Fractional pole-to-branch ratio lap winding connection method

Abstract

The invention discloses a fractional pole-to-branch ratio lap winding connection method. A pole pair number of windings is an odd number, a number of slots per pole per phase is 2n, and n is a randompositive integer; each phase of winding is the same in distribution rule; in four parallel branches which form each phase of winding, each two branches are the same in distribution rule of the windings, and by regulating a coil spread of certain two pairs of poles, fractional pole-to-branch ratio wave windings of which the spreads are equal to 3*2n, 3*2n-1 and 3*2n+(2n-1) slot pitches. According to the invention, the theoretical limitation of a conventional alternating current winding is broken through; the fractional pole-to-branch ratio lap winding connection method is provided for a motor of which the pole pair number is the odd number; the conflict that a large-scaled pumped storage motor and a hydraulic turbine generator are unmatched in capacity, voltage and rotating speed is effectively solved; performance of the motor is improved; the motor is reasonable in structure, excellent in manufacturability of manufacturing and installation, simple in maintenance and reliable to operate; the technical and economical index of a power station system is improved.

Description

Technical field [0001] The invention relates to the field of alternating current windings, in particular to a method for connecting a fractional pole circuit ratio stacked winding. Background technique [0002] The stator winding is an important part to realize the conversion of electromechanical energy, which directly affects the performance of the motor. According to statistics of the hydro-generators in operation, it is found that the hydro-generators with an odd number of pole pairs are relatively small, and the capacity is also small. The number of branches of the stator winding is mainly one branch and two branches. Limit on the number of selected branches. According to the motor winding theory, the number of branches in the stator winding of a hydroelectric generator with an odd number of pole pairs is either too few or too many. There are no four-branch windings, or even three-branch windings. This is also this type of hydroelectric generator. An important reason for fe...

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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