Torque motor

Abstract

The utility model discloses a torque motor, which comprises a base, a stator assembly, a rotor assembly, at least one bearing body, an encoder and a reading head, the stator assembly is positioned on the base; the rotor assembly and the stator assembly are coaxially arranged, the rotor assembly rotates relative to the stator assembly, and the rotor assembly is provided with at least one roller groove; the bearing body comprises a roller and a bearing outer ring, the roller is matched between the roller groove and the inner wall of the bearing outer ring, and the outer wall of the bearing outer ring is positioned on the base; the encoder is connected to the rotor assembly; the reading head is connected to the base. According to the utility model, the bearing body and the rotor assembly are integrated to form the bearing, and the integrated design can avoid the problems in the bearing installation process, reduce the accumulative error, and avoid the precision loss caused by the assembly error between the bearing and the rotor assembly; and meanwhile, the integrated rotor assembly and the bearing body can enable the torque motor to achieve higher rigidity, the structure of the torque motor can be simplified, and the high-precision application requirement can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially relates to a torque motor. BACKGROUND

[0002] At present, the torque motor on the market is basically separated design of bearing and motor body. The main types of torque motor have outer rotor torque motor and inner rotor torque motor. The feature of outer rotor torque motor is that the rotor is located outside the motor, and the stator is located inside. The feature of inner rotor torque motor is that the rotor is located inside the motor, and the stator is arranged around the rotor. In the torque motor, the bearing is usually used to support the rotor of the motor, to ensure that it can rotate smoothly and accurately. In the outer rotor torque motor, the rotor is the external part of the motor, and the bearing directly supports this external rotor. In the inner rotor torque motor, the rotor is located inside the motor, and the bearing supports the internal rotor.

[0003] The radial runout and axial runout of the torque motor are important indicators to measure the performance of the motor, which reflect the movement of the rotating parts of the motor in the horizontal and vertical directions during operation. The manufacturing and installation accuracy of the bearing has a direct impact on the radial runout and end face runout of the motor. The torque motor bearing and the motor body are designed in a separated manner, and the bearing may encounter the following problems during motor assembly: 1) bearing damage: the bearing may be damaged during assembly due to improper operation, such as bumping and scratching; 2) improper assembly: if the inner ring or outer ring of the bearing is biased due to uneven force on the bearing end face during assembly, it may cause deformation or damage to the bearing; 3) pressing process problem: pressing is used in motor assembly, and the pressing force may be unstable and the pressing depth may be inaccurate during pressing. The above problems will cause cumulative error, and the cumulative error will eventually cause the bearing and the rotor to have different degrees of precision loss, resulting in precision loss of the radial runout and end face runout of the torque motor. SUMMARY

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a torque motor.

[0005] In order to achieve the above purpose, the technical scheme provided by an embodiment of the utility model is as follows:

[0006] A torque motor comprises:

[0007] a base;

[0008] a stator assembly positioned on the base;

[0009] a rotor assembly coaxially arranged with the stator assembly and rotating relative to the stator assembly, the rotor assembly being provided with at least one roller groove;

[0010] at least one bearing body comprising a roller and a bearing outer ring, the roller being fitted between the roller groove and an inner wall of the bearing outer ring, an outer wall of the bearing outer ring being positioned at the base;

[0011] an encoder connected to the rotor assembly;

[0012] a reading head connected to the base.

[0013] As a further improvement of the utility model, the rotor assembly comprises a rotating disc and a rotor yoke connected in sequence and a plurality of first permanent magnets installed on the inner wall of the rotor yoke, the rotor yoke is arranged on the outer periphery of the stator assembly, and the encoder is connected to the rotating disc.

[0014] As a further improvement of the utility model, the rotating disc and the rotor yoke are connected through a first screw.

[0015] As a further improvement of the utility model, a hollow bearing seat is fixed on the base, the outer wall of the bearing outer ring is fixed on the inner wall of the bearing seat, and the stator assembly is fixed on the outer wall of the bearing seat.

[0016] As a further improvement of the utility model, the rotating disc comprises a rotating disc body and an encoder fixing part connected in sequence, the upper portion of the rotating disc body is connected to the rotor yoke, the roller groove is arranged on the lower portion of the rotating disc body, the lower portion of the rotating disc body and the encoder fixing part are located in the bearing seat, and the encoder is connected to one side of the encoder fixing part facing the base.

[0017] As a further improvement of the utility model, the rotating disc body and the encoder fixing part are connected through a second screw; or

[0018] The rotating disc body and the encoder fixing part are integrally connected.

[0019] As a further improvement of the utility model, the rotor assembly comprises a single rotating disc part and a plurality of second permanent magnets installed on the single rotating disc part, the upper portion of the stator assembly is located on the outer periphery of the plurality of second permanent magnets, the lower portion of the stator assembly is positioned on the base, and the encoder is connected to one side of the single rotating disc part facing the base.

[0020] As a further improvement of the utility model, a hollow support seat is fixed on the base, and the outer wall of the bearing outer ring is fixed on the inner wall of the support seat.

[0021] As a further improvement of the utility model, the support seat is located in the stator assembly and is coaxially arranged with the stator assembly.

[0022] The utility model discloses a beneficial effect is:

[0023] The utility model discloses a bearing body and rotor assembly make the integrated bearing, the integrated design can avoid the problem in bearing installation process, has reduced the cumulative error, avoided the precision loss due to the assembly error between bearing and rotor assembly, and the integrated rotor assembly and bearing body can make the torque motor reach higher rigidity, can simplify the structure of torque motor, and this is helpful to realize the application requirement of high accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the person in the art better understand the technical scheme in the utility model, the following will be to the embodiment or prior art description needed to use the drawing briefly introduce, obviously, the following description in the drawing is only some embodiments in the utility model, for the person skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0025] Figure 1 It is the structure schematic view of preferred embodiment one of the utility model;

[0026] Figure 2 It is the sectional view of preferred embodiment one of the utility model;

[0027] Figure 3 It is the structure schematic view of preferred embodiment two of the utility model;

[0028] Figure 4 It is the sectional view of preferred embodiment two of the utility model;

[0029] In the drawing: 1, base, 11, bearing seat, 12, support seat, 2, stator assembly, 3, rotor assembly, 31, roller groove, 32, turntable, 321, turntable body, 322, encoder fixing piece, 33, rotor yoke, 34, first permanent magnet, 35, single turntable piece, 36, second permanent magnet, 4, bearing body, 41, roller, 42, bearing outer ring, 5, encoder, 6, reading head. DETAILED DESCRIPTION

[0030] In order to make the person in the art better understand the technical scheme in the utility model, the following will be to the embodiment or prior art description needed to use the drawing briefly introduce, obviously, the following description in the drawing is only some embodiments in the utility model, for the person skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0031] Embodiment one

[0032] Please refer to Figure 1 、 Figure 2 The embodiment of the present application discloses a torque motor, comprising a base 1, a stator assembly 2, a rotor assembly 3, at least one bearing body 4, an encoder 5 and a reading head 6. The stator assembly 2 is positioned on the base 1, and the stator assembly 2 is fixed by the base 1 to achieve the stability of the stator assembly 2. The rotor assembly 3 is coaxially arranged with the stator assembly 2 and rotates relative to the stator assembly 2, and the rotor assembly 3 is provided with at least one roller groove 31. The bearing body 4 comprises a roller 41 and a bearing outer ring 42, the roller 41 is matched between the roller groove 31 and the inner wall of the bearing outer ring 42, and the outer wall of the bearing outer ring 42 is positioned on the base 1. At this time, a part of the rotor assembly 3 serves as a bearing inner ring, so that the rotor assembly 3 and the bearing body 4 cooperate to form a bearing. The encoder 5 is connected to the rotor assembly 3, and when the rotor assembly 3 rotates, the rotation angle of the rotor assembly 3 is collected through the encoder 5. The reading head 6 is connected to the base 1 and is used in cooperation with the encoder 5 to read the angle value of the rotor assembly 3. At this time, the torque motor is an outer rotor torque motor.

[0033] In the embodiment, the type of the roller groove 31 is used to assemble the roller 41 so that the rotor assembly 3, the roller 41 and the bearing outer ring 42 constitute a single row cylindrical roller bearing. It can be understood that it is not limited to constitute a single row cylindrical roller bearing, and can also constitute a single row deep groove ball bearing, a tapered roller bearing, a thrust angular contact ball bearing, a thrust ball bearing and the like according to different requirements. In the embodiment, the number of the roller groove 31 and the bearing body 4 is one. It can be understood that in some other embodiments, the number of the roller groove 31 and the bearing body 4 can be set according to actual requirements, such as two or more, which is not limited herein.

[0034] In the embodiment, the rotor assembly 3 comprises an upper and lower connected rotating disc 32 and rotor yoke 33, and a plurality of first permanent magnets 34 mounted on the inner side wall of the rotor yoke 33, the rotor yoke 33 is arranged on the outer periphery of the stator assembly 2, and the encoder 5 is connected to the rotating disc 32.

[0035] In order to ensure the stability of the connection between the rotating disc 32 and the rotor yoke 33, it is preferred that the rotating disc 32 and the rotor yoke 33 are connected by first screws (not shown in the figure).

[0036] In the embodiment, the base 1 is fixed with a hollow bearing seat 11, the outer wall of the bearing outer ring 42 is fixed on the inner side wall of the bearing seat 11, and the stator assembly 2 is fixed on the outer side wall of the bearing seat 11. At this time, the bearing outer ring 42, the bearing seat 11 and the stator assembly 2 are coaxially arranged, and the bearing outer ring 42, the bearing seat 11 and the stator assembly 2 are connected together.

[0037] In the embodiment, the rotating disc 32 comprises a rotating disc body 321 and an encoder fixing member 322 connected in sequence, the upper part of the rotating disc body 321 is connected to the rotor yoke 33, the roller groove 31 is arranged at the lower part of the rotating disc body 321, the lower part of the rotating disc body 321 and the encoder fixing member 322 are located in the bearing seat 11, and the encoder 5 is connected to the side of the encoder fixing member 322 facing the base 1.

[0038] In the embodiment, the rotating disc body 321 and the encoder fixing member 322 are connected by a second screw (not shown in the figure). At this time, the rotating disc body 321 and the encoder fixing member 322 are arranged as two parts. It can be understood that in other embodiments, the rotating disc body 321 and the encoder fixing member 322 are integrally connected, that is, the rotating disc body 321 and the encoder fixing member 322 are arranged as one part, as long as the connection with the rotor yoke 33, the arrangement of the roller groove 31 and the fixing of the encoder 5 can be realized, which is not limited here.

[0039] Since the rotating disc body 321, the rotor yoke 33 and the encoder fixing member 322 are machined by a CNC device or finished by a grinding machine, the accuracy requirements of the flatness and perpendicularity of each part can be guaranteed. The rotating disc body 321 can be machined by a CNC device to complete the type of the roller groove 31 corresponding to the required bearing type, so that the accuracy requirements of the bearing inner ring can be guaranteed. Only the rollers 41 and the bearing outer rings 42 need to be assembled, and the bearing inner rings do not need to be installed, which reduces the assembly error and greatly improves the installation accuracy.

[0040] Embodiment two

[0041] Please refer to Figure 3 , Figure 4 The difference between the second embodiment and the first embodiment is that the rotor assembly 3 comprises a single rotating disc part 35, a plurality of second permanent magnets 36 mounted on the single rotating disc part 35, the upper part of the stator assembly 2 is located at the outer periphery of the plurality of second permanent magnets 36, the lower part of the stator assembly 2 is positioned in the base 1, and the encoder 5 is connected to the side of the single rotating disc part 35 facing the base 1. At this time, the torque motor is an inner rotor torque motor.

[0042] In the embodiment, the base 1 is fixed with a support seat 12 which is hollow inside, and the outer wall of the bearing outer ring 42 is fixed to the inner side wall of the support seat 12, thereby improving the stability of the support of the bearing outer ring 42. Further, the support seat 12 is located in the stator assembly 2 and is arranged coaxially with the stator assembly 2.

[0043] It can be understood that the single turntable piece 35 can also be split into two or more parts, and the two or more parts are fixedly connected by screws or other fixing members, as long as the two or more parts can be matched with the plurality of second permanent magnets 36 to rotate relative to the stator assembly 2, the roller groove 31 and the fixed encoder 5 can be provided, which is not limited herein.

[0044] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims. Any reference signs in the claims should not be considered as limiting the claims involved.

[0045] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A torque motor, characterized in that: include: base; a stator assembly, the stator assembly being positioned on the base; a rotor assembly, the rotor assembly being coaxially arranged with the stator assembly and rotating relative to the stator assembly, the rotor assembly being provided with at least one roller groove; at least one bearing body, the bearing body comprising a roller and a bearing outer ring, the roller being fitted between the roller groove and the inner wall of the bearing outer ring, the outer wall of the bearing outer ring being positioned on the base; an encoder connected to the rotor assembly; The reading head is connected to the base.

2. A torque motor according to claim 1, characterized in that: The rotor assembly includes a turntable and a rotor yoke connected up and down, and a plurality of first permanent magnets installed on the inner side wall of the rotor yoke. The rotor yoke is arranged on the outer periphery of the stator assembly, and the encoder is connected to the turntable.

3. A torque motor according to claim 2, characterized in that: The turntable and the rotor yoke are connected via a first screw.

4. A torque motor according to claim 2, characterized in that: A bearing seat with a hollow interior is fixed on the base, the outer wall of the bearing outer ring is fixed to the inner side wall of the bearing seat, and the stator assembly is fixed to the outer side wall of the bearing seat.

5. The torque motor according to claim 4, characterized in that: The turntable includes a turntable body and an encoder fixing part connected upper and lower. The upper part of the turntable body is connected to the rotor yoke, and the roller groove is provided at the lower part of the turntable body. The lower part of the turntable body and the encoder fixing part are both located in the bearing seat, and the encoder is connected to the side of the encoder fixing part facing the base.

6. The torque motor according to claim 5, characterized in that: The turntable body and the encoder fixing member are connected by a second screw; or The turntable body and the encoder fixing member are integrally formed and connected.

7. The torque motor according to claim 1, characterized in that: The rotor assembly includes a single turntable and a plurality of second permanent magnets mounted on the single turntable. The upper portion of the stator assembly is located on the periphery of the plurality of second permanent magnets, the lower portion of the stator assembly is positioned on the base, and the encoder is connected to a side of the single turntable facing the base.

8. The torque motor according to claim 7, characterized in that: A support seat with a hollow interior is fixed on the base, and the outer wall of the bearing outer ring is fixed to the inner side wall of the support seat.

9. The torque motor according to claim 8, characterized in that: The support seat is located in the stator assembly and is coaxially arranged with the stator assembly.

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