Make your Home Green

Is there a linear relationship between rotations going into a DC generator and voltage coming out?

I’m building a small vertical axis wind turbine for a school project. I wasn’t getting the voltage I needed with wind from the fan I had, so I decreased the radius to increase the rotational velocity. When I halved the radius (and doubled the RPMs), the voltage more than quadrupled. Is this an accurate relationship? Or should the relationship be linear and some other factor accounts for the increase in voltage?

Generators are usually wound to be linear over their usual operating range. When running slower than that the voltage will increase with speed but with no guarantee of linearity.

Ropatec vertical axis wind turbines

Savonius Model Wind Turbine Plus $59.95 PicoTurbine’s Savonius Model Wind Turbine Plus kit is a fully function miniature vertical windmill. At wind speeds of 12 mph it produces approximately 3.0V/50mA. The frame is built from high quality craft wood and coated with premium enamel to help protect it from the elements. The kit comes with 4 ceramic grade-five magnets and 4 (220)-turn copper coils. This hobbyist’s kit walks users through ev…

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GudCraft 10W 15W Max Vertical Wind Turbine Wind Generator $199.00 Features: Every turbine is finely balanced. Smooth rotation is ensured Quiet in operation Unique and purpose designed generator The turbine spinning when other wind generators stall Overall delivers more Ampere hours of power per day especially in low to average wind speed. This is a smallest version of vertical wind generator, can be around the home, farm, boat, business, or anywhere else where…