CN203481834U - Controlling apparatus for improving power factor of three-phase asynchronous alternating-current motor - Google Patents
Controlling apparatus for improving power factor of three-phase asynchronous alternating-current motor Download PDFInfo
- Publication number
- CN203481834U CN203481834U CN201320570807.XU CN201320570807U CN203481834U CN 203481834 U CN203481834 U CN 203481834U CN 201320570807 U CN201320570807 U CN 201320570807U CN 203481834 U CN203481834 U CN 203481834U
- Authority
- CN
- China
- Prior art keywords
- contactor
- asynchronous
- synchronous
- starting
- current
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Disclosed in the utility model is a controlling apparatus for improving a power factor of a three-phase asynchronous alternating-current motor. A direct current is injected into a rotor of a three-phase asynchronous alternating-current motor working normally to carry out excitation; the exciting current is changed to change a torque and a stator power factor of the motor; and when in an over-current state, the three-phase asynchronous alternating-current motor recovers to the asynchronous running state automatically and the running state indication is displayed. The control function is perfect; and the apparatus can be used conveniently. And the controlling apparatus is suitable for 90% of large-sized and middle-sized winding type three-phase asynchronous alternating-current motors. The controlling apparatus is composed of a first starting contactor, a second starting contactor, an asynchronous start button, a synchronous start button, a synchronous contactor, an asynchronous operation restore button, a current transformer, a current relay, an intermediate relay, an asynchronous signal lamp, a synchronous signal lamp, a starting rheostat and a direct-current excitation circuit.
Description
Technical field
The utility model relates to Induction Motor Control circuit, relates in particular to a kind of for improving the control device of the phase asynchronous alternating current motor power factor of Wound-rotor type.
Background technology
When the phase asynchronous alternating current motor of Wound-rotor type in network system adopts the phase asynchronous alternating current motor control loop starting of existing routine and operation, because the phase asynchronous alternating current motor of Wound-rotor type is inductive load, its stator presents the power factor of hysteresis, motor power (output) factor is low certainly will be caused and in system, exist a large amount of reactive powers and reactive current, cause the loss of circuit in network system and supply transformer to increase, also strengthened the input of reactive power compensating apparatus in network system simultaneously.Open day is on November 10th, 2004, publication number is that the patent documentation of CN2655501Y discloses such technical scheme, a kind of Winding asynchronous motor power factor compensating main circuit, it comprises transformer, fling-cut switch and DC excitation element circuit, DC excitation element circuit input is connected with transformer secondary, output is connected with one end of fling-cut switch, the other end of fling-cut switch is connected with the exit of the rotor coil of asynchronous motor, the former limit of transformer is connected with low-tension supply, there is main circuit simple, the advantages such as signals collecting and control are convenient, can realize the power factor compensation under underload.The weak point of this technical scheme is, when synchronous operation, when motor runs into excessive torque and step-out or while causing that because of reasons such as exciting current deficiencies stator current increases rapidly, cannot automatically return to asynchronous operation state, even may there is interruption of service, and the running status of motor switch convenient not, lack running status indication etc., control circuit is perfect not, uses inconvenient.
Summary of the invention
The utility model main purpose is to provide a kind of control device that improves phase asynchronous alternating current motor power factor, rotor injection direct current by the phase asynchronous alternating current motor to running well carries out excitation, by the rotor of the motor rotating speed that pulls in, by changing exciting current, change the stator power factor of torque and motor, when motor runs into excessive torque and step-out or while causing that because of reasons such as exciting current deficiencies stator current increases rapidly, automatically return to asynchronous operation state, and there is running status indication, running status easy switching.
The utility model is mainly solved by following technical proposals for prior art problem, a kind of control device that improves phase asynchronous alternating current motor power factor, comprise the first starting contactor, the second starting contactor, asynchronous starting button, synchronous initiation button, synchronous contactor, asynchronous operation recovery button, current transformer, current relay, auxiliary relay, asynchronous signal lamp, synchronous signal lamp, starting rheostat and DC excitation circuit, the main normal opened contact of the first starting contactor is serially connected in respectively three-phase alternating-current supply input, the main normal opened contact of the second starting contactor is serially connected in respectively between starting rheostat and the exit of rotor coil, the output of DC excitation circuit connects respectively the exit of rotor coil by the main normal opened contact of synchronous contactor, the input of DC excitation circuit is connected to three-phase alternating-current supply input, current transformer is arranged on the three-phase alternating-current supply input line of asynchronous motor and connects current relay, current relay one normal opened contact is serially connected in the electric power loop of auxiliary relay coil, asynchronous starting button is serially connected in the electric power loop of the first starting contactor coil, synchronous initiation button is the biswitch linkage structure of a normally closed switch and a normal open switch, normally closed switch and synchronous contactor one normally closed contact of the electric power loop serial connection synchronous initiation button of the second starting contactor coil, electric power loop serial connection auxiliary relay one normal opened contact of synchronous contactor coil, the second starting contactor one normally closed contact, the normal open switch of asynchronous operation recovery button and synchronous initiation button, asynchronous signal lamp is connected in series the auxiliary normal opened contact of the second starting contactor one, synchronous signal lamp is connected in series the auxiliary normal opened contact of synchronous contactor one.
This technical scheme, presses asynchronous starting button and makes the first starting contactor and the second starting contactor adhesive, and asynchronous motor starts asynchronous starting, excises gradually after starting resistance, and rotating speed rises thereupon.When asynchronous motor speed rises to while approaching synchronous speed, press synchronous initiation button and make the second starting contactor power-off, synchronous contactor adhesive, asynchronous motor rotor coil access DC excitation, by the asynchronous motor running status of pulling in, by regulating the output of DC excitation circuit to change the rotor excitation current of asynchronous motor, make the stator of asynchronous motor become capacity load, reach the power factor of automatic raising motor and the object of reactive power is provided to electrical network.The asynchronous motor in synchronous operation, recovers asynchronous operation state as wish, can press asynchronous operation recovery button, synchronous contactor power-off, and the second starting contactor adhesive, asynchronous motor reverts to asynchronous operation state.The asynchronous motor in synchronous operation, the step-out or while causing that because of reasons such as exciting current deficiencies stator current increases rapidly when running into excessive torque, current relay action, connect auxiliary relay, thereby disconnect the normal opened contact of synchronous contactor, connect the second starting contactor, asynchronous motor reverts to asynchronous operation state automatically.During asynchronous operation state, asynchronous signal lamp is lighted, and during synchronous operation, synchronous signal lamp is lighted.
As preferably, DC excitation circuit comprises rectifier transformer and semiconductor rectifier circuit, the input of rectifier transformer connects three-phase alternating-current supply input, the input of semiconductor rectifier circuit connects rectifier transformer output, and the output of semiconductor rectifier circuit connects respectively rotor coil exit by the main normal opened contact of synchronous contactor.
As preferably, rectifier transformer is output voltage capable of regulating convertor transformer.By regulating the mode of rectifier transformer output to change the rotor excitation current of asynchronous motor, make the stator of asynchronous motor become capacity load, reach the object that improves Asynchronous Motor Power Factor.
As preferably, the input of DC excitation circuit and the second starting contactor coil power, synchronous contactor coil power supply connect the output of the main normal opened contact of the first starting contactor, and the auxiliary normal opened contact of the first starting contactor one is serially connected in the total loop of the second starting contactor coil power and synchronous contactor coil power supply.To strengthen the fail safe of control circuit and the fail safe of operation.
The beneficial effect that the utility model brings is, rotor injection direct current by the phase asynchronous alternating current motor to running well carries out excitation, by the rotor of the asynchronous motor rotating speed that pulls in, and by changing exciting current, change the stator power factor of torque and motor, when motor runs into excessive torque and step-out or while causing that because of reasons such as exciting current deficiencies stator current increases rapidly, can automatically return to asynchronous operation state, and can between asynchronous operation state and synchronous operation state, carry out manual switchover at any time according to needs, running status shows by asynchronous signal lamp or synchronous signal lamp, this device is controlled perfect in shape and function, very easy to use, is applicable to average load torque and is no more than 80% of rated value, and peak load torque is no more than 90% the phase asynchronous alternating current motor of large and medium-sized Wound-rotor type of rated value.
Accompanying drawing explanation
Fig. 1 is a kind of circuit theory diagrams of the present utility model.
In figure: the 1st, DC excitation circuit, the 2nd, rectification circuit, the 3rd, asynchronous motor, KM1 is the first starting contactor, KM2 is the second starting contactor, KM3 is synchronous contactor, SB1 is asynchronous starting button, SB2 is synchronous initiation button, SB3 is stop botton, SB4 is asynchronous operation recovery button, TA is current transformer, KA is current relay, K is auxiliary relay, KD1 is asynchronous signal lamp, KD2 is synchronous signal lamp, R is starting rheostat, TV is rectifier transformer, S1 is the first limit switch, S2 is the second limit switch, 1QF is the first circuit breaker, 2QF is the second circuit breaker.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is further described in detail.
Embodiment: as shown in Figure 1, the utility model is a kind of control device that improves phase asynchronous alternating current motor power factor.The first limit switch S1 and the second limit switch S2 are set on the operating grip of starting rheostat R; The main normal opened contact KM1a-c of the first starting contactor KM1 is serially connected in respectively three-phase alternating-current supply L1L2L3 input, DC excitation circuit 1 consists of the adjustable rectifier transformer TV of output voltage and semiconductor rectifier circuit 2, and the power supply of the power supply of the input of DC excitation circuit 1 and the second starting contactor KM2 coil, synchronous contactor KM3 coil is connected to main normal opened contact KM1a-c output; the main normal opened contact KM2a-c of the second starting contactor KM2 is serially connected in respectively between starting rheostat R and the exit of rotor coil, the output of DC excitation circuit 1 connects respectively the exit of rotor coil by the main normal opened contact KM3a-c of synchronous contactor KM3, the input of DC excitation circuit 1 is connected to main normal opened contact KM1a-c output, current transformer TA is arranged on the three-phase alternating-current supply L1L2L3 lead-in (a wherein phase) of asynchronous motor 3 and connects current relay KA, current relay KA normal opened contact KA-1 is serially connected in the electric power loop of the coil of auxiliary relay K, asynchronous starting button SB1 and the first limit switch S1 are serially connected in the electric power loop of the first starting contactor KM1 coil, synchronous initiation button SB2 adopts the biswitch linkage structure of a normally closed switch and a normal open switch, normally closed switch and the synchronous contactor KM3 normally closed contact KM3d of the electric power loop serial connection synchronous initiation button SB2 of the second starting contactor KM2 coil, the normal opened contact K-1 of the electric power loop serial connection auxiliary relay K of synchronous contactor KM3 coil, the normally closed contact KM2d of the second starting contactor KM2, asynchronous operation recovery button SB4, the normal open switch of synchronous initiation button SB2 and the second limit switch S2, asynchronous signal lamp KD1 is connected in series the auxiliary normal opened contact KM2e of the second starting contactor KM2, synchronous signal lamp KD2 is connected in series the auxiliary normal opened contact KM3f of synchronous contactor KM3.The auxiliary normal opened contact KM1e of the first starting contactor KM1 is serially connected in the total loop of the second starting contactor KM2 coil power and synchronous contactor KM3 coil power.
As circuit breaker 1QF, the 2QF of closing, limit switch S1 and S2 on operation starting rheostat operating grip, when the resistance total head of the starting rheostat R connecting at rotor accesses, the first limit switch S1 connects dynamic circuit breaker contact, for the asynchronous starting of asynchronous motor 3 is prepared; Press SB1 and make contactor KM1 and KM2 adhesive, asynchronous motor 3 starts asynchronous starting; Excise gradually starting resistance, rotating speed rises thereupon; When in three-phase, starting resistance equals 0, the second limit switch S2 action is connected normally opened contact, for contactor KM3 energising is got ready; When asynchronous motor 3 rise of rotational speed are when approaching synchronous speed, press SB2 and make contactor KM2 power-off, KM3 adhesive, asynchronous motor 3 rotor coils access DC excitation, asynchronous motor 3 operation of pulling in; By regulating the output of rectifier transformer TV to change the rotor excitation current of asynchronous motor 3, make the stator of motor become capacity load, reach the power factor object of automatic raising motor, and provide reactive power to electrical network.The asynchronous motor in synchronous operation 3, recovers asynchronous operation as wish, can press SB4 button, contactor KM3 power-off, and KM2 adhesive, asynchronous motor 3 recovers asynchronous operation state.The asynchronous motor in synchronous operation 3, when motor runs into excessive torque and step-out or while causing that because of reasons such as exciting current deficiencies stator current increases rapidly, current relay KA action, connect auxiliary relay K, thereby disconnect contactor KM3 coil power, the normally closed contact KM3d of contactor KM3 connects contactor KM2 coil power, and asynchronous motor 3 returns to asynchronous operation state automatically; Asynchronous signal lamp KD1 lights when asynchronous operation state, and synchronous signal lamp KD2 lights when synchronous operation state.
Claims (4)
1. a control device that improves phase asynchronous alternating current motor power factor, it is characterized in that: comprise the first starting contactor (KM1), the second starting contactor (KM2), asynchronous starting button (SB1), synchronous initiation button (SB2), synchronous contactor (KM3), asynchronous operation recovery button (SB4), current transformer (TA), current relay (KA), auxiliary relay (K), asynchronous signal lamp (KD1), synchronous signal lamp (KD2), starting rheostat (R) and DC excitation circuit, the main normal opened contact of described the first starting contactor (KM1) (KM1a-c) is serially connected in respectively three-phase alternating-current supply (L1, L2, L3) input, the main normal opened contact of the second starting contactor (KM2) (KM2a-c) is serially connected in respectively between starting rheostat (R) and the exit of rotor coil, the output of DC excitation circuit connects respectively the exit of rotor coil by the main normal opened contact of synchronous contactor (KM3) (KM3a-c), the input of DC excitation circuit is connected to three-phase alternating-current supply (L1, L2, L3) input, current transformer (TA) is arranged on the three-phase alternating-current supply (L1 of asynchronous motor, L2, L3) input line and connection current relay (KA), current relay (KA) normal opened contact is serially connected in the electric power loop of auxiliary relay (K) coil, asynchronous starting button (SB1) is serially connected in the electric power loop of the first starting contactor (KM1) coil, synchronous initiation button (SB2) is the biswitch linkage structure of a normally closed switch and a normal open switch, the normally closed switch of the electric power loop serial connection synchronous initiation button (SB2) of the second starting contactor (KM2) coil and synchronous contactor (KM3) normally closed contact, electric power loop serial connection auxiliary relay (K) normal opened contact of synchronous contactor (KM3) coil, the second starting contactor (KM2) normally closed contact, the normal open switch of asynchronous operation recovery button (SB4) and synchronous initiation button (SB2), asynchronous signal lamp is connected in series the auxiliary normal opened contact of the second starting contactor (KM2), synchronous signal lamp is connected in series the auxiliary normal opened contact of synchronous contactor (KM3).
2. a kind of control device that improves phase asynchronous alternating current motor power factor according to claim 1, it is characterized in that: described DC excitation circuit comprises rectifier transformer and semiconductor rectifier circuit, the input of described rectifier transformer connects three-phase alternating-current supply (L1, L2, L3) input, the input of described semiconductor rectifier circuit connects rectifier transformer output, and the output of semiconductor rectifier circuit connects respectively rotor coil exit by the main normal opened contact of synchronous contactor (KM3) (KM3a-c).
3. a kind of control device that improves phase asynchronous alternating current motor power factor according to claim 2, is characterized in that: described rectifier transformer is output voltage capable of regulating convertor transformer.
4. a kind of control device that improves phase asynchronous alternating current motor power factor according to claim 1, it is characterized in that: described DC excitation circuit input and the second starting contactor (KM2) coil power, synchronous contactor (KM3) coil power connect the output of the main normal opened contact of described the first starting contactor (KM1) (KM1a-c), the auxiliary normal opened contact (KM1e) of the first starting contactor (KM1) is serially connected in the total loop of the second starting contactor (KM2) coil power and synchronous contactor (KM3) coil power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320570807.XU CN203481834U (en) | 2013-09-16 | 2013-09-16 | Controlling apparatus for improving power factor of three-phase asynchronous alternating-current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320570807.XU CN203481834U (en) | 2013-09-16 | 2013-09-16 | Controlling apparatus for improving power factor of three-phase asynchronous alternating-current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203481834U true CN203481834U (en) | 2014-03-12 |
Family
ID=50230089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320570807.XU Expired - Fee Related CN203481834U (en) | 2013-09-16 | 2013-09-16 | Controlling apparatus for improving power factor of three-phase asynchronous alternating-current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203481834U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529966A (en) * | 2014-09-29 | 2016-04-27 | 株洲变流技术国家工程研究中心有限公司 | Method of asynchronously starting electrically-excited synchronous motor by frequency converter |
| CN106787555A (en) * | 2016-12-26 | 2017-05-31 | 天津英利新能源有限公司 | A kind of method and device of threephase asynchronous dehumidifying |
-
2013
- 2013-09-16 CN CN201320570807.XU patent/CN203481834U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529966A (en) * | 2014-09-29 | 2016-04-27 | 株洲变流技术国家工程研究中心有限公司 | Method of asynchronously starting electrically-excited synchronous motor by frequency converter |
| CN105529966B (en) * | 2014-09-29 | 2019-04-16 | 株洲变流技术国家工程研究中心有限公司 | A kind of method of frequency converter asynchronous starting electric excitation synchronous motor |
| CN106787555A (en) * | 2016-12-26 | 2017-05-31 | 天津英利新能源有限公司 | A kind of method and device of threephase asynchronous dehumidifying |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204205599U (en) | A kind of electronic type feeder line on-load voltage regulating device | |
| CN103647458B (en) | Frequency conversion system and carry out the method and apparatus of precharge to the high voltage converter in it | |
| CN203166759U (en) | A soft starting circuit of a converter power loop circuit | |
| CN101383590B (en) | Dragging device with high starting performance induction motor and frequency transformer cooperatively running | |
| CN105391356A (en) | Starting control system and method of brushless double-fed motor | |
| CN202034781U (en) | Chopped-mode reactive power continuous compensation device | |
| CN203406794U (en) | Large power distributed energy storage current transformer | |
| CN203481834U (en) | Controlling apparatus for improving power factor of three-phase asynchronous alternating-current motor | |
| CN203057040U (en) | Discrete frequency-conversion soft starting device with no speed sensor | |
| CN105471339B (en) | A kind of asynchronous starting device of brushless double-fed motor | |
| CN202565218U (en) | Automatic control frequency conversion soft start device of medium-high voltage synchronous motor | |
| CN201690400U (en) | Frequency-conversion soft-start hybrid power cabinet | |
| CN106899241B (en) | Brushless doubly-fed motor starting control device and method | |
| CN201533269U (en) | Double-speed single-phase alternating current motor | |
| CN202059356U (en) | Motor frequency conversion soft starter | |
| CN205265572U (en) | Brushless double -fed motor's supplementary asynchronous soft start structure and asynchronous soft start structure | |
| CN203883721U (en) | Oil pumping machine self-starting permanent magnet synchronous motor compensating type voltage regulator | |
| CN203911835U (en) | Stringing type motor vehicle-used frequency converter | |
| CN201910765U (en) | Energy-saving starting control circuit of asynchronous motor | |
| CN206313696U (en) | A kind of general motor control device based on double-closed-loop control | |
| CN204669268U (en) | Three-power motor conversion equipment | |
| CN204131130U (en) | A kind of battery saving arrangement based on intelligent AC electrical network | |
| CN2563831Y (en) | Magnetic control soft startor for medium and high voltage large power AC motor | |
| CN203859712U (en) | Internal compensation speed-regulating type wound rotor asynchronous motor | |
| CN215010101U (en) | Intelligent drawer type pressure regulating starting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20140312 Termination date: 20170916 |