1. A139_e
Laser-optical displacement sensors
optoNCDT
Measurement of carbon brush wear on electric motors
To increase the service life of electric motors and at Ambient conditions
the same time to optimize the current feed to the - Temperature: Up to 30°C
commutator, the wear of carbon brushes and the - Medium: Air
service life is tested right at the development stage. - EMC: Electromagnetic interference due to brush
The measurement takes place at the end of the brush sparking
and acquires the up and down movements of the
brush which represent a decisive criterion at high Measurement system requirements
rotational speeds. Due to the non-contacting - Measurement range 10 mm
measurement principle there is no influence due to - Resolution 1 µm
mechanical probing. As a result the user obtains a - Bandwidth 5 kHz
true, undisturbed signal trace.
The wear measurement takes place on the test rig Reasons for the system selection
using laser triangulation sensors of the Series - Non-contact measurement
optoNCDT. - High precision measurement against black
The measurement system consists of two laser- surface
based optical displacement sensors which are - Small measurement spot
ideally suited to the measurement against dark and - Large base distance
also shiny surfaces. The carbon brush does not need - High measurement speed
to be modified for the measurement and coating of - No interference due to electromagnetic fields
the end of the brush to improve the reflective
properties is not necessary. Measurement setup optoNCDT
2x ILD1800-10 laser displacement measurement
optoNCDT system with RS485 interface
Motor
2x PC1800-3 supply/output cable
Brushes
optoNCDT
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Koenigbacher Str. 15 Tel.: 0 85 42/1 68-0 info@micro-epsilon.com Certified DIN EN ISO 9001 : 2000
94496 Ortenburg / Germany Fax: 0 85 42/1 68 90 www.micro-epsilon.com Modifications reserved Y9781139