Encoder specialist IVO's new MAGTIVO multiturn encoder has been designed for use under heavy-duty industrial conditions. The magnetic scanning method is robust, allows complete sealing of the encoder and tolerates heavy shaft loading.
Optical encoders cover most industrial applications, but fail in extreme conditions or under heavy mechanical strain. Manufacturers have tried to ruggedise them with sealed bearings and sophisticated covers but it is difficult to protect optical encoders from strong vibrations, corrosive sea air on oil platforms or cleaning fluids used in food processing plants. Optical systems generally require a clearance of 0,2 mm between optics and code disc, so a heavy mechanical strain on the shaft may cause the glass disc to rub against the optics or even fracture.
The new MAGTIVO uses a Hall sensor to pick up a signal from a magnet on the rotating shaft. The signal, which varies according to the angular position, is very stable regarding magnetic interference and temperature changes. Eventual interferences caused by static or dynamic external magnetic fields have the same effect on all original signals and are compensated by the software. The procedure achieves an absolute accuracy of approximately 0,5°. The single turn resolution is 10 bits (1024 steps/rev). Two additional receivers count the number of turns up to a maximum of 65 536 revolutions.
The unit can be completely sealed from the environment, so it meets the standards of protection class IP67 and its low operating power allows it to be used in explosive environments. The technology permits a smaller package; the standard 58 mm encoder is 12 mm shorter than its optical cousin. IVO will soon launch another model with a case diameter of 42 mm.
Extreme shaft loading is also much less likely to cause a problem, because the distance between the magnet and the Hall sensor is 2 mm which allows much higher tolerances on shaft and bearings. The encoder measures up to 6000 rpm. IVO's distributor is Johannesburg-based Timecount.
For more information contact: Jos Laurencik, Timecount, tel: 011 882 3105, e-mail: timecount@icon.co.za
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