What type of Information are you looking for? Typically on the old Cranes the hoist drive was either a wound rotor motor (AC) with a drum or rheostat controller or a DC Motor and Controller that had either a step type series controller or a drum controller with stages of grids. The newer ones typically have some type of Electronics control (Tube type or solid state) interfaced either in a DC controller or the rotor circuit of a wound rotor motor.
I have been retired for about 6 years so I have purged many of my prints but I may be able to find some information if I knew specifically what you are looking for. If you can specify what type of system you have and if dynamic and/or regenerative braking is involved I will look through my old information and see if I can find something that might be of help to you. In your application do you also use bridge and carriage drives?
If you have multiple drives do they all use the same technology?
Tom R.
