The three-phase motors seen from within the engineering aspect are the ones that are most relevant because they are the most active in power applications. This class of motors are divided into synchronous motors, which have rigidly constant rotation and asynchronous motors, that the rotation is a function of mechanical load (resistant aggregate) to which it is employed. Synchronous motors, due to their particular characteristics, require special best prices for rab here care in operation (at higher powers, they must leave without mechanical load), have a construction with more complexity and have restricted application area.
Asynchronous motors also called induction motors are the most widespread and used in the engineering industry due to its ease of operation, versatility and cost. The effective property of such engines is that they have variable speed, depending on the mechanical load value that is requested. Single-phase asynchronous motors are normally used when a power of up to 5HP is required, with three-phase motors being used for higher powers, although there are also three-phase motors of the latter model, with powers lower than 5HP.