Theoretical justification of the possibility of reducing vibrations of electromagnetic origin in a five-phase alternating current machine in comparison with a three-phase machine

Аuthors

Tereshkin V. M.

Ufa State Aviation Technical University, USATU, 12, K. Marx str., Ufa, 450008, Republic of Bashkortostan, Russia

e-mail: tvm53@mail.ru

Abstract

Multiphase electric machines with an odd number of phases can become an alternative to three-phase machines in areas where a stable rotation speed within one revolution of the shaft is required, as well as other areas requiring highly reliable electric drives with low noise and vibration, for example in special ventilation systems and complexes .

The problem of formation of the resulting current of 3-phase and 5-phase windings, which are fed from the bridge converter, is considered in the work. A comparative analysis of the resulting currents is given from the point of view of the harmonic composition. In solving the problem, a classical approach was used with the use of the vector method.

It was found that the components of the phase currents of the 5-phase symmetrical winding form the 1^st and 11^th harmonics of the resulting forward current and the 9^th harmonic of the reverse sequence.

The third and seventh harmonics of the phase currents do not form a rotating field; their temporal alternation does not coincide with the spatial alternation of phases. The 5^th harmonic of the resulting current is absent; in the phase-current spectrum of a 5-phase symmetrical winding, the 5^th harmonic component is not contained.

The components of the phase currents of the 3-phase symmetrical winding form the 1^st and 7^th harmonics of the resulting forward current, as well as the 5^th and 11^th harmonic of the reverse sequence.

The 3^rd and 9^th harmonics of the resulting current are absent, because in the phase-current spectrum of the 3-phase symmetrical winding, the 3^rd and 9^th harmonic components are not contained.

By harmonic composition, the resultant current of the 5-phase winding takes precedence over the resultant current by a 3-phase winding. This allows us to assume that within the period of the first harmonic (fundamental rotation frequency) in a 5-phase winding, the vibrations of electromagnetic origin will be less than for the three phase windings.

Experimental studies of prototypes of 5-phase and 3-phase synchronous machines made using identical magnetic systems have shown that the level of mechanical vibrations of a 5-phase machine is lower than that of a 3-phase machine.

Keywords:

five-phase motor winding, three-phase motor winding, resultant harmonic vectors of the phase currents of the five-phase winding, resulting vectors of the harmonics of the phase currents of the three-phase winding, braking the field of the resultant phase current vectors of the five-phase winding

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