Development of a high-speed elevator controlled by current source inverter system with sinusoidal input and output

Abstract

An inverter elevator (2.5-4 m/s rated speed) which is controlled by a current source inverter system with sinusoidal input and output is developed. In comparison with a conventional DC elevator controlled by the thyristor Leonard system, it has the following features: (1) a reduction of higher harmonic currents to less than 5%; (2) more than a 30% reduction of power source capacity; (3) more than a 10% reduction of energy consumption, and (4) a 40% reduction of traction machine weight. The sinusoidal pulsewidth modulation control of the converter and inverter, performed by one-chip microprocessors, is described along with a detection and protection system for abnormal overvoltage. A general description of the elevator's performance is given.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>