Three-phase asynchronous motor phase sequence identification circuit

Abstract

The utility model discloses three phase asynchronous motor phase sequence identification circuit belongs to three phase asynchronous motor technical field, including three phase motor total power supply circuit, phase sequence relay and M motor, three phase motor total power supply circuit includes three -phase circuit, main power circuit breaker, current relay and contactor, phase sequence relay and M motor all are through three -phase wire with three phase motor total power supply circuit electricity connection, this three phase asynchronous motor phase sequence identification circuit, through the phase sequence relay of setting judgment phase sequence order's function, utilize the indicator light indication state, and output corresponding contact action, cooperate corresponding circuit, start or cut off loop power supply, reach the function of starting main power supply or disconnecting main circuit, improved three phase asynchronous motor's use stability, and then improved the protection effect of equipment.

Description

Technical Field

[0001] This utility model relates to the field of three-phase asynchronous motor technology, and more specifically, to a phase sequence identification circuit for three-phase asynchronous motors. Background Technology

[0002] Three-phase asynchronous motors are among the most widely used drive devices in the industrial field. Their working principle is based on the law of electromagnetic induction, and they have advantages such as simple structure, reliable operation, and low cost.

[0003] Currently, industrial power grids provide three-phase power with a phase sequence of 120 degrees. In the use of three-phase asynchronous motors, motor reversal often occurs due to power phase sequence issues. If it is an oil pump motor, it will cause the oil pump to reverse and fail to provide normal pressure. If it is a lifting motor for beam movement, pressing the down button will cause the machine to rise, and pressing the up button will cause the machine to fall, resulting in failure to achieve the expected effect, reduced customer experience, and even damage to the equipment. To address these issues, we designed a three-phase asynchronous motor phase sequence identification circuit. Utility Model Content

[0004] To address the problems existing in the prior art, the purpose of this utility model is to provide a phase sequence identification circuit for a three-phase asynchronous motor. This circuit determines the phase sequence through a phase sequence relay, indicates the status using indicator lights, and outputs corresponding contact actions. In conjunction with the corresponding circuit, it starts or cuts off the circuit power supply, thereby achieving the function of starting the main power supply or disconnecting the main circuit. This improves the operational stability of the three-phase asynchronous motor and enhances the protection effect of the equipment.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] The three-phase asynchronous motor phase sequence identification circuit includes a three-phase motor main power supply circuit, a phase sequence relay, and a motor M. The three-phase motor main power supply circuit includes a three-phase circuit, a main power circuit breaker, a current relay, and a contactor. The phase sequence relay and the motor M are electrically connected to the three-phase motor main power supply circuit through three-phase wires. This three-phase asynchronous motor phase sequence identification circuit determines the phase sequence through the phase sequence relay, indicates the status using indicator lights, and outputs corresponding contact actions. In conjunction with the corresponding circuit, it starts or cuts off the circuit power supply, thereby achieving the function of starting the main power supply or disconnecting the main circuit. This improves the operational stability of the three-phase asynchronous motor and thus enhances the protection effect of the equipment.

[0007] Furthermore, the phase sequence relay is equipped with a status indicator light, a power input section, a phase sequence detection circuit, a comparison and judgment section, and an output execution section. The phase sequence relay can add phase sequence to the three-phase power supply and identify the phase sequence angle on the three conductors UVW.

[0008] Furthermore, the M motor is electrically connected to two AC contactors that control the forward and reverse rotation of the motor. The M motor is equipped with a thermal relay. The AC contactors are used to control the forward and reverse rotation of the M motor, and the thermal relay is used to protect the M motor.

[0009] Furthermore, the M motor is equipped with a start-stop circuit, which is electrically connected to a switching power supply. The start-stop circuit controls the connection or disconnection of the switching power supply circuit.

[0010] Furthermore, the power input section includes three terminals, which are electrically connected to the A, B, and C phase conductors of the three-phase power supply, respectively.

[0011] Furthermore, the output execution section includes a signal output module and an execution module, which can output switch signals for linkage or control with other devices.

[0012] Furthermore, the current relay and the contactor are electrically connected via a control circuit to control the power supply on and off.

[0013] Compared with existing technologies, the advantages of this utility model are: (1) This solution uses the phase sequence relay to determine the phase sequence, uses indicator lights to indicate the status, and outputs corresponding contact actions. In conjunction with the corresponding circuit, it starts or cuts off the circuit power supply, thereby achieving the function of starting the main power supply or disconnecting the main circuit. This improves the stability of the three-phase asynchronous motor and thus improves the protection effect of the equipment. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the M1 motor circuit of this utility model.

[0015] Explanation of the labels in the diagram: 1. Three-phase motor main power supply circuit; 2. Phase sequence relay; 3. M1 motor; 31. Switching power supply; 32. Start-stop circuit. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0017] Please see Figure 1-2The three-phase asynchronous motor phase sequence identification circuit includes a three-phase motor main power supply circuit 1, a phase sequence relay 2, and an M1 motor 3. The three-phase motor main power supply circuit 1 includes a live wire and a neutral wire. The three-phase motor main power supply circuit 1 includes a three-phase circuit, a main power circuit breaker, a current relay, and a contactor. The phase sequence relay 2 is equipped with a status indicator light, a power input section, a phase sequence detection circuit, a comparison and judgment section, and an output execution section. The status indicator light includes red and green, with green indicating a correct phase sequence and red indicating an incorrect phase sequence, making it convenient for users to observe and judge. The phase sequence detection circuit includes multiple electronic components, such as resistors, capacitors, and inductors, used to sample and process parameters such as voltage and current of the three-phase power supply. The comparison and judgment section can determine whether the detected phase sequence is consistent with the preset phase sequence through a comparator circuit or a microprocessor. The phase sequence relay 2 can add phase sequence to the three-phase power supply and identify the phase sequence angle on the three conductors UVW. The phase sequence relay 2 and the M1 motor 3 are both electrically connected to the three-phase motor main power supply circuit 1 through three-phase conductors.

[0018] Motor M1 3 is electrically connected to two AC contactors that control the forward and reverse rotation of the motor. Motor M1 3 is equipped with a thermal relay. The AC contactors are used to control the forward and reverse rotation of Motor M1 3, and the thermal relay is used to protect Motor M1 3. Motor M1 3 is equipped with a start-stop circuit 32, which is electrically connected to a switching power supply 31. The start-stop circuit 32 controls the connection or disconnection of the switching power supply 31. The power input section includes three terminals, which are electrically connected to the A, B, and C phase wires of the three-phase power supply, respectively.

[0019] The current relay and the contactor are electrically connected through a control circuit to control the power supply. The output execution part includes a signal output module and an execution module, which can output switch signals for linkage or control with other devices. The execution module contains the execution mechanism, such as relay contacts, solenoid valves, etc. When the phase sequence is incorrect, it can directly cut off the circuit or activate other protection measures.

[0020] During operation, this three-phase asynchronous motor phase sequence identification circuit, after the main power switch of the equipment is turned off, adds phase sequence and identifies the phase sequence angles on the three conductors UVW. If UVW differs by 120 degrees, a green light illuminates and the normally open contact of the output is closed; otherwise, a red light illuminates and the normally open contact of the output remains open. The phase sequence relay 2 determines the phase sequence order, uses indicator lights to indicate the status, and outputs corresponding contact actions. In conjunction with the corresponding circuit, it starts or cuts off the circuit power supply, achieving the function of starting the main power supply or disconnecting the main circuit. This improves the operational stability of the three-phase asynchronous motor and thus enhances the protection effect of the equipment.

[0021] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A phase sequence identification circuit for a three-phase asynchronous motor, comprising a three-phase motor main power supply circuit (1), a phase sequence relay (2), and an M1 motor (3), characterized in that: The three-phase motor main power supply circuit (1) includes a three-phase circuit, a main power circuit breaker, a current relay and a contactor. The phase sequence relay (2) and the M1 motor (3) are both electrically connected to the three-phase motor main power supply circuit (1) through three-phase wires.

2. The phase sequence identification circuit for a three-phase asynchronous motor according to claim 1, characterized in that: The phase sequence relay (2) is equipped with a status indicator light, a power input section, a phase sequence detection circuit, a comparison and judgment section, and an output execution section.

3. The phase sequence identification circuit for a three-phase asynchronous motor according to claim 1, characterized in that: The M1 motor (3) is electrically connected to two AC contactors that control the forward and reverse rotation of the motor, and the M1 motor (3) is equipped with a thermal relay.

4. The phase sequence identification circuit for a three-phase asynchronous motor according to claim 1, characterized in that: The M1 motor (3) is equipped with a start-stop circuit (32), which is electrically connected to a switching power supply (31).

5. The phase sequence identification circuit for a three-phase asynchronous motor according to claim 2, characterized in that: The power input section includes three terminals, which are electrically connected to the A, B, and C phase conductors of the three-phase power supply, respectively.

6. The phase sequence identification circuit for a three-phase asynchronous motor according to claim 2, characterized in that: The output execution section includes a signal output module and an execution module.

7. The phase sequence identification circuit for a three-phase asynchronous motor according to claim 1, characterized in that: The current relay and the contactor are electrically connected via a control circuit.

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