Improved structure of open tooth groove of end punching sheet of generator stator core

Abstract

The invention provides an improved structure of an open tooth groove of an end punching sheet of a generator stator core. The improved structure is characterized in that a groove is punched in a punching sheet tooth part of the stepped stacked iron core at the upper end and the lower end of a stator; the upper end and the lower end of the iron core are in a stepped form; when the iron core is stacked, the stator punching sheet with the groove in the tooth part is adopted by the stepped end part; the upper and lower two segments of end iron cores are firmly pasted by a silicon steel sheet adhesive; and the groove is stuffed with a special-shaped insulating plate which is wrapped with a presoak conformal felt. According to the groove provided by the invention, a leakage flux passage of the end part is effectively blocked; and heating of the end part of the iron core is significantly reduced, so that uneven heating of the end part of a stator bar in the axial direction is also significantly reduced; safe and stable operation of a motor is ensured; and the insulation lifetime of a motor winding is prolonged. Meanwhile, the tooth groove is stuffed with the special-shaped insulating plate which is wrapped with the presoak conformal felt, so that a motor manufacturing practice proves that bouncing of the tooth part of the stator core is objectively reduced by the design; and the product quality is improved.

Description

technical field [0001] The invention belongs to the field of manufacturing large and medium-sized hydroelectric generators, and mainly relates to an improved structure for opening grooves on the teeth of punched pieces at the end of the stator iron core of the generator. Background technique [0002] The design of the stator core structure of the hydro-generator is an old proposition. At present, various equipment manufacturers at home and abroad have formed several relatively finalized design ideas. Among them, regarding the method of reducing the flux leakage loss at the upper and lower ends of the stator core, because the hydropower station owners generally do not pay enough attention to this issue, the structural design schemes of domestic manufacturers are not perfect (there are many foreign countries with novel ideas and ingenious designs. approach), from the overall level of the industry, its technology is not yet mature enough. The upper and lower ends of the stator...

AI Technical Summary

Problems solved by technology

The stepped structure at the end of the core is as shown in the description of the attached drawings figure 1 As shown in , the traditional stepped structure only weakens the flux leakage at the end of the core, but still forms eddy currents at the end of the core, which still causes heat at the end

Especially in large and medium-sized hydropower units, although the heating at the end has been weakened to a certain extent, the effect is not obvious enough

The recent practice of hydropower equipment manufacturing, installation and operation has proved that the heating of the upper and lower ends of the stator core has hidden dangers to the stable operation of the generator.

The traditional design structure has very limited weakening of the magnetic flux leakage at the end, and there is still heat at the end of the iron core, resulting in significant uneven heating at the axial end of the stator bar

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