Direct, wear-free motion monitoring and control
Controlling linear motion is the most common application amongst all encoder types. Whether the need is to regulate the speed of motion, control final positioning or provide soft limits for the linear motion, an encoder is the perfect solution. To determine the type of encoder needed, a few questions need to be addressed:
Incremental or absolute? Do you need to know the position of the axis immediately after power-on? Then an absolute encoder is required. If the efficiency of the machine is not compromised, and it is technically possible, it may be an option to perform a homing routine after power-on, in which case an incremental encoder can be used.
Rotary or linear encoder? Once you have decided on absolute or incremental feedback, either a rotary or linear encoder must be selected. The rotary encoder will almost always have the lowest component cost. However, if there is the potential for slippage or backlash in the mechanical coupling which will affect the accuracy of feedback, then a linear encoder should be considered. By directly monitoring the movement of the axis, rather than through mechanical transmission components, a stiffer control system results and concerns regarding slippage or backlash are eliminated.
Magnetic or Optical? So you've decided to use a linear encoder. Should you use an optical or a magnetic type? The traditional linear encoder uses a glass scale with optical scanning to provide the encoder data, offering extremely high resolution and accuracy.
However, as magnetic technology has developed, the resolution and accuracies achieved rival optical encoders in many applications.
Magnetic encoders provide robustness, tolerance to contamination and lower cost, amongst many benefits. True, extremely high magnetic fields can be an issue, but modern magnetic linear encoders frequently exceed expectations and they are often fitted to linear motors to provide speed regulation and positioning information. You will rarely find a more powerful source of magnetic interference than a linear motor.
From microns to miles: Different linear encoding solutions are needed for different applications. For example a materials handling application with the requirement to position over hundreds of metres and a machine tool application requiring shorter range and micron resolution.
The SICK range of non-contact magnetic absolute linear encoders has been developed to meet these diverse requirements.
The KH53 is a non-contact magnetic absolute linear encoder capable of providing sub millimetre resolution over distances from a few metres to one mile. Perfect for use in harsh environments or outdoors the KH53 continues to offer faultless reliable positioning even when covered with dirt or in rain or snow storms.
The TTK70 non-contact magnetic absolute linear encoder provides micron resolution over distances up to 4m. Perfect for medium performance linear motion tasks in machine tools, linear slides and converting machines, the TTK70 offers a cost effective, reliable measuring solution which can be splashed with machine tool coolant or paper dust from a converting machine.
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