Auxiliary installation structure of permanent magnet synchronous torque motor

Abstract

The utility model provides an auxiliary mounting structure of a permanent magnet synchronous torque motor, which relates to the technical field of machine tool spindles and comprises a permanent magnet synchronous torque motor spindle assembly and a guide shaft. The main shaft assembly comprises a motor stator assembly, a motor rotor assembly, a rear bearing seat and a shaft core assembly; the motor stator assembly is in clearance fit with the rear bearing seat through H8 / f7, the motor stator assembly is fixedly connected with the end face of the rear bearing seat in a threaded mode, and the motor rotor assembly is in H6 / p5 interference fit with the shaft core assembly. The guide shaft is of a through hole shaft structure, an inner hole of the guide shaft and the outer circle of the shaft core assembly form H6 / h5 clearance fit, and the outer circle of the guide shaft and an inner hole of the rear bearing seat form H6 / h5 clearance fit. Only one jig is needed when the permanent magnet synchronous torque motor is installed on the main shaft, and assembling is easy and fast. The jig is simple in structure and easy to machine, and the structural characteristics of the jig are suitable for various permanent magnet synchronous torque motor spindles.

Description

An auxiliary mounting structure for a permanent magnet synchronous torque motor Technical Field

[0001] This utility model relates to the field of machine tool spindle technology, and in particular to an auxiliary mounting structure for a permanent magnet synchronous torque motor. Background Technology

[0002] In current electric spindle applications, when using a permanent magnet synchronous torque motor as a power source, it is difficult to directly install the motor stator due to the magnetic field characteristics of its rotor. This can easily lead to scratches on the surface of the motor rotor, affecting the motor's performance and service life. To solve this problem, various jigs and fixtures are usually used for auxiliary installation. However, these jigs and fixtures are quite complex, making the installation process complicated and cumbersome. At the same time, the manufacturing cost of these jigs and fixtures is relatively high, which in turn increases the overall manufacturing cost of the electric spindle. Therefore, we propose an auxiliary installation structure for permanent magnet synchronous torque motors. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies and provide an auxiliary installation structure that simplifies the installation process, improves installation efficiency, and reduces costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An auxiliary mounting structure for a permanent magnet synchronous torque motor includes a permanent magnet synchronous torque motor spindle assembly and a guide shaft;

[0006] The spindle assembly includes a motor stator assembly, a motor rotor assembly, a rear bearing housing, and a shaft core assembly;

[0007] The motor stator assembly and the rear bearing housing are fitted with an H8 / f7 clearance, and the motor stator assembly and the rear bearing housing are fixed by threaded connection on the end face. The motor rotor assembly and the shaft core assembly form an H6 / p5 interference fit.

[0008] The guide shaft is a through-hole shaft structure, with its inner hole forming an H6 / h5 clearance fit with the outer circle of the shaft core assembly, and the outer circle of the guide shaft forming an H6 / h5 clearance fit with the inner hole of the rear bearing seat.

[0009] Furthermore, the end face of the guide shaft and the step of the end face of the shaft core assembly form a limiting fit.

[0010] Furthermore, the total length of the axial fit between the outer circle of the guide shaft and the inner hole of the rear bearing housing is greater than the total length of the motor stator assembly.

[0011] Furthermore, the clearance between the guide shaft and the rear bearing housing and the shaft core assembly is smaller than the air gap between the motor stator assembly and the motor rotor assembly, and the motor air gap is 0.5-1mm.

[0012] Furthermore, the inner hole mating surface of the guide shaft is the standard mating position of the bearing inner ring, and the outer circle mating surface is the standard mating position of the bearing outer ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Simple and quick assembly: Only one fixture is needed when installing the permanent magnet synchronous torque motor on the spindle, making assembly simple and quick;

[0015] 2. Low manufacturing cost and high versatility: The fixture has a simple structure and is easy to process. Moreover, the structural characteristics of the fixture are suitable for various permanent magnet synchronous torque motor spindles. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the state of an auxiliary installation structure for a permanent magnet synchronous torque motor provided by this utility model;

[0017] Figure 2 is a schematic diagram of the second state of the auxiliary installation structure of the permanent magnet synchronous torque motor provided by this utility model.

[0018] Legend: 1. Motor stator assembly; 2. Motor rotor assembly; 3. Rear bearing housing; 4. Guide shaft; 5. Shaft core assembly. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] Example

[0024] As shown in Figures 1-2, this utility model provides a technical solution: an auxiliary installation structure for a permanent magnet synchronous torque motor, including a permanent magnet synchronous torque motor main shaft assembly and a guide shaft 4;

[0025] The main spindle assembly includes a permanent magnet synchronous torque motor stator assembly 1, a permanent magnet synchronous torque motor rotor assembly 2, a rear bearing housing 3, and a shaft core assembly 5. The motor rotor assembly 2, as the torque motor rotor, has the characteristics of strong magnetism.

[0026] The motor stator assembly 1 and the rear bearing housing 3 are fitted with an H8 / f7 clearance, and the motor stator assembly 1 and the rear bearing housing 3 are fixed by threaded connection on their end faces. The motor rotor assembly 2 and the shaft core assembly 5 form an H6 / p5 interference fit.

[0027] The guide shaft 4 is a through-hole shaft structure. The outer circle and inner hole are machined to the required dimensions and are equipped with a matching guide. Its inner hole and the outer circle of the shaft core assembly 5 form an H6 / h5 clearance fit. The outer circle of the guide shaft 4 and the inner hole of the rear bearing seat 3 form an H6 / h5 clearance fit.

[0028] The step on the end face of the guide shaft 4 and the end face of the shaft core assembly 5 form a limiting fit.

[0029] The total length of the axial fit between the outer circle of the guide shaft 4 and the inner hole of the rear bearing housing 3 is greater than the total length of the motor stator assembly 1.

[0030] The clearance between the guide shaft 4, the rear bearing housing 3, and the shaft core assembly 5 is smaller than the air gap between the motor stator assembly 1 and the motor rotor assembly 2, and the air gap is 0.5-1mm.

[0031] Furthermore, since the inner hole mating surface of the guide shaft 4 is the standard mating position of the bearing inner ring, and the outer circle mating surface of the guide shaft 4 is the standard mating position of the bearing outer ring, the guide shaft 4 has high versatility. The same bearing is used at the rear end of the main shaft, and the total length of the motor stator assembly 1 is less than the total length of the outer circle mating position of the guide shaft 4. This fixture can be used for all such applications.

[0032] The working process of this utility model is as follows: A guide shaft 4 is used as a fixture. The inner hole of the guide shaft 4 is clearance-fitted with the mounting position of the rear bearing of the shaft core. The end face is fitted with the mounting end face of the rear bearing of the shaft core for limiting the position. The outer circle of the guide shaft 4 is clearance-fitted with the inner hole of the rear bearing seat 3. When using the guide shaft 4 to assist in the installation of the main spindle permanent magnet synchronous torque motor:

[0033] 1) Place the shaft core assembly 5 vertically, and install the motor rotor assembly 2 and the shaft core assembly 5 with an interference fit;

[0034] 2) The guide shaft 4 is installed into the rear end of the shaft core assembly 5. Due to gravity, the step on the end face of the shaft core assembly 5 cooperates with the end face of the guide shaft 4 to limit the movement.

[0035] 3) After the motor stator assembly 1 is screwed into the rear bearing housing 3, it is installed into the guide position on the outer circle of the guide shaft 4;

[0036] 4) At this time, as shown in Figure 1, the rear bearing housing 3 and the guide shaft 4 are installed vertically downward with an H6 / h5 clearance fit. At this time, when the motor stator assembly 1 has not entered the magnetic attraction area of ​​the motor rotor assembly 2, the clearance between the guide shaft 4 and the shaft core assembly 5, and between the guide shaft 4 and the rear bearing housing 3 is much smaller than the air gap between the motor stator assembly 1 and the motor rotor assembly 2 (the motor air gap is usually 0.5~1mm).

[0037] 5) In the state shown in Figure 1, the inner hole of the rear bearing housing 3 has entered the outer circle of the guide shaft 4 for fit. Continue to install the motor stator assembly 1 downwards to the required position, as shown in Figure 2. At this time, the permanent magnet synchronous motor is installed in place.

[0038] 6) After pulling out the guide shaft 4, the permanent magnet synchronous torque motor is fully assembled.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary mounting structure for a permanent magnet synchronous torque motor, characterized in that: The system includes a permanent magnet synchronous torque motor main shaft assembly and a guide shaft (4); the main shaft assembly includes a motor stator assembly (1), a motor rotor assembly (2), a rear bearing housing (3), and a shaft core assembly (5); the motor stator assembly (1) and the rear bearing housing (3) are fitted with an H8 / f7 clearance fit, and the motor stator assembly (1) and the rear bearing housing (3) are threadedly connected and fixed at their end faces; the motor rotor assembly (2) and the shaft core assembly (5) form an H6 / p5 interference fit; the guide shaft (4) is a through-hole shaft structure, and its inner hole forms an H6 / h5 clearance fit with the outer circle of the shaft core assembly (5); the outer circle of the guide shaft (4) forms an H6 / h5 clearance fit with the inner hole of the rear bearing housing (3).

2. The auxiliary mounting structure for a permanent magnet synchronous torque motor according to claim 1, characterized in that: The end face of the guide shaft (4) and the step of the end face of the shaft core assembly (5) form a limiting fit.

3. The auxiliary mounting structure for a permanent magnet synchronous torque motor according to claim 1, characterized in that: The total length of the axial fit between the outer circle of the guide shaft (4) and the inner hole of the rear bearing seat (3) is greater than the total length of the motor stator assembly (1).

4. The auxiliary mounting structure for a permanent magnet synchronous torque motor according to claim 1, characterized in that: The clearance between the guide shaft (4) and the rear bearing seat (3) and the shaft core assembly (5) is smaller than the air gap between the motor stator assembly (1) and the motor rotor assembly (2), and the air gap is 0.5-1mm.

5. The auxiliary mounting structure for a permanent magnet synchronous torque motor according to claim 1, characterized in that: The inner hole mating surface of the guide shaft (4) is the standard mating position of the inner ring of the bearing, and the outer circle mating surface is the standard mating position of the outer ring of the bearing.

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