B - Operations – Transporting – 66 – B
Patent
B - Operations, Transporting
66
B
198/3, 341/48
B66B 25/00 (2006.01) F16D 55/00 (2006.01) F16D 65/14 (2006.01) H02P 3/04 (2006.01)
Patent
CA 1303188
22 53,828 ABSTRACT OF THE DISCLOSURE Transportation apparatus, such as escalators and moving walks, having an electrically released, magnetically set brake, and a servo loop for regulating the brake coil current. Brake voltage and brake current feedback are both used in the regulation of the brake current, with the values of the voltage and current feedback being selected to cause electromagnetic flux produced by the brake coil current to substantially cancel the magnetic flux produced by permanent magnets over the operating temperature range of the brake. In a preferred embodiment of the invention, the brake current is pulsed continuously while the trans- portation apparatus is operated, to prevent transient excursions of the brake current from initiating and main- taining partial setting of the brake.
566184
Ag Inventio
Riches Mckenzie & Herbert Llp
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