Asymmetrical three-branch cross concentrated wave winding connection method

Abstract

The invention discloses an asymmetrical three-branch cross concentrated wave winding connection method. The number of pole pairs of windings is an odd number; the number of slots in each pole of eachphase is 3n; n is an arbitrary positive integer; distribution rules of windings in each phase are same; namely, the winding of each phase comprises two phase belts; each phase belt is formed by one and a half parallel branch windings; distribution rules of windings in each branch are same to form symmetric windings of asymmetrical branches. The asymmetrical three-branch cross concentrated wave winding connection method breaks the limitation of traditional alternating-current winding theory and provides an asymmetrical three-branch cross concentrated wave winding connection method for a motor with odd pole pairs; the conflict that capacities, voltage and rotation rates of a large pumped-hydro energy storage motor and a hydraulic turbine generator are not matched is effectively solved; the performance of the motor is improved, so that the motor is reasonable in structure, excellent in manufacturability and mountability, simple to maintain and reliable in operation; the technical and economical indexes of a power plant system are improved.

Description

technical field [0001] The invention relates to the field of AC windings, in particular to an asymmetric three-branch cross-type concentrated wave winding connection method. Background technique [0002] The stator winding is an important part to realize electromechanical energy conversion, which directly affects the performance of the motor. According to the statistics of hydro-generators put into operation, there are relatively few hydro-generators with an odd number of pole pairs, and the capacity is also small. The limit on the number of selected branches. According to the theory of motor windings, the number of parallel branches of the stator windings of hydroelectric generators with an odd number of pole pairs is either too few or too many, and there are no four-branch windings, or even three-branch windings. A big reason for fewer generators. However, as the capacity increases, the contradiction between capacity, voltage and rotational speed will become more promin...

AI Technical Summary

Problems solved by technology

With the increase of capacity, the contradiction between capacity, voltage and rotational speed becomes more prominent, which brings difficulties to motor design, unreasonable motor performance and structure, and poor technical and economic indicators of power station system.

In the past, the solution was to either give up the superior performance of the turbine at this speed and use other speed turbines, or accept the unreasonable performance of the motor, which is expensive

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