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40 The following terms are used in this document. Term Definition ASME 17.1 American Society of Mechanical Engineers (ASME) Safety Code for Elevators and Escalators Capacitor A passive electric component used to store energy electrostatically; used to increase power factor by counteracting inductive loading from electric motors to make load appear mostly resistive Direct Drive A chainless drive connected directly to the shaft of a motor without use of a gearbox, chain, or belts; has increased efficiency because power is not wasted in friction Escalator A load carrying unit designed to transport a wide variety of people, along with their luggage, at airports; escalators are driven by an electric motor and a drive system, which moves steps or belts with coordinated handrails at synchronized speeds Fluorescent Lighting All fluorescent lamps and certain other types of light bulbs contain mercury, and fluorescent lamps are the most common type of indoor light source for commercial and public buildings (Department of Ecol- ogy, State of Washington) High-Efficiency Motor A motor with 1â10 percent higher efficiency than standard motors due to less internal loss in the motor due to power losses and magnetic core losses; contains more copper and iron, which lowers losses but increases cost Intermittent Drive Motor controllers that slow down an escalator to either a complete stop or a lower speed when passengers are not present LED Lighting A semiconductor diode that emits lights when a voltage is applied to it and that is used especially in electronic devices (Merriam-Webster Dictionary) Moving Walkway A load carrying unit designed to transport a wide variety of people, along with their luggage, at airports; moving walkways are driven by an electric motor and a drive system, that moves steps or belts with coordinated handrails at synchronized speeds Glossary
Glossary 41 Permanent Magnet Synchronous Motor (PMSM) A cross between an alternating current (AC) induction motor and a brushless direct current (DC) motor; the primary difference between a PMSM and an induction motor is that the rotor magnetic field is produced by the permanent magnets Regenerative Drive A motor drive that captures energy on down escalators and converts this energy to electricity; when passengers are being transported on a down escalator, the drive motor acts like a generator (similar to an asynchronous motor) and energy is produced; the regenerative drive controls the escalator load under all conditions and sheds excess energy by converting the energy into electricity and injecting it safely back into the supply network for use in building lighting or other applications Return on Investment (ROI) Profit from an activity for a period compared with the amount invested in it Simple Payback The amount of time it will take to recover the initial investment, divid- ing initial design, purchase, and installation cost by the annual cost savings; does not factor in the time value of money Variable Voltageâ Variable Frequency Drive (VVVF) A motor controller that controls the voltage and frequency delivered to a motor, directly affecting the energy consumption of the motor
