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Pencil coils

Electricfil An LVDT (linear variable differential transformer) delivers a signal proportional to the linear position (displacement) of a magnet fi xed to a moving part.

A primary coil is energized to create a magnetic fi eld that is coupled into two secondary coils. The difference between the resulting voltages induced in the two secondary coils varies with the position of the magnet and provides the basic position signal. An ASIC is used to condition the signal. The complete sensor can be located outside the housing of the part in a less severe environment, providing non-contact measurement of displacement through metal walls, or the sensing component can be located inside the housing with the electronics outside.

Electricfil solution - ready technologies

Characteristics

  • Stroke up to 100 mm
  • Temperatures up to 180°C
  • Typical accuracy: ± 2%
  • Response time: 1 ms
  • Airgap up to 4.5 mm
  • Size: stroke length + 30 mm
  • Integrated diagnostics
  • Optional redundancy
  • Non-contact sensing
  • Through-wall detection for non-magnetic materials
  • Integrated or remote electronics
  • Low sensitivity to external magnetic fields
  • Interface: 3-wire, analog and PWM output

Electricfil knowhow

  • Integration in sensor clusters or mechatronic modules
  • Wide range of packages and interfaces
  • Fully programmable sensors
  • Proven core technology including ASIC
  • PWM or analog mode
  • Same sensor design for linear or angular measurements
  • Combination of several LVDT linear and/or angular sensors in a single module
  • Patented design

Application domains

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Engine management

Ignition applications
 

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