They deteriorate the characteristics during operation

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Is not less than that of three-phase motors, and when the auxiliary winding is switched on via a capacitor and a step-up transformer (Fig. 35% of the starting torque of a three-phase motor. Motors with an auxiliary winding

only during starting, although they have an increased starting torque, (reduced power, worsened power factor, etc.). Their power is on average 40-50% of the power of a three-phase motor of the same size. The best indicators are motors with an auxiliary winding constantly connected via a capacitor.

Their power reaches 70% or more of the power of the corresponding three-phase motor. In this case, the capacitor is selected based on the conditions for obtaining the best data (obtaining a circular rotating field) in iraq telegram data the operating mode (the highest power factor and efficiency). In this case, the starting torque is somewhat reduced compared to the values ​​​​specified above for the starting auxiliary winding.

The number of turns of the auxiliary winding is taken close (0.8-1.2) to the number of turns of the working winding. The presence of two capacitors - one is switched on only during the start-up, and the second - constantly, allows to obtain a single-phase asynchronous motor with high starting and operating parameters.

The working winding usually occupies 2/3 of the number of stator slots, the auxiliary 7s. The axes (middle) of the coil groups of the working and auxiliary windings should be shifted by 90 relative to each other el. Deg., i.e. by half the pole division.

To make a single-phase winding in the stator according to Fig. 3-7, it is necessary to insert sections of the working winding into slots. Two groups of poles are formed in each working and auxiliary winding. In accordance with the above rules, sections related to one group of poles are connected in series, and the rpiynnbi themselves, depending on the number of turns in the sections and the operating voltage, are connected in series or in parallel.