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Author Topic: The weed wacker bit the dust or did it?  (Read 1925 times)

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Norm

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The weed wacker bit the dust or did it?
« on: July 18, 2009, 01:24:50 AM »
 Remember.....

http://www.fieldlines.com/story/2009/5/28/3259/88832

???

Well like I said it made the inverter kick out so

finally I take it apart and yeah it's a PM motor

it's big enough for a regular 18 inch cordless

I figure it must have a diode in the handle

somewhere....I checked it out and when I press the

trigger I get 120 volts AC?? and PM s don't run on that.....would this be a 110 volt DC motor??


If it is...I can put about 90volts NiCad pack to

run it???

« Last Edit: July 18, 2009, 01:24:50 AM by (unknown) »
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wdyasq

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damn scoop
« Reply #1 on: July 18, 2009, 07:12:00 AM »
Many small motors are 'Universal AC/DC Motors'. These will run on either AC or DC power.


Ron

« Last Edit: July 18, 2009, 07:12:00 AM by wdyasq »
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wooferhound

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The weed wacker bit the dust or did it?
« Reply #2 on: July 18, 2009, 07:21:50 AM »
I had a weedwhacker that quit on me, so I took it apart and found a DC motor and a bridge rectifier. Turns out that the bridge rectifier was bad so I dug one out of my parts stash and went back to whacking many more weeds. A year later the trigger switch went bad so I just bypassed it, so now it starts as soon as I plug it up to power, this can be exciting at times.


But I am forever thinking about that DC motor, it could be up in the wind making an insignificant amount of power . . .

« Last Edit: July 18, 2009, 07:21:50 AM by wooferhound »
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Norm

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Re: The weed wacker bit the dust or did it?
« Reply #3 on: July 18, 2009, 07:40:42 AM »
This is definitly a PM motor, no field coils,

a slight 'cogging'.. will not run on AC, found a

little square gizmo ....NS64 with a tiny heat

bubble that don't look like it should be there??

 I can spin the motor with my fingers and get a

couple three    open volts...and about 50 volts

DC from the Ol pedgen spins it pretty fast.
« Last Edit: July 18, 2009, 07:40:42 AM by Norm »
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spinningmagnets

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Re: The weed wacker bit the dust or did it?
« Reply #4 on: July 18, 2009, 07:42:55 AM »
"..But I am forever thinking about that [electric weedwacker] DC motor, it could be up in the wind making an insignificant amount of power . . .


Perhaps in a revolutionary new type of VAWT? (Isn't "VAWT" Latin for "yard art"?)

« Last Edit: July 18, 2009, 07:42:55 AM by spinningmagnets »
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ghurd

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Re: The weed wacker bit the dust or did it?
« Reply #5 on: July 18, 2009, 07:48:22 AM »
Look something like a bridge rectifier on an ECM,

but smaller?

G-
« Last Edit: July 18, 2009, 07:48:22 AM by ghurd »
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Norm

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Re: The weed wacker bit the dust or did it?
« Reply #6 on: July 18, 2009, 07:58:34 AM »
A year later the trigger switch went bad so I just bypassed it, so now it starts as soon as I plug it up to power, this can be exciting at times.


Yep Exciting is the key word here, especially if

....like a co-worker running a weed wacker in

casual attire,  (open-toed sandals and shorts)

'Boy that smarts!....I didn't realize'

....some people


Like Tom quotes....'light travels faster than

sound ????

« Last Edit: July 18, 2009, 07:58:34 AM by Norm »
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Norm

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Re: The weed wacker bit the dust or did it?
« Reply #7 on: July 18, 2009, 08:04:00 AM »
No, more like a square diode a wire on each end,

just in series to the load.
« Last Edit: July 18, 2009, 08:04:00 AM by Norm »
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Norm

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Re: The weed wacker bit the dust or did it?
« Reply #8 on: July 19, 2009, 07:45:34 PM »
Mine does about 8volts (open) at 500rpm.
« Last Edit: July 19, 2009, 07:45:34 PM by Norm »
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