Modeling of DC Elevator Motor Drive forMid-rise Building

Abstract

An elevator is a platform, either open or enclosed, used for lifting people orfreight to upper floors within a building. Elevators are a standard part of any tallcommercial or residential building. Mid speed elevators are commonly used invarious mid-rise buildings today.In this paper, a new type of gear traction machine drive system with apermanent-magnet (PM) DC motor for mid-rise and mid-speed elevators ispresented. This application of PM motor to the elevator traction machine enablesseveral improvements including higher efficiency, greater ride comfort, andminiaturization and so on.The ideal elevator drive at larger horsepower levels should have efficientpower conversion, regeneration, low harmonic distortion, and near unity powerfactor at the utility power lines. Therefore, voltage-fed 3-phase PWM rectifier isadopted so that DC bus voltage regulation, bi-directional power flow andcontrollable power factor with reduced input current harmonics are possible.