Electric damping system for axial turbin motor rotor
A technology of mechanical brakes and armatures, used in elevators, hoisting devices, transportation and packaging, etc., can solve problems such as inability to use micro switches, insufficient precision, and unreliability
Active Publication Date: 2017-11-10
KONE CORP
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Problems solved by technology
However, the problem with using micro switches is that they cannot be used in every field of application because it is impossible to provide them with a space and / or an operating environment that makes it impossible to use micro switches
For example, the electromagnetic field of an electromagnet can cause challenges when using microswitches, which is the case in elevator brakes
Also, one problem with microswitches is that they are unreliable by default, and they have insufficient precision in many application areas
For example, in an elevator brake, the mutual movement of the armature part and the frame part measures 0.15 mm, but micro switches cannot detect such small movements with acceptable reliability
Furthermore, the fabrication of microswitches is challenging
Method used
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[0029] The specific examples provided in the description given below should not be construed as limiting the scope and / or applicability of the appended claims. The lists and groups of examples provided in the following description are not exhaustive unless expressly stated otherwise.
[0030] The invention is based at least in part on the utilization of at least one proximity sensor in an elevator solution, especially in a mechanical brake of an elevator. A proximity sensor is a type of sensor configured to detect the presence or absence of a target within the sensor's area of operation. There are different types of proximity sensors available. For example, the operation of a proximity sensor may be based on the capacitance between the sensor and the target or the inductance between the sensor and the target. Furthermore, photoelectric sensors can also be considered proximity sensors, since the reflection of transmitted light can be monitored and analyzed in order to detec...
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The present invention relates to a machinery brake for an elevator. The machinery brake comprises a frame part (120) comprising an electromagnet and an armature part (110), wherein the machinery brake further comprising an inductive proximity sensor (122) mounted to one of the following: the frame part (120), the armature part (110) and a target (124) mounted to the other of the following: the frame part (120), armature part (110). The inductive proximity sensor (122) and the target (124) are mounted with respect to each other so that in a normal state of the machinery brake the target (124) resides within an operational area of the inductive proximity sensor (122) and in an abnormal state of the machinery brake the target (124) resides at least partly outside the operational area of the inductive proximity sensor (122). The invention also relates to a method therein.
Description
technical field [0001] The present invention generally relates to the technical field of elevators. More specifically, the invention relates to monitoring solutions for mechanical brakes in elevators. Background technique [0002] An elevator includes an elevator traction machine implementing a mechanical brake. The mechanical brake is mechanically engaged with the rotating part of the traction machine to produce a braking effect. The mechanical brakes may eg be shoe brakes, drum brakes or disc brakes. [0003] A mechanical brake is generally constructed such that it comprises an armature part provided with brake pads and a frame part comprising an electromagnet. One or more springs are arranged between the armature part and the frame part. The operation of the mechanical brake is based on the use of springs arranged to push the part of the armature provided with the brake pads against the braking surface of the rotating part of the traction machine to achieve the brakin...
Claims
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IPC IPC(8): B66B5/02B66D5/08
CPCB66B5/0031B66B5/02B66D5/08B66B1/32B66B5/00B66B1/36B66B3/00B66B5/0025
Inventor H.瓦卡梅基J.罗西T.科尔霍宁Z.严
Owner KONE CORP