Procedure and apparatus for braking a squirrel-cage elevator mot

Details Procedure and apparatus for braking a squirrel-cage elevator mot Procedure and apparatus for braking a squirrel-cage elevator mot

1991-03-07

1994-01-11

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Braking

318807, 187119, 187114, H02P 318, H02P 528, B66B 130

Patent

active

052784843

ABSTRACT:
A procedure and apparatus are provided for braking a squirrelcage 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 to 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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