CN206180924U - Motor energy -saving control system - Google Patents

Abstract

The utility model relates to an electricity governing system, concretely relates to motor energy -saving control system, including regulating unit, the power -on is crossed regulating unit and is supplied power for electric machine coil, current sampling circuit and isolation voltage sampling circuit are kept apart to corresponding being equipped with of electric machine coil, the forward wave form and the negative sense wave form of keeping apart the current signal of current sampling circuit collection divide two tunnel TI+ that export the inside AD conversion of controller to respectively after the rectification of electric current rectifier circuit is for the positive value, TI the pin, the voltage signal's that isolation voltage sampling circuit gathered forward wave form and the negative sense wave form exported the rectification of voltage rectifier circuit to the inside AD conversion of controller respectively for branch two tunnel behind the positive value TU+, TU the pin, the controller output pin connection is to regulating unit. The utility model discloses can the real -time detection electric efficiency for power input power is followed the change of motor output power and is changed, guarantees the motor and works all the time at high -efficiency zone, reduces the energy consumption.

Description

Electrical machine energy-saving control system

Technical field

This utility model is related to a kind of electric regulating system, and in particular to a kind of electrical machine energy-saving control system.

Background technology

With developing rapidly for China's industrial and agricultural production, the demand of electric energy is increasing, exploitation and energy saving into The task of top priority.Used as a kind of important power-equipment, the power consumption of asynchronous motor is very big.These asynchronous motors one As be all to carry out selection according to the load of design, but in actual use, mostly Jing is often in underloading, or even the fortune under zero load OK.Therefore, the phenomenon of " low load with strong power " is almost very common.

At present, in China, commercial production constantly develops, and energy day is becoming tight, and in the case that environmental requirement is increasingly surging, carries High motor operation efficiency can greatly alleviate energy shortage situation, improve national economic profit, with highly important reality meaning Justice.In order to improve the work efficiency of motor, for many years countries in the world are from the manufacturing and designing of motor, the selection use of motor, electrical network Several aspects such as power supply management are started with, and have made numerous studies work, achieve preferable achievement.Wherein manufacturing and designing from motor Aspect is started with, and have developed high-efficiency energy-saving motor, significantly improves efficiency, can energy-conservation in a large number.But this motor cost is higher, And economic effect significantly depends on the situation of load, i.e., for long-term work is in nominal load, the applied field of continuous operation Close, its energy-saving effect can reach most preferably.But for most of motor users, how to make the motor on existing equipment work in effect The higher state of rate seems more real.

Utility model content

To solve above-mentioned technical problem, the purpose of this utility model is：A kind of electrical machine energy-saving control system is provided, can Real-time detection electric efficiency so that power input to machine follows the change of output power of motor and changes, it is ensured that motor work all the time Make in high efficient area, reducing energy consumption.

The technical scheme that this utility model is adopted by solution its technical problem for：

The electrical machine energy-saving control system, including adjustment unit, power supply is powered by adjustment unit for motor coil, motor Coil is correspondingly provided with isolation current sampling circuit and isolation voltage sample circuit, isolates the current signal of current sampling circuit collection Positive waveform and negative sense waveform be respectively that a point two-way is exported to controller inside A/D and turned after Jing current rectification circuit rectifies TI+, TI- pin for changing, the positive waveform and negative sense waveform of the voltage signal of isolation voltage sample circuit collection is respectively by voltage Rectifier circuit rectifies be on the occasion of rear point of two-way export to controller inside A/D conversion TU+, TU- pin, controller output pin It is connected to adjustment unit.

This utility model power supply is powered by adjustment unit for motor coil, and adjustment unit can be with the input of regulation motor electricity Pressure, under working condition, the operating current and terminal voltage of motor coil are taken respectively by isolating current sampling circuit and isolation voltage Sample circuit is acquired, and the electric current for collecting and voltage signal include that forward signal also includes negative-going signal, if directly will adopt The curtage signal of collection is sent to controller, and controller needs to recognize the positive and negative when needing to expend substantial amounts of of curtage Between, it is to save data transfer and calculating time, before electric current and voltage signal send into controller, current rectification is first passed through respectively Electric current and voltage signal whole rectification are forward signal by circuit and voltage rectifying circuit, and pass through difference to signal by positive and negative Pin be acquired discrete acquisitions, specially：

Controller to represent voltage on the occasion of numerical value carry out discrete sampling, obtain numerical value Un+, (n=1,2,3 ..., N；N= 32、64、128、256)；Controller carries out discrete sampling to the numerical value for representing voltage negative value, obtains numerical value Un-, (n=1,2, 3 ..., N；N=32,64,128,256)；Controller to represent electric current on the occasion of numerical value carry out discrete sampling, obtain numerical value In+, (n =1,2,3 ..., N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current negative value, obtains numerical value In-, (n=1,2,3 ..., N；N=32,64,128,256)；Wherein, sampling period Tp=20ms/N (N=32,64,128, 256)；Controller completes following calculating：

S=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+ (UN-)(IN-)+(U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+ (UN-) (IN+), wherein (N=32,64,128,256)；

P=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+ (UN-)(IN-)-((U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+ (IN+)), (UN-) wherein (N=32,64,128,256)；

Electric efficiency η=KCOS φ+X1=KP/S+X1, wherein K represents equivalent coefficient, and X1 represents correction value；Obtain After electric efficiency, input voltage of the adjustment unit to motor is adjusted by PID, and then cause power input to a machine and output work Rate matches, energy efficient.

Wherein, preferred version is：

The adjustment unit includes IGCT T1 and IGCT T2, the IGCT T3 of reverse parallel connection and the brilliant lock of reverse parallel connection The IGCT T5 and IGCT T6 of pipe T4 and reverse parallel connection, power end R, S, T are respectively by IGCT T1 and IGCT T2, crystalline substance Brake tube T3 and IGCT T4, IGCT T5 and IGCT T6 are in turn connected to the three-phase coil of motor, and correspondence IGCT T1-T6 sets Drive circuit is put, drive circuit input is connected to controller output end, and controller adjusts SCR-output by drive circuit Voltage, and then the input voltage of regulation motor coil, using digital trigger technology, three-phase equilibrium degree is high, drives regulation circuit to adopt It is capable of achieving with available circuit structure, is no longer described in detail herein.

Described also to include touch display screen, the touch display screen is connected with controller, can be aobvious by touch display screen Show current motor efficiency, input voltage, operating current, apparent energy, active power, reactive power, power factor etc., it is also possible to The each running parameter of motor is adjusted by touch display screen, is to ensure motor smooth starting, soft start can be adopted.

The power supply is powered by adjustment unit or catalyst for motor coil, and adjustment unit is in parallel with catalyst, is being adjusted During section cell failure, motor current supply circuit can be connected by catalyst, it is ensured that motor can normally run.

Also include control button, the control button is connected with controller, and control button includes digital keys, start and stop key Deng, motor parameters, the setting of electrical machine energy-saving amount can be set by control button, minimum sets, PID parameters Setting etc..

The power supply is correspondingly provided with synchronous sampling circuit, and synchronous sampling circuit outfan is connected to controller, and controller can Real-time detection external electrical network voltage parameter, and the minimum voltage of user's setting can automatically be adjusted according to external electrical network parameter It is whole, specifically, when the rising of external electrical network voltage is detected, according to the ratio that external electrical network voltage rises, to user's setting Minimum voltage carries out decline in proportion；Conversely, when external voltage decline is detected, according to the ratio that external electrical network voltage declines Example, rising in proportion is carried out to the minimum voltage that user sets, and to ensure that real output value is constant, synchronous sampling circuit is adopted Available circuit structure.

If detecting negative power factor, i.e. motor to fall under power generation situation, adjustment unit can be automatically switched to and turned on entirely, Avoid impact of the motor to each device in adjustment unit.

Compared with prior art, this utility model has the advantages that：

This utility model can real-time detection electric efficiency, by regulation motor terminal voltage, adjust power input to machine, make Power input to machine follows all the time the change of output power of motor and changes, so that motor always works in high efficient area, reaches To energy-conservation purpose；Empirical tests, empty load of motor economize on electricity is overall to economize on electricity up to 15%~35% or so up to 50%~70% or so, Power of motor grade from several kilowatts to several megawatts, electric pressure from 380VAC to 10 kilovolt more than.

Description of the drawings

Fig. 1 is the schematic diagram of embodiment 1.

Fig. 2 is adjustment unit and motor connection circuit diagram.

Fig. 3 is current rectification circuit and voltage rectifying circuit circuit theory diagrams.

Specific embodiment

This utility model embodiment is described further below in conjunction with the accompanying drawings：

Embodiment 1：

As shown in figure 1, electrical machine energy-saving control system described in the utility model, including adjustment unit, power supply is by adjusting list Unit powers for motor coil, and motor coil is correspondingly provided with isolation current sampling circuit and isolation voltage sample circuit, isolates electric current The positive waveform and negative sense waveform of the current signal of sample circuit collection is respectively to be divided to two after Jing current rectification circuit rectifies Road is exported to TI+, TI- pin of controller inside A/D conversions, the forward wave of the voltage signal of isolation voltage sample circuit collection Shape and negative sense waveform respectively by voltage rectifying circuit rectification be on the occasion of rear point of two-way export to controller inside A/D conversion TU+, TU- pins, controller output pin is connected to adjustment unit.

As shown in Fig. 2 left-hand broken line frame represents adjustment unit in figure, right side dotted line frame represents motor coil and external cabling Box is exported, and adjustment unit includes IGCT T1 and IGCT T2, the IGCT T3 and IGCT T4 of reverse parallel connection of reverse parallel connection And the IGCT T5 and IGCT T6 of reverse parallel connection, power end R, S, T are respectively by IGCT T1 and IGCT T2, IGCT T3 and IGCT T4, IGCT T5 and IGCT T6 are in turn connected to the three-phase coil of motor, specially：The connection of R ends adjusts single The T1 of unit, T2 inputs, while connect motor V2 ends, T1, T2 outfan connection motor U1 ends；S ends connect the T3 of adjustment unit, T4 inputs, while connect motor W2 ends, T3, T4 outfan connection motor V1 ends；T ends connect the T5 of adjustment unit, T6 inputs End, while connecting motor U2 ends, T5, T6 outfan connection motor W1 ends, correspondence IGCT T1-T6 arranges drive circuit, drives Circuit input end is connected to controller output end, and controller adjusts SCR-output voltage by drive circuit, and then adjusts electricity The input voltage of machine coil, using digital trigger technology, three-phase equilibrium degree is high, and driving adjusts circuit and is using available circuit structure It is capable of achieving, no longer describes in detail herein.

The present embodiment also includes touch display screen and control button, and the touch display screen is connected with controller, can lead to Cross touch display screen and show current motor efficiency, input voltage, operating current, apparent energy, active power, reactive power, work( Rate factor etc., it is also possible to be adjusted to each running parameter of motor by touch display screen, is to ensure motor smooth starting, can be adopted Use soft start；The control button is connected with controller, and control button includes digital keys, start and stop key etc., can be pressed by control Key assignments motor parameters, the setting of electrical machine energy-saving amount, minimum setting, the setting of PID parameters etc.；Power supply passes through Adjustment unit or catalyst are powered for motor coil, and adjustment unit is in parallel with catalyst, in adjustment unit failure, can be by connecing Tentaculum connects motor current supply circuit, it is ensured that motor can normally run；Power supply is correspondingly provided with synchronous sampling circuit, synchronized sampling electricity Road outfan is connected to controller, controller can real-time detection external electrical network voltage parameter, and can be right according to external electrical network parameter The minimum voltage of user's setting is automatically adjusted, specifically, when the rising of external electrical network voltage is detected, according to external electrical network The ratio that voltage rises, decline in proportion is carried out to the minimum voltage that user sets；Conversely, declining when external voltage is detected When, according to the ratio that external electrical network voltage declines, rising in proportion is carried out to the minimum voltage that user sets, to ensure reality Output valve it is constant, synchronous sampling circuit adopt available circuit structure；Lead to for convenience of data of this equipment between external equipment Letter, can be the RS485 interfaces of controller setting peripheral hardware, it is also possible to arrange wireless communication module and carry out data transmission, for example, 2/3/ 4G modules.

As shown in figure 3, Iin is adjustment unit output arrives input of the electric current of motor Jing after isolation, Uin is that adjustment unit is defeated Go out input of the voltage to motor Jing after isolation, U1, U2, U3, U4, U5, U6 are 6 operational amplifiers, R, R1 are resistance, R= 2R1, D1-D8 are diode, and Iin is input into Jing after such as figure processing of circuit, and 2 tunnels, referred to as In-, In+ are exported respectively；Uin inputs Jing is such as After figure processing of circuit, 2 tunnels, referred to as Un-, Un+ are exported respectively；M1 is controller, and inside can be selected to possess A/D converter MCU or dsp chip；In-, In+, Un-, Un+ are connected respectively to the TI- of M1 inside A/D conversions, and TI+, TU-, TU+ pin is above-mentioned Rectification circuit by electric current and voltage difference rectification be two-way on the occasion of signal, be sent directly to controller and processed, accelerate control The processing speed of device.

This utility model power supply is powered by adjustment unit for motor coil, and adjustment unit can be with the input of regulation motor electricity Pressure, under working condition, the operating current and terminal voltage of motor coil are taken respectively by isolating current sampling circuit and isolation voltage Sample circuit is acquired, and the electric current for collecting and voltage signal include that forward signal also includes negative-going signal, if directly will adopt The curtage signal of collection is sent to controller, and controller needs to recognize the positive and negative when needing to expend substantial amounts of of curtage Between, it is to save data transfer and calculating time, before electric current and voltage signal send into controller, current rectification is first passed through respectively Electric current and voltage signal whole rectification are forward signal by circuit and voltage rectifying circuit, and pass through difference to signal by positive and negative Pin be acquired discrete acquisitions, specially：

Controller to represent voltage on the occasion of numerical value carry out discrete sampling, obtain numerical value Un+, (n=1,2,3 ..., N；N= 32、64、128、256)；Controller carries out discrete sampling to the numerical value for representing voltage negative value, obtains numerical value Un-, (n=1,2, 3 ..., N；N=32,64,128,256)；Controller to represent electric current on the occasion of numerical value carry out discrete sampling, obtain numerical value In+, (n =1,2,3 ..., N；N=32,64,128,256)；Controller carries out discrete sampling to the numerical value for representing electric current negative value, obtains numerical value In-, (n=1,2,3 ..., N；N=32,64,128,256)；Wherein, sampling period Tp=20ms/N (N=32,64,128, 256)；Controller completes following calculating：

S=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+ (UN-)(IN-)+(U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+ (UN-) (IN+), wherein (N=32,64,128,256)；

P=(U1+) (I1+)+(U2+) (I2+)+... ..+ (UN+) (IN+)+(U1-) (I1-)+(U2-) (I2-)+... ..+ (UN-)(IN-)-((U1+)(I1-)+(U2+)(I2-)+…..+(UN+)(IN-)+(U1-)(I1+)+(U2-)(I2+)+…..+ (IN+)), (UN-) wherein (N=32,64,128,256)；

Electric efficiency η=KCOS φ+X1=KP/S+X1, wherein K represents equivalent coefficient, and X1 represents correction value；Obtain After electric efficiency, input voltage of the adjustment unit to motor is adjusted by PID, and then cause power input to a machine and output work Rate matches, energy efficient.

If detecting negative power factor, i.e. motor to fall under power generation situation, adjustment unit can be automatically switched to and turned on entirely, Avoid impact of the motor to each device in adjustment unit.

This utility model can real-time detection electric efficiency, by regulation motor terminal voltage, adjust power input to machine, make Power input to machine follows all the time the change of output power of motor and changes, so that motor always works in high efficient area, reaches To energy-conservation purpose；Empirical tests, empty load of motor economize on electricity is overall to economize on electricity up to 15%~35% or so up to 50%~70% or so, Power of motor grade from several kilowatts to several megawatts, electric pressure from 380VAC to 10 kilovolt more than.

Claims (6)

1. a kind of electrical machine energy-saving control system, it is characterised in that including adjustment unit, power supply is motor coil by adjustment unit Power supply, motor coil is correspondingly provided with isolation current sampling circuit and isolation voltage sample circuit, isolation current sampling circuit collection Current signal positive waveform and negative sense waveform be respectively that a point two-way is exported to control after Jing current rectification circuit rectifies TI+, TI- pin of device inside A/D conversions, the positive waveform and negative sense waveform of the voltage signal of isolation voltage sample circuit collection It is respectively TU+, TU- pin exported on the occasion of rear point of two-way to the A/D conversions of controller inside by voltage rectifying circuit rectification, controls Device output pin is connected to adjustment unit.

2. electrical machine energy-saving control system according to claim 1, it is characterised in that the adjustment unit includes reverse parallel connection IGCT T1 and IGCT T2, the IGCT T5 of the IGCT T3 of reverse parallel connection and IGCT T4 and reverse parallel connection and brilliant lock Pipe T6, power end R, S, T are respectively by IGCT T1 and IGCT T2, IGCT T3 and IGCT T4, IGCT T5 and brilliant lock Pipe T6 is in turn connected to the three-phase coil of motor, and correspondence IGCT T1-T6 arranges drive circuit, and drive circuit input is connected to Controller output end.

3. electrical machine energy-saving control system according to claim 1, it is characterised in that also including touch display screen, it is described to touch Touch display screen to be connected with controller.

4. electrical machine energy-saving control system according to claim 1, it is characterised in that the power supply is by adjustment unit or connects Tentaculum is powered for motor coil, and adjustment unit is in parallel with catalyst.

5. electrical machine energy-saving control system according to claim 1, it is characterised in that also including control button, the control Button is connected with controller.

6. electrical machine energy-saving control system according to claim 1, it is characterised in that the power supply is correspondingly provided with synchronized sampling Circuit, synchronous sampling circuit outfan is connected to controller.