ARC Motor Rotor Position Sensor
Motor position sensors for accurate xEV motor commutation
Accurate feedback on the rotor shaft’s angular position, direction and speed is essential for optimizing motor inverter control and maximizing motor efficiency. Precise absolute rotor position information also enables accurate motor commutation, supporting smooth torque delivery and dynamic motor control across the full operating speed range.
With lower weight, smaller dimensions, immunity to stray fields, rare-earth-free construction and comparatively lower cost, inductive high-speed eRPS eMotor Rotor Position Sensors offer a compelling alternative to encoders and resolvers.
Based on the proven principles of electromagnetic induction and eddy-current sensing, the technology detects the position of a conductive rotor target without requiring magnets or mechanical contact. This enables reliable operation at very high rotational speeds, excellent resistance to electromagnetic interference, and consistent performance despite air-gap variations, misalignment, vibration, and demanding environmental conditions.
The ability to customize the sensor to specific motor dimensions provides greater flexibility in the development of next-generation electric and hybrid powertrains. Its advanced non-contact sensing principle ensures precise output, while its rugged construction is designed for the toughest environments.
Specifications
- Up to 600 000 (electrical) rpm speed
- Low weight and compact dimensions
- Robust to tilt, misalignment and air gap variations
- True power-on sensor: excellent accuracy and precision
- No calibration, reference turn or homing required
- Immune to stray fields, no shielding required
- ASIL-D ready
- Suitable for harsh environments (fully sealed, shock, vibration)
- ESD and short-circuit protection
Integration options
- On-shaft
- Through-shaft
- Arc/Segmented off-axis
KEY FEATURES
Removing magnets reduces exposure to rare-earth supply risk, avoids magnetic particle build-up, and improves immunity to stray fields and EMI.
Development according to functional safety ASIL-D on sensor level possible.
No shielding required, as inductive technology does not rely on magnets and is not affected by electromagnetic stray fields. Unlike magnetic-based solutions, performance is not dependent on keeping the sensor away from stray magnetic fields or nearby ferromagnetic materials.
A direct, demodulated analog differential output means no additional electronics are needed to calculate rotor position.
The rugged package protects the sensor from dust, moisture, vibration and extreme temperatures for usage in the most demanding environments.
Reduced size and weight compared to resolvers.
Delivers accurate absolute motor position directly on start-up, with no calibration, no reference turn and no homing routine required.
SPECIFICATIONS
| Signal output |
Analog: differential sine/cosine (1.0V to 4.0V) Digital: ABI, SPI, SENT, AB, PWM |
| Accuracy | ±0.3° el |
| Resolution |
Analog: infinite Digital: up to 14 bit |
| Propagation delay | <4.2 μsec |
| Power consumption | < 20 mA |
| Maximum speed | 600.000 rpm (electrical) |
| Pole pairs | Up to 32 |
Other specifications available.
| Mounting and dimensions |
Customizable to application architecture Arc, End-of-shaft, Through-shaft configurations |
| Target material | Conductive metal |
Other specifications available.
| Operating temperature | -40°C to +160°C |
| Sealing | IP69K, IP67 |
Other specifications available.
POTENTIAL APPLICATIONS
