An electric machine

Abstract

The utility model provides a kind of motor belongs to electrical technology field.It solves the problem of poor reliability of motor in prior art.The motor, including main shaft and the motor main body being provided with stator and being cylindrical, the rotor being fixedly connected on the main shaft and being located in the motor main body, the first annular step is formed on the rotor, bearing is also sleeved on the rotor, the limiting member is also fixed on the rotor, the inner ring of the bearing is fixed on the rotor, the outer ring of the bearing is rotatably connected with the inner wall of the motor main body, one end of the bearing is abutted on the first annular step, and the other end of the bearing is abutted on the limiting member.The utility model has the advantages of facilitating motor assembly and improving the reliability of the assembled motor.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology and relates to a motor. Background Technology

[0002] An electric motor, also known as a motor, is a device that converts electrical energy into mechanical energy. Its main function is to generate driving torque, serving as a power source for electrical appliances or various equipment. It is widely used in manufacturing, transportation, automation, and other fields.

[0003] Existing motors typically include a spindle, a rotor fixedly mounted on the spindle, a housing assembly mounted on the spindle, and a stator housed within the housing assembly. The housing assembly consists of an upper housing and a lower housing. An upper bearing is located between the upper housing and the spindle, and a lower bearing is located between the lower housing and the spindle. The inner rings of both the upper and lower bearings are interference-fitted with the spindle. The outer rings of the upper and lower bearings are mounted on the upper housing, and the outer rings of the lower bearings are mounted on the lower housing. To facilitate motor assembly, a transition fit is usually used between the outer ring of the lower bearing and the lower housing. To prevent the upper bearing from axially detaching from the housing assembly due to external forces on the spindle, the upper housing has a mounting cavity with a height matching that of the upper bearing.

[0004] However, when the spindle is subjected to a large external force, there is a risk of axial separation between the spindle and the upper bearing, which may even cause the rotor and the lower bearing on the spindle to fall downwards, affecting the normal use of the motor. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a new type of motor. The technical problem this invention aims to solve is how to facilitate motor assembly while simultaneously improving the reliability of the assembled motor.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An electric motor includes a main shaft and a cylindrical motor body with a stator. A rotor located inside the motor body is fixedly connected to the main shaft. The rotor has a first annular step, a bearing is sleeved on the rotor, and a limiting member is fixed on the rotor. The inner ring of the bearing is fixed on the rotor, and the outer ring of the bearing is rotatably engaged with the inner wall of the motor body. One end of the bearing abuts against the first annular step, and the other end of the bearing abuts against the limiting member.

[0008] This motor adds a first annular step and a limiting component to the rotor. During assembly, the bearing and the limiting component are simply sleeved and fixed onto the rotor in sequence. At the same time, the first annular step and the limiting component abut against both ends of the bearing, so that the first annular step and the limiting component can jointly limit the axial movement of the bearing, thereby preventing the bearing from moving axially during the use of the motor. This not only facilitates the assembly of the motor, but also improves the reliability of the motor after assembly.

[0009] In one type of motor described above, an encoder located outside the retaining ring is also sleeved on the main shaft, and the encoder is fixedly connected to the motor body. The encoder provides the motor system with the ability to "sense" its own motion state, thereby upgrading the simple "open-loop drive" to intelligent "closed-loop control". At the same time, after the encoder is connected to the motor body, it can also play a limiting role, further preventing axial movement of the bearing and improving the reliability of the motor after assembly.

[0010] In one type of motor described above, the rotor also has a second annular step. The distance between the second annular step and the first annular step matches the thickness of the bearing. The limiting member is a snap ring or a retaining ring, which abuts against the second annular step. This allows the first annular step and the limiting member to better work together to limit the axial movement of the bearing, while also allowing the user to select a snap ring or a retaining ring according to actual conditions.

[0011] In one type of motor described above, a bushing is also fitted and fixed to the end of the main shaft away from the bearing. The bushing, together with the bearing, can better support the main shaft and allow the rotor to rotate more effectively relative to the motor body.

[0012] In the aforementioned type of motor, the bearing and rotor are interference-fitted. This further prevents axial movement of the bearing and improves the reliability of the motor after assembly.

[0013] Compared with existing technologies, the advantages of this motor are as follows: This motor adds a first annular step and a limiting component to the rotor. During assembly, the bearing and the limiting component are simply sleeved and fixed onto the rotor in sequence. At the same time, the first annular step and the limiting component abut against both ends of the bearing, so that the first annular step and the limiting component can jointly limit the axial movement of the bearing, thereby preventing the bearing from moving axially during the use of the motor. This not only facilitates the assembly of the motor, but also improves the reliability of the motor after assembly. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the motor (excluding the casing).

[0015] Figure 2 This is an exploded view of the motor (excluding the casing).

[0016] In the diagram, 1 is the main shaft; 2 is the motor body; 3 is the rotor; 3a is the first annular step; 3b is the second annular step; 4 is the bearing; 5 is the limiting component; 6 is the encoder; and 7 is the bushing. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] A type of motor, reference Figure 1 and Figure 2 The motor body includes a main shaft 1 and a cylindrical motor body 2 with a stator. A rotor 3 located inside the motor body 2 is fixedly connected to the main shaft 1. The rotor 3 has a first annular step 3a. A bearing 4 is also sleeved on the rotor 3. A limiting member 5 is also fixed on the rotor 3. The inner ring of the bearing 4 is fixed on the rotor 3. The outer ring of the bearing 4 is rotatably engaged with the inner wall of the motor body 2. One end of the bearing 4 abuts against the first annular step 3a, and the other end of the bearing 4 abuts against the limiting member 5.

[0019] Reference Figure 1 and Figure 2 Furthermore, an encoder 6 located outside the limiting member 5 is also sleeved on the main shaft 1, and the encoder 6 is fixedly connected to the motor body 2.

[0020] In this embodiment, the rotor 3 preferably also has a second annular step 3b, the distance between the second annular step 3b and the first annular step 3a is matched with the thickness of the bearing 4, and the limiting member 5 is a snap ring or retaining ring and abuts against the second annular step 3b; preferably, a bushing 7 is also sleeved and fixed on the end of the main shaft 1 away from the bearing 4; preferably, the bearing 4 and the rotor 3 are interference fit.

[0021] During assembly, first, the bushing 7 is installed into the housing (not shown in the housing diagram). Then, the motor body 2 is fixed to the housing with screws. Next, the bearing 4 is fitted onto the rotor 3 and secured to it using a limiting member 5 (circlip or retaining ring). One end of the bearing 4 abuts against the first annular step 3a, and the other end abuts against the limiting member 5. Then, the assembled rotor 3 is installed onto the main shaft 1 and inserted into the motor body 2. Finally, the encoder 6 is fitted onto the main shaft 1 and fixedly connected to the motor body 2. The main shaft 1 is rotatably connected to the motor body 2 via the bearing 4 on the rotor 3, reducing the gap between the main shaft 1 and the motor body 2.

[0022] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An electric motor, comprising a main shaft (1) and a cylindrical motor body (2) having a stator, wherein a rotor (3) is fixedly connected to the main shaft (1) and located inside the motor body (2), characterized in that, The rotor (3) has a first annular step (3a), and a bearing (4) is also sleeved on the rotor (3). A limiting member (5) is also fixed on the rotor (3). The inner ring of the bearing (4) is fixed on the rotor (3), and the outer ring of the bearing (4) is rotatably engaged with the inner wall of the motor body (2). One end of the bearing (4) abuts against the first annular step (3a), and the other end of the bearing (4) abuts against the limiting member (5).

2. The motor according to claim 1, characterized in that, An encoder (6) located outside the limiting member (5) is also sleeved on the main shaft (1), and the encoder (6) is fixedly connected to the motor body (2).

3. A motor according to claim 1 or 2, characterized in that, The rotor (3) also has a second annular step (3b), the distance between the second annular step (3b) and the first annular step (3a) is matched with the thickness of the bearing (4), and the limiting member (5) is a snap ring or retaining ring and abuts against the second annular step (3b).

4. A motor according to claim 1 or 2, characterized in that, A bushing (7) is also fitted and fixed on the end of the main shaft (1) away from the bearing (4).

5. A motor according to claim 1 or 2, characterized in that, The bearing (4) and the rotor (3) are interference-fitted.

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