A high-frequency response, low magnetic leakage, high-speed shaft assembly

Abstract

A high-frequency response, low magnetic leakage, high-speed shaft assembly includes a housing. Inside the housing, there are a motor assembly and a bearing assembly sleeved on a guide head. The bearing assembly is located on the right side of the motor assembly. A left end cover is installed at the left end of the housing, and a right end cover is installed at the right end of the housing. The motor assembly includes a motor stator fixedly connected to the housing. Inside the motor stator, there is a motor rotor. A transition plate is installed at the left end of the motor rotor, and the right end face of the transition plate is fixedly connected to the left end face of the guide head. The bearing assembly includes a bearing stator fixedly connected to the housing. Inside the bearing stator, there is a bearing rotor fixedly connected to the motor rotor. Bearing rolling elements are installed between the bearing rotor and the bearing stator. A reading head is installed on the right side of the bearing stator through a reading head support. A grating band is installed on the outer side wall of the bearing rotor. The present invention can increase the rotation speed of the bearing and also reduce the magnetic leakage of the hollow spindle, meeting the requirements of the test environment.

Description

Technical Field

[0001] The present invention relates to a rolling component, and particularly to a high-frequency response and low magnetic leakage high-speed shaft component. Background Art

[0002] As a key test equipment for high-precision and sophisticated tests, a three-axis (or five-axis) electric simulation turntable plays an extremely important role in the development process of missiles and aerospace vehicles. The missile guidance system is the core component of missiles and aircraft. There are mainly two test methods for evaluating the performance of the guidance system: one is to obtain data during actual target shooting or actual flight and continuously improve by discovering problems; the other method is to test and evaluate various performance indicators of the guidance system based on a semi-physical simulation test equipment on the ground. Since the dynamic characteristics of the missile (or aircraft) seeker are truly simulated under laboratory conditions, this equipment has been more and more widely used, and the requirements for high dynamics (or high-frequency response) and low magnetic leakage are becoming more and more stringent.

[0003] Generally, the hollow size of the inner ring shaft of the simulation turntable is larger than 400 mm in diameter. Most bearings use bearing steel as rolling elements (steel balls or cylindrical rollers), and the time for a single frequency response test does not exceed 10 seconds. The time interval between two tests is greater than 1 minute, so the bearing can be naturally cooled after heating; another reason for using bearing steel as rolling elements is that the process is mature and the manufacturing cost is low. The bearing can reach P4 or P2 level accuracy. The accuracy of the bearing itself is the basis for ensuring the rotation accuracy of the shafting, and thus also determines the control accuracy of the shafting.

[0004] In a certain specific test scenario, there are high requirements for the rotational speed of the shafting. In this working condition, the steel balls or cylindrical rollers made of bearing steel cannot meet the use requirements due to excessive heat generation. Therefore, ceramic balls are used to replace the steel balls, which can reduce the bearing heat generation and can meet the application scenarios with a rotational speed greater than 1000 r / min. However, due to manufacturing process reasons, the manufacturing cost of ceramic ball bearings is higher than that of bearings made of steel balls when producing bearings of the same accuracy. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-frequency response and low magnetic leakage high-speed shaft component to solve the problems in the above background art. It uses the connection of a bearing rotor and a motor rotor as the rolling main shaft, reduces the moment of inertia of the rolling main shaft, and improves the frequency response characteristics of the rolling shafting.

[0006] The technical solution adopted to achieve the above object is a high-frequency response, low magnetic leakage, high-speed shaft assembly, which includes a housing. An electric motor assembly and a bearing assembly sleeved on a guiding head are arranged inside the housing. The bearing assembly is located on the right side of the electric motor assembly. A left end cover is installed at the left end of the housing, and a right end cover is installed at the right end of the housing. The electric motor assembly includes an electric motor stator fixedly connected to the housing. An electric motor rotor is arranged inside the electric motor stator. A transition plate is installed at the left end of the electric motor rotor, and the right end face of the transition plate is fixedly connected to the left end face of the guiding head. The bearing assembly includes a bearing stator fixedly connected to the housing. A bearing rotor fixedly connected to the electric motor rotor is arranged inside the bearing stator. A bearing rolling element is installed between the bearing rotor and the bearing stator. A reading head is installed on the right side of the bearing stator through a reading head support. A grating band is installed on the outer side wall of the bearing rotor.

[0007] Further, the right end of the electric motor rotor is fixedly connected to the left end of the bearing rotor through a screw to form a rolling main shaft. The left end face of the electric motor rotor is the left end of the rolling main shaft, and the right end face of the bearing rotor is the right end of the rolling main shaft.

[0008] Further, both the bearing stator and the bearing rotor are made of stainless steel.

[0009] Further, the bearing rolling element is made of ceramic balls.

[0010] Beneficial effects

[0011] Compared with the prior art, the present invention has the following advantages.

[0012] 1. The present invention uses stainless steel to make the base body of the bearing assembly and ceramic balls as the bearing rolling elements, which improves the rotational speed and stiffness of the bearing and reduces the magnetic leakage of the bearing.

[0013] 2. The present invention uses the connection between the bearing rotor and the electric motor rotor to form a rolling main shaft. Therefore, the moment of inertia of the rolling shaft is reduced. Without increasing the power of the electric motor, the output efficiency of the electric motor can be improved, and the frequency response characteristics of the rolling shaft system can be improved. Description of the drawings

[0014] The present invention will be further described in detail below with reference to the drawings.

[0015] Figure 1 is a structural cross-sectional view of the present invention;

[0016] Figure 2 is a structural schematic Figure 1 ;

[0017] Figure 3 is a structural schematic Figure 2 ;

[0018] Figure 4It is a schematic structural diagram of the bearing assembly in the present invention. Detailed implementation manners

[0019] The present invention will be further described below in conjunction with embodiments and the accompanying drawings.

[0020] As Figures 1 - 4 shown, a high-frequency response and low magnetic leakage high-speed shaft assembly includes a housing 1. An electric motor assembly and a bearing assembly sleeved on a seeker 6 are arranged inside the housing 1. The bearing assembly is located on the right side of the electric motor assembly. A left end cover 13 is installed at the left end of the housing 1, and a right end cover 5 is installed at the right end of the housing 1. The electric motor assembly includes an electric motor stator 12 fixedly connected to the housing 1. An electric motor rotor 11 is arranged inside the electric motor stator 12. A transition plate 10 is installed at the left end of the electric motor rotor 11. The right end face of the transition plate 10 is fixedly connected to the left end face of the seeker 6. The bearing assembly includes a bearing stator 2 fixedly connected to the housing 1. A bearing rotor 4 fixedly connected to the electric motor rotor 11 is arranged inside the bearing stator 2. A bearing rolling element 3 is installed between the bearing rotor 4 and the bearing stator 2. A reading head 8 is installed on the right side of the bearing stator 2 through a reading head support 9. A grating tape 7 is installed on the outer side wall of the bearing rotor 4.

[0021] The right end of the electric motor rotor 11 is fixedly connected to the left end of the bearing rotor 4 by screws to form a rolling spindle. The left end face of the electric motor rotor 11 is the left end of the rolling spindle, and the right end face of the bearing rotor 4 is the right end of the rolling spindle.

[0022] Both the bearing stator 2 and the bearing rotor 4 are made of stainless steel.

[0023] The bearing rolling element 3 is made of ceramic balls.

[0024] The present invention uses the housing 1 as a support. The bearing stator 2 and the electric motor stator 12 are fixed on the housing 1. The left end of the bearing rotor 4 is fixedly connected to the right end flange of the electric motor rotor 11. The right end flange can be connected to a user's measured seeker. The left end flange of the electric motor rotor 11 is connected to the transition plate 10, and the seeker 6 is installed on the right side of the transition plate 10.

[0025] The electric motor rotor 11 and the bearing rotor 4 are assembled together with screws to form a rolling spindle. The left end flange surface of the electric motor rotor 11 and the right end flange surface of the bearing rotor 4 are the two end faces of the rolling spindle. The bearing stator 2 and the bearing rotor 4 are made of stainless steel, and the bearing rolling element 3 is made of ceramic balls. Using them in this way can reduce the heat generation of the rolling elements, increase the rotation speed of the bearing, and at the same time reduce the magnetic leakage of the hollow shaft system and ensure the shaft system stiffness.

[0026] In the present invention, the original steel ball rolling elements are replaced with bearing rolling elements 3 made of ceramic balls. The bearing stator 2 and the bearing rotor 4 in the bearing assembly are made of stainless steel. When the bearing rotates at high speed, the frictional torque of the bearing can be reduced, the heat generation of the rolling elements can be decreased, and moreover, the magnetic leakage caused by the bearing can also be reduced. In addition, the functions of the original rolling spindle are respectively replaced by the bearing rotor 4 and the motor rotor 11. The original bearing rotor is axially extended, the motor rotor is axially extended, and the motor rotor 11 and the bearing rotor 4 are fixedly connected. The right end face of the bearing rotor 4 and the left end face of the motor rotor 11 are used to connect the seeker 6.

[0027] The working principle of the present invention is that the high-speed shaft assembly is based on the housing 1, and the bearing assembly is integrally installed in the housing 1. Among them, both the bearing stator 2 and the bearing rotor 4 are made of stainless steel, which can greatly reduce magnetic leakage. The bearing rolling elements 3 are made of ceramic balls. The ceramic balls have a low density and a small centrifugal force, and the contact angle between them and the inner and outer rings changes little. In this way, the difference in the contact angle between the ceramic balls and the inner and outer rings is smaller than that of the steel ball bearing at high speed. Therefore, the bearing has less frictional heat generation and excellent high-speed performance. Since the elastic modulus of the ceramic balls is about 1.5 times that of the steel balls, for two elastic contact bodies, the higher the elastic modulus of the material, the smaller the contact deformation between the two objects under the same load. Therefore, the rolling shaft system has high stiffness. Connecting the bearing rotor 4 and the motor rotor 11 to form a rolling spindle can reduce the moment of inertia of the rolling shaft. Without increasing the weight of the motor, the output efficiency of the motor can be maximally improved, and the dynamic characteristics of the rolling shaft system can be enhanced.

[0028] In the specific implementation of the present invention, the bearing stator 2 and the motor stator 12 are fixed on the flange surface inside the housing 1 with screws; the left end of the bearing rotor 4 is fixedly connected to the right end flange of the motor rotor 11. A transition plate 10 is fixed at the left end of the motor rotor 11, and the seeker 6 is installed on the right flange surface of the transition plate 10; a thin-walled grating tape is installed on the outer wall of the bearing rotor 4, which can save installation space and reduce the moment of inertia of the rolling shaft; a reading head support 9 is installed on the right flange surface of the bearing stator 2, and a reading head 8 is installed on the end surface of the reading head support 9 for real-time measurement of the number of engraved lines of the grating tape 7; finally, a left end cover 13 is installed at the left end of the housing 1, and a right end cover 5 is installed at the right end of the housing 1. The total weight of the entire high-speed shaft assembly is less than 40 kg, and the size of the hollow shaft is generally less than 150 mm. It is packaged as a test unit and can be integrally inserted into the inner ring hollow shaft of the three-axis simulation turntable as the fourth axis; or integrally inserted into the hollow shaft of the five-axis simulation turntable as the sixth axis of the five-axis simulation turntable.

Claims

1. A high-frequency response, low magnetic leakage, high-speed shaft assembly, comprising a housing (1), characterized in that, a motor assembly and a bearing assembly sleeved on a seeker head (6) are arranged inside the housing (1), the bearing assembly is located on the right side of the motor assembly, a left end cover (13) is installed at the left end of the housing (1), and a right end cover (5) is installed at the right end of the housing (1). The motor assembly includes a motor stator (12) fixedly connected to the housing (1), a motor rotor (11) is arranged inside the motor stator (12), a transition plate (10) is installed at the left end of the motor rotor (11), and the right end face of the transition plate (10) is fixedly connected to the left end face of the seeker head (6). The bearing assembly includes a bearing stator (2) fixedly connected to the housing (1), a bearing rotor (4) fixedly connected to the motor rotor (11) is arranged inside the bearing stator (2), a bearing rolling element (3) is installed between the bearing rotor (4) and the bearing stator (2), a reading head (8) is installed on the right side of the bearing stator (2) through a reading head support (9), and a grating tape (7) is installed on the outer side wall of the bearing rotor (4); the right end of the motor rotor (11) is fixedly connected to the left end of the bearing rotor (4) by screws to form a rolling spindle, the left end face of the motor rotor (11) is the left end of the rolling spindle, and the right end face of the bearing rotor (4) is the right end of the rolling spindle; both the bearing stator (2) and the bearing rotor (4) are made of stainless steel; the bearing rolling element (3) is made of ceramic ball material.

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