Emergency braking system for a squirrel-cage elevator motor

Details Emergency braking system for a squirrel-cage elevator motor Emergency braking system for a squirrel-cage elevator motor

B - Operations, Transporting

66

B

364/31

B66B 5/02 (2006.01) B66B 1/30 (2006.01) H02P 3/24 (2006.01)

Patent

CA 2037558

ABSTRACT A procedure and apparatus are provided for braking a squirrel- cage elevator motor fed by a frequency convertor in fault situations using a direct current supplied from a d.c. voltage source. In the procedure of the invention, the current in at least one of the motor phases and the rotational speed of the motor are measured. When the elevator speed exceeds the value corresponding the nominal slip and the motor current is less than the nominal magnetizing current, a switching device is caused to connect a direct current from a d.c. voltage source to the motor, thereby providing a magnetizing current and allowing the motor to act as an eddy current brake.

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