Motorfel

Motorfel is a term used to refer to the magnetic field within an electric motor. This magnetic field is produced by the motor’s stator windings and, in some designs, by permanent magnets. It interacts with the rotor to generate mechanical torque. The field’s strength (flux) and its orientation relative to the rotor determine motor performance, including torque capability, speed range, and efficiency.

In DC machines, the motor field can be wound and excited separately (shunt, series, or compound configurations) or be permanent-magnet in some designs. In AC machines, the rotating magnetic field is created by the three-phase stator windings; the rotor is typically of induction type or contains permanent magnets. The interplay of the stator-produced field and the rotor flux governs torque according to motor equations, such as T = k_t φ I, where φ is the flux and I is the current.

Control and applications: Field strength can be adjusted to regulate speed and torque. Field weakening is a common strategy to extend the high-speed range of a machine. Modern drive systems often employ field-oriented control (FOC) or vector control to decouple torque and flux, allowing smooth, efficient torque production across a wide operating range.

Terminology notes: In English-language literature, the concepts are more commonly described as the motor’s magnetic field or the stator field. The term “motorfel” is uncommon in standard references and may appear in translations from Dutch or German sources. The article uses it here to denote the same underlying concept. See also magnetic field, stator, rotor, and torque.