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Author Topic: Opening a window on self running motors  (Read 89 times)
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img  mbrownn
Opening a window on self running motors « on: 2012-06-11, 02:52:04 »
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Posts: 246
This is just a thought experiment that I put in the simulator.

http://www.falstad.com/circuit/#%24+1+5.0E-6+72.29451344610798+50+5.0+50%0AT+640+288+672+320+0+0.0010+4.0+4.544567214199786+0.006485951713148764+0.999%0At+448+272+496+272+0+-1+25.2110755466085+-3.1800695410311164E-8+100.0%0At+448+336+496+336+0+1+-25.207162391647742+3.157779001673671E-8+100.0%0Aw+496+288+576+288+0%0Aw+528+320+576+320+0%0Aw+496+352+496+400+0%0Aw+720+400+848+400+0%0Aw+496+256+496+208+0%0Aw+496+208+784+208+0%0Aw+496+208+448+208+0%0Ar+448+208+448+272+0+212000.0%0Ar+448+336+448+400+0+212000.0%0Aw+448+400+496+400+0%0Ar+448+272+384+272+0+400.0%0At+320+288+384+288+0+1+-25.29149291299738+-0.9280836487289924+100.0%0Aw+384+304+384+336+0%0Aw+384+336+448+336+0%0Aw+384+336+320+336+0%0Ad+320+336+320+288+1+1.1%0Aw+320+160+672+160+0%0Aw+672+160+672+288+0%0Aw+672+320+672+448+0%0Aw+672+448+320+448+0%0Av+912+400+912+208+0+0+40.0+24.0+0.0+0.0+0.5%0Ac+496+256+496+288+0+1.0000000000000001E-7+25.211075578409197%0Aw+576+288+576+240+0%0Aw+576+320+576+368+0%0Aw+576+368+752+368+0%0Aw+576+240+752+240+0%0Aw+752+240+752+272+0%0Aw+784+208+784+304+0%0Ad+720+304+752+336+1+0.805904783%0Ad+752+336+784+304+1+0.805904783%0Ad+720+304+752+272+1+0.805904783%0Ad+752+272+784+304+1+0.805904783%0Aw+752+336+752+368+0%0Aw+720+400+496+400+0%0Aw+720+304+720+400+0%0Al+576+320+640+320+0+0.04+-4.544567214199786%0Ar+576+288+608+288+0+0.25%0Aw+320+336+320+448+0%0A181+320+288+320+160+0+1975.8074195154888+0.01+2.0+0.0040+0.0040%0Ap+496+288+496+320+0%0Av+640+288+608+288+0+0+40.0+6.0+0.0+0.0+0.5%0Av+592+336+624+336+0+0+100.0+28.8+0.0+0.0+0.5%0Aw+624+336+624+480+0%0Aw+592+336+592+496+0%0Ac+848+208+848+400+0+0.01+24.36340932768687%0Ad+912+208+848+208+1+0.805904783%0As+848+400+912+400+0+0+false%0Aw+784+208+816+208+0%0Aw+848+208+816+208+0%0Aw+816+208+816+480+0%0Aw+848+496+848+400+0%0Ar+592+496+848+496+0+3.0%0Ad+624+480+816+480+1+0.805904783%0Aw+496+320+528+320+0%0Aw+496+512+496+400+0%0As+496+512+528+512+0+1+true%0Aw+528+320+528+512+0%0Aw+624+272+816+112+0%0Aw+592+272+816+48+0%0Aw+608+336+912+464+0%0Aw+608+320+912+432+0%0Ax+825+45+1054+49+0+16+Motor+and+transformer+resistance%0Ax+841+113+1086+117+0+16+BEMF+in+Motor+loaded+at+maximum%0Ax+930+433+1108+437+0+16+12v+100w+3000rpm+Motor%0Ax+932+464+1156+468+0+16+24v+50w+3000rpm+DC+generator%0Ax+188+622+378+628+0+24+24v+battery+power%0Ax+548+621+725+627+0+24+generator+Power%0Ax+903+616+1036+622+0+24+motor+power%0Ax+443+539+568+545+0+24+Start+switch%0Ao+23+64+1+291+7.62939453125E-5+9.765625E-5+0+-1%0Ao+44+64+1+291+80.0+9.765625E-5+1+-1%0Ao+38+64+1+35+640.0+9.765625E-5+2+-1%0A

I put John Bedi (oops not allowed to say that) Fettuccini's window motor in the simulator and wondered why no one has ever bothered to add a generator to it. The problem has always been you need to match the generator to the load, so I replaced the window motor with a transformer and added a 12v 100w motor and a 24v 50w generator

The bulb is there to add a resistance and indicate when the circuit is oscillating. The small capacitor across the transistor may not be needed.

The motor is running at about 58w with the generator giving around 30w, of course we have no iron losses in this but provided the motor/generator combination is around 60% efficient or above it should work.

To increase power lower the resistance of the 400 ohm resistor.
   
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