CN201478216U - Quick control mechanism of permanent-magnetic circuit breaker - Google Patents
Quick control mechanism of permanent-magnetic circuit breaker Download PDFInfo
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- CN201478216U CN201478216U CN2009201732590U CN200920173259U CN201478216U CN 201478216 U CN201478216 U CN 201478216U CN 2009201732590 U CN2009201732590 U CN 2009201732590U CN 200920173259 U CN200920173259 U CN 200920173259U CN 201478216 U CN201478216 U CN 201478216U
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- moving iron
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Abstract
The utility model relates to a quick control mechanism of a permanent-magnetic circuit breaker, which comprises an electromagnetic repulsion mechanism for driving the tripping and a permanent-magnetic mechanism which is used for driving the closing and for maintaining the tripping and the closing, wherein the permanent-magnetic mechanism comprises a movable iron core and an output shaft which is used for driving an arc extinguishing device to act, the movable iron core is fixedly connected with the output shaft, the electromagnetic repulsion mechanism comprises a fixed repulsion coil and a repulsion metal disc under the effect of a magnetic field of the repulsion coil, and the repulsion metal disc is fixedly connected with the output shaft. The permanent-magnetic mechanism also comprises a fixed hollow cylindrical magnetic yoke, the movable iron core is arranged inside a cylindrical space of the magnetic yoke, and the lower part of an annular space between the movable iron core and the magnetic yoke is provided with a closing coil for producing a closing driving force and a permanent-magnetic guide mechanism for maintaining the state. The quick control mechanism satisfies the requirement of the quick disconnection, can maximally protect the devices on the circuit against the damage, and can improve the power supply reliability of the distribution network.
Description
Technical field
The utility model relates to a kind of digital intelligent power supply unit, particularly is used for excising fast the quick operating mechanism of the permanent-magnet breaker of fault.
Background technology
Circuit breaker is requisite key industry product of electric power system and key element, and its task is to close, close load current and cut-off short-circuit current, and electric equipment is avoided damaging on protection electrical network and the loop, so the reliability of circuit breaker and rapidity are most important.For the circuit breaker product, The faster the better to require the circuit breaker action theoretically, can excise fault rapidly like this, and the accident that prevents spreads at electrical network.In addition,, not only require the fastest responsiveness after fault takes place, also require minimum excision fault coverage in order to improve the power distribution network power supply reliability.
At power distribution network, vacuum circuit-breaker has occupied absolute leading position at present.Its operating mechanism of existing vacuum circuit-breaker is divided into spring operating mechanism and permanent-magnet operating mechanism; owing to be subjected to technology, design, structural restriction; the intrinsic opening time of these two kinds of operating mechanisms is generally all about 20ms; the protection action outlet time is generally all greater than 30ms; therefore cause the quick-break fault (comprise circuit breaker operate time) to take place the whole group of back protection operate time, i.e. 3-4 cycle generally at 50～80ms.And because present circuit breaker fast tripping protection does not have corresponding differential cooperation operate time, the scope that causes power failure is big.
Along with the development of digital transformer substation, the responsiveness of existing circuit breaker and the big defective of power failure scope highlight, and become important limiting factor.
The utility model content
In order to overcome above-mentioned defective, the utility model provides a kind of quick operating mechanism of permanent-magnet breaker.This circuit breaker had both satisfied the requirement of quick disjunction, can disconnect in a cycle, and higher intelligent level is arranged again, applicable to differential cooperation so that the failure removal scope is contracted to littler.
The technical scheme that the utility model adopted is:
A kind of quick operating mechanism of permanent-magnet breaker comprises being used to drive the electromagnetic repulsion force mechanism of separating brake and being used to drive the permanent magnet mechanism that closes a floodgate and divide, close a floodgate and keep.
Described permanent magnet mechanism comprises moving iron core and is used to drive the output shaft of arc-control device action, described moving iron core is fixedlyed connected with described output shaft, described electromagnetic repulsion force mechanism comprises fixing repulsion coil and is subjected to the repulsion metal dish of described repulsion coil magnetic field effect that described repulsion metal dish is fixedlyed connected with described output shaft.
Described permanent magnet mechanism can also comprise the yoke of fixing hollow columnar, described moving iron core is positioned at the cylindrical space of described yoke, the bottom of the annular space between described moving iron core and the described yoke is provided with the closing coil that is used to produce the combined floodgate actuating force, described electromagnetic repulsion force mechanism be positioned at described permanent magnet mechanism above or below.
Annular space between described moving iron core and the described yoke can also be provided with permanent magnetism magnetic conduction mechanism, described permanent magnetism magnetic conduction mechanism ringwise, and be looped around the outside of described moving iron core, described permanent magnetism magnetic conduction mechanism comprises permanent magnet and magnetic conductor, described permanent magnetism magnetic conduction mechanism directly connects the inwall of described yoke, and its internal diameter is greater than the external diameter of described moving iron core, and described permanent magnet can be positioned at the inboard or the outside of described magnetic conductor, or embeds the middle part of described magnetic conductor.
Described yoke can be the split structure, comprises the yoke body of hollow columnar of both ends open and separating brake baffle plate that is provided with central through hole and the combined floodgate baffle plate that is fixedly connected on described yoke body upper/lower terminal.
Described repulsion metal dish can be repulsion copper dish, can mechanical structured member indirect securement directly fixedly connected or that form by other single or multiple parts be connected between described output shaft and the described repulsion copper dish.
Described mechanical structured member can be connecting rod and the described moving iron core that is fixed together.
One end of described moving iron core can be provided with screwed hole of centre, and be threaded with described output shaft by this screwed hole, the other end of described moving iron core can be provided with screwed hole of centre, and be threaded with described connecting rod by this screwed hole, the other end of described connecting rod is fixedlyed connected with described repulsion copper dish by thread connector.
The described screwed hole of centre at the two ends of described moving iron core can communicate.
The straight Jing of central through hole on the described yoke can be less than the diameter of described moving iron core.
The beneficial effects of the utility model are:
The utility model mainly utilizes the rapid action feature of electromagnetic repulsion force mechanism to realize the quick-break of circuit breaker, make to put in order and organize operate time less than a cycle (20ms), and in conjunction with adopting permanent magnet mechanism to improve reliability, and reduced cost, be suitable for especially using under the occasion of quick disjunction requirement.
Description of drawings
Fig. 1 is the schematic diagram of electromagnetic repulsion force mechanism;
Fig. 2 is the structural representation (separating brake position) of an embodiment of the operating mechanism of the utility model circuit breaker;
Fig. 3 is the structural representation (separating brake position) of another embodiment of the operating mechanism of the utility model circuit breaker;
Fig. 4 is the structure chart (separating brake position) of an embodiment of the operating mechanism of circuit breaker of the present utility model.
Embodiment
At present the operating mechanism that is used to drive combined floodgate, separating brake of power distribution network circuit breaker is generally pull operation mechanism or permanent magnet mechanism, because structural reason generally divides the time admittedly more than 20ms, can not satisfy the needs of quick acting switching-off.In order to realize the QA purpose of mechanism, the quick operating mechanism of permanent-magnet breaker of the present utility model adopts electromagnetic repulsion force mechanism to realize quick acting switching-off.As shown in Figure 1, described electromagnetic repulsion force mechanism comprises fixing repulsion coil 1 and is subjected to the repulsion metal dish of described repulsion coil magnetic field effect, as repulsion copper dish 2 (this metal dish can be the copper dish), described repulsion copper dish is fixedlyed connected with the output shaft that is used to drive the arc-control device action.Be in series with on the current supply circuit of described repulsion coil to the precharge capacitor C 4 of described repulsion coil discharge and the on-off controller K3 that controls this loop current switching.When on-off controller 3 makes this loop closed, precharge electric capacity 4 is to 1 discharge of repulsion coil, and produce bigger pulse current, and this moment, repulsion copper dish 2 moved upward because of the effect that inductive loop is subjected to electromagnetic push F, thus the output shaft that drives described operating mechanism moves upward.This electromagnetic repulsion force mechanism is the switch operating mechanism that utilizes eddy current repulsion principle to make, and promptly can drive the load quick acting at short notice, has therefore realized quick acting switching-off.The applicant has carried out the experiment comparative analysis through prototype test with the permanent-magnet manipulating mechanism of similar function, and this electromagnetic repulsion force mechanism action is quick, and the reaction time is about 3ms, far below the permanent-magnet manipulating mechanism of similar function.
Precharge electric capacity 4 is connected in the output of a charging circuit simultaneously, in order to the forward direction precharge electric capacity charging of discharging next time.
In order to adapt with electromagnetic repulsion force mechanism desired big pulse Control current etc., the on-off controller that is used for repulsion coil switching control of the present utility model adopts the high-power thyristor switch.
Reliable for guaranteeing breaker closing, take into account aspects such as cost and reliability simultaneously, the technical scheme that operating mechanism of the present utility model adopts electromagnetic repulsion force mechanism and permanent magnet mechanism to combine, specifically be to utilize electromagnetic repulsion force mechanism to drive separating brake, permanent magnet mechanism realizes that separating brake keeps, and reduces overshoot and bounce-back when guaranteeing quick acting switching-off; Utilize the permanent magnet mechanism driving to close a floodgate and realize closing a floodgate and keep, both guaranteed the reliable of combined floodgate, reduced requirement again, reduced the volume and the cost of circuit breaker control.
Described permanent magnet mechanism comprises each other fixedly connected moving iron core and described output shaft, because repulsion copper dish fixedlys connected with output shaft, so repulsion copper dish has also driven moving iron core and moves to the separating brake position under the effect of electromagnetic push F.
By the closing coil of arbitrary form is set, it can be acted on mutually with moving iron core, when switching on, closing coil attract moving iron core to carry out feed motion, and drive repulsion copper dish and output shaft and carry out feed motion, make output shaft reach closing position, realize the purpose of closing a floodgate.The structure of described closing coil and installation site can be according to prior art and other any possible technology.
Shown in Fig. 2,3, described permanent magnet mechanism can also comprise the yoke 17 of fixing hollow columnar, described moving iron core 8 is positioned at the cylindrical space of described yoke, and the bottom of the annular space between described moving iron core and the described yoke is provided with the closing coil 9 that is used to produce the combined floodgate actuating force.
Described electromagnetic repulsion force mechanism be positioned at described permanent magnet mechanism above or below, by the suitable relative position that is provided with between described closing coil, moving iron core, repulsion copper dish and the repulsion coil, the traffic direction (separating brake direction) that drives repulsion copper dish when making the direction of motion (combined floodgate direction) that closing coil when energising drive moving iron core with the repulsion coil electricity is opposite, just can realize driving the output shaft separating brake and by the purpose of permanent magnet mechanism drive output shaft combined floodgate by repulsive force mechanism.
Annular space between described moving iron core and the described yoke can also be provided with the permanent magnetism magnetic conduction mechanism that is used for branch, close a floodgate keeps, and (annular that described annular had both comprised integrative-structure and has been also comprises the annular that the branch body structure along the circumferential direction is uniformly at intervals ringwise in described permanent magnetism magnetic conduction mechanism; Both comprised that annular also comprised non-just round annular), and be looped around the outside of described moving iron core, described permanent magnetism magnetic conduction mechanism comprises permanent magnet and magnetic conductor, described permanent magnetism magnetic conduction mechanism directly connects the inwall of described yoke, and its internal diameter is greater than the external diameter of described moving iron core, and not influence pumping of moving iron core, described permanent magnet is positioned at the inboard or the outside of described magnetic conductor, or embedding the middle part of described magnetic conductor, permanent magnetism magnetic conduction mechanism and yoke, moving iron core constitute magnetic loop jointly.
(1) as shown in Figure 2, described electromagnetic repulsion force mechanism is positioned at the outer upper of described yoke, the upper/lower terminal of described yoke is provided with central through hole separately, described repulsion copper dish 2 is fixedlyed connected with described moving iron core by connecting rod 13, described connecting rod passes the central through hole of the upper end of described yoke, described moving iron core is fixedlyed connected with described output shaft 15, and the central through hole that described output shaft passes the lower end of described yoke stretches out downwards.In the practice, described connecting rod and described output shaft can be same axles, pass the center through hole of described moving iron core and be fixed together in described moving iron core, and also can be two separate concentric shafts, the two ends up and down of fixedly connected respectively and described moving iron core.
(2) as shown in Figure 3, described electromagnetic repulsion force mechanism is positioned at the outer lower portion of described yoke, and the lower end of described yoke is provided with central through hole, and the central through hole that described output shaft 15 passes the lower end of described yoke is directly fixedlyed connected with described repulsion copper dish 2.
In addition, described yoke also can be the branch body structure, as in the relative installation example of permanent magnet mechanism shown in Figure 2 and electromagnetic repulsion force mechanism, adopting the yoke of split, as shown in Figure 4, comprise the yoke body 5 of hollow columnar of both ends open and separating brake baffle plate 6 that is provided with central through hole and the combined floodgate baffle plate 7 that is fixedly connected on described yoke body upper/lower terminal, and having formed the cylindrical space of a relative closure, moving iron core 8 is in this cylindrical space and can reciprocating motion between separating brake baffle plate 6 and combined floodgate baffle plate 7.The bottom of the annular space of closing coil 9 between moving iron core 8 and yoke body 5 promptly near combined floodgate baffle plate one side, is used to produce the combined floodgate actuating force.Magnetic conductor 10 and permanent magnet 11 are successively set on the top of closing coil 9 from the inside to the outside, are used for realizing dividing, closing a floodgate maintenance.There is slight void between magnetic conductor 10 and closing coil 9 and the moving iron core 8, pumps not influence moving iron core.
Can directly be connected between described output shaft and the described copper dish (as Fig. 3), also can be connected indirectly (as Fig. 2,4) by the mechanical structured member that other single or multiple parts are formed, the mode that is connected can be an integral type, the split welded type also can be various connected modes under the prior aries such as thread connection.
When being thread connection, an end of described moving iron core can be provided with screwed hole of centre, and an end of described output shaft 15 is provided with external screw thread, and fixedlys connected with described moving iron core by screwing in above-mentioned screwed hole of centre.
In structure example shown in Figure 4, electromagnetic repulsion force mechanism is positioned at the top in the yoke outside, and output shaft stretches out from the yoke bottom, and repulsion copper dish 2 can be fixedlyed connected with output shaft with moving iron core 8 by connecting rod 13 successively.When adopting thread connection, the other end of described moving iron core also can be provided with screwed hole of centre, one end of connecting rod is provided with external screw thread, realize fixedlying connected of connecting rod and moving iron core by the mode that connecting rod is screwed in this screwed hole of centre, the other end of described connecting rod then can by thread connector as screw 14 with as described in repulsion copper dish fixedly connected.In addition, moving iron core also can adopt the center tapped through hole structure shown in the figure, and output shaft is fixedlyed connected with moving iron core by this center tapped through hole, and an end that stretches out is directly fixedlyed connected with repulsion copper dish again.
Repulsion coil and yoke are relatively-stationary, and the coil 1 of repulsion described in Fig. 4 is fixedly connected on the separating brake baffle plate 6 by standing screw 12, mounting panel 16.
The straight Jing of central through hole on the described yoke two ends can play certain position-limiting action less than the diameter of described moving iron core.
The overhanging end of described output shaft drives arc-control device by mechanical transmission mechanism, and this end can be provided with external screw thread.
The course of action of quick operating mechanism of the present utility model is:
1. close a floodgate:
After receiving the order of closing a floodgate, closing coil place electricity circuit closed, the closing coil energising also produces magnetic field, and the magnetic line of force is got back to moving iron core again through moving iron core, combined floodgate baffle plate, yoke body, permanent magnet and magnetic conductor, transmits the loop thereby constituted the complete magnetic line of force.Moving iron core overcomes the confining force that permanent magnet field makes progress to its top and moves downward under magneticaction, drives output shaft simultaneously and moves downward closing position, and the contact of breaker closure has been finished the connection of circuit.Simultaneously, under the drive of output shaft, repulsion copper dish also synchronously moves downward, and corresponding sports is to the ready position of separating brake.After this, the order of closing a floodgate is cancelled, and moving iron core relies on the attraction of permanent magnet to remain on this closing position.
2. separating brake:
After receiving the separating brake order, on-off controller is connected, repulsion coil power supply circuit closed, precharge electric capacity is to the repulsion coil discharge, and the bigger pulse current of generation, repulsion copper dish is subjected to electromagnetic push effect upwards because of inductive loop, move upward having overcome under the situation of permanent magnet field to the downward confining force of moving mandrel lower, drive output shaft by connecting rod and moving iron core simultaneously and promptly move upward to the separating brake position, the driving of circuit breaker by other mechanical transmission mechanisms makes in the arc-control device two contacts separate and produces electric arc betwixt, arc extinction when the electric current natural zero-crossing has been finished cut-offfing of circuit.After this, the separating brake order is cancelled, and moving iron core relies on the attraction of permanent magnet to remain on this separating brake position.
The quick operating mechanism of permanent-magnet breaker of the present utility model possesses automatically defencive function fast; its quick-break is compared traditional permanent-magnet manipulating mechanism and shorten greatly operate time; can taper to the power failure scope littler at faster speed; therefore improved the power supply reliability of power distribution network; protect the electric equipment on the loop to avoid damaging to a greater extent, adapted to reliability, the rapidity demand for development of electric power system.
For the ease of explaining, this specification alleged " on ", illustrated orientation in all relative Figure of description of D score notion, do not constitute the restriction in upper and lower orientation when the utility model is in actual user mode.
Claims (10)
1. the quick operating mechanism of a permanent-magnet breaker is characterized in that comprising being used to drive the electromagnetic repulsion force mechanism of separating brake and being used to drive the permanent magnet mechanism that closes a floodgate and divide, close a floodgate and keep.
2. the quick operating mechanism of permanent-magnet breaker according to claim 1, it is characterized in that described permanent magnet mechanism comprises moving iron core and is used to drive the output shaft that arc-control device moves, described moving iron core is fixedlyed connected with described output shaft, described electromagnetic repulsion force mechanism comprises fixing repulsion coil and is subjected to the repulsion metal dish of described repulsion coil magnetic field effect that described repulsion metal dish is fixedlyed connected with described output shaft.
3. the quick operating mechanism of permanent-magnet breaker according to claim 2, it is characterized in that described permanent magnet mechanism also comprises the yoke of fixing hollow columnar, described moving iron core is positioned at the cylindrical space of described yoke, the bottom of the annular space between described moving iron core and the described yoke is provided with the closing coil that is used to produce the combined floodgate actuating force, described electromagnetic repulsion force mechanism be positioned at described permanent magnet mechanism above or below.
4. the quick operating mechanism of permanent-magnet breaker according to claim 3, it is characterized in that the annular space between described moving iron core and the described yoke also is provided with permanent magnetism magnetic conduction mechanism, described permanent magnetism magnetic conduction mechanism ringwise, and be looped around the outside of described moving iron core, described permanent magnetism magnetic conduction mechanism comprises permanent magnet and magnetic conductor, described permanent magnetism magnetic conduction mechanism directly connects the inwall of described yoke, and its internal diameter is greater than the external diameter of described moving iron core, described permanent magnet is positioned at the inboard or the outside of described magnetic conductor, or embeds the middle part of described magnetic conductor.
5. the quick operating mechanism of permanent-magnet breaker according to claim 4, it is characterized in that described yoke for dividing a body structure, comprise the yoke body of hollow columnar of both ends open and separating brake baffle plate that is provided with central through hole and the combined floodgate baffle plate that is fixedly connected on described yoke body upper/lower terminal.
6. according to the quick operating mechanism of claim 2,3,4 or 5 described permanent-magnet breakers, it is characterized in that described repulsion metal dish is a repulsion copper dish, mechanical structured member indirect securement directly fixedly connected or by other single or multiple parts compositions are connected between described output shaft and the described repulsion copper dish.
7. the quick operating mechanism of permanent-magnet breaker according to claim 6 is characterized in that described mechanical structured member is connecting rod and the described moving iron core that is fixed together.
8. the quick operating mechanism of permanent-magnet breaker according to claim 7, an end that it is characterized in that described moving iron core is provided with screwed hole of centre, and be threaded with described output shaft by this screwed hole, the other end of described moving iron core is provided with screwed hole of centre, and be threaded with described connecting rod by this screwed hole, the other end of described connecting rod is fixedlyed connected with described repulsion copper dish by thread connector.
9. the quick operating mechanism of permanent-magnet breaker according to claim 8, its feature communicates at the described screwed hole of centre at the two ends of described moving iron core.
10. the quick operating mechanism of permanent-magnet breaker according to claim 9, the straight Jing of the central through hole of its feature on described yoke is less than the diameter of described moving iron core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201732590U CN201478216U (en) | 2009-08-25 | 2009-08-25 | Quick control mechanism of permanent-magnetic circuit breaker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201732590U CN201478216U (en) | 2009-08-25 | 2009-08-25 | Quick control mechanism of permanent-magnetic circuit breaker |
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| CN201478216U true CN201478216U (en) | 2010-05-19 |
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| CN2009201732590U Expired - Fee Related CN201478216U (en) | 2009-08-25 | 2009-08-25 | Quick control mechanism of permanent-magnetic circuit breaker |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102184795A (en) * | 2011-04-12 | 2011-09-14 | 浙宝开关(杭州)有限公司 | Fast vacuum circuit breaker used for protecting high-power power electronic converter |
| CN102881493A (en) * | 2012-10-13 | 2013-01-16 | 福州天宇电气股份有限公司 | Electromagnetic vortex repulsion quick arc extinguishing switch |
| CN103532166A (en) * | 2013-09-17 | 2014-01-22 | 北京北变微电网技术有限公司 | Distributed photovoltaic intelligent grid connection box |
| CN105556630A (en) * | 2014-02-27 | 2016-05-04 | 株式会社东芝 | Switch operation mechanism |
| CN105761961A (en) * | 2016-04-06 | 2016-07-13 | 中国船舶重工集团公司第七〇二研究所 | Electromagnetic repulsion force mechanism |
| CN107452520A (en) * | 2017-07-11 | 2017-12-08 | 刘世峰 | Utilize the bistable state fast driving device of compound electric magnetic force |
| CN107946133A (en) * | 2017-12-06 | 2018-04-20 | 上海电气集团股份有限公司 | A kind of quick acting switching-off mechanism and hybrid AC breaker |
| CN110246732A (en) * | 2019-06-12 | 2019-09-17 | 华中科技大学 | A kind of electromagnetic repulsion mechanism coil based on fluting magnetic yoke |
| CN110429000A (en) * | 2019-09-03 | 2019-11-08 | 刘世峰 | A kind of compound operating mechanism of high speed electromagnetic permanent magnetism |
-
2009
- 2009-08-25 CN CN2009201732590U patent/CN201478216U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102184795A (en) * | 2011-04-12 | 2011-09-14 | 浙宝开关(杭州)有限公司 | Fast vacuum circuit breaker used for protecting high-power power electronic converter |
| CN102881493A (en) * | 2012-10-13 | 2013-01-16 | 福州天宇电气股份有限公司 | Electromagnetic vortex repulsion quick arc extinguishing switch |
| CN102881493B (en) * | 2012-10-13 | 2015-03-04 | 福州天宇电气股份有限公司 | Electromagnetic vortex repulsion quick arc extinguishing switch |
| CN103532166A (en) * | 2013-09-17 | 2014-01-22 | 北京北变微电网技术有限公司 | Distributed photovoltaic intelligent grid connection box |
| CN103532166B (en) * | 2013-09-17 | 2015-11-25 | 北京北变微电网技术有限公司 | Distributed photovoltaic intelligent grid connection box |
| CN105556630A (en) * | 2014-02-27 | 2016-05-04 | 株式会社东芝 | Switch operation mechanism |
| CN105761961A (en) * | 2016-04-06 | 2016-07-13 | 中国船舶重工集团公司第七〇二研究所 | Electromagnetic repulsion force mechanism |
| CN107452520A (en) * | 2017-07-11 | 2017-12-08 | 刘世峰 | Utilize the bistable state fast driving device of compound electric magnetic force |
| CN107946133A (en) * | 2017-12-06 | 2018-04-20 | 上海电气集团股份有限公司 | A kind of quick acting switching-off mechanism and hybrid AC breaker |
| CN110246732A (en) * | 2019-06-12 | 2019-09-17 | 华中科技大学 | A kind of electromagnetic repulsion mechanism coil based on fluting magnetic yoke |
| CN110429000A (en) * | 2019-09-03 | 2019-11-08 | 刘世峰 | A kind of compound operating mechanism of high speed electromagnetic permanent magnetism |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20170825 |
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| CF01 | Termination of patent right due to non-payment of annual fee |