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Novel tri-power, efficient, energy-saving three-phase asynchronous motor used for oil extractor

A high-efficiency, energy-saving, three-phase asynchronous technology, applied in the field of electric motors, can solve the problems such as the inability to guarantee the best working state of the motor, the reduction of efficiency and power factor, and the increase of system loss, achieving significant power saving effect, improved power factor, Effect of no-load current drop

Inactive Publication Date: 2009-06-03
南阳华晟辰电机工程有限责任公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has caused two problems in practice: one is that the actual load rate of the motor is small, the efficiency and power factor decrease, and a serious waste of electric energy is caused; the other is that the operating load fluctuation causes the system loss to increase
The Y-Δ connection conversion winding is relatively advanced, but it only has two power levels, and the switching is complicated. The power ratio of these two levels is limited to a fixed value. , cannot be adjusted, of course, there is no guarantee that the motor will run in the best working condition
Generally speaking, these technical solutions have little improvement in performance, high cost, complex control conversion, and poor reliability, which cannot really meet the needs of my country's oilfields, and are actually difficult to popularize and apply.

Method used

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  • Novel tri-power, efficient, energy-saving three-phase asynchronous motor used for oil extractor
  • Novel tri-power, efficient, energy-saving three-phase asynchronous motor used for oil extractor
  • Novel tri-power, efficient, energy-saving three-phase asynchronous motor used for oil extractor

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Embodiment 1

[0023] The embodiment is specifically described by taking a three-phase winding with the number of poles 2p=8 and the number of slots Z=72 commonly used in the pumping unit motor as an example. Such as Figure 5 , 6 , 7, and 8, Figure 5 Shown is the number of poles 2p = 8, the number of slots Z = 72 slot number phase diagram. Figure 6 Shown is the three-phase slot number coil distribution scheme of the standard 60° phase belt winding, which corresponds to the low power gear of the motor of the present invention; on the basis of this scheme, according to the characteristics of the load condition of the pumping unit, select to remove 4 slots per phase slot number, obtained as Figure 7 The winding scheme corresponding to the middle power gear shown in the figure, further, choose to remove 8 slot numbers for each phase, and get as follows Figure 8 The winding scheme shown corresponds to high power.

[0024] for Figure 5 , 6 , 7, 8 winding scheme, Figure 9 It lists th...

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Abstract

The invention discloses a novel tri-power, efficient, energy-saving three-phase asynchronous motor used for an oil extractor, which comprises a rotor and a stator winding; the stator winding adopts the unique 3Y composite series connection method and the novel technology of turn removal; the stator winding corresponds to a low power grade, a medium power grade and a high power grade, and the number of turns of serial coils in each phase reduces with the power grade, with the low grade power corresponding to a maximum number of turns and the high grade power corresponding to a minimum number of turns; and the switch among the three power grades is achieved by three contactors. As the invention has the high, the medium and the low power grades which are all available for option, and the high power grade has a high start-up torque and is applied to starting the oil extractor, the motor can automatically operate at the low or medium power grade on the completion of the start-up process, and can realize two-way automatic switch of operating power according to the change in the working condition of an oil well. As the motor has the advantages of great start-up torque, high operating efficiency and power factor, convenient control, good reliability and remarkably reduced no load current, the motor can achieve better energy-saving effect.

Description

technical field [0001] The invention belongs to the technical field of motors, in particular to a novel three-power, high-efficiency and energy-saving three-phase asynchronous motor for a pumping unit. Background technique [0002] The beam pumping unit is the most widely used mechanical device in oil exploitation in my country. The load characteristic of its dragging motor requires a large starting torque, but the actual operating load torque is not large. In order to adapt to such a load, the starting torque is generally required to be more than 3 to 4 times the actual load torque when selecting a motor. In addition, the load of the motor of the pumping unit fluctuates periodically. When it is lifted, the motor is loaded and absorbs power from the grid. When it is down, the motor is lightly loaded, and may even work in the state of power generation, sending electric energy to the grid. This has caused two problems in practice: one is that the actual load rate of the moto...

Claims

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Application Information

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IPC IPC(8): H02K17/12H02K3/28
Inventor 王雪帆王德林王晓星刘盈长李志远
Owner 南阳华晟辰电机工程有限责任公司
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