CN1547309A - A device that can prevent electrostatic discharge of motor stator and rotor - Google Patents
A device that can prevent electrostatic discharge of motor stator and rotor Download PDFInfo
- Publication number
- CN1547309A CN1547309A CNA2003101105801A CN200310110580A CN1547309A CN 1547309 A CN1547309 A CN 1547309A CN A2003101105801 A CNA2003101105801 A CN A2003101105801A CN 200310110580 A CN200310110580 A CN 200310110580A CN 1547309 A CN1547309 A CN 1547309A
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- Prior art keywords
- hole
- steel ball
- static discharge
- motor stator
- rotor
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- Granted
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 230000003068 static effect Effects 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 18
- 238000009434 installation Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 239000004020 conductor Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Motor Or Generator Frames (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The invention discloses a device which can prevent the engine fixed rotor from static discharge, it sets a ventilated hole with screw along the axial direction on the outer peripheral of the engine end cover, there has screw on end of the ventilated hole, there set steel balls, metal spring and pressing screw in the hole, the steel bass is in the hole and connected with the main shaft, the pressing screw is connected with the screw set at the ventilated end, the metal spring is between the steel ball and the pressing screw. The structure in the invention is simple and reliable, the utilization is convenient, it can prevent the static discharge failure of engine fixed rotor.
Description
Technical field the invention 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.
Summary of the invention technical problem to be solved by this invention provides a kind of apparatus capable of preventing motor stator from static discharge simple in structure, simple for use.
The technical scheme that the present invention solves the problems of the technologies described above employing 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 a further improvement on the present invention, 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.
Beneficial effect of the present invention is: in the tapped through hole that the present invention radially offers 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 present invention 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 present invention both can also can finish 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 embodiment of the invention;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is installed on structural representation on the motor for the present invention.
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 invention, 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 invention 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.
Can directly substitute the original motor end cap when the present invention uses, 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 |
|---|---|---|---|
| CN 200310110580 CN1259765C (en) | 2003-11-28 | 2003-11-28 | A device that can prevent electrostatic discharge of motor stator and rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310110580 CN1259765C (en) | 2003-11-28 | 2003-11-28 | A device that can prevent electrostatic discharge of motor stator and rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1547309A true CN1547309A (en) | 2004-11-17 |
| CN1259765C CN1259765C (en) | 2006-06-14 |
Family
ID=34335673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310110580 Expired - Fee Related CN1259765C (en) | 2003-11-28 | 2003-11-28 | A device that can prevent electrostatic discharge of motor stator and rotor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1259765C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101689785B (en) * | 2007-06-25 | 2012-05-09 | 松下电器产业株式会社 | Electric motor, and electric device having the motor |
| CN103650300A (en) * | 2011-07-13 | 2014-03-19 | 株式会社Ihi | Electric motor |
| CN104037985A (en) * | 2014-06-04 | 2014-09-10 | 湖南海捷主轴科技有限公司 | Motor rotor anti-static discharging device and assembly method |
| CN105990933A (en) * | 2015-01-28 | 2016-10-05 | 德昌电机(深圳)有限公司 | motor |
| CN108322979A (en) * | 2018-03-16 | 2018-07-24 | 镇江市阳光西尔新材料科技有限公司 | A kind of static electricity earthing device of agitating device |
| CN109167480A (en) * | 2018-11-02 | 2019-01-08 | 浙江斯耐特动力股份有限公司 | The electric corrosion prevention earthing or grounding means of variable frequency motor bearing |
| CN113664765A (en) * | 2021-08-31 | 2021-11-19 | 苏州通格电子设备有限公司 | Electric screwdriver anti-static grounding device |
-
2003
- 2003-11-28 CN CN 200310110580 patent/CN1259765C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101689785B (en) * | 2007-06-25 | 2012-05-09 | 松下电器产业株式会社 | Electric motor, and electric device having the motor |
| CN103650300A (en) * | 2011-07-13 | 2014-03-19 | 株式会社Ihi | Electric motor |
| CN103650300B (en) * | 2011-07-13 | 2016-01-06 | 大金工业株式会社 | electric motor |
| US9276451B2 (en) | 2011-07-13 | 2016-03-01 | Daikin Industries, Ltd. | Electrical motor |
| CN104037985A (en) * | 2014-06-04 | 2014-09-10 | 湖南海捷主轴科技有限公司 | Motor rotor anti-static discharging device and assembly method |
| CN104037985B (en) * | 2014-06-04 | 2017-01-25 | 湖南海捷主轴科技有限公司 | Motor rotor anti-static discharging device and assembly method |
| CN105990933A (en) * | 2015-01-28 | 2016-10-05 | 德昌电机(深圳)有限公司 | motor |
| CN113258705A (en) * | 2015-01-28 | 2021-08-13 | 德昌电机(深圳)有限公司 | Motor capable of resisting high-voltage static electricity |
| CN108322979A (en) * | 2018-03-16 | 2018-07-24 | 镇江市阳光西尔新材料科技有限公司 | A kind of static electricity earthing device of agitating device |
| CN109167480A (en) * | 2018-11-02 | 2019-01-08 | 浙江斯耐特动力股份有限公司 | The electric corrosion prevention earthing or grounding means of variable frequency motor bearing |
| CN109167480B (en) * | 2018-11-02 | 2024-08-06 | 浙江斯耐特动力股份有限公司 | Anti-electric erosion grounding device of variable frequency motor bearing |
| CN113664765A (en) * | 2021-08-31 | 2021-11-19 | 苏州通格电子设备有限公司 | Electric screwdriver anti-static grounding device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1259765C (en) | 2006-06-14 |
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