phase connect

In the three-phase four-wire distribution network, 220V single-phase circuit can be connected. The connection method was to connect a wire from any of the three phases and four wires, and then connect a wire from the neutral line, so that the voltage between the two was 220 volts, thus forming a 220V single-phase circuit. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Connection of the three-phase motor: According to the power supply voltage and nameplate identification, the three-phase motor is connected to the star connection or the angle connection in the junction box. There were two rows of six terminal blocks in the junction box. When star connection was used, the three terminal blocks on the top of the junction box were short-circuited with a short-circuit piece, and the three terminal blocks on the bottom row were connected to the three-phase power supply respectively. When corner connection was used, the upper and lower rows of terminal blocks were connected vertically, and then the three-phase power supply was connected respectively. Single-phase motor connection: For a single-phase motor with relatively small power (such as a fan, washing machine, etc.), one end of the primary and secondary coil is connected together, and three terminal are led out. Only one voltage is needed (the starting voltage and the running voltage are integrated). Use a Multimeter to measure any two of the three terminal blocks of a single-phase motor. Three sets of values can be obtained. The two terminal blocks with the largest resistance value of the capacity and the two terminal blocks with the small resistance value of the zero line and the live line (the zero line and the live line can be interchanged). If you want to reverse it, you can change the line connected to one end of the capacity to the other end of the capacity. For a single-phase motor with high power, the main and auxiliary coil were separated, and the centrifugal switch had a total of 6 connecting terminal. First, ensure that the motor winding terminal was arranged in a specific way. At this time, the resistance of the two terminal of the auxiliary winding was the largest, the resistance of the two terminal of the main winding was second, and the resistance of the two terminal of the centrifugal switch was 0 Omega. Then, the connection was made according to the regulations. If the motor was to be reversed, the connection method of the specific connecting terminal needed to be changed. However, the connection method of four-wire motor to connect three-phase and single-phase was not found. If the four-wire motor refers to the motor connection under the three-phase four-wire system, the three-phase connection shall be based on the above-mentioned connection method of three-phase motor. For single-phase, you can refer to the connection method of single-phase motor and take one phase of live wire and zero wire from the three-phase four-wire for connection. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were different types of single-phase motor, and the method of connecting the voltage to the voltage was also different: 1. ** General Judgment Method **: - The single-phase motor had a main coil and a secondary coil. The resistance of the main coil was smaller than that of the secondary coil. Usually, the connection method can be determined by measuring the resistance between the motor leads. The two wires with the highest resistance were connected to the power source. 2. ** Connection under different starting modes ** - ** Split-phase start type **: suitable for electric fans, air-conditioner fan motor, washing machine and other motor. The auxiliary starting winding is used to assist the starting. The starting moment is not large, and the running speed is roughly maintained at a fixed value. - ** Starting method with centrifugal switch (two conditions)**: - In the first case, when the motor is still, the centrifugal switch is connected. After the power is supplied, the starting capacity will participate in the starting work. When the speed of the motor reaches 70% - 80% of the rated value, the centrifugal switch will automatically trip, and the starting capacity will be disconnected. The starting winding will not participate in the operation work, and the motor will continue to operate with the running winding coil. - In the second case, when the motor is still, the centrifugal switch is connected, and the starting capacity is involved in the starting work after the power is supplied. When the speed of the motor reaches 70% - 80% of the rated value, the centrifugal switch will automatically trip, and the starting capacity will complete the task and be disconnected. The running capacity is connected to the starting winding in series to participate in the operation work. This kind of connection was generally used in places with large and unstable loads such as air condensers, cutting machines, and woodworking machines. 3. ** Connection of the motor with different number of lead wires ** - ** 3 wires of AC 220V induced draft fan (motor as an example)**: First measure the values between the wires of the motor, such as red and blue resistance 381, red and yellow resistance 828, yellow and blue resistance 447. Since red and blue 381+ yellow and blue 447 = red and yellow 828, it can be judged that the starting winding has a high resistance (red and yellow wire) and the running winding has a low resistance (red and blue wire). Then connect the red and yellow wire to the capacity and the red and blue wire to the power supply. - ** Four wires of AC 220V motor (connection method)**: measure the value between each two wires respectively. For example, the resistance value of green and black is 0, the resistance value of red and black is 2.57, the resistance value of red and yellow is 0, and the resistance value of yellow and green is 2.65. The resistance value between green and black and red and yellow is infinite, which means that it is impossible. There are clear values between red and black and yellow and green, which means that there are two separate sets of winding and they are not connected. The yellow and black wires could be connected together as the common end, and the capacity could be connected to both ends of the red and green wires. The common end wire and any of the red and green wires could be connected to the power supply, and the motor with positive and negative rotation could be obtained. - ** AC 220V single-phase double-cap motor **: Pay attention to the selection of starting and running caps. The larger capacity was the starting capacity, and the smaller capacity was the running capacity. After the motor starts, the centrifugal switch disconnects the starting capacity from the circuit. If there is a lack of starting capacity, the motor will be difficult to start or unable to start (often manifested as normal no-load start, but unable to start after loading); if there is a lack of running capacity, the motor can start, but the output power will be reduced (often manifested as reduced load capacity). Generally, the starting capacity was connected in series to the starting winding of the single-phase motor and in parallel with the working winding. In addition, if the motor needs to be reversed, for the above-mentioned connection method, it is only necessary to swap the wires of the corresponding winding. In some cases, the 1 - 2 wire swap or the 3 - 4 wire swap can complete the reversal. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

For the single-phase fan motor winding connection, the first thing to do was to determine the main and auxiliary winding of the motor and the common wire. The resistance between the three wires of the motor could be measured by a Multimeter. Three different resistance values would be obtained. The two wires with the highest resistance value were the sum of the resistance values of the main and secondary winding, and the remaining wire was the common wire. Then, the common wire was used to measure the resistance of the main and secondary winding respectively. The lower the resistance, the main winding would be the main winding, and the higher the resistance, the secondary winding would be the secondary winding. If it was a three-wire motor, the resistance between the two could be measured by a Multimeter. The two wires with the largest resistance were connected to the capacity, and the remaining wire was connected to the neutral line of the power supply. Finally, the direction of the motor could be adjusted by connecting the live wire to any one of the two capacity wires. If it was a 5-wire motor, black and yellow would be a group, and red, white, and blue would be a group. The black and yellow wires were connected to the power supply, while the yellow wire was connected to the power supply. Red, white, and blue corresponded to the three speeds. Red corresponded to fast speed, white corresponded to medium speed, and blue corresponded to low speed. There was another method of connection: the live wire was divided into two paths, one path to the main winding and then back to the neutral line, and the other path to the secondary winding and back to zero. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Two-phase motor single-capacity four-wire connection method is as follows: 1. The main coil of the two-phase motor was connected to L1 and L2 of the power supply. 2. The auxiliary coil of the two-phase motor was connected to L1 of the power supply. 3. One end of the transformer was connected to L2 of the power supply, and the other end was connected to the auxiliary coil of the two-phase motor. 4. A starting reactor is connected between the main coil and the auxiliary coil of the two-phase motor. 5. Ground the casing of the two-phase motor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

In the five-wire single-phase motor, three wires were the main wire, one was the starting wire, and one was the auxiliary wire. Generally, the following methods can be used to connect the voltage: First, distinguish the main winding, the secondary winding, and the starting line of the motor. Generally speaking, the main winding was connected to the power supply, and the secondary winding was connected to the voltage. For the case of five wires, it could be judged by measuring the resistance value first. The two wires with the highest resistance value were connected to the capacity (one of them was the secondary winding wire, and the other was the auxiliary wire such as the starting wire), and the one with the lowest resistance value was connected to the power supply of the main winding wire. If you want to change the direction of the motor, you can swap the specific wires in the motor's lead wire (such as swapping the wire connected to the transformer with other related wires), but the specific operation still needs to be carefully adjusted according to the actual structure and function of the motor. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

There were two ways to connect the four wires of a single-phase motor, the star connection and the triangle connection. Star connection is mainly used for low-power motor, starting current is small, but starting moment is also small; triangle connection is mainly used for high-power motor, starting current is large, but starting moment is also large. You can check the label on the motor shell or check the motor manual to determine the motor's connection method. Generally speaking, the star connection is marked with "Y" or "Delta/Y", and the triangle connection is marked with "Delta" or "Y/Delta". It should be noted that among the four wires of the single-phase motor, the main wire is the power supply wire of the motor, and the auxiliary wire is used to start the motor. There were four wires because the single-phase motor needed to be started by a starting reactor or a starting reactor. These starting components needed to be connected to the motor, thus increasing the number of wires in the motor. If the four wires of the single-phase motor were connected wrongly, it might cause the motor to fail to start normally or damage the motor. If you find that the connection is wrong, you should stop using it in time and ask a professional to repair and correct the connection. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Single-phase electricity referred to the lighting electricity used in daily life. One of the three-phase electricity was used to supply power to electrical equipment (such as household appliances), and the other line was the neutral line drawn from the neutral point of the three-phase electricity. Its voltage to ground was 220V. Three-phase electricity was a form of transmission of electrical energy. It was a power source composed of three alternating electric potentials with the same frequency, equal amplitude, and 120° phase difference. The voltage between the three wires of three-phase electricity was 380V. Most of the AC electrical equipment in the industry (such as electric motor) used three-phase AC. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

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