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Forum Index : Windmills : My new addition
| Author | Message | ||||
| brucedownunder2 Guru  Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Hi Crew,, I've finally finished making a test bed for testing different re-wires of Stators and running up Neo Rotors .. I'll make an adaptor to fit the Seeley motor also -- With the gearbox (old floor polished) and 1.5 hp motor ,I get 400 rpm ..This can be changed by different pulleys .. Runs smooth ,just the normal gearbox noise.. 
Bushboy |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5116 |
Well done Bruce, very neat. Do you have any way of measuring your drive motor current and F&P RPM? With those figures you can make some very accurate measurements. Your workshop looks too clean! Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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imsmooth Senior Member  Joined: 07/02/2008 Location: United StatesPosts: 214 |
where did you get the gears/pulleys? Where did you get the braces to hold the white plastic to your table? How are you holding the gear to the shaft? It looks like you have screw. Did you drill a screw hole into the shaft? |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
IM,, the white plastic bearing holders were cut from the bowl of the F&P ,,drilled and tapped ,mounted onto Aluminium channel which is drilled and bolted to the Aluminium plate on the top of those 2 blocks of wood to give some clearence.. The pulley is bored on my lathe to tightly fit the shaft and a small seating hole was bored to accept the grub screw in the pulley. Lots of lathe work and scavenging of parts ... the gearbox was an industrial floor scrubber ,found discarded at the local tip.. The actual frame was an old saw table complete with rise and fall mechanism and a 1 HP 240v motor .. local tip shop ,,$20. Glenn,, could use a clamp meter and digital hand held rpm meter to do the above,,but Gordon has different ideas,,which I'll try to implement,as I get organized... Yeah,,workshop is still nice and clean,,,,and all my gear is cleaned and oiled after use.. Bruce Bruce Bushboy |
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| imsmooth Senior Member Joined: 07/02/2008 Location: United StatesPosts: 214 |
The rpm are easily measured with a flash strobe light. You can get them locally or on Ebay. Just put a white marker on the hub and you can track with the stobe flash. I measured my current with a clamp amp meter. |
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herbnz Senior Member Joined: 18/02/2007 Location: New ZealandPosts: 258 |
Hi Bruce Nice Work But as I have Mentioned a few times before rigid mounting of the stator in you design prevents the oportunity to measure the input torque and hence the input power directly as done in dynotesters. I will not harp on about it as I have mentioned many times before but notice the forum is not intersted. I have always used my lathe and supported the stator via the spring balence. Measuring the input current is so full inacuracies its usless Dr Chalko did but he likely had access to very accurate instruments. At present I have plans to build a separate tester to fre up my lathe plan is to use an old saw bench and hang FP unit off the shaft with a swinging arm to stop the rotor turning. Rpm is as said easier to measure digital tacho very cheap nowdays or I have old Mechanical one. Another thought if you do measure motor current dont forget this current from the AC is lagging voltage so PF must be allowed for this was the major confusion with the measurements given in the use of capacitor topic Herb |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Hi Herb,, never thought of the measurements you are talking about --This is just a "gadget" to run up some differently wired stators I have .. from some of the crude voltages I get ,I'll be able to guage which stators MIGHT be suitable for different rpm's.,,so therefore allowing me to make a rough judgement as to whether one is more suitable than an other for ,say, light winds.. It cost me $5 ... plus my time which is plenty and quite close to the frig,lol. Bruce Bushboy |
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| KiwiJohn Guru Joined: 01/12/2005 Location: New ZealandPosts: 691 |
Herb, Bruce, I suppose a jockey wheel to measure belt tension on the 'pull' side could be used to measure input torque? |
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| herbnz Senior Member Joined: 18/02/2007 Location: New ZealandPosts: 258 |
Hi Bruce Yea that seems to be the aim of other members to personally I want to know what is also happening to input else we start to get mislead like was going n on capacitor disscusion. actually looking you design If you replaced channel with two plumb bearings and attached arms to stop stators turning you would have it you attach spring balence to arms when measuring torque if not rest on table to take torque. sorry what cost two bearings I generaly use FP setup for my projects. John A idea but it would not be much work to do the above and more accurate. In fact if only one side is done only need one beraing Ok interesting goings on just off my beach they are sinking a ship to remove a giant oil rig. Herb |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Herb, is a "spring balance" accurate enough? I mean, if one goes to the trouble to measure input torque one might as well do it with the long lever & sliding weight method. Please remind me of the formula to convert Nm to input power? Its too long ago since I dealt with that stuff. Tinker Klaus |
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| herbnz Senior Member Joined: 18/02/2007 Location: New ZealandPosts: 258 |
Hi Tinker Accuracy comes to how much money you wish spend. Im at present doing a consulting job for testing crimp lugs to standards its a never nding question as to instruments technics being tracable to standards. In our case I personally quite happy with a basic spring balence but you could buy a standard verified one easier than i think you would find standard weights. It is not any trouble to measure input info gathered is very enlighterning testing neo magnets I would say wasting you time unless u see whats hapening to eff. formula 2* 3.142* * N * T /60 3.142 pi N RPM T Newton Metres Newton = 9.81 KG Metres the length of arm to centre shaft when measuring force centre shaft to attachment point must be close to right angle with balance. Herb |
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