WO2012011903A1 - Magnetic governor device for use in an elevator system - Google Patents
Magnetic governor device for use in an elevator system Download PDFInfo
- Publication number
- WO2012011903A1 WO2012011903A1 PCT/US2010/042834 US2010042834W WO2012011903A1 WO 2012011903 A1 WO2012011903 A1 WO 2012011903A1 US 2010042834 W US2010042834 W US 2010042834W WO 2012011903 A1 WO2012011903 A1 WO 2012011903A1
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- WO
- WIPO (PCT)
- Prior art keywords
- magnets
- elongated
- governor member
- conductive material
- elevator car
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
- B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
- B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
- B66B5/06—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed electrical
Definitions
- Elevator systems include various devices that control speed of the elevator car.
- the elevator machine includes a motor and brake that operate to control the movement of the elevator car within the hoistway under normal operating conditions. Occasionally an elevator car may move at a speed that is above a desired speed. There are known devices for guarding against such overspeed conditions.
- Typical elevator systems include a governor that will activate a brake to stop movement of the elevator car during an overspeed condition.
- Typical governor configurations include a governor rope that moves around a loop established by a governor sheave and a tension sheave at opposite ends of the hoistway. The governor rope is coupled with the elevator car so that the governor rope moves as the elevator car moves. Movement of the governor rope facilitates operation of a governor device. When a governor rope is moving at a speed corresponding to an elevator car overspeed condition, the governor operates to activate a brake mounted on the car that grips the guiderail.
- An exemplary elevator governor device includes an elongated governor member that is configured to remain stationary in a fixed position within an elevator hoistway.
- the elongated governor member includes an electrically conductive material.
- a plurality of magnets are configured to be supported for movement with an elevator car that moves within the hoistway.
- the magnets surround the elongated governor member and are configured to induce eddy currents in the electrically conductive material as the magnets move relative to the elongated governor member responsive to movement of the elevator car within the hoistway.
- the induced eddy currents result in a force that resists movement of the magnets relative to the elongated governor member.
- a plurality of conductive plates are adjacent the magnets for directing magnetic flux from the magnets into the conductive material of the elongated governor member.
- An exemplary elevator system includes an elevator car that is moveable within a hoistway.
- An elongated governor member remains stationary in the hoistway and comprises an electrically conductive material.
- a magnetic brake activator is supported on the elevator car to move along the governor member as the elevator car moves relative to the elongated governor member.
- the magnetic brake activator includes a plurality of magnets that surround the elongated governor member and induce eddy currents in the conductive material as the elevator car moves. The eddy currents result in a force that resists movement of the brake activator relative to the elongated governor member. The force increases as a speed of movement of the elevator car increases.
- a brake is supported on the elevator car and is activated responsive to relative movement between the magnetic brake activator and the elevator car resulting from the force increasing to an amount corresponding to a threshold elevator car speed.
- An exemplary method of controlling movement of an elevator car includes situating an elongated governor member in a stationary position.
- a magnetic brake activator is supported on the elevator car for movement with the elevator car.
- the magnetic brake activator includes a plurality of magnets that surround the elongated governor member. Eddy currents are induced in a conductive material of the elongated governor member by moving the elevator car relative to the elongated governor member to thereby produce a force that tends to resist movement of the brake activator relative to the elongated governor member. The force increases as a speed of movement of the elevator car increases.
- a brake supported on the elevator car is activated responsive to relative movement between the magnetic brake activator and the elevator car resulting from the force increasing to an amount corresponding to a threshold elevator car speed.
- Figure 1 schematically illustrates selected portions of an elevator system.
- Figure 2 is a diagrammatic, partially cut away illustration of an example elongated governor member and magnetic brake activator member designed according to an embodiment of this invention.
- FIG. 3 is an exploded view of the example of Figure 2.
- FIG 1 schematically illustrates selected portions of an elevator system 20.
- An elevator car 22 is situated within a hoistway 24 for movement in a generally known manner.
- An elongated governor member 30 is situated in a fixed position where the elongated governor member 30 remains stationary within the hoistway 24.
- This example includes one end 32 fixed near a top of the hoistway 24 and a second end 34 in a fixed position near a bottom of the hoistway 24.
- the elongated governor member 30 in one example comprises a rope including an electrically conductive material such as copper.
- an electrically conductive material such as copper.
- One example includes a copper coating along an exterior or outer surface of the rope. The rope is held taut in a fixed position within the hoistway 24.
- Another example includes a flexible tube as the elongated governor member.
- Another example includes a rigid rod as the elongated governor member.
- a magnetic brake activator 40 is supported on the elevator car 22 to move with the elevator car within the hoistway 24.
- a coupling mechanism 42 allows for the magnetic brake activator 40 to be supported on the elevator car 22 so that the magnetic brake activator 40 moves with the elevator car 22 during normal operating conditions.
- the magnetic brake activator 40 induces eddy currents in the conductive material of the elongated governor member 30 as the elevator car 22 moves along the hoistway 24 and the magnetic brake activator 40 moves relative to the elongated governor member 30.
- One feature of the example of Figure 1 is that no moving governor rope is required. Instead, a stationary elongated governor member 30 remains in a fixed position within the hoistway 24. This eliminates any dynamic effects that may have otherwise been introduced into the example elevator system 20 if a conventional governor arrangement including a rope that moves along a loop were used.
- the magnetic brake activator 40 is configured to provide brake activation at a selected elevator car speed. There is no variation in the tripping speed of the example arrangement as may occur with conventional governors. Given this description, those skilled in the art will be able to select components to achieve sufficient forces to activate the brakes 46 at a selected threshold speed.
- FIG. 2 illustrates one example governor device configuration.
- the elongated governor member 30 comprises a rope 50 having a coating or sleeve of an electrically conductive material 52 on an outer surface of the rope 50.
- the electrically conductive material comprises copper.
- the example brake activator 40 includes a plurality of magnets that surround the elongated governor member 30.
- the magnets are situated to have magnetic north in a particular orientation that facilitates magnetic flux penetrating the conductive material 52 of the elongated governor member 30 to induce eddy currents in that material to provide the force that will tend to resist movement of the magnets relative to the elongated governor member 30.
- Figures 2 and 3 show example magnets 54 and 56 that each comprise an annular disk body. Additional magnets 58 and 60 are positioned near the magnets 54 and 56. The magnets 54 and 56 both have magnetic north facing in the same direction, as shown schematically by the arrow 62. The magnets 58 and 60 have magnetic north facing in an opposite direction, as schematically shown by the arrow 64.
- a plurality of plates are provided with the magnets for directing magnetic flux from the magnets into the conductive material 52 of the elongated governor member 30.
- a plate 70 is positioned on one side of the magnet 54.
- a plate 72 is positioned on an opposite side of the magnet 56. The plate 72 directs flux from the magnets 54 and 56 into the conductive material 52 and the plate 70 directs flux from the conductive material 52 back toward the magnet 54.
- a plate 74 directs magnetic flux from the magnets 58 and 60 into the conductive material 52.
- a plate 76 facilitates directing magnetic flux from the conductive material 52 back toward the magnet 60.
- the plates 70, 72, 74 and 76 comprise steel.
- the illustrated example plates comprise annular disks. Other geometries are possible such as square plates.
- the cross-section of the elongated governor member 30 may also be square in such an example.
- the plates include a central opening 80 that has a dimension that is slightly larger than an outer dimension of the elongated governor member 30. This provides a relatively small gap between the elongated governor member 30 and the plates. A relatively small gap facilitates increased magnetic flux penetration into the conductive material 52.
- the example magnets have a relatively larger inside dimension 82 that is spaced further from the exterior of the elongated governor member 30 compared to the spacing between the conductive material 52 and the central opening 80 of the plates.
- the larger gap between the magnets 52-60 and the conductive material 52 is intended to direct the entire magnetic flux to the plates 70- 76 and through the conductive layer 52.
- the larger inside dimension of the magnets 52-60 reduces the amount of parasitic leakage flux that would otherwise occur if the spacing between the magnets and the governor member 30 were the same as the spacing between the plates and the governor member 30.
- the illustrated example includes a housing 90 that supports the magnets and plates in a desired alignment and orientation.
- the housing 90 comprises a material such as aluminum, which does not have a high magnetic permeability.
- the housing 90 also is configured to facilitate connection between the brake activator 40 and the coupling mechanism 42 to secure the brake activator 40 to the structure of the elevator car 22.
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- Maintenance And Inspection Apparatuses For Elevators (AREA)
Abstract
An exemplary elevator governor device includes an elongated governor member that is configured to remain stationary in a fixed position within an elevator hoistway. The elongated governor member includes an electrically conductive material. A plurality of magnets are configured to be supported for movement with an elevator car that moves within the hoistway. The magnets surround the elongated governor member and are configured to induce eddy currents in the electrically conductive material as the magnets move relative to the elongated governor member responsive to movement of the elevator car within the hoistway. The induced eddy currents result in a force that resists movement of the magnets relative to the elongated governor member. A plurality of conductive plates are adjacent the magnets for directing magnetic flux from the magnets into the conductive material of the elongated governor member.
Description
MAGNETIC GOVERNOR DEVICE FOR USE IN AN ELEVATOR SYSTEM
BACKGROUND
[oooi] Elevator systems include various devices that control speed of the elevator car. The elevator machine includes a motor and brake that operate to control the movement of the elevator car within the hoistway under normal operating conditions. Occasionally an elevator car may move at a speed that is above a desired speed. There are known devices for guarding against such overspeed conditions.
[0002] Typical elevator systems include a governor that will activate a brake to stop movement of the elevator car during an overspeed condition. Typical governor configurations include a governor rope that moves around a loop established by a governor sheave and a tension sheave at opposite ends of the hoistway. The governor rope is coupled with the elevator car so that the governor rope moves as the elevator car moves. Movement of the governor rope facilitates operation of a governor device. When a governor rope is moving at a speed corresponding to an elevator car overspeed condition, the governor operates to activate a brake mounted on the car that grips the guiderail.
[0003] Although known governor devices have proven useful, they are not without shortcomings. For example, the tripping speed of some governor systems varies based upon the instantaneous orientation of the governor sheave. Having a governor loop in the hoistway introduces dynamic effects especially when the hoistway is relatively tall. As the rise of the building increases, the dynamic effects of the governor loop also increase. Such dynamic effects introduce complexities into elevator system design and operation.
SUMMARY
[000 ] An exemplary elevator governor device includes an elongated governor member that is configured to remain stationary in a fixed position within an elevator hoistway. The elongated governor member includes an electrically conductive material. A plurality of magnets are configured to be supported for movement with an elevator car that moves within the hoistway. The magnets surround the elongated governor member and are configured to induce eddy currents
in the electrically conductive material as the magnets move relative to the elongated governor member responsive to movement of the elevator car within the hoistway. The induced eddy currents result in a force that resists movement of the magnets relative to the elongated governor member. A plurality of conductive plates are adjacent the magnets for directing magnetic flux from the magnets into the conductive material of the elongated governor member.
[0005] An exemplary elevator system includes an elevator car that is moveable within a hoistway. An elongated governor member remains stationary in the hoistway and comprises an electrically conductive material. A magnetic brake activator is supported on the elevator car to move along the governor member as the elevator car moves relative to the elongated governor member. The magnetic brake activator includes a plurality of magnets that surround the elongated governor member and induce eddy currents in the conductive material as the elevator car moves. The eddy currents result in a force that resists movement of the brake activator relative to the elongated governor member. The force increases as a speed of movement of the elevator car increases. A brake is supported on the elevator car and is activated responsive to relative movement between the magnetic brake activator and the elevator car resulting from the force increasing to an amount corresponding to a threshold elevator car speed.
[0006] An exemplary method of controlling movement of an elevator car includes situating an elongated governor member in a stationary position. A magnetic brake activator is supported on the elevator car for movement with the elevator car. The magnetic brake activator includes a plurality of magnets that surround the elongated governor member. Eddy currents are induced in a conductive material of the elongated governor member by moving the elevator car relative to the elongated governor member to thereby produce a force that tends to resist movement of the brake activator relative to the elongated governor member. The force increases as a speed of movement of the elevator car increases. A brake supported on the elevator car is activated responsive to relative movement between the magnetic brake activator and the elevator car resulting from the force increasing to an amount corresponding to a threshold elevator car speed.
[0007] The various features and advantages of this invention will become apparent to those skilled in the art from the following detailed description. The drawings that accompany the detailed description can be briefly described as follows.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 schematically illustrates selected portions of an elevator system.
[0009] Figure 2 is a diagrammatic, partially cut away illustration of an example elongated governor member and magnetic brake activator member designed according to an embodiment of this invention.
[oooio] Figure 3 is an exploded view of the example of Figure 2. DETAILED DESCRIPTION
[oooii] Figure 1 schematically illustrates selected portions of an elevator system 20. An elevator car 22 is situated within a hoistway 24 for movement in a generally known manner. An elongated governor member 30 is situated in a fixed position where the elongated governor member 30 remains stationary within the hoistway 24. This example includes one end 32 fixed near a top of the hoistway 24 and a second end 34 in a fixed position near a bottom of the hoistway 24.
[00012] The elongated governor member 30 in one example comprises a rope including an electrically conductive material such as copper. One example includes a copper coating along an exterior or outer surface of the rope. The rope is held taut in a fixed position within the hoistway 24.
[00013] Another example includes a flexible tube as the elongated governor member. Another example includes a rigid rod as the elongated governor member.
[0001 ] A magnetic brake activator 40 is supported on the elevator car 22 to move with the elevator car within the hoistway 24. A coupling mechanism 42 allows for the magnetic brake activator 40 to be supported on the elevator car 22 so that the magnetic brake activator 40 moves with the elevator car 22 during normal operating conditions. The magnetic brake activator 40 induces eddy currents in the conductive material of the elongated governor member 30 as the elevator car 22 moves along the hoistway 24 and the magnetic brake activator 40 moves relative to the elongated governor member 30.
[00015] The induced eddy currents result in a force that tends to resist movement of the magnetic brake activator 40 relative to the elongated governor member 30. Under most elevator operating conditions, the level of resulting forces is
low enough that the magnetic brake activator 40 moves through the hoistway 24 at the same speed as the elevator car 22.
[00016] During an overspeed condition, after the elevator car has exceeded a threshold speed, the resulting forces are strong enough to resist movement of the brake activator 40 in a manner that causes relative movement between the brake activator 40 and the elevator car 22. Such relative movement, which is accommodated by the coupling mechanism 42, causes movement of a linkage 44 that activates brakes 46 that are supported on the elevator car 22. The brakes 46 operate in a known manner to slow down or stop the elevator car 22. For example, the brakes 46 grip onto guiderails (not illustrated).
[00017] One feature of the example of Figure 1 is that no moving governor rope is required. Instead, a stationary elongated governor member 30 remains in a fixed position within the hoistway 24. This eliminates any dynamic effects that may have otherwise been introduced into the example elevator system 20 if a conventional governor arrangement including a rope that moves along a loop were used. Another feature of the example of Figure 1 is that the magnetic brake activator 40 is configured to provide brake activation at a selected elevator car speed. There is no variation in the tripping speed of the example arrangement as may occur with conventional governors. Given this description, those skilled in the art will be able to select components to achieve sufficient forces to activate the brakes 46 at a selected threshold speed.
[00018] Figure 2 illustrates one example governor device configuration. In this example, the elongated governor member 30 comprises a rope 50 having a coating or sleeve of an electrically conductive material 52 on an outer surface of the rope 50. In one example, the electrically conductive material comprises copper.
[00019] The example brake activator 40 includes a plurality of magnets that surround the elongated governor member 30. The magnets are situated to have magnetic north in a particular orientation that facilitates magnetic flux penetrating the conductive material 52 of the elongated governor member 30 to induce eddy currents in that material to provide the force that will tend to resist movement of the magnets relative to the elongated governor member 30.
[00020] Figures 2 and 3 show example magnets 54 and 56 that each comprise an annular disk body. Additional magnets 58 and 60 are positioned near the magnets 54 and 56. The magnets 54 and 56 both have magnetic north facing in the same
direction, as shown schematically by the arrow 62. The magnets 58 and 60 have magnetic north facing in an opposite direction, as schematically shown by the arrow 64.
[00021] A plurality of plates are provided with the magnets for directing magnetic flux from the magnets into the conductive material 52 of the elongated governor member 30. In this example, a plate 70 is positioned on one side of the magnet 54. A plate 72 is positioned on an opposite side of the magnet 56. The plate 72 directs flux from the magnets 54 and 56 into the conductive material 52 and the plate 70 directs flux from the conductive material 52 back toward the magnet 54. Similarly, a plate 74 directs magnetic flux from the magnets 58 and 60 into the conductive material 52. A plate 76 facilitates directing magnetic flux from the conductive material 52 back toward the magnet 60.
[00022] In one example, the plates 70, 72, 74 and 76 comprise steel. The illustrated example plates comprise annular disks. Other geometries are possible such as square plates. The cross-section of the elongated governor member 30 may also be square in such an example.
[00023] As can best be appreciated from Figure 3, the plates include a central opening 80 that has a dimension that is slightly larger than an outer dimension of the elongated governor member 30. This provides a relatively small gap between the elongated governor member 30 and the plates. A relatively small gap facilitates increased magnetic flux penetration into the conductive material 52.
[0002 ] The example magnets, on the other hand, have a relatively larger inside dimension 82 that is spaced further from the exterior of the elongated governor member 30 compared to the spacing between the conductive material 52 and the central opening 80 of the plates. The larger gap between the magnets 52-60 and the conductive material 52 is intended to direct the entire magnetic flux to the plates 70- 76 and through the conductive layer 52. The larger inside dimension of the magnets 52-60 reduces the amount of parasitic leakage flux that would otherwise occur if the spacing between the magnets and the governor member 30 were the same as the spacing between the plates and the governor member 30.
[00025] The illustrated example includes a housing 90 that supports the magnets and plates in a desired alignment and orientation. In one example, the housing 90 comprises a material such as aluminum, which does not have a high magnetic permeability. The housing 90 also is configured to facilitate connection
between the brake activator 40 and the coupling mechanism 42 to secure the brake activator 40 to the structure of the elevator car 22.
[00026] The preceding description is exemplary rather than limiting in nature. Variations and modifications to the disclosed examples may become apparent to those skilled in the art that do not necessarily depart from the essence of this invention. The scope of legal protection given to this invention can only be determined by studying the following claims.
Claims
1. An elevator governor device, comprising:
an elongated governor member that is configured to remain stationary in a fixed position within an elevator hoistway, the elongated governor member comprising an electrically conductive material;
a plurality of magnets that are configured to be supported for movement with a mass that moves within the hoistway, the plurality of magnets surrounding the elongated member, the plurality of magnets configured to induce eddy currents in the electrically conductive material of the elongated governor member as the magnets move relative to the elongated governor member as the mass moves within the hoistway, the induced eddy currents resulting in a force that resists movement of the magnets along the elongated governor member; and
a plurality of conductive plates that are adjacent the magnets for directing magnetic flux from the magnets into the conductive material of the elongated governor member.
2. The device of claim 1 , comprising
a housing surrounding the plurality of magnets, the housing configured to be coupled with a mechanism for activating a brake to stop movement of the mass within the hoistway.
3. The device of claim 1, wherein the plurality of magnets are configured such that magnetic north of a first one of the magnets is oriented in an opposite direction of magnetic north of an adjacent second one of the magnets, and wherein at least one of the plurality of conductive plates is between the first and second magnets.
4. The device of claim 3, wherein two of the plurality of conductive plates are situated between the first one and the second one of the plurality of magnets, one of the two plates being directly adjacent the first one of the magnets and directing magnetic flux from the first one of the magnets into the conductive material of the elongated governor member, another of the two plates being directly adjacent the second one of the magnets and directing magnetic flux from the second one of the magnets into the conductive material of the elongated governor member, and wherein two others of the conductive plates respectively on an opposite side of the first one and second one of the magnets directing magnetic flux from the conductive material back to the corresponding one of the magnets.
5. The device of claim 1, wherein the conductive material of the elongated governor member comprises a coating along an outer surface of the elongated governor member.
6. The device of claim 1, wherein the elongated governor member comprises a rope having a copper layer on an outer surface of the rope.
7. The device of claim 1, wherein each of the plurality of magnets has an annular disk shaped body.
8. The device of claim 7, wherein each of the plurality of conductive plates has an annular disk shaped body.
9. An elevator system, comprising:
an elevator car that is moveable within a hoistway;
a elongated governor member that remains stationary in the hoistway, the governor member comprising an electrically conductive material;
a magnetic brake activator that is supported on the elevator car to move along the governor member as the elevator car moves relative to the governor member, the magnetic brake activator comprising a plurality of magnets that surround the governor member and induce eddy currents in the conductive material as the elevator car moves relative to the governor member, resulting in a force that resists movement of the brake activator relative to the governor member, the force increasing as a speed of movement of the elevator car increases; and
a brake supported on the elevator car that is activated responsive to relative movement between the magnetic brake activator and the elevator car resulting from the force increasing to an amount corresponding to a threshold elevator car speed.
10. The elevator system of claim 9, wherein the elongated governor member comprises a first end in a fixed position near one end of the hoistway and a second end in a fixed position near a second end of the hoistway.
11. The elevator system of claim 9, wherein the electrically conductive material comprises a layer on an outer surface of the elongated governor member.
12. The elevator system of claim 11, wherein the elongated governor member comprises a rope having copper on the outer surface of the rope.
13. The elevator system of claim 9, wherein each of the plurality of magnets has an annular disk shaped body.
14. The elevator system of claim 13, wherein the magnetic brake activator comprises a plurality of plates each having an annular disk shaped body, the plates being adjacent the plurality of magnets for directing magnetic flux from the magnets to the elongated governor member.
15. The elevator system of claim 9, wherein the magnetic brake activator comprises a housing surrounding the plurality of magnets, the housing being configured to activate the brake to stop movement of the elevator car responsive to relative movement between the housing and the elevator car.
16. The elevator system of claim 9, wherein the magnetic brake activator comprises a plurality of conductive plates, a first one of the plates being adjacent one side of one of the magnets, a second one of the plates being adjacent an opposite side of the one of the magnets, the first plate directing magnetic flux from the one of the magnets into the conductive material of the elongated governor member, the second plate directing magnetic flux from the conductive material back toward the one of the magnets.
17. The elevator system of claim 9, wherein the plurality of magnets are situated such that magnetic north of a first one of the magnets is oriented in an opposite direction of an adjacent second one of the magnets, and at least one of the conductive plates is situated between the first and second magnets.
18. The elevator system of claim 17, wherein two of the conductive plates are situated between the first one and the second one of the magnets, one of the two plates being directly adjacent the first one of the magnets and directing magnetic flux from the first one of the magnets into the conductive material of the elongated governor member, the other of the two plates being directly adjacent the second one of the magnets between the one of the two plates and the second one of the magnets and directing magnetic flux from the second one of the magnets into the conductive material of the elongated governor member, and wherein two others of the conductive plates respectively on an opposite side of the first one and second one of the magnets directing magnetic flux from the conductive material back to the corresponding one of the magnets.
19. A method of controlling movement of an elevator car, comprising the steps of: situating an elongated governor member in a stationary position in an elevator hoistway, the elongated governor member comprising an electrically conductive material;
supporting a magnetic brake activator on the elevator car for movement with the elevator car, the magnetic brake activator comprising a plurality of magnets that surround the elongated governor member;
inducing eddy currents in the conductive material by moving the elevator car relative to the elongated governor member to thereby produce a force that tends to resist movement of the brake activator relative to the elongated governor member, the force being proportional to a speed of movement of the elevator car; and
activating a brake supported on the elevator car responsive to relative movement between the magnetic brake activator and the elevator car resulting from the force increasing to an amount corresponding to a threshold elevator car speed.
20. The method of claim 19, comprising
positioning a plurality of conductive plates adjacent the magnets; and directing magnetic flux through the plates from the magnets conductive material of the elongated governor member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2010/042834 WO2012011903A1 (en) | 2010-07-22 | 2010-07-22 | Magnetic governor device for use in an elevator system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/US2010/042834 WO2012011903A1 (en) | 2010-07-22 | 2010-07-22 | Magnetic governor device for use in an elevator system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2012011903A1 true WO2012011903A1 (en) | 2012-01-26 |
Family
ID=45497099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2010/042834 WO2012011903A1 (en) | 2010-07-22 | 2010-07-22 | Magnetic governor device for use in an elevator system |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2012011903A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020134225A1 (en) * | 2018-12-29 | 2020-07-02 | 刘英辉 | Linear driving apparatus, safety gear apparatus, and method for controlling elevator system |
| US11407614B2 (en) * | 2017-03-08 | 2022-08-09 | Sabanci Universitesi | Nonlinear and efficient eddy-current overspeed protection system for elevators |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467850A (en) * | 1993-12-16 | 1995-11-21 | Otis Elevator Company | Permanent magnet, magnetodynamic safety brake for elevators and the like |
| US6345696B1 (en) * | 1999-05-27 | 2002-02-12 | Mitsubishi Denki Kabushiki Kaisha | Elevator speed governor |
| JP3390578B2 (en) * | 1995-07-26 | 2003-03-24 | 三菱電機株式会社 | Elevator governor |
-
2010
- 2010-07-22 WO PCT/US2010/042834 patent/WO2012011903A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5467850A (en) * | 1993-12-16 | 1995-11-21 | Otis Elevator Company | Permanent magnet, magnetodynamic safety brake for elevators and the like |
| JP3390578B2 (en) * | 1995-07-26 | 2003-03-24 | 三菱電機株式会社 | Elevator governor |
| US6345696B1 (en) * | 1999-05-27 | 2002-02-12 | Mitsubishi Denki Kabushiki Kaisha | Elevator speed governor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11407614B2 (en) * | 2017-03-08 | 2022-08-09 | Sabanci Universitesi | Nonlinear and efficient eddy-current overspeed protection system for elevators |
| WO2020134225A1 (en) * | 2018-12-29 | 2020-07-02 | 刘英辉 | Linear driving apparatus, safety gear apparatus, and method for controlling elevator system |
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