Posted to News on 25th May 2016, 15:53
Absolute encoder offers new options for controlling DC motors
An example of an innovative design philosophy applied to the control of DC motors with the emphasis on developing compact, flexible, energy-efficient products is being introduced by ROTALINK. Their Output Shaft Absolute Encoders provide accurate positional information to a resolution of +/- 0.35degrees with a performance which is unaffected by power loss and is self-correcting in the event of electrical interference.
These absolute encoders operate via contactless Hall effect technology which provides either a linear analogue output (0-5V) or reliable 10bit positional data sent via a SSI (Synchronous Serial Interface). However, when the digital option is chosen the benefits are longer life span, higher reliability and improved noise resistance.
The encoder is particularly effective when used in conjunction with Rotalink's 210 gearbox and 24mm brushed DC motor. The result is a compact and low-cost servo package measuring just 50mm × 50mm × 34mm, weighing 100g and offering important advantages over a hybrid stepper motor of equivalent size.
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The absolute encoders are available as single turn and multi-turn options. The single turn option operates through the full 360 degrees of rotation to accurately monitor its position indefinitely and without power. The multi-turn unit operates to a maximum of 32000 revolutions whilst sill providing the full resolution of 10 bits per 360 degrees and is fitted with an integral rechargeable battery to provide full position monitoring for up to 100 hours when mains power is removed.
Using an extended SSI interface with the multi-turn unit allows the end-user the option of programming of zero position and maximum rotation limits as well as resetting any error codes.
Typical applications for these Absolute Encoder/Gearbox/Motor packages include motorised valves, pan/tilt mechanisms and vending carousels Further details are available from www.rotalink.com.
