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1. (WO2017033030) BRAKING SYSTEM

Pub. No.:    WO/2017/033030    International Application No.:    PCT/GB2016/052673
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat Aug 27 01:59:59 CEST 2016
IPC: G01B 21/04
F16D 65/14
Applicants: RENISHAW PLC
Inventors: WOOLDRIDGE, Michael John
COLEBROOKE, Jack
CULLIVAN, Kevin
Title: BRAKING SYSTEM
Abstract:
An electro-magnetic brake which is switched between an operative braking position and an inoperative position by transient pulses of current. It is held passively in the operative and inoperative positions with little or no current. This prevents the generation of heat, which would affect the accuracy of measurements where the brake is used in dimensional measuring equipment. In one form, permanent and semi-permanent magnets (54,56) are arranged in parallel,and the magnetic polarity of the arrangement is flipped by transient current pulses in a surrounding coil (58). A capacitor may provide a reservoir of current to activate the brake in the event of a power supply failure.