Glossary · Automation fundamentals, platforms and components
Stator
German: Stator
In electrical machines, the stator is the stationary part, usually a laminated iron core with windings (or, in some machines, permanent magnets), that produces or carries the magnetic field acting on the rotor.
- Automation components
In one sentence
The stator is the stationary part of an electric motor or generator, usually a laminated core with windings that creates the rotating field.
Example
Insulation resistance of the stator winding is measured during maintenance to detect moisture or insulation damage early.
How it applies
- Engineering: In three-phase motors, the stator windings create a rotating magnetic field. Winding temperature is often monitored with thermistors or temperature sensors, since insulation ageing depends strongly on temperature.
- Maintenance: Insulation resistance tests and winding temperature trends help to detect deterioration before failure.
- Safety: Stator terminals can carry dangerous voltage, including induced voltage when a permanent-magnet Rotor is turned by the load with the drive switched off. Include this in the Electrical hazard instructions.
- Documentation: Connection diagrams (star or delta) for the stator winding belong in the installation instructions and on the motor's terminal box cover.
Stator vs. rotor
The stator stands still and is usually where the electrical supply is connected; the Rotor turns inside it.