Speed monitoring takes a step forward
A
Rowe Hankins Components product story
Edited by the Engineeringtalk editorial team
Apr 27, 2005
Following extensive research and development work, rail systems engineering specialist, Rowe Hankins Components, has refined and launched its next generation of speed monitoring devices.
Following extensive research and development work, rail systems engineering specialist, Rowe Hankins Components, has refined and launched its next generation of speed monitoring devices.
To coincide with the launch, its speed probes will now be rebranded I-Mag and pulse generators will be rebranded Mag-T.
Worldwide, the company has installed over 12,000 Hall-effect speed monitoring devices, as either original equipment or retro-fitted to trains or light rapid-transit vehicles.
Accurate speed monitoring is vital for an efficient, reliable and safe rail system.
Monitoring speed at each axle set on rolling stock provides data for better synchronisation and so gives a more effective use of power.
This improves acceleration and deceleration while reducing wheel slip and damage to wheel sets and track.
Rowe Hankins has invested heavily in research to make the latest generation of devices even more reliable.
Its engineers have addressed issues of lateral misalignment and variable gap between the sensor and the target.
This was sometimes a problem when sensors were retrofitted to gearboxes, and inconsistencies in case construction meant sensors could not be consistently placed close to the target gearwheel.
The new I-Mag sensors can be installed with a gap of up to 4mm between sensor and target and still provide a positive and reliable impulse.
Other improvements in the range include standardisation of mechanical components and electronic systems.
This will reduce the spares inventory and provide greater interchangeability of components between different programmes.
Measures to give more impulses per cycle have also been introduced on Mag-T pulse generators.
These can now give up to 112 pulses per rotation giving much greater positional accuracy.
The first practical application of this will be in platform positioning systems on London Underground.
Hall-effect technology has proven lower in cost and higher in reliability than traditional optical devices used for speed monitoring.
Being driven by magnetic impulses, I-Mag and Mag-T Hall-effect devices are extremely tolerant of grease, dust and vibration.
Reliability of Rowe Hankins speed probes has been certified by one programme operator as better than 10million hours mean time between failures (MTBF).
Advice on implementing I-Mag and Mag-T Hall-effect devices is available from Rowe Hankins.
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