Patent Application
20170283215
The present disclosure is generally related to braking and/or safety systems for elevator systems and, more specifically, an electronic safety device with a power assembly.
Some machines, such as an elevator system, include a safety system to stop the machine when it rotates at excessive speeds or the elevator cab travels at excessive speeds or accelerations. Conventional safety systems include an actively applied safety system that requires power from travelling cables to positively actuate the safety mechanism or a passively applied safety system that requires power from travelling cables to maintain the safety system in a hold operating state. There is therefore a need for a more robust safety system with reduced complexity and power requirements for reliable operation without the need of additional travelling cables or additional power wires to the elevator car and/or counterweight.
In one aspect, an elevator system is provided. The elevator system includes a hoistway, an elevator component disposed in the hoistway, and a power assembly disposed in the hoistway. The power assembly includes a first power component disposed in the hoistway, the first power component including a first power connection, and a second power component operably coupled to the elevator component; wherein the first power component is configured to provide wireless power to the second power component.
In an embodiment, the elevator component comprises at least one of an elevator car and a counterweight. In an embodiment, the elevator system further includes an elevator drive operably coupled to the elevator car.
In an embodiment, the second power component is configured to connect to the first power component via a direct connection or an indirect connection. In an embodiment, the first power component is operably coupled to a power source.
In an embodiment, the second power component includes a second power connection, a power storage device operably coupled to the second power connector, and a safety actuation controller including a communication module, the safety actuation controller operably coupled to the power storage device. In an embodiment, the communication module is configured to wirelessly exchange safety signals with the elevator controller.
In an embodiment, the elevator system further includes a guide rail disposed in the hoistway; the guide rail configured to engage the elevator component and direct the course of travel of the elevator component. In an embodiment, the first power component is operably coupled to the guide rail.
In an embodiment, the elevator system further includes a safety actuation device operably coupled to the elevator component, the safety actuation device configured to engage the guide rail. In an embodiment, the second power component is operably coupled to the safety actuation device.
In one aspect, an elevator safety actuation device is provided. The elevator safety actuation device includes a power component and an electromagnetic component operably connected to the power component, wherein the electromagnetic component is configured generate an actuation or a reset. The power component includes a safety actuation controller, a power storage device operably coupled to the safety actuation controller, and a first connector operably coupled to the first power storage device.
In an embodiment, the electronic safety device further includes a magnetic brake disposed adjacent to the electromagnetic component, the magnetic brake configured to move between an engaging position and a non-engaging position based in part on a holding force.
In an embodiment, the safety controller comprises a communication module. In an embodiment, the communication module is configured to wirelessly receive and transmit safety signals.
In an embodiment, the elevator safety device further includes a second connector configured to engage the first connector. In an embodiment, the second connector is removable.
The embodiments and other features, advantages and disclosures contained herein, and the manner of attaining them, will become apparent and the present disclosure will be better understood by reference to the following description of various exemplary embodiments of the present disclosure taken in conjunction with the accompanying drawings, wherein:
For the purposes of promoting an understanding of the principles of the present disclosure, reference will now be made to the embodiments illustrated in the drawings, and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of this disclosure is thereby intended.
Movement of the elevator car 12 and counterweight 20 in the hoistway 16 is provided by a motor 24 mounted in a machine room 26. The motor 24 rotates a sheave 28 around which the cable 14 extends to raise and lower the elevator car 12.
An electromechanical brake (not shown) located in the machine room 26, electronic safety actuation devices, car safeties 34, and/or counterweight safeties 36 act to stop elevator car 12 and counterweight 20 if the elevator car 12 or counterweight 20 exceed a set speed as it travels inside the hoistway 16. If the elevator car 12 or counterweight 20 reaches a defined over-speed condition; thus, transmitting a signal to an elevator drive 38, which in turn cuts power to the elevator drive 38 and drops the brake to arrest movement of the sheave 28 and thereby arrest movement of elevator car 12.
If, however, cables 14 break or the elevator car 12 otherwise experiences a free-fall condition unaffected by the brake, the electronic safety actuation device may then act to actuate either or both of the car safety 34 and counterweight safety 36 to arrest movement of the elevator car 12 and/or counterweight 20.
In order to power the electromagnetic component 40, the power assembly 32 is disposed within the hoistway 16. The power assembly 32 includes a first power component 44 configured to provide power to a second power component 46, wherein the second power component 46 is disposed on at least one of the elevator car 12 and the counterweight 20.
In an embodiment, the first power component 44 is configured to provide power to the second power component 46 via a direct connection or an indirect connection. For example, the first power component 44 may connect to the second power component 46 via a plug and socket connector, inductive charging, conductive charging, wireless power, and/or an outlet to name a few non-limiting examples.
The first power component 44 includes a first component connector 48, and the second power component 46 includes a second component connector 50, such that when the first component connector 48 and the second component connector 50 are connected, power is transferred from the first power component 44 to the second power component 46.
The second power component 46 further includes a first power storage device 52 operably coupled to the second component connector 50. The first power storage device 52, for example a battery to name one non-limiting example, is further coupled to an electronic safety actuation device controller 54. The electronic safety actuation device controller 54 is further coupled to a second power storage device 56. The second power storage device 56, for example a capacitor to name one non-limiting example, is further coupled to a portion of the electronic safety actuation device (e.g., the electromagnetic component 40), and is configured to activate the safety actuation device based in part on an actuation command.
The electronic safety actuation device controller 54 is in communication with the elevator drive 38 via a communication module (not shown) disposed on the electronic safety actuation device controller 54. In an embodiment, the communication module is configured to wirelessly exchange safety signals with the elevator drive 38. It will be appreciated that the communication module may be separate from the electronic safety actuation controller 54.
In an embodiment, the first power component 44 may be disposed within the hoistway 16 and operably coupled to the power source without the need of a traveling cable. In the embodiment shown in
In an embodiment, the first power component 44 may be placed at locations along the hoistway 16 corresponding to positions of the counterweight 20 when the elevator car 12 is stopped at each of the floors in the building, or at some subset of floors.
In another embodiment, as shown in
During typical operation, the electromagnetic component 40 is a keeper configured to hold the magnetic brake 42 in a non-engaging position without power needed. The magnetic brake 42 provides a sufficient magnetic attraction force in a direction toward the electromagnetic component 40 to hold the magnetic brake 42 in the non-engaging position.
During an overspeed or other condition requiring braking, the elevator drive 38 may wirelessly transmit a safety signal to the electronic safety actuation device controller 54 to actuate the electromagnetic component 40. In one embodiment, the electronic safety actuation device controller 54 may itself sense the overspeed or other condition requiring braking and actuate the electromagnetic component 40. Upon receipt of the safety signal, the electronic safety actuation device controller 54 may issue an actuation command to the electromagnetic component 40 to propel the magnetic brake 42 towards a guide rail into an engaging position by using the power from the second power storage device 56.
In the rail-engaging position, illustrated in
The first power storage device 52 is able to maintain or restore the stored power when the first component connector 48 is connected to the second component connector 50. This is accomplished when the first power component 44 is positioned to be adjacent to the second power component 46 such that the first component connector 48 may engage or mate with the second component connector 50. For example, when the elevator car 12 is stationary at a landing (e.g., top) or running in the hoistway 16, the first power component 44 is positioned to be adjacent to the second power component 46 such that the first component connector 48 may engage or mate with the second component connector 50. Power may then be transferred from the first power component 44 to the first power storage device 52 via the second power connector 50. This arrangement, therefore, eliminates the need for a travelling cable to power the electronic safety actuation device (connected to the car safety 34 and/or connected to the counterweight safety 36).
It will therefore be appreciated that the present elevator system 10 includes a power assembly 32 employed on an electronic safety actuation device (connected to car safeties 34, and/or counterweight safeties 36) to actuate the safety without the need of additional traveling cables for power; thus, decreasing the costs of material and installation time of the elevator system 10.
While the disclosure has been illustrated and described in detail in the drawings and foregoing description, the same is to be considered as illustrative and not restrictive in character, it being understood that only certain embodiments have been shown and described and that all changes and modifications that come within the spirit of the disclosure are desired to be protected.
