Working principle of the hottest single-phase capa

Working principle of single-phase capacitor asynchronous motor

the tap speed regulation of single-phase capacitor asynchronous motor is designed based on the development of telex. According to the need of purification equipment in different applications, there are five different speeds to reduce the noise of fans

1 working principle of single-phase capacitor asynchronous motor

as a winding produces a pulsating magnetic potential, the decomposition results in a rotating magnetic potential with equal positive and reverse sequence amplitudes, opposite steering, and equal speed. When z=0, the positive and negative starting torque phases only need to be offset by static tension test in principle, and cannot be started. Therefore, it is necessary to configure (with capacitors in series) the secondary winding, so that the elliptical magnetic potential rather than the pulsating magnetic potential can be obtained from the winding set-up data of the motor under the condition of z=0. This ensures the starting torque, that is, the split phase starting of the capacitor

single phase capacitor asynchronous motor is a rotating magnetic field produced by the combined action of main and auxiliary windings with different time phase currents with a space difference of 90 ° electrical angle

conditions for two-phase winding to generate circular rotating magnetic potential:

(1) the axes of the main and secondary phase windings differ by 90 ° in space:

(2) the ampere turns of the main and secondary phase windings should be equal, that is, the magnetic potential generated by i1w1=i2w2 is also equal:

(3) the current in the main and secondary phase windings differs by 900 ° in time phase

when one or more of the above three conditions for generating circular rotating magnetic potential are not met, The magnetic potential of these two windings is the elliptical rotating magnetic potential. But usually:

(1) the magnetic potential of the main and auxiliary windings is different i1w1 ≠ i2w2

(2) the installation position in the main and auxiliary phase windings is also different: but the current installed near the screw rod is more accurate than that installed on the electromechanical, and the phase difference of the current is not 90

in general, the interior is an elliptical magnetic potential, and even a circular magnetic potential is a circular magnetic potential only when the symmetry condition is satisfied at a certain speed. A motor with elliptical magnetic potential inside can also work, but its performance is not as good as that of circular magnetic potential. For an elliptical magnetic potential, it can be regarded as the joint action of a positive sequence circular magnetic potential and an inverse sequence circular magnetic potential

as shown in Figure L, this capacitor is not only used for motor starting, but also used from the end of motor starting to normal operation, so it is a single-phase capacitor asynchronous motor