Transportation apparatus having deceleration controlled braking

Details Transportation apparatus having deceleration controlled braking Transportation apparatus having deceleration controlled braking

B - Operations, Transporting

66

B

198/3

B66B 23/00 (2006.01) B66B 1/32 (2006.01) B66B 25/00 (2006.01) H02P 3/04 (2006.01)

Patent

CA 1218953

26 ABSTRACT OF THE DISCLOSURE Transportation apparatus, such as escalators and moving walks, having controlled stopping characteristics. Deceleration is directly regulated via a deceleration servo loop which provides a current reference signal for an inner current loop. Brake current limiting prior to the con- trolled stop, as well as mechanically limiting the maximum brake gap, results in faster transient response, and a more linear braking torque versus brake current characteristics. Multiple drive units operate from a common deceleration reference signal, while having independent servo loops each operating from a "local" deceleration signal.

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