Control circuit based on motor protector
By introducing multiple circuit breakers and contactors into the motor protector, combined with control and switching modules, the problem of existing motor protectors being unable to protect the motor during abnormal operation is solved, achieving precise protection and safe operation of the motor.
Patent Information
- Application Number
- CN202520636493.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-04-07
AI Technical Summary
Existing motor protectors cannot effectively protect the motor under abnormal operating conditions, resulting in the motor burning out.
Multiple circuit breakers and contactors are connected to the protector, and combined with the control module, switching module and display, precise control and modular connection are achieved to enhance motor protection function.
It achieves precise protection for the motor, reduces assembly difficulty, and improves the safety and reliability of motor operation.
Smart Images
Figure CN223912236U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a motor protector, specifically a control circuit based on motor protector. BACKGROUND
[0002] The motor protector is generally applicable to low-voltage motor application sites, realizes various starting control schemes of the motor, ensures safe operation of the motor, and is the best choice of intelligent MCC or production DCS system terminal unit. The protector can be widely used in metallurgy, papermaking, coal, power generation, petroleum, petrochemical, chemical industry, rail transit and various occasions.
[0003] The current motor protector is usually a thermal relay matched with a contactor. This protector has simple structure and low price, but this protection method can only achieve the predetermined technical requirements under specific conditions, and such specific conditions do not exist objectively. At present, since there is no accurate and effective protection measure for the motor, a large number of motors are burned out under abnormal operation conditions. UTILITY MODEL CONTENTS
[0004] In order to solve the above technical problems, the utility model provides a control circuit based on motor protector.
[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:
[0006] A control circuit based on motor protector, comprising an input power supply, a protector, a mutual inductor, a control module, a switching module, a circuit breaker QF, an air switch QF2 and a contactor KM, the protector is provided with a relay K1, a relay K2, a relay K3 and a relay K4, wherein the relay K1 is normally closed, the relay K2, the relay K3 and the relay K4 are normally open, the input power supply is connected with one end of the main contact of the circuit breaker QF, the other end of the main contact of the circuit breaker QF is connected with one end of the main contact of the contactor KM, the other end of the main contact of the contactor KM is connected with the motor through the line from the mutual inductor, the input power supply is connected with the control module through the air switch QF2, the control module is connected with the relay K1, the relay K2 and the relay K3 in the protector, the switching module is connected with the protector, the switch is used for switching remote and local control, the protector is provided with a display, the protector is connected with the coil of the circuit breaker QF and the coil of the contactor KM, and the coil of the circuit breaker QF and the coil of the contactor KM are connected with the power supply, the relay K3 is connected with the coil of the circuit breaker QF, and the relay K1 is connected with the coil of the contactor KM.
[0007] Further, the mutual inductor is connected with the protector, and the other end of the main contact of the circuit breaker QF is connected with the protector through the air switch QF1.
[0008] As further, the control module comprises a normally closed emergency stop button JSS, one end of the emergency stop button JSS is connected with the air switch QF2, the other end of the emergency stop button JSS is connected with the relay K2, the relay K3 in the protector is connected with the air switch QF2 through the auxiliary normally open contact of the circuit breaker QF.
[0009] As further, the protector is connected with a communication module.
[0010] As further, the switching module comprises a change-over switch SA, the change-over switch SA has a first end and a second end, the first end is connected with the DCS control system, the second end is connected with the switch SS and the switch SF, the switch SS and the switch SF are in parallel, the DCS control system, the switch SS and the switch SF are all connected with the protector, the change-over switch SA is also connected with the protector through the auxiliary normally closed contact of the contactor KM and the auxiliary normally closed contact of the circuit breaker QF.
[0011] As further, the input power source is connected with a leakage switch, the leakage switch is connected with the air QF2.
[0012] Compared with the prior art, the utility model has following beneficial technical effects:
[0013] A plurality of circuit breakers and contactors are adopted, which are connected with the protector to control, realize accurate control, effectively protect the motor, realize modular connection and reduce assembly difficulty. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a connection principle schematic view of the utility model. DETAILED DESCRIPTION
[0015] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.
[0016] In the description of the utility model, it is necessary to understand that if there are terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are indicated in the orientation or positional relationship based on the orientation or positional relationship shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the device or element indicated must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.
[0017] In the description of the utility model, it should be pointed out that, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected. It can be mechanically connected, or electrically connected. It can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0018] As Figure 1As shown, a control circuit based on a motor protector includes an input power supply, a protector, a transformer, a control module, a switching module, a circuit breaker QF, an air switch QF2 and a contactor KM, the circuit breaker QF, the air switch QF2 and the contactor KM each have a main contact, a plurality of auxiliary normally open contacts and an auxiliary normally closed contact, the protector is provided with a relay K1, a relay K2, a relay K3 and a relay K4, wherein the relay K1 is normally closed, the relay K2, the relay K3 and the relay K4 are normally open, the input power supply is connected to one end of the main contact of the circuit breaker QF, the other end of the main contact of the circuit breaker QF is connected to one end of the main contact of the contactor KM, the other end of the main contact of the contactor KM is connected to the motor through the line from the transformer, the input power supply is connected to the control module through the air switch QF2, the control module is connected to the relay K1, the relay K2 and the relay K3 in the protector, the switching module is connected to the protector, the switching module is used for switching between remote control and local control, the protector is provided with a display, the protector is connected to the coil of the circuit breaker QF and the coil of the contactor KM, and the coil of the circuit breaker QF and the coil of the contactor KM are connected to the power supply, the relay K3 is connected to the coil of the circuit breaker QF, and the relay K1 is connected to the coil of the contactor KM. The display can be used to display various states, such as the wiring state, whether there is a fault, the fault type and the like. The input power supply is 380V or 220V, or other voltage values. The protector can select a YD2310S model product, or other models, to realize a direct starting mode, and use the protector to play a tripping role.
[0019] The transformer is connected to the protector, and the other end of the main contact of the circuit breaker QF is connected to the protector through the air switch QF1. The transformer can select a CT20P series.
[0020] The control module includes a normally closed emergency stop button JSS, one end of the emergency stop button JSS is connected to the air switch QF2, the other end of the emergency stop button JSS is connected to the relay K2, and the relay K3 in the protector is connected to the air switch QF2 through the auxiliary normally open contact of the circuit breaker QF. When a fault occurs, the normally open contact of the contactor KM connected to the emergency stop button JSS is converted to closed, and then the relay K2 in the protector is converted from open to closed, to realize emergency stop.
[0021] The protector can also be provided with a communication module, which can be connected to a mobile phone or other remote terminal.
[0022] The input power supply is connected to a leakage switch FU, which is connected to the air switch QF2, to play a protection role.
[0023] The switching module comprises a change-over switch SA, the change-over switch SA has a first end and a second end, the first end is connected with the DCS control system, the second end is connected with the switch SS and the switch SF, the switch SS and the switch SF are in parallel, the DCS control system, the switch SS and the switch SF are connected with the protector, the change-over switch SA is further connected with the protector through the auxiliary normally closed contact of the contactor KM and the auxiliary normally closed contact of the circuit breaker QF.
[0024] Control of each relay in the protector: there are 4 relay outputs in total, K1 is parking, K2 is starting, K3 is starting and parallelly driving the molded case circuit breaker, and K4 is fault output.
[0025] The K3 programmable output can be in pulse mode (0.2-100.0s) and level mode, if the relay K3 is programmable alarm output, the action mode must be level mode.
[0026] It should be noted that the above is only the preferred embodiment of the present application, and is not intended to limit the present application, although the present application is described in detail with reference to the embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, but any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims
1. A control circuit based on a motor protector, characterized by, The input power source, the protector, the mutual inductor, the control module, the switching module, the circuit breaker QF, the air switch QF2 and the contactor KM are included, the relay K1, the relay K2, the relay K3 and the relay K4 are arranged in the protector, the relay K1 is normally closed, the relay K2, the relay K3 and the relay K4 are normally open, the input power source is connected with one end of the main contact of the circuit breaker QF, the other end of the main contact of the circuit breaker QF is connected with one end of the main contact of the contactor KM, the other end of the main contact of the contactor KM is connected with the motor through the line from the mutual inductor, the input power source is connected with the control module through the air switch QF2, the control module is connected with the relay K1, the relay K2 and the relay K3 in the protector, the switching module is connected with the protector, the switch is used for switching the remote and local control, the display is connected on the protector, the protector is connected with the circuit breaker QF coil and the contactor KM coil, and the circuit breaker QF coil and the contactor KM coil are connected with the power source, the relay K3 is connected with the circuit breaker QF coil, and the relay K1 is connected with the contactor KM coil.
2. The control circuit based on a motor protector according to claim 1, characterized in that, The mutual inductor is connected with the protector, and the other end of the main contact of the circuit breaker QF is connected with the protector through the air switch QF1.
3. The control circuit based on a motor protector according to claim 2, characterized in that, The control module includes the normally closed emergency stop button JSS, one end of the emergency stop button JSS is connected with the air switch QF2, the other end of the emergency stop button JSS is connected with the relay K2, and the relay K3 in the protector is connected with the air switch QF2 through the auxiliary normally open contact of the circuit breaker QF.
4. The control circuit based on a motor protector according to claim 3, characterized in that, The protector is connected with the communication module.
5. The control circuit based motor protector of claim 4, wherein, The switching module includes the change-over switch SA, the change-over switch SA has a first end and a second end, the first end is connected with the DCS control system, the second end is connected with the switch SS and the switch SF, the switch SS and the switch SF are connected in parallel, the DCS control system, the switch SS and the switch SF are connected with the protector, and the change-over switch SA is further connected with the protector through the auxiliary normally closed contact of the contactor KM and the auxiliary normally closed contact of the circuit breaker QF.
6. The motor protector based control circuit of claim 4, wherein, The input power source is connected with the leakage switch, and the leakage switch is connected with the air QF2.