Julio Cesar Ramos

US Patent:

57171742, Feb 10, 1998

Filed:

May 8, 1996

Appl. No.:

8/643460

Inventors:

Julio C. Ramos - Lake Hiawatha NJ

Assignee:

Inventio AG - Hergiswil NW

International Classification:

B66B 132
B66B 134

US Classification:

187288

Abstract:

An apparatus and a method for controlling an elevator brake assembly (1) includes a control circuit (CM) for selectively connecting an electrical power supply (28) to a brake armature coil (9) to move an armature plate (4) between a brake actuated rest position against a brake friction lining (5) and a brake released hold position adjacent a brake housing (2). The control circuit (CM) applies a first voltage to the coil (9) to move the armature plate (4) against a force applied by a spring (3) from the rest position to the hold position in response to a signal on a brake pick signal line (BP). The control circuit (CM) applies a second voltage to the coil (9) to control the movement of the armature plate (4) by the spring (3) from the hold position to the rest position in accordance with a predetermined velocity versus distance curve to achieve minimum impact on the lining (5) at the rest position. A position sensor (11,12) is moved by the armature plate (4) to generate an actual position signal for adjusting the second voltage and a microswitch (10) is actuated by the armature plate (4) to signal the hold position. The control circuit (CM) self-calibrates by minimizing the position signal at the rest position and adjusting the velocity versus distance curve based upon the position signal at the hold position.

US Patent:

59693037, Oct 19, 1999

Filed:

Mar 17, 1998

Appl. No.:

9/041999

Inventors:

Gerard G. Piserchia - Emerson NJ
Julio C. Ramos - Lake Hiawatha NJ

Assignee:

Inventio AG - Hergiswil NW

International Classification:

B66B 128
H02P 312

US Classification:

187297

Abstract:

An emergency stop circuit for an elevator drive includes an emergency stop control (7) that selectively varies the current flowing in a field winding (4) of a direct current drive motor (M). During an emergency stop, the motor (M) operates as a generator and has an armature winding (1) loaded with a braking resistor (9) to apply a voltage, depending on the direction of movement of the elevator car, either by a first switch (10) and a second switch (11), or by a third switch (12) and a fourth switch (13). The switches (10, 11, 12, 13) are connected as an H-bridge between the windings (1, 4) and are controlled by the emergency stop control (7) depending on the deceleration required by the elevator car, for example by pulse operation depending based upon a preset deceleration value and a measured deceleration value from a deceleration sensor (14) mounted on the car.