CN203326948U - Switching circuit of star-shaped / triangular general savor for motor - Google Patents
Switching circuit of star-shaped / triangular general savor for motor Download PDFInfo
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- CN203326948U CN203326948U CN2013201896900U CN201320189690U CN203326948U CN 203326948 U CN203326948 U CN 203326948U CN 2013201896900 U CN2013201896900 U CN 2013201896900U CN 201320189690 U CN201320189690 U CN 201320189690U CN 203326948 U CN203326948 U CN 203326948U
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Abstract
The utility model discloses a star-shaped/ triangular switching circuit for a small-and-medium powered motor. The switching circuit is connected with a three-phase motor and comprises a control circuit and a contractor, the contractor is connected with the control circuit through a sensor and/ or a sampler, two ends of the three-phase motor are connected with delta circuit contactors in a bridging mode, a star circuit contactor is mounted at one end, far away from a three-phase supply, of the three-phase motor, and the control circuit enables the three-phase motor to switch over between a star connection state and a triangular connection state by sucking or releasing the contractor. A switching method comprises the following steps of: confirming a rated power and a rated current and conducting inspection work; and giving a motor switch order to enable the motor to be in a triangular operation state or in a star operation state. The star-shaped/ triangular switching circuit and the switching method have no additional errors, are high in stability and are suitable for used equipment upgrading and new equipment updating. The general savor can be widely popularized, and is quite stable and cheap.
Description
Technical field
The utility model relates to a kind of change-over circuit, especially relates to a kind of motor star/delta Universal electricity-saving device change-over circuit.
Background technology
1), star three conversion domestic existing electricity-saving appliance, if by " power control mode ", can be divided into following 4 classes:; 2), frequency converter pressure regulation; 3), silicon-controlled voltage regulation; 4), reactor pressure regulation.1), the motor current sampling method if by " control signal source ", can be divided into following 2 classes:; 2), power factor sampling method.1), the star three conversion power-saving devices of domestic research and development over 40 years or reactor voltage-regulating electricity-saving device, always use " motor current sampling method " control signal as conversion existing problems:.Seem the simplest and the most direct, actual infeasible.Because the curent change amplitude that only ambient voltage causes has just surpassed the signal code amplitude of variation, in other words: only the 380V voltage of facility environment power supply fluctuates between 340V-420V, and signal just is submerged in disturbance.2), " the frequency converter voltage-regulating electricity-saving device " of domestic research and development or " silicon-controlled voltage regulation electricity-saving appliance ", more use " power factor sampling method " nearly ten years.The same power factor change caused because of ambient voltage is also larger, and power factor is also larger because of the dispersion of the complicated factors such as the makers' copper-steel material material of motor quality, motor process measure, causes signal discrete relatively large; Cause actual popularization to be restricted.The disturbance that 380V voltage fluctuates between 340V-420V, ambient voltage causes of powering when facility environment has approached useful signal itself; But more much better than the 1st kind of method " sampling motor current ", because signal amplitude has been less than perturbation amplitude.Above sampling mode, owing to there being larger environmental perturbation, every machine all must, at the rebuilding old equipment scene, be sent the technical staff to carry out field adjustable and just can come into operation.Therefore spread all is so limited, can't become a kind of universal product that dispatches from the factory and can directly use.
The utility model content
The purpose of this utility model is to provide a kind of motor star/delta Universal electricity-saving device change-over circuit and conversion method, directly measure motor load power as the electricity-saving appliance control signal, except the millesimal measure error of module itself, there is no other additive errors, reflect very accurately the real-time bearing power size of motor, and then accurately controlled star three conversion power-saving operations.
The utility model adopts following technical scheme to realize:
A kind of motor star/delta Universal electricity-saving device change-over circuit, described change-over circuit is connected with three phase electric machine, comprise control circuit and contactor, described contactor is connected with control circuit by transducer and/or sampler, it is characterized in that, the two ends cross-over connection of described three phase electric machine has the delta network contactor, three phase electric machine is equipped with the star circuit contactor away from an end of three phase mains, and described control circuit makes three phase electric machine switching Y-connection state or triangle connection status by adhesive or releasing contactor.
Further, described change-over circuit comprises power-supply filter, three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor, an end near three phase mains is equipped with A.C. contactor, described power-supply filter one end is connected with three phase mains, the other end is connected with power transformer, described power transformer is connected with the low tension switch power supply, and described three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor are connected with computer chip respectively.
Further, also comprise motor temperature sampler, bearing power sampler, charactron display button plate, fault alarm relay, delta contactor, star contactor and the motor switch instruction that is connected in respectively computer chip.
A kind of motor star/delta Universal electricity-saving device conversion method is characterized in that this conversion method comprises the steps:
While 1) moving for the first time the star/delta change-over circuit, input rated power and rated current;
2) change-over circuit, according to rated power and rated current, is patrolled and examined work, and the described work of patrolling and examining comprises patrols and examines three-phase phase-sequence transducer, three-phase voltage sampler, motor temperature sampler, bearing power sampler; Now bearing power is zero, thus control circuit output star contactor KMY signal, adhesive A.C. contactor KMY, the standby condition of motor in the star running;
3) if three-phase phase-sequence negative phase sequence, three-phase electric power open phase occur, supply power voltage is too high, supply power voltage is too low, motor temperature is crossed high fault, control circuit output fault alarm relay signal is broken motor forceful electric power circuit simultaneously;
4) provide the motor switch instruction, adhesive A.C. contactor KMZ, constantly measure the real-time bearing power size of motor, if load exceeds " above jumping the triangle line of demarcation ", discharge " star contactor KMY ", adhesive " delta contactor KM △ ", make motor in the triangle running status;
Or:
If load, lower than " the lower star line of demarcation of jumping ", discharges immediately " delta contactor KM △ ", adhesive " star contactor KMY ", makes motor in the star running status.
Further, in step 4) in, charactron shows every service datas such as motor current, bearing power, star three condition always, as long as the item fault such as transship, short circuit, broken string, load are overweight, charactron shows failure code immediately, and " fault alarm relay " breaks the motor power warning simultaneously.
Further, step 4) complete and also comprise a step 5 afterwards): after the motor switch instruction is cancelled, chip recovers to patrol and examine " three-phase phase-sequence transducer ", " three-phase voltage sampling ", " motor temperature sampling ", " bearing power sampling ", reaches the every data of patrolling and examining of demonstration on charactron, waits for the arrival of next round " motor switch instruction ".
Star three change-over circuits of the present utility model are owing to there not being additive error, therefore be a kind of electricity-saving appliance that possesses high stability, so not only be applicable to rebuilding old equipment, more can dispatch from the factory by supporting new equipment, but can also become a kind of spread, there is high stability, cheap Universal electricity-saving device.
The accompanying drawing explanation
Fig. 1 is the circuit block diagram of star three change-over circuits.
Fig. 2 is the circuit theory diagrams of star three change-over circuits.
Embodiment
By the following description to embodiment; to more contribute to public understanding the utility model; but specific embodiment that can't the applicant is given is considered as the restriction to technical solutions of the utility model, any definition to parts or technical characterictic changed and/or to overall structure do form and immaterial conversion all should be considered as the protection range that the technical solution of the utility model limits.
Motor star/delta Universal electricity-saving device change-over circuit of the present utility model as shown in Figure 1, change-over circuit is connected with three phase electric machine, comprise control circuit and contactor, contactor is connected with control circuit by transducer and/or sampler, the two ends cross-over connection of three phase electric machine has the delta network contactor, three phase electric machine is equipped with the star circuit contactor away from an end of three phase mains, and control circuit makes three phase electric machine switching Y-connection state or triangle connection status by adhesive or releasing contactor.Change-over circuit comprises power-supply filter, three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor, an end near described three phase mains is equipped with A.C. contactor, power-supply filter one end is connected with three phase mains, the other end is connected with power transformer, power transformer is connected with the low tension switch power supply, and three phase sequence transducers, three-phase voltage sampler and motor current sensor are connected with computer chip respectively.
Also comprise in change-over circuit that the motor temperature sampler that is connected to computer chip, bearing power sampler, charactron display button plate, fault alarm relay are in, delta contactor, star contactor and motor switch instruction.
A kind of motor star/delta Universal electricity-saving device conversion method is characterized in that this conversion method comprises the steps:
While 1) moving for the first time the star/delta change-over circuit, input rated power and rated current;
2) change-over circuit, according to rated power and rated current, is patrolled and examined work, and the described work of patrolling and examining comprises patrols and examines three-phase phase-sequence transducer, three-phase voltage sampler, motor temperature sampler, bearing power sampler; Now bearing power is zero, thus control circuit output star contactor KMY signal, adhesive A.C. contactor KMY, the standby condition of motor in the star running;
3) if three-phase phase-sequence negative phase sequence, three-phase electric power open phase occur, supply power voltage is too high, supply power voltage is too low, motor temperature is crossed high fault, control circuit output fault alarm relay signal is broken motor forceful electric power circuit simultaneously;
4) provide the motor switch instruction, adhesive A.C. contactor KMZ, constantly measure the real-time bearing power size of motor, if load exceeds " above jumping the triangle line of demarcation ", discharge " star contactor KMY ", adhesive " delta contactor KM △ ", make motor in the triangle running status;
Or:
If load, lower than " the lower star line of demarcation of jumping ", discharges immediately " delta contactor KM △ ", adhesive " star contactor KMY ", makes motor in the star running status.
In step 4) in, charactron shows every service datas such as motor current, bearing power, star three condition always, as long as the item fault such as transship, short circuit, broken string, load are overweight, charactron shows failure code immediately, and " fault alarm relay " breaks the motor power warning simultaneously.
Step 4) complete and also comprise a step 5 afterwards): after the motor switch instruction is cancelled, chip recovers to patrol and examine " three-phase phase-sequence transducer ", " three-phase voltage sampling ", " motor temperature sampling ", " bearing power sampling ", reaches the every data of patrolling and examining of demonstration on charactron, waits for the arrival of next round " motor switch instruction ".
Three phase mains L1, L2, L3 access arrangement master switch, after master switch closes a floodgate, wherein L12, L13 power to power transformer through power-supply filter, then through low tension switch power supply output+5V ,-the integrated circuit electricity consumption of bis-kinds of power supplys supply computer chip He Ge road I/O channels of 5V.+ 12V supplies with electricity consumption before the photoelectrical coupler of each input channel, supply with electricity consumption after the photoelectrical coupler of each output channel, to guarantee the most basic interference protection measure.Power transformer is output AC 220V voltage also, as each AC contact electric power.After the computer chip energising, as long as equipment manufacturers are before operation for the first time, " rated power ", " rated current " binomial data of on this equipment motor nameplate of " charactron display button plate " upper input, demarcating, chip will automatically recall all operation monitoring data of this specification motor in the scope of 4.0150kw, ever since by this data run.Before obtaining the motor switch instruction, chip just starts to patrol and examine " three-phase phase-sequence transducer ", " three-phase voltage sampling ", " motor temperature sampling ", " bearing power sampling " and shows every data of patrolling and examining.If three-phase phase-sequence negative phase sequence, three-phase electric power open phase occur, supply power voltage is too high, supply power voltage is too low, motor temperature is crossed high fault, all can show failure code No starting motor at charactron.Therefore the time, " bearing power sampling " is zero, thus computer export " star contactor KMY " signal, adhesive A.C. contactor KMY, the standby condition of motor in the star running.When the operative employee provides " motor switch instruction ", the direct adhesive A.C. contactor of this instruction KMZ; Therefore before, in star running standby condition, after the motor energising, by star, implement start-up course, rely on computer chip " electric motor starting completes identification software ", before startup completes motor always in star-like state.Once identify motor starting, complete, the very first time is dropped into " power-saving running monitor state ", with the operating mode of uprushing of the load to occurring at any time, makes sensitive reaction.
In motor operation, " bearing power sampling " software is constantly measured the real-time bearing power size of motor, once load exceeds " above jumping the triangle line of demarcation ", discharge immediately " star contactor KMY ", adhesive " delta contactor KM △ ", make motor in the triangle running status.Otherwise, if load discharges immediately " delta contactor KM △ ", adhesive " star contactor KMY ", makes motor in the star running status lower than " the lower star line of demarcation of jumping ".In this process, charactron shows every service datas such as motor current, bearing power, star three condition always.
" motor current sensor " constantly monitoring in this process, as long as transship, a fault such as short circuit, broken string, load are overweight, charactron shows failure code immediately, and " fault alarm relay " breaks the motor power warning simultaneously.
After " motor switch instruction " cancelled, chip recovers to patrol and examine " three-phase phase-sequence transducer ", " three-phase voltage sampling ", " motor temperature sampling ", " bearing power sampling ", reaches every data etc. of patrolling and examining of demonstration on charactron.Simultaneously, wait for the arrival of next round " motor switch instruction ".
Explanation of nouns:
Upper jumping triangle line of demarcation: constant transform and its application in electromotor load power numerical value of given computer, when motor operates in star-like state, if motor real time execution power is less than this numerical value, motor maintains the star running status always.If motor real time execution power is greater than this numerical value, just computer instruction star A.C. contactor is switched to the triangle A.C. contactor, motor runs on the triangle state.This constant bearing power numerical value is called " above jumping the triangle line of demarcation ".
Lower jumping star line of demarcation: constant transform and its application in electromotor load power numerical value of given computer, when motor operates in the triangle state, if motor real time execution power is greater than this numerical value, motor maintains the triangle running status always.If motor real time execution power is less than this numerical value, just computer instruction triangle A.C. contactor is switched to the star A.C. contactor, motor runs on the star state.This constant bearing power numerical value is called " the lower star line of demarcation of jumping ".These two line of demarcation numerical value are different.
The technical solution of the utility model is the basic forceful electric power circuit changed of main formation star three, with computer chip, into core, is formed basic telemetry circuit by A.C. contactor (KMZ, KM △, KMY).Telemetry circuit is comprised of six road input signal channels (comprising: three-phase phase-sequence transducer, three-phase voltage sampling, motor current sensor, motor temperature sampling, bearing power sampling, motor switch instruction), three-way output signal passage (comprising: fault alarm relay, delta contactor KM △, star contactor KMY), man-machine handshaking interface (charactron display button plate) and power unit (comprising: power-supply filter, power transformer, low tension switch power supply).
" rating of electric machine type identification module " is installed: use display screen and button on the in-local panel in circuit, as long as " rated power " and " rated current " binomial data demarcated on this equipment motor nameplate of input, all logical programs of computer are just automatically by this motor data run; Applicable power of motor scope 4.0kw---150kw.And electricity-saving appliance in the past, must foundation between 4.0---150kw can adaptive motor size dividing several specifications that vary in size can.The machine need not divide concrete specification, a machine general on earth, there is very strong versatility.The utlity model has comprehensive electric motor protecting function, at the three-phase current sampling Zhi Yong of forceful electric power circuit mono-road T--T ' path it " motor current sensor ".And in the past the conventional current sample circuit of motor 2-3 road current sensor need be set can; If only establish 1 tunnel, can't tackle when string has the circuit generation open circuit fault of current transformer.This road motor current signal of the utility model meeting multianalysis, for example string has the circuit of current transformer above-mentioned open circuit fault to occur by break signal is broken " fault alarm relay " according to this, the protection motor is not damaged.
Circuit theory diagrams of the present utility model as shown in Figure 2, the function of schematic diagram: the one, the sampling that " three-phase voltage transducer " sent here " voltage signal input " signal after operational amplifier U1A adjusts, be sent to computer port U3, the 2nd, " current signal input " signal that " motor current sensor " sent here, after operational amplifier U1B adjusts, is sent to " harmonic filter " that operational amplifier U2A forms.Because the impact of motor current harmonic wave, current waveform is always the swinging back and forth of half period along with the synergistic effect of harmonic wave presents 3-5 about second, and this current waveform swung back and forth can't accurately be read phase number.The effect of " harmonic filter " is exactly all harmonic componentss of abundant filtering stack, obtains a pure current sinusoidal and stablizes waveform.After " phase comparator " shaping that this pure current sinusoidal ripple forms through operational amplifier U2B, obtain the square wave of current sinusoidal ripple zero crossing, as with respect to the sinusoidal wave power-factor angle lagged behind of voltage, sending into computer port 14 '." electric current the second operational amplifier " that pure current sinusoidal ripple signal 12 ' is sent into computer port 12 ' simultaneously and again formed through operational amplifier U3A, this current signal is sent into computer port 13 '.
Computer port relies on the following information that obtains:
U3: voltage sine wave signal, computer are further processed as the sinusoidal wave effective value of voltage and voltage over zero phase reference signal.
The 12 ': the first current sinusoidal ripple signal, computer are further processed as the required electric current alarm signal of the machine.The motor of inputting for the first time according to equipment manufacturers " rated power " and " rated current " binomial data, recall this motor operation warning basic parameter of storage from numerous ratings of electric machine of 4.0-150kw scope, just can constantly compare with this current sinusoidal ripple signal, determine whether report to the police.
The 13 ': the second current sinusoidal ripple signal, computer are treated to the sinusoidal wave effective value of meticulous motor current.
14 ': current sinusoidal ripple crossover point signal, computer just can calculate motor " bearing power sampling " numerical value according to itself and above information, as the control signal of controlling electricity-saving appliance star three conversion operations.
Star three change-over circuits of the present utility model are owing to there not being additive error, therefore be a kind of electricity-saving appliance that possesses high stability, so not only be applicable to rebuilding old equipment, more can dispatch from the factory by supporting new equipment, but can also become a kind of spread, there is high stability, cheap Universal electricity-saving device.
By the correction data examining report, can be found out, the middle low power motor application after star three change-over circuits of the present utility model, processing front and back current drain, power factor, all being significantly increased by aspects such as electric consumption, specific energy consumptions, obtained good technique effect.
Following table is that star three change-over circuits are applied to the correction data examining report on the Universal electricity-saving device of motor.
The testing result summary sheet
Certainly; the utility model can also have other various embodiments; in the situation that do not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (3)
1. a motor star/delta Universal electricity-saving device change-over circuit, described change-over circuit is connected with three phase electric machine, comprise control circuit and contactor, described contactor is connected with control circuit by transducer and/or sampler, it is characterized in that, the two ends cross-over connection of described three phase electric machine has the delta network contactor, three phase electric machine is equipped with the star circuit contactor away from an end of three phase mains, and described control circuit makes three phase electric machine switching Y-connection state or triangle connection status by adhesive or releasing contactor.
2. motor star/delta Universal electricity-saving device change-over circuit according to claim 1, it is characterized in that, described change-over circuit comprises power-supply filter, three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor, an end near three phase mains is equipped with A.C. contactor, described power-supply filter one end is connected with three phase mains, the other end is connected with power transformer, described power transformer is connected with the low tension switch power supply, and described three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor are connected with computer chip respectively.
3. motor star/delta Universal electricity-saving device change-over circuit according to claim 1 and 2, it is characterized in that, also comprise the motor temperature sampler, bearing power sampler, charactron display button plate, fault alarm relay, delta contactor, star contactor and the motor switch instruction that are connected in respectively computer chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201896900U CN203326948U (en) | 2013-04-16 | 2013-04-16 | Switching circuit of star-shaped / triangular general savor for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201896900U CN203326948U (en) | 2013-04-16 | 2013-04-16 | Switching circuit of star-shaped / triangular general savor for motor |
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| Publication Number | Publication Date |
|---|---|
| CN203326948U true CN203326948U (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201896900U Expired - Fee Related CN203326948U (en) | 2013-04-16 | 2013-04-16 | Switching circuit of star-shaped / triangular general savor for motor |
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| CN (1) | CN203326948U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219941A (en) * | 2013-04-16 | 2013-07-24 | 北京优尔特科技股份有限公司 | Switching circuit and switching method of star-shaped / triangular general savor for motor |
| CN104183178A (en) * | 2014-08-20 | 2014-12-03 | 张远镇 | Transformer analog device |
| CN104601079A (en) * | 2015-01-19 | 2015-05-06 | 东南大学 | Fault-tolerant control system and method for single-phase winding disconnection of electric vehicle driving system |
-
2013
- 2013-04-16 CN CN2013201896900U patent/CN203326948U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219941A (en) * | 2013-04-16 | 2013-07-24 | 北京优尔特科技股份有限公司 | Switching circuit and switching method of star-shaped / triangular general savor for motor |
| CN104183178A (en) * | 2014-08-20 | 2014-12-03 | 张远镇 | Transformer analog device |
| CN104601079A (en) * | 2015-01-19 | 2015-05-06 | 东南大学 | Fault-tolerant control system and method for single-phase winding disconnection of electric vehicle driving system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20180416 |