Why is the rating of Motor written in KW instead of VA, KVA, MVA?

The motor is designed with a specific power factor. So its lead can be easily calculated. For this, the unit of power in the nameplate of the engine is w.

When significant, KW is written. Matter converts electrical power into mechanical power. And mechanical power is active power. What is written on the meter's nameplate is the meter's output, i.e., the mechanical power. This means that what is written on it is electrical power or mechanical power. That is why it is written in Kw.

Why is neutral used in single-phase motor, and why not three-phase neutral is used?

If you can answer the two questions separately, the benefit is lost. I'm just talking about single and three-phase induction motors. Otherwise, the answer will be much more significant. I assume you know the difference between line voltage and phase voltage. Who told you that the machine will not run if you supply line voltage in a single-phase induction meter? I swear. But the problem

The domestic supply voltage is 220-230 volts in almost all countries, so this type of equipment or single-phase meter is rated at 270-280 volts. But the domestic supply is usually given the phase voltage of Star End. If the line voltage is given, the effective voltage will be like 360 volts. Is it within the tolerance limit of your home fan? Now let's see why neutral is not used in a three-phase induction motor. This is explained quite a bit by the operating principle of the induction motor. Here a spatial difference is made because if only the time-variant turns the meter, it starts encircling the secondary part of the transformer. It is also essential to make this 120 mechanical variant.

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Why is the rating of TRANSFORMER written in VA, KVA, MVA?

Where would I connect if neutral? Still, let's connect, let's connect. What is the benefit? In a balanced three-phase system, the flow of electricity through the neutral is zero. So giving a neutral connection means wasting time and money. Now the question may come, if the supply system is biased, then it will transmit neutral current. Answer: In that case, an asymmetrical fault will be created in the supply line. The relay will stick. In addition, the meter will cut the protection system and supply.

Moreover, if there is no protection system though impossible situation, what will happen? Spatial harmonics will be created. You must have heard of cogging and crawling. Will be crawling. However, I can't say whether the fifth or seventh harmonics will be made; we have to calculate. Irrelevant but exciting to say, you know, a single-phase induction motor does not exist. With the capacitor, we make an auxiliary winding, with the primary winding phase difference being 90 law according to the nature of the capacitor. Then whether two phases are created. It never occurred to me that these two phases could be so easily made with the help of a capacitor if given a line voltage. I think the problem will be created here too.