CN201142654Y - Star triangular decompression starter circuit of three phase asynchronous motor - Google Patents
Star triangular decompression starter circuit of three phase asynchronous motor Download PDFInfo
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- CN201142654Y CN201142654Y CNU2007203106183U CN200720310618U CN201142654Y CN 201142654 Y CN201142654 Y CN 201142654Y CN U2007203106183 U CNU2007203106183 U CN U2007203106183U CN 200720310618 U CN200720310618 U CN 200720310618U CN 201142654 Y CN201142654 Y CN 201142654Y
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Abstract
The utility model relates to a star delta reduced-voltage starting circuit of a three-phase asynchronous motor for using the control of a single-chip microcomputer to carry out the loss-of-phase detection, which can solve the shortcoming that a contactor easily causes arc short circuit or serious burning damage to a contact point and the problems of direct delta start, star operation, no indicating signals and so on; a control circuit thereof comprises the single-chip microcomputer which is connected with an input circuit and an output circuit, a drive circuit, a display circuit and a contact coil; the output circuit is connected with the drive circuit and the display circuit by photoelectric isolation, and the contact coil is further connected with the drive circuit. The power factor of the motor is compensated to more than 0.9, when a power supply has the loss of phase, the star delta reduced-voltage starting circuit can realize the instantaneous protection of the loss-of-phase of the power supply, thus conveniently realizing the 4-section delay control and ensuring the safety of the contact point of the star contactor after extinguishing the arc for cutting off the power supply of the main contact point of the contactor of the power supply.
Description
Technical field
The utility model relates to a kind of threephase asynchronous start control circuit, especially can carry out the threephase asynchronous star triangle reduced voltage starting circuit that phase shortage detects with Single-chip Controlling.
Background technology
At present, during more powerful motor (tens to hundreds of kilowatt) direct-on-line starting, the electric current (5～7 times rated current) that starting produces can make distribution system voltage descend and influence illumination and equipment operate as normal thereof, in addition, the accelerating torque that produces during the motor direct-on-line starting can cause bigger impact to the plant equipment that drags.Therefore, in actual engineering, all adopt the reduced voltage starting mode, to reduce starting current and starting torque than high power motor.
Adopt the Y-Δ reduced voltage starting of traditional relay-contactor, starting current is reduced to direct-on-line starting 1/3, and starting torque is also reduced to 1/3 of direct-on-line starting, and is little to the electrical network impact, little to the mechanical shock of equipment.
During the conversion of Y-Δ, the disjunction of star contactor main contacts be the decay starting current, this electric current is often big than rated current, when Y shape is played trend Δ operation conversion, be that the electric current of star contactor is selected obviously less than normal by star contactor disjunction starting starting current, control circuit starts starting current by disjunction, connect delta contactor KM2 when star contactor KM3 disconnects, easily cause the serious scaling loss in arc short-circuit or contact.
Relay-contactor control Y-Δ reduced voltage starting circuit connection complexity, maintenance is inconvenient, and this control circuit also exists direct triangle starting, star to move, do not have problems such as indication signal simultaneously.
Summary of the invention
The utility model has solved the above-mentioned shortcoming that exists in the prior art; a kind of band local compensation is provided; can improve the power of electric motor factor; deixis is set in circuit; be convenient to operation; the circuit phase failure, contactor melting welding, contactor card gram fault alarm function are set, are convenient to maintenance circuit, the star triangle reduced voltage starting circuit of phase failure instantaneous operation protection
The technical scheme that its technical problem that solves the utility model adopts is: a kind of threephase asynchronous star triangle reduced voltage starting circuit, the main circuit and the control circuit that comprise threephase asynchronous, wherein, described control circuit comprises the single-chip microcomputer that is connected with input circuit and output circuit, drive circuit, display circuit with contact coil; Isolation links to each other with drive circuit, display circuit described output circuit through photoelectricity, and the contact coil links to each other with drive circuit again.Adopt Single-chip Controlling, can realize 4 sections time-delay controls easily: the first time and the 4th time-delay 5ms, can avoid because of power contactor and star contactor, power contactor and delta contactor simultaneously electric, the main contacts of power contactor and star contactor, power contactor and delta contactor is shaken when closure and is caused burning of contact; The 10S that delays time for the second time is the time of star starting, can accurately regulate easily; The 30ms that delays time for the third time, can guarantee the arc extinction of power contactor main contacts deenergization after the star contactor just disconnect.
Input circuit comprises enabling signal input, stop signal input, the input of hot guard signal and contacts the input of coil feedback signal.
Display circuit is by diode displaying star initiating signal, triangle run signal and alarm signal.
Input circuit also comprises the input of phase shortage detection signal, and affiliated phase shortage detection signal input signal provides signal by lack detection circuit.
Lack detection circuit comprises the local compensation circuit, current rectifying and wave filtering circuit and voltage stabilizing circuit.The local compensation circuit can selectivity be installed; The local compensation circuit comprises building-out capacitor, the power of electric motor factor can be compensated to more than 0.9, when the power supply generation phase failure, produces potential difference between the contact point of contactor and the neutral point, realizes the moving protection of wink of the power supply phase failure
Single-chip microcomputer also selects control circuit to link to each other with the starting time.
The beneficial effects of the utility model are: the power of electric motor factor can be compensated to more than 0.9 by the local compensation circuit, when the power supply generation phase failure, realize the moving protection of wink of the power supply phase failure; Adopt Single-chip Controlling, can realize 4 sections time-delay controls easily, guarantee the safety of star contacts of contactor behind the arc extinction of power contactor main contacts deenergization; Deixis is set in the circuit, is convenient to operation, the circuit phase failure, contactor melting welding, contactor card gram fault alarm function are set, be convenient to maintenance circuit.
Description of drawings
Fig. 1 is a kind of control procedure figure of the utility model;
Fig. 2 is a kind of structural representation of the utility model;
Fig. 3 is the structural representation of a kind of input circuit of the utility model.
Among the figure: 1, single-chip microcomputer, 2, photoelectricity isolates, 3, input circuit; 4, output circuit, 5, the starting time selects control circuit, 6, drive circuit; 7, display circuit, 8, the contact coil, 9, enabling signal input; 10, stop signal input, 11, the input of hot guard signal, 12, the local compensation circuit; 13, current rectifying and wave filtering circuit, 14, voltage stabilizing circuit, KM1, power contactor; KM2, delta contactor, KM3, star contactor.
Embodiment
Below by specific embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of threephase asynchronous star triangle reduced voltage starting circuit (referring to accompanying drawing 2 accompanying drawings 3); the main circuit and the control circuit that comprise threephase asynchronous; control circuit comprises the single-chip microcomputer 1 that is connected with input circuit 3 and output circuit 4; output circuit is through photoelectricity isolation 2 and drive circuit 6; display circuit 7 links to each other; contact coil 8 links to each other with drive circuit again; input circuit comprises enabling signal input 9; stop signal input 10; hot guard signal input 11 and contact the input of coil feedback signal; contact coil feedback signal comprises the signal of power contactor KM1; the signal of the signal of delta contactor KM2 and star contactor KM3; display circuit is by diode displaying star initiating signal; triangle run signal and alarm signal; input circuit also comprises the input of phase shortage detection signal; affiliated phase shortage detection signal input signal provides signal by lack detection circuit; lack detection circuit comprises local compensation circuit 12; current rectifying and wave filtering circuit 13 and voltage stabilizing circuit 14, single-chip microcomputer also select control circuit 5 to link to each other with the starting time.
The course of work of monolithic processor controlled starting circuit (referring to accompanying drawing 1): KM3 is charged for the star contactor, time-delay 5ms, and power contactor KM1 is charged, time-delay 10s, the starting of threephase asynchronous machine star, power contactor KM1 outage, disjunction starting current, time-delay 30ms, star contactor KM3 outage, delta contactor KM2 is charged, time-delay 5ms, power contactor KM1 is charged, the operation of threephase asynchronous triangle.
Claims (6)
1, a kind of threephase asynchronous star triangle reduced voltage starting circuit, the main circuit and the control circuit that comprise threephase asynchronous, it is characterized in that described control circuit comprises the single-chip microcomputer that is connected with input circuit and output circuit, drive circuit, display circuit with contact coil; Isolation links to each other with drive circuit, display circuit described output circuit through photoelectricity, and the contact coil links to each other with drive circuit again.
2, threephase asynchronous star triangle reduced voltage starting circuit according to claim 1 is characterized in that described input circuit comprises enabling signal input, stop signal input, the input of hot guard signal and contacts the input of coil feedback signal.
3, threephase asynchronous star triangle reduced voltage starting circuit according to claim 1 is characterized in that described display circuit is by diode displaying star initiating signal, triangle run signal and alarm signal.
4, threephase asynchronous star triangle reduced voltage starting circuit according to claim 1 is characterized in that described input circuit also comprises the input of phase shortage detection signal, and affiliated phase shortage detection signal input signal provides signal by lack detection circuit.
5, threephase asynchronous star triangle reduced voltage starting circuit according to claim 4 is characterized in that described lack detection circuit comprises the local compensation circuit, current rectifying and wave filtering circuit and voltage stabilizing circuit.
6, threephase asynchronous star triangle reduced voltage starting circuit according to claim 1, its feature is being that described single-chip microcomputer also links to each other with starting time selection control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203106183U CN201142654Y (en) | 2007-12-14 | 2007-12-14 | Star triangular decompression starter circuit of three phase asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007203106183U CN201142654Y (en) | 2007-12-14 | 2007-12-14 | Star triangular decompression starter circuit of three phase asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201142654Y true CN201142654Y (en) | 2008-10-29 |
Family
ID=40070363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007203106183U Expired - Fee Related CN201142654Y (en) | 2007-12-14 | 2007-12-14 | Star triangular decompression starter circuit of three phase asynchronous motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201142654Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450089A (en) * | 2016-01-26 | 2016-03-30 | 河南正大起重设备有限公司 | Soft-starting intelligent module for crane |
-
2007
- 2007-12-14 CN CNU2007203106183U patent/CN201142654Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450089A (en) * | 2016-01-26 | 2016-03-30 | 河南正大起重设备有限公司 | Soft-starting intelligent module for crane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081029 Termination date: 20100114 |