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Why motor capacitor

by:SMiLer     2022-01-10
Why many need capacitor motor start-up time? Simple said capacitor is a phase difference, and to generate a asynchronous motor magnetic field, rotating motor. By the main winding single-phase asynchronous motor ( Also known as running winding) And the auxiliary winding ( Also known as the startup winding) Of the two windings on the space difference between 90 & deg; Electric point of view. Capacitor after the split phase two winding ventilation with different phase alternating current (ac), will be rotating magnetomotive force generated in the motor. If only access to main winding single-phase ac motor for pulse generated by the magnetomotive force, it can be broken down into two equal and same speed, towards the opposite rotating magnetomotive force. The two steering instead of joint action in rotor magnetomotive force field, electromagnetic torque generated in a resting size is equal, in the opposite direction, and therefore cannot be started. If the main winding and vice winding equals the number of turns, spatial difference between 90 & deg; Access to electrical point of view, 90 & deg; Phase alternating current (ac), the motor can produce in the round rotating magnetic field, the motor rotor under its role with its rotation. If two winding asymmetry, bubbled into its current phase difference is not equal to 90 & deg; , generated by the motor for the ellipse rotating magnetic field, it is decomposed into a large and a small round rotating magnetic field, they equal speed in the opposite direction, the motor rotating direction of magnetic field along the larger magnetomotive force. Change first deputy winding end ( Or the end of the primary winding) Can make the elliptic rotating magnetic field in the direction of change, the motor can be reversed. But at the same time will not change the end of a change in the first two winding motor. Single-phase motor must have two sets of space for 90 & deg; Electrical Angle of winding, and pass into the has certain phase difference of alternating current will produce a rotating magnetic field, the motor will start and along the rotating magnetic field to the rotation on its own. Strictly speaking, not for different high and low voltage motor, 220 v, 380 v just short for our daily, here, it should be said of single-phase and three-phase. Ac motor rotation depends on current produce a rotating magnetic field. Three-phase motor through 120 degrees is the difference in phase and three phase current, can produce a rotating magnetic field. And single phase motors through the single phase current does not produce a rotating magnetic field, need to take some methods to make it produce a rotating magnetic field, using capacitance is one method, capacitance is the most common method is used to split phase, the purpose is to make two spare set of the current produce nearly 90 ゜ phase difference, in order to produce a rotating magnetic field. Three-phase electricity, each current itself has a phase difference between two phase, there is no split phase. Two winding capacitance induction motor, the startup winding and winding operation. Two windings by 90 degrees on the space. String on the startup winding capacity of a large capacitor, when running and start the windings by single alternating current (ac), because of capacitor in the startup winding current on time than the running winding current advance Angle of 90 degrees, to reach the maximum value. In time and space form two of the same pulse magnetic field, make the air gap between the stator and the rotor produces a rotating magnetic field, under the effect of rotating magnetic field, the induced current in the motor rotor, current and rotating magnetic field interact to produce electromagnetic torque, motor rotation. Single-phase ac motor to add capacitor to the cause of the starting operation: 1, the operation of the single-phase motor winding, can only produce pulsating magnetic field corresponds to the motor stator any electromagnetic fields, can only at this point including polarity changes direction and amplitude changes. Namely, unable to form a rotating magnetic field. 2, adding a starter in the stator winding, starting with the main windings by 90 degrees on the space. Starting winding concatenated after a suitable capacitance, the equivalent circuit of the winding resistance becomes the inductance and capacitance in series circuit, as long as the capacitance value to meet current phase Angle leading voltage certain Angle, such as 30 degrees; At the same time, if the operation of the perceptual winding current hysteresis voltage 60 degrees, the two winding current phase difference to reach 90 degrees, the so-called split-phase principle. These two on the time difference between 90 degrees of electricity flow into the two differ 90 degrees of winding on the space, will be produced in the space ( Two phase) Rotating magnetic field, the motor to spin the course.
ac start capacitor ac motor capacitor is generally used to dual start capacitor.
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