How to Calculate Motor No Load Current?

Duplicate thread. This has been covered before.

Yes, it has and by this OP. So I guess the answer to the question is even when the OP is shown the homework, the OP cannot calculate the "no load" current.

You are now acting like a student trying to get help with homework. I asked in the previous thread why you thought you needed to know, you did not respond. Now it also appears you did not even read the answers in the previous thread. So you are either a student who knows that if you speak the truth and admit you are trying to get us to do your work for you, you will be banned, or you are simply a troll. Begone with you then!

Agreed, but there is a myth here that was only obliquely addressed in the other thread. Unless there is a prime mover overcoming all ancillary bearing drag, wind, etc. there is no such thing as "no load".

It's time to place a "panic call" the the supplier of the motor and ask them to supply the data.

Roughly FLC/3, but it varies with motor type and design, and what one means precisely by "no load." I doubt that there is a standard formula.

Ask manufacturers and codes/standards(BS/IEC/NEC/NEMA/VDE etc) organisations why it is not included in motor name plate. It is not guess work.

There is no need to include this info on the nameplate.

It is not usefull and depends on the final installation etc.

you can do the test on site with the normal load removed.

As far as I know, there is no useful purpose for knowing this, so in allowing him to think there is, this information may be leading the OP completely astray in thinking that his motor is performing, or not performing, as expected.

Put a tachometer on it. When it is running at full speed unloaded, cut the power. Record how quickly it slows down (rad/sec^2). Multiply by the moment of inertia to get the no load torque. Torque x speed gives output power. Divide by efficiency to get input power. Divide by voltage to get current.

What? Maybe you meant.... but.... What about the phase angle between... Never mind.

Simply use a clamp-on meter & measure the no load current

Correct but this is a fictitious motor in a homework question. No motor - no cables and no tong.

Ask yourself why anyone would be running the motor without a mechanical load on it.

For the purpose of measuring no-load current and pf,running at no-load should be allowed. After rewinding a motor by measuring no-load current you can compare the results with the original reading you took earlier or provided in the manufacturer's literature.