CN2669457Y - Apparatus for preventing static discharge of motor stator and rotor - Google Patents
Apparatus for preventing static discharge of motor stator and rotor Download PDFInfo
- Publication number
- CN2669457Y CN2669457Y CNU2003201142384U CN200320114238U CN2669457Y CN 2669457 Y CN2669457 Y CN 2669457Y CN U2003201142384 U CNU2003201142384 U CN U2003201142384U CN 200320114238 U CN200320114238 U CN 200320114238U CN 2669457 Y CN2669457 Y CN 2669457Y
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- CN
- China
- Prior art keywords
- hole
- steel ball
- motor stator
- rotor
- static discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Motor Or Generator Frames (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The utility model discloses an apparatus for preventing electrostatic discharge of motor stator and rotor. Threaded through holes are provided along radial direction on the circumference of an excircle which is covered by the motor, the end part of the through hole is provided with a screw thread. A steel ball, a metal spring and a housing screw are installed in the through hole, and the steel ball is positioned on the inner end of the through hole and the steel ball is contacted with a spindle, the screw thread segments of the housing screw and the end part of the through hole are connected with each other, and the metal spring is located between the steel ball and the housing screw. The utility model is of simple and reliable structure and eay use, and the utility model can efficaciously avoid the accident happening of the electrostatic discharge damage of the motor stator and rotor.
Description
Technical field the utility model belongs to machine field, is specifically related to a kind of apparatus capable of preventing motor stator from static discharge.
The background technology motor is a kind of equipment that is widely used in industrial and agricultural production at present; Motor in the course of the work, the electric charge accumulation phenomena can take place in motor stator and rotor surface, when electric charge accumulates to a certain extent, the static discharge phenomenon will take place between electric machine rotor.The position that static discharge takes place usually is motor bearings and motor encoder etc.
Motor bearings adopts at present extensively the steel bearing, and the lubricating oil film of bearing surface has insulating effect, but under the high-pressure electrostatic discharging condition, oil film is easy to breakdown, and causes bearing surface galvanic corrosion to occur and damage.When conducts such as motor bearings employing ceramic bearing are supported, because the insulating effect of Ceramic Balls, static discharge is not easy to take place at bearing portion, carries out between encoder gear that is fixed on the rotor and the encoder seat that is fixed in electric machine stand and can transfer to, thereby causes encoder to damage.In recent years, ac variable speed technology is used very general at machine field.The high order electromagnetism harmonic wave that is caused by converter technique makes electric machine rotor produce the probability of induction static than increasing greatly in the past.According to statistics, at present bearing has been because the fault that static discharge causes has accounted for more than 10% of all bearing faults, and in continuous growth; And since static discharge to cause encoder fault to account for all probability that break down of encoder higher.
For fear of electric machine rotor static discharge takes place at positions such as bearing and encoders, solution commonly used is rotor ground connection, and bearing adopts the lubricant with conductivity.But owing to contain metallic particles, usually can run out bearing in the lubricant of conductivity, cause bearing life to shorten.The another kind of conventional approach of avoiding static discharge is that carbon brush ground connection is passed through in rotating shaft, but because carbon brush is easy to generate pollution, and need clean surrounding environment when changing, and it is very inconvenient to cause changing carbon brush.Thereby proposed a kind of method now again, but, be difficult on the engineering realize because this method cost is very high by shield electric machine stator winding elimination induced voltage minimizing static discharge.
Utility model content technical problem to be solved in the utility model provides a kind of apparatus capable of preventing motor stator from static discharge simple in structure, simple for use.
The technical scheme in the invention for solving the above technical problem is: it is radially to offer threaded through hole on the cylindrical circumference of electric motor end cap, the through hole end is provided with screw thread, and steel ball, metal spring and housing screw be set in this through hole, described steel ball is positioned at through hole the inner and contacts with main shaft, the set thread segment in housing screw and through hole end is connected, and metal spring is between steel ball and housing screw.
As further improvement of the utility model, a metallic gasket is set between described steel ball and the metal spring.
Described threaded through hole can be one or more.
Described threaded through hole is positioned at the below of electric motor end cap installation site.
The beneficial effects of the utility model are: in the tapped through hole that the utility model is radially offered on the cylindrical circumference of electric motor end cap steel ball, metal spring and housing screw are set, steel ball remains under the effect of spring force with main shaft and is in the conductor contact condition; Because rotor is that conductor contacts with main shaft, motor stator is that conductor contacts with electric machine stand, and in fact main shaft has constituted electric machine rotor a loop by contacting with electric machine stand with steel ball, spring, electric motor end cap.Simultaneously because the common ground connection of electric machine stand, so the static on rotor and the motor stator can directly discharge by earthing conductor, thereby avoided the high-pressure electrostatic electric discharge phenomena between the electric machine rotor.The utility model is simple and reliable for structure, and is simple for use, can avoid electric machine rotor electrostatic discharge damage fault to take place effectively.
The utility model both can also can be finished by transforming processing original motor end cap by directly substituting the function that the original motor end cap realizes avoiding the electric machine rotor static discharge, implemented very convenient.
Description of drawings
Fig. 1 is the structural representation front view of the utility model embodiment;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is installed on structural representation on the motor for the utility model.
Each label is represented among the figure:
1, electric motor end cap 11, through hole 2, steel ball 3, metal spring
4, housing screw 5, metallic gasket 6, main shaft 7, electric machine stand
8, motor stator 9, rotor
Embodiment as shown in Figure 1, 2, 3, apparatus capable of preventing motor stator from static discharge of the present utility model, it is radially to offer threaded through hole 11 on the cylindrical circumference of electric motor end cap 1, this hole can be provided with one or more along circumference, for the reliability that guarantees that rotor 9 contacts with steel ball 2 conductors, can be provided with a plurality ofly, present embodiment is two.Through hole 11 ends are provided with screw thread, and steel ball 2, metal spring 3 and housing screw 4 be set in this through hole 11, steel ball 2 is positioned at through hole 11 the inners and contacts with main shaft 6, the set thread segment in housing screw 4 and through hole 11 ends is connected, metal spring 3 is between steel ball 2 and housing screw 4, and steel ball 2 remains under the effect of spring force with metal main shaft 6 and is in the conductor contact condition; Spring force is by regulating the degree of depth of housing screw 4 screw-in electric motor end caps 1 set through hole 11, and the decrement that changes metal spring 3 realizes.One metallic gasket 5 also can be set between steel ball 2 and the metal spring 3, be beneficial to the rolling of steel ball 2.
The orientation of this device machining screw through hole 11 on electric motor end cap 1 cylindrical circumference can be any, and stagger with the trip bolt hole site of electric motor end cap 1.As shown in Figure 3, preferably be arranged at the below of electric motor end cap 1 installation site, like this, do not need to take off electric motor end cap 1 complete operation easily when changing steel ball 2 and metal spring 3.
Operation principle of the present utility model is: steel ball 2 remains under the effect of spring force with metal main shaft 6 and is in the conductor contact condition, rotor 9 contacts for conductor with main shaft 6, motor stator 8 and electric machine stand 7 are for conductor contacts, and in fact main shaft 6 has constituted electric machine rotor a loop (see figure 3) by contacting with electric machine stand 7 with steel ball 2, metal spring 3, electric motor end cap 1.Simultaneously because electric machine stand 7 common ground connection, so the static on rotor 9 and the motor stator 8 can directly discharge by earthing conductor, thereby avoided the high-pressure electrostatic electric discharge phenomena between the electric machine rotor.
The utility model can directly substitute the original motor end cap when using, and also can realize by transforming processing original motor end cap.
Claims (4)
1, a kind of apparatus capable of preventing motor stator from static discharge, it is characterized in that it is radially to offer threaded through hole (11) on the cylindrical circumference of electric motor end cap (1), through hole (11) end is provided with screw thread, steel ball (2), metal spring (3) and housing screw (4) are set in this through hole (11), described steel ball (2) is positioned at through hole (11) the inner and contacts with main shaft (6), the set thread segment in housing screw (4) and through hole (11) end is connected, and metal spring (3) is positioned between steel ball (2) and the housing screw (4).
2, apparatus capable of preventing motor stator from static discharge according to claim 1 is characterized in that between described steel ball (2) and the metal spring (3) metallic gasket (5) being set.
3, apparatus capable of preventing motor stator from static discharge according to claim 1 and 2 is characterized in that described threaded through hole (11) is one or more.
4, apparatus capable of preventing motor stator from static discharge according to claim 1 and 2 is characterized in that described threaded through hole (11) is positioned at the below of electric motor end cap (1) installation site.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201142384U CN2669457Y (en) | 2003-11-28 | 2003-11-28 | Apparatus for preventing static discharge of motor stator and rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201142384U CN2669457Y (en) | 2003-11-28 | 2003-11-28 | Apparatus for preventing static discharge of motor stator and rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2669457Y true CN2669457Y (en) | 2005-01-05 |
Family
ID=34438897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2003201142384U Expired - Lifetime CN2669457Y (en) | 2003-11-28 | 2003-11-28 | Apparatus for preventing static discharge of motor stator and rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2669457Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107534254A (en) * | 2015-04-13 | 2018-01-02 | 申克铁路和医疗系统有限责任公司 | Electric discharge device |
-
2003
- 2003-11-28 CN CNU2003201142384U patent/CN2669457Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107534254A (en) * | 2015-04-13 | 2018-01-02 | 申克铁路和医疗系统有限责任公司 | Electric discharge device |
| US10819195B2 (en) | 2015-04-13 | 2020-10-27 | Schunk Transit Systems Gmbh | Discharge device |
| CN107534254B (en) * | 2015-04-13 | 2020-11-27 | 申克运输系统有限责任公司 | Discharge device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20060614 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |