If the electric motor reaches a predetermined speed, the auxiliary winding shall automatically be disconnected from the mains by means of a specific type of switch, which is normally generated by a centrifugal force, which may also be called a centrifugal switch or other cases, by current relay, manual key or other specific devices. The motor, which has been determined as a split phase, has a main winding and an auxiliary starter, both of which are offset by 90 degrees. The auxiliary winding must allow the creation of a kind of phase shift, which will produce the necessary torque for the initial rotation to occur and then the acceleration.
Since the auxiliary winding is pre-dimensioned to act only at start-up, if it is not switched off then it may be damaged. The angle of lag that can be obtained between the main and auxiliary winding currents is reduced and therefore these motors 6015-2Z have starting torque equal to or greater than nominal, which may limit their application to fractional power and also , to loads that require less starting torque.
It can be stated that autotransformers are widely employed in electrical devices, such as elevators or downspouts, which vary between voltages in the range 110-117-120 volts and voltages in the 220-230-240 volts range. Thus 110 or 120V output from a 230V input can allow 100 or 120V elements to be put into use in a 230V region. The autotransformer winding has approximately three outputs, in which the electrical connections are made properly. A variable autotransformer is generated as the coil parts of the winding are exposed, producing the secondary connection by sliding a contact, resulting in a variation in the turns ratio.
EM7013 purpose motors
An autotransformer may have some advantages, such as being smaller in size, lighter in weight, and more economical than a standard dual winding transformer. However, the autotransformer can not provide adequate electrical insulation. Transformers are determined according to numerous factors. Classifications are predetermined according to different criteria, such as the purpose of each device, as well as the type, number of phases and core material, for example.