A star-delta control circuit
By introducing intermediate relays and parallel control circuits into the star triangle control circuit, the problem of contact sticking damage is solved, and a low-cost and high-efficiency control circuit design is achieved.
Patent Information
- Application Number
- CN202421469198.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-06-25
AI Technical Summary
In conventional star triangle control circuits, the auxiliary contacts of the contactor are easily stuck and damaged due to long-term use, resulting in high replacement costs and affecting production.
The intermediate relay is used to connect the star-type operation control circuit and the triangular operation control circuit in parallel, and combine it with a normally closed switch, a normally open switch and a circuit breaker to form a general control circuit to reduce dependence on the contactor.
It reduces the economic cost of the control circuit, extends the service life of the equipment, maximizes manpower and material resources, and significantly improves production efficiency.
Smart Images
Figure CN222750346U_ABST
Abstract
Description
Technical field:
[0001] The utility model relates to the technical field of circuit equipment, in particular to a star-delta control circuit. Background technology:
[0002] Contactors are commonly used in conventional star-delta control circuits. The auxiliary contacts of contactors are frequently used in control. Due to long-term use, the contacts often become sticky. After damage, the economic cost of replacement is relatively high, which is time-consuming and labor-intensive, and seriously affects production. Utility model content:
[0003] The utility model aims to provide a star-delta control circuit with lower economic cost.
[0004] The utility model is implemented by the following technical scheme: a star-delta control circuit, which includes a main circuit, which also includes a star-type operation control circuit and a delta-type operation control circuit;
[0005] After the star-shaped operation control circuit and the delta-shaped operation control circuit are connected in parallel, they are connected in series with the normally closed switch SB1 and the normally open switch SB2 to form a total control circuit. The normally open auxiliary contact of the intermediate relay KA1 is connected in parallel to the normally open switch SB2. The circuit breaker QF1 is also connected in series to the total control circuit.
[0006] The star-type operation control circuit includes a first circuit, a second circuit, and a third circuit connected in parallel. The coil of the main contactor KM1 is connected in parallel with the coil of the intermediate relay KA1 to form the first circuit; the coil of the star contactor KM3 is connected in parallel with the coil of the intermediate relay KA3 and then connected in series with the normally closed auxiliary contact of the intermediate relay KA2 to form the second circuit, and the coil of the time relay KT is connected in series with the normally closed auxiliary contact of the intermediate relay KA4 to form the third circuit;
[0007] The triangle operation control circuit includes a fourth circuit and a fifth circuit connected in parallel, the fourth circuit includes a series-connected intermediate relay KA2 coil and a first normally open auxiliary contact of the intermediate relay KA2, and a delayed closing contact of the time relay KT is connected in parallel to the first normally open auxiliary contact of the intermediate relay KA2; the fifth circuit includes a series-connected second normally open auxiliary contact of the intermediate relay KA2, a normally closed auxiliary contact of the intermediate relay KA3 and a triangle contactor KM2 coil, and an intermediate relay KA4 coil is connected in parallel to the triangle contactor KM2 coil.
[0008] Furthermore, a normally closed auxiliary contact of a thermal relay FR is connected in series with the normally closed switch SB1.
[0009] Furthermore, the main circuit includes a main relay QF connected in series, a normally open main contact of a main contactor KM1 and a coil of a thermal relay FR, the coil of the thermal relay FR is connected to the three lead ends of the three-phase winding coil of the motor M, the three lead tail ends of the three-phase winding coil of the motor M are connected to the normally open main contact of a star contactor KM3, and the six leads of the three-phase winding coil of the motor M are connected to the normally open main contacts of a delta contactor KM2.
[0010] Advantages of the utility model: Compared with the prior art, the utility model adopts an intermediate relay in the control circuit, which has low economic cost, significant effect, high practical value, and saves manpower and material resources to the greatest extent. Description of the drawings:
[0011] Figure 1 It is a schematic diagram of the main circuit of the utility model.
[0012] Figure 2 It is a schematic diagram of the overall control loop of the utility model.
[0013] The components in the accompanying drawings are marked as follows: main circuit 1, star operation control circuit 2, delta operation control circuit 3, total control circuit 4, first circuit 5, second circuit 6, third circuit 7, fourth circuit 8, fifth circuit 9. Specific implementation method:
[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0015] like Figure 1 and Figure 2 As shown, this embodiment provides a star-delta control circuit, which includes a main circuit 1, the main circuit 1 includes a main relay QF connected in series, a normally open main contact of a main contactor KM1 and a coil of a thermal relay FR, the coil of the thermal relay FR is connected to the three lead head ends of the three-phase winding coil of the motor M, the three lead tail ends of the three-phase winding coil of the motor M are connected to the normally open main contact of the star contactor KM3, and the normally open main contact of the delta contactor KM2 is connected between the three lead head ends and the three lead tail ends of the three-phase winding coil of the motor M.
[0016] It also includes a star-type operation control circuit 2 and a delta-type operation control circuit 3; after the star-type operation control circuit 2 and the delta-type operation control circuit 3 are connected in parallel, they are connected in series with the normally closed switch SB1 and the normally open switch SB2 to form a total control circuit 4, the normally open switch SB2 is connected in parallel with the normally open auxiliary contact of the intermediate relay KA1, the total control circuit 4 is also connected in series with the circuit breaker QF1, and the normally closed auxiliary contact of the thermal relay FR is connected in series with the normally closed switch SB1; the star-type operation control circuit 2 includes a first circuit 5, a second circuit 6, and a third circuit 7 connected in parallel, the main contactor KM1 coil and the intermediate relay KA1 coil are connected in parallel to form the first circuit 5; the star contactor KM3 coil and the intermediate relay KA3 coil are connected in parallel, and the normally closed auxiliary contact of the intermediate relay KA2 is connected in series with the normally closed auxiliary contact of the thermal relay FR. The contacts are connected in series to form the second circuit 6, and the coil of the time relay KT and the normally closed auxiliary contacts of the intermediate relay KA4 are connected in series to form the third circuit 7; close the circuit breakers QF and QF1, press the normally open switch SB2, the coil of the intermediate relay KA1 is energized, and the normally open auxiliary contacts of the intermediate relay KA1 are closed and self-locked. At the same time, the coil of the main contactor KM1 is energized, and the normally open main contacts of the main contactor KM1 are closed. The coil of the star contactor KM3, the coil of the intermediate relay KA3, and the coil of the time relay KT are all energized, and the time relay KT starts timing, the normally open main contacts of the star contactor KM3 on the main circuit 1 are closed, and the motor M starts to enter the star operation state; at the same time, the normally closed auxiliary contacts of the intermediate relay KA3 on the delta operation control circuit 3 are disconnected.
[0017] The delta operation control circuit 3 includes a fourth circuit 8 and a fifth circuit 9 connected in parallel. The fourth circuit 8 includes a series-connected intermediate relay KA2 coil and a first normally open auxiliary contact of the intermediate relay KA2, and a delayed closing contact of a time relay KT is connected in parallel to the first normally open auxiliary contact of the intermediate relay KA2; the fifth circuit 9 includes a series-connected second normally open auxiliary contact of the intermediate relay KA2, a normally closed auxiliary contact of the intermediate relay KA3 and a delta contactor KM2 coil, and an intermediate relay KA4 coil is connected in parallel to the delta contactor KM2 coil; when the time relay KT reaches the set time, the delayed closing contact of the time relay KT is closed, and the intermediate relay KA2 coil When energized, the first normally open auxiliary contact of the intermediate relay KA2 closes and self-locks, the normally closed auxiliary contact of the intermediate relay KA2 on the star operation control circuit 2 is disconnected, the star contactor KM3 coil and the intermediate relay KA3 coil are both de-energized, and the normally open main contact of the star contactor KM3 is disconnected. At the same time, the second normally open auxiliary contact of the intermediate relay KA2 and the normally closed auxiliary contact of the intermediate relay KA3 are both closed, the triangle contactor KM2 coil and the intermediate relay KA4 coil are energized, the normally open main contact of the triangle contactor KM2 is closed, and the motor M starts to enter the triangle operation state; at the same time, the normally closed auxiliary contact of the intermediate relay KA4 is disconnected, the time relay KT coil is de-energized, and the timing is stopped.
[0018] When the normally closed switch SB1 is pressed, the coil of the main contactor KM1 loses power, the normally open main contact of the main contactor KM1 is disconnected, the main circuit 1 is powered off, and the motor stops. The utility model adopts an intermediate relay in the control circuit, which has low economic cost, significant effect, high practical value, and saves manpower and material resources to the maximum extent.
[0019] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A star-delta control circuit, comprising a main circuit, characterized in that: It also includes a star operation control loop and a delta operation control loop; After the star-shaped operation control circuit and the delta-shaped operation control circuit are connected in parallel, they are connected in series with the normally closed switch SB1 and the normally open switch SB2 to form a total control circuit. The normally open auxiliary contact of the intermediate relay KA1 is connected in parallel to the normally open switch SB2. The circuit breaker QF1 is also connected in series to the total control circuit. The star-type operation control circuit includes a first circuit, a second circuit, and a third circuit connected in parallel. The coil of the main contactor KM1 is connected in parallel with the coil of the intermediate relay KA1 to form the first circuit; the coil of the star contactor KM3 is connected in parallel with the coil of the intermediate relay KA3 and then connected in series with the normally closed auxiliary contact of the intermediate relay KA2 to form the second circuit, and the coil of the time relay KT is connected in series with the normally closed auxiliary contact of the intermediate relay KA4 to form the third circuit; The triangle operation control circuit includes a fourth circuit and a fifth circuit connected in parallel, the fourth circuit includes a series-connected intermediate relay KA2 coil and a first normally open auxiliary contact of the intermediate relay KA2, and a delayed closing contact of the time relay KT is connected in parallel to the first normally open auxiliary contact of the intermediate relay KA2; the fifth circuit includes a series-connected second normally open auxiliary contact of the intermediate relay KA2, a normally closed auxiliary contact of the intermediate relay KA3 and a triangle contactor KM2 coil, and an intermediate relay KA4 coil is connected in parallel to the triangle contactor KM2 coil.
2. A star-delta control circuit according to claim 1, characterized in that: The normally closed auxiliary contact of the thermal relay FR is connected in series with the normally closed switch SB1.
3. A star-delta control circuit according to claim 1, characterized in that: The main circuit includes a main relay QF connected in series, a normally open main contact of a main contactor KM1 and a coil of a thermal relay FR. The coil of the thermal relay FR is connected to the three lead ends of the three-phase winding coil of the motor M, the three lead tail ends of the three-phase winding coil of the motor M are connected to the normally open main contact of a star contactor KM3, and the six leads of the three-phase winding coil of the motor M are connected to the normally open main contacts of a delta contactor KM2.