Starting a three-phase motor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Electric motors
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Some radio amateurs use a drive from a three-phase motor with capacitor switching for their designs. For normal operation, which excludes a strong overload of the winding connected through the capacitor, it is necessary to turn off the starting capacitor after the engine is accelerated, leaving the working capacitor on.
A simple device is proposed that allows you to perform the operation of switching off the starting capacitor automatically (see figure). Normally closed contact of the relay after the acceleration of the engine, when the voltage on the capacitor plates increases, opens.
In the device used to rotate the antenna, the following are used: a three-phase motor with a power of 270 W for a voltage of 220 V; capacitors starting C1 and working C2 - with a paper dielectric; relay P1 type MKU-48 for 220 V.
Other types of relays can also be used in the circuit, including a DC relay. When using a DC relay, the relay winding should be fed through a rectifier by shunting it with an electrolytic capacitor.
Author: V. Potseluev (UA9VX), Novokuznetsk, Kemerovo Region; Publication: N. Bolshakov, rf.atnn.ru
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