The difference between single-phase, three-phase motor
Single phase voltage is 220 volts. The phase of the voltage between the zero line.Two phase is the phase of a and B or C, phase voltage is between 380, common is the use of electrical welding machine 380. Three phase is the phase to phase voltagebetween A.B.C to 380V. The use of electrical appliances is a 3-phase 380V motors orequipment. The whole of the alternating current into direct current. Motor capacitorcan not replace the exciter. Exciter stator coil and the rotor coil at the same time,sending electricity to turn the motor carbon brush with adjustable speed.
Three phase electric motor is mainly used as the power source, namely the need to turn the load. Because the three phase of three-phase power difference of 120degrees. The rotor never jam.
Just imagine: a pedal bicycle parked at the bottom, another in the highest position,this is a step on the bike leg muscles is down, it may be "stuck" (when the forcedirection and two pedal connection consistent time), or turn back, can not guarantee the forward, need to use their feet pedal change an angle.
The three-phase electricity is to form the "angle", otherwise, people don't need to make things complex three-phase electric three-phase and single-phase electricpower difference.
The three-phase electricity for industrial production, its voltage is 360V single-phase electric for ordinary residents living, the voltage of 220V three-phase power, there are4 lines of which 3 root for 220V FireWire, zero line 1 root, the city electricity will any one FireWire and zero line combination is what we usually say, and 220V power, but in order to three-phase power balance, if the recommendations may load connected to the corresponding is the best.
Can produce equal amplitude, frequency, phase difference is equal to 120 DEGpotential generator called the three-phase generator;
In the three-phase generator as the power, called the three-phase power supply;
U, V, W is called a three-phase, voltage phase line voltage, the voltage is 380v;
The center line between the phase known as the phase voltage, the voltage is 220V.
1, the difference between three-phase to single-phase power supply: the powergenerated by the generator is three-phase, point of each phase and three-phasepower supply which can form a single loop to provide electric energy for the user.Note that cannot be called positive or negative here AC circuit, it should be called the end of the line (civil electric said FireWire) and neutral (civil electric said zero line).
2, in accordance with the provisions of 380 volts (three phase) of the neutral point ofcivil power should not be grounded in the households into the end (ground, in the end of the transformer of the ground is taken into account can not be caused by the suspension point higher than the supply voltage point, grounding and transformeruser ends in the ground the earth is the existence of certain resistance), the power supply way is a live wire and a zero line (neutral pinout) form a loop in the power jacksingle-phase three core is also connected with a ground wire. This is given to realize the function of leakage protector, (the work principle of the electric leakage protectoris: if a human touch to the power line end is the live wire, or electrical equipmentinternal leakage, when the current through the body from the line of fire live electrical equipment shell into the earth, and does not pass through the zero line current live wire and zero line will not equal, the leakage protector has detected that this part of the current difference immediately after the trip to protect the personal safety and the safety of the electric, usually the differential current selection in the tens of milliamperes) if the neutral point of power supply directly to ground (which is not allowed in the civilian electrical construction), leakage protection device loses effect,short circuit cannot protect the personal and electrical equipment.
The three-phase electricity is generally 380 pay, have four lines, of which three is the root of FireWire, a zero line; the 380 volts of electricity is electricity for industrial use.
Phase is generally 220 volts of electricity, there are two lines, one is the live wire, azero line. 220 volts of electricity as civil electricity, or electricity small machinery.
Three phase electric power energy can provide more reasonable, in as a motorenergy, don't need anything else, as long as the three-phase electricity directly to the motor, the motor can run. If it is a one-way motor, but also the need to ensure themotor run in to the motor with a complicated thing to.
Is there a difference. The three-phase electricity of 380 volts. Single-phase electric220 volts. The so-called three-phase power refers to the three-phase FireWire,voltage between adjacent FireWire is 380V. no zero line. So only the three-phase loadunder the same circumstances (for example, three-phase motor), can be used for three-phase electric current vector, this time as the three-phase electrical and 0(between the three-phase electric cross at an angle of 120 degrees, so and 0) then don't need the midline (equivalent to the zero line)
Three phase asynchronous motor consists of stator and rotor, stator winding which is a three-phase symmetric winding, using symmetric power supply.
The specified child with two-phase motor phase windings of the motor 2. Two phasemotor drive and servo is divided into two categories. The use of the majority of home appliances and small electric appliances (Dan Xiang) in induction motor is a two-phase motor drive. Control of two-phase servo motor used, two-phase winding of the stator are respectively the excitation winding and a control winding differs 90 degreeselectric angle in space.
