On the role of motor start capacitor in the motor?

Common to use capacitance on general motors, single-phase motor is started, the capacitance is also called the startup capacitor, look from the circuit principle, it is have the effect of the phase shift, because only a group of running winding single-phase motor, rotor squirrel cage, single-phase electric cannot produce rotating magnetic field, need to cooperate with another group to start winding, because only single-phase 220 v alternating current (ac), so in the startup winding in series with a capacitor, capacitance is the feature of voltage cannot mutation, so start ahead of coil current run will coil 90 & deg; So that I can on the space form two rotating magnetic field, so that the motor started normally, please attention: capacitor

single-phase motor stator two groups, difference between 90 degrees on the space, start and run the windings, respectively, can be obtained by 90 degrees of current, at startup capacitor under the action of phase shift, single-phase electric start winding and run will the current difference between 90 degrees out of phase winding, the rotating magnetic field generated in the stator space, and the rotor would cut lines and generate an electric current, then there will be a rotating magnetic field, rotor stator magnetic field interaction, the rotation of the rotor can be continuously.

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some of the dc motor are also in a capacitance in parallel on both ends of the armature, the capacitance is primarily filter and anti-jamming. Because the carbon brush dc motor, carbon brush and commutator segments open when produce peak voltage, capacitance coupled with go to, can release the voltage, of course, there are some in the carbon brush and the indirect capacitance can also play a similar role.

is a good reactive compensation capacitance of motor, the motor is perceptual load and power factor is lower, after using the power supply room requires use of capacitors for reactive power compensation. And distance of the reactive power compensation loss is bigger, effect is not very good, so sometimes need to near the motor directly do start wattless situ compensator, such as under the star triangle starting circuit, capacitance to complete this function is added to it.

in situ reactive compensation, direct let smaller power consumption, power factor significantly promoted, fully dig up the potential of the power grid transmission.

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