CN115864898A - Motor control system - Google Patents

Abstract

The disclosure relates to a motor control system, which comprises a power module, a control module and a motor, wherein the power module is used for supplying power to the control module and the motor; the control module includes: the switch module is connected with a live wire of the power supply module and used for providing a switch signal; the coil of the double-position relay is connected in series between the switch module and the zero line of the power module, and the double-position relay is switched on or tripped under the control of a switch signal of the switch module; and a coil of the contactor is connected between a live wire and a zero line of the power module and is connected in parallel with a series branch of the double-position relay and the switch module, and the contactor is used for controlling the motor to start or stop running. By the technical scheme, the motor can be controlled to start or stop running, and the working efficiency of the motor is improved.

Description

Motor control system

Technical Field

The present disclosure relates to the field of motor control, and in particular, to a motor control system.

Background

The low-voltage motor controlled by the alternating current contactor is adopted, when a working power supply is subjected to low-voltage ride-through and interference, the alternating current contactor can trip due to low voltage of a coil, and an existing interference self-starting loop control system cannot be switched on within a set interference self-starting time range after the motor trips, so that potential safety hazards of the system are easily caused.

Disclosure of Invention

The present disclosure is directed to a motor control system, which may solve a problem that an existing motor cannot be immediately switched on after a normal trip operation due to a self-starting circuit of a power dazzling.

In order to achieve the above object, in a first aspect of the present disclosure, a motor control system is provided, where the motor control system includes a power module, a control module, and a motor, the power module is configured to supply power to the control module and the motor, and the control module is configured to control the motor to start or stop operating; wherein the control module comprises:

the switch module is connected with a live wire of the power supply module and used for providing a switch signal;

a coil of the double-position relay is connected in series between the switch module and a zero line of the power module, and the double-position relay is switched on or tripped under the control of a switch signal of the switch module;

and the coil of the contactor is connected between the live wire and the zero wire of the power module and is connected in parallel with the series branch of the double-position relay and the switch module, and the contactor is used for controlling the motor to start or stop running.

Optionally, the switch module comprises a remote local transfer switch, a remote closing switch, a local closing switch, a remote tripping switch and a local tripping switch, and the remote closing switch, the local closing switch, the remote tripping switch and the local tripping switch are respectively connected with the remote local transfer switch;

the distant place change over switch on spot includes first distant place switch, the distant place switch of second, first switch on spot and the switch on spot of second, distant place closing switch with first distant place switch is established ties in order to form first combined floodgate branch road, on spot closing switch with first switch on spot is established ties in order to form second combined floodgate branch road, distant place tripping switch with the distant place switch of second is established ties in order to form first tripping branch road, on spot tripping switch with the second switch on spot is established ties in order to form second tripping branch road.

Optionally, the coil of the dual-position relay includes a closing coil and a tripping coil, the dual-position relay further includes a first normally open contact, a second normally open contact and a first normally closed contact, the first closing branch is connected in parallel with the second closing branch and then connected in series with the closing coil, and the first tripping branch is connected in parallel with the second tripping branch and then connected in series with the tripping coil;

the first normally open contact is arranged on a third tripping branch which is connected with the second tripping branch in parallel;

the second normally open contact is connected between the live wire of the power supply module and the coil of the contactor;

the first normally closed contact is connected between a live wire and a zero wire of the power module, and a branch where the first normally closed contact is located is connected with a branch where a coil of the contactor is located in series with the second normally open contact in parallel.

Optionally, the control module further comprises a time relay comprising a third normally open contact, a second normally closed contact, a fourth normally open contact, and a fifth normally open contact, wherein,

the second normally closed contact is arranged on the third tripping branch and is connected between the first normally open contact and the tripping coil;

the third normally-open contact is connected between the live wire of the power supply module and the second normally-open contact in series; a coil of the time relay is connected in series between the first normally closed contact and a zero line of the power module, and a series branch of the first normally closed contact and the coil of the time relay is connected in parallel with a series branch of the third normally open contact, the second normally open contact and the coil of the contactor;

the fourth normally open contact is connected in series between the confluence ends of the first closing branch and the second closing branch and the closing coil;

the fifth normally open contact is connected between the live wire of the power supply module and the coil of the time relay, and the fifth normally open contact is connected in parallel with the first normally closed contact.

Optionally, the motor control system further comprises a protection module, disposed between the power module and the motor, for tripping to protect the motor when the operating state of the motor satisfies a preset condition.

Optionally, the control module further includes a sixth normally-open contact and a third normally-closed contact linked with the protection module, and when the protection module trips, the sixth normally-open contact is closed and the third normally-closed contact is opened;

the sixth normally-open contact is connected with the second normally-closed contact in parallel, and the third normally-closed contact is connected between the live wire of the power supply module and the third normally-open contact in series.

Optionally, the control module further includes a joint control switch, the joint control switch is connected in series between the third normally closed contact and the third normally open contact, the joint control switch is a normally closed switch, and the joint control switch is used for controlling the motor to stop running.

Optionally, the motor control system further includes a first power switch, one end of the first power switch is connected to the live wire of the power module, and the other end of the first power switch is connected to the protection module and the control module, respectively.

Optionally, the control module further includes a second power switch, one end of the second power switch is connected to the other end of the first power switch, and the other end of the second power switch is connected to the first closing branch, the second closing branch, the first tripping branch, the second tripping branch, the third tripping branch, and the third normally closed contact.

Optionally, the control module further comprises a first indicator light and a second indicator light;

the contactor further comprises a seventh normally open contact and a fourth normally closed contact, the seventh normally open contact is connected in series between the second power switch and one end of the first indicator light, the fourth normally closed contact is connected in series between the second power switch and one end of the second indicator light, and the other end of the first indicator light and the other end of the second indicator light are respectively connected with a zero line of the power module.

Optionally, the contactor further comprises an eighth normally open contact connected in series between the first power switch and the protection module.

Through the technical scheme, after the power supply module is started, the power supply module can normally supply power to the motor and the control module, and a worker can control the whole motor control system through the operation switch module, so that the motor can be started to run and start operation, or stop running and stop operation. The switch module generates a switch signal under the operation of a worker, and the switch signal acts on the double-position relay to control the double-position relay to be switched on or tripped. When the double-position relay is switched on, a coil of the contactor is electrified, the contactor is switched on, and the motor is controlled to start and operate; when the double-position relay trips, the coil of the contactor loses power, the contactor trips, and the motor is controlled to stop running. Through the modular design, the motor is controlled to start or stop running, and the working efficiency of the motor and the safety of a process system are improved.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic structural diagram of a motor control system according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a motor control system according to another embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a monitoring module of a motor control system according to an embodiment of the present disclosure.

Description of the reference numerals

Motor control system 100

Power supply module 1

Control module 2

Switch module 10

Remote and local switch 11

First remote switch 12

Second remote switch 13

First in situ switch 14

Second in-situ switch 15

Remote closing switch 16

On-site closing switch 17

Remote trip switch 18

Local trip switch 19

First closing branch 111

Second closing branch 112

First trip branch 113

Second trip branch 114

Third trip branch 115

Two position relay 20

Closing coil 21

Trip coil 22

First normally open contact 23

Second normally open contact 24

First normally closed contact 25

Tenth normally open contact 26

Sixth normally-closed contact 27

Coil 30 of contactor

The seventh normally open contact 31

Fourth normally closed contact 32

Eighth normally open contact 33

Ninth normally open contact 34

Fifth normally closed contact 35

Eleventh normally open contact 36

A seventh normally closed contact 37

Coil 40 of time relay

Third normally open contact 41

Second normally closed contact 42

Fourth normally open contact 43

Fifth normally open contact 44

Motor 3

Protection module 4

Sixth normally open contact 411

Third normally closed contact 412

First power switch 51

Second power switch 52

First indicator light 53

Second indicator light 54

Joint control switch 55

Monitoring module 5

First monitoring loop 511

Second monitor loop 512

Third monitoring loop 513

Fourth monitor loop 514

Fifth monitor loop 515

First monitor switch 151

Second monitor switch 152

Third monitor switch 153

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

It should be noted that all actions of acquiring signals, information or data in the present disclosure are performed under the premise of complying with the corresponding data protection regulation policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.

The present disclosure provides a motor control system which is applicable to various types of low-voltage motors, for example, type I, II, and III motors in thermal power plants, and realizes control and protection of the low-voltage motors.

Fig. 1 is a schematic structural diagram of a motor control system according to an embodiment of the present disclosure. As shown in fig. 1, the motor control system 100 may include a power module 1, a control module 2, and a motor 3, where the power module 1 is configured to supply power to the control module 2 and the motor 3, the control module 2 is configured to control the motor 3 to start or stop running, and the motor 3 is configured to convert electrical energy into mechanical energy for performing work. Wherein, power module 1 can include stand-by power supply, for example, emergent diesel generator, can switch to stand-by power supply when the main power supply in power module 1 breaks down and can't provide the electric power that can normally work to control module 2 and motor 3, for control module 2 and motor 3 power supply, in time adjust motor 3's operating condition.

As shown in fig. 1, the control module 2 may include: the circuit comprises a switch module 10, a two-position relay 20 and a contactor, wherein the switch module 10 is connected with a live wire of a power module 1 and used for providing a switch signal. The coil of the two-position relay 20 is connected in series between the zero line of the switch module 10 and the power module 1, and the two-position relay 20 is switched on or tripped under the control of the switching signal of the switch module 10. The coil 30 of the contactor is connected between the live wire and the zero wire of the power module 1, and is connected in parallel with the series branch of the two-position relay 20 and the switch module 10, and the contactor is used for controlling the motor 3 to start or stop running.

With the circuit arrangement, after the power module 1 is started, the power module 1 can normally provide the electric power required by normal operation for the motor 3 and the control module 2, and a worker can control the whole motor control system 100 by operating the switch module 10, so that the motor 3 can start operation and start operation, or stop operation and stop operation. The switching module 10 is operable by a worker to generate a switching signal that is applied to the two-position relay 20 to control the two-position relay to close or trip. When the double-position relay 20 is switched on, the coil 30 of the contactor is electrified, the contactor is switched on, and the motor 3 is controlled to start and operate; when the two-position relay 20 is tripped, the coil 30 of the contactor loses power, the contactor trips, and the motor 3 is controlled to stop running. Through the modular design, the motor 3 is controlled to start or stop running, and the working efficiency of the motor 3 and the safety of a process system are improved.

Fig. 2 is a schematic structural diagram of a motor control system according to another embodiment of the present disclosure.

In some embodiments, as shown in fig. 2, the switch module 10 may include a remote local switch 11, a remote closing switch 16, a local closing switch 17, a remote tripping switch 18, and a local tripping switch 19, wherein the remote closing switch 16, the local closing switch 17, the remote tripping switch 18, and the local tripping switch 19 are respectively connected to the remote local switch 11.

The remote local changeover switch 11 is used for changing over the control mode of the motor 3, and the control mode of the motor 3 includes a remote control mode and a local control mode. In the remote control mode, a worker can operate the remote closing switch 16 to control the motor 3 to start operation or operate the remote tripping switch 18 to control the motor 3 to stop operation through a computer, and the worker does not need to arrive at the working site of the motor 3. In the local control mode, a worker can directly operate the local closing switch 17 to control the motor 3 to start operation or operate the local tripping switch 19 to control the motor 3 to stop operation in a motor control cabinet at a work site.

The remote in-situ switch 11 includes a first remote switch 12, a second remote switch 13, a first in-situ switch 14 and a second in-situ switch 15, the remote closing switch 16 being connected in series with the first remote switch 12 to form a first closing branch 111, the in-situ closing switch 17 being connected in series with the first in-situ switch 14 to form a second closing branch 112, the remote trip switch 18 being connected in series with the second remote switch 13 to form a first trip branch 113, and the in-situ trip switch 19 being connected in series with the second in-situ switch 15 to form a second trip branch 114.

When the operator switches the control mode of the motor 3 to the remote control mode by the remote local changeover switch 11, the first remote switch 12 and the second remote switch 13 are simultaneously closed, and the first local switch 14 and the second local switch 15 are kept in the off state. When the worker switches the control mode of the motor 3 to the local control mode through the remote local switching switch 11, the first local switch 14 and the second local switch 15 are simultaneously closed, and the first remote switch 12 and the second remote switch 13 are maintained in the open state.

As another example, at least some of the first remote switch 12, the second remote switch 13, the first local switch 14, and the second local switch 15 in the remote local switch 11 may be eliminated, or at least some of the first remote switch 12, the second remote switch 13, the first local switch 14, and the second local switch 15 may be directly shorted in the circuit, depending on the process control requirements, while the function of switching the control mode of the motor 3 of the remote local switch 11 may be eliminated.

In some embodiments, as shown in fig. 2, the coils of the two-position relay 20 include a closing coil 21 and a tripping coil 22, the two-position relay 20 further includes a first normally open contact 23, a second normally open contact 24, and a first normally closed contact 25, the first closing branch 111 is connected in parallel with the second closing branch 112 and then connected in series with the closing coil 21, and the first tripping branch 113 is connected in parallel with the second tripping branch 114 and then connected in series with the tripping coil 22.

When the remote closing switch 16 is operated to be closed or the local closing switch 17 is operated to be closed, the closing coil 21 of the dual-position relay 20 is electrified, and the dual-position relay 20 is closed; when the remote trip switch 18 is operated to close or the local trip switch 19 is operated to close, the trip coil 22 of the dual position relay 20 is energized and the dual position relay 20 trips.

In one possible embodiment, the remote closing switch 16, the local closing switch 17, the remote tripping switch 18 and the local tripping switch 19 may be four separate switches, and at the same time the operator may operate only one of them to close.

It should be understood by those skilled in the art that the remote closing switch 16, the local closing switch 17, the remote trip switch 18 and the local trip switch 19 may be combined into closing switches and trip switches in other numbers and forms, all falling within the scope of the present disclosure.

The first normally open contact 23 of the two-position relay 20 is disposed on the third trip branch 115 in parallel with the second trip branch 114. The second normally open contact 24 of the two position relay 20 is connected between the live line of the power module 1 and the coil 30 of the contactor. The first normally closed contact 25 of the two-position relay 20 is connected between the live wire and the zero wire of the power module 1, and the branch where the first normally closed contact 25 is located is connected in parallel with the branch where the second normally open contact 24 is located, the coil 30 of the series contactor is located.

The first normally open contact 23 and the second normally open contact 24 of the two-position relay 20 are closed when the closing coil 21 is powered, that is, the two-position relay 20 is closed when closing; open when the trip coil 22 is energized, i.e., open when the two position relay 20 trips. The first normally closed contact 25 is opened when the two-position relay 20 is closed and closed when the two-position relay 20 is tripped.

In some embodiments, as shown in fig. 2, the control module 2 further comprises a time relay for monitoring the voltage of the power module 1 in the motor control system 100, the time relay comprising a third normally open contact 41, a second normally closed contact 42, a fourth normally open contact 43 and a fifth normally open contact 44. The third normally open contact 41 and the fifth normally open contact 44 of the time relay are closed instantaneously when the coil 40 of the time relay is energized and are opened when the coil 40 of the time relay is de-energized. The fourth normally open contact 43 of the time relay is instantaneously closed when the coil 40 of the time relay is energized and instantaneously opened when the coil 40 of the time relay is de-energized. The second normally closed contact 42 of the time relay is opened instantaneously when the coil 40 of the time relay is energized and closed when the coil 40 of the time relay is de-energized.

Wherein the second normally closed contact 42 is disposed on the third tripping branch 115 and connected between the first normally open contact 23 and the tripping coil 22. The third normally open contact 41 is connected in series between the live line of the power module 1 and the second normally open contact 24. The coil 40 of the time relay is connected in series between the first normally closed contact 25 and the zero line of the power supply module 1, and the series branch of the first normally closed contact 25 and the coil 40 of the time relay is connected in parallel with the series branch of the third normally open contact 41, the second normally open contact 24 and the coil 30 of the contactor. The fourth normally open contact 43 is connected in series between the bus ends of the first closing branch 111 and the second closing branch 112 and the closing coil 21. A fifth normally open contact 44 is connected between the live line of the power supply module 1 and the coil 40 of the time relay, and the fifth normally open contact 44 is connected in parallel with the first normally closed contact 25.

When the time relay detects that the voltage of the power supply module 1 is greater than the preset voltage, the coil 40 of the time relay is electrified, the third normally open contact 41, the fourth normally open contact 43 and the fifth normally open contact 44 are instantaneously closed, and the second normally closed contact 42 is instantaneously opened. When the time relay detects that the voltage of the power supply module 1 is smaller than the preset voltage, the coil 40 of the time relay is de-energized, the closed third normally open contact 41 is in delayed opening, the closed fourth normally open contact 43 is in instantaneous opening, the closed fifth normally open contact 44 is in delayed opening, and the closed second normally closed contact 42 is in delayed closing.

The preset voltage is less than the rated working voltage of the motor 3, and the delay time of the time relay can be preset, for example, the preset time can be set to any time of 1-10 s, and both the preset voltage and the delay time can be adaptively adjusted according to the working requirements of the motor 3, and both the preset voltage and the delay time fall within the protection range of the present disclosure.

In the present disclosure, when the power module 1 supplies power to the motor 3 and the control module 2 by using the rated voltage of the motor 3, the coil 40 of the time relay is energized, the third normally open contact 41 and the fourth normally open contact 43 of the time relay are instantaneously closed, and the second normally closed contact 42 is instantaneously opened, at this time, the worker can control the motor 3 to start and operate by operating the remote local transfer switch 11, the remote closing switch 16 and the local closing switch 17. The coil 40 of the time relay is electrified, the fifth normally-open contact 44 is instantaneously closed, the self-holding branch of the time relay is communicated, and the self-holding branch of the time relay can enable the coil 40 of the time relay to be kept in an electrified state when the power module 1 is normally powered.

In one possible embodiment, when the motor 3 is in the remote control mode, if the remote closing switch 16 is operated by a worker to be closed, the first closing branch 111 is turned on, the closing coil 21 of the two-position relay 20 is powered, the first normally-open contact 23 and the second normally-open contact 24 of the two-position relay 20 are closed, and the coil 30 of the contactor is powered, the contactor is closed, and the contactor controls the motor 3 to start operation; the first normally closed contact 25 of the two-position relay 20 is opened and the coil 40 of the time relay is kept charged by its self-holding branch.

In the running process of the motor 3, if a worker operates the remote trip switch 18 to be closed, the first trip branch 113 is conducted, the trip coil 22 of the double-position relay 20 is electrified, the first normally-open contact 23 and the second normally-open contact 24 which are closed by the double-position relay 20 are disconnected, the disconnected first normally-closed contact 25 is closed, the coil 30 of the contactor is electrified, the contactor trips, and the contactor controls the motor 3 to stop running.

In another embodiment, when the motor 3 is in the local control mode, the local closing switch 17 is operated by a worker to be closed, the second closing branch 112 is turned on, the closing coil 21 of the two-position relay 20 is powered, the first normally-open contact 23 and the second normally-open contact 24 of the two-position relay 20 are closed, the first normally-closed contact 25 of the two-position relay 20 is disconnected, the coil 30 of the contactor is powered, the contactor is closed, and the contactor controls the motor 3 to start running.

In the running process of the motor 3, if the local trip switch 19 is operated by a worker to be closed, the second trip branch 114 is conducted, the trip coil 22 of the double-position relay 20 is electrified, the first normally-open contact 23 and the second normally-open contact 24 which are closed by the double-position relay 20 are disconnected, the disconnected first normally-closed contact 25 is closed, the coil 30 of the contactor is electrified, the contactor trips, and the contactor controls the motor 3 to stop running.

In a possible embodiment, during normal operation of the electric motor 3, the power module 1 is subjected to a voltage surge, i.e. the voltage of the power module 1 is lower than a preset voltage at which the electric motor 3 is allowed to operate. When the time relay detects that the voltage of the power supply module 1 is less than the preset voltage, the time relay trips due to the low voltage. If the duration of the coil 40 of the time relay in the trip state due to the low voltage is less than the delay time of the time relay, the fifth normally-open contact 44 of the time relay keeps a closed state within the time of the coil 40 of the time relay in the trip state due to the low voltage, and the branch of the fifth normally-open contact 44 connected in series with the coil 40 of the time relay is in a conducting state; the second normally closed contact 42 of the time relay keeps an off state, and the two-position relay 20 is still in a closing state; the third normally open contact 41 of the time relay is kept closed, and the branch of the contactor in which the coil 30 is located is in a conducting state. Within the time delay of the time relay, if the power module 1 recovers the rated voltage of the motor 3 or switches the standby power supply to supply power to the motor 3 and the control module 2, the branch of the coil 30 of the contactor is in a conducting state, the coil 30 of the contactor is electrified and reclosed, the motor 3 is automatically started by power shaking, the coil 40 of the time relay is electrified through the self-holding loop at the moment, and the working efficiency and the industrial production efficiency of the motor 3 are improved.

If the duration of the coil 40 of the time relay in the trip state is longer than or equal to the delay duration of the time relay, the third normally open contact 41 of the time relay disconnects the branch where the coil 30 of the contactor is located, the contactor trips, and the motor 3 is controlled to stop running; meanwhile, the fourth normally open contact 43 instantaneously disconnects the branch where the closing coil 21 of the two-position relay 20 is located, and the closing operation of the motor 3 is prohibited; at the same time, the closed fifth normally open contact 44 opens the self-holding loop of the coil 40 of the time relay.

At this time, the two-position relay 20 is still in a closing state, and no trip occurs, because the fifth normally-open contact 44 and the first normally-closed contact 25 are in a breaking state, if the voltage of the power supply module 1 is greater than the preset voltage of the motor 3 allowed to operate, the coil 40 of the time relay cannot be electrified, so that before the two-position relay 20 trips, the coil 30 of the contactor cannot be electrified, and the contactor cannot be switched on because the coil 40 of the time relay is electrified.

Meanwhile, the second normally closed contact 42 is closed, and the first normally open contact 23 is still in a closed state, so that the trip coil 22 of the two-position relay 20 is electrified when the voltage of the power module 1 is greater than the preset voltage allowed by the motor 3 to operate, the two-position relay 20 trips, and the motor control system 100 returns to a state before closing.

In some possible embodiments, the motor control system 100 further comprises a protection module 4, the protection module 4 being arranged between the power module 1 and the motor 3 for tripping to protect the motor 3 when the operating state of the motor 3 meets a preset condition. Wherein, protection module 4 can adopt thermal relay or motor integrated protection device, and when the predetermined condition of motor 3's running state includes that overload, default phase, locked rotor, short circuit, excessive pressure, under-voltage, electric leakage, unbalanced three-phase, quick-break overflow and situation such as overheated appear in motor 3's running state, protection module 4 trips, and motor 3 stall prevents that motor 3 from damaging.

In some possible embodiments, the control module 2 further comprises a sixth normally open contact 411 and a third normally closed contact 412, which are associated with the protection module 4, the sixth normally open contact 411 being closed and the third normally closed contact 412 being open when the protection module is tripped.

The sixth normally-open contact 411 is connected in parallel with the second normally-closed contact 42, and the third normally-closed contact 412 is connected in series between the live line of the power module 1 and the third normally-open contact 41.

In the running process of the motor 3, when the running state of the motor 3 meets the preset condition, the protection module 4 trips, the third normally closed contact 412 of the control module 2 is disconnected, the coil 30 of the contactor loses power, the contactor trips, and the motor 3 is controlled to stop running; meanwhile, the sixth normally open contact 411 of the control module 2 is closed, the trip coil 22 of the two-position relay 20 is energized, and the two-position relay 20 trips and returns to the state before closing.

In some possible embodiments, the control module 2 further includes a gang switch 55, the gang switch 55 is connected in series between the third normally closed contact 412 and the third normally open contact 41, the gang switch 55 is a normally closed switch, and the gang switch 55 is used for controlling the stop of the operation of the motor 3. When a fault occurs in the external working system of the motor 3, in order to prevent an accident, a worker can manually operate the joint control switch 55, so that the joint control switch 55 is disconnected, the coil 30 of the contactor is powered off, the contactor trips, the motor 3 is controlled to stop running, the safety of the working environment is improved, the motor 3 is protected, and the service life of the motor 3 is prolonged.

In some possible embodiments, the motor control system 100 further includes a first power switch 51, one end of the first power switch 51 is connected to the live wire of the power module 1, and the other end of the first power switch 51 is connected to the protection module 4 and the control module 2, respectively. The first power switch 51 is a switch of the power module 1, and when the first power switch 51 is turned on, the power module 1 can supply power to the motor 3 and the control module 2.

In the present disclosure, the control module 2 further includes a second power switch 52, one end of the second power switch 52 is connected to the other end of the first power switch 51, and the other end of the second power switch 52 is connected to the first closing branch 111, the second closing branch 112, the first tripping branch 113, the second tripping branch 114, the third tripping branch 115, and the third normally closed contact 412. The second power switch 52 is a switch for controlling the power module 1 to supply power to the control module 2, and when the second power switch 52 is closed, the power module 1 supplies power to the control module 2.

In some possible embodiments, the control module 2 further includes a first indicator light 53 and a second indicator light 54, the contactor further includes a seventh normally open contact 31 and a fourth normally closed contact 32, the seventh normally open contact 31 is connected in series between the second power switch 52 and one end of the first indicator light 53, the fourth normally closed contact 32 is connected in series between the second power switch 52 and one end of the second indicator light 54, and the other end of the first indicator light 53 and the other end of the second indicator light 54 are respectively connected to the zero line of the power module 1.

Illustratively, when a worker operates the remote closing switch 16 or the local closing switch 17, the closing coil 21 of the two-position relay 20 is energized, the two-position relay 20 is closed, the coil 30 of the contactor is energized, the contactor is closed, the seventh normally-open contact 31 of the contactor is closed, the fourth normally-closed contact 32 is opened, the first indicator lamp 53 is turned on, and the second indicator lamp 54 is turned off, wherein the first indicator lamp 53 is used for indicating that the contactor is in a closing state.

When a worker operates the remote trip switch 18 or the local trip switch 19, the trip coil 22 of the dual-position relay 20 is electrified, the dual-position relay 20 is tripped, the coil 30 of the contactor is electrified, the contactor is tripped, the seventh normally-open contact 31 of the contactor is opened, the fourth normally-closed contact 32 is closed, the first indicator lamp 53 is turned off, the second indicator lamp 54 is turned on, and the second indicator lamp 54 is used for indicating that the contactor is in a trip state.

In some possible embodiments, the contactor further includes an eighth normally open contact 33 connected in series between the first power switch 51 and the protection module 4, after the coil 30 of the contactor is powered, the contactor is closed, the eighth normally open contact 33 is closed, the power module 1 connects the protection module 4 and the motor 3, the motor 3 starts to operate, and the protection module 4 protects the operation process of the motor 3.

Fig. 3 is a schematic structural diagram of a monitoring module of a motor control system according to an embodiment of the present disclosure.

In some possible embodiments, as shown in fig. 3, the motor control system 100 further includes a monitoring module 5, the monitoring module 5 is connected to the power module 1, the power module 1 supplies power to the monitoring module 5, and the monitoring module 5 is configured to detect an operating state of the motor control system 100 and output an operating signal of the motor control system 100. The monitoring module 5 comprises a first monitoring loop 511, a second monitoring loop 512, a third monitoring loop 513, a fourth monitoring loop 514 and a fifth monitoring loop 515.

Wherein, the first monitoring circuit 511 is provided with a first monitoring switch 151, when detecting that the first remote switch 12 and the second remote switch 13 are closed, the first monitoring switch 151 is closed, and the monitoring module 5 outputs a signal for representing that the remote operation is allowed.

The ninth normally open contact 34 of the contactor is arranged on the second monitoring loop 512, when the contactor is switched on, the ninth normally open contact 34 of the contactor is closed, the monitoring module 5 outputs a signal for representing that the contactor is switched on and the motor 3 is allowed to start running.

The third monitoring circuit 513 is provided with a fifth normally closed contact 35 of the contactor, when the contactor trips, the fifth normally closed contact 35 of the contactor is opened, and the monitoring module 5 outputs a signal for indicating that the contactor trips and the motor 3 stops running.

The fourth monitoring circuit 514 is provided with a tenth normally open contact 26 and a sixth normally closed contact 27 of the two-position relay 20, and is further provided with an eleventh normally open contact 36 and a seventh normally closed contact 37 of the contactor, wherein the sixth normally closed contact 27 and the eleventh normally open contact 36 are connected in series, the tenth normally open contact 26 and the seventh normally closed contact 37 are connected in series, and a series branch of the sixth normally closed contact 27 and the eleventh normally open contact 36 is connected in parallel with a series branch of the tenth normally open contact 26 and the seventh normally closed contact 37. The fourth monitoring circuit 514 is configured to output an operating condition signal indicating that the two position relay 20 is not in compliance with the contactor operating condition. When the double-position relay 20 is detected to be in a trip state and the contactor is detected to be in a closing state, the sixth normally closed contact 27 is closed, the eleventh normally open contact 36 is closed, and the monitoring module 5 outputs a signal for representing that the double-position relay 20 is in the trip state and the contactor is in the closing state. When the double-position relay 20 is detected to be in a closing state and the contactor is detected to be in a tripping state, the seventh normally closed contact 37 is closed, the tenth normally open contact 26 is closed, and the monitoring module 5 outputs a signal for representing that the double-position relay 20 is in the closing state and the contactor is in the tripping state.

The fifth monitoring loop 515 is provided with a second monitoring switch 152, a third monitoring switch 153 and a protection module 4, wherein the second monitoring switch 152, the third monitoring switch 153 and the protection module 4 are connected in parallel, when the first power switch 51 is detected to be disconnected due to a fault, the second monitoring switch 152 is closed, the monitoring module 5 outputs a signal for representing the fault of the first power switch 51, when the second power switch 52 is detected to be disconnected due to a fault, the third monitoring switch 153 is closed, the monitoring module 5 outputs a signal for representing the fault of the second power switch 52, when the motor 3 is detected to be in fault, the protection module 4 trips, and the monitoring module 5 outputs a signal for representing the fault of the motor 3.

Through the setting of monitoring module 5, the staff can have a detailed understanding to the operating condition of motor control system 100, when motor control system 100 breaks down, can confirm the fault reason and the trouble emergence point as soon as possible, improves work efficiency, and then improves the operating efficiency.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (11)

1. A motor control system (100), characterized in that the motor control system (100) comprises a power module (1), a control module (2) and a motor (3), the power module (1) is used for supplying power to the control module (2) and the motor (3), and the control module (2) is used for controlling the motor (3) to start or stop running; wherein the control module (2) comprises:

the switch module (10), the switch module (10) is connected with the live wire of the power supply module (1) and is used for providing a switch signal;

a coil of the double-position relay (20) is connected in series between the switch module (10) and a zero line of the power module (1), and the double-position relay (20) is switched on or tripped under the control of a switch signal of the switch module (10);

the contactor, the coil (30) of contactor is connected between the live wire and the zero line of power module (1), and with two position relay (20) with the series branch of switch module (10) is parallelly connected, the contactor is used for controlling motor (3) start-up operation or stop operation.

2. The motor control system (100) of claim 1, wherein the switch module (10) comprises a remote local switch (11), a remote closing switch (16), a local closing switch (17), a remote trip switch (18), and a local trip switch (19), the remote closing switch (16), the local closing switch (17), the remote trip switch (18), and the local trip switch (19) being connected to the remote local switch (11), respectively;

distant place change over switch in situ (11) include first distant place switch (12), second distant place switch (13), first switch in situ (14) and second switch in situ (15), distant place closing switch (16) with first distant place switch (12) are established ties in order to form first closing branch (111), closing switch in situ (17) with first switch in situ (14) are established ties in order to form second closing branch (112), distant place trip switch (18) with second distant place switch (13) are established ties in order to form first trip branch (113), trip switch in situ (19) with second switch in situ (15) are established ties in order to form second trip branch (114).

3. The motor control system (100) according to claim 2, wherein the coils of the two-position relay (20) comprise a closing coil (21) and a tripping coil (22), the two-position relay (20) further comprises a first normally open contact (23), a second normally open contact (24) and a first normally closed contact (25), the first closing branch (111) is connected in parallel with the second closing branch (112) and then connected in series with the closing coil (21), and the first tripping branch (113) is connected in parallel with the second tripping branch (114) and then connected in series with the tripping coil (22);

the first normally open contact (23) is arranged on a third tripping branch (115) which is connected with the second tripping branch (114) in parallel;

the second normally open contact (24) is connected between the live wire of the power supply module (1) and the coil (30) of the contactor;

the first normally closed contact (25) is connected between a live wire and a zero wire of the power module (1), and a branch where the first normally closed contact (25) is located is connected with a branch where the second normally open contact (24) is connected in series with a coil (30) of the contactor in parallel.

4. The motor control system (100) of claim 3, wherein the control module (2) further comprises a time relay comprising a third normally open contact (41), a second normally closed contact (42), a fourth normally open contact (43), and a fifth normally open contact (44), wherein,

the second normally closed contact (42) is arranged on the third tripping branch (115) and is connected between the first normally open contact (23) and the tripping coil (22);

the third normally open contact (41) is connected in series between the live wire of the power supply module (1) and the second normally open contact (24); a coil (40) of the time relay is connected in series between the first normally closed contact (25) and a zero line of the power supply module (1), and a series branch of the first normally closed contact (25) and the coil (40) of the time relay is connected in parallel with a series branch of the third normally open contact (41), the second normally open contact (24) and the coil (30) of the contactor;

the fourth normally open contact (43) is connected in series between the confluence ends of the first closing branch (111) and the second closing branch (112) and the closing coil (21);

the fifth normally open contact (44) is connected between the live line of the power supply module (1) and the coil (40) of the time relay, and the fifth normally open contact (44) is connected in parallel with the first normally closed contact (25).

5. The motor control system (100) according to claim 4, characterized in that the motor control system (100) further comprises a protection module (4), the protection module (4) being arranged between the power module (1) and the motor (3) for tripping to protect the motor (3) when the operating state of the motor (3) meets a preset condition.

6. The motor control system (100) of claim 5, characterized in that the control module (2) further comprises a sixth normally open contact (411) and a third normally closed contact (412) linked to the protection module (4), the sixth normally open contact (411) being closed and the third normally closed contact (412) being open when the protection module (4) trips;

the sixth normally-open contact (411) is connected with the second normally-closed contact (42) in parallel, and the third normally-closed contact (412) is connected between the live wire of the power supply module (1) and the third normally-open contact (41) in series.

7. The motor control system (100) according to claim 6, wherein the control module (2) further comprises a gang control switch (55), the gang control switch (55) is connected in series between the third normally closed contact (412) and the third normally open contact (41), the gang control switch (55) is a normally closed switch, and the gang control switch (55) is used for controlling the motor (3) to stop running.

8. The motor control system (100) according to claim 7, wherein the motor control system (100) further comprises a first power switch (51), one end of the first power switch (51) is connected to the live wire of the power module (1), and the other end of the first power switch (51) is connected to the protection module (4) and the control module (2), respectively.

9. The motor control system (100) according to claim 8, wherein the control module (2) further comprises a second power switch (52), one end of the second power switch (52) is connected to the other end of the first power switch (51), and the other end of the second power switch (52) is connected to the first closing branch (111), the second closing branch (112), the first tripping branch (113), the second tripping branch (114), the third tripping branch (115), and the third normally closed contact (412).

10. The motor control system (100) of claim 9, characterized in that the control module (2) further comprises a first indicator light (53) and a second indicator light (54);

the contactor further comprises a seventh normally-open contact (31) and a fourth normally-closed contact (32), the seventh normally-open contact (31) is connected in series between the second power switch (52) and one end of the first indicator light (53), the fourth normally-closed contact (32) is connected in series between the second power switch (52) and one end of the second indicator light (54), and the other end of the first indicator light (53) and the other end of the second indicator light (54) are respectively connected with a zero line of the power module (1).

11. The motor control system (100) of claim 10, wherein the contactor further comprises an eighth normally open contact (33), the eighth normally open contact (33) being connected in series between the first power switch (51) and the protection module (4).

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