Piher Sensing Systems

Inductive high-speed xEV rotor position sensors

Accurate feedback on the angular position, direction, and speed of the rotor shaft is essential to optimize control of the motor inverter and drive electric motors with the best possible efficiency. With lower weight, smaller dimensions, immunity to stray fields and comparably lower cost, Piher Sensing System’s eMotor Rotor Position Sensors offer a true alternative to conventional resolvers. Furthermore, inductive eMotor rotary position sensors can be designed to be ASIL-D compliant on sensor level.

Inductive sensors use the physical principle of induction in a wire loop and eddy currents to detect the position of a solid metallic target rotating above a set of coils. This allows a reduction in parts and higher design flexibility (e.g. through-shaft, end-of-shaft and arc configurations).


Functional safety on sensor level

Development according to functional safety ASIL-D on sensor level possible.

Immune to magnetic stray fields

No shielding required as inductive technology is not affected by electromagnetic stray fields.

True Power-on Sensor
Delivers accurate motor position directly on start-up.
No additional electronics needed

A direct, demodulated analog output means no additional electronics are needed to calculate rotor position.

Low weight and compact dimensions

Reduced size and weight compared to resolvers.

Made for harsh environments
The rugged package protects the sensor from dust, moisture, vibration and extreme temperatures for usage in the most demanding environments. 

Integration options

Why inductive motor control?

Working principle

Inductive position sensors use the physical principles of induction in a wire loop and eddy currents to detect the position of a conductive metallic target that is rotating above a set of printed copper coils consisting of one transmitter coil and two receiver coils. The possibility to perfectly customize the sensor to the motor dimensions enables more flexibility in the development of the electric / hybrid powertrain of the future.

Cost efficiency

Compared to conventional resolvers material costs can be significantly reduced as neither magnets, nor extensive copper windings or external components are needed and the overall number of parts is lower. Furthermore, the high robustness to misalignments and tilt enable further cost savings at the assembly line.

Design flexibility

Completely adapted designs in through-shaft, on-shaft or arc configuration can be provided by Piher Sensing Systems and are together with low weight and compact dimensions a further argument that speaks in favor of inductive technology. Support for safety-critical applications up to ASIL-D on sensor level can be reached through integration of an additional chip.