CN205792345U - Oil-extracting screw pump driving control system - Google Patents

Abstract

The open a kind of oil-extracting screw pump driving control system of this utility model, including three-phase alternating-current supply and screw pump, the rectified module of three-phase alternating-current supply, motor drive module are connected with motor, motor is connected with screw pump through pump rod, motor is built-in type permanent-magnet torque motor, connecting on motor has stator voltage zero sample module, stator voltage zero sample module to be connected with the first input end of controller, and the outfan of controller is connected with motor drive module；Stator voltage zero sample module includes the stator neutral lead drawn by motor, and this stator neutral lead is connected with the first input end of controller through the first resistance, the second resistance eutral grounding, the common port that the first resistance, the second resistance connect.Beneficial effect: motor operational efficiency is high, safe and reliable, energy-conserving and environment-protective effectively prevent the mechanical accidents such as pump rod fracture, add the oil recovery time, reduce the workload of staff.

Description

Oil-extracting screw pump driving control system

Technical field

This utility model relates to motor-drive technique field, specifically, is that a kind of oil-extracting screw pump drives Control system.

Background technology

In China, screw pump is little as a kind of volume, one-time investment is few, the oil production equipment of instant effect, It is widely used in each elephant.

But traditional mechanical oil production machine also exists a lot of problem, such as, classic screw pump uses machine Tool transmission, uses common asynchronous motor to drive the rotation of screw pump, spiral shell by belt and change speed gear box The moment of bar pump is uncontrollable, when down-hole occurs exception or floor outlet pipeline to occur to block, and screw pump Speed the most uncontrollable, cause the velocity of rotation of screw pump to be always maintained at constant, so will make Becoming screw pump pump rod to twist off, change speed gear box internal gear ruptures, and even can cause motor damage, Frequent Accidents, Mechanical loss is big, affects oil recovery efficiency, and workload is big, as shown in Figure 1.

Utility model content

In order to solve the problems referred to above, the utility model proposes a kind of efficiency height, energy-conserving and environment-protective, oil recovery time The oil-extracting screw pump driving control system long, mechanical accident is few, it uses built-in type permanent-magnet torque motor to pass Dynamic system replaces machine driving.

For reaching above-mentioned purpose, the concrete technical scheme that this utility model uses is as follows:

A kind of oil-extracting screw pump driving control system, including three-phase alternating-current supply and screw pump, its key exists In: the rectified module of described three-phase alternating-current supply, motor drive module drive motor work, described motor Output shaft is connected with described screw pump through pump rod, and described motor is built-in type permanent-magnet torque motor, described Connect on motor and have stator voltage zero sample module, described stator voltage zero sample module and controller First input end connect, the outfan of described controller is connected with described motor drive module, for right The output voltage electric current of described motor drive module is controlled, and reaches control the rotating speed of described motor and turn The purpose of square；Described stator voltage zero sample module includes that the stator neutral point drawn by described motor is drawn Outlet, this stator neutral lead successively through the first resistance, the second resistance eutral grounding, described first resistance, The common port of the second resistance is connected with the first input end of described controller.

By above-mentioned design, motor uses dedicated built-in formula permanent magnet torque motor to replace common asynchronous electric Machine, utilizes this motor direct-drive pump rod, eliminates change speed gear box and the bel-drivenn of mechanical driving part Part, not only efficiency is high, but also considerably reduces mechanical loss；And controller can be by control Motor drive module processed changes motor torque, it is achieved motor stepless speed control, and neutral to motor stator The voltage of point carries out zero crossing and is acquired, and can deduce the position that rotor is current, the most permissible Avoid installing the position sensor of detection rotor on motor, it is to avoid motor is transported by position sensor It is constant that row, maintenance cause, and has saved the cost of motor rotation simultaneously.

Further describe, in order to the output signal of controller is changed into the signal that standard is unified, described It is connected between controller with described motor drive module and has Isolation Amplifier Module.

Further describe, the second input of described controller be also associated with voltage x current sampling module, The sampling end of described voltage x current sampling module is connected between described motor drive module and motor.

Use such scheme, by gathering the output voltage of motor drive module, electric current, can be the most right Motor is protected, and prevents motor input current or overtension from motor causing damage or burns.

Further describe, the 3rd input of described controller is also associated with busbar voltage sampling mould Block, the sampling end of described busbar voltage sampling module is connected to described rectification module and drives mould with described motor Between block.

Using such scheme, busbar voltage sampling module Real-time Collection busbar voltage, when busbar voltage is too high Or time too low, the signal that controller is gathered by busbar voltage sampling module in real time makes the action of correspondence, Protection motor.

Further describing, described motor drive module uses three-phase bridge type converter, and uses H_PWM-L_PWM modulation system is adjusted.

Using such scheme, controller controls the power switch of three-phase bridge type converter, it is achieved read motor Enter voltage x current to be controlled, thus realize, to rotating speed, the control of torque, using H_PWM-L_PWM Modulation system, the voltage pulsation of centerline is maximum, such that it is able to effectively reacted the change of winding self-induction Situation, more accurately detects the fluctuation situation of built-in type permanent-magnet torque motor neutral point voltage, thus Infer and the relation of stator winding inductance, thus judge the position of rotor.

Preferably, described controller control chip is STM32F103RCT6.

The beneficial effects of the utility model: use built-in type permanent-magnet torque motor directly to drive screw pump, effect Rate is high, and energy-conserving and environment-protective effectively prevent the mechanical accidents such as pump rod fracture, add the oil recovery time, reduce The workload of staff；When underground occurs husky stifled in short-term, and controller can be accomplished to allow motor the most defeated Go out the moment of torsion higher than nominal torque, when the situation such as oil well oil-free and screw pump underloading occurs, controller energy Enough identification；By gathering motor stator neutral point voltage zero crossing, realize rotor is positioned, keep away Exempt from installation site sensor in motor, made motor run relatively reliable convenience；The control system of this motor System use H_PWM-L_PWM modulation system, make system have stepless speed regulation, soft start, callipers brake car, The defencive functions such as fault alarm.

Accompanying drawing explanation

Fig. 1 traditional mechanical formula motor-driven assembling schematic diagram in well system；

Fig. 2 is built-in type permanent-magnet torque motor and screw pump assembling schematic diagram in well system；

Fig. 3 is structural principle block diagram of the present utility model；

Fig. 4 is H_PWM-L_PWM modulation system schematic diagram of the present utility model.

1. three-phase alternating-current supply in figure, 2. screw pump, 3. rectification module, 4. motor drive module, 5. electricity Machine, 6. stator voltage zero sample module, 7. controller, 8. Isolation Amplifier Module, 9. voltage x current Sampling module, 10. busbar voltage sampling module, 101. pump rods, 102. pump rod centralizers, 103. oil pipes, 104. stators, 105. rotors, 106. limiting plates, 107. anchors, 108. screen casings, 109. tail pipes, 110. is different Step motor, 111. belts, 112, change speed gear box.

Detailed description of the invention

Below in conjunction with the accompanying drawings detailed description of the invention of the present utility model and operation principle are made the most in detail Explanation.

Example in real time:

Figure it is seen that a kind of oil-extracting screw pump driving control system, including three-phase alternating-current supply 1 With screw pump 2, the rectified module of three-phase alternating-current supply 13, motor drive module 4 drive motor 5 to work, Motor 5 output shaft is connected with screw pump 2 through pump rod 101, and motor 5 is built-in brushless direct current permanent magnetic power Torque motor.Stator voltage zero sample module 6, stator is had from figure 3, it can be seen that connect on motor 5 Point of zero voltage sampling module 6 is connected with the first input end of controller 7, the outfan of controller 7 and electricity Machine drives module 4 to connect, and for being controlled the output voltage electric current of motor drive module 4, reaches Controlling rotating speed and the purpose of torque of motor 5, stator voltage zero sample module 6 includes being drawn by motor 5 The stator neutral lead gone out, this stator neutral lead through the first resistance, the second resistance eutral grounding, First resistance, the common port of the second resistance are connected with the first input end of controller 7.

From fig. 3 it can also be seen that be also associated with voltage x current sampling on the second input of controller 7 Module 9, the sampling end of voltage x current sampling module 9 is connected between motor drive module 4 and motor 5, For gathering motor 5 three-phase voltage and current of electric.

From fig. 3 it can also be seen that be also associated with busbar voltage sampling on the 3rd input of controller 7 Module 10, the sampling end of busbar voltage sampling module 10 is connected to rectification module 3 and motor drive module 4 Between, it is used for gathering busbar voltage.

Motor drive module 4 uses three-phase bridge type converter, and uses H_PWM-L_PWM modulation methods Formula is adjusted, and motor works under 120 ° of conduction modes, and i.e. every switching tube turns on 120 °, each Moment only has two phase winding conductings, another phase winding floating；A switching tube is just had every 60 ° of electrical angles Turning off, another switching tube is open-minded, is specifically shown in Fig. 4.

As one preferred embodiment, controller 7 control chip is STM32F103RCT6.

Operation principle of the present utility model: after three-phase alternating-current supply 1 rectified module 3 rectification, will exchange Electricity is converted into unidirectional current, then the three-phase bridge type converter through motor drive module 4, is controlled by controller 7 The power switch of three-phase bridge type converter processed, is controlled electric moter voltage electric current, thus controls motor and turn Speed and torque；On motor, wherein it is also associated with power stator voltage zero sample module, through stator voltage Zero sample module 6, gathers electric moter voltage crossover point signal, obtains motor phase inversion signal, determines that motor turns The position of son, it is to avoid install motor rotor position sensor in motor, makes motor run, safeguards more Adding convenient and reliable, the busbar voltage of rectification module 3 output is entered by busbar voltage sampling module 10 in real time simultaneously Row gathers, and when busbar voltage is too high, controller 7 controls motor drive module 4 not output signal, real Motor 5 now carries out overvoltage protection, and voltage x current sampling module 9 motor in real time drives mould simultaneously The voltage of block 4 output, electric current, when voltage, electric current are too high, it is dynamic that corresponding protection made by controller 7 Make, make motor operational efficiency high, energy-conserving and environment-protective, effectively prevent the mechanical accidents such as pump rod fracture, add The oil recovery time, reduce the workload of staff.

Claims (6)

1. an oil-extracting screw pump driving control system, including three-phase alternating-current supply (1) and screw pump (2), it is characterized in that: described three-phase alternating-current supply (1) rectified module (3), motor drive module (4) drive motor (5) work, and described motor (5) output shaft is connected with described screw pump (2) through pump rod；Described motor (5) is built-in type permanent-magnet torque motor, stator voltage zero sample module (6) is had in the upper connection of described motor (5), described stator voltage zero sample module (6) is connected with the first input end of controller (7), the outfan of described controller (7) is connected with described motor drive module (4), for the output voltage electric current of described motor drive module (4) is controlled, reach to control rotating speed and the purpose of torque of described motor (5)；

Described stator voltage zero sample module (6) includes the stator neutral lead drawn by described motor (5), this stator neutral lead is successively through the first resistance, the second resistance eutral grounding, and described first resistance, the common port of the second resistance are connected with the first input end of described controller (7).

Oil-extracting screw pump driving control system the most according to claim 1, it is characterised in that: it is connected between described controller (7) with described motor drive module (4) and has Isolation Amplifier Module (8).

Oil-extracting screw pump driving control system the most according to claim 2, it is characterized in that: on the second input of described controller (7), be also associated with voltage x current sampling module (9), the sampling end of described voltage x current sampling module (9) is connected between described motor drive module (4) and motor (5), is used for gathering described motor (5) three-phase voltage and current of electric.

Oil-extracting screw pump driving control system the most according to claim 1, it is characterized in that: on the 3rd input of described controller (7), be also associated with busbar voltage sampling module (10), the sampling end of described busbar voltage sampling module (10) is connected between described rectification module (3) and described motor drive module (4), is used for gathering busbar voltage.

Oil-extracting screw pump driving control system the most according to claim 1, it is characterised in that: described motor drive module (4) uses three-phase bridge type converter, and uses H_PWM-L_PWM modulation system to be adjusted.

Oil-extracting screw pump driving control system the most according to claim 1, it is characterised in that: described controller (7) control chip is STM32F103RCT6.