Development of a pole-changeable winding with a pole ratio of 8/4 for multi-speed motors

Abstract

Relevance: At present, the analysis of pole-changing windings used in multi-speed motors shows that in many developed circuits of such windings, a large number of output groups and switching contacts, unsatisfactory electromagnetic properties and complex production technology, due to the use of different steps and different branches in manufacturing do not allow them to be widely used in practice. Therefore, research aimed at improving the properties of machines of this type is of great importance. In this regard, pole-changing windings that meet modern electrical engineering requirements remains an urgent task.

Aim: development of a pole- changing winding with a pole ratio of 8/4 and improved electromagnetic properties compared to existing windings.

Methods: the pole-changing winding with a pole ratio of 8/4 developed based on the method of “Discretely specified spatial functions”.

Results: bring the ratio of magnetic inductions in the air gap of the fan electric drive motors closer to 1 and increase the winding coefficient on the pole side p=4.