| 摘要 |
Operational control system for lift and elevator machinery adapted for electrodynamic braking, said operational control system being adapted to be connected to the machinery of existing lift or elevator equipment. The operational control system is designed for one-speed A.C. synchronous motors of the short-circuit type forming part of operational control units provided with a simple mechanical brake. The operational control system improves the stop-plane exactitude and reduces brake wear. In the operational control system electrodynamic and mechanical braking is combined, the control being performed via a reference voltage formed from an output signal received from a speed-sensing member. |
