A three-phase electric motor runs on the rotating magnetic field created by alternating current from three separate phases, and it is the most widely used motor type in industry. Because it delivers higher power, smoother torque and less vibration than single-phase motors, it forms the backbone of heavy industrial applications.

How a Three-Phase Motor Works

Three winding groups placed 120 degrees apart in the stator create a rotating magnetic field when fed with three-phase current. This field induces current in the rotor and drags it along; the slip between them lets the induction motor produce torque. No separate starting winding is needed.

Speed and Pole Count

On a 400 V / 50 Hz supply the synchronous speed depends on pole count: 2 poles 3000 rpm, 4 poles 1500 rpm, 6 poles 1000 rpm. High speed suits compressors and pumps, while low speed is preferred for high-torque conveyors and mixers.

Mounting Types and Protection

Depending on the machine, a B3 foot, B5 flange or B14 face frame is selected. IP55 protection guards against dust and moisture, while Class F insulation protects the winding under continuous S1 duty. A cast iron frame improves durability on lines with heavy vibration.

Choosing the Right Three-Phase Motor

When power, speed, mounting and efficiency class (IE3 Premium) are weighed together, the right motor becomes clear. As an İzmir-based supplier, DRG Motor offers three-phase motors from 0.55 to 355 kW; share your application to request a quote.