In detail the structure of the motor starting capacitor, a lot of electrician don't understand

As an electrician, everyone must have know three-phase ac motor and single phase ac motor is different, just a little care can be found that the single phase ac motor is more than the three-phase ac motor is a gear, it is start capacitance, more common is all kinds of household appliances, household electrical appliances have motors usually have start capacitance. Today, as we simply discuss start under the principle of capacitance, if in a very professional point of view, it is without question in the endorsement, and be a bit boring, do the electrician knows that there are a lot of practical experience and book knowledge, so today just talk about some personal experience.

if you want to understand the jargon, can query the professional information on this.

once chat with a wang electrician, speaking of startup capacitor, he feel start capacitance is the motor start to give a thrust, the motor for electric function in moving that instant, the rotation for thrust up and don't have the thrust, can cause single phase ac motor at startup initialization, only at the origin jitter, instead of turning, the capacitance is single-phase ac motor & other; Driver & throughout; , without it, there is no drive, magnetic field will not be able to play a role in the rotor, rotary nature is also talk.

the wang electrician said easy to understand, but always feel a little is not enough, so a li electrician expounds his view: because of single-phase power supply is there a difference in three-phase power supply, three-phase will happen in the motor rotating magnetic field, the principle of single-phase capacitor motor start is: using the capacitor current in the circuit exceeds 90 degrees, the startup winding is formed in a 90 degrees ahead of the main winding magnetic field, so there will be a mutually in the motor 90 degrees Angle of alternating magnetic field, popular says, is to use the principle of phase shift capacitor single-phase power into two phase power source are 90 degrees, a mutual in motor 90 - degree rotating magnetic field, a rotating magnetic field, the motor can rotate. The li electrician look more academic some explanation, professional knowledge is more, don't know who you think is more correct?

the internal structure of single-phase ac motor start capacitor in general can be divided into two winding up and running, start winding is commonly known as the auxiliary winding, winding is also called the primary winding, after know these knowledge, encounter similar & throughout; Buzz throughout the &; Noises without rotating two-phase ac motor's problem, will involuntarily want to check whether to start the capacitance of the problem.

the capacitance is to distinguish the size, is not optional to install a capacitor can make the motor running, too big, motor speed is too fast, long running will be fever, easy burning motor; Is too small, I'm afraid I can't form enough current magnetic field, to rotate the motor can not normal, so everyone in the replacement start capacitance, must according to the size of the original capacitance as standard, can not arbitrarily change the size of the oh

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