CN211183722U

CN211183722U - Magnetic encoder and motor

Info

Publication number: CN211183722U
Application number: CN201922056048.5U
Authority: CN
Inventors: 江爱国; 刘海平; 张继生; 吕炳; 桂冬冬; 李留榜; 马光旭
Original assignee: Hangzhou Weiguang Electronic Co Ltd
Current assignee: Hangzhou Weiguang Electronic Co Ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2020-08-04
Anticipated expiration: 2029-11-25

Abstract

The application relates to a magnetic encoder and motor, magnetic encoder includes: the device comprises a shell, a first fixing piece and a second fixing piece, wherein one end of the shell is an opening, and the other end of the shell is a bottom surface; the circuit board is arranged at one end of the opening of the shell, covers the opening of the shell and is matched with the shell to form an accommodating cavity; and the magnetic induction component is arranged in the accommodating cavity. The motor includes: a magnetic encoder; the magnetic encoder is arranged at one end of the end cover; the rotating shaft penetrates through the end cover, extends into the accommodating cavity of the magnetic encoder and is located in the induction range of the magnetic induction assembly. The method is used for solving the problems in the prior art. The encoder is installed on the shaft end face of the measured rotating shaft, and the installation mode cannot meet the requirement of the hollow rotating shaft.

Description

Magnetic encoder and motor

Technical Field

The application relates to the technical field of electromechanics, in particular to a magnetic encoder and a motor.

Background

The magnetic encoder has the advantages of simple structure, high-speed rotation response speed and no influence of oil stains, dust and structures, and is widely applied to angle measurement in the fields of industry, military, aviation, navigation, communication and the like.

At present, a magnetic encoder is generally in-axis measurement when applied to absolute angle measurement, the encoder is required to be installed on the shaft end face of a measured rotating shaft, and the installation mode cannot meet the requirement of a hollow rotating shaft.

SUMMERY OF THE UTILITY MODEL

The object of the application is to provide a magnetic encoder and a motor, which solve the prior art. The encoder is installed on the shaft end face of the measured rotating shaft, and the installation mode cannot meet the requirement of the hollow rotating shaft.

To achieve the above object, in a first aspect, an embodiment provides a magnetic encoder, including: the device comprises a shell, a first fixing piece and a second fixing piece, wherein one end of the shell is an opening, and the other end of the shell is a bottom surface; the circuit board is arranged at one end of the opening of the shell, covers the opening of the shell and is matched with the shell to form an accommodating cavity; and the magnetic induction component is arranged in the accommodating cavity.

In an alternative embodiment, the housing comprises: a supporting part, the first end of which is connected with the circuit board and is used for supporting the circuit board; the base is connected to the second end of the supporting part, and the base is provided with a shaft hole.

In an alternative embodiment, the method further comprises: and the communication interface is connected with the circuit board and arranged on the supporting part circuit board.

In an alternative embodiment, the support portion comprises: and the limiting groove is arranged on the supporting part.

In an alternative embodiment, the magnetically inductive assembly comprises: the magnetic inductor is arranged in the accommodating cavity and is connected with the circuit board; the induction magnetic head is electrically connected with the magnetic inductor; the inductive magnetic head is arranged in the accommodating cavity and is positioned at the shaft hole.

In an alternative embodiment, the magnetic sensor is a hall magnetic sensor.

In an alternative embodiment, the method further comprises: and the zero setting interface is connected with the circuit board and arranged on the supporting part.

In a second aspect, embodiments provide an electric machine comprising: a magnetic encoder as in any one of the preceding embodiments; the magnetic encoder is arranged at one end of the end cover; the rotating shaft penetrates through the end cover, extends into the accommodating cavity of the magnetic encoder and is located in the induction range of the magnetic induction assembly.

In an alternative embodiment, the end cap comprises: the annular bulge is arranged on one end face, in contact with the magnetic encoder, of the end cover and forms an installation groove; the magnetic encoder is installed in the installation groove.

In an alternative embodiment, a screw hole is provided in the mounting groove, and the magnetic encoder is mounted in the mounting groove through the screw hole.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

Fig. 1 is a schematic structural diagram of an electric machine according to an embodiment of the present application;

FIG. 2 is a top view of the motor shown in FIG. 1;

FIG. 3 is a cross-sectional view of a magnetic encoder provided in an embodiment of the present application;

FIG. 4 is a cross-sectional view of another magnetic encoder provided in an embodiment of the present application.

Icon: motor 1, magnetic encoder 2, spacing groove 21, end cover 3, pivot 4, arch 5, casing 6, supporting part 61, base 62, circuit board 7, shaft hole 8 hold chamber 9, inductive magnetic head 10, communication interface 11, zero setting interface 12.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in 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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Fig. 1 is a schematic structural diagram of a motor 1 according to an embodiment of the present application, including: magnetic encoder 2, end cap 3. Wherein the magnetic encoder 2 is arranged at one end of the end cap 3.

In one embodiment, the end cover 3 is provided with a protrusion 5 on an end surface contacting with the magnetic encoder 2, the protrusion 5 and the end cover 3 form a mounting groove, and the magnetic encoder 2 is mounted in the mounting groove.

In the implementation process, the shape surrounded by the protrusion 5 can be consistent with the shape of the magnetic encoder 2, so that when the magnetic encoder 2 is installed in the installation groove, the magnetic encoder 2 is tightly matched with the protrusion 5 to prevent the magnetic encoder 2 from generating displacement and falling. The application provides an annular arch 5 of preferred, because need rotate when 2 installation of magnetic encoder, further for the rotation of cooperation magnetic encoder 2, protruding 5 sets up to annular arch 5 to cooperation magnetic encoder 2.

Fig. 2 is a top view of the motor shown in fig. 1. Be equipped with the screw in the mounting groove, be equipped with spacing groove 21 on the magnetic encoder 2, magnetic encoder 2 passes through spacing groove 21 and screw cooperation, fixes in the mounting groove.

In the implementation process, because the motor 1 can vibrate during operation, and the magnetic encoder 2 and the motor 1 are not integrally formed, in order to prevent the magnetic encoder 2 and the motor 1 from generating displacement or rotation due to resonance, thereby affecting the detection accuracy, the magnetic encoder 2 needs to be fixed relative to the motor 1.

Different motors 1 are arranged at different positions of the screw holes on the end cover 3, so that the magnetic encoder 2 is provided with a limiting groove 21 so as to be conveniently arranged on the motors 1 of different models.

Fig. 3 is a cross-sectional view of a magnetic encoder 2 according to an embodiment of the present application. The magnetic encoder includes: a housing 6, a circuit board 7 and a magnetically inductive component.

In the implementation process, the magnetic encoder 2 is used for detecting physical parameters such as current, position, direction and the like of the motor 1.

In one embodiment, the magnetic encoder 2 can set the number of UVW poles, the physical meaning of U: the voltage is called a potential difference or a potential difference, and is a physical quantity that measures an energy difference of a unit charge in an electrostatic field due to a difference in potential. The magnitude of the voltage is equal to the work of the unit positive charge moving from the point a to the point b under the action of the electric field force, and the direction of the voltage is defined as the direction from the high potential to the low potential. The physical significance of V: if a current of one ampere flows on a uniform wire with constant temperature and width, the resistance of the wire can convert the electric energy into the heat energy within a certain distance. The voltage difference between this distance is defined as one volt. The physical significance of W: the electric power represents the physical quantity of the current working speed, and the magnitude of the power of an electric appliance is numerically equal to the electric energy consumed by the electric appliance within 1 second. The number of poles may be any value between 1 and 32.

In the above implementation, each pair of poles of the motor 1 produces a periodic sine-cosine signal and is converted to an orthogonal or serial position signal, which is detected by the magnetic encoder 2. In an embodiment, the components of the magnetic encoder 2 for detecting the signal are a magnetic sensor and an inductive magnetic head 10, and the magnetic sensor is electrically connected to the inductive magnetic head 10. The inductive magnetic head 10 induces a change in the magnetic pole of the shaft 4 of the motor 1 and generates a signal that is sent to the magnetic sensor.

In one embodiment, the inductive magnetic head 10 itself has a sensing width, and it can be understood that the farther the sensing width is from the center of the circle on the sensing circle, the smaller the rotation angle corresponding to the arc coinciding with the sensing width, so the larger the distance between the inductive magnetic head 10 and the rotation shaft 4, the smaller the sensing error.

In the above implementation process, the motor 1 is disposed off-axis in cooperation with the inductive magnetic head 10, and in an embodiment, the rotating shaft 4 of the motor 1 passes through the end cap 3, extends into the accommodating cavity 9, and is located in an inductive range of the inductive magnetic head 10.

In the above implementation process, since the magnetic encoder 2 is disposed on one end face of the end cap 3, in order to save the assembly space, it is necessary to provide a space for placing the inductive magnetic head 10 and the rotating shaft 4 in the housing 6, so that the accommodating cavity 9 is correspondingly disposed in the housing 6. In one embodiment, the housing 6 is composed of a support portion 61 and a base 62. The first end of the support portion 61 is connected to the circuit board 7 for supporting the circuit board 7. The base 62 is connected to the second end of the supporting portion 61, and the base 62 is provided with a shaft hole 8.

In one embodiment, the circuit board 7 is disposed on the housing 6, and cooperates with the housing 6 to form the accommodating cavity 9. The magnetic induction component is arranged on the circuit board 7 and is accommodated in the accommodating cavity 9. The magnetic induction assembly comprises a magnetic inductor and an induction magnetic head 10, wherein the induction magnetic head 10 is electrically connected with the magnetic inductor.

In the above implementation process, the base 62 is disposed on the end cover 3 and is provided with the shaft hole 8 corresponding to the rotating shaft 4, and in order to prevent the rotating shaft 4 from contacting the circuit board 7, a supporting portion 61 is disposed to dispose the circuit board 7 at a position away from the rotating shaft 4.

In one embodiment, the inductive magnetic head 10 is disposed in the receiving cavity 9 and located at the axial hole 8.

In the above-mentioned realization process, pivot 4 passes through shaft hole 8 and stretches into and hold chamber 9, for making response magnetic head 10 be close to pivot 4 and be convenient for detect data, sets up shaft hole 8 at pivot 4 periphery, and shaft hole 8 can set up to the annular boss to holding the inside extension in chamber 9, and response magnetic head 10 sets up on annular boss.

In one embodiment, the limiting groove 21 is disposed on the supporting portion 61. The magnetic encoder 2 is installed in the mounting groove, and the limiting groove 21 corresponds to the screw hole in the mounting groove, and the bolt passes through the limiting groove 21 and is inserted into the screw hole for fixation. Since the magnetic encoder 2 needs to rotate, the stopper groove 21 may have a certain curvature in the longitudinal direction in order to match the rotation of the magnetic encoder 2.

Fig. 4 is a cross-sectional view of another magnetic encoder 2 according to an embodiment of the present disclosure, where the magnetic encoder 2 is further provided with a communication interface 11. The communication interface 11 is electrically connected to the circuit board 7 and disposed on the supporting portion circuit board 7.

In the implementation process, the communication interface 11 can be used for sending data detected by the magnetic encoder 2 to an external device and receiving an instruction sent by the external device to the magnetic encoder 2.

In one embodiment, the magnetic encoder 2 is further provided with a zeroing interface 12. The zeroing interface 12 is connected to the circuit board 7 and is disposed on the support portion 61.

In the implementation process, the zero setting interface 12 can set any position where the rotating shaft 4 is located at any time to be a zero position, so that the rotating shaft 4 is prevented from rotating by an angle or the magnetic encoder 2 is prevented from manually adjusting the zero position.

The magnetic encoder 2 is internally provided with an EEPROM (Electrically Erasable Programmable read only memory), can be used for setting a detected zero position, the zero position refers to setting any angle position of a rotor rotating shaft 4 of the motor 1 to be 0 degree, and can also be used for setting a rotating direction and ABZ output resolution, an AB phase is a pulse output signal, a Z phase is a circle number, the AB phase has a 90-degree difference, the rotating direction is judged according to whether A leads B or lags B, and the output resolution can be any value from 1 to 4096 ppr.

In one embodiment, the magnetic sensor is a hall magnetic sensor.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A magnetic encoder, comprising:

the device comprises a shell, a first fixing piece and a second fixing piece, wherein one end of the shell is an opening, and the other end of the shell is a bottom surface;

the circuit board is arranged at one end of the opening of the shell, covers the opening of the shell and is matched with the shell to form an accommodating cavity;

and the magnetic induction component is arranged in the accommodating cavity.

2. The magnetic encoder of claim 1, wherein the housing comprises:

the first end of the supporting part is connected with the circuit board and is used for supporting the circuit board;

the base is connected to the second end of the supporting part, and the shaft hole is formed in the base.

3. The magnetic encoder of claim 2, further comprising:

and the communication interface is connected with the circuit board and arranged on the supporting part.

4. The magnetic encoder of claim 2, wherein the support portion comprises:

and the limiting groove is arranged on the supporting part.

5. The magnetic encoder of claim 2, wherein the magnetic induction assembly comprises:

the magnetic inductor is arranged in the accommodating cavity and is connected with the circuit board;

the induction magnetic head is electrically connected with the magnetic inductor; the induction magnetic head is arranged in the accommodating cavity and is positioned at the shaft hole.

6. The magnetic encoder according to claim 5, wherein the magnetic sensor is a Hall magnetic sensor.

7. The magnetic encoder of claim 2, further comprising:

and the zero setting interface is connected with the circuit board and arranged on the supporting part.

8. An electric machine, comprising:

a magnetic encoder according to any one of claims 1 to 7;

the end cover is arranged at one end of the magnetic encoder;

and the rotating shaft penetrates through the end cover, extends into the accommodating cavity of the magnetic encoder and is positioned in the induction range of the magnetic induction component.

9. The electric machine of claim 8, wherein the end cap comprises:

the annular bulge is arranged on one end face, in contact with the magnetic encoder, of the end cover and forms an installation groove;

the magnetic encoder is installed in the installation groove.

10. The electric machine of claim 9, wherein a screw hole is provided in the mounting groove, and the magnetic encoder is mounted in the mounting groove through the screw hole.