Motor positive and negative rotation control system

Abstract

The utility model discloses a motor forward and reverse rotation control system, which comprises a motor M3, a main switch QF, a forward rotation contactor KM1, a thermal relay FR, a reverse rotation contactor KM2, a main control switch QF1, a start permission circuit, a stop permission circuit, a start loop, a stop loop, a forward rotation loop, a reverse rotation loop and an execution loop, a three-phase power line of the motor M3 is sequentially connected in series with a main switch QF, a normally open contact of a forward contactor KM1 and a thermal relay FR and then is connected to the motor M3, and two ends of the normally open contact of the forward contactor KM1 are connected to a normally open contact of a reverse contactor KM2 in a commutation manner; a second phase line L2 of the three-phase power line between the main switch QF and the normally open contact of the forward contactor KM1 is connected to a live wire L, and the main control switch QF1 is connected to the live wire L in series; and a starting permission circuit, a stopping permission circuit, a starting loop, a stopping loop, a forward rotation loop, a reverse rotation loop and an execution loop are connected in parallel between the live wire L and the null line N.

Description

Technical field:

[0001] The utility model relates to the technical field of motor control, in particular to a motor forward and reverse rotation control system. Background technology:

[0002] Conventional motor forward and reverse control circuits often have a forward start button, a reverse start button and a stop button at the same time. There are many buttons. Due to poor visibility at night, operators often confuse the start button and the stop button, and the forward start button and the reverse start button, which is not conducive to operation and delays production. Utility model content:

[0003] The utility model aims to provide a motor forward and reverse rotation control system.

[0004] The purpose of the utility model is implemented by the following technical solutions: a motor forward and reverse control system, which includes a motor M3, a main switch QF, a forward contactor KM1, a thermal relay FR, a reverse contactor KM2, a main control switch QF1, a start-allowing circuit, a stop-allowing circuit, a start circuit, a stop circuit, a forward circuit, a reverse circuit and an execution circuit;

[0005] The three-phase power line of the motor M3 is connected in series with the main switch QF, the normally open contact of the forward contactor KM1, the thermal relay FR and then the motor M3. The two ends of the normally open contact of the forward contactor KM1 are connected in phase to the normally open contact of the reverse contactor KM2; the second phase line L2 of the three-phase power line between the main switch QF and the normally open contact of the forward contactor KM1 is connected to the live wire L, and the main control switch QF1 is connected in series to the live wire L; the start permission circuit, the stop permission circuit, the start circuit, the stop circuit, the forward circuit, the reverse circuit and the execution circuit are connected in parallel between the live wire L and the neutral wire N.

[0006] Preferably, the normally closed contact of the third relay KA3, the normally closed contact of the first relay KA1 and the start-permitting indicator light HL1 are connected in series to form the start-permitting circuit; the normally open contact of the third relay KA3, the normally closed contact of the second relay KA2 and the stop-permitting indicator light HL2 are connected in series to form the stop-permitting circuit;

[0007] After the button SB, the normally closed contact of the third relay KA3, the coil of the first relay KA1, and the normally closed contact of the second relay KA2 are connected in series, the normally open contacts of the first relay KA1 are connected in parallel at both ends of the normally closed contact of the third relay KA3 to form the start circuit; after the button SB, the normally open contact of the third relay KA3, the coil of the second relay KA2, and the normally closed contact of the first relay KA1 are connected in series, the normally open contacts of the second relay KA2 are connected in parallel at both ends of the normally open contact of the third relay KA3 to form the stop circuit;

[0008] The normally open contact of the third relay KA3, the conversion switch SA, the normally closed contact of the reversing contactor KM2, and the coil of the forward contactor KM1 are connected in series to form the forward circuit, and the two ends of the series circuit between the normally closed contact of the reversing contactor KM2 and the coil of the forward contactor KM1 are connected in parallel with a forward indicator light HL3; the normally open contact of the third relay KA3, the conversion switch SA, the normally closed contact of the forward contactor KM1, and the coil of the reversing contactor KM2 are connected in series to form the reversing circuit, and the two ends of the series circuit between the normally closed contact of the forward contactor KM1 and the coil of the reversing contactor KM2 are connected in parallel with a reversing indicator light HL4;

[0009] The normally closed contact of the thermal relay FR, the normally closed contact of the second relay KA2, the normally open contact of the first relay KA1, and the coil of the third relay KA3 are connected in series, and the normally open contact of the third relay KA3 is connected in parallel at both ends of the normally open contact of the first relay KA1 to form the execution loop.

[0010] Preferably, one of the moving contacts of the conversion switch SA is connected to the normally closed contact of the reversing contactor KM2 in the forward circuit, the other moving contact of the conversion switch SA is connected to the normally closed contact of the forward contactor KM1 in the reversing circuit, and the common contact of the conversion switch SA is connected to the normally open contact of the third relay KA3.

[0011] Advantages of the utility model: First, the utility model is provided with a start-allowing circuit, a stop-allowing circuit, a start loop, a stop loop, a forward loop, a reverse loop and an execution loop in parallel between the live wire L and the neutral wire N; wherein the start loop and the stop loop are controlled by a button SB, and cooperate with the execution loop to realize the start and stop of the motor, and the surface design of the box is simple, which avoids the situation that the operator confuses the start button and the stop button, the forward start button and the reverse start button, etc.; the forward loop and the reverse loop are switched by the conversion switch SA to realize the forward and reverse rotation of the motor, and the motor running status is clearly indicated by the forward indicator light HL3 and the reverse indicator light HL4; the start-allowing indicator light HL1 and the stop-allowing indicator light HL2 are respectively designed in the start-allowing circuit and the stop-allowing circuit, and the indication is clear, the probability of misoperation is reduced, and it is safe and stable.

[0012] Second, the utility model connects the normally open contact of the first relay KA1 in the start circuit and the normally open contact of the second relay KA2 in the stop circuit as self-locking contacts, respectively, and connects the normally closed contact of the second relay KA2 in the start circuit and the normally closed contact of the first relay KA1 in the stop circuit as interlocking contacts; when the start circuit is working, the coil of the first relay KA1 is energized, the normally open contact of the first relay KA1 is closed to form a self-locking, and the normally closed contact of the first relay KA1 is disconnected to cut off the stop circuit; when the stop circuit is working, the coil of the second relay KA2 is energized, the normally open contact of the second relay KA2 is closed to form a self-locking, and the normally closed contact of the second relay KA2 is disconnected to cut off the start circuit, thereby realizing the interlocking function and avoiding mutual influence between the start circuit and the stop circuit. Description of the drawings:

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creativity and labor.

[0014] Figure 1 It is a circuit diagram of the main control circuit in the utility model.

[0015] Figure 2 It is a circuit diagram of the main circuit in the utility model.

[0016] The markings of the components in the accompanying drawings are as follows: motor M3, main switch QF, forward contactor KM1, thermal relay FR, reverse contactor KM2, live wire L, main control switch QF1, neutral wire N, start permission circuit 1, stop permission circuit 2, start circuit 3, stop circuit 4, forward circuit 5, reverse circuit 6, execution circuit 7, first relay KA1, second relay KA2, third relay KA3, start permission indicator light HL1, stop permission indicator light HL2, button SB, conversion switch SA, forward indicator light HL3, reverse indicator light HL4. Specific implementation method:

[0017] 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 of 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.

[0018] like Figure 1-Figure 2 As shown, a motor forward and reverse control system includes a motor M3, a main switch QF, a forward contactor KM1, a thermal relay FR, a reverse contactor KM2, a main control switch QF1, a start-allowing circuit 1, a stop-allowing circuit 2, a start circuit 3, a stop circuit 4, a forward circuit 5, a reverse circuit 6 and an execution circuit 7; wherein the three-phase power line of the motor M3 is sequentially connected in series to the main switch QF, the normally open contact of the forward contactor KM1, and the thermal relay FR, and then connected to the motor M3, and the two ends of the normally open contact of the forward contactor KM1 are connected to the normally open contact of the reverse contactor KM2 in phase change, forming the main circuit of the motor forward and reverse control system, and the main circuit is the prior art; the second phase line L2 of the three-phase power line between the main switch QF and the normally open contact of the forward contactor KM1 is connected to the live wire L, and the main control switch QF1 is connected in series to the live wire L;

[0019] A start-permitting circuit 1, a stop-permitting circuit 2, a start circuit 3, a stop circuit 4, a forward circuit 5, a reverse circuit 6 and an execution circuit 7 are connected in parallel between the live wire L and the neutral wire N;

[0020] The normally closed contact of the third relay KA3, the normally closed contact of the first relay KA1 and the start permission indicator light HL1 are connected in series to form a start permission circuit 1. When the start permission indicator light HL1 is on, the button SB is allowed to be pressed to connect the start circuit 3;

[0021] The normally open contact of the third relay KA3, the normally closed contact of the second relay KA2 and the stop permission indicator light HL2 are connected in series to form a stop permission circuit 2. When the stop permission indicator light HL2 is on, the button SB is allowed to be pressed to connect the stop circuit 4.

[0022] After the button SB, the normally closed contact of the third relay KA3, the coil of the first relay KA1, and the normally closed contact of the second relay KA2 are connected in series, the normally open contacts of the first relay KA1 are connected in parallel at both ends of the normally closed contact of the third relay KA3 to form a start circuit 3; after the button SB, the normally open contact of the third relay KA3, the coil of the second relay KA2, and the normally closed contact of the first relay KA1 are connected in series, the normally open contacts of the second relay KA2 are connected in parallel at both ends of the normally open contact of the third relay KA3 to form a stop circuit 4;

[0023] When the start circuit 3 is working, if the operator makes an error operation and presses the button SB without releasing it, the normally open contact of the first relay KA1 is set as a self-locking contact, and the normally closed contact of the second relay KA2 is set as an interlocking contact, which can avoid the situation where the stop circuit 4 is immediately connected after the start circuit 3 is connected. The specific reasons are as follows: when the button SB is pressed and not released, the coil of the first relay KA1 is energized, so that the normally open contact of the first relay KA1 is closed, forming a self-locking, and the normally closed contact of the first relay KA1 is disconnected to cut off the stop circuit 4, avoiding affecting the operation of the start circuit 3;

[0024] When the stop circuit 4 is working, if the operator makes an error operation and presses the button SB without releasing it, the normally open contact of the second relay KA2 is set as a self-locking contact, and the normally closed contact of the first relay KA1 is set as an interlocking contact, which can avoid the situation where the start circuit 3 is immediately connected after the stop circuit 4 is connected. The specific reasons are as follows: when the button SB is pressed and not released, the coil of the second relay KA2 is energized, so that the normally open contact of the second relay KA2 is closed, forming a self-locking, and the normally closed contact of the second relay KA2 is disconnected to cut off the start circuit 3, avoiding affecting the operation of the stop circuit 4;

[0025] The normally open contact of the third relay KA3, the conversion switch SA, the normally closed contact of the reversing contactor KM2, and the coil of the forward contactor KM1 are connected in series to form a forward loop 5. When the conversion switch SA is turned to the forward position, the normally open contact of the third relay KA3 is closed, the forward loop 5 is connected, and the motor M3 rotates forward; the forward indicator light HL3 is connected in parallel to both ends of the series circuit of the normally closed contact of the reversing contactor KM2 and the coil of the forward contactor KM1. When the normally open contact of the third relay KA3 is closed and the forward loop 5 is connected, the forward indicator light HL3 lights up, indicating that the motor M3 is in the forward state;

[0026] The normally open contact of the third relay KA3, the conversion switch SA, the normally closed contact of the forward contactor KM1, and the coil of the reverse contactor KM2 are connected in series to form a reverse circuit 6. When the conversion switch SA is turned to the reverse position, the normally open contact of the third relay KA3 is closed, the reverse circuit 6 is connected, and the motor M3 is reversed; the reverse indicator light HL4 is connected in parallel to both ends of the series circuit of the normally closed contact of the forward contactor KM1 and the coil of the reverse contactor KM2. When the normally open contact of the third relay KA3 is closed and the reverse circuit 6 is connected, the reverse indicator light HL4 lights up, indicating that the motor M3 is in a reverse state;

[0027] One of the moving contacts of the conversion switch SA is connected to the normally closed contact of the reversing contactor KM2 in the forward circuit 5, the other moving contact of the conversion switch SA is connected to the normally closed contact of the forward contactor KM1 in the reversing circuit 6, the common contact of the conversion switch SA is connected to the normally open contact of the third relay KA3, and the forward and reversing circuit 6 is switched by the conversion switch SA to control the forward and reversing of the motor;

[0028] The normally closed contact of the thermal relay FR, the normally closed contact of the second relay KA2, the normally open contact of the first relay KA1, and the coil of the third relay KA3 are connected in series, and the normally open contact of the third relay KA3 is connected in parallel to both ends of the normally open contact of the first relay KA1 to form an execution loop 7;

[0029] When the normally open contact of the first relay KA1 is instantaneously attracted, the coil of the third relay KA3 is energized and the normally open contact of the third relay KA3 is closed. Even if the normally open contact of the closed first relay KA1 is opened again, the normally open contact of the third relay KA3 is still closed, and the circuit can continue to be powered, achieving self-locking.

[0030] Working principle: Close the main control switch QF1 and turn the conversion switch SA to the forward position. At this time, the start circuit 1 is allowed to be connected, the start indicator light HL1 is allowed to light up, and the button SB is allowed to be pressed;

[0031] When the button SB is pressed, the start circuit 3 is instantly connected, the coil of the first relay KA1 is energized and attracted, and drives the normally open contact of the first relay KA1 to be attracted, the coil of the third relay KA3 in the execution circuit 7 is energized and attracted, and drives the normally open contact of the third relay KA3 to be attracted, the forward circuit 5 is connected, the motor M3 rotates forward, and at the same time, the forward indicator light HL3 lights up; after releasing the button SB, since the normally open contact of the third relay KA3 is closed and connected to the power supply line of the coil of the third relay KA3, the coil of the third relay KA3 is still attracted and self-locked, and the motor M3 still runs forward; at the same time, the normally closed contact of the third relay KA3 is disconnected, the start circuit 1 is allowed to be disconnected, the stop circuit 2 is allowed to be connected, and the stop indicator light HL2 is allowed to light up;

[0032] When the forward indicator light HL3 and the stop indicator light HL2 are lit at the same time, press the button SB again, the stop circuit 4 is instantly connected, the coil of the second relay KA2 is energized and drives the normally closed contact of the second relay KA2 to open, the coil of the third relay KA3 in the execution circuit 7 loses power, the execution circuit 7 is cut off, the normally open contact of the third relay KA3 that has been closed is opened, the forward circuit 5 is cut off, and the motor M3 stops running; at the same time, the normally closed contact of the disconnected third relay KA3 is closed, the start circuit 1 is allowed to be connected, the start indicator light HL1 is allowed to light up, the stop circuit 2 is allowed to be disconnected, and the stop indicator light HL2 is allowed to go out;

[0033] Turn the conversion switch SA to the reverse position and repeat the above steps. The difference from the above process is that: "forward circuit 5 is connected, motor M3 rotates forward" becomes "reverse circuit 6 is connected, motor M3 rotates reversely".

[0034] The above are only preferred embodiments of the present invention and are 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 motor forward and reverse control system, comprising a motor M3, a main switch QF, a forward contactor KM1, a thermal relay FR, a reverse contactor KM2, a main control switch QF1, a start-allowing circuit, a stop-allowing circuit, a start circuit, a stop circuit, a forward circuit, a reverse circuit and an execution circuit; The three-phase power line of the motor M3 is connected in series with the main switch QF, the normally open contact of the forward contactor KM1, and the thermal relay FR in sequence, and then connected to the motor M3. The two ends of the normally open contact of the forward contactor KM1 are connected to the normally open contact of the reverse contactor KM2 in phase change; it is characterized in that: The second phase line L2 of the three-phase power line between the main switch QF and the normally open contact of the forward contactor KM1 is connected to the live wire L, and the main control switch QF1 is connected in series to the live wire L; the start permission circuit, the stop permission circuit, the start circuit, the stop circuit, the forward circuit, the reverse circuit and the execution circuit are connected in parallel between the live wire L and the neutral wire N.

2. A motor forward and reverse control system according to claim 1, characterized in that: The normally closed contact of the third relay KA3, the normally closed contact of the first relay KA1 and the start-permitting indicator light HL1 are connected in series to form the start-permitting circuit; the normally open contact of the third relay KA3, the normally closed contact of the second relay KA2 and the stop-permitting indicator light HL2 are connected in series to form the stop-permitting circuit; Button SB, normally closed contact of the third relay KA3, coil of the first relay KA1, After the normally closed contacts of the second relay KA2 are connected in series, the normally open contacts of the first relay KA1 are connected in parallel at both ends of the normally closed contacts of the third relay KA3 to form the start circuit; after the button SB, the normally open contact of the third relay KA3, the coil of the second relay KA2, and the normally closed contact of the first relay KA1 are connected in series, the normally open contacts of the second relay KA2 are connected in parallel at both ends of the normally open contacts of the third relay KA3 to form the stop circuit; The normally open contact of the third relay KA3, the conversion switch SA, the normally closed contact of the reversing contactor KM2, and the coil of the forward contactor KM1 are connected in series to form the forward circuit, and the two ends of the series circuit between the normally closed contact of the reversing contactor KM2 and the coil of the forward contactor KM1 are connected in parallel with a forward indicator light HL3; the normally open contact of the third relay KA3, the conversion switch SA, the normally closed contact of the forward contactor KM1, and the coil of the reversing contactor KM2 are connected in series to form the reversing circuit, and the two ends of the series circuit between the normally closed contact of the forward contactor KM1 and the coil of the reversing contactor KM2 are connected in parallel with a reversing indicator light HL4; The normally closed contact of the thermal relay FR, the normally closed contact of the second relay KA2, the normally open contact of the first relay KA1, and the coil of the third relay KA3 are connected in series, and the normally open contact of the third relay KA3 is connected in parallel at both ends of the normally open contact of the first relay KA1 to form the execution loop.

3. A motor forward and reverse control system according to claim 2, characterized in that: One of the moving contacts of the conversion switch SA is connected to the normally closed contact of the reversing contactor KM2 in the forward circuit, the other moving contact of the conversion switch SA is connected to the normally closed contact of the forward contactor KM1 in the reversing circuit, and the common contact of the conversion switch SA is connected to the normally open contact of the third relay KA3.

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