Asymmetric four-branch fractional slot stack winding connection method

Abstract

The invention discloses an asymmetric four-branch fractional slot stack winding connection method, The winding is a double layer winding composed of a pole phase group and the half pole phase group serially connected with each other according to the principle of electric potential addition. The pole phase group and the half pole phase group are serially connected with each other according to the principle of electric potential addition. The coil is composed of an upper wire bar and a lower wire bar connected with each other through an end part, and the coil is an equal pitch coil. Each phase winding consists of four parallel branches. The invention breaks the restriction condition of the traditional symmetrical winding, provides an asymmetrical four-branch fractional slot stack winding connection method for motor with odd pole number, The contradiction between the capacity, voltage and rotational speed of the large pumped storage motor and the hydro-generator is effectively solved. Onthe premise of ensuring the performance of the hydro-turbine, the performance of the motor is improved, the structure of the motor is reasonable, the manufacturing and installation process is excellent, the maintenance is simple, the operation is reliable, and the technical and economic indexes of the whole power station system are improved.

Description

technical field [0001] The invention relates to the field of AC winding design, in particular to an asymmetrical four-branch split-slot stacked 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 prominent...

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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