Annual Report 2009 - Von Roll

Glossary 101Quality assuranceIn today’s industrial companies, the quality of manufacturedproducts is guaranteed through quality assurancesystems and periodically checked using ISO certification(e.g. ISO 9001).Rotational energyRotational energy is the kinetic energy of a rigid bodysuch as a wind turbine rotating on a fixed axis. This energydepends on the body’s moment of inertia and angularvelocity. Wind turbine generators use rotationalenergy to produce electrical current in the stator coilsthrough electromagnetic induction.StatorA stator is the stationary part of a machine, e. g. in anelectric motor, generator, hydromotor or pump. It oftenalso serves as the housing, and in the case of electricmotors and generators consists primarily of sheet steeland the stator coils.Surface resistanceThe voltage required to cause a specific current to flowacross the surface of a material. This is an importantparameter for the surface leakage resistance and antistaticproperties of materials used to make printed circuits(soldering and assembly frames).Traction motorA traction motor is an electric motor that drives a vehiclethat runs on rails. It is usually housed in the chassisand connected to the wheel axle via a reduction gear.Underwriters Laboratories (UL)US organisation, founded over 100 years ago, that inspectsand certifies products for their usage propertiesand safety.VoltUnit of electromotive force named after the Italian physicistAlessandro Volta (1745 – 1827), the inventor of thebattery.XenonA chemical element and noble gas used in gas dischargelamps, for example in car headlights.YttriumA chemical element and rare-earth metal. It plays an importantrole in ceramic high-temperature superconductors.