Motor capacity of transformation

(a) the necessity of transformation and significance When bearing drainage area appeared for excess water, drainage pumping station often appear the following deficiencies: 1. To normal operation of super water pump head. 2. Because of water level super hump, unable to stop and have to stop. 3. The pump can satisfy the requirement of head, but as a result of rising lift shaft power rise, make the form a complete set of motor overload and had to stop. 4. The unit can continue to run, but restricted by diesel generating set motor capacity, water pump was forced to can only be run at the small blade Angle and the flow condition, make water pump water ability can not get sufficient play. For more than 3, 4 two situations, such as able to motor capacity of technical innovation, it can increase the pumping station recovery and drainage ability, so as to speed up the drainage, drainage time, to avoid and reduce the purpose of flood losses. (2) the capacity of transformation method For different kinds of capacity, and the status of the use of motor capacity of technical innovation for different methods should be administered. 1. Large pump motor Large pumping station are generally not synchronous motor, the motor can be realized by changing the way of the motor winding the compatibilizing. Since the eighty s, insulation level had the very big, for its more than 6 kw motor stator insulation not only in terms of overall performance has improved a lot, and the thickness is thinned 20% ~ 30%, which makes electric JiShu slot with more space. So in transformation of motor in line, can use the electric JiShu groove put more conductive body, increase the rated capacity of the motor. Practice shows that the modification is can make the motor rated capacity increases by 5% ~ 20%. At the same time, because after transforming the insulation level and allows all have a certain degree of temperature increase, thus can also be correspondingly enhance the overload capacity of the motor. 2. 

The small and medium-sized pump motor Small and medium sized pumping station used for asynchronous motor, and model is mainly for the J series, JS series and Y series, etc. The J series motor, because of the high energy consumption, backward technology, countries have explicitly give fall into disuse, so for this series motor is unfavorable in line simple transformation, should be thoroughly replacement for the new type of motor. But should fully consider when replacement pump station operation requirements, increasing the capacity of the new motor. For Y and JS series motor, due to its trough filled with rate don't have much allowance, so can't adopt the way of changing winding increases put electrical conductor to increase. But the aging of the use of time is not long, not serious the series motor can be connected by star - triangle series hybrid winding method is expanded. That the original 60 ° phase with three phase winding is divided into two sets of three-phase windings, one USES the y connection, another set of the delta connection. On the spatial phase differences between two sets of winding Angle of 30 ° electricity. Winding star connection part of the phase lag the triangle with center part of the electrical Angle of 30 ° with center. Practice shows that the modified method can improve the motor performance, improve the winding coefficient, make the motor rated 8500w gasoline generator capacity increased by 5% ~ 10%.