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birdhouse
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Joined: 27/01/2009
Location: United States
Posts: 63

Posted: 06:14am 05 Feb 2009

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hello all

i removed the brake from my three phase ac brushless servo motor. the three hot legs were very apparent one the cover was removed. now that it is back together i can't light a light bulb with any of the hot legs. i've been using a bare aluminum portion of the motor case as a ground and duct taping a drill to the motor shaft. i've tried using all sorts of bulbs, big, small, ac, dc. not even an orange filament. when i put my meter on one of the hots, i was able to clock 25 volts but no amps. i used a continuity meter and discovered that all three hots have continuity. this suprised me. it may be possible that i nicked one of the coils while trying the get the motor apart. if so, is there a resin or epoxy that could keep the coils from arcing? if this is even what is happening?

i'm so lost!

thanks

i pee more than once before flushing, and don't have to flush at all up at the ranch!

KiwiJohn
Guru

Joined: 01/12/2005
Location: New Zealand
Posts: 691

Posted: 07:41am 05 Feb 2009

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Maybe the ground is not connected to the windings?

Try your bulb test between two hot wires.

birdhouse
Regular Member

Joined: 27/01/2009
Location: United States
Posts: 63

Posted: 08:16am 05 Feb 2009

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KiwiJohn-

thanks! that was easy!
was able to get a 75 watt bulb pretty bright! at fairly low rpm, i think. using a drill that maxes at 2000 rpm. but the tape job is crooked now, so it can't be going that fast or it would rip off. and that is just two phases. i'm sooo stoked!

is this kinda like how you can run (NOT leagaly here in the states) 220v residential circuits using only two wires? i understood it as each wire has flow in both directions, hot towards the load, neutral back to the panel. the explanation is probably way off, but that is how i wrapped my head around it.

so i gues three phase ac is kinda like the above example, but an additional wire???

thanks again! happy camper over here.

i pee more than once before flushing, and don't have to flush at all up at the ranch!

Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5119

Posted: 09:08am 05 Feb 2009

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OK now your scaring me.

Be VERY CAREFULL. If you accidently make contact with those wires while the drill is turning the motor, it could kill you! Seriously.

Before you go any further, you need to do some research to get a basic understanding of what you are playing with. Dont take this the wrong way, but the level on knowledge you have now is dangerous. Playing around with this sort of stuff can kill or burn your house down unless you know what your doing. Its like playing around with a can of gas, a box of matches, and not knowing it.

So, google is your friend. Look up phrases like "basic electronics" "AC Power for beginners", thats sort of thing. Keep researching until you say to yourself "Hey what I was doing was a little dangerous!", and then your ready to go foward.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

birdhouse
Regular Member

Joined: 27/01/2009
Location: United States
Posts: 63

Posted: 03:47pm 05 Feb 2009

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gizmo-

thanks for the heads up! i am tthe first to admit i know little about 3 phase ac.

hopefully this makes it seem like i was taking some precautions- the drill is double insulated and plugged into a GFCI. the bulbs have soldered extension wires that are wire nutted to the hots from the motor. i am only touching the drill, and with only one hand.

could two of these wires, at low rpm, produce a worse shock than a 120vac 20amp circuit? i've lost track of how many times i've been shocked by those.

i will research, and use utmost care in the testing phase.

thanks!

i pee more than once before flushing, and don't have to flush at all up at the ranch!

DaViD

Senior Member

Joined: 14/01/2009
Location: United States
Posts: 120

Posted: 03:53pm 05 Feb 2009

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Under the right conditions less than one amp can kill a person so I have been told.

If your not living on the edge your taking up to much space!

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