How thick is the wire needed for a 3 Kilowatt single-phase motor
A 3-kilogram single-phase motor required about 10 square millimeters of wire. However, when choosing the wire specifications, factors such as the length of the wire, the environmental temperature, and the installation location of the wire needed to be considered. If the length of the wire is long, the ambient temperature is high, or the wire is installed in a special location (such as passing through a wall or a pipe), a larger wire may be needed to ensure the normal operation of the motor. Read more exciting novels for free
Single-phase 6-wire single-capacity motor
Single-phase 6-wire single-capacity motor, in which 6 wires contain 3 coil, can connect one end of the 3 coil together, the remaining 3 wires, one is connected to the live wire, one is connected to the capacity, and one is connected to the neutral wire. Of the six leads, two were for the main coil, two were for the auxiliary coil, and two were for the centrifugal switch. The three parts, namely, the transformer, the centrifugal switch, and the starting coil, had to be connected in series to form a circuit, which was connected in parallel with the main coil to supply power. If the direction was wrong, the two ends of the main coil could be reversed. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to connect a single-phase motor to a four-wire motor
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 4.5 Kilowatt motor connected with large starting capacity
According to the relationship between the starting capacity and power of a single-phase motor, the starting capacity value corresponding to a 4.5-kilogram motor was not directly mentioned in the existing single-phase motor starting capacity and operating capacity power comparison table. However, according to the usual situation, the running capacity can be estimated to be 2 - 3uF per 100W. 4.5 Kilowatts is 4500W, and the running capacity is about 4500 div100 ×(2 - 3)=90 - 135uF. The starting capacity is usually 2 - 3 times the running capacity, so the starting capacity is about 180 - 405uF. At the same time, the working capacity can also be calculated according to the formula of GC = 1950I/UcosPi (micro-Farad)(I is the motor current, U is the single-phase power supply voltage, cosPi is the power factor, take 0.75), and then the starting capacity can be determined according to the starting capacity of 1 - 4 times the working capacity. However, since the current value is not given, it cannot be accurately calculated. In summary, the starting capacity of a 4.5 Kilowatt motor was about 180 - 405uF. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to connect three-phase and single-phase four-wire motor
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>
The difference between single-phase motor and three-phase motor
The principle difference between a single-phase motor and a three-phase motor is as follows: 1. * * Power supply **: Single-phase electricity consists of a live wire and a neutral wire. Single-phase electric motor uses single-phase power. Three-phase electricity has three phase lines, which are three-phase four-wire (three live wires and one zero wire). Three-phase electric motor uses three-phase power. 2. * * Stator winding structure and distribution ** - * * Three-phase motor **: Stator winding is composed of three-phase winding with a difference of 120 electrical angles in physical space. After the three-phase symmetrical alternating current was introduced, a theoretically circular rotating magnetic field was formed. The rotating magnetic field cuts the winding of the motor, and an induced current is generated in the winding of the motor. The current carrying conductor of the motor generates electromagnetic force under the effect of the rotating magnetic field of the motor, and the direction of rotation of the motor is the same as the direction of the rotating magnetic field. - * * Single-phase motor **: Stator winding is generally composed of a main winding and a secondary winding (taking a single phase motor as an example). The main winding and the starting winding were separated by 90 degrees in space. The starting winding was connected in series with a suitable capacity, so that the current of the main winding was approximately 90 degrees different in phase, forming a phase-splitting or phase-shifting principle. Two currents that were 90 degrees different in time and space were passed into the two winding, creating a rotating magnetic field that automatically started the generator. After starting, the speed of the engine will rise to a certain level, and the starting winding will be disconnected with the help of a centrifugal switch or other automatic control device. Only the main winding will work during normal operation. 3. * * The influence of the rotating magnetic field on the activation ** - * * Three-phase motor **: The three-phase power supply can be directly connected to the three-phase winding to generate a rotating magnetic field. This rotating magnetic field can make the motor start and run smoothly without the need for additional auxiliary devices (such as a transformer) to generate a rotating magnetic field. - Single-phase motor: When a single-phase Sinusoid current flows through the winding, it produces an alternating pulsating magnetic field. It can be seen as two rotating magnetic fields with the same speed and opposite directions. This makes the motor unable to rotate when the motor is at rest due to the two equal and opposite torques. Therefore, a special method was needed to generate a rotating magnetic field to start, such as adding a starting winding to the stators and connecting the starting winding in series (a single phase motor), or using the shaded pole method (a shaded pole motor). 4. * * Field of application **: Single-phase motor is more used in living places, and three-phase motor is mostly used in industrial fields. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
20 Kilowatt single-phase load connected to three-phase power
For the case of a 20-kilogram single-phase load connected to three-phase power, the first consideration was to convert the single-phase load into a three-phase load. Assuming that the models, specifications, and power factors of the lamps on the lighting circuit are the same (assuming that the power factor is 0.95 and the losses of the transformer are 5%), the single-phase (AC220V) 20kW-load is converted into a three-phase load. The calculation process is as follows: First, calculate the power load of a single-phase load on a certain phase (assuming that it is on phase A) as 20 kWh. Then, according to the formula, it was converted into a three-phase load, namely 3×1.05×20 Watt = 63 Watt (here, the simultaneous factor is 0.95). The calculated load Pj = 59.85 Watt, and Qj (idle power) needs to be further calculated according to the power factor. Under the three-phase four-wire power supply mode (China's main power supply mode, three phase lines and one neutral line, the voltage between the phase line and the phase line is 380V, and the voltage between the phase line and the neutral line is 220V), multiple single-phase loads should be connected to the three-phase circuit as much as possible, and they should not be concentrated in one of the three circuits. In addition, if you want to choose a cable, you need to determine it according to the calculated load current. The old technician calculated the cable size based on the total power of the single-phase load and the relevant circuit principles of the three-phase power supply. However, more parameters (such as cable material, laying method, environmental temperature, etc.) were needed to accurately determine the size of the 20 Kilowatt single-phase load and three-phase power supply cable. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How big is the cable for a 100 Kilowatt single-phase
In the cable selection, the size of the cable required for the 100-kilogram single-phase equipment needed to consider many factors. First of all, according to the power (P = 100kWh) and voltage (single-phase voltage is generally 220V), the current should be calculated by the formula: I = P / U (I is the current). Then, according to the calculated current, look up the cable ampacity meter and choose the appropriate cable cross-section area. At the same time, the laying method (such as overhead, buried, etc.) and the influence of environmental temperature on the ampacity of the cable should be considered. Generally speaking, such a large current may require a copper cable with a large cross-section area, such as a copper cable of 95 square millimeters or larger, but the specific calculation needs to be determined based on the actual situation. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Liming single-phase motor
Liming single-phase motor had many types, ranging from 6W to 100HP, such as miniature gear reduction motor (6W-120W), small gear reduction motor (1/8HP -3HP), large gear reduction motor (1/4HP-100HP), etc. Its rated voltage was 220V single-phase. For example, Limin mini gear reduction motor with ear, CGU09B10S15/CM09IG120BBF, was a single-phase 220V speed regulation motor. Liming single-phase motor applications include shooting machines, automatic library machines, indoor game machines, automatic mahjong machines, etc. In addition, for a single-phase induction motor,(Including the similar motor of Liming brand) In terms of connection, if there are three connection terminal, you can use a universal meter to measure the resistance value to determine the common end, starting end, and running end. The specific resistance value of the common end and running end is the smallest, the common end and starting end is the largest, and the starting end and running end is the largest. When connecting, the common end is connected to the zero line, the starting end is connected to one end of the capacity and then connected to the live line, and the other end of the capacity is connected to the running end. Moreover, a single-phase induction motor needed to be connected in series with a polar insensitive voltage to operate normally. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
single-phase parallel motor
The English translation of a single-phase parallel motor was "single-phase shun motor." <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
How to wire the single-chip motor
The motor wires of different power levels were different. For example, a 3KW motor corresponds to a 2.5mm2 cable, a 15KW corresponds to a 6mm2 cable, and a 45KW corresponds to a 25mm2 cable. As for the connection between the single-chip computer and the motor drive module, if it was a stepping motor, the positive pole was connected to +5V, and the negative pole was connected to GND to connect the two boards. The signal line could be connected to the single-chip computer's gno pin using the dupont wire. If the board that controlled the 8-way stepping motor only needed 4 signal lines, and it could be controlled according to the order required by the stepping motor through the control pin. However, if it involves other types of motor, such as a direct current motor, it is necessary to consider the voltage, current and other factors of the motor. For example, if the motor is directly controlled by the single-chip processor's I/O port, pay attention to the driving ability of the I/O port. If the driving ability is insufficient (such as the current is too small), it may not be able to drive the motor. In this case, a motor drive module like the L298N may be needed to assist. The different input and output ports of the L298N have different functions, such as power supply. The interface such as logic input has different connection methods under different power supply voltage in order to control the motor normally. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>