CN215646646U - Three-phase asynchronous motor's step-down starting system - Google Patents
Three-phase asynchronous motor's step-down starting system Download PDFInfo
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- CN215646646U CN215646646U CN202122053071.6U CN202122053071U CN215646646U CN 215646646 U CN215646646 U CN 215646646U CN 202122053071 U CN202122053071 U CN 202122053071U CN 215646646 U CN215646646 U CN 215646646U
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Abstract
The utility model provides a voltage reduction starting system of a three-phase asynchronous motor, which comprises the three-phase asynchronous motor and a power supply module, wherein the three-phase asynchronous motor comprises a voltage reduction starting wiring terminal and a high-voltage operation wiring terminal, the voltage reduction starting wiring terminal and the high-voltage operation wiring terminal are both electrically connected with the power supply module, the voltage reduction starting power supply control circuit and a power supply delay connection unit are also included, the voltage reduction starting power supply control circuit comprises a voltage reduction starting power supply control circuit and a high-voltage operation power supply control circuit, and the voltage reduction starting power supply control circuit and the high-voltage operation power supply control circuit are both in signal connection with the power supply module; the voltage reduction starting power supply control circuit is electrically connected with the high-voltage operation power supply control circuit; the power supply delay switch-on unit is provided with a switch control part and a switch part, wherein the switch control part is in signal connection with the switch part and is electrically connected with the high-voltage operation power supply control circuit. Through setting up the power and postponing the unit of putting through, can effectively solve the problem that the too fast of second switch actuation leads to short circuit in the twinkling of an eye.
Description
Technical Field
The utility model relates to the technical field of three-phase asynchronous motors, in particular to a voltage reduction starting system of a three-phase asynchronous motor.
Background
The three-phase asynchronous motor is widely applied due to the advantages of simple structure, low price, high reliability and the like, but the starting current is large in the starting process, so that the motor with large capacity needs to be started in a certain mode, the star-delta switching starting is a simple and convenient voltage reduction starting mode, and the star-delta starting can be realized in a manual and automatic operation control mode.
At present, after a three-phase asynchronous motor is started, when the three-phase asynchronous motor is automatically switched by a star triangle, an obvious arc pulling field can occur when a third switch is switched off, and at the moment, if the third switch is not switched off fast enough or a second switch is switched on too fast, an arc short circuit condition is easy to occur.
An effective solution to the problems in the related art has not been proposed yet.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a voltage-reducing starting system of a three-phase asynchronous motor, which solves the problem that an arc short circuit is easy to occur when star triangles of the three-phase asynchronous motor are automatically switched in the prior art.
The technical scheme of the utility model is realized as follows: the utility model provides a voltage-reducing starting system of a three-phase asynchronous motor, which comprises the three-phase asynchronous motor and a power supply module, wherein the three-phase asynchronous motor comprises a voltage-reducing starting terminal and a high-voltage operation terminal, the voltage-reducing starting terminal and the high-voltage operation terminal are both electrically connected with the power supply module, the voltage-reducing starting system also comprises a voltage-reducing starting power supply control circuit and a power supply delay connection unit, wherein,
the voltage reduction starting power supply control circuit comprises a voltage reduction starting power supply control circuit and a high-voltage operation power supply control circuit, and the voltage reduction starting power supply control circuit and the high-voltage operation power supply control circuit are in signal connection with the power supply module;
the voltage reduction starting power supply control circuit is electrically connected with the high-voltage operation power supply control circuit;
the power supply delay switch-on unit is provided with a switch control part and a switch part, wherein the switch control part is in signal connection with the switch part and is electrically connected with the high-voltage operation power supply control circuit.
On the basis of the above technical solution, preferably, the power module includes a main contact of a contactor KM1, a main contact of a contactor KM2, a main contact of a contactor KM3, and a three-phase power supply, wherein,
the main contact of the contactor KM1 and the main contact of the contactor KM3 are in signal connection with a voltage reduction starting power supply control circuit; two ends of a main contact of the contactor KM1 are respectively and electrically connected with a voltage reduction starting terminal and a three-phase power supply;
one end of a main contact of the contactor KM3 is electrically connected with the high-voltage operation wiring terminal, and the other end of the main contact is in short circuit;
the main contact of the contactor KM2 is in signal connection with a control circuit of a high-voltage operation power supply, and two ends of the contactor KM2 are respectively electrically connected with a high-voltage operation terminal and a three-phase power supply.
On the basis of the above technical solution, preferably, the step-down starting power supply control circuit comprises a coil of a contactor KM1, a coil of a contactor KM3, and a start button S1, wherein,
the coil of the contactor KM1 is connected with the coil of the contactor KM3 in parallel and electrically connected with a zero line;
one end of the start button S1 is electrically connected with the coil of the contactor KM1 and the coil of the contactor KM3 respectively, and the other end is electrically connected with a live wire.
On the basis of the above technical scheme, preferably, the step-down starting power supply control circuit further comprises a relay KT coil and a relay KT normally closed contact, wherein,
the relay KT coil is connected with the relay KT normally closed contact in parallel, and two ends of the relay KT coil are respectively and electrically connected with the starting button S1 and the zero line;
the relay KT normally closed contact is connected in series with the coil of the contactor KM3, and two ends of the relay KT normally closed contact are respectively and electrically connected with the starting button S1 and the coil of the contactor KM 3.
On the basis of the above technical solution, preferably, the step-down starting power control circuit further includes an auxiliary normally closed contact of a contactor KM2 and an auxiliary normally open contact of a contactor KM3, wherein,
one end of an auxiliary normally closed contact of the contactor KM2 is electrically connected with the starting button S1, and the other end of the auxiliary normally closed contact of the relay KT is electrically connected with the normally closed contact of the relay KT, the coil of the relay KT and an auxiliary normally open contact of the contactor KM3 respectively;
the auxiliary normally open contact of the contactor KM3 is connected with the coil of the contactor KM1 in series, and the auxiliary normally open contact of the contactor KM3, the coil of the contactor KM1, the high-voltage operation power supply control circuit and the switch control part are electrically connected with each other.
On the basis of the above technical solution, preferably, the switch control part is a coil of a contactor KM4, the switch part is an auxiliary normally open contact of a contactor KM4, and the coil of the contactor KM4 and the auxiliary normally open contact of the contactor KM4 are connected in parallel in the control circuit of the high-voltage operation power supply.
On the basis of the above technical solution, preferably, the high-voltage operation power control circuit comprises a coil of a contactor KM2, an auxiliary normally open contact of a contactor KM1, and an auxiliary normally closed contact of a contactor KM3, wherein,
a coil of the contactor KM2 is connected in series with an auxiliary normally open contact of the contactor KM4, and an auxiliary normally open contact of the contactor KM1, an auxiliary normally closed contact of the contactor KM3 and a coil of the contactor KM4 are sequentially connected in series;
the coil of the contactor KM2 and the coil of the contactor KM4 are both electrically connected with a zero line, and the auxiliary normally open contact of the contactor KM1 and the auxiliary normally open contact of the contactor KM4 are both electrically connected with a live line;
the auxiliary normally open contact of the contactor KM1 is connected in series with the coil of the contactor KM1, and is connected in parallel with the auxiliary normally open contact of the contactor KM3 and the coil of the contactor KM 4.
On the basis of the technical scheme, the relay protection device preferably further comprises an overload protection module, wherein the overload protection module comprises a relay FR heating unit and a relay FR normally closed contact; two ends of the FR heating unit of the relay are respectively and electrically connected with the power supply module and the voltage reduction starting terminal; and two ends of the FR normally closed contact of the relay are respectively and electrically connected with the voltage-reducing starting power supply control circuit and the live wire.
On the basis of the above technical solution, preferably, the step-down starting power supply control circuit further includes a stop button S2, the stop button S2 is connected in series with the normally closed contact of the relay FR, one end of the stop button is electrically connected with the normally closed contact of the relay FR, and the other end of the stop button is electrically connected with the step-down starting power supply control circuit and the high-voltage operation power supply control circuit respectively.
On the basis of the above technical solution, preferably, the step-down starting power supply control circuit further includes an emergency stop button S3, the emergency stop button S3 is connected in series with the relay FR normally closed contact, and two ends of the emergency stop button S3 are electrically connected with the relay FR normally closed contact and the live wire respectively.
On the basis of the above technical solution, preferably, the emergency stop device further includes an emergency stop button S3, and two ends of the emergency stop button S3 are electrically connected to the live wire and the normally closed contact of the relay FR respectively.
Compared with the prior art, the voltage reduction starting system of the three-phase asynchronous motor has the following beneficial effects:
(1) by arranging the power supply delay switch-on unit, the power supply delay switch-on unit is provided with a switch control part and a switch part, the switch control part is in signal connection with the switch part, the switch control part is a coil of a contactor KM4, the switch part is an auxiliary normally open contact of a contactor KM4, and the coil of the contactor KM4 and the auxiliary normally open contact of the contactor KM4 are connected in parallel in a high-voltage starting power supply control circuit; the contactor KM2 coil is connected in series with the auxiliary normally open contact of contactor KM4, the auxiliary normally open contact of contactor KM1, the auxiliary normally closed contact of contactor KM3 and the coil of contactor KM4 are connected in series in sequence, the coil of contactor KM2 and the coil of contactor KM4 are all electrically connected with a zero line, the auxiliary normally open contact of contactor KM1 and the auxiliary normally open contact of contactor KM4 are all electrically connected with a live wire, the auxiliary normally open contact of contactor KM1 is connected in series with the coil of contactor KM1, and are connected in parallel with the auxiliary normally open contact of contactor KM3 and the coil of contactor KM 4. After the coil of the contactor KM4 is electrified, the contact of the contactor KM4 is used as a normally open contact, time delay is realized during mechanical attraction, and when the main contact of the contactor KM3 is flicked by self elastic machinery, time delay is also realized, therefore, when the three-phase asynchronous motor is switched to high-voltage operation from voltage reduction starting, under the action of the coil of the contactor KM4 and the contact of the contactor KM4, the problems that the main contact of the contactor KM2 is short-circuited in the moment and electrical accidents are caused due to too high closing speed can be effectively solved, and the design structure is simple and practical. (2) An auxiliary normally closed contact of a contactor KM2 is arranged, one end of the auxiliary normally closed contact of the contactor KM2 is electrically connected with a starting button S1, and the other end of the auxiliary normally closed contact of the contactor KM2 is electrically connected with a normally closed contact of a relay KT, a coil of the relay KT and an auxiliary normally open contact of the contactor KM3 respectively. When the coil of the contactor KM2 is electrified, the contactor KM2 assists the normally closed contact to be opened, and the problems that the main contact of the contactor KM3 is not opened fast enough and the main contact of the contactor KM2 is closed too fast can be solved.
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 the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a step-down starting system of a three-phase asynchronous motor according to the present invention;
fig. 2 is a circuit diagram of a step-down starting power supply control circuit in a step-down starting system of a three-phase asynchronous motor according to the present invention;
fig. 3 is a schematic diagram of the operation of the step-down starting system of the three-phase asynchronous motor according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 to 3, the buck starting system for a three-phase asynchronous motor according to the present invention includes a three-phase asynchronous motor, a power module, a buck starting power control circuit, a power delay unit, and an overload protection module. The three-phase asynchronous motor voltage reduction starting terminal comprises U1, V1 and W1, and the high-voltage operation terminal comprises W2, U2 and V2; the power supply module comprises a main contact of a contactor KM1, a main contact of a contactor KM2, a main contact of a contactor KM3 and a three-phase power supply, wherein the three-phase power supply comprises L1, L2 and L3; u1, V1 and W1 are electrically connected with L1, L2 and L3 in a one-to-one correspondence mode through a main contact of a contactor KM1, one end of the main contact of the contactor KM3 is electrically connected with W2, U2 and V2 respectively, and the other end of the main contact is in short circuit, so that the voltage reduction starting power supply circuit of the three-phase asynchronous motor is formed; w2, U2 and V2 are electrically connected with L1, L2 and L3 in a one-to-one correspondence mode through a main contact of a contactor KM2, W2, U2 and V2 are respectively connected with U1, V1 and W1 through a main contact of a contactor KM2 to form an angle connection method, the voltage on each winding is increased to 380V, the motor obtains larger torque, and the high-voltage operation power circuit of the three-phase asynchronous motor is formed. The step-down starting power supply control circuit comprises a step-down starting power supply control circuit, a high-voltage operation power supply control circuit, a stop button S2 and an emergency stop button S3, wherein a main contact of a contactor KM1 and a main contact of a contactor KM3 are in signal connection with the step-down starting power supply control circuit, a main contact of a contactor KM2 is in signal connection with the high-voltage operation power supply control circuit, a stop button S2 and an emergency stop button S3 are connected in series, the emergency stop button S3 is connected into a live wire, the stop button S2 is respectively electrically connected with the step-down starting power supply control circuit and the high-voltage operation power supply control circuit, and the step-down starting power supply control circuit is electrically connected with the high-voltage operation power supply control circuit and is respectively connected into a zero line; the power supply delay switch-on unit is provided with a switch control part and a switch part, wherein the switch control part is in signal connection with the switch part and is electrically connected with the high-voltage operation power supply control circuit; after the voltage reduction starting power supply control circuit is powered on, the main contact of the contactor KM1 and the main contact of the contactor KM3 can be controlled to be closed, so that the three-phase asynchronous motor runs at low voltage, after the voltage reduction starting power supply control circuit is powered off, the high-voltage running power supply control circuit is switched on, the main contact of the contactor KM3 can be controlled, and the main contact of the contactor KM1 is still in a closed state at the moment, so that the three-phase asynchronous motor is switched to run at high voltage, and higher torque and bearing can be obtained; in the process of switching low-voltage operation to high-voltage operation, the power supply delay connection unit can effectively solve the problems of instant short circuit and electrical accidents caused by the fact that the closing speed of the main contact of the contactor KM2 is too high.
In a specific embodiment of the present invention, the step-down start power control circuit is a step-down start operation control circuit of a three-phase asynchronous motor, the step-down start power control circuit includes a contactor KM1 coil, a contactor KM3 coil, and a start button S1, the contactor KM1 coil is connected in parallel with the contactor KM3 coil and is electrically connected to the zero line, the start button S1 is a normally open contact, one end of the start button S1 is electrically connected to the contactor KM1 coil and the contactor KM3 coil, respectively, and the other end is electrically connected to the live line; when the starting button S1 is pressed and closed, the coil of the contactor KM1 is electrified with the coil of the contactor KM3 to generate magnetic force, the main contact of the contactor KM1 and the main contact of the contactor KM3 are closed, so that the voltage-reduction starting power circuit is electrified, at the moment, the three-phase power supplies power to the motor from U1, V1 and W1, the W2, U2 and V2 are short-circuited, and the motor is started in voltage reduction mode, namely, the voltage is reduced to be lower than the rated working voltage to start, so that the starting current is reduced. The control circuit of the voltage-reducing starting power supply also comprises a relay KT coil, a relay KT normally closed contact, a contactor KM2 auxiliary normally closed contact and a contactor KM3 auxiliary normally open contact; the relay KT coil is connected with the relay KT normally closed contact in parallel, two ends of the relay KT coil are respectively electrically connected with the starting button S1 and the zero line, the relay KT normally closed contact is connected with the contactor KM3 coil in series, two ends of the relay KT normally closed contact are respectively electrically connected with the starting button S1 and the contactor KM3 coil, the relay KT coil can generate magnetic force when the rotating speed of the motor reaches the rated rotating speed, the relay KT normally closed contact is disconnected, the main contact of the contactor KM3 is also disconnected along with the magnetic force, and the motor can be switched to high-voltage operation at the moment; one end of an auxiliary normally closed contact of the contactor KM2 is electrically connected with the starting button S1, the other end of the auxiliary normally closed contact of the contactor KM2 is electrically connected with a normally closed contact of the relay KT, a coil of the relay KT and an auxiliary normally open contact of the contactor KM3 respectively, the auxiliary normally open contact of the contactor KM3 is connected with a coil of the contactor KM1 in series, and the auxiliary normally open contact of the contactor KM3, the coil of the contactor KM1, a high-voltage starting power supply control circuit and a switch control part are electrically connected with each other.
In a specific embodiment of the utility model, the high-voltage operation power supply control circuit is a control circuit for switching the step-down starting of the three-phase asynchronous motor into the high-voltage operation, and comprises a coil of a contactor KM2, an auxiliary normally open contact of a contactor KM1 and an auxiliary normally closed contact of a contactor KM 3; the power supply delay connection unit is a contactor KM4, the switch control part is a contactor KM4 coil, the switch part is a contactor KM4 auxiliary normally open contact, and the contactor KM4 coil and the contactor KM4 auxiliary normally open contact are connected in parallel in the high-voltage starting power supply control circuit; the contactor KM2 coil is connected in series with the auxiliary normally open contact of the contactor KM4, the auxiliary normally open contact of the contactor KM1, the auxiliary normally closed contact of the contactor KM3 and the coil of the contactor KM4 are sequentially connected in series, the coil of the contactor KM2 and the coil of the contactor KM4 are both electrically connected with a zero line, the auxiliary normally open contact of the contactor KM1 and the auxiliary normally open contact of the contactor KM4 are both electrically connected with a live line, the auxiliary normally open contact of the contactor KM1 is connected in series with the coil of the contactor KM1 and connected in parallel with the auxiliary normally open contact of the contactor KM3 and the coil of the contactor KM 4; when the starting button S1 is closed, the coil of the contactor KM3 is electrified, so that the auxiliary normally open contact of the contactor KM3 is closed, the auxiliary normally closed contact of the contactor KM3 is disconnected, the coil of the contactor KM1 is electrified, the auxiliary normally open contact of the contactor KM1 is closed, and at the moment, the voltage-reducing starting power supply circuit is electrified; when the rotating speed of the motor reaches a rated rotating speed, the coil of the contactor KM3 can be powered off through a relay KT, at the moment, the coil of the contactor KM1 is still in an electrified state, an auxiliary normally closed contact of the contactor KM3 is automatically closed by the elasticity of the contactor KM3, so that the coil of the contactor KM4 is electrified and generates magnetic force, the auxiliary normally open contact of the contactor KM4 is closed, the coil of the contactor KM2 is closed, a main contact of the contactor KM2 is closed, a high-voltage operation power circuit is electrified, a three-phase power supply supplies power to the motor from W2, U2 and V2, the main contacts of the W2, the U2 and the V2 are respectively connected with the U1, the V1 and the W1 through the main contacts of the contactor KM2 to form an angle connection method, the voltage on each winding is increased to 380V, and the motor obtains larger torque. After the coil of the contactor KM4 is electrified, the contact of the contactor KM4 is used as a normally open contact, time delay is realized during mechanical attraction, and the time delay is also realized when the main contact of the contactor KM3 is flicked by self elastic machinery, so that when the three-phase asynchronous motor is switched from voltage reduction starting to high-voltage operation, the problems of instant short circuit and electric accidents caused by the fact that the main contact of the contactor KM2 is over-high in closing speed can be effectively solved under the action of the coil of the contactor KM4 and the contact of the contactor KM4, and the design structure is simple and practical; after the coil of the contactor KM2 is electrified, the contactor KM2 assists the normally closed contact to be disconnected, and the problems that the main contact of the contactor KM3 is not fast to be disconnected and the main contact of the contactor KM2 is too fast to be closed can also be solved.
In a specific embodiment of the present invention, the overload protection module is a thermal relay FR, which includes a relay FR heating unit and a relay FR normally closed contact, two ends of the relay FR heating unit are electrically connected to the main contact of the contactor KM1 and the low-voltage starting terminal, respectively, and two ends of the relay FR normally closed contact are electrically connected to the step-down starting power supply control circuit and the live wire, respectively; when the high-voltage operation is overloaded, after the overload current passes through the FR heating unit of the relay, the bimetallic strip is heated and bent to push the action mechanism to drive the FR normally-closed contact of the relay to be disconnected, so that the control circuit is disconnected to realize power failure, and the overload protection effect is achieved. The stop button S2 is a normally closed contact, the stop button S2 is connected with the relay FR normally closed contact in series, one end of the stop button is electrically connected with the relay FR normally closed contact, the other end of the stop button is electrically connected with the low-voltage starting power supply control circuit and the high-voltage starting power supply control circuit respectively, after the motor is used, the stop button S2 can be pressed to cut off the voltage reduction starting power supply control circuit, so that the power supply module is also cut off, and the three-phase asynchronous motor stops running. The emergency stop button S3 is also a normally closed contact, and both ends of the emergency stop button S3 are electrically connected to the normally closed contact of the relay FR and the live wire, respectively, so that the emergency stop button S3 is pressed to be opened in case of emergency, thereby playing a role of protecting the circuit.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a three-phase asynchronous motor's step-down start-up system, its includes three-phase asynchronous motor and power module, and three-phase asynchronous motor is including step-down start-up wiring end and high-pressure operation wiring end, step-down start-up wiring end and high-pressure operation wiring end all with power module electric connection, its characterized in that: also comprises a voltage reduction starting power supply control circuit and a power supply delay connection unit, wherein,
the voltage reduction starting power supply control circuit comprises a voltage reduction starting power supply control circuit and a high-voltage operation power supply control circuit, and the voltage reduction starting power supply control circuit and the high-voltage operation power supply control circuit are in signal connection with the power supply module;
the voltage reduction starting power supply control circuit is electrically connected with the high-voltage operation power supply control circuit;
the power supply delay switch-on unit is provided with a switch control part and a switch part, wherein the switch control part is in signal connection with the switch part and is electrically connected with the high-voltage operation power supply control circuit.
2. A step-down starting system for a three-phase asynchronous motor according to claim 1, wherein: the power supply module comprises a main contact of a contactor KM1, a main contact of a contactor KM2, a main contact of a contactor KM3 and a three-phase power supply, wherein,
the main contact of the contactor KM1 and the main contact of the contactor KM3 are in signal connection with a voltage reduction starting power supply control circuit; two ends of a main contact of the contactor KM1 are respectively and electrically connected with a voltage reduction starting terminal and a three-phase power supply;
one end of a main contact of the contactor KM3 is electrically connected with the high-voltage operation wiring terminal, and the other end of the main contact is in short circuit;
the main contact of the contactor KM2 is in signal connection with a control circuit of a high-voltage operation power supply, and two ends of the contactor KM2 are respectively electrically connected with a high-voltage operation terminal and a three-phase power supply.
3. A step-down starting system for a three-phase asynchronous motor according to claim 2, wherein: the step-down starting power supply control circuit comprises a coil of a contactor KM1, a coil of a contactor KM3 and a starting button S1, wherein,
the coil of the contactor KM1 is connected with the coil of the contactor KM3 in parallel and electrically connected with a zero line;
one end of the start button S1 is electrically connected with the coil of the contactor KM1 and the coil of the contactor KM3 respectively, and the other end is electrically connected with a live wire.
4. A step-down starting system for a three-phase asynchronous motor according to claim 3, wherein: the voltage-reducing starting power supply control circuit also comprises a relay KT coil and a relay KT normally closed contact, wherein,
the relay KT coil is connected with the relay KT normally closed contact in parallel, and two ends of the relay KT coil are respectively and electrically connected with the starting button S1 and the zero line;
the relay KT normally closed contact is connected in series with the coil of the contactor KM3, and two ends of the relay KT normally closed contact are respectively and electrically connected with the starting button S1 and the coil of the contactor KM 3.
5. A step-down starting system for a three-phase asynchronous motor according to claim 4, wherein: the step-down starting power supply control circuit also comprises an auxiliary normally closed contact of a contactor KM2 and an auxiliary normally open contact of a contactor KM3, wherein,
one end of an auxiliary normally closed contact of the contactor KM2 is electrically connected with the starting button S1, and the other end of the auxiliary normally closed contact of the relay KT is electrically connected with the normally closed contact of the relay KT, the coil of the relay KT and an auxiliary normally open contact of the contactor KM3 respectively;
the auxiliary normally open contact of the contactor KM3 is connected with the coil of the contactor KM1 in series, and the auxiliary normally open contact of the contactor KM3, the coil of the contactor KM1, the high-voltage operation power supply control circuit and the switch control part are electrically connected with each other.
6. A step-down starting system for a three-phase asynchronous motor according to claim 5, wherein: the switch control part is a contactor KM4 coil, the switch part is an auxiliary normally open contact of a contactor KM4, and the contactor KM4 coil and the auxiliary normally open contact of the contactor KM4 are connected in parallel in a high-voltage operation power supply control circuit.
7. A step-down starting system for a three-phase asynchronous motor according to claim 6, wherein: the high-voltage operation power supply control circuit comprises a coil of a contactor KM2, an auxiliary normally open contact of a contactor KM1 and an auxiliary normally closed contact of a contactor KM3, wherein,
a coil of the contactor KM2 is connected in series with an auxiliary normally open contact of the contactor KM4, and an auxiliary normally open contact of the contactor KM1, an auxiliary normally closed contact of the contactor KM3 and a coil of the contactor KM4 are sequentially connected in series;
the coil of the contactor KM2 and the coil of the contactor KM4 are both electrically connected with a zero line, and the auxiliary normally open contact of the contactor KM1 and the auxiliary normally open contact of the contactor KM4 are both electrically connected with a live line;
the auxiliary normally open contact of the contactor KM1 is connected in series with the coil of the contactor KM1, and is connected in parallel with the auxiliary normally open contact of the contactor KM3 and the coil of the contactor KM 4.
8. A step-down starting system for a three-phase asynchronous motor according to claim 1, wherein: the relay FR normally-closed contact is characterized by also comprising an overload protection module, wherein the overload protection module comprises a relay FR heating unit and a relay FR normally-closed contact; two ends of the FR heating unit of the relay are respectively and electrically connected with the power supply module and the voltage reduction starting terminal; and two ends of the FR normally closed contact of the relay are respectively and electrically connected with the voltage-reducing starting power supply control circuit and the live wire.
9. A step-down starting system for a three-phase asynchronous motor according to claim 8, wherein: the voltage reduction starting power supply control circuit further comprises a stop button S2, the stop button S2 is connected with the FR normally closed contact of the relay in series, one end of the stop button is electrically connected with the FR normally closed contact of the relay, and the other end of the stop button is electrically connected with the voltage reduction starting power supply control circuit and the high-voltage operation power supply control circuit respectively.
10. A step-down starting system for a three-phase asynchronous motor as defined in claim 9, wherein: the voltage reduction starting power supply control circuit further comprises an emergency stop button S3, and two ends of the emergency stop button S3 are electrically connected with a fire wire and a normally closed contact of a relay FR respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122053071.6U CN215646646U (en) | 2021-08-27 | 2021-08-27 | Three-phase asynchronous motor's step-down starting system |
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| CN202122053071.6U CN215646646U (en) | 2021-08-27 | 2021-08-27 | Three-phase asynchronous motor's step-down starting system |
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