Electric drive is the system capable of converting electrical energy into mechanical energy (movement), keeping this conversion process under control. It is used to access machines or equipment that require some type of controlled movement, such as the speed of rotation of a pump. The most widely used motors in the drives are single-phase and three-phase induction motors. Nowadays, the development of alternating current motor drive techniques and economic viability have favored the replacement of DC motors with induction motors driven by frequency inverters. In addition, due to its features and advantages, the DC motor is still the best option for applications in large and heavy machinery. 112-3-100

A modern electric drive normally consists of the combination of elements: Motor that converts electrical energy into mechanical; Electronic device that controls and / or controls electrical power; Mechanical transmission that adapts the speed and inertia between engine and load.

The choice of the engine and its stop and start devices, even if influenced by environmental aspects, is directly related to the mechanical load to be applied and to its impact on the electrical system. Resistant and dragging conjugates need to be analyzed to avoid operational problems such as wear, vibration, heating, etc.