{"id":12753,"date":"2019-06-17T06:00:13","date_gmt":"2019-06-17T05:00:13","guid":{"rendered":"https:\/\/www.engineernewsnetwork.com\/blog\/?p=12753"},"modified":"2019-06-12T10:12:02","modified_gmt":"2019-06-12T09:12:02","slug":"contactless-sensor-improves-monitoring-of-brakes","status":"publish","type":"post","link":"https:\/\/www.engineernewsnetwork.com\/blog\/contactless-sensor-improves-monitoring-of-brakes\/","title":{"rendered":"Contactless sensor improves monitoring of brakes"},"content":{"rendered":"\n

Warner Electric<\/a><\/strong> has developed an innovative technology for monitoring electromagnetic brakes in elevators.\u00a0<\/p>\n\n\n\n

Backwards compatible with conventional electromechanical microswitches, but with none of their inherent limitations, the patent-pending WES contactless sensor brings improved reliability to electromagnetic brake monitoring, and adds the capability for predictive maintenance, eliminating unscheduled downtime.<\/p>\n\n\n\n

Electromagnetic brakes have become a popular option for elevators, as well as for lifts and winches in stage and theatre applications. <\/p>\n\n\n\n

The design of brakes for such applications is covered under the European standards EN81-20:2014 and EN81-50:2014 and the US standard ASME A17.1, which specify that proximity sensors must be incorporated into the brakes to provide verification that the brake has actually engaged or disengaged.<\/p>\n\n\n\n

Traditionally this function has been accomplished using snap action, dry contact microswitches, with their popularity based on their simple mechanical architecture and compatibility with different current and voltage requirements. <\/p>\n\n\n\n

\"\"
Electromagnetic brakes have become a popular option for elevators, as well as for lifts and winches in stage and theatre applications<\/figcaption><\/figure>\n\n\n\n

But the prevalence of PLC control in modern applications mean the current and voltage handling is of minimal advantage, while mechanical failure due to vibration and from the non-conductive contamination oxide layer that tends to form on the gold alloy contacts in lower voltage applications increase the servicing requirements on the brakes. <\/p>\n\n\n\n

There are also environmental concerns about pollution from the silicon in the contact alloy.\u00a0<\/p>\n\n\n\n

Further, while the hysteresis cycle is typically around 0.05mm, the susceptibility to mechanical vibration and pollution means the stroke has to be increased to provide a greater \u2018displacement margin\u2019 around the hysteresis points which increase over the product life and to prevent drift of switch point.<\/p>\n\n\n\n

Inductive switches address many of these issues, providing non-contact operation that is free from wear, and being insensitive to vibration, dust and moisture. <\/p>\n\n\n\n

But temperature range is limited, and the switching point can drift with temperature. <\/p>\n\n\n\n

Further, strong magnetic fields can saturate the core of the sensor, altering the switch point or creating uncontrolled switching of the sensor. <\/p>\n\n\n\n

Finally, while the solid state output is fully compatible with modern PLC control systems, there is no backwards compatibility with the simple NO\/NC dry contact switch based systems that are still prevalent within the elevator industry.<\/p>\n\n\n\n

To address these issues, Warner Electric has developed a new technology for reliable, wear-free, shielded detection of brake engagement\/disengagement. <\/p>\n\n\n\n

Fully compatible with the requirements of EN81-20:2014, EN81-50:2014 and ASME A17.1, the design offers a highly accurate and repeatable switching point combined with very low hysteresis (0.03mm) over a wide temperature from -40\u00b0C to +105\u00b0C.\u00a0<\/p>\n\n\n\n

The low hysteresis and elimination of drift of the switch point with temperature means that sensing distance is no longer a constraint in brake design, enabling the brake air gap to be reduced to as little as 0.15mm, giving increased braking torque.<\/p>\n\n\n\n

Three output options are available, including an NC\/NO output that is fully backwards compatible with existing dry contact switching circuits used with traditional microswitches. <\/p>\n\n\n\n

The WES also provides NPN or solid state outputs compatible with PLC interfaces, along with an analogue output that provides a voltage proportional to absolute stroke\/air gap position. This enables wear to be monitored as part of a predictive maintenance strategy.<\/p>\n\n\n\n

Fully integrated into the brake inductor itself, and so into the brake magnetic field, this new sensing solution is shielded and immune to any kind of external magnetic field. <\/p>\n\n\n\n

Further increasing reliability in operation, the WES incorporates protection against reverse polarity, over-current, over-temperature and over-voltage.<\/p>\n","protected":false},"excerpt":{"rendered":"

Warner Electric has developed an innovative technology for monitoring electromagnetic brakes in elevators.\u00a0 Backwards compatible with conventional electromechanical microswitches, but with none of their inherent limitations, the patent-pending WES contactless sensor brings improved reliability to electromagnetic brake monitoring, and adds the capability for predictive maintenance, eliminating unscheduled downtime. Electromagnetic brakes have become a popular option …<\/p>\n","protected":false},"author":1,"featured_media":12754,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[6486,6487,1064],"class_list":["post-12753","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-design","tag-contactless-sensor","tag-monitoring-of-brakes","tag-warner-electric"],"yoast_head":"\nContactless sensor improves monitoring of brakes - Engineer News Network<\/title>\n<meta name=\"description\" content=\"The WES contactless sensor brings improved reliability to electromagnetic brake monitoring, and adds the capability for predictive maintenance, eliminating unscheduled downtime\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.engineernewsnetwork.com\/blog\/contactless-sensor-improves-monitoring-of-brakes\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contactless sensor improves monitoring of brakes - 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