After three-phase alternating current is supplied to a three-phase motor, a rotating magnetic field is generated, which cuts the rotor winding.
1. First of all, we must distinguish the head and tail of the three sets of motor coils. Since this is a modified circuit, special attention should be paid to the head and tail markings of the coils.
2. Then start wiring. The details are as follows: Connect the first green wire and the tail wire ** in parallel to the hole of the wiring strip.
3. Then connect the red wire of the head and the blue wire of the tail into the other hole of the row seat.
4. Then connect the first wire ** and the red tail wire in parallel to the third hole of the row seat. The above steps are actually changing the coil of the 3-phase motor from star connection to delta connection. That is, three sets of coils are connected head to tail to form a triangular connection.
5. Since there are many wires, connect the 6 motor wires on one side and connect 2 power wires on the other side of the row seat. This is the 220 volt power input terminal. When the direction is uncertain, the two wires can be connected to the two holes. Insert into the holes on both ends as shown in the picture.
6. Next, connect the working capacitor to the circuit. That is to say, one wire of the capacitor and the power wire are connected to one hole, and the other wire of the capacitor is connected to the middle hole of the seat row. This constitutes the 2 windings necessary for the operation of a single-phase motor.
7. Finally, connect the start capacitor. Because the power is relatively large, a large capacitor must be connected, that is, one lead of the starting capacitor and one lead of the running capacitor are connected in pconnects to the power terminal.
Note:
Three-phase alternating current is a form of electrical power transmission. Three-phase electricity is a group of equal amplitudes and equal frequencies. , and the three-phase alternating current in mutual phase with a difference of 120° is generated by a three-phase generator with three windings and is a commonly used power supply in industry.
The difference between three-phase power and single-phase power: The power generated by the generator is three-phase. Each phase of the three-phase power supply and its neutral point can form a single phase. -phase loop to provide energy to users.
Convert a 3-phase motor to a 2-phase motor
Select two live wires from the 3-phase power supply and match them with neutral. wire to form a two-phase power supply. Two-phase electricity has a long historybeen replaced by three-phase electricity and is no longer used.
If you are asking about regular household electricity, it is actually single phase electricity. That is, you simply select a live wire and a neutral wire from the three-phase electrical terminal, and conduct two of them. Outgoing wires. Single-phase electricity 220V.
Detailed information
The advantage of two-phase electricity over single-phase electricity is that it can start on its own. Today's single-phase motors can be started using the auxiliary winding. In the early days of electrical engineering, two independent phases were easier to analyze and design. It was not until 1918, with the invention of symmetrical components, that engineers could easily analyze multiphase unbalance conditions.
The most obvious advantage of three-phase power is that it requires trreduces energy consumption and saves money. Three-phase power only requires three-phase wires and does not require a neutral wire (the currents cancel each other out). Two-phase electricity requires four wires, but the transmission capacity is low. Therefore, in commercial electrical systems, three-phase power has replaced two-phase power and become the standard.
In addition, three-phase power generation is stable and there is no power oscillation. The rotating shaft of single-phase and two-phase electric generators will make a loud noise and the transformer will make noise due to magnetostriction.
References:
How does three-phase electricity become two-phase electricity?
< p>First, change the wiring method:1. Editiez the connection method of the three-phase winding, that is, the original star connection is still a star connection, and the original angular connection is still an angular connection. Two of the three output terminals of the original three-phase motor connection are connected to both ends of the power supply (live wire L, neutral wire N), and the remaining terminal is connected before the capacitor.
2. The other end of the capacitor is connected to one end of the power supply. Whether it is connected to the live wire or the neutral wire depends on the direction of rotation required. Different connection direction is different.
2. Capacitor selection:
1. When starting under heavy load, use two capacitors, one for starting and one for running.
2. For light load starting, only one working capacitor is required. For more details, please contact usRefer to the connection method of the phase electric motor.
Three. Selection of single-phase motor capacity:
1. Working capacity: For a three phase star connected motor, the working capacity is 0.06 × power and the working capacity of a 1000 watt motor. the motor is 60UF.
2. The operating capacity of the motor with three-phase winding angle connection is equal to 0.1 × power, and the operating capacity of the 1KW motor is 100UF.
The starting capacitor, regardless of motor connection, is calculated to be approximately 2.5 times the general capacity of the running capacitor. After calculation, a capacity of 2 to 3 UF is provided for each 10 W.
Diagram of the method of three-phase to two-phase electricity
The conversion between the two can be achieved using a transformer.
The transformer is a device that uses the principle of electromagnetic inductionto modify the alternating voltage. Its main components are the primary coil, secondary coil and iron core (magnetic core).
The main functions are: voltage conversion, current conversion, impedance conversion, isolation, voltage stabilization (magnetic saturation transformer), etc.
According to the purpose, it can be divided into: power transformers and special transformers (electric furnace transformers, rectifier transformers, industrial frequency test transformers, voltage regulators, mining transformers, audio transformers, medium frequency transformers, high frequency transformers, impact transformers, instrument transformers, electronic transformers, reactors, transformers, etc.).
Detailed information:
The difference between three-phase electricity and two-phase electricity :
The eleThree-phase electricity is A.B.C., the phase-to-phase voltage is 380V. , and the two-phase electricity is the phase line, and the neutral voltage is 220V. The two-phase electricity is two wires, one is fire and the other is zero, which corresponds to ordinary 220 V.
Three-phase electricity is used by users with relatively high energy consumption. Taking any phase and one zero is 220V, taking two phases is 380V, and it should be distinguished according to the label of the electrical appliance. device.
General house access lines have a total power supply of 220V, but some buildings also have a three-phase junction box, designed by designers considering that users can to use.
The difference between three-phase power and two-phase power: The power generated by the generator is three-phase. Each phase of the power supplythree-phase entation and its neutral point can form a single one. -phase loop to provide energy to users.
Note that in the AC circuit here, it cannot be called the positive pole or the negative pole. It should be called the end of the line (called the live wire in civil electricity) and the neutral line (called the neutral line). neutral line in civil electricity).
Reference materials:
The method of converting three-phase electricity into two-phase electricity is as follows:
1 It is necessary to distinguish the head and tail of the. three sets of motor coils Since this is a modified circuit, pay close attention to the coil head and tail markings.
2. Start the wiring and connect the first green wire and the last wire** to the hole in the cable stripage.
3. Connect the red wire to the head and the blue wire to the tail into the other hole of the row seat.
4. Then connect the first wire ** and the red wire to the third hole of the row seat. The above steps are actually changing the coil of the 3-phase motor from star connection to delta connection. that is, three sets of coils are connected head to tail to form a triangular connection.
5. Connect the working capacitor to the circuit, that is, one wire of the capacitor and the power wire are connected to one hole, and the other wire of the capacitor is connected to the middle hole of the row, thus forming a circuit. There are 2 windings required for the operation of the single phase motor.
6. Connect the start capacitor, use a wire from the bottom end of the switch and connect it to the center hole connected to the run capacitor, so that a complete circuit is connectedwith success.