I've seen speed/torque curves for motors that have torque on the x-axis and others that have it on the y-axis. Does anybody know of any reasons why people do this one way or the other? Or is it just personal preference. The only thing I can think of is if you go by the convention of putting...
Let's say I have a print with +/- 0.003" tolerance on a dimension. Typically with 3 significant digits, one would round numbers like 0.0034 down to 0.003. My question is should a +/- 0.003" tolerance be interpreted as +/- 0.0034" due to significant digit rounding?
On an AC induction motor, if the rotor and stator aren't aligned (that is, the rotor is shifted axially with respect to the stator), when the motor is turned on, will there be an axial force on the rotor? In other words, will the stator and rotor try to align themselves once power is applied?
I have a part that's been in production for a few years. Its made out of a 35% glass filled Zytel. The mold tooling is aluminum. The last shipment of parts we got in were fine and now there is one feature on our part that is out of tolerance (by about 0.003" on a .750" diameter bore) on the...
Can you use a rheostat to control the speed on a single phase(PSC), fractional horsepower motor? If so, how does it control speed without changing the frequency?
Is there any industry standard on the tolerance of magnetic properties for rare earth magnets? Looking in the MMPA 0100-00 standard, I didn't see any mention of it. Generally, energy product is given as a maximum but are Br, Hc, and Hci given as nominal values?
Does anybody know of any standards for specifying maximum leakage current during end of line hipot tests? This would be for low voltage motors (460V or less). UL 1004 specifies a hi-pot voltage but not the leakage current. Perhaps there is an IEEE standard?
I've got a print from a German company. On the print is a hole with 2 tolerances called out on it. The one tolerance has the words "nach dem giessen" in parentheses after it and the other tolerance has the words "nach dem räumen" in parentheses after it. I think it is the tolerance before and...
An exponential decay ( y = C*e^(B*x) ) is straightforward to fit by taking the LN(y) and using LINEST in Excel. But does anybody have a good way to fit the equation y = A - C*e^(B*x), where x and y are data points and A, B, and C are all unknown?
Hi,
Lets say I have two disc magnets of equal size that are stuck together with zero air gap. Are there any analytic methods for determining the shear force required to separate the two magnets? I've found formulas for determining the normal force required to separate the magnets, but not the...
