CN204103816U - Electric motor load change automatic control power saving device - Google Patents

Abstract

An automatic control power-saving device for motor load change can realize automatic control power-saving when the motor load changes continuously. The three-phase power control module is arranged between a secondary end of a power supply switch and a motor load, a three-phase power control module group is connected and connected in series in a motor load power supply loop, a primary loop input wiring terminal, a thermal protection relay and the three-phase power control module group are sequentially and electrically connected with an output wiring terminal through an electronic overcurrent protector to form a control power-saving loop, and a bypass loop three-phase alternating current contactor is added, so that one end of the three-phase alternating current contactor is electrically connected with the thermal protection relay, and the other end of the three-phase alternating current. The power supply circuit supplies power to the motor load through the three-phase power control module group, and simultaneously supplies power to the motor load through the bypass circuit.

Description

Electric motor load change automatic control power saving device

Technical field

The utility model relates to a control device for realizing power saving for the continuous change of motor load, in particular, it can automatically control the power saving device without changing the output frequency and ensuring that the motor load change will not affect the output power and speed of the motor.

Background technique

At present, the known motor control device is composed of an air circuit breaker, an AC contactor, a thermal relay, and a push button switch to control or start the power supply of the motor. However, many types of motors generate a large amount of waste of active energy during operation, and the motor control device can only start and supply power to the motor load. Generally, the motor control device cannot save electricity for the motor, which causes a large loss of active power energy.

Contents of the invention

In order to overcome the deficiency that the existing motor control device cannot save power for the motor load, the utility model provides a power saving device for automatic control of motor load changes. The motor load power saving control device is connected in series in the loop between the power supply switch and the motor load , not only can provide power to the motor, but also can save the consumption of active power for the motor.

The technical solution adopted by the utility model to solve the technical problem is: in the control circuit, the primary circuit input terminal, thermal protection relay, three-phase power control module group are electrically connected to the output terminal through the electronic overcurrent protector in sequence, A power-saving circuit is formed, and a bypass circuit three-phase AC contactor is set, so that one end of the three-phase AC contactor is electrically connected to the thermal protection relay, and the other end is electrically connected to the output terminal. When working in the power-saving state, the current passes through the input terminals, passes through the thermal protection relay to the three-phase power control module group, the output current is modulated by the three-phase power control module group, and supplies power to the motor through the electronic over-current protector to the output terminal. , to control the output current, voltage, power factor and power smoothly. When working in the bypass circuit, the current passes through the input terminal, passes through the thermal protection relay to the input terminal of the three-phase AC contactor, and then supplies power to the motor from the output terminal of the three-phase AC contactor to the terminal. Once the power-saving circuit fails, the bypass circuit can supply power to the motor. There is no flash switching and no surge current during the process of power-saving transfer to bypass and bypass to power-saving. The secondary control loop is used to control the opening and closing of the three-phase AC contactor in the primary loop and the work of the three-phase power control module group. After the power supply is connected, the motor starts to work through a bypass delay, which is used to reduce the current impact on the three-phase power control module group caused by the excessive current at the moment of motor startup. , it enters a stable state after the overcurrent passes, the working current of the motor returns to normal, and then automatically switches back to power-saving work again, and the power-saving state and bypass state can also be manually operated.

The beneficial effect of the utility model is that, without changing the output frequency, it is ensured that the output power and rotating speed of the motor are not affected to achieve the purpose of saving electricity.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Accompanying drawing: is the circuit schematic diagram of the present utility model

In the figure, RJ. Thermal protection relay, KM. Three-phase AC contactor, MKZ. Three-phase power control module group, HG. Current transformer, GLJ. Electronic overcurrent protector, BKN1. Two-phase air circuit breaker, BKN2. Section Power state protection switch, BKN3. Emergency switch, J1, J2. Intermediate relay, SJ. Delay relay, R. Resistor, XD1. Power-saving signal lamp, XD2. Bypass signal lamp, XD3. Fault signal lamp, BL. Bypass switch, JD. Power-saving switch, PC. Connected to the terminal board, A, B, C, N. Input terminals, a, b, c. Output terminals.

Detailed ways

In the figure, for the primary control circuit, the input terminal A is electrically connected to the thermal protection relay RJ(1), the input terminal B, the two-phase air circuit breaker BKN1(2) are connected to the thermal protection relay RJ(2) Electrical connection, the terminal C of the input terminal is electrically connected to the terminal RJ(3) of the thermal protection relay, the terminal RJ(4) of the thermal protection relay, the terminal MKZ(1) of the three-phase power control module group is connected to the terminal KM(1) of the three-phase AC contactor Terminal electrical connection, thermal protection relay RJ (5) terminal, three-phase power control module group MKZ (2) terminal and three-phase AC contactor KM (2) terminal electrical connection, thermal protection relay RJ (6) terminal, three-phase power The control module group MKZ (3) terminal is electrically connected to the three-phase AC contactor KM (3) terminal, and the three-phase power control module group MKZ (4) terminal is connected to the three-phase AC contactor through the electronic overcurrent protector GLJ (A1) port Terminal KM (4) and output terminal a are electrically connected, terminal MKZ (5) of the three-phase power control module group is connected to terminal KM (5) and output of the three-phase AC contactor through the port of electronic overcurrent protector GLJ (B1) The terminal b is electrically connected, the three-phase power control module group MKZ (6) is electrically connected to the current transformer HG (1), and the current transformer HG (2) is connected to the three-phase power through the electronic overcurrent protector GLJ (C1) The KM(6) terminal of the phase AC contactor is electrically connected with the output terminal c terminal, the three-phase power control module group MKZ(7) terminal is electrically connected with the current transformer HG(4) terminal, and the three-phase power control module group MKZ(8) ) end is electrically connected with the current transformer HG (3) end to form an output circuit for automatic control of motor load changes for power saving and bypass loop power supply.

Secondary control circuit, two-phase air circuit breaker BKN1 (4), thermal protection relay RJ (97), bypass switch BL (23), intermediate relay J1 (6), power-saving switch JD (11) , Three-phase AC contactor KM (13) end, three-phase AC contactor KM (21) end, delay relay SJ (9) end and intermediate relay J1 (5) end are electrically connected, thermal protection relay RJ (98) end It is electrically connected with the fault signal lamp XD3 (X1), the bypass switch BL (24), the intermediate relay J1 (2) is electrically connected with the three-phase AC contactor KM (A1), the intermediate relay J1 (4), the node Terminal BKN2(2) of the power state protection switch is electrically connected to terminal J2(7) of the intermediate relay, terminal JD(12) of the energy-saving switch is electrically connected to terminal J2(6) of the intermediate relay, terminal J2(4) of the intermediate relay is electrically connected to the terminal of the power-saving state The protection switch BKN2 (1) terminal is electrically connected, the three-phase AC contactor KM (14) terminal is electrically connected to the bypass signal lamp XD2 (X1) terminal, the three-phase AC contactor KM (22) terminal is electrically connected to the power-saving signal lamp XD1 (X1) Terminal electrical connection, delay relay SJ (5) end, intermediate relay J1 (3) end, terminal board PC (1) end, resistor R end is electrically connected to intermediate relay J1 (7) end, intermediate relay J1 (8) terminal, terminal board PC(3), the other end of resistor R, emergency switch BKN3(1) and electronic overcurrent protector GLJ(K1), and intermediate relay J1(1) and delay relay SJ( 13) Terminal electrical connection, the delay relay SJ (14) terminal is electrically connected to the intermediate relay J2 (5) terminal, the input terminal N is electrically connected to the two-phase air circuit breaker BKN1 (1) terminal, and the two-phase air circuit breaker BKN1 ( 3) terminal, fault signal lamp XD3 (X2) terminal, three-phase AC contactor KM (A2) terminal, intermediate relay J2 (8) terminal, bypass signal lamp XD2 (X2) terminal, power-saving signal lamp XD1 (X2) terminal, electronic The overcurrent protector GLJ (K2) terminal, the emergency switch BKN3 (2) terminal are electrically connected to the intermediate relay J2 (1) terminal to form a control circuit for time delay, overcurrent protection, and automatic conversion and power saving.

Claims (3)

1. A power-saving device for automatic control of motor load changes. In the control circuit, the input terminal, thermal protection relay, three-phase power control module group and output terminal are sequentially electrically connected. It is characterized in that: input terminal, thermal protection The relay, the three-phase power control module group, are electrically connected to the output terminals sequentially through the electronic overcurrent protector, and a bypass circuit three-phase AC contactor is set, so that one end of the three-phase AC contactor is electrically connected to the thermal protection relay, and the other end It is electrically connected with the output terminal. the 2. The electric motor load change automatic control power-saving device according to claim 1, characterized in that: the input terminal A terminal is electrically connected to the thermal protection relay RJ (1) terminal, the input terminal B terminal, the two-phase air circuit breaker Terminal BKN1(2) is electrically connected to terminal RJ(2) of thermal protection relay, terminal C of input terminal is electrically connected to terminal RJ(3) of thermal protection relay, terminal RJ(4) of thermal protection relay, three-phase power control module group MKZ Terminal (1) is electrically connected to terminal KM(1) of three-phase AC contactor, terminal RJ(5) of thermal protection relay, terminal MKZ(2) of three-phase power control module group is electrically connected to terminal KM(2) of three-phase AC contactor connection, the thermal protection relay RJ (6) end, the three-phase power control module group MKZ (3) end are electrically connected to the three-phase AC contactor KM (3) end, and the three-phase power control module group MKZ (4) end is connected through an electronic pass The GLJ(A1) port of the current protector is electrically connected with the KM(4) terminal of the three-phase AC contactor and the output terminal a terminal, and the MKZ(5) terminal of the three-phase power control module group passes through the GLJ(B1) port of the electronic overcurrent protector It is electrically connected with the terminal KM(5) of the three-phase AC contactor and the terminal b of the output terminal, the terminal MKZ(6) of the three-phase power control module group is electrically connected with the terminal HG(1) of the current transformer, and the terminal HG(2) of the current transformer The terminal is electrically connected to the three-phase AC contactor KM(6) terminal and the output terminal c terminal through the electronic overcurrent protector GLJ(C1), and the three-phase power control module group MKZ(7) terminal is connected to the current transformer HG(4 ) terminals are electrically connected, and the three-phase power control module group MKZ (8) terminal is electrically connected to the current transformer HG (3) terminal. the 3. The electric motor load change automatic control power-saving device according to claim 1, characterized in that: two-phase air circuit breaker BKN1 (4) terminal, thermal protection relay RJ (97) terminal, bypass switch BL (23) terminal , intermediate relay J1 (6) end, power saving switch JD (11) end, three-phase AC contactor KM (13) end, three-phase AC contactor KM (21) end, delay relay SJ (9) end and the middle Relay J1 (5) terminal is electrically connected, thermal protection relay RJ (98) terminal is electrically connected to fault signal lamp XD3 (X1) terminal, bypass switch BL (24) terminal, intermediate relay J1 (2) terminal is connected to three-phase AC contactor Terminal KM (A1) is electrically connected, terminal J1 (4) of the intermediate relay, terminal BKN2 (2) of the power-saving state protection switch is electrically connected to terminal J2 (7) of the intermediate relay, terminal JD (12) of the energy-saving switch is connected to the terminal J2 ( 6) Terminal electrical connection, the intermediate relay J2 (4) terminal is electrically connected to the power-saving state protection switch BKN2 (1) terminal, the three-phase AC contactor KM (14) terminal is electrically connected to the bypass signal lamp XD2 (X1) terminal, three Phase AC contactor KM (22) terminal is electrically connected to power-saving signal lamp XD1 (X1) terminal, delay relay SJ (5) terminal, intermediate relay J1 (3) terminal, terminal board PC (1) terminal, resistor R terminal It is electrically connected with terminal J1(7) of intermediate relay, terminal J1(8) of intermediate relay, terminal PC(3) of terminal board, the other terminal of resistor R, emergency switch BKN3(1) and electronic overcurrent protector GLJ(K1) The terminals are electrically connected, the intermediate relay J1 (1) is electrically connected to the delay relay SJ (13), the delay relay SJ (14) is electrically connected to the intermediate relay J2 (5), the input terminal N is connected to the two-phase air Terminal BKN1(1) of circuit breaker is electrically connected, terminal BKN1(3) of two-phase air circuit breaker, terminal XD3(X2) of fault signal lamp, terminal KM(A2) of three-phase AC contactor, terminal J2(8) of intermediate relay, bypass Terminal XD2(X2) of signal lamp, terminal XD1(X2) of power-saving signal lamp, terminal GLJ(K2) of electronic overcurrent protector, terminal BKN3(2) of emergency switch are electrically connected with terminal J2(1) of intermediate relay. the