Power supply of low-voltage electric motors from a 220 V network. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electric motors
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In practice, it becomes necessary to power low-voltage electric motors from a 220 V network. This can be done using a capacitor connected in series with the electric motor according to the circuit shown in the figure.
Capacitor C1, connected in series with the motor M, serves to dampen excess voltage. Its capacity is calculated by the formula:
C(uF)=3180Idv/(Uс2-Udv2)0,5,
where Idv - operating current of the electric motor; Uс - network voltage; Udv - motor voltage.
Having assembled the circuit for connecting the electric motor, connect the load to it. After turning on SA1, the voltage on the electric motor is measured with an avometer. If it differs from the voltage for which the electric motor is designed, the capacitance of the capacitor C1 is selected.
Capacitor C1 type MBGO-2, MBGP-2 or K75-11 for a voltage of at least 400 V. SA1 switch - toggle switch TV 1-2.
Author: V.F. Yakovlev
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