Because of their higher efficiency, smaller size and greater reliability, AC motors are gradually overtaking conventional DC (Direct Current) motors as the preferred power source for electric fork trucks.

In both DC or AC systems, a controller is used to manage the voltage and current supplied to the motor. The main difference is that an AC controller will first transform the energy from the battery (which is DC) into AC.

Unlike DC motors, the AC motor does not need brushes and neither a commutator in order to rotate. Instead, it uses an induced magnetic field, thereby eliminating these friction between components.

AC motors also generate more torque than their DC equivalents, even when the RPM is increasing.

Other features:

• No contactors for directional switching and regeneration
• A simpler motor structure
• Greater reliability
• Less friction for cooler running
• Reduced maintenance