CN103219941A - Switching circuit and switching method of star-shaped / triangular general savor for motor - Google Patents
Switching circuit and switching method of star-shaped / triangular general savor for motor Download PDFInfo
- Publication number
- CN103219941A CN103219941A CN2013101304512A CN201310130451A CN103219941A CN 103219941 A CN103219941 A CN 103219941A CN 2013101304512 A CN2013101304512 A CN 2013101304512A CN 201310130451 A CN201310130451 A CN 201310130451A CN 103219941 A CN103219941 A CN 103219941A
- Authority
- CN
- China
- Prior art keywords
- motor
- star
- phase
- contactor
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a star-shaped/ triangular switching circuit for a small-and-medium powered motor and a star-shaped / triangular switching method. 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. The switching method comprises the following steps: confirming a rated power and a rated current and conducting inspection work; 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, is quite stable and cheap.
Description
Technical field
The present invention relates to a kind of change-over circuit, especially relate to a kind of motor star/delta universal electricity-saving device change-over circuit, the invention still further relates to a kind of conversion method of motor star/delta universal electricity-saving device.
Background technology
1), star three conversion if the domestic existing electricity-saving appliance is 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 of domestic research and development over 40 years three conversion electricity-saving appliances or reactor voltage-regulating and electricity-saving device, always use " motor current sampling method " control signal existing problems: as conversion.Seem the simplest and the most direct, actual infeasible.Because only the electric current amplitude of variation that causes of ambient voltage 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 the disturbance.2), " the frequency converter voltage-regulating and electricity-saving device " of domestic research and development or " silicon-controlled voltage regulation electricity-saving appliance " over past ten years, more use " power factor sampling method ".The same power factor change that causes because of ambient voltage is also bigger, and power factor is also bigger because of the dispersion of 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.When the disturbance that 380V voltage fluctuates between 340V-420V, ambient voltage causes of facility environment power supply near useful signal itself; But more much better than the 1st kind of method " sampling motor current ", because signal amplitude is less than perturbation amplitude.Above sampling mode, owing to there is bigger environmental perturbation, every machine all must be sent the technical staff to carry out field adjustable and just can come into operation at the rebuilding old equipment scene.So large tracts of land is promoted and all is so limited, and can't become a kind of universal product that dispatches from the factory and can directly use.
Summary of the invention
The object of the present invention 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 are not other additive errors, reflect the real-time bearing power size of motor very accurately, and then accurately controlled star three conversion power-saving runnings.
The present invention adopts following technical scheme to realize:
A kind of motor star/delta universal electricity-saving device change-over circuit, described change-over circuit links to each other with three phase electric machine, comprise control circuit and contactor, described contactor links to each other 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 switch Y-connection state or triangle connection status by adhesive or release contactor.
Further, described change-over circuit comprises power-supply filter, three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor, end near three phase mains is equipped with A.C. contactor, described power-supply filter one end links to each other with three phase mains, the other end links to each other with power transformer, described power transformer links to each other with the low tension switch power supply, and described three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor link to each other 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 computer chip respectively.
A kind of motor star/delta universal electricity-saving device conversion method is characterized in that this conversion method comprises the steps:
When 1) moving the star/delta change-over circuit for the first time, input rated power and rated current;
2) change-over circuit is patrolled and examined work according to rated power and rated current, 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; This moment, bearing power was zero, so control circuit output star contactor KMY signal, adhesive A.C. contactor KMY, motor are in the standby condition of star running;
3) if three-phase phase-sequence negative phase sequence, three-phase electricity phase shortage take place, supply power voltage is too high, supply power voltage is low excessively, 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 measures the real-time bearing power size of motor, if load exceeds " on jump the triangle line of demarcation ", promptly discharge " star contactor KMY ", adhesive " delta contactor KM Δ ", make motor be in the triangle running status;
Or:
If load is lower than " jumping the star line of demarcation down ", discharges " delta contactor KM Δ ", adhesive " star contactor KMY " immediately, make motor be in the star running status.
Further, in step 4), 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, after finishing, step 4) also comprises a step 5): after the motor switch instruction cancellation, 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 invention are not owing to exist 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 that a kind of large tracts of land is promoted, have high stability, a cheap universal electricity-saving device.
Description of drawings
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.
Fig. 3 is that star three change-over circuits are applied to the correction data examining report on the universal electricity-saving device of motor.
Embodiment
By following description to embodiment; to help public understanding the present invention more; but can't the specific embodiment that the applicant is given be considered as restriction to technical solution of the present invention, any definition to parts or technical characterictic change and/or to overall structure do form but not the conversion of essence all should be considered as the protection range that technical scheme of the present invention limits.
Motor star/delta universal electricity-saving device change-over circuit of the present invention as shown in Figure 1, change-over circuit links to each other with three phase electric machine, comprise control circuit and contactor, contactor links to each other 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 switch Y-connection state or triangle connection status by adhesive or release contactor.Change-over circuit comprises power-supply filter, three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor, end near described three phase mains is equipped with A.C. contactor, power-supply filter one end links to each other with three phase mains, the other end links to each other with power transformer, power transformer links to each other with the low tension switch power supply, and three phase sequence transducers, three-phase voltage sampler and motor current sensor link to each other with computer chip respectively.
Comprise also in the 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:
When 1) moving the star/delta change-over circuit for the first time, input rated power and rated current;
2) change-over circuit is patrolled and examined work according to rated power and rated current, 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; This moment, bearing power was zero, so control circuit output star contactor KMY signal, adhesive A.C. contactor KMY, motor are in the standby condition of star running;
3) if three-phase phase-sequence negative phase sequence, three-phase electricity phase shortage take place, supply power voltage is too high, supply power voltage is low excessively, 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 measures the real-time bearing power size of motor, if load exceeds " on jump the triangle line of demarcation ", promptly discharge " star contactor KMY ", adhesive " delta contactor KM Δ ", make motor be in the triangle running status;
Or:
If load is lower than " jumping the star line of demarcation down ", discharges " delta contactor KM Δ ", adhesive " star contactor KMY " immediately, make motor be in the star running status.
In step 4), charactron shows every service datas such as motor current, bearing power, star three condition always, as long as a 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.
After finishing, step 4) also comprises a step 5): after the motor switch instruction cancellation, 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, again through low tension switch power supply output+5V ,-the integrated circuit electricity consumption of two kinds of power supplys supply computer chips of 5V and Ge Lu I/O channel.+ 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 A.C. contactor power supply.After the computer chip energising, as long as equipment manufacturers are before operation for the first time, go up " rated power ", " rated current " binomial data of demarcating on this equipment motor nameplate of input in " charactron display button plate ", chip will access all operation monitoring data of this specification motor automatically in the scope of 4.0-150kw, ever since by this data run.Before obtaining the motor switch instruction, chip just begins 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 electricity phase shortage take place, supply power voltage is too high, supply power voltage is low excessively, motor temperature is crossed high fault, all can show failure code and No starting motor at charactron.Therefore " bearing power sampling " is zero the time, so computer output " star contactor KMY " signal, adhesive A.C. contactor KMY, motor are in the standby condition of star running.When the operative employee provides " motor switch instruction ", this instructs direct adhesive A.C. contactor KMZ; Therefore be in star running standby condition before, promptly implemented start-up course after the motor energising, relied on computer chip " electric motor starting is finished identification software ", motor is in star-like state before startup is finished always by star.Finish in case identify motor starting, the very first time is dropped into " power-saving running monitor state ", makes sensitive reaction with operating mode that the load that takes place is at any time uprushed.
In the motor operation, " bearing power sampling " software is constantly measured the real-time bearing power size of motor, in case load exceeds " on jump the triangle line of demarcation ", discharge " star contactor KMY ", adhesive " delta contactor KM Δ " immediately, make motor be in the triangle running status.Otherwise,, discharge " delta contactor KM Δ ", adhesive " star contactor KMY " immediately, make motor be in the star running status if load is lower than " jumping the star line of demarcation down ".Charactron shows every service datas such as motor current, bearing power, star three condition always in this process.
" 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 " cancellation, chip recovers to patrol and examine " three-phase phase-sequence transducer ", " three-phase voltage sampling ", " motor temperature sampling ", " bearing power sampling ", reaches every data or the like of patrolling and examining of demonstration on charactron.Simultaneously, wait for the arrival of next round " motor switch instruction ".
Explanation of nouns:
Last jumping triangle line of demarcation: constant transform and its application in electromotor load power numerical value of given computer, when motor operated in star-like state, less than this numerical value, motor was kept the star running status always as if motor real time execution power.If motor real time execution power is greater than this numerical value, computer just instructs the star A.C. contactor to switch to the triangle A.C. contactor, and motor runs on the triangle state.This constant bearing power numerical value is called " on jump the triangle line of demarcation ".
Jump the star line of demarcation down: constant transform and its application in electromotor load power numerical value of given computer, when motor operated in the triangle state, greater than this numerical value, motor was kept the triangle running status always as if motor real time execution power.If motor real time execution power is less than this numerical value, computer just instructs the triangle A.C. contactor to switch to the star A.C. contactor, and motor runs on the star state.This constant bearing power numerical value is called " jumping the star line of demarcation down ".These two line of demarcation numerical value are different.
Technical scheme of the present invention by A.C. contactor (KMZ, KM Δ, KMY) be main constitute the basic forceful electric power circuit of star three conversions, be that core is formed basic telemetry circuit with the computer chip.Telemetry circuit is made up 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 Δ, 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 the 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; Be suitable for 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.This machine need not divide concrete specification, a machine general on earth, have a very strong versatility.The present invention has comprehensive electric motor protecting function, takes a sample only with one road T--T ' path it " motor current sensor " at the three-phase current of forceful electric power circuit.And in the past the conventional current sample circuit of motor 2--3 road current sensor need be set can; If only establish 1 the tunnel, can't tackle when string has the circuit generation open circuit fault of current transformer.The present invention understands this road motor current signal of multianalysis, and for example string has the circuit of current transformer above-mentioned open circuit fault to take place with break signal is broken " fault alarm relay " according to this, the protection motor is not damaged.
Circuit theory diagrams of the present invention as shown in Figure 2, the function of schematic diagram: the one, computer port U3 is adjusted afterwards, is sent to sampling " voltage signal input " signal that " three-phase voltage transducer " sent here through operational amplifier U1A, the 2nd, " current signal input " signal that " motor current sensor " sent here is sent to " harmonic filter " that operational amplifier U2A constitutes after adjusting through operational amplifier U1B.Because motor current influence of harmonic, current waveform always are the swinging back and forth of half period along with the synergistic effect of harmonic wave presents 3-5 about second, this current waveform that swings 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 this pure current sinusoidal ripple " phase comparator " shaping, obtain the square wave of current sinusoidal ripple zero crossing, as sending into computer port I4 ' with respect to the sinusoidal wave power-factor angle that lags behind of voltage through operational amplifier U2B composition." electric current second operational amplifier " that pure current sinusoidal ripple signal I2 ' sends into computer port I2 ' simultaneously and constitutes through operational amplifier U3A once more, this current signal is sent into computer port I3 '.
Computer port relies on the following information that obtains:
U3: voltage sine wave signal, computer further are treated to sinusoidal wave effective value of voltage and voltage over zero phase reference signal.
I2 ': the first current sinusoidal ripple signal, computer further are treated to the required electric current alarm signal of this machine.Motor " rated power " and " rated current " binomial data imported for the first time according to equipment manufacturers, from numerous ratings of electric machine of 4.0-150kw scope, access this motor operation warning basic parameter of storage, just can constantly compare, determine whether report to the police with this current sinusoidal ripple signal.
I3 ': the second current sinusoidal ripple signal, Computer Processing are the meticulous sinusoidal wave effective value of motor current.
I4 ': 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 control electricity-saving appliance star three conversion operations.
Star three change-over circuits of the present invention are not owing to exist 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 that a kind of large tracts of land is promoted, have high stability, a cheap universal electricity-saving device.
Measure " the correction data examining report " of power saving rate as shown in Figure 3, by correction data as can be seen, the middle low power motor application after star three change-over circuits of the present invention, processing front and back current drain, power factor, all being significantly increased, obtained the good technical effect with aspects such as electric consumption, specific energy consumptions.
Certainly; the present invention can also have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (6)
1. motor star/delta universal electricity-saving device change-over circuit, described change-over circuit links to each other with three phase electric machine, comprise control circuit and contactor, described contactor links to each other 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 switch Y-connection state or triangle connection status by adhesive or release 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, end near three phase mains is equipped with A.C. contactor, described power-supply filter one end links to each other with three phase mains, the other end links to each other with power transformer, described power transformer links to each other with the low tension switch power supply, and described three-phase phase-sequence transducer, three-phase voltage sampler and motor current sensor link to each other 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 computer chip respectively.
4. a motor star/delta universal electricity-saving device conversion method is characterized in that this conversion method comprises the steps:
When 1) moving the star/delta change-over circuit for the first time, input rated power and rated current;
2) change-over circuit is patrolled and examined work according to rated power and rated current, 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; This moment, bearing power was zero, so control circuit output star contactor KMY signal, adhesive A.C. contactor KMY, motor are in the standby condition of star running;
3) if three-phase phase-sequence negative phase sequence, three-phase electricity phase shortage take place, supply power voltage is too high, supply power voltage is low excessively, 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 measures the real-time bearing power size of motor, if load exceeds " on jump the triangle line of demarcation ", promptly discharge " star contactor KMY ", adhesive " delta contactor KM Δ ", make motor be in the triangle running status;
Or:
If load is lower than " jumping the star line of demarcation down ", discharges " delta contactor KM Δ ", adhesive " star contactor KMY " immediately, make motor be in the star running status.
5. motor star/delta universal electricity-saving device conversion method according to claim 4, it is characterized in that, in step 4), 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.
6. according to claim 4 or 5 described motor star/delta universal electricity-saving device conversion methods, it is characterized in that, after finishing, step 4) also comprises a step 5): after the motor switch instruction cancellation, 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 ".
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101304512A CN103219941A (en) | 2013-04-16 | 2013-04-16 | Switching circuit and switching method of star-shaped / triangular general savor for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101304512A CN103219941A (en) | 2013-04-16 | 2013-04-16 | Switching circuit and switching method of star-shaped / triangular general savor for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103219941A true CN103219941A (en) | 2013-07-24 |
Family
ID=48817497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101304512A Pending CN103219941A (en) | 2013-04-16 | 2013-04-16 | Switching circuit and switching method of star-shaped / triangular general savor for motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103219941A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928932A (en) * | 2014-04-30 | 2014-07-16 | 海尔海斯(西安)控制技术有限公司 | Low-voltage on-load voltage regulation device |
| CN104638941A (en) * | 2014-06-11 | 2015-05-20 | 襄阳南车电气***技术有限公司 | Large-capacity anti-explosion frequency converter applicable to multiple output voltage levels |
| WO2018167342A1 (en) * | 2017-03-16 | 2018-09-20 | Tizona Motors Sl | Motor-drive system for electric vehicles |
| CN110915130A (en) * | 2017-07-07 | 2020-03-24 | 三菱电机株式会社 | Motor drive system and air conditioner |
| CN111478642A (en) * | 2020-04-16 | 2020-07-31 | 广州华凌制冷设备有限公司 | Drive control circuit, drive control method, circuit board and air conditioner |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201122928Y (en) * | 2007-11-09 | 2008-09-24 | 左松波 | Star-delta automatic switching energy-saving distributor of oil well motor |
| CN102412765A (en) * | 2011-11-18 | 2012-04-11 | 华北电力大学 | Three-phase motor winding star-to-angle soft switching semi-solid controlling device and control method thereof |
| CN102811018A (en) * | 2011-06-03 | 2012-12-05 | 西门子公司 | Asynchronous motor adopting star connection or delta connection related to load |
| CN203326948U (en) * | 2013-04-16 | 2013-12-04 | 北京优尔特科技股份有限公司 | Switching circuit of star-shaped / triangular general savor for motor |
-
2013
- 2013-04-16 CN CN2013101304512A patent/CN103219941A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201122928Y (en) * | 2007-11-09 | 2008-09-24 | 左松波 | Star-delta automatic switching energy-saving distributor of oil well motor |
| CN102811018A (en) * | 2011-06-03 | 2012-12-05 | 西门子公司 | Asynchronous motor adopting star connection or delta connection related to load |
| CN102412765A (en) * | 2011-11-18 | 2012-04-11 | 华北电力大学 | Three-phase motor winding star-to-angle soft switching semi-solid controlling device and control method thereof |
| CN203326948U (en) * | 2013-04-16 | 2013-12-04 | 北京优尔特科技股份有限公司 | Switching circuit of star-shaped / triangular general savor for motor |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928932A (en) * | 2014-04-30 | 2014-07-16 | 海尔海斯(西安)控制技术有限公司 | Low-voltage on-load voltage regulation device |
| CN104638941A (en) * | 2014-06-11 | 2015-05-20 | 襄阳南车电气***技术有限公司 | Large-capacity anti-explosion frequency converter applicable to multiple output voltage levels |
| WO2018167342A1 (en) * | 2017-03-16 | 2018-09-20 | Tizona Motors Sl | Motor-drive system for electric vehicles |
| CN110915130A (en) * | 2017-07-07 | 2020-03-24 | 三菱电机株式会社 | Motor drive system and air conditioner |
| CN110915130B (en) * | 2017-07-07 | 2023-12-08 | 三菱电机株式会社 | Motor driving system and air conditioner |
| CN111478642A (en) * | 2020-04-16 | 2020-07-31 | 广州华凌制冷设备有限公司 | Drive control circuit, drive control method, circuit board and air conditioner |
| CN111478642B (en) * | 2020-04-16 | 2022-03-01 | 广州华凌制冷设备有限公司 | Drive control circuit, drive control method, circuit board and air conditioner |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104219315B (en) | A kind of operation monitoring system of power information acquisition system and method for supervising thereof | |
| JP5452613B2 (en) | Power grid supply interruption and failure status management | |
| CN102437650B (en) | Intelligent electric power distribution system | |
| CN103219941A (en) | Switching circuit and switching method of star-shaped / triangular general savor for motor | |
| CN103187735B (en) | Bidirectional intelligent gateway device for distributed new energy grid connection | |
| CN103092169B (en) | Digital camp apparatus management/control device | |
| CN102967758A (en) | Separating method for indirect subentry measurement of building energy consumption | |
| CN101764550A (en) | Integrated protection controller for wireless intelligent motor | |
| CN103323686B (en) | A kind of intelligent grid power quality analyzer | |
| CN203326948U (en) | Switching circuit of star-shaped / triangular general savor for motor | |
| CN103592531A (en) | Method and system for detecting parameters of wind power plant static var generator | |
| CN203800700U (en) | Power distribution network monitoring system | |
| CN102890247A (en) | Testing system of uninterruptible power supply and testing method thereof | |
| CN114660412A (en) | Electric energy quality monitoring system based on intelligent electric energy meter and monitoring method thereof | |
| CN208314090U (en) | A kind of test device for Active Power Filter-APF | |
| CN113890013A (en) | Method and system for automatically identifying low-voltage line topology by utilizing network terminal power failure data | |
| CN104979905A (en) | Monitor information access automatic identification diagnosis method | |
| CN202093088U (en) | Electrical parameter measuring device | |
| CN102707174B (en) | Detection system and method of operation state of resistor type superconductive current limiter | |
| CN203101506U (en) | Three-phase digital smart meter | |
| CN202276135U (en) | Comprehensive protection controller for wireless intelligent motor | |
| CN204696691U (en) | A kind of modular harmonic wave control and reactive power compensator | |
| CN203232270U (en) | Automatic restart system of electrical energy collection terminal of transformer station | |
| CN201750220U (en) | Smart terminal for power distribution measurement and control | |
| CN202524168U (en) | Power quality data monitoring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20130724 |