Capacitive Encoder

Netzer Precision Motion Sensors has taken a revolutionary position sensing technology, originally developed for harsh environment specialized applications, and made it available for today’s broader range of defense, homeland security, aerospace and instrumentation motion control requirements. Standard and customized rotary and linear electric encoders are also applicable to medical, automotive and a wide range of other applications.

The Electric Encoder™ non-contact technology relies on interaction between the measured displacement and a space/time modulated electric field. It offers a blend of features unequalled by optical or magnetic encoders.

Do you have technical questions or need a quote?

Contact us today to talk to an experienced MACCON engineer!

Open Contact-Form

Advantages of Capacitive encoder

The main technical and economic benefits of the electric / capacitive encoder technology can be summarized as follows:

  • No glass disc, no LED light source, so that eliminates possible points of failure
  • Generous mounting tolerances
  • Very low weight, inertia, and profile (=<10mm)
  • Ring shaped, hollow shaft with a wide range of diameters
  • Absolute position output over 360° rotation range
  • Precision to 0.001° in selected models
  • Default operation range from -40°C to +85°C
  • Dual and triple redundancy options
  • No magnetic signature
  • High tolerance to condensation and contaminants
  • Insensitivity to EMI/RFI and magnetic fields
  • High customizability
  • Low power consumption
  • Ultra-high-speed options
  • Wide variety of position feedback protocols

Do you have technical questions or need a quote?

Contact us today to talk to an experienced MACCON engineer!

Open Contact-Form

Application scenarios for capacitive encoders

Typical reasons for using capacitive encoders:

  •     the environment is heavily affected by electromagnetic interference
  •     an extremely short axial overall length is required
  •     a large internal bore in combination with short axial length is required
  •     Robustness against dust, humidity, shock and vibration is required

Our capacitive encoder uses the capacitive measuring principle and is therefore immune to EMC interference. EMC disturbances can occur in the vicinity of power electronics or in certain medical applications such as MRI (magnetic resonance imaging) technology. Due to the holographic measuring principle, which derives the signal over the full effective area of the encoder disc, the accuracy is less sensitive to mounting tolerances than with optical angle measurement systems. The capacitive encoder has no glass disc and no light source / light receiver and is therefore insensitive to dust, humidity, shock and vibration.

Capacitive encoder in kit form for robotics

The VLX-60 is a member of the VLX series of capactive encoders, which are kit encoders (rotor+stator, no housing) especially designed for robotics.

The main features are:

  • Absolute position
  • Short axial length (<10 mm)
  • Large throughbore (especially useful for cables which must pass through robotic joints).
  • No bearings
  • High accuracy
  • Hardened against temperature, shock, moisture
  • Hardened against EMI/EMC and magnetic fields
  • 18-bit resolution
  • Accuracy 0.02°

The encoder works by measuring capacitance over the full area of the encoder disc, thus, the mechanical mounting tolerances of the encoder are very flexible. At the same time, the encoder delivers very high accuracy. As the encoder has no ball bearings, glass code disks, LED light sources and other parts subject to wear-and-tear, it is a very reliable device. In addition, the power consumption is very low. The encoder is single-turn and provides SSI or BiSS-C absolute feedback.

There are two models available.

  • VLX-60 with 60mm outside diameter and 25mm throughbore.
  • VLX-64 with 64mm outside diameter and 34mm throughbore.

Please download one of the datasheets on the right-hand side for more information. Alternatively, feel free to contact us, to talk to an experienced engineer about your application.