CN211127640U

CN211127640U - Permanent magnet motor dragging reactive feedback integrated device

Info

Publication number: CN211127640U
Application number: CN202020038341.9U
Authority: CN
Inventors: 来现利; 赵福生; 白杨
Original assignee: Kelamayi Borui Technology Development Co ltd
Current assignee: Kelamayi Borui Technology Development Co ltd
Priority date: 2020-01-08
Filing date: 2020-01-08
Publication date: 2020-07-28
Anticipated expiration: 2030-01-08

Abstract

The utility model belongs to the oil field is with beam-pumping unit field, discloses a permanent-magnet machine drags reactive feedback integrated device, including multi-terminal permanent-magnet machine and switch board, multi-terminal permanent-magnet machine includes stator, rotor, its characterized in that, and the stator is equipped with stator winding, every stator winding has corresponding rated back electromotive force, is equipped with a plurality of input terminals on stator winding, and input terminal is equipped with common input end, high-power input, miniwatt reactive feedback input, and every input terminal is connected through the ac contactor of switch board to the power inlet wire, and it has the mechanical equipment operation to drive. Not only simplifies the quantity of well site equipment of the oil pumping unit, but also can effectively reduce the engineering investment.

Description

Permanent magnet motor dragging reactive feedback integrated device

The technical field is as follows:

the utility model belongs to the oil field is with beam-pumping unit field, concretely relates to permanent-magnet machine drags reactive feedback integrated device.

Background art:

in the production process of the oil field, the widely used oil pumping unit enables an oil extraction system to become the first energy-consuming large user of the oil field. Because the starting inertia of the beam-pumping unit is large, only the motor with large equipment capacity can be normally started; the capacity of the motor is smaller when the oil is normally extracted, and the average load rate of the motor is only about 25.0%. Because the motor is an inductive load, when the load rate is very low, the working efficiency and the power factor are also very low, and the energy-saving limit value of the power factor of the beam-pumping unit is only 0.4 according to the energy-saving monitoring specification of an oil field production system (GB/T3145-2015); the power factor of the pumping unit is too low, so that the network loss of a power distribution network is increased, and the quality of the power supply voltage and the production safety are seriously influenced. The power factor of the pumping unit is too low and the trolley is pulled by the motor, so that the beam pumping unit has great energy-saving potential objectively in two aspects.

Experiments prove that: the permanent magnet motor is very sensitive to the magnitude of power supply voltage, and under different magnitude of power supply voltage, compared with the rated back electromotive force of the permanent magnet motor, the running characteristics can be summarized as the following three points: when the power supply voltage is consistent with the rated back electromotive force of the permanent magnet motor, the power factor of the permanent magnet motor is higher, and the starting and loading capacity is consistent with the factory design value of the permanent magnet motor; when the power supply voltage is higher than the rated counter electromotive force of the permanent magnet motor, the permanent magnet motor is equivalent to a motor with enlarged capacity, the power factor is lower than a factory design value, but the starting and loading capacity of the motor is higher than the factory design value; when the supply voltage is lower than the rated back emf of the permanent magnet motor, the permanent magnet motor will be equivalent to the combination of the motor and the synchronous phase modifier, and the sum of the capacities of the motor and the synchronous phase modifier is equal to the rated capacity of the permanent magnet motor. At the moment, the rated power of the motor is lower than that of the permanent magnet motor, and the starting and loading capacity is lower than the original design value; the capacity allocation of the motor and the synchronous phase modifier depends on the degree of the lower of the supply voltage and the rated back electromotive force of the permanent magnet motor, the less the lower the power rating of the motor and the lower the power rating of the synchronous phase modifier and vice versa.

According to the electric motor which has large starting inertia and needs larger power when being started, the beam-pumping unit is driven by the electric motor; when the motor is started and normally runs, the required power is low, the condition that the configuration power of the motor meeting the starting requirement is overlarge is combined with the characteristics of the permanent magnet motor under different power supply voltages, the characteristics that the permanent magnet motor does not need exciting current and is high in running efficiency are fully utilized, and the rated back electromotive force of the motor is changed by changing the number of turns of a stator winding of the permanent magnet motor during starting and running through the control cabinet, so that the purpose of three purposes of one machine, namely high-power starting, low-power and synchronous phase modulator running is realized under the condition that the power supply voltage is constant.

The high-power starting solves the problems of large starting inertia of the oil pumping unit and small starting torque of the permanent magnet motor; the small-power and synchronous phase modulator operates, and the problems of low efficiency and low power factor caused by a large horse-drawn trolley in the operation process of the oil pumping unit are solved.

In order to solve the problem of secondary starting in the process of switching from high power to low power after the pumping unit is started, when the control cabinet is started, the high-power input terminal and the low-power input terminal of the permanent magnet motor are electrified simultaneously, after the starting is finished, the high-power input terminal is cut off, and the low-power input terminal is continuously electrified to keep running.

In order to avoid the problems that the pumping unit stops due to overload caused by pump clamping, wax clamping and the like in the operation process of the pumping unit, when the control cabinet adopts a low-power state and overload occurs in the design, the control cabinet is automatically switched to a high-power state, so that the failure and stop times of the pumping unit are reduced; when overload occurs after the high-power state is switched, the pumping unit automatically stops running, and the safety of equipment such as the pumping unit is ensured.

The utility model has the following contents:

the utility model aims at overcoming prior art's defect, provide a permanent-magnet machine drags reactive feedback integrated device, solved the problem that current beam-pumping unit dragging device power factor, load factor and operating efficiency are low, also solved the great problem of little and power factor difference on different oil wells of permanent magnetism dragging device start-up torque, not only simplified the quantity of beam-pumping unit well site equipment, also can effectively reduce the engineering investment.

In order to solve the technical problem, the utility model provides a following technical scheme:

the utility model provides a permanent-magnet machine drags reactive feedback integrated device, includes multi-terminal permanent-magnet machine and switch board, multi-terminal permanent-magnet machine includes stator, rotor, its characterized in that, the stator is equipped with stator winding 4, every stator winding has corresponding rated back electromotive force, is equipped with a plurality of input terminals on stator winding, and the input terminal is equipped with common input 3, high-power input 2, miniwatt reactive feedback input 1, and the power inlet wire passes through the ac contactor of switch board and connects every input terminal, drives mechanical equipment operation.

Preferably, the number of stator windings is two or more.

Preferably, the number of turns of the stator winding is seven groups.

Preferably, when the permanent magnet motor is started, the input terminals are electrified simultaneously, and through a certain time delay, the terminal with the rated back electromotive force corresponding to at least one input terminal lower than the power supply voltage of the permanent magnet motor stops supplying power, and the terminal with the rated back electromotive force corresponding to at least one input terminal higher than the power supply voltage of the permanent magnet motor continues supplying power.

Compared with the prior art, the utility model discloses following beneficial effect has:

the device for realizing large-torque starting and low-power operation and transmitting no power to a power grid is realized by utilizing the characteristics of the permanent magnet motor and controlling the different turns of the stator winding of the permanent magnet motor in the starting and operating processes. Because the permanent magnet motor is in an over-excitation state, the permanent magnet motor also transmits a certain proportion of reactive power to the power grid while dragging the pumping unit, and the reactive power is used for the reactive power compensation of other pumping units and transformers, thereby improving the power factor of the whole power grid and reducing the transmission loss of the power grid.

Drawings

Fig. 1 is the structure schematic diagram of the permanent magnet motor dragging reactive feedback integrated device of the utility model.

Fig. 2 is the stator winding structure diagram of the permanent magnet motor dragging reactive feedback integrated device.

Fig. 3 is the utility model discloses permanent-magnet machine drags reactive feedback integrated device's switch board wiring schematic diagram.

A. B, C- -control cabinet three-phase power input terminal; DK-air switch; CJ 1-small power reactive feedback contactor main contact; CJ 2-main contact of high power contactor; m- -a permanent magnet motor; u1, V1, W1- -a low power reactive feedback terminal; u2, V2, W2-high power terminal.

Detailed Description

For a better explanation of the invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

As shown in fig. 1, the permanent magnet motor dragging reactive feedback integrated device comprises a multi-terminal permanent magnet motor and a control cabinet, wherein the multi-terminal permanent magnet motor comprises a stator and a rotor, the stator is provided with stator windings 4, the number of the stator windings is two or more, and the number of turns of the stator windings is 7. Each stator winding has a corresponding rated back electromotive force, a plurality of input terminals are arranged on the stator windings, the input terminals are provided with a public input end 3, a high-power input end 2 and a low-power reactive feedback input end 1, and a power supply inlet wire is connected with each input terminal through an alternating current contactor of the control cabinet to drive mechanical equipment to operate.

The power inlet wire of the integrated dragging device of the oil pumping unit is respectively connected with a high-power (starting) terminal and a low-power reactive feedback (operating) terminal of a permanent magnet motor through two alternating current contactors of a control cabinet.

When the permanent magnet motor is started, the input terminals are electrified simultaneously, through a certain time delay, the terminal with the rated back electromotive force corresponding to at least one input terminal lower than the power voltage of the permanent magnet motor stops supplying power, and the terminal with the rated back electromotive force corresponding to at least one input terminal higher than the power voltage of the permanent magnet motor continues supplying power.

As shown in fig. 2, the permanent magnet motor changes a single stator winding of a common permanent magnet motor into two windings in a center-tapped manner, and the rated back electromotive force of each winding is different. The number of stator windings and the number of turns of the permanent magnet motor.

As shown in fig. 3, the low-power reactive feedback end of the permanent magnet motor is connected to the low-power reactive feedback ac contactor, the low-power reactive feedback ac contactor is connected to the three-phase power input end of the air switch, the high-power end of the permanent magnet motor is connected to the high-power ac contactor, and the high-power ac contactor is connected to the three-phase power input end. When the control cabinet is started, a high-power terminal and a low-power reactive feedback of the permanent magnet motor are connected to a power supply through CJ2 and CJ 1. After the pumping unit is started, CJ2 is stopped through time relay delay control.

In a low-power reactive feedback (CJ1 electrified) running state, if the permanent magnet motor is in an overload state due to overlarge load of the oil pumping unit, the RJ2 acts to enable the low-power + reactive feedback running state to return to a high-power running state again, and the running is kept under a lower power factor so as to ensure the normal production of an oil field; when the motor is still in an overload state for a long time in a high-power running state, the RJ1 acts, and the pumping unit stops running so as to ensure the safety of equipment.

The permanent magnet dragging and reactive feedback integrated device can be further optimized or/and improved according to actual needs: through the test, the utility model discloses a technological effect does: the utility model discloses compare active power saving rate with conventional drive device: more than 10 percent; the utility model discloses compare idle power saving rate with conventional drive device: more than 250 percent.

The above description is only for the purpose of illustrating embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made by those skilled in the art within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a permanent-magnet machine drags reactive feedback integrated device, includes multi-terminal permanent-magnet machine and switch board, multi-terminal permanent-magnet machine includes stator, rotor, its characterized in that, stator winding (4), every stator winding has corresponding rated back electromotive force, is equipped with a plurality of input terminals on stator winding, and the input terminal is equipped with common input (3), high-power input (2), miniwatt reactive feedback input (1), and every input terminal is connected through the ac contactor of switch board to the power inlet wire, drives and has mechanical equipment operation.

2. The integrated pm machine dragging var feedback device according to claim 1, wherein the number of stator windings is two or more.

3. The integrated pm machine dragging var feedback device according to claim 1, wherein the number of stator winding turns is seven.

4. The integrated pm machine dragging var feedback device according to claim 1, wherein during startup, the input terminals are simultaneously charged, and after a certain time delay, at least one terminal having a rated back emf lower than the supply voltage of the pm machine stops supplying power, and at least one terminal having a rated back emf higher than the supply voltage of the pm machine continues supplying power.