According to Alstom electromagnetic design program selection groove principle, the number of slots available for hydroelectric power station on the 10th there are 462,468,480 for preferred and 492 slots. Four slots by electromagnetic calculations, electromagnetic and mechanical vibration calculation, temperature calculation, calculation of ventilation and cooling calculations and operational stability as well as comparison of stator winding and winding connection of form, and by comparison generator costs, and ultimately determine the the best solution for the 480 slots electromagnetic solution.

Electromagnetic load the electromagnetic flux density idling program is designed to calculate the value lo130Gs, beyond the domestic value of the upper range value of about 20%. Design and calculation of electrical loads is 588A / cm, also beyond the national average of the value of the range. Electromagnetic load increase can effectively reduce the fixed length of the rotor core, to improve the utilization factor of the generator, the generator saving effective material, reduce the cost of the generator.

Gap stator and rotor gap using uniform air gap, the air gap is 12. smm, this value is calculated magnetic air gap, when the generator is installed to ensure that the gap is mechanical design value. Effect of thermal expansion and mechanical deformation, mechanical design value slightly larger than the gap value of the magnetic gap calculated considering the unit is running.

Stator and rotor core length of the rotor core (including the pole plate) and the same length of the stator core. This can reduce the fixed end portion of the magnetic flux leakage between the rotor, reducing circulation (for non-transposition or 36. The degree of transposition of the stator coil) between the stator coil strands, reduce losses, lower temperature, but also increase Generator in capabilities to run.

Due to the given rotor pole gap, the air gap between the rotor is uniform, so the rotor poles pole piece outer shape three arcs style. Size three arcs is determined by finite element analysis and calculation of electromagnetic fields. Compared with the traditional domestic pole piece structure, which reduces the amount of copper rotors with.