MODULAR ARRANGEMENT OF A DOUBLE WRAP TRACTION ELEVATOR MACHINE WITH DYNAMIC BRAKING

摘要

A drive system for a gearless elevator in which the first sheave and the second sheave both have drive motors driving a set of ropes in a double wrap traction arrangement driven by both motors to raise and lower the elevator car. The drive system further includes a dynamic braking system having a matrix switching unit for connecting and disconnecting the drive motors from a source of drive power to a resistive bank for receiving electrical energy from the drive motors during dynamic braking.