The New Function Of Brakes

For elevators, the brake is both a working device and a safety device. With the development of technology and the improvement of energy conservation and environmental protection requirements, more and more permanent magnet synchronous gearless traction machines will replace traditional worm gear and worm traction machines. Therefore, there may be no need to install a separate upstream overspeed protection device. The brake of this type of permanent magnet synchronous gearless traction machine (which should undergo type testing) has an upstream overspeed protection function. According to the requirements of Article 9.10 of GB 7588-2003, the overspeed protection device for elevator cars is usually composed of two parts: speed monitoring element and deceleration execution element. The brake of permanent magnet synchronous gearless traction machine (all brake components involved in applying force to the brake wheels or discs are assembled in two parts, which are considered to have internal redundancy) is precisely used as the deceleration execution element to slow down or stop the elevator. Therefore, in the inspection, it is necessary to check whether the brake should have a type test certificate and report with upward overspeed protection function, whether the brake is directly rigidly connected to the traction wheel, and whether the electrical device should be used to verify the normal operation of the brake, but it does not need to be connected to the safety circuit. The braking performance of its upstream overspeed protection should also comply with the relevant requirements of Article 9.10 of GB 7588-2003.