Recent content by mnsman

I must have a fundamental misunderstanding of the formula W=Fd. I don't see anything about the output has to be meaningful as in the case of my example. Doesn't the spinning wheel, in this case, represent kinetic energy and that in itself is a result of work performed? In my real life case we...

It's late and I decided to drop by for some unknown reason so I haven't given this much thought. First of all I'd like to say that I appreciate people still tackling this question. My naive thinking is this... If I were a worker is paid by food (energy) to turn a wheel on a shaft and...

I will figure this out myself. Here is your clue as to how. What is work? Can anyone on this forum answer that question? Physics forum?

The 90k rpm figure was derived with a tachometer that reads directly from a hall sensor output. The hall gen senses the position of the rotor magnet and is used for timing the drive coil output. My rotor magnet is a diametrically magnetized ring magnet. Therefore there is one symmetrical...

Okay you got me on that one. Agreed it sets up the best case scenario but it is still not what I'm after since I know I don't have 100% efficiency. At least I know I can solve for best case. I thought mass may come into play here and it could help solve the problem. So in summary you say...

Thanks for your reply vk6kro. Yes that is an accurate rpm measurement. The rpm has varied and that is the maximum recorded. It was measured with a tachometer and oscilloscope connected directly to the hall sensor input of the circuit. The rpm was also closely confirmed by a spectrum...

Hello all, I have a few questions about calculating efficiency, torque and horsepower for a small pulse dc motor. The only parameters that I have are input voltage = 39Vdc, input current = 2A and rpm = 90,000 rpm. Are the above values obtainable with the given information? This is not a...