Flat brush motor with encoder

Abstract

The invention relates to the technical field of motors, and discloses a flat brush motor with an encoder. The motor comprises an encoder and a motor body, the encoder is arranged on the motor body, and the encoder comprises an encoder stator and an encoder rotor; the motor body comprises a bearing, an electric brush assembly, a stator assembly and a rotor assembly, the rotor assembly is arranged in the stator assembly, an air gap is formed between the rotor assembly and the stator assembly, the stator assembly and the rotor assembly are in flat design, the stator assembly comprises a stator and a casing, the stator is arranged in the casing, the rotor assembly comprises an armature and a bushing, and the armature is connected with the bushing. The bearing is arranged in the bushing, the rotor assembly is arranged on the hollow shaft of the casing, and the electric brush assembly is arranged on the stator assembly through a first connecting piece. Therefore, the problem that a traditional brush motor occupies a large installation space and has an accurate position feedback mechanism is solved.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a flat brushed motor with an encoder. Background Art

[0002] A brushed motor is a traditional DC motor that consists of a rotatable rotor and a fixed stator. Carbon brushes and commutators are used to change the direction of the current, thereby driving the rotor to rotate. Brushed motors have the characteristics of simple structure, low cost, and high starting torque, but they often lack an accurate position feedback mechanism, making it difficult to accurately control the motor.

[0003] As the current motor development technology becomes increasingly mature, higher requirements are placed on the motor's appearance size and performance indicators. In a limited volume, the size of the motor should be reduced as much as possible, that is, how to make the best use of space resources. These are the problems that exist and need to be solved in motor systems in practical applications. Summary of the invention

[0004] The invention provides a flat brushed motor with an encoder, which can solve the technical problems in the prior art.

[0005] The present invention provides a flat brushed motor with an encoder, wherein the motor comprises an encoder and a motor body, wherein the encoder is arranged on the motor body.

[0006] The encoder comprises an encoder stator and an encoder rotor;

[0007] The motor body includes a bearing, a brush assembly, a stator assembly and a rotor assembly. The rotor assembly is arranged inside the stator assembly and has an air gap between the rotor assembly and the stator assembly. The stator assembly and the rotor assembly are flat in design. The stator assembly includes a stator and a casing. The stator is arranged in the casing. The rotor assembly includes an armature and a bushing. The armature is connected to the bushing. The bearing is arranged in the bushing. The rotor assembly is arranged on a hollow shaft of the casing. The brush assembly is arranged on the stator assembly through a first connecting member.

[0008] Preferably, the lower end surface of the bearing is locked by a first locking member, and the bearing is locked on the hollow shaft of the housing by a second locking member.

[0009] Preferably, the motor body further comprises an end cover, which is arranged on one side of the motor body and connected to the stator assembly via a second connecting member.

[0010] Preferably, the encoder stator is fixedly connected to the end cover via a third connecting member, and the encoder rotor is fixedly connected to the bushing.

[0011] Preferably, the encoder rotor is fixedly connected to the bushing by adhesive, and the armature of the rotor assembly is fixedly connected to the bushing by adhesive.

[0012] Preferably, the motor further comprises an encoder cover, and the encoder cover is arranged outside the encoder through a fourth connecting member.

[0013] Preferably, the motor body further comprises a washer disposed between the rotor assembly and the casing.

[0014] Preferably, the first locking member is an outer nut, and the second locking member is an inner nut.

[0015] Preferably, the first connecting member, the second connecting member, the third connecting member and the fourth connecting member are screws.

[0016] Through the above technical solution, a flat brushed motor with an encoder can be obtained, which has the advantages of compact structure and high precision. The flat structure is adopted, and the encoder is installed on the shaft bushing of the motor body, sharing the radial dimension with the bearing, and embedded in the motor body, which can save the space of the whole motor; the encoder obtains the position and speed information of the rotor in real time, and the high-precision control of the motor can be achieved. In this way, the problem of the traditional brushed motor occupying a large installation space and the precise position feedback mechanism is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic structural diagram of a flat brushed motor with an encoder according to an embodiment of the present invention is shown;

[0019] Figure 2 Shown along Figure 1 Cross-sectional view of section AA. DETAILED DESCRIPTION

[0020] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0023] like Figure 1 and 2 As shown, an embodiment of the present invention provides a flat brushed motor with an encoder, wherein the motor comprises an encoder and a motor body, wherein the encoder is arranged on the motor body,

[0024] The encoder includes an encoder stator 6 and an encoder rotor 5;

[0025] The motor body includes a bearing 8, a brush assembly 10, a stator assembly and a rotor assembly. The rotor assembly is arranged inside the stator assembly and has an air gap between the rotor assembly and the stator assembly. The stator assembly and the rotor assembly are flat in design. The stator assembly includes a stator 16 and a casing 14. The stator 16 is arranged in the casing 14. The rotor assembly includes an armature 15 and a bushing 7. The armature 15 is connected to the bushing 7. The bearing 8 is arranged in the bushing 7. The rotor assembly is arranged on the hollow shaft of the casing 14. The brush assembly 10 is arranged on the stator assembly through a first connecting member 11.

[0026] The brushes in the brush assembly and the commutator work together to provide current to the rotor, causing it to rotate.

[0027] Through the above technical solution, a flat brushed motor with an encoder can be obtained, which has the advantages of compact structure and high precision. The flat structure is adopted, and the encoder is installed on the shaft bushing of the motor body, sharing the radial dimension with the bearing, and embedded in the motor body, which can save the space of the whole motor; the encoder obtains the position and speed information of the rotor in real time, and the high-precision control of the motor can be achieved. In this way, the problem of the traditional brushed motor occupying a large installation space and the precise position feedback mechanism is solved.

[0028] According to an embodiment of the present invention, the lower end surface of the bearing 8 is locked by a first locking member 12 , and the bearing 8 is locked on the hollow shaft of the housing 14 by a second locking member 9 .

[0029] According to an embodiment of the present invention, the motor body further comprises an end cover 2 , which is disposed on one side of the motor body and connected to the stator assembly via a second connector 17 .

[0030] That is, an end cover is installed on one side of the motor body, and the end cover is installed on the stator assembly through the second connecting member.

[0031] According to an embodiment of the present invention, the encoder stator 6 is fixedly connected to the end cover 2 via a third connecting member 1 , and the encoder rotor 5 is fixedly connected to the bushing 7 .

[0032] That is, the encoder stator can be mounted on the end cover and fixedly connected to the motor as a whole through the third connecting member. According to one embodiment of the present invention, the encoder rotor 5 is fixedly connected to the bushing 7 by adhesive, and the armature 15 of the rotor assembly is fixedly connected to the bushing 7 by adhesive.

[0033] According to an embodiment of the present invention, the motor further comprises an encoder cover 4 , and the encoder cover 4 is arranged outside the encoder through a fourth connecting member 3 .

[0034] In this way, the encoder can be protected.

[0035] According to an embodiment of the present invention, the motor body further includes a washer 13 disposed between the rotor assembly and the housing 14 .

[0036] According to an embodiment of the present invention, the first locking member 12 is an outer nut, and the second locking member 9 is an inner nut.

[0037] According to an embodiment of the present invention, the first connecting member 11, the second connecting member 17, the third connecting member 1 and the fourth connecting member 3 are screws.

[0038] In order to specifically explain the embodiment of the present invention, an example is given below.

[0039] In this example, a drone is taken as an example, and its power system adopts the flat brushed motor with encoder described in the present invention.

[0040] In practical applications, the encoder can collect the motor's rotation angle information in real time for timely feedback, and process this information through the control system to accurately control the drone's flight attitude and speed. At the same time, the flat design reduces the size and weight of the motor, making the drone more stable.

[0041] It can be seen from the above embodiments that the motor structure of the present invention combines the precise feedback of the encoder with the torque characteristics of the brushed motor to achieve precise control of the brushed motor; the flat brushed motor structure can effectively save installation space while providing torque. That is, the present invention effectively improves the control accuracy of the motor while saving the installation space.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flat brushed motor with an encoder, characterized in that: The motor comprises an encoder and a motor body, wherein the encoder is arranged on the motor body. The encoder comprises an encoder stator (6) and an encoder rotor (5); The motor body comprises a bearing (8), a brush assembly (10), a stator assembly and a rotor assembly. The rotor assembly is arranged inside the stator assembly and has an air gap with the stator assembly. The stator assembly and the rotor assembly are of flat design. The stator assembly comprises a stator (16) and a housing (14). The stator (16) is arranged in the housing (14). The rotor assembly comprises an armature (15) and a shaft liner (7). The armature (15) is connected to the shaft liner (7). The bearing (8) is arranged in the shaft liner (7). The rotor assembly is arranged on a hollow shaft of the housing (14). The brush assembly (10) is arranged on the stator assembly through a first connecting member (11).

2. The motor according to claim 1, characterized in that The lower end surface of the bearing (8) is locked by a first locking member (12), and the bearing (8) is locked on the hollow shaft of the housing (14) by a second locking member (9).

3. The motor according to claim 2, characterized in that The motor body further comprises an end cover (2), wherein the end cover (2) is arranged on one side of the motor body and the end cover (2) is connected to the stator assembly via a second connecting member (17).

4. The motor according to claim 3, characterized in that The encoder stator (6) is fixedly connected to the end cover (2) via a third connecting member (1), and the encoder rotor (5) is fixedly connected to the shaft liner (7).

5. The motor according to claim 4, characterized in that The encoder rotor (5) is fixedly connected to the shaft bushing (7) by means of adhesive, and the armature (15) of the rotor assembly is fixedly connected to the shaft bushing (7) by means of adhesive.

6. The motor according to claim 5, characterized in that The motor further comprises an encoder cover (4), wherein the encoder cover (4) is arranged outside the encoder via a fourth connecting member (3).

7. The motor according to claim 6, characterized in that The motor body also includes a washer (13) arranged between the rotor assembly and the housing (14).

8. The motor according to any one of claims 1 to 7, characterized in that: The first locking member (12) is an outer nut, and the second locking member (9) is an inner nut.

9. The motor according to any one of claims 1 to 7, characterized in that: The first connecting member (11), the second connecting member (17), the third connecting member (1) and the fourth connecting member (3) are screws.

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