Operation of asynchronous engine in escalators moving down 4

[Sempronio1960]

I am interesting about operation of asynchronous engine in escalators moving down. Is the engine working as generator? If so, can an overload beyond maximum couple cause an escalator overspeed? Moreover, in generator operation, is the energy lead into grid or dissipated in a rhesostat? Thank for attention

 

[Compositepro]

This video and The Wikipedia article on escalators says the handrail moves at the same speed as the steps. I can see some maintenance and adjustment factors that might cause it to be otherwise, however.

https://www.youtube.com/watch?v=mV2pTMITkkc

 

[itsmoked]

Muthu; just teasing you. You happen to have found a couple that are well maintained as there are certainly lots that don't move at the same speed. Typically the ones I ride aren't greatly out of sync as for instance you wouldn't have to re-set your hand before you were exiting but you'd certainly notice.

This is a typical handrail pulley:

You can see the rubber part that directly moves the handrail. As it wears there is a guaranteed ratio change. If they are kept up you won't notice, if they aren't there will be a difference.

Keith Cress
kcress -

http://www.flaminsystems.com