Motor structure

Abstract

The utility model relates to a motor structure which comprises a base, a rotor assembly, an iron core assembly, a motor support, an encoder plate, an encoder magnetic sheet and a magnetic sheet support, the encoder magnetic sheet is installed on the magnetic sheet support, the motor structure further comprises a pivot bearing fixed with the base, and two bearings which are coaxially installed are arranged in the pivot bearing. Compared with the prior art, the utility model has the advantages of high assembly precision, easy operation, low vibration noise, low cost, compact structure and the like.

Description

Technical Field

[0001] The utility model relates to a motor structure. Background Art

[0002] Existing motors generally include end covers, rotor assemblies, stator assemblies, and bearings. When the bearings are coaxially installed, the bearing chamber end is preloaded, and a shoulder is required between the two bearings. Due to the influence of the shoulder, there is an inherent concentricity deviation between the two bearing chambers, and there is an unstable contact area inside the bearing, which affects the vibration noise, life and stability of the bearing.

[0003] At the same time, the preload system of the conventional motor bearing structure is subject to the limitations of multiple parts, the tolerance accumulation is large, and the preload force fluctuates greatly; there are differences in the materials of the bearing chamber and the bearing itself, and there are differences in the thermal expansion coefficients. The bearings are easily damaged and produce abnormal noise when the motor works at high and low temperatures.

[0004] In addition, the existing motor assembly process is cumbersome, the risk of bearing damage is high, and the production defect rate is high; the commonly used riveting process occupies the axial space of the motor and has low space utilization; the encoder bracket in the motor has low bonding reliability and is easy to fall off. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a motor structure with high assembly accuracy, easy operation, low vibration and noise, low cost and compact structure.

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

[0007] According to one aspect of the utility model, a motor structure is provided, including a base, a rotor assembly, an iron core assembly, a motor bracket, an encoder plate, an encoder magnetic sheet and a magnetic sheet bracket, wherein the encoder magnetic sheet is mounted on the magnetic sheet bracket, and the motor structure also includes a pivot bearing fixed to the base, and the pivot bearing has two coaxially mounted bearings built in.

[0008] As a preferred technical solution, the two bearings are coaxially installed on a rotating shaft, and the outer rings are coaxially installed in the same hole.

[0009] As a preferred technical solution, the two bearings are connected via a spacer ring.

[0010] As a preferred technical solution, the bearing and the bearing chamber or the bearing sleeve are components made of the same material, and the bearing is installed in the bearing chamber or the bearing sleeve by positioning preload or constant pressure preload.

[0011] As a preferred technical solution, the bearing housing on the pivot bearing is the mounting surface of the core assembly and is provided with at least one glue groove.

[0012] As a preferred technical solution, the bearing housing is provided with a step for positioning during the motor assembly process.

[0013] As a preferred technical solution, the pivot bearing is fixed to the base by laser welding.

[0014] As a preferred technical solution, the magnetic sheet bracket is installed inside the pivot bearing by gluing.

[0015] As a preferred technical solution, the rotor assembly is locked on the rotating shaft of the pivot bearing by means of screws.

[0016] As a preferred technical solution, an encoder chip is installed on the back of the encoder plate, and the encoder chip and the encoder magnetic sheet are installed in opposite directions;

[0017] The encoder plate is installed after the mechanical part of the motor is assembled.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] 1) The inner and outer rings of the bearing of the utility model are coaxially installed, and the position is ensured by the spacer ring to ensure the concentricity of the assembly;

[0020] 2) The bearing system (bearing, rotating shaft, bearing housing) of the utility model is made into an integrated type in the form of a pivot bearing, thereby simplifying the assembly process of the bearing system, ensuring that the bearing is not damaged during the motor assembly process, and improving the yield rate;

[0021] 3) The bearing system preload of the utility model can be very stable, and both constant pressure preload and spring system are available;

[0022] 4) The encoder magnetic sheet and magnetic sheet bracket of the utility model are glued and installed inside the pivot bearing, which saves space and improves reliability;

[0023] 5) The encoder board of the utility model is installed at the back, and the encoder chip and the magnetic sheet are installed back to back, which increases the sensing distance in a small space, ensures the magnetic field stability of the chip part, and improves the control accuracy;

[0024] 6) The utility model improves space utilization and strengthens the reliability between assembly parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the motor of the utility model;

[0026] Figure 2 This is a schematic diagram of the installation of the encoder board of the utility model;

[0027] Figure 3 This is a schematic diagram of the mechanical components of the motor of the utility model;

[0028] Figure 4 It is a structural schematic diagram of the pivot bearing and base assembly of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the pivot bearing of the utility model.

[0030] 1 is the base, 2 is the rotor assembly, 3 is the core assembly, 4 is the motor bracket, 5 is the encoder plate, 6 is the encoder magnetic sheet, 7 is the magnetic sheet bracket, 8 is the pivot bearing, and 9 is the screw;

[0031] 11 is a welding line, 51 is an encoder chip, 81 is a bearing, 82 is a spacer ring, 83 is a rotating shaft, 84 is a bearing housing, and 841 is a glue groove. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0033] like Figure 1 As shown, the utility model is a motor structure, including a base 1, a rotor assembly 2, an iron core assembly 3, a motor bracket 4, an encoder plate 5, an encoder magnetic sheet 6 and a magnetic sheet bracket 7, wherein the encoder magnetic sheet 6 is mounted on the magnetic sheet bracket 7, and the motor structure also includes a pivot bearing 8 fixed to the base 1, and the pivot bearing 8 has two coaxially mounted bearings 81 built therein, such as Figure 5 The motor bearing system shown is assembled into one piece in the form of a pivot bearing, that is, the entire assembly of parts serves as an assembly part of the motor.

[0034] The structure of the pivot bearing is as follows: the two bearings 81 are coaxially installed on a rotating shaft 83 to ensure the concentricity of the inner ring; at the same time, the outer ring is coaxially installed in the same section of the hole to ensure the concentricity of the outer ring of the bearing; the two bearings 81 are connected by a spacer 82 to ensure the relative position. The bearing 81 rings and steel balls are components made of the same material as the bearing chamber or bearing sleeve. The bearing 81 is installed in the bearing chamber or bearing sleeve by positioning preload or constant pressure preload, or preload is provided according to a conventional rated wave spring. A hexagonal wrench hole is provided on one side of the pivot assembly shaft, and a threaded hole is provided on the other side; the pivot bearing is combined into one by the above parts as an assembly component of the motor.

[0035] like Figure 3As shown, the bearing housing 84 on the pivot bearing 8 is the mounting surface of the core assembly 3, and is provided with at least one glue groove 841, preferably, three glue grooves. The bearing housing 84 is provided with a step for positioning during the motor assembly process.

[0036] like Figure 4 As shown, the pivot bearing 8 is fixed to the base 1 by laser welding, with two upper and lower welding lines 11.

[0037] like Figure 1 As shown, the magnetic sheet support 7 is mounted inside the pivot bearing 8 by gluing, which saves space and improves assembly reliability.

[0038] The rotor assembly 2 is locked on the rotating shaft 83 of the pivot bearing 8 by means of screws 9 .

[0039] As a preferred technical solution, an encoder chip 51 is installed on the back of the encoder plate 5, and the encoder chip 51 and the encoder magnetic sheet 6 are installed in a back-to-back manner, which can ensure that the magnetic induction distance is increased in a small space, ensure the magnetic field stability of the chip part, and improve the control accuracy;

[0040] like Figure 2 As shown, the encoder plate 5 is installed after the mechanical part of the motor is assembled, which reduces the difficulty of reworking the motor.

[0041] Through the above structure, the concentricity of the two bearings of the utility model is guaranteed to a great extent; the preload of the bearing system can be very stable, and both constant pressure preload and spring system can be selected; the assembly process of the bearing system is simplified to ensure that the bearings are not damaged during the motor assembly process, thereby improving the yield rate; simplifying the parts molding process, simplifying the motor production process, and reducing costs; improving space utilization and enhancing the reliability between assembly parts.

[0042] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A motor structure, comprising a base (1), a rotor assembly (2), an iron core assembly (3), a motor bracket (4), an encoder plate (5), an encoder magnetic sheet (6) and a magnetic sheet bracket (7), wherein the encoder magnetic sheet (6) is mounted on the magnetic sheet bracket (7), characterized in that: The motor structure further comprises a pivot bearing (8) fixed to the base (1), wherein the pivot bearing (8) has two coaxially mounted bearings (81) built therein.

2. A motor structure according to claim 1, characterized in that: The two bearings (81) are coaxially mounted on a rotating shaft (83), and the outer rings are coaxially mounted in the same hole.

3. A motor structure according to claim 1, characterized in that: The two bearings (81) are connected via a spacer (82).

4. A motor structure according to claim 1, characterized in that: The bearing (81) and the bearing chamber or the bearing sleeve are components made of the same material, and the bearing (81) is installed in the bearing chamber or the bearing sleeve by positioning pre-tightening or constant pressure pre-tightening.

5. The motor structure according to claim 1, characterized in that: The bearing housing (84) on the pivot bearing (8) is a mounting surface of the iron core assembly (3) and is provided with at least one glue groove (841).

6. A motor structure according to claim 5, characterized in that: The bearing housing (84) is provided with a step for positioning during the motor assembly process.

7. The motor structure according to claim 1, characterized in that: The pivot bearing (8) is fixed to the base (1) by laser welding.

8. The motor structure according to claim 1, characterized in that: The magnetic sheet support (7) is mounted inside the pivot bearing (8) by gluing.

9. The motor structure according to claim 2, characterized in that: The rotor assembly (2) is locked onto the rotating shaft (83) of the pivot bearing (8) by means of screws (9).

10. The motor structure according to claim 1, characterized in that: An encoder chip (51) is installed on the back of the encoder plate (5), and the encoder chip (51) and the encoder magnetic sheet (6) are installed in opposite directions; The encoder plate (5) is installed after the mechanical part of the motor is assembled.

Images