How fast do flywheels spin?
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How fast do flywheels spin?
Modern flywheels use rotors made of composite materials that are capable of spinning at 100,000 rpm, or higher. Some also use massive metal rotors but the rotational speed of these is limited by their ability to resist the high centrifugal forces.
How fast can you spin a steel flywheel?
Flywheels are typically made of steel and rotate on conventional bearings; these are generally limited to a maximum revolution rate of a few thousand RPM. High energy density flywheels can be made of carbon fiber composites and employ magnetic bearings, enabling them to revolve at speeds up to 60,000 RPM (1 kHz).
What is the power required to run a flywheel at 2000 rpm?
The steady state power requirement to maintain the flywheel at 2000 rpm is zero. In principle, it take no power at all to keep a flywheel spinning forever. In practice, the power requirement will depend on how good your bearings are and how much air resistance the wheel is subject to. In addition it is overly optimistic to quote…
How does a flywheel starter motor start an engine?
The gear teeth cut into the flywheel’s circumference support starting the engine. In the engine’s starter motor, a small gear (called a Bendix gear) mates up to the flywheel when you turn the key. The Bendix gear/starter motor combination spins the flywheel, turning the crankshaft and beginning the compression cycle required to start the engine.
What is the kinetic energy of a flywheel?
For a flywheel to perform efficiently, it must store a certain amount of kinetic energy. Kinetic energy is a function of mass and speed. This kinetic energy is needed to simulate the smooth pedalling operation and give the feeling of a road like sensation while riding.
How much power does an electric motor need to run?
Most electric motors are designed to run at 50\% to 100\% of rated load. Maximum efficiency is usually near 75\% of rated load. Thus, a 10-horsepower (hp) motor has an acceptable load range of 5 to 10 hp; peak efficiency is at 7.5 hp. A motor ’s efficiency tends to decrease dramatically below about 50\% load.