Control of synchronous motors

Precise rotor angles as the basis for field-oriented control

Maximum precision for maximum performance: Highly accurate, stable rotor angle signals provide the ideal foundation for powerful, low-vibration FOC control
Speed that enables dynamics: Ultra-fast, low-latency signal processing ensures immediate response to every load change and guarantees confident motor behavior
Reliability under harshest conditions: Robust against heat, magnetic fields, and mechanical tolerances, for consistently safe motor control directly in demanding machine environments

Why the exact rotor angle is critical in PMSM drives

For field-oriented control (FOC) of permanent magnet synchronous motors, precise rotor position is the central control signal. Only when the motor controller knows the exact angle can it optimally align the current vector, enabling maximum torque, highest efficiency, and smooth, low-vibration motion.

Even small angular errors lead to power losses, increased current consumption, and unstable control behavior. Especially in dynamic applications, fast, low-latency angle measurement ensures that the motor responds immediately to load changes and delivers its full performance.

Our advanced motor feedback sensors and bearingless rotary encoders provide highly precise, robust, and temperature-stable signals for this purpose – directly in demanding motor environments.

Rotor position encoders for every motor environment

Thanks to their exceptionally flat design and flexibly adaptable geometry, our compact inductive rotor position encoders offer a high degree of design freedom. Whether for shaft-end mounting or as a through-hollow-shaft version – we provide solutions that integrate optimally into a wide variety of drive concepts. Using modern rapid prototyping methods, you receive custom prototype units within a short time, precisely tailored to your requirements.

Precise rotor angles for maximum performance

In motorsport, rotor position encoders are used in electric motors to deliver precise real-time rotor position data. This enables the control system to optimally regulate electric torque – both during acceleration and energy recovery.

The sensors are highly integrated and can be fitted even in very confined installation spaces. Despite extreme temperatures, vibrations, and rapid load changes, they operate reliably and ensure consistent performance of the electric drive.

Inductive rotor position encoders as a resolver alternative in synchronous motors

Inductive rotor position encoders offer a robust, maintenance-free alternative to the resolver. They are more compact, more cost-efficient, and immune to vibration, temperature, and EMI interference.

Their precise, low-latency angle measurement enables efficient FOC control, making them ideally suited for modern synchronous motors and integrated drive systems.

Rotor position encoders for synchronous motors

GEL SEK10 Inductive rotor position encoder

GEL SEK11 Compact inductive rotor position encoder