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Sensor Technology has revealed how its Torqsense non-contact wireless torque sensors based on surface acoustic wave technology are being used by Oxford YASA Motors in a test rig to help it further enhance its prototype motor designs.

Oxford YASA Motors is developing an axial flux motor that features yokeless and segmented armature (YASA) topology; one 500Nm motor has already been developed for use in electric and hybrid vehicles.

A model RWT321 Torqsense sensor from Sensor Technology was chosen for use in the company’s test rig.

Benefits of product application

  • The assembly required no wired connections; Torqsense sensors can be used on rotating shafts without the need for brushes and slip rings.
  • RWT321 sensor offers high accuracy and resolution, large overload capacity and can operate equally well with clockwise and anti-clockwise rotation.
  • The sensor provides torque data and information on shaft speed, power and temperature in real time.
  • The RWT321 features a CANopen interface, which is compatible with Oxford YASA Motors’ DAQ and analysis systems.
  • Oxford YASA Motors found Torqsense easy to install and set up.

Sensor Technology

Sensor Technology are manufacturers of TORQSENSE Transducers, the world’s first low cost non-contact rotary torque transducers designed for OEM applications. Rotary torque measurement has always been difficult and expensive.

The patented method uses a surface acoustic wave device as a frequency dependent strain gauge and measures the change in resonant frequency caused by the applied strain in the shaft.

The signal is transmitted via an RF couple from the rotating shaft to a fixed pick-up.

By using a frequency-based device, the signal bandwidth is increased, and the problem of electronic interference common with analogue signals is eliminated. The torque sensors are designed to operate direct from a PLC or a PC.

They require minimum length of shaft, have low inertia, no physical contact between shaft and housing, wide bandwidth, high resolution and accuracy resolution to better than one part in a million, and excellent noise immunity.

The technology lends itself to design of OEM transducers for specific customer applications. Applications include automotive, manufacturing machines, condition monitoring where knowledge of torque is critical, torque control of tightening procedures, and monitoring of viscosity during mixing where consistency is required. The technology replaces existing types of rotary torque sensors by providing better performance at a lower price.

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