1, because the 220V power supply is very convenient and economical, and the domestic electricity consumption is also 220V, single-phase motors are not only used in production, but also closely related to people's daily life, especially with the increasing improvement of people's living standards, the consumption of single-phase motors for household appliances and equipment is increasing.
2. In terms of production, there are micro-pumps, refiners, threshers, shredders, woodworking machinery, medical instruments and so on. There are electric fans, hair dryers, exhaust fans, washing machines, refrigerators, etc. There are many kinds, but the power is small.
Extended data:
1, BO2 series? Single-phase resistance starting asynchronous motor. The power is between 60-370 w, and it is characterized by using the resistance of the secondary winding itself to start, without adding any phase-splitting elements, and using the centrifugal switch to cut off the secondary winding at the end of starting. Simple structure. Moderate starting torque and strong overload capacity, suitable for small machine tools, blowers and medical machinery.
2.CO2 series? Single-phase capacitor starting asynchronous motor. The power is between 120 ~ 750 W, and it is a single-phase motor, which is started by increasing the starting torque by means of external capacitor.
An additional capacitor is connecte in series in that secondary win, and at the end of start-up, the secondary winding and the capacitor are cut off from the power supply together with the centrifugal switch, which, like the BO2 type, becomes a state in which only the primary win runs and the secondary winding is idle. Capacitive starter motor has high starting torque, but medium overload capacity. Suitable for air compressors, refrigerators, washing machines, mills, threshers and water pumps.
3、DO2？ Single-phase capacitor motor. It is a single-phase motor started by a capacitor, and the secondary winding, capacitor and main winding participate in the operation together. Therefore, a centrifugal switch is not needed. After proper design, the motor can form an ideal rotating magnetic field when running, so the motor has good running performance, high efficiency, high power factor and low noise. Its power range is 4 ~ 250 w.
Because a capacitor is used to give consideration to both starting and running, and to weigh the disadvantages of braking, because the starting time is very short, only when choosing the capacitor value, try to meet the needs of long-term operation, and then choose a cheap low-value capacitor, so the starting torque of this motor is low, and it can only be used for machinery that starts with no load or light load, such as electric fans, ventilator, tape recorders, etc.
4. Binary capacitor motor? At present, there is no official model of this kind of motor in China, but it is also in production. The maximum power of the motor is 750W, which is about 1kW. There are more powerful ones abroad. Because of the high power, the required capacitor is much more expensive. This kind of motor has good starting performance and running performance. Characters are used in household appliances and small machine tools.
References:
Baidu encyclopedia-single-phase electric machinery
References:
Baidu encyclopedia -kW