) to one side of the circuit board (3) through the second heat insulation member (102);
the first side surface (111) comprises a coupling part (113) to be rotationally connected with the output shaft (211) through the coupling part (113);
the second side (112) comprises a limiting part (114) so as to limit the relative displacement between the permanent magnet (2) and the first heat insulation piece (101) through the limiting part (114); the second heat insulation piece (102) comprises a first installation surface (121) and a second installation surface (122), and the first installation surface (121) is in interference fit connection with the permanent magnet (2);
the second mounting surface (122) faces the magnetic sensing unit (301), and a heat conducting cavity (4) is arranged between the second mounting surface (122) and the circuit board (3).
2. The magneto-electric encoder of claim 1, wherein the first mounting surface (121) comprises a first fitting portion (1211), the permanent magnet (2) comprises a second fitting portion (201), and the second heat insulator (102) is in a male-female fit snap-fit engagement with the permanent magnet (2) with the second fitting portion (201) through the first fitting portion (1211).
3. The magneto-electric encoder of claim 2, wherein the first fitting portion (1211) is a projection extending to a side of the permanent magnet (2), and the second fitting portion (201) is a recess extending away from a side of the second heat shield (102), or;
the first fitting part (1211) is a groove extending away from the permanent magnet (2), and the second fitting part (201) is a projection extending toward the second heat insulator (102).
4. A magneto-electric encoder according to claim 3, wherein the first fitting part (1211) and the second fitting part (201) are circular in cross section along the radial direction of the output shaft (211), or;
the first fitting portion (1211) and the second fitting portion (201) are rectangular in cross section along the radial direction of the output shaft (211).
5. The magneto-electric encoder of claim 1, wherein the second mounting surface (122) comprises a receiving cavity (1221), the magnetic sensing unit (301) being disposed within the receiving cavity (1221).
6. The magneto-electric encoder of claim 5, wherein a surface area of the second mounting surface (122) is greater than a surface area of the first mounting surface (121).
7. The magneto-electric encoder of claim 6, wherein the second mounting surface (122) comprises a plurality of heat dissipating portions (1222) to direct heat from the first mounting surface (121) into the thermally conductive cavity (4) through the heat dissipating portions (1222).
8. The magneto-electric encoder of claim 7, wherein the heat sink (1222) is offset from the magnetic sensing unit (301).
9. The magneto-electric encoder of claim 7, wherein the heat dissipating portion (1222) has a wavy or zigzag cross section in an axial direction of the output shaft (211).
10. An electric machine comprising a magneto-electric encoder according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131575.3A CN113890278B (en) | 2021-09-26 | 2021-09-26 | Magneto-electric encoder and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111131575.3A CN113890278B (en) | 2021-09-26 | 2021-09-26 | Magneto-electric encoder and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113890278A CN113890278A (en) | 2022-01-04 |
| CN113890278B true CN113890278B (en) | 2023-05-12 |
Family
ID=79006876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111131575.3A Active CN113890278B (en) | 2021-09-26 | 2021-09-26 | Magneto-electric encoder and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113890278B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19509130A1 (en) * | 1994-03-14 | 1995-09-21 | Fuji Electric Co Ltd | Servomotor of compact design with reduced axial length |
| US7466125B2 (en) * | 2004-07-12 | 2008-12-16 | Feig Electronic Gmbh | Position transmitter and method for determining a position of a rotating shaft |
| JP5447820B2 (en) * | 2009-10-19 | 2014-03-19 | 株式会社安川電機 | motor |
| EP2746730B1 (en) * | 2012-12-21 | 2015-11-18 | SICK STEGMANN GmbH | Drive system with an angle encoder |
| CN106104991B (en) * | 2014-08-01 | 2017-07-18 | 松下知识产权经营株式会社 | Motor |
| CN105628057A (en) * | 2014-10-31 | 2016-06-01 | 北京精密机电控制设备研究所 | High-temperature-resistance high-precision Hall encoder |
| CN111864999B (en) * | 2020-08-24 | 2021-07-06 | 珠海格力电器股份有限公司 | Encoder assembly, motor and system with motor |
-
2021
- 2021-09-26 CN CN202111131575.3A patent/CN113890278B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113890278A (en) | 2022-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2256908B1 (en) | Heat radiation structure of electric apparatus | |
| JP3970852B2 (en) | A device that measures the torque applied to the shaft | |
| KR970022319A (en) | Rotation sensor and its manufacturing method | |
| US4932268A (en) | Electromagnetic flow measuring arrangement | |
| KR20170017127A (en) | Sensor assembly and motor including the same | |
| US4097756A (en) | Tubular wheel speed sensor | |
| JP2012242176A (en) | Current sensor | |
| CN113890278B (en) | Magneto-electric encoder and motor | |
| US4853575A (en) | Tachometer generator | |
| JPH11153452A (en) | Rotation detector | |
| US11060931B2 (en) | Sensor device | |
| JP3329977B2 (en) | Rotational position detector | |
| JP2009198294A (en) | Rotation detection sensor | |
| CN111566449B (en) | Sensing device | |
| US4029180A (en) | Tubular wheel speed sensor for an anti-skid system | |
| JPH05126512A (en) | Angle detector | |
| KR102226672B1 (en) | Position sensor | |
| JPH0815330A (en) | Current detector | |
| JP2003139621A (en) | Temperature sensor and its fitting structure | |
| JP4647755B2 (en) | Capacitance sensor | |
| JP2012237582A (en) | Current sensor | |
| JP4028559B2 (en) | Rotation sensor | |
| JP3433120B2 (en) | Sensor device and brushless motor using the same | |
| JP4369839B2 (en) | Rotation sensor | |
| US20220376564A1 (en) | 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 |