6/8/12-pole single-winding three-speed asynchronous motor stator winding mode

Abstract

The invention belongs to the technical field of squirrel-cage type asynchronous motor stator winding design, and in particular relates to a 6 / 8 / 12-pole single-winding three-speed asynchronous motor stator winding mode. According to the stator of the motor, only a set of winding is adopted, and by adjusting the tap of the winding and changing the linking mode of the winding, three structural modes of 6 / 8 / 12 poles can be achieved in one winding arrangement mode, three different rotation speeds can be achieved, and the purpose of energy conservation is achieved. By adopting the stator winding mode provided by the invention, annular flow consumption caused by mutual influence of different windings of a double-winding multi-speed motor can be eliminated while the practical operation requirements of an oil field are met, and meanwhile compared with frequency variation speed adjustment, the mode prevents a power grid from harmonic pollution, and improves the electric energy quality and the operation reliability of the power grid.

Description

technical field [0001] The invention belongs to the technical field of stator winding design of a squirrel-cage asynchronous motor, in particular to a stator winding type of a 6 / 8 / 12-pole single-winding three-speed asynchronous motor. Background technique [0002] The crude oil output of my country's oilfields is relatively high in the initial stage of exploitation, and the beam pumping unit systems used are all working in a high-yielding state. At present, due to the long mining time, the crude oil output of most domestic oilfields has dropped sharply, and the pumping units are all working in a low-yielding state. . With the deepening of mining, the number of low-yield wells has become more and more, and most of the motors configured have the phenomenon of "big horses and small carts", resulting in a lot of waste of electric energy. In order to achieve the purpose of saving energy, oilfields currently use energy-saving control methods that reduce the speed for low-productio...

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Problems solved by technology

[0003] 1) Two-speed motor: most of the pole-changing speed-regulating motors used in oilfields are two-speed motors, and two-speed motors generally adopt 8, 12 poles or 12, 16 poles double winding design, although it has the effect of reducing the speed, But the speed regulation range is small, and the energy-saving effect is not ideal in some occasions

More importantly, when the oil well needs to be cleaned up, the motor speed is required to be high, and the synchronous speeds of these two winding designs are only 750 rpm and 500 rpm, respectively, which cannot meet the needs of well cleaning. The purpose of well cleaning is to replace the high-speed motor, which makes it necessary to replace the motor frequently in actual operation and increase the production cost

[0004] 2) Frequency conversion speed regulation: When the oil field uses the frequency converter to regulate the speed, usually when the well washing operation is performed, the pumping unit runs at the power frequency (that is, the speed is not reduced), and when the oil well is in normal operation, according to the reduction in oil production Reduce the frequency (that is, the speed of the motor decreases), but the change of the frequency is not an automatic adjustment method, but mostly a fixed frequency is artificially set. In this case, the motor runs at a fixed frequency, which cannot achieve the speed regulation and energy saving. Purpose, in fact, this control method does not reflect the advantages of large frequency control range

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