초록 ▼

Magnetizing current generated in a linear induction motor driving elevator car doors in elevator systems is optimized. Magnetizing current level is set low for door operation modes requiring lower levels of thrust, such as hold open and hold closed. Magnetizing current level is increased for modes o

Magnetizing current generated in a linear induction motor driving elevator car doors in elevator systems is optimized. Magnetizing current level is set low for door operation modes requiring lower levels of thrust, such as hold open and hold closed. Magnetizing current level is increased for modes of door operation requiring greater thrust levels, such as closing or opening. Optimization of magnetizing current in linear induction motors reduces overheating and increases energy efficiency.

대표청구항 ▼

[ We claim:] [1.] A system for controlling an elevator car door, comprising:a door having an opened position and a closed position, an opening mode and a closing mode;a linear motor coupled to said door for moving said door into said opened position and said closed position; anda controller connecte

[ We claim:] [1.] A system for controlling an elevator car door, comprising:a door having an opened position and a closed position, an opening mode and a closing mode;a linear motor coupled to said door for moving said door into said opened position and said closed position; anda controller connected to said linear motor for controlling a magnetizing current to said motor, said controller including software for varying the magnetizing current to a low value when said door is in said opened or said closed position and said controller includes software for varying the magnetizing current to a high value when said door is in said opening mode and to a medium value when said door is in said closing mode.