CN211046803U - Star-delta voltage reduction starting circuit - Google Patents
Star-delta voltage reduction starting circuit Download PDFInfo
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- CN211046803U CN211046803U CN201922488234.6U CN201922488234U CN211046803U CN 211046803 U CN211046803 U CN 211046803U CN 201922488234 U CN201922488234 U CN 201922488234U CN 211046803 U CN211046803 U CN 211046803U
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- open contact
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- relay
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Abstract
The utility model provides a star triangle step-down starting circuit, through set up output relay KQ and output relay KQ's normally open contact in star triangle starting circuit, and with output relay KQ's normally open contact series connection in the circuit between local gate circuit's output, remote gate circuit's output and star triangle starting circuit's input, be used for protecting star triangle starting circuit, avoid the problem that the asynchronous machine supply line on the temperature too high and can't block star triangle starting circuit; through setting up local gating circuit, can provide local control mode, can provide remote control mode through setting up remote gating circuit, the utility model discloses a local gating circuit and remote gating circuit simple structure.
Description
Technical Field
The utility model relates to a motor start field especially relates to a star triangle step-down starting circuit.
Background
When the three-phase asynchronous motor reaches the power of 4KW or more in China, the current of the motor is very high at the starting moment, and in order to protect equipment and the safety of field personnel, a delta connection method is adopted at present, and star-delta voltage reduction starting is widely adopted. At present, all be the starting switch or the stop switch that sets up control star triangle step-down starting circuit and open or close on the control box, star triangle step-down starting circuit relies on the manual work mostly to open or stop, needs the site personnel to go the scene to open or stop, has the problem of using inconveniently and control mode is single, consequently, for solving above-mentioned problem, the utility model provides a star triangle step-down starting circuit provides local control mode and remote control mode to optimize star triangle step-down starting circuit's mode of connection.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a star triangle start-up circuit that steps down provides local control mode and remote control mode to optimize star triangle start-up circuit's mode of connection.
The technical scheme of the utility model is realized in such a way that the utility model provides a star-triangle step-down starting circuit, which comprises a P L C, a local gating circuit, a remote gating circuit, a star-triangle switching circuit and a star-triangle starting circuit;
the input end of the local gating circuit and the input end of the remote gating circuit are respectively electrically connected with the power supply line, the output end of the local gating circuit and the output end of the remote gating circuit are respectively electrically connected with the input end of the star-triangle starting circuit, the output end of the star-triangle starting circuit is connected in series in a line between the star-triangle switching circuit and the power supply line, and the control end of the remote gating circuit is electrically connected with the output end of the P L C.
On the basis of the technical scheme, preferably, the remote gating circuit comprises a knob switch S1, an intermediate relay KRA, a first normally open contact of the intermediate relay KRA, a second normally open contact of the intermediate relay KRA, the intermediate relay KR and a normally open contact of the intermediate relay KR;
the knob switch S1 comprises a first normally open contact S1-1 and a second normally open contact S1-2;
the first wiring end and the live wire electric connection of second normally open contact S1-2, the second wiring end of second normally open contact S1-2 passes through auxiliary relay KRA and 0VAC electric connection, the first wiring end and the live wire electric connection of the first normally open contact of auxiliary relay KRA, the second wiring end of the first normally open contact of auxiliary relay KRA passes through the normally open contact of auxiliary relay KR and star triangle starting circuit ' S input electric connection, P L C ' S output passes through auxiliary relay KR and outside 0VDC power electric connection, the second normally open contact of auxiliary relay KRA and P L C ' S input electric connection.
Further preferably, the local gate circuit comprises a first normally open contact S1-1, an emergency stop button S2 and a start button S3;
the input ends of the first normally open contact S1-1, the emergency stop button S2, the start button S3 and the star-delta start circuit are electrically connected in sequence.
Further preferably, the star-delta starting circuit comprises an output relay KQ, a normally open contact of the output relay KQ, an alternating current contactor KM1, a second normally open contact of an alternating current contactor KM1, a third normally open contact of the alternating current contactor KM1, an alternating current contactor KM2, a normally closed contact of the alternating current contactor KM2, an alternating current contactor KM3, a second normally open contact of an alternating current contactor KM3, a normally closed contact of an alternating current contactor KM3, a time relay KT, a normally open contact of the time relay KT and a normally closed contact of the time relay KT;
a first terminal of the output relay KQ is electrically connected with a live wire, a second terminal of the output relay KQ is electrically connected with a zero line, and a voltage signal on a power supply line reaches one end of a normally closed contact of the time relay KT and one end of a second normally open contact of the alternating current contactor KM3 through a normally open contact of the output relay KQ;
the other end of the normally closed contact of the time relay KT is electrically connected with a first wiring end of an alternating current contactor KM3 through the normally closed contact of an alternating current contactor KM2, and a second wiring end of the alternating current contactor KM3 is electrically connected with an external 0VAC power supply;
the other end of the second normally open contact of the alternating current contactor KM3 is electrically connected with an external 0VAC power supply through an alternating current contactor KM1, the second normally open contact of the alternating current contactor KM1 is connected in parallel with two ends of the second normally open contact of the alternating current contactor KM3, the third normally open contact of the alternating current contactor KM1 is connected in parallel with two ends of a starting button S3, and a time relay KT is connected in parallel with two ends of an alternating current contactor KM 1;
the other end of the second normally open contact of the alternating current contactor KM3 is electrically connected with the first wiring end of the alternating current contactor KM2 through the normally open contact of the time relay KT and the normally closed contact of the alternating current contactor KM3 which are connected in series, and the second wiring end of the alternating current contactor KM2 is electrically connected with an external 0VAC power supply.
Further preferably, the star-delta switching circuit includes: the asynchronous motor, a first normally open contact of an alternating current contactor KM1, a normally open contact of an alternating current contactor KM2 and a first normally open contact of an alternating current contactor KM 3;
the first normally open contact of the alternating current contactor KM1 is connected in series in a line between the first pole pair of the asynchronous motor and the three-phase power supply line, one end of the normally open contact of the alternating current contactor KM2 is connected in series in a line between the three-phase power supply line and the first normally open contact of the alternating current contactor KM1, the other end of the normally open contact of the alternating current contactor KM2 is electrically connected with the second pole pair of the asynchronous motor, and the first normally open contact of the alternating current contactor KM3 is connected in parallel in a line between the normally open contact of the alternating current contactor KM2 and the second pole pair of the asynchronous.
Further preferably, the relay device further comprises a thermal relay FR and a normally closed contact of the thermal relay FR;
the thermal relay FR is connected in series in the line between the normally open contact of the ac contactor KM2 and the second pole pair of the asynchronous machine, and the normally closed contact of the thermal relay FR is connected in series in the line between the output relay KQ and the supply line.
The utility model discloses a star triangle step-down starting circuit has following beneficial effect for prior art:
(1) the output relay KQ and the normally open contact of the output relay KQ are arranged in the star-delta starting circuit, and the normally open contact of the output relay KQ is connected in series in a circuit between the output end of the local gating circuit, the output end of the remote gating circuit and the input end of the star-delta starting circuit, so that the star-delta starting circuit is protected, and the problem that the star-delta starting circuit cannot be blocked due to overhigh temperature on a power supply circuit of an asynchronous motor is solved;
(2) the local gating circuit can provide a local control mode, and the remote gating circuit can provide a remote control mode;
(3) the input end of the local gating circuit and the input end of the remote gating circuit are respectively and electrically connected with the power supply line, the output end of the local gating circuit and the output end of the remote gating circuit are respectively and electrically connected with the input end of the main control circuit, the control end of the remote gating circuit is electrically connected with the output end of the P L C, and the output end of the main control circuit is electrically connected with the motor starting circuit, so that the main control circuit is not controlled by the P L C, and a local control mode is provided through the local gating circuit, even if the P L C fails, the local control of the motor starting circuit can be realized through the local gating circuit, and the motor is enabled to run or shut down.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a structural diagram of a star-delta step-down starting circuit of the present invention;
FIG. 2 is a connection diagram of a star-delta switching circuit in the star-delta step-down starting circuit of the present invention;
FIG. 3 is a connection diagram of the star-delta start circuit, the local gating circuit and the remote gating circuit in the star-delta step-down start circuit of the present invention;
fig. 4 is a peripheral connection diagram of P L C in the star-delta step-down start circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in FIG. 1, the star-delta voltage reduction starting circuit of the present invention comprises a P L C, a star-delta switching circuit, a local gating circuit, a remote gating circuit and a star-delta starting circuit, wherein the input end of the local gating circuit and the input end of the remote gating circuit are electrically connected to a power supply line respectively, the output end of the local gating circuit and the output end of the remote gating circuit are electrically connected to the input end of the star-delta starting circuit respectively, the control end of the remote gating circuit is electrically connected to the output end of the P L C, and the output end of the star-delta starting circuit is electrically connected to the input end of the star-delta switching circuit.
In the embodiment, as shown in fig. 3, the remote gating circuit comprises a knob switch S1, an intermediate relay KRA, a first normally open contact of the intermediate relay KRA, a second normally open contact of the intermediate relay KRA, normally open contacts of the intermediate relay KRA, the intermediate relay KR and the intermediate relay KR, a knob switch S1 comprises a first normally open contact S1-1 and a second normally open contact S1-2, a first terminal of the second normally open contact S1-2 is electrically connected with a live wire, a second terminal of the second normally open contact S1-2 is electrically connected with 0VAC through the intermediate relay KRA, a first terminal of the first normally open contact of the intermediate relay KRA is electrically connected with the live wire, a second terminal of the first normally open contact of the intermediate relay KRA is electrically connected with an input end of the star-delta starting circuit through the normally open contact of the intermediate relay KR, an output end of a P L C is electrically connected with an external 0VDC power supply through the intermediate relay KR, and a second terminal of the normally open contact P L C is electrically connected with an input end of the intermediate relay KR.
In the embodiment, the working principle of the remote gating circuit is that a field technician presses a second normally open contact S1-2 to select a remote control mode, at the moment, the intermediate relay KRA is electrified, the first normally open contact and the second normally open contact of the intermediate relay KRA are hopped to be in a closed state from an original open state, P L C learns that the field technician selects the remote control mode, P L C energizes the intermediate relay KR, the normally open contact of the intermediate relay KR is hopped to be in the closed state from the original open state, voltage on a live wire reaches the input end of the star-delta starting circuit through the first normally open contact of the closed intermediate relay KRA and the normally open contact of the intermediate relay KR, so that the intermediate relays in the star-delta starting circuit are electrified in succession, contacts corresponding to the intermediate relay connected in the star-delta switching circuit in series are hopped to be in the closed state from the original open state, and the motor is electrified.
It is further preferred that the local gate circuit provides a local control mode, when the field technician selects the local control mode, the control motor is not started or stopped by the P L C, and thus, the start and stop of the motor can be continued by the local gate circuit when the P L C fails.
In this embodiment, the working principle of the local gating circuit is as follows: a field technician selects a local control mode by rotating the knob switch S1 and presses the start button S3, at the moment, a voltage signal on a bus reaches the input end of the star-delta starting circuit through the closed knob switch S1, the emergency stop button S2 and the start button S3, so that intermediate relays in the star-delta starting circuit are electrified in succession, contacts corresponding to the intermediate relays connected in series in the star-delta switching circuit are jumped from an original open state to a closed state, and a motor is electrified to operate.
Further preferably, as shown in fig. 3, the star-delta starting circuit comprises an output relay KQ, a normally open contact of the output relay KQ, an alternating current contactor KM1, a second normally open contact of an alternating current contactor KM1, a third normally open contact of an alternating current contactor KM1, an alternating current contactor KM2, a normally closed contact of an alternating current contactor KM2, an alternating current contactor KM3, a second normally open contact of an alternating current contactor KM3, a normally closed contact of an alternating current contactor KM3, a time relay KT, a normally open contact of the time relay KT, and a normally closed contact of the time relay KT;
the specific connection relationship of the star-delta starting circuit is as follows: a first wiring end of the output relay KQ is electrically connected with a live wire, a second wiring end of the output relay KQ is electrically connected with a zero wire, and a starting button S3 and a normally open contact of the intermediate relay KR are respectively electrically connected with one end of a normally closed contact of the time relay KT and one end of a second normally open contact of the alternating current contactor KM3 through the normally open contact of the output relay KQ; the other end of the normally closed contact of the time relay KT is electrically connected with a first wiring end of an alternating current contactor KM3 through the normally closed contact of an alternating current contactor KM2, and a second wiring end of the alternating current contactor KM3 is electrically connected with an external 0VAC power supply; the other end of the second normally open contact of the alternating current contactor KM3 is electrically connected with an external 0VAC power supply through an alternating current contactor KM1, the second normally open contact of the alternating current contactor KM1 is connected in parallel with two ends of the second normally open contact of the alternating current contactor KM3, the third normally open contact of the alternating current contactor KM1 is connected in parallel with two ends of a starting button S3, and a time relay KT is connected in parallel with two ends of an alternating current contactor KM 1; the other end of the second normally open contact of the alternating current contactor KM3 is electrically connected with the first wiring end of the alternating current contactor KM2 through the normally open contact of the time relay KT and the normally closed contact of the alternating current contactor KM3 which are connected in series, and the second wiring end of the alternating current contactor KM2 is electrically connected with an external 0VAC power supply.
Further preferably, as shown in fig. 2, the star-delta switching circuit includes: the asynchronous motor, the first normally open contact of the alternating current contactor KM1, the normally open contact of the alternating current contactor KM2 and the first normally open contact of the alternating current contactor KM 3. The specific connection relationship is as follows: the first normally open contact of the alternating current contactor KM1 is connected in series in a line between the first pole pair of the asynchronous motor and the three-phase power supply line, one end of the normally open contact of the alternating current contactor KM2 is connected in series in a line between the three-phase power supply line and the first normally open contact of the alternating current contactor KM1, the other end of the normally open contact of the alternating current contactor KM2 is electrically connected with the second pole pair of the asynchronous motor, and the first normally open contact of the alternating current contactor KM3 is connected in parallel in a line between the normally open contact of the alternating current contactor KM2 and the second pole pair of the asynchronous.
In this embodiment, the working principle of the star-delta starting circuit and the star-delta switching circuit is as follows: the local gating circuit or the remote gating circuit outputs a voltage signal to a normally open contact of an output relay KQ, meanwhile, a power supply line supplies the output relay KQ, the normally open contact of the output relay KQ jumps from an original open state to a closed state, the local gating circuit or the remote gating circuit can output the voltage signal to a normally closed contact of a time relay KT and a second normally open contact of an alternating current contactor KM3 through the normally open contact of the closed output relay KQ, at the moment, the second normally open contact of the alternating current contactor KM3 is opened, the voltage signal can only reach an alternating current contactor KM3 from the normally closed contact of the time relay KT 2 which is connected in series and closed, the alternating current contactor KM3 is electrified, the first normally open contact of the alternating current contactor KM3 and the second normally open contact of the alternating current contactor KM3 jump from the original open state to the closed state, and the normally closed contact of the alternating current contactor KM3, voltage signals reach the alternating current contactor KM1 and the time relay KT through a second normally open contact of the alternating current contactor KM3, the alternating current contactor KM1 and the time relay KT are electrified, and the contact of the time relay KT needs to be delayed to a specified time to act, so that the normally open contact of the time relay KT and the normally closed contact of the time relay KT are kept in an original state at the moment; meanwhile, the first normally open contact and the second normally open contact of the alternating current contactor KM1 are switched to a closed state from an original open state, a voltage signal on the three-phase power supply line reaches a first pole pair of the asynchronous motor through the first normally open contact of the alternating current contactor KM1, and the motor is electrified and operates; the second normally open contact of the alternating current contactor KM1 and the second normally open contact of the alternating current contactor KM3 form self-locking, and the situation that the alternating current contactor KM1 loses power and the star cannot be switched to a triangle due to unreliable attraction of the alternating current contactor KM3 is avoided. After the time relay KT reaches the designated time, the normally open contact of the time relay KT jumps from the original open state to the closed state, the normally closed contact of the time relay KT jumps from the closed state to the open state, the alternating current contactor KM3 loses power, the normally closed contact of the alternating current contactor KM3 jumps from the open state to the closed state, a voltage signal reaches the alternating current contactor KM2 through the normally open contact of the time relay KT and the normally closed contact of the alternating current contactor KM3, the alternating current contactor KM2 is electrified, the normally open contact of the alternating current contactor KM2 jumps from the original open state to the closed state, at the moment, a voltage signal on a three-phase power supply line reaches a second pole pair of the asynchronous motor through the normally open contact of the alternating current contactor KM2, and at the moment, a branch where the; the normally closed contact of the alternating current contactor KM2 jumps from an original closed state to an open state, the alternating current contactor KM3 loses power, and the first normally open contact of the alternating current contactor KM3 and the second normally open contact of the alternating current contactor KM3 jump from the closed state to the open state.
Further preferably, as shown in fig. 2, the method further includes: a normally closed contact of the thermal relay FR and the thermal relay FR; the specific connection relationship is as follows: the thermal relay FR is connected in series in the line between the normally open contact of the ac contactor KM2 and the second pole pair of the asynchronous machine, and the normally closed contact of the thermal relay FR is connected in series in the line between the output relay KQ and the supply line.
The beneficial effect of this embodiment does: the output relay KQ and the normally open contact of the output relay KQ are arranged in the star-delta starting circuit, and the normally open contact of the output relay KQ is connected in series in a circuit between the output end of the local gating circuit, the output end of the remote gating circuit and the input end of the star-delta starting circuit, so that the star-delta starting circuit is protected, and the problem that the star-delta starting circuit cannot be blocked due to overhigh temperature on a power supply circuit of an asynchronous motor is solved;
the local gating circuit can provide a local control mode by setting the local gating circuit, and the remote gating circuit can provide a remote control mode by setting the remote gating circuit;
the input end of the local gating circuit and the input end of the remote gating circuit are respectively and electrically connected with the power supply line, the output end of the local gating circuit and the output end of the remote gating circuit are respectively and electrically connected with the input end of the main control circuit, the control end of the remote gating circuit is electrically connected with the output end of the P L C, and the output end of the main control circuit is electrically connected with the motor starting circuit, so that the main control circuit is not controlled by the P L C, and a local control mode is provided through the local gating circuit, even if the P L C fails, the local control of the motor starting circuit can be realized through the local gating circuit, and the motor is enabled to run or shut down.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A star-delta step-down starting circuit comprises a P L C, and is characterized by also comprising a local gating circuit, a remote gating circuit, a star-delta switching circuit and a star-delta starting circuit;
the input end of the local gating circuit and the input end of the remote gating circuit are electrically connected with the power supply line respectively, the output end of the local gating circuit and the output end of the remote gating circuit are electrically connected with the input end of the star-triangle starting circuit respectively, the output end of the star-triangle starting circuit is connected in series in a line between the star-triangle switching circuit and the power supply line, and the control end of the remote gating circuit is electrically connected with the output end of the P L C.
2. The star-delta buck starting circuit as claimed in claim 1, further comprising: the remote gating circuit comprises a knob switch S1, an intermediate relay KRA, a first normally open contact of the intermediate relay KRA, a second normally open contact of the intermediate relay KRA, a normally open contact of the intermediate relay KR and a normally open contact of the intermediate relay KR;
the knob switch S1 comprises a first normally open contact S1-1 and a second normally open contact S1-2;
the first wiring end and the live wire electric connection of second normally open contact S1-2, the second wiring end of second normally open contact S1-2 passes through auxiliary relay KRA and 0VAC electric connection, the first wiring end and the live wire electric connection of the first normally open contact of auxiliary relay KRA, the second wiring end of the first normally open contact of auxiliary relay KRA passes through the normally open contact of auxiliary relay KR and star triangle starting circuit ' S input electric connection, P L C ' S output passes through auxiliary relay KR and outside 0VDC power electric connection, the second normally open contact of auxiliary relay KRA and P L C ' S input electric connection.
3. The star-delta buck starting circuit as claimed in claim 2, wherein: the local gating circuit comprises a first normally open contact S1-1, an emergency stop button S2 and a start button S3;
the first normally open contact S1-1, the emergency stop button S2, the start button S3 and the input end of the star-delta start circuit are electrically connected in sequence.
4. The star-delta buck starting circuit as set forth in claim 3, wherein: the star-delta starting circuit comprises an output relay KQ, a normally open contact of the output relay KQ, an alternating current contactor KM1, a second normally open contact of an alternating current contactor KM1, a third normally open contact of an alternating current contactor KM1, an alternating current contactor KM2, a normally closed contact of an alternating current contactor KM2, an alternating current contactor KM3, a second normally open contact of an alternating current contactor KM3, a normally closed contact of an alternating current contactor KM3, a time relay KT, a normally open contact of the time relay KT and a normally closed contact of the time relay KT;
a first terminal of the output relay KQ is electrically connected with a live wire, a second terminal of the output relay KQ is electrically connected with a zero line, and a voltage signal on the power supply line reaches one end of a normally closed contact of the time relay KT through a normally open contact of the output relay KQ and is electrically connected with one end of a second normally open contact of the alternating current contactor KM 3;
the other end of the normally closed contact of the time relay KT is electrically connected with a first wiring end of an alternating current contactor KM3 through the normally closed contact of an alternating current contactor KM2, and a second wiring end of the alternating current contactor KM3 is electrically connected with an external 0VAC power supply;
the other end of the second normally open contact of the alternating current contactor KM3 is electrically connected with an external 0VAC power supply through an alternating current contactor KM1, the second normally open contact of the alternating current contactor KM1 is connected in parallel with two ends of the second normally open contact of the alternating current contactor KM3, the third normally open contact of the alternating current contactor KM1 is connected in parallel with two ends of a starting button S3, and a time relay KT is connected in parallel with two ends of an alternating current contactor KM 1;
the other end of the second normally open contact of the alternating current contactor KM3 is electrically connected with the first wiring end of the alternating current contactor KM2 through the normally open contact of the time relay KT and the normally closed contact of the alternating current contactor KM3 which are connected in series, and the second wiring end of the alternating current contactor KM2 is electrically connected with an external 0VAC power supply.
5. The star-delta buck starting circuit as set forth in claim 4, wherein: the star-delta switching circuit includes: the asynchronous motor, a first normally open contact of an alternating current contactor KM1, a normally open contact of an alternating current contactor KM2 and a first normally open contact of an alternating current contactor KM 3;
the first normally open contact of the alternating current contactor KM1 is connected in series in a line between a first pole pair of the asynchronous motor and the three-phase power supply line, one end of the normally open contact of the alternating current contactor KM2 is connected in series in a line between the three-phase power supply line and the first normally open contact of the alternating current contactor KM1, the other end of the normally open contact of the alternating current contactor KM2 is electrically connected with a second pole pair of the asynchronous motor, and the first normally open contact of the alternating current contactor KM3 is connected in parallel in a line between the normally open contact of the alternating current contactor KM2 and the second pole pair of the asynchronous motor.
6. The star-delta buck starting circuit as set forth in claim 5, wherein: the relay also comprises a thermal relay FR and a normally closed contact of the thermal relay FR;
the thermorelay FR is connected in series in the line between the normally open contact of the ac contactor KM2 and the second pole pair of the asynchronous machine, and the normally closed contact of the thermorelay FR is connected in series in the line between the output relay KQ and the supply line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922488234.6U CN211046803U (en) | 2019-12-31 | 2019-12-31 | Star-delta voltage reduction starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922488234.6U CN211046803U (en) | 2019-12-31 | 2019-12-31 | Star-delta voltage reduction starting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211046803U true CN211046803U (en) | 2020-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922488234.6U Active CN211046803U (en) | 2019-12-31 | 2019-12-31 | Star-delta voltage reduction starting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953310A (en) * | 2021-04-14 | 2021-06-11 | 河南金马信捷电气科技有限公司 | Star-delta dual-power soft starting device for heavy-load starting of conveyor |
-
2019
- 2019-12-31 CN CN201922488234.6U patent/CN211046803U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953310A (en) * | 2021-04-14 | 2021-06-11 | 河南金马信捷电气科技有限公司 | Star-delta dual-power soft starting device for heavy-load starting of conveyor |
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