Commands and Control

Most electrical machines found, except for some category, such as single-phase motors such as shaded pole and repulsion, for example, have the possibility of being used in both directions of rotation, varying only from a control considered adequate . Thus, the main functions performed by the control of an electric motor consist of starting, stopping, direction of rotation, speed regulation, limiting of starting current, mechanical protection and electrical protection, among others. An engine can only start its spin at the instant at which the moment of load to be overcome, when stopped, is less than its starting torque.

Therefore, in the case of some specific applications there is a need for a rapid deceleration of the motor as well as of the load. When the power line motor is switched off, it is important that a rotating reversing member is used while the motor is still running. The shutdown or shutdown of the mains motor is effected through a relay, preventing it from starting in the opposite direction. In the case of synchronous motors dynamic braking can be employed.