Precision movement systems handle magnetic fields
An
Armstrong Optical product story
Edited by the Engineeringtalk editorial team
Dec 1, 2006
Demand for nonmagnetic movement systems has increased steadily over recent years with stages being used in life science applications, microelectronics and nanotechnology.
Demand for nonmagnetic movement systems has increased steadily over recent years with stages being used in life science applications, microelectronics and nanotechnology.
Multi-axis linear stages, combined linear and rotary motion, systems with six degrees of motion are all being commonly specified for increasingly complex uses.
To complement the standard range of linear and rotary precision movement systems provided by Feinmess Dresden, UK representative Armstrong Optical of Northampton has now added systems to allow operation in both extreme magnetic fields and ultra-high vacuum down to less than 0.1uTorr.
Many of the problems of operating in extreme magnetic fields are associated with the materials used to construct the movement system.
Magnetic properties represent an additional specification besides those that are already necessary in standard motion systems.
For many applications steel can be considered, but even stainless steel, which is normally seen as "nonmagnetic", may have still enough remaining magnetism to cause trouble in certain applications.
In these instances titanium, other alloys and ceramics are used to provide optimum performance characteristics.
Alongside material selection, designers also have to deal with possible interference from the external magnetic fields of motors, encoders and other electronic systems used to drive and control the stage.
Stages to be used in weak magnetic fields can normally use stainless steel components.
For those applications where steel components cannot be used the motors are usually placed outside the direct magnetic field or piezoceramic drives are considered.
In order to provide overall control of the motion system optical linear encoders are the only option for position feedback.
Limit switches must be based on optical signals since Hall effect sensors are not usable.
There is also the possibility that strong magnetic fields will cause electronic circuitry to fail or malfunction.
Even with all the difficulties associated with high vacuum and extreme magnetic flux Feinmess Dresden has production proven expertise in supplying precision motion systems with demanding specifications in hostile environments that can be custom tailored to meet the most stringent requirements.
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