CN1188340A - Winding energy-saving motor and controller for beam-pumping unit - Google Patents

Abstract

The present invention provides a wirewound energy-saving motor for well pumping unit and its control device. Its stator is equipped with two Y-type windings which can be parallelly used. The powers of said two windings are distributed according to a certain proportion, and their middle points are connected together. Said invention has a shared rotor, and said rotor winding is connected with three-phase bridge rectifier circuit through slide ring, then connected with two series-connected starting resistors, and the power electronic switch is parallelly connected on the resistor. Said control device consists of current mutual inductor, A. C. contactor, one-chip computer and motion transducer. Said invention uses one-chip computer to control A. C. contactor to select different winding to make operation and control power electronic switch so as to raise motor and pump efficiency and attain the goal of saving energy.

Description

The winding energy-saving motor and the control device that are used for oil pumper

The present invention relates to a kind of drive motors and control device of beam-pumping unit.

At present, beam-pumping unit is the main oil production equipment of using on the oil field, but the starting torque of beam-pumping unit is big, and counterbalance effect is poor.Because the variation of suction operating mode, load change is bigger in a stroke, and these factors have determined must leave certain surplus when selecting pumping-unit motor for use, and motor is when actual motion, in most cases its load factor is 50～60%, have in addition be lower than 50%.Efficiency of motor and power factor (PF) all reduce like this, cause energy consumption increase as.

The objective of the invention is to design a kind of winding energy-saving motor and control device that is used for oil pumper, in actual production, make motor that higher efficient and power factor (PF) be arranged, play purpose of energy saving.

The object of the present invention is achieved like this, forms winding energy-saving motor and control device thereof by motor stator, rotor and control device.On the stator of motor design have two can the Y type winding that uses in parallel, the power of two windings is made as P1 and P2 respectively, the pass between its power is that P1/ (P1+P2)=P2/P1=0.618～0.7, two winding has a rotor.The rotor winding connects three-phase commutation bridge through slip ring, connects starting resistance after the rectification, is parallel with the electronic power switch device with resistance.Control device is by current transformer, and formations such as A.C. contactor, single-chip microcomputer and displacement transducer on two stator winding electric power incoming lines, are connected with A.C. contactor respectively, and inlet wire all passes current transformer; The output interface of single-chip microcomputer is communicated with microcontroller power supply with the relay switch of two ac contactor coils to be provided by rectifying voltage regulator, and single-chip microcomputer provides control signal for electronic power switch device T1 and T2.Single-chip microcomputer is monitored the voltage and current of motor in real time, will detect with parameters calculated and send digital display unit by interface.

The present invention is owing to be designed to two power with the stator winding of winding motor and distribute by a certain percentage, again can the Y type winding that use in parallel, and the mid point of two windings links together, and two cover windings can insert power supply respectively, also can insert power supply in back in parallel; The rotor winding connects three-phase bridge rectifier circuit behind slip ring, connect two series connection starting resistances after the rectification, adopt the Single-chip Controlling A.C. contactor to select different winding operations, make motor have three kinds of power to be complementary, improved efficiency of motor with load under the different operating modes; Single-chip Controlling electronic power switch break-make is slowed down motor when oil pumper commutates, improving the efficiency of pump, thereby reach the purpose of energy saving of system.Single-chip microcomputer can also realize to motor monitoring, protection and to the calculating and the demonstration of power consumption.

Accompanying drawing is according to the winding energy-saving motor of oil pumper and the circuit theory diagrams of control device of being used for provided by the present invention.

Among the figure, 1-double winding formula asynchronous motor, 2-current transformer; 3-current signal rectification circuit, 4-rectifying voltage regulator, 5-single-chip microcomputer (as 8096); the 6-displacement transducer; 7-rotor winding rectifier bridge, 8-manually manipulates stock quotations, the 9-nixie display; R1 and R2 are high-power resistance; T1 and T2 are electronic power switch device (as GTR or IGBT etc.), and D1, C1, R3, R4 form the du/dt protective circuit of T1, and D2, C 2, R5, R6 form the du/dt protective circuit of T2.

Describe the concrete course of work that is used for the winding energy-saving motor and the control device thereof of oil pumper provided by the present invention in detail below in conjunction with accompanying drawing.

During starting, switch closure on 5 shillings of KM1 of single-chip microcomputer and the KM2 path of winding, send pulse-width signal to T1 again, starting current can be controlled in 2 times of rated current, and the starting torque height, when starting current reduces to 1.4 times of left and right sides of rated current, make T1 open-minded, send out width-modulation pulse to T2 again, R2 is excised gradually, when electric current during, make T2 also open-minded near rated current.Starting process is more steady like this, can also control the starting time.After the starting, the electric current judgement that single-chip microcomputer is gathered according to current transformer, if the total load rate is lower than 60%, the P2 winding that can break, the isolated operation of P1 winding; If the total load rate is lower than 40%, the P1 winding that can break, the isolated operation of P2 winding.In running, according to loading condition, another winding can put into operation at any time.When operation, single-chip microcomputer is obtained displacement signal from displacement transducer 6, when oil pumper commutates, by sending width-modulation pulse to T2 motor is suitably slowed down, and slows down reversing impact, can also improve the coefficient of fullness of pump, improves the efficiency of pump.

Adopt winding energy-saving motor and the control device thereof for oil pumper provided by the present invention, its advantage is, (1) have on the motor stator two can be in parallel Y type winding, power distributes according to a certain percentage, can form Three power P 1, P2 and P1+P2, when heavy duty, two windings all put into operation, in when carrying, P1 around Group puts into operation, and during underloading, the P2 winding puts into operation, and namely in different loading ranges, motor has different Power matches, so that the load factor of motor always is between 0.7～1.0, at this load factor model In enclosing, the efficient of motor and power factor (PF) are all higher, thereby reach the energy-conservation purpose of motor itself; (2) in commutation By regulating the crosstalk resistance of rotor winding institute, suitably slow down in the some place, the impact that slows down pumping unit system improves pump efficiency Rate realizes improving system effectiveness, thereby reaches the purpose of energy saving of system; (3) when oil pumper commutates, motor The mechanical property deliquescing, slow down pumping unit system and impact, the cooperation of improvement machine, bar, pump can prolong workover treatment Cycle; (4) adopt the wound rotor series resistance starting, starting current reduces greatly, has reduced starting current pair The impact of electrical network, starting torque improves simultaneously, and when selecting motor, power can suitably descend; (5) owing to adopt Use Single-chip Controlling, can realize easily the protection of overload (overcurrent), short circuit, overvoltage, disconnected phase, can count Calculate power, power factor (PF) and electric work, and show these parameters. The present invention is not only applicable to beam pumping unit, Be applicable to chain type oil pump.

Claims (2)

1. a winding energy-saving motor and control device that is used for oil pumper, form by motor stator, rotor and control system, it is characterized in that, with the stator design of motor have two can the Y type winding that use in parallel, the power of two windings is made as P1 and P2 respectively, P1/ (P1+P2) ≈ P2/P1=0.618-0.7 then, two stator winding have a rotor; Control system by current transformer, A.C. contactor, single-chip microcomputer and displacement transducer etc. constitute, on two winding electric power incoming lines, be connected with A.C. contactor, inlet wire respectively and all pass current transformer; The output interface of single-chip microcomputer is communicated with the relay switch of two ac contactor coils.

2. winding energy-saving motor and the control device that is used for oil pumper according to claim 1; it is characterized in that; said rotor winding connects three-phase bridge rectifier circuit behind slip ring; meet high-power resistance R1, the R2 of two series connection after the rectification; in parallel two electronic power switch T1, T2 on the resistance are made of the du/dt protective circuit of electronic power switch T1 and T2 diode, capacitor, resistance series connection.

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