Designing a Better Half-motor
Is there an equation for designing an efficient half-motor (single coil with 1/2 exposed coil leads that connect to the axle-stands/terminals), specifically interested in relating the gauge of the magnet wire, distance between coils, number of coils, diameter of the coil, distance from axis to magnet, size of magnet (or flux, but I'm not sure that flux would be helpful to someone trying to buy an appropriate magnet, so would need that info), voltage, and amperage of the DC terminals. The reason I ask is that my daughter and I put together a half-motor this evening and noticed that with greater voltage and amperage, it didn't go faster, but we could tap the terminal (on/off) to reduce the power and it went faster. So, I imagine there may be a practical way to determine this. If you need constraints, we are using 24 gauge magnet wire and about 2/3 inch diameter coil of maybe 25 loops with almost no distance in-between each coil, and roughly 1 1/4 inch from the axis to the 2 in x 7/8 " by 3/8 in ceramic magnet. It seems to be designed for a D battery.
Is there an equation for designing an efficient half-motor (single coil with 1/2 exposed coil leads that connect to the axle-stands/terminals), specifically interested in relating the gauge of the magnet wire, distance between coils, number of coils, diameter of the coil, distance from axis to magnet, size of magnet (or flux, but I'm not sure that flux would be helpful to someone trying to buy an appropriate magnet, so would need that info), voltage, and amperage of the DC terminals. The reason I ask is that my daughter and I put together a half-motor this evening and noticed that with greater voltage and amperage, it didn't go faster, but we could tap the terminal (on/off) to reduce the power and it went faster. So, I imagine there may be a practical way to determine this. If you need constraints, we are using 24 gauge magnet wire and about 2/3 inch diameter coil of maybe 25 loops with almost no distance in-between each coil, and roughly 1 1/4 inch from the axis to the 2 in x 7/8 " by 3/8 in ceramic magnet. It seems to be designed for a D battery.
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