israelkk,
The maximum temperature allowed seems to be misleading on the specification sheets. One motor gives the maximum coil temperature as 125 degrees celcius. Then they give a thermal resistance value of 13 degrees celcius per watt. If I still require 100 watts then this would be 13 *...
israelkk,
Thank you for your reply.
I am not sure if you misunderstood the duty cycle of the instrument but it is for a total of 5 cycles - 1 minute on and then 1 minute off - for a total of 5 minutes of operation.
I took your advice and spoke to the surgeon. He told me that the profile of...
Hi Blacksea,
Thank you for your reply!
I have looked into using a Maxon motor but they don't seem to have the an EC16 or EC22 motor with a power rating that fits my reqquirements. I did the following rough power calculations that do not include losses:
5 ozf-in = .026 lbf-ft
(45,000rpm *...
I am in the process of designing a high speed rotary surgical hand-piece (drill). The hand-piece must be a DC motor (brushed or brushless). The specifications of the hand-piece are as follows:
1)0 - 45,000 rpm (variable speed)
2) ozf-in torque through-out entire speed range
3)battery source to...
Thank you all for your replies!
The purpose of the test was to see what has been causing a low grinding sort of noise when the pump is operating at 3550 rpm. We mounted the accelerometer on the spindle bearing and plotted the peak vibration spectrum. Nothing looked out of the ordinary except...
I have a velocity/CPM peak vibration spectrum plot of an Aurora fire pump with 6 impellers. The pump operates at 3550rpm and weighs 2275lbs.
How can I determine the natural frequency from the spectrum plot? It shows consistent spikes at 2X,3X,4X,5X and 6X(BPF) and there is a high spike at...
