Air-Gap Sensors Bask In High Magnetic Fields

Sensonics’ CS air-gap sensors are tailored for use in high magnetic field applications. They are designed for use on hydro turbine generators and large electric motors. The sensors provide a rotor to stator air gap measurement that can be used to monitor both the eccentricity of the rotor relative to the stator and individual pole to stator air gaps.


The CS sensors are non-contact dynamic position transducers employing a capacitive technique to provide an accurate displacement measurement from the sensor face to a metal target.  The advantage of the capacitive technique in generator applications is the high immunity to magnetic fields. The CS series also provides high resolution and relative insensitivity to different (metal) target materials.  

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The CS sensor is designed in a robust stripline mechanical arrangement for mounting on the stator wall. It features separate transmit and receive coaxial cables routed over the stator wall or through ventilation holes to the driver that provides the transmission signal for the stripline and receiver detection. 


Linearized opto-isolated outputs are provided in both voltage and current format which can be configured to represent various rotor pole measurements with respect to the stator. These include pole and rotor profile as well as an overall minimum gap output with sensor ranges of 25 mm, 50 mm, and 75 mm.  For more info, visit Sensonics and/or email [email protected].

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