CN201674447U - Motor starter - Google Patents
Motor starter Download PDFInfo
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- CN201674447U CN201674447U CN2010201817500U CN201020181750U CN201674447U CN 201674447 U CN201674447 U CN 201674447U CN 2010201817500 U CN2010201817500 U CN 2010201817500U CN 201020181750 U CN201020181750 U CN 201020181750U CN 201674447 U CN201674447 U CN 201674447U
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- motor
- triode thyristor
- bidirectional triode
- motor starter
- resistance
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Abstract
The utility model discloses a motor starter. The motor starter comprises bidirectionally-controllable silicon and a bidirectionally-controllable silicon trigger circuit, wherein the bidirectionally-controllable silicon is connected in series with an auxiliary coil of a motor when in use; the bidirectionally-controllable silicon trigger circuit comprises a full bridge rectifying circuit, a capacitor and a resistor connected in parallel with the capacitor; the first input end of the full bridge rectifying circuit is connected with the grid of the bidirectionally-controllable silicon and the second input end is used for connecting with the leading-out end of the auxiliary coil or the public end of a main coil and the auxiliary coil of the motor; and two output ends of the full bridge rectifying circuit are connected with the two ends of the capacitor. The bidirectionally-controllable silicon with the trigger circuit is adopted to fulfill the aim of completely switching off the auxiliary coil after the motor is started so that the problem of power consumption of the auxiliary coil under the normal working condition of the motor is solved. Moreover, the motor starter has the advantages of simple circuit structure, low manufacturing cost, convenient use and capability of improving the working stability of the motor starter.
Description
Technical field
The utility model relates to the electric motor starting technical field, relates in particular to a kind of motor starter.
Background technology
Operated by rotary motion main coil and ancillary coil in the alternating current machine, wherein ancillary coil only is used for the startup of motor when the motor energized, treats that motor start-up finishes after the operate as normal, and ancillary coil should be opened from circuit interruption.Motor starter promptly is to be used for finishing this function.
General PTC thermistor (PTC) element that adopts serves as motor starter in the conventional art, Fig. 1 has provided the circuit diagram of conventional motors starter, main coil is connected power supply with the common port of ancillary coil by a switch, simultaneously thermistor of ancillary coil serial connection.Work as switch closure, when power connection, motor have just begun to start,, will have bigger electric current to flow through ancillary coil because the resistance of thermistor is lower.At this moment, the auxiliary main coil of ancillary coil is finished the startup of motor together.After a period of time, because the thermistor heating functioin, its resistance increases rapidly, reduces to flow through the electric current of ancillary coil, and ancillary coil is opened from circuit interruption.But the resistance of thermistor can be infinitely great, so it is also non-vanishing to flow through the electric current of ancillary coil.Like this, under the electric motor normal working state, ancillary coil has caused the waste of the energy still at consumed power.
Fig. 2 provides a kind of improved PTC formula motor starter, than Fig. 1, increased a bidirectional triode thyristor, and with the grid trigger device of a thermistor as bidirectional triode thyristor, self-heating resistance by thermistor increases, reduce the grid current of bidirectional triode thyristor, arrive purpose by bidirectional triode thyristor.But, as triggering the influence that original paper is subjected to operating ambient temperature easily, especially at low temperatures, prolonged the start-up time of motor starter with thermistor.
The motor starter that also has a kind of inductance type, as shown in Figure 3, the grid of bidirectional triode thyristor T connects ancillary coil S, and main coil M connects second electrode of bidirectional triode thyristor T by thermistor P.Because its heating causes resistance own to increase, the electric current that flows through bidirectional triode thyristor T is ended as thermistor P less than its extinction current, ancillary coil S is opened from circuit interruption.But because inductance has the current slow effect, the moment that ancillary coil S disconnects can produce opposite equal-sized induced current with the primary current direction, this induced current flows into the grid of bidirectional triode thyristor T, and bidirectional triode thyristor T is triggered and conducting once more, consumes extra electric energy.
A kind of electronic starter is disclosed in patent 200710132228.6, comprise circuits for triggering and electronic switching circuit, the output of circuits for triggering links to each other with the control end of electronic switching circuit, the control end of circuits for triggering links to each other with delay control circuit, and delay control circuit and circuits for triggering are formed zero and triggered time delayed turn-off circuit.The structure of this circuit is complicated, has used more components and parts simultaneously, comprises photoelectrical coupler etc., makes the cost of manufacture of circuit higher.
Summary of the invention
The utility model provides a kind of motor starter simple in structure, with low cost at the problem that conventional motors ancillary coil after startup still has small amount of current to flow through.
A kind of motor starter, comprise the bidirectional triode thyristor and the bidirectional triode thyristor circuits for triggering of connecting with the ancillary coil of motor when using, described bidirectional triode thyristor circuits for triggering comprise full bridge rectifier, electric capacity and with the electric capacity parallel resistor, the first input end of full bridge rectifier connects the grid of bidirectional triode thyristor, second input is used to connect exit or the main coil of motor and the common port of ancillary coil of ancillary coil, and two outputs of full bridge rectifier connect the two ends of electric capacity.
When motor just starts, power supply charges to electric capacity after the full bridge rectifier rectification, charging current flows into the grid of bidirectional triode thyristor, as the The Trigger of Bidirectional Triode Thyristor electric current, make the bidirectional triode thyristor conducting, thereby the ancillary coil of motor is started working, and auxiliary main coil is finished the startup of motor.
After electric capacity is filled electricity, the electric capacity two ends no longer include electric current and flow through, then the grid of bidirectional triode thyristor also no longer includes trigger current and ends, the switch that is equivalent to a disconnection, the ancillary coil of series connection is with it opened from circuit interruption, no longer include electric current and flow through ancillary coil, reached the purpose that ancillary coil does not have power consumption.
Described motor starter preferably includes the thermistor that is arranged between ancillary coil and the bidirectional triode thyristor, prevents coil short, and electric current is excessive and damage controllable silicon.
Described motor starter preferably includes the current-limiting resistance with capacitances in series, and this resistance is used for limiting the size of current that flows through full bridge rectifier and electric capacity, and with control silicon controlled trigger current, the resistance of current-limiting resistance is 220～470 Ω.
The capacitance of electric capacity is preferably 0.1～0.47 μ F in the described bidirectional triode thyristor circuits for triggering, and the resistance of resistance is preferably 10～80M Ω, the charge constant of the product representation electric capacity of these two parameters.These two parameters should suitably be chosen, and make the charging interval of electric capacity be unlikely to too short, produce false triggering otherwise the variation that may cause the bidirectional triode thyristor grid current is too violent, i.e. still conducting of bidirectional triode thyristor during grid triggerless electric current.The capacitance that changes electric capacity can be regulated the start-up time of motor starter, and the resistance that changes resistance can be regulated the turnaround time of motor starter.
The utility model adopts the bidirectional triode thyristor that has circuits for triggering to reach the purpose that behind motor start-up ancillary coil is disconnected fully, solved the power problems of ancillary coil under the electric motor normal working state, and circuit structure is simple, cost of manufacture is cheap, easy to use, improved the job stability of motor starter.
Description of drawings
Fig. 1 is the circuit diagram of conventional motors starter;
Fig. 2 is the circuit diagram of PTC formula motor starter;
Fig. 3 is the circuit diagram of inductance type motor starter
Fig. 4 is the circuit diagram of embodiment 1 motor starter;
Fig. 5 is the circuit diagram of the another kind of execution mode of embodiment 1 motor starter;
Fig. 6 is the circuit diagram of embodiment 2 motor starters;
Fig. 7 is the circuit diagram of embodiment 3 motor starters;
Fig. 8 is the circuit diagram of embodiment 4 motor starters.
Embodiment
As shown in Figure 4, the motor starter of present embodiment comprises bidirectional triode thyristor S1, is connected thermistor P1 and bidirectional triode thyristor circuits for triggering 11 between the second electrode T2 of ancillary coil 1 exit of motor and bidirectional triode thyristor S1.The first electrode T1 of bidirectional triode thyristor S1 connects the exit of the main coil 2 of motor.
Bidirectional triode thyristor circuits for triggering 11 comprise current-limiting resistance R1, full bridge rectifier 12, capacitor C 1 and resistance R 2.Wherein the end of current-limiting resistance R1 connects ancillary coil 1 exit of motor, as shown in Figure 5, also can be connected to the common port of main coil 2 and ancillary coil 1.The other end of current-limiting resistance R1 connects second input 5 of full bridge rectifier 12, and the first input end 6 of full bridge rectifier 12 connects the grid G of bidirectional triode thyristor S1, and the output 7 and the output 8 of full bridge rectifier 12 inserted in capacitor C 1 and resistance R 2 backs in parallel.
The resistance of current-limiting resistance R1 is 400 Ω in the present embodiment, and the appearance value of capacitor C 1 is 0.22 μ F, and the resistance of resistance R 2 is 50M Ω.
2 common port of the ancillary coil 1 of motor and main coil is connected power supply 4 by switch 3, after switch 3 closures, power supply 4 is by 1 charging of 12 pairs of capacitor C of full bridge rectifier, this charging current flows into the grid G of bidirectional triode thyristor S1, trigger bidirectional triode thyristor S1, make its conducting, then ancillary coil 1 is started working, and auxiliary main coil 2 is finished the startup of motor.It is to prevent coil short that thermistor P1 mainly acts on, the excessive puncture bidirectional triode thyristor of electric current S1.
After capacitor C 1 charging is finished, capacitor C 1 two ends no longer include electric current and flow through, and then the grid G of bidirectional triode thyristor S1 loses trigger current, and bidirectional triode thyristor S1 is ended, disconnect ancillary coil 1, make ancillary coil 1 consumed power not under the normal operating conditions behind the motor start-up.
Present embodiment and PTC formula motor starter shown in Figure 2, inductance type starter shown in Figure 3 are done the contrast test, test result such as following table:
| Supply voltage (V) | Switch periods (second) | Present embodiment start-up time (second) | The start-up time of PTC formula (second) | The start-up time of inductance type (second) |
| 180 | 300 | 0.28 | 1.15 | 0.36 |
| 180 | 90 | 0.31 | 1.00 | 0.36 |
| 220 | 300 | 0.31 | 0.95 | 0.27 |
| 220 | 90 | 0.30 | 0.75 | 0.27 |
| 260 | 300 | 0.33 | 0.78 | 0.20 |
| 260 | 90 | 0.31 | 0.56 | 0.20 |
As seen from the above table, be subjected to the influence of supply voltage and switch periods and fluctuation is arranged the start-up time of PTC formula motor starter and inductance type starter, and be not subjected to the influence of supply voltage and switch periods the start-up time of present embodiment substantially, as can be seen, the present invention has improved the job stability of motor starter.
Simultaneously, tested the power loss of present embodiment and PTC formula motor starter, inductance type starter under 220V voltage, found that it is 1mA that the ancillary coil of PTC formula motor starter is kept electric current, power consumption 0.22W; It is 0.4mA that the ancillary coil of inductance type starter is kept electric current, power consumption 0.0124W; And the ancillary coil of present embodiment to keep electric current only be 20 μ A, power consumption 0.0044W.This shows that the present invention has significantly reduced the power consumption of ancillary coil, efficiently solve the energy dissipation problem of ancillary coil.
As shown in Figure 6,2 common port of ancillary coil 1 and main coil is connected power supply 4 by switch 3, the exit of ancillary coil 1 connects the second electrode T2 of bidirectional triode thyristor S1 by thermistor P1, the first electrode T1 of bidirectional triode thyristor S1 connects 2 exit of main coil, the exit of ancillary coil 1 connects second input 5 of full bridge rectifier 12, the first input end 6 of full bridge rectifier 12 connects the grid G of bidirectional triode thyristor S1, capacitor C 1 and resistance R 2 parallel connections, an one common port is by the output 7 of current-limiting resistance R1 connection full bridge rectifier 12, and another common port connects the output 8 of full bridge rectifier 12.
Than embodiment 1, this embodiment has changed the position of current-limiting resistance R1, under the more stable situation of power supply, can adopt present embodiment.
As shown in Figure 7,2 common port of ancillary coil 1 and main coil is connected power supply 4 by switch 3, the exit of ancillary coil 1 connects the second electrode T2 of bidirectional triode thyristor S1, the first electrode T1 of bidirectional triode thyristor S1 connects 2 exit of main coil, the exit of ancillary coil 1 connects second input 5 of full bridge rectifier 12 by current-limiting resistance R1, the first input end 6 of full bridge rectifier 12 connects the grid G of bidirectional triode thyristor S1, and the output 7 and the input 8 of full bridge rectifier 12 inserted in capacitor C 1 and resistance R 2 backs in parallel.
Than embodiment 1, this embodiment has removed the thermistor P1 between the second electrode T2 of the exit of ancillary coil 1 and bidirectional triode thyristor S1, the excessive puncture bidirectional triode thyristor of electric current when this thermistor P1 is mainly used in the protection coil short.
As shown in Figure 8,2 common port of ancillary coil 1 and main coil is connected power supply 4 by switch 3, the exit of ancillary coil 1 connects the second electrode T2 of bidirectional triode thyristor S1, the first electrode T1 of bidirectional triode thyristor S1 connects 2 exit of main coil, the exit of ancillary coil 1 connects second input 5 of full bridge rectifier 12, the first input end 6 of full bridge rectifier 12 connects the grid G of bidirectional triode thyristor S1, capacitor C 1 and resistance R 2 parallel connections, an one common port is by the output 7 of current-limiting resistance R1 connection full bridge rectifier 12, and another common port connects the output 8 of full bridge rectifier 12.
Than embodiment 1, this embodiment has removed the thermistor P1 between the second electrode T2 of the exit of ancillary coil 1 and bidirectional triode thyristor S1, and has changed the position of current-limiting resistance R1, when supply voltage not too high, under the more stable situation of power supply, can adopt present embodiment.
Claims (7)
1. motor starter, comprise the bidirectional triode thyristor (S1) and the bidirectional triode thyristor circuits for triggering (11) of connecting with the ancillary coil (1) of motor when using, it is characterized in that, described bidirectional triode thyristor circuits for triggering (11) comprise full bridge rectifier (12), electric capacity (C1) and with electric capacity (C1) parallel resistor (R2), the first input end of full bridge rectifier (12) connects the grid of bidirectional triode thyristor (S1), second input is used to connect exit or the main coil of motor and the common port of ancillary coil of ancillary coil, and two outputs of full bridge rectifier (12) connect the two ends of electric capacity (C1).
2. motor starter as claimed in claim 1 is characterized in that, comprises the thermistor that is arranged between ancillary coil (1) and the bidirectional triode thyristor (S1).
3. motor starter as claimed in claim 1 is characterized in that, the capacitance of described electric capacity (C1) is 0.1～0.47 μ F.
4. motor starter as claimed in claim 1 is characterized in that, the resistance of described resistance (R2) is 10～80M Ω.
5. motor starter as claimed in claim 1 is characterized in that, comprises the current-limiting resistance (R2) of connecting with electric capacity (C1).
6. motor starter as claimed in claim 5 is characterized in that, the resistance of described current-limiting resistance (R1) is 220～470 Ω.
7. motor starter as claimed in claim 5 is characterized in that, the capacitance of described electric capacity (C1) is 0.22 μ F, and the resistance of current-limiting resistance (R1) is 400 Ω, and the resistance of resistance (R2) is 50M Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201817500U CN201674447U (en) | 2010-05-06 | 2010-05-06 | Motor starter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201817500U CN201674447U (en) | 2010-05-06 | 2010-05-06 | Motor starter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201674447U true CN201674447U (en) | 2010-12-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201817500U Expired - Fee Related CN201674447U (en) | 2010-05-06 | 2010-05-06 | Motor starter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201674447U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860289A (en) * | 2010-05-06 | 2010-10-13 | 浙江兰科电子有限公司 | Motor starter |
| CN102158150A (en) * | 2011-04-29 | 2011-08-17 | 杭州星帅尔电器股份有限公司 | Ultra-low power consumption motor starter |
-
2010
- 2010-05-06 CN CN2010201817500U patent/CN201674447U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860289A (en) * | 2010-05-06 | 2010-10-13 | 浙江兰科电子有限公司 | Motor starter |
| CN101860289B (en) * | 2010-05-06 | 2013-04-03 | 浙江兰科电子有限公司 | Motor starter |
| CN102158150A (en) * | 2011-04-29 | 2011-08-17 | 杭州星帅尔电器股份有限公司 | Ultra-low power consumption motor starter |
| CN102158150B (en) * | 2011-04-29 | 2013-06-19 | 杭州星帅尔电器股份有限公司 | Ultra-low power consumption motor starter |
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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 |
Granted publication date: 20101215 Termination date: 20160506 |
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| CF01 | Termination of patent right due to non-payment of annual fee |