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Author Topic: Why do more magnets on a rotor draw less current ?  (Read 2810 times)

Offline DeepCut

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Why do more magnets on a rotor draw less current ?
« on: June 07, 2011, 12:26:05 AM »
I was experimenting this evening, i had a rotor disc with magnets attached and a bifilar drive coil using the Bedini circuit to repel the magnets.

With 8 magnets the rotor was drawing around 300 mA.

I doubled the magnets to 16 and the rotor was drawing around 200 mA.

I would have thought that more magnets meant more 'on' time thus drawing more current ?

Is it because more magnets results in faster RPM so each pulse is then shorter ?

If that's the case then what's the critical threshold of the tradeoff between additional magnets (and the resulting additional rotor mass) and decreasing current draw ?

Unfortunately i don't have enough of these magnets to experiment further.


Any advice greatly appreciated,

Gary.

Offline Low-Q

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Re: Why do more magnets on a rotor draw less current ?
« Reply #1 on: June 07, 2011, 07:39:13 PM »
Probably because the motor is more efficient with more magnets. The higher rpm will also provide more "juce" to feed back to the supply. Remember, that this motor is also a generator. The higher rpm, higher efficiency, the more power it delivers back - resulting in less ampére from the power supply.

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