Rotary energy storage mechanism

2018-04-16 14:33:55

With a normal spring, you compress it using a linear force to store energy and then it decompresses and releases the energy, again in a form of linear force. Is there a mechanical mechanism that stores energy by rotating force and releases energy by rotating force? It doesn't have to be spring operated, but I think it's the only way to work, with springs.

I want it to work for many many rotations (to store energy) and to produce many many rotations! what's the best mechanism for this?

Both a torsion bar and a "coil" spring do what you want. The torsion bar is intended for rotation of only a fraction of a circle, and generally has a high spring constant. The coil spring can be designed for a number of rotations, generally with a lower spring constant.

Look at any old windup watch or clock and most likely the energy storage mechanism is a coil spring. Some old clocks are powered by dropping weights, but these are usually not "wound" to add the energy.

The

  • Both a torsion bar and a "coil" spring do what you want. The torsion bar is intended for rotation of only a fraction of a circle, and generally has a high spring constant. The coil spring can be designed for a number of rotations, generally with a lower spring constant.

    Look at any old windup watch or clock and most likely the energy storage mechanism is a coil spring. Some old clocks are powered by dropping weights, but these are usually not "wound" to add the energy.

    2018-04-16 15:00:01
  • The mainsprings of mechanical timepieces provide an excellent example of how you can accomplish what you want. They are a type of torsion spring made from a metal ribbon which can typically be wound 6 or 7 full turns. The images below show what some of these look like when unwound and wound.

    2018-04-16 15:03:06
  • For "many many rotations", a pneumatic motor can act as both a compressor and motor. Spinning the motor causes air to be forced through a tube, one-way valve, and storage tank. Opening the valve allows the compressed air in the tank (potential energy) to flow back through the tube and motor, spinning it in reverse. As the number of rotations increases, the pressure increases, acting to stop the axle for a given torque. This presents a rotational limit, based on the volume of compressed gas, size of motor, size of tank, etc. For fast rotary motion this could work, but for slow motion, the pneumatic motor may "leak" and store little or no energy.

    For "many many many rotations", a permanent magnet motor/generator -> DC rectifier -> battery (or supercapacitor) may work to store considerably more energy. Similar to the pneumatic concept, slow motion will not produce much charge. But the density of stored potential energy is much higher in batteries than it is air tanks.

    There are signif

    2018-04-16 15:24:25
  • A spring loaded piston actuating a rack, and turning a pinion gear. Smaller the pinion gear, relative to the length of the rack... the more rotations achieved in a given stroke. And also the greater the piston pressure required...

    2018-04-16 15:37:04
  • why hasn't anyone made as car with a wind up motor?

    2018-04-16 15:38:40