Capacitor Motor

Single phase capacitor motors are widely used in household appliances such as water pump , washing machine, freezer, air conditioning . Simple construction with small resources and working with electricity supply voltage 220 V, therefore making the capacitor motor is widely used in household appliances.

Stator winding consists of the main winding terminals U1-U2 notation, with the notation and auxiliary winding terminals Z1-Z2-mesh nets connected to the terminals L1 and U1, and the neutral wire connected to the terminal N U2. Capacitors work function to the main winding phase angle difference with the auxiliary winding approaching 90 °.

Setting the direction of motor rotation can be done with a capacitor (see figure):

• To produce rotation to the left (counterclockwise) working capacitor CB connected to the terminals U1 Z1 and Z2 and the terminal is coupled with the terminal.
• Round to the right (clockwise) a capacitor connected to the terminal work Z1 and Z2 terminals U1 and U1 is coupled with the terminal.





Capacitor motors with power above 1 kW is equipped with two capacitors and one centrifugal switch. U1-U2 primary winding is connected with the netting L1 and Neutral N. Z1-Z2 auxiliary winding connected in series with the capacitor CB job, and a starting capacitor CA serial with contacts normally close (NC) of the centrifugal switch, see figure .

Initially the main winding, and auxiliary winding voltage gain from the netting L1 and Neutral. Then two capacitors CB and CA, both of which form a closed loop so that the rotor began to spin, and when the rotation approaches 70% nominal speed, the centrifugal switch contacts will open and close normally decided auxiliary capacitor CA.




The function of the two capacitors are connected parallel, CA + CB, was to increase the initial torque value to lift the load. After reaching 70% of motor rotation, the centrifugal switch is disconnected so that only the working capacitor CB are still working. If the two capacitors is damaged then the motor torque will decrease drastically, see figure





Examples of the use of motor capacitor is on the electric water pump and compressor.