Electric motors are divided first by supply type into AC (alternating current) and DC (direct current) motors; AC motors are further classified as synchronous or asynchronous, depending on how the rotor follows the rotating field. The most common type in industry is the three-phase asynchronous motor, thanks to its robust construction and economical operation.

AC motors

AC motors are durable, long-lasting and low-maintenance, and are widely used in pumps, fans and general industrial applications. There are two main sub-groups:

  • Asynchronous (induction) motors: the rotor turns slightly slower than the stator's rotating field; this difference is called slip. The squirrel-cage rotor has no brushes, so maintenance needs are low. Single-phase and three-phase versions exist.
  • Synchronous motors: the rotor turns at exactly the speed of the rotating field, so speed depends on frequency rather than load. Permanent-magnet synchronous motors and synchronous reluctance motors offer high efficiency, and IE4 and IE5 levels are reached with these technologies. They are usually operated with a frequency inverter.

DC motors

DC motors are preferred where precise speed and torque control is required. Conventional brushed DC motors are simple to control but need regular maintenance because of brush and commutator wear. Brushless DC (BLDC) motors eliminate this with electronic commutation and are common in fans, small pumps and portable devices. In industry, many older DC drives are now being replaced by inverter-fed induction motors.

Other special types

Servo and stepper motors for positioning, vibration motors for screens and feeders, and smoke extraction motors for fire safety serve specific needs. The DRG Motor range mainly consists of high-efficiency three-phase asynchronous motors.

To determine the right motor type for your application, contact us on +90 (542) 666 11 11 (WhatsApp) or at info@drgmotor.com.