trefasmotor

A trefasmotor, also known as a three-phase induction motor or asynchronous motor, is an electric motor commonly used in industrial and commercial applications. It operates on the principle of electromagnetic induction, converting three-phase alternating current (AC) into mechanical energy. The term "trefas" is Dutch for "three-phase," reflecting its reliance on a three-phase power supply.

The basic structure of a trefasmotor includes a stationary stator and a rotating rotor. The stator consists of windings arranged in three groups, each displaced by 120 electrical degrees, creating a rotating magnetic field when powered by three-phase current. The rotor, typically a squirrel-cage or wound rotor, experiences induced currents due to this rotating field, generating torque and causing rotation.

Trefasmotoren are favored for their simplicity, reliability, and efficiency. They require minimal maintenance compared to other motor types and are well-suited for high-power applications, such as pumps, compressors, and conveyor systems. Their design allows for smooth operation over a wide range of speeds, though they typically run slightly below synchronous speed due to slip—a difference between the rotor’s speed and the magnetic field’s speed.

Variations include wound-rotor motors, which offer adjustable speed through external resistance, and double-cage rotors, which improve starting performance. Trefasmotoren are widely used globally due to their compatibility with three-phase power grids, which are standard in many industrial settings. Their efficiency and robustness make them a cornerstone of modern electrical engineering.