Tape Drive Motor Data

[TomW]

I bought a pair of 30 volt Ametek Tape Drive Motors [TDM] from Silicon Salvage in California. $20 each, plus shipping, of course.

Shortly after I got them I ran output tests on one and built a quickie mill with the other.

I chucked the motor into my drill press and ran it thru a stud mount diode to 220 AH of 12 volt batteries that were at 12.9 volts.

RPM   Open Volts   Amps      Watts into 12.9 volts

210.        9.8V     0           0W
     
305.       13.5V     <1A       <12W
     
450.       18.2V     1.0A       13W
     
530.       24.6V     2.2A       28.4W
     
900.       41.0V     3.6A       46.4W
     
     

I didn't test above 900 RPM.

These are nice, compact motors with a 5/8" shaft and are sealed and have extremely nice bearings in them.

add a tail boom a tail a prop and a diode and you have a mill capable of  up to 40  watts at attainable rpm.

Cheers.

TomW

[wiredup]

hi tom i have removed the stock magnets and replaced them with 4 #29s nearly doubled yhe volts have you ever done anything like that.if so would you post results. thanks

[TomW]

However, We have discussed this over on IRC more than once. I am just better off putting together off the shelf parts to do non standard things than mechanically modifying things.

I believe JimU is going to do it one of these days.

Did you realise the #29 is no longer available?

Cheers.

TomW

[wiredup]

hi tom didnt know about the #29s glade i got 10 extra. there is no mods needed, they go right in where the old ones come outi didnt even glue mine down they held so tight and matched the curve so well. i may try the 50 volt next. have fun and thanks for all the info. P.S. those cup you have on things you keep.well they look a little to full to be catchin any wind, haha.

[TomW]

What you meant by:

P.S. those cup you have on things you keep.well they look a little to full to be catchin any wind, haha.

But i am a bit thick today with a flu virus or ??

Cheers.

TomW

[wiredup]

do you think these would make good rotor cups

[TomW]

Hah told you i was thick that day.

hmm not normal for a man to forget something like that but I have a lot of stuff out there and I am a bit of an absent minded professor type at times.

Cheers.

TomW

[TomW]

Got my 40 volt TDMs in yesterday. Chucked one in the drillpress for some tests. Here are the results:

Nominal 12 volt charging into 440 AH of batteries @12.1 volts

RPM   Open Volts   Amps into 12.1V    Watts

 210.        7.5V     0           0W

 305.       11.4V     0A          0W

 450.         16V     1A         ~12W

 530.         22V     3.1A       ~37W

 900.         28V     5.2A       ~63W

Nominal 6 volt charging into 220 AH of batteries @6.05 volts

RPM   Open Volts   Amps into 6.05V    Watts

 210.        7.5V     .25A           1.5W

 305.       11.4V    1.25A           7.5W

 450.         16V       3A           ~18W

 530.         22V     5.4A           ~32W

 900.         28V       7A           ~42W

Well these numbers are quite interesting. I expected higher voltages at lower rpm but that was not the case.

What appears to be the case is it produces better current lower in the range and actually outperforms the 30 volt motors for 6 volt charging and has a better top end performance curve. It looks to be producing 25% more than the 30 volt motor @ 900 rpm!

Cheers.

TomW