When two windings are connected in parallel to a single-phase AC power supply, the phase angle ω2 of the current I2 flowing through the starting winding is smaller than that of the voltage U, while the phase angle ω 1 of the current I 1 flowing through the running winding is larger than that of the voltage U. ..
Therefore, the single-phase current is divided into two-phase current, and the phase difference ω = ω 1-ω 2. Although the difference between these two currents and the two-phase current is not 90 degrees, their phase angle difference ω is enough to generate a rotating magnetic field with the same properties as the two-phase current.
After the resistance split-phase motor is successfully started, the starting winding must be disconnected, and it will overheat and burn out after working for a long time.
Starting circuit diagram of resistance split-phase motor;
Extended data:
Single-phase motor refers to asynchronous motor powered by 220V AC single-phase power supply. Because the 220V power supply is very convenient and economical, and the domestic electricity consumption is also 220V, the single-phase motor is 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 is also increasing.
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.
Reference source: Baidu Encyclopedia-Single-phase Motor