B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
B66B 1/30 (2006.01) B66B 1/28 (2006.01) B66B 5/02 (2006.01)
Patent
CA 2265327
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.
Piserchia Gerard G. Jr.
Ramos Julio C.
Ag Inventio
Riches Mckenzie & Herbert Llp
LandOfFree
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