CN2765373Y

CN2765373Y - Combined bearing magnetic suspension motor / electric main shaft

Info

Publication number: CN2765373Y
Application number: CN 200520068251
Authority: CN
Inventors: 栗合营; 俞梅; 徐文胜
Original assignee: Nanjing Normal University
Current assignee: Nanjing Normal University
Priority date: 2005-01-13
Filing date: 2005-01-13
Publication date: 2006-03-15
Anticipated expiration: 2015-01-13

Abstract

The utility model relates to a structural improvement of a magnetic levitation motor/electric main shaft, which belongs to the technical field of magnetic levitation power devices. The electric motor/electric main shaft includes a stator and a rotor, and the rotor is supported on an end cover by magnetic suspension bearings at both ends. The improvement is That is, the rotor is also equipped with a rolling bearing, and the fit gap between the outer ring of the rolling bearing and the end cover is smaller than the magnetic suspension gap. When working, under normal load conditions, the stator operates in a magnetic levitation state, which has the advantages of almost no friction, stable operation, and no noise. When the load is large or encounters a disturbance force, the load acts on the rolling bearing, thereby avoiding The magnetic suspension bearing is damaged by force. With a simple and reasonable structure, the utility model significantly improves the carrying capacity and adaptability of the magnetic suspension bearing under the condition of limited cost increase.

Description

Combination bearing magnetic levitaion motor/electric main shaft

Technical field

The utility model relates to a kind of motor/electric main shaft, and the architecture advances of especially a kind of magnetic levitaion motor/electric main shaft belongs to the magnetic suspension field of power equipment technology.

Background technology

Magnetic levitaion motor/electric main shaft has significant advantage than common main shaft aspect the high-speed, high precision machining, therefore has a extensive future.Retrieval is found, the Chinese patent application that the applying date is 02109707.0, name is called " mixed rotor type bearing-free motor " discloses a kind of mixed rotor type bearing-free motor of being made up of housing, stator, winding, rotor, load etc., this motor connects by mechanical axis, and torque and magnetic suspension force index simultaneously can get both.In addition, the patent application that application number is 03232489.8, name is called " magnetic suspension motor) " discloses a kind of magnetic suspension motor, comprise motor housing, central shaft, coil, permanent magnet, oscillator, also comprise a coasting body that passes central shaft, its beneficial effect is that the design of coasting body has then increased the high frequency state stability of motion down.

Yet the applicant finds, existing magnetic levitaion motor/electric main shaft bearing load limited in one's ability especially is difficult to bear perturbed force, and is therefore big or have the occasion of sudden change to use in load, is easy to damage.

Summary of the invention

The technical problems to be solved in the utility model is: the shortcoming at above prior art exists by architecture advances, proposes a kind of combination bearing magnetic levitaion motor/electric main shaft that can bear big load.

In order to solve above technical problem, combination bearing magnetic levitaion motor of the present utility model/electric main shaft comprises stator and rotor, described rotor is supported on the end cap by the magnetic suspension bearing at two ends, its improvements are, described rotor also is equipped with rolling bearing, and the fit clearance of described rolling bearing outer shroud and end cap is less than the magnetic suspension gap.

During work, under the normal load situation, stator is in the magnetic suspension state running, have magnetic suspension bearing almost zerofriction force, steady, the noiseless advantage of running, when loading big or running into perturbed force, load acts on the rolling bearing, thereby avoids the magnetic suspension shaft holding capacity to damage.

This shows that the utility model increases under the condition of limited at cost with the structure of advantages of simple, has significantly improved the bearing capacity and the adaptive capacity of magnetic suspension bearing.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the structural representation of an embodiment of the utility model.

Embodiment

Embodiment one

The combination bearing magnetic levitaion motor of present embodiment (or electric main shaft) as shown in Figure 1, the two ends of stator 8 fixedly mount front end housing 6 and rear end cap 11 respectively.It in the stator 8 iron core 9 that is wound with coil 10.Rotor 1 is supported on front end housing 6 and the rear end cap 11 by the magnetic suspension bearing at two ends.Outer shroud 5 and interior ring 4 that magnetic suspension bearing is made by ndfeb magnetic material are formed, two rings form the magnetic suspension gap with opposite polarity relative inner conical surface and male cone (strobilus masculinus) respectively, so both can bear certain radial load, also can bear axial force, form the action effect of radial thrust bearing, make compact conformation.Rolling bearing 2 also is equipped with in two outer ends that rotor 1 closes on magnetic suspension bearing.The outer shroud of this rolling bearing and the fit clearance of end cap are rotated for fear of outer shroud less than the magnetic suspension gap, have been embedded with the sealing ring 3 of damping action in the endoporus of two end cap installation rolling bearing outer shroud.

In normal operation, stator runs up under the magnetic suspension bearing with radial thrust bearing action effect supports.Big or when running into radially perturbed force when load, force transmission to rolling bearing, thereby avoid the mutual friction damage of NdFeB material.

Experiment shows that the combination bearing magnetic levitaion motor of present embodiment (electric main shaft) can significantly improve the bearing capacity and the adaptive capacity of magnetic suspension bearing, prolongs its useful life greatly.

In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.

Claims

1. A combined bearing magnetic levitation motor/electric spindle, including a stator and a rotor, the rotor is supported on the end cover by the magnetic levitation bearings at both ends, it is characterized in that: the rotor is also equipped with a rolling bearing, and the outer ring of the rolling bearing is connected to the end cover The fitting gap of the cover is smaller than the magnetic suspension gap.

2. The combined bearing magnetic levitation motor/electric spindle according to claim 1, characterized in that: the magnetic levitation bearing is composed of an outer ring and an inner ring made of a strong magnetic material, and the two rings have opposite inner cone surfaces with opposite polarities. A magnetic levitation gap is formed with the outer cone surface.

3. The combined bearing magnetic levitation motor/spindle according to claim 2, characterized in that: the two outer ends of the rotor adjacent to the magnetic levitation bearing are equipped with rolling bearings.

4. The combined bearing magnetic levitation motor/electric spindle according to claim 2 or 3, characterized in that a sealing ring for damping is embedded in the inner hole of the outer ring of the rolling bearing installed on the end cover.