Double-speed four-power energy-saving three-phase asynchronous motor

Abstract

The invention relates to a double-speed four-power energy-saving three-phase asynchronous motor, the electromagnetic scheme design combines multi-power electromagnetic winding technology and multi-speed motor novel phase interchanging pole changing electromagnetic winding technology to form a novel motor winding 3Y + Y / 3Y connection technical scheme, and by switching by a control cabinet, double-speed and four-power are realized on one motor, thus satisfying special using requirements of different loads and adjusting parameters (changing stroke times) of a well pumping unit. The technology of double-speed and four-power realized on one motor product not only solves the problem that a strong horse pulls a small cart, namely the well pumping unit uses one motor to pump oil, but also changes the stroke times of the well pumping unit. The product is widely suitable for power transmission of a walking beam or belt well pumping unit.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a high-performance special motor for industrial equipment and its control technology. Background technique [0002] The operating conditions of oilfield pumping units are characterized by heavy-load starting and light-load operation. In order to meet the needs of the starting power of the pumping unit, the motor is selected according to the load at the time of starting. The efficiency and power factor are low, which wastes electric energy and reduces the quality of power grid operation. At present, most of the motors used in pumping units are Y series motors, YCT electromagnetic speed-adjusting motors, high-slip motors, permanent magnet synchronous motors, etc., most of which are in the state of "big horse-drawn cart". After the pumping unit is started, the motor efficiency is average At 25-35%, the power factor is 0.2-0.4, which not only wastes a lot of electric ener...

AI Technical Summary

Problems solved by technology

[0002] The operating conditions of oilfield pumping units are characterized by heavy-load starting and light-load operation. In order to meet the needs of the starting power of the pumping unit, the motor is selected according to the load at the time of starting. The efficiency and power factor are low, which wastes electric energy and reduces the quality of power grid operation

At present, most of the motors used in pumping units are Y series motors, YCT electromagnetic speed-adjusting motors, high-slip motors, permanent magnet synchronous motors, etc., most of which are in the state of "big horse-drawn cart". After the pumping unit is started, the motor efficiency is average At 25-35%, the power factor is 0.2-0.4, which not only wastes a lot of electric energy, but also reduces the quality of grid operation

When the amount of oil seepage in the oil well changes, the pumping unit needs to adjust the working parameters (such as changing the number of strokes), which requires changing the pumping unit speed. At present, the oil field adopts the following methods: 1), using multi-speed motors and electromagnetic speed-adjusting motors And change the diameter of the pulley on the supporting motor of the pumping unit. Although the multi-speed motor can change the speed, its efficiency and power factor are lower than those of the Y series three-phase asynchronous motor with the same power; the electromagnetic speed regulating motor is a constant torque motor. By changing the excitation current and adjusting the load speed, although the stroke times of the pumping unit can be changed, the electromagnetic speed regulating motor has a slip ratio with the speed of the motor driving it, so the efficiency of this kind of motor is also low, and it is bulky and difficult to install. , inconvenient operation

2) The use of high-slip motors solves the problem of over-installation capacity to a certain extent, but due to the large rotor resistance, the loss of the motor itself is increased, and the efficiency of the motor is greatly reduced

For example, the phase-changing and pole-changing winding wiring method of the two-speed motor 3Y+Y / 3Y connection method, this kind of winding design and winding connection method realizes two speeds of a motor and improves the reliability of variable speed switching, but it is not convenient ground output for various power requirements

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