Kinetic Traction Systems is a business founded in November 2010, producing

Flywheel A flywheel is a mechanical device which uses the conservation of angular momentum to store rotational energy; a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assu ...

energy storage systems for electric railways and

grid storage Grid energy storage (also called large-scale energy storage) is a collection of methods used for energy storage on a large scale within an electrical power grid. Electrical energy is stored during times when electricity is plentiful and inexp ...

Technology

Kinetic Traction Systems' main product uses

flywheel energy storage Flywheel energy storage (FES) works by accelerating a rotor (flywheel) to a very high speed and maintaining the energy in the system as rotational energy. When energy is extracted from the system, the flywheel's rotational speed is reduced as a c ...

technology developed by Pentadyne Power Corp; staff from Pentadyne joined Kinetic. The 36000

RPM Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or with the notation min−1) is a unit of rotational speed or rotational frequency for rotating machines. Standards ISO 80000-3:2019 defines a unit of rotation as the dimension ...

flywheels are originally based on

uranium centrifuge A gas centrifuge is a device that performs isotope separation of gases. A centrifuge relies on the principles of centrifugal force accelerating molecules so that particles of different masses are physically separated in a gradient along the radiu ...

technology developed by

Urenco The Urenco Group is a British-German-Dutch nuclear fuel consortium operating several uranium enrichment plants in Germany, the Netherlands, United States, and United Kingdom. It supplies nuclear power stations in about 15 countries, and stat ...

KTS' rail-side device uses a brushless DC motor/generator to spin up the flywheel to store electrical energy (for instance, from

regenerative braking Regenerative braking is an energy recovery mechanism that slows down a moving vehicle or object by converting its kinetic energy into a form that can be either used immediately or stored until needed. In this mechanism, the electric traction m ...

on trains) as kinetic energy; later to be converted back to electrical energy on demand.

Uses

This system allows significant energy-efficiency improvements in urban rail systems; it has been used by NYC Transit and the

London Underground The London Underground (also known simply as the Underground or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in England. The U ...

. Their grid storage system helps stabilise the microgrid on the island of

Eigg Eigg (; gd, Eige; sco, Eigg) is one of the Small Isles in the Scottish Inner Hebrides. It lies to the south of the Isle of Skye and to the north of the Ardnamurchan peninsula. Eigg is long from north to south, and east to west. With an ar ...

Capacity

Usable stored energy is approximately . The devices can provide bursts of .

References

{{reflist, 30em Companies based in California American companies established in 2010 Electric rail transport Flywheels 2010 establishments in California