Porsche pure electric flywheel energy storage

Why is a Porsche flywheel more durable than a lithium-ion battery?

Porsche viewed flywheel storage as more durable than lithium-ion batteries in the extreme power charge/discharge cycles of racing. Unlike a battery, the flywheel motor was capable of being fully charged (accelerated to its maximum speed) and discharged (decelerated to a near stop) multiple times a minute without adverse effects.

What is a flywheel energy storage system?

First-generation flywheel energy-storage systems use a large steel flywheel rotating on mechanical bearings. Newer systems use carbon-fiber composite rotors that have a higher tensile strength than steel and can store much more energy for the same mass. To reduce friction, magnetic bearings are sometimes used instead of mechanical bearings.

Can a high-speed flywheel energy storage system utilise the fess useable capacity?

This can be achieved by high power-density storage, such as a high-speed Flywheel Energy Storage System (FESS). It is shown that a variable-mass flywheel can effectively utilise the FESS useable capacity in most transients close to optimal. Novel variable capacities FESS is proposed by introducing Dual-Inertia FESS (DIFESS) for EVs.

Does Beacon Power have a flywheel energy storage system?

In 2010, Beacon Power began testing of their Smart Energy 25 (Gen 4) flywheel energy storage system at a wind farm in Tehachapi, California. The system was part of a wind power/flywheel demonstration project being carried out for the California Energy Commission.

How does a flywheel transfer kinetic energy back into electrical energy?

To transfer the kinetic energy stored in the flywheel back into electrical energy, the rotating magnetic field generates a current in the reverse direction (by inverting the polarity of the applied voltage), and power is delivered to the same motor/generators that harvested energy during the original braking event.

Is the Gyrodrive flywheel a good choice for a bus?

The system, and subsequent variations, have seen use in buses from UK manufacturer Alexander Dennis in both single and double-decker bus models. However, the Gyrodrive flywheel system was considered too large and expensive for urban-use cars (taxis), which adopted various battery strategies.