Permanent magnet synchronous motor in the elevator of the security and reliability of the development and application

Permanent magnet synchronous motor in elevator design,production,development and utilization,are increased highland elevator traction system security and reliability.When traction and braking failure or other failure cause the elevator upward slide line direction,and speed,it has safety protection,meet the technical standards of GB7588-2003 (elevator manufacture and install security specification 9.10 capsules upgoing overspeed protection device requirements.The use of permanent magnet wholesalemotor.blogspot.com synchronous traction motor of elevator,lost in the TV and remove the dot will grow motor armature winding short section (or short after concatenated adjustable resistor),when a speeding (regardless of upward and downward) failure,speed control system detected signals,immediately cut off power supply circuit of controller,and the motor armature winding short answer (or short after series adjustable resistor).

At this point,the stillness of the winding cutting rotating magnetic fields produced by permanent magnet and the induction electromotive force,caused by the armature winding in closed loop current,the current in the magnetic field under the action of torque,attempt to drive the armature low speed permanent magnet generator winding with magnetic rotation; at the same time,the torque is the moment of the effect on the rotor magnetic pole,trying to make the rotor end with the armature winding of the stator,is a braking torque.The process is similar to dc motor braking energy,against falling so as to realize the speed (brake torque can be adjusted through the resistor the slide speed controllable).

Interaction between permanent magnet and closure of the armature winding,this generates parking autistic non-contact two-way protection,greatly increase the safety and reliability of the elevator,especially reduced all kinds of high-speed elevator safety clamp cheese block caused by high temperature damage in high speed motion security risks.generator stator Because the gearless traction machine of coaxial traction wheel and motor,traction wheel and brake wheel parts,usually as a result,by

adopting the technology of gearless permanent magnet synchronous motor,don't set up overspeed

protection system,in the elevator in the acceptance inspection,of course,also can make the request.In

addition,the synchronous motor can be done by the armature winding for dc load zero speed parking,in order to be truly need not brake of mechanical braking,parking realizes the electrical zero speed.Can help to prevent slide due to brake failure of failure,to three phase induction motor further improve the reliability of the system.