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Engineering
Mechanical Engineering
Is a Larger DC Motor Needed for Low Wind Speed Power Generation?
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[QUOTE="Baluncore, post: 6838765, member: 447632"] A propeller is twisted along its length, so when it is running and the plane is flying, the angle of attack will be productive over the full length of the blades. Another reason why starting is hard is that, when you want to start in a fixed wind, only a small length of the blades near the hub is near a reasonable angle of attack. Only once the propeller is spinning, can more of the blade length can be productive. The best and most expensive propeller blades have an asymmetric airfoil profile. That is more efficient than a symmetrical section blade. Unfortunately, you are building a turbine to be driven by the wind, not a propeller to drive the wind. The asymmetric section of an optimum propeller is the opposite of an optimum turbine, so a propeller does not make the best turbine. It will do for your application, but avoid expensive asymmetric section propellers. That is called cogging. [URL]https://en.wikipedia.org/wiki/Cogging_torque[/URL] The more magnetic poles your motor has, the easier it will be to start. More powerful simple motors have stronger magnetic fields and require more starting torque. For your experimental application, you might consider another identical motor on the same shaft, with phase adjusted to cancel the starting torques. The DC voltage generated by the motors will vary over the cycle, so one could remain disconnected, or you might get away with connecting them together in parallel. But that is an experiment that can wait until the turbine starts reliably. [/QUOTE]
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Is a Larger DC Motor Needed for Low Wind Speed Power Generation?
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