In today's world, it is impossible to do without a variety of electric motors. These are huge motors that make machines rotate and very small microwaves that rotate the pan. But all these electrical appliances require DPS capacitors . Unfortunately, over time they lose their capacity and the motors stop working. Usually in such cases they are replaced with new ones. Let's find out why capacitors are needed in motor control circuits.
Why are capacitors needed?
In modern devices, both three-phase and single-phase electric motors are used. There are schemes when a three-phase motor is included in a single-phase circuit. It is in such circuits that the mandatory inclusion of phase-shifting capacitors, which ensure the start of the engine. If the capacitance of these capacitors decreases, then the motors stop starting. In single-phase motor circuits, capacitors provide an increase in motor power, and if they fail, the motors lose their power.
Also, such capacitors are installed in motor control circuits to ensure network noise immunity from motors.
The use of capacitors in starting circuits of electric motors
When choosing the required capacitors, their parameters must be taken into account. There are two such parameters in total:
- the nominal capacitance of a capacitor is measured in microfarads
- rated voltage is measured in volts.
For networks with a single-phase voltage, it is enough to install capacitors with an operating voltage of 250 volts. If it is necessary to connect the motors to a 380 volt network, then the operating voltage is selected on the order of 450 volts. Thus, the network noise immunity is ensured, as well as a smooth engine start.
