The single phase is 220 volts. The voltage between the phase line and the neutral line. The two phases are the phase line a and b or c, the phase voltage between them is 380, and the common electrical appliance is the 380 electric welder. The three-phase is the phase-to-phase voltage of 380v between abc. The electrical appliance is a three-phase electric 380v motor or equipment. Turn the alternating current into direct current. The motor capacitor cannot replace the exciter. The exciter is a stator coil, and the motor with the carbon brush can be adjusted to rotate when the rotor coil is simultaneously powered.
Three-phase power is mainly used as the power source of the motor, that is, the load that needs to be rotated. Because the three phase differences of the three-phase power are all 120 degrees. The rotor will not get stuck.
Imagine: one pedal of the bicycle stops at the bottom and the other is at the highest position. This is when the foot force of the bicycle is down, it may be "stuck" (when the direction of the foot force is consistent with the two pedals), or Turning backwards does not necessarily guarantee that you will turn forward first. You need to change the pedal by a little angle.
Three-phase electricity is to form this "angle". Otherwise, there is no need for people to make such a complicated three-phase electric three-phase electricity and single-phase electricity.
Three-phase electricity is used in industrial production, and its voltage is 360v
Single-phase electricity is used for ordinary residents, and its voltage is 220v.
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Three-phase power, there are 4 wires, 3 of which are 220v live wire, 1 is zero wire. Combining any one of the live wire and the zero wire is the common electricity that we usually say, and 220v electricity, but for three-phase electricity. Balance, it is recommended to pick up the corresponding load if possible.
A generator capable of generating equal amplitudes, equal frequencies, and 120° phase difference between each other is called a three-phase generator;
Taking a three-phase generator as a power source, called a three-phase power source;
A circuit powered by a three-phase power source is called a three-phase circuit;
u, v, w are called three phases, the voltage between the phase and the phase is the line voltage, and the voltage is 380v;
The phase between the phase and the center line is called the phase voltage, and the voltage is 220v.
1, the difference between three-phase power supply and single-phase power supply: the power supply from the generator is three-phase, each phase of the three-phase power supply and its neutral point can form a single-phase circuit to provide users with power energy. Note that in the AC circuit, it can not be called positive or negative, it should be called the line end (the civil line is called the fire line) and the neutral line (the civil line is called the zero line).
2. According to the regulations, the neutral point of the 380 volt (three-phase) civil power supply should not be grounded at the entrance end (grounding at the transformer end, this grounding is considered to be a point that cannot be higher than the power supply voltage due to the floating point. Bit, the grounding of the user end and the grounding of the transformer end have a certain resistance in the earth), the power supply mode is a live line and a neutral line (neutral point lead line) constitute a loop, in the single-phase three-core power jack There is also a grounding wire in the middle. This is to take into account the realization of the function of the leakage protector. (The operating principle of the leakage protector is: if there is a line that the human body touches the power supply, that is, the live line, or the internal leakage of the electrical equipment, then the current flows from the live line through the housing of the human body electrical equipment. The earth, not flowing through the zero line, the current of the live line and the neutral line will be unequal. The leakage protector detects the difference in current and immediately trips to protect the safety of the person and the appliance. Generally, the difference is selected in the tens of milliamps) If the neutral point of the power supply is directly grounded (this is not allowed in civil power construction), the leakage protector will lose its function and will not protect the short circuit between the person and the electrical equipment.
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Three-phase electricity is generally 380, there are four lines, three of which are fire lines, one is zero line; 380 volts is used as industrial electricity.
Two-phase electricity is generally 220 volts, there are two wires, one of which is a fire wire and one is a zero wire. 220 volts of electricity is used as civilian electricity, or small mechanical power.
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Three-phase electricity can provide a more reasonable power source. As a motor energy source, no other things are needed. As long as the three-phase electricity is directly connected to the motor, the motor can operate. If it is a one-way motor, you need to add a complicated thing to the motor to ensure the motor is running.
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There is a difference. Three-phase electricity 380 volts. Single phase electricity 220 volts. The so-called three-phase power refers to the three-phase live line, and the voltage between adjacent live lines is 380v. There is no zero line. Therefore, only three-phase load (for example, three-phase motor) can be applied to three-phase power. The current vector sum of the phase current is 0 (the three-phase electricity is 120 degrees from each other, so the sum is 0). There is no need for a neutral line (equivalent to the zero line).
The three-phase asynchronous motor consists of a stator and a rotor, and its stator winding is a three-phase symmetrical winding using a symmetrical power supply.
A two-phase motor designates a motor with a 2-phase winding. Two-phase motors are divided into two categories: drive and servo. The (single-phase) asynchronous motor used in most household appliances and small appliances is a two-phase drive motor. For the two-phase servo motor for control, the two-phase windings of the stator are respectively the excitation winding and the control winding, which are different in space by 90 degrees.
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