Wave processes in coils of electric motors for gearless elevator drives

Abstract

Provision of reliability to coils of electric motors for gearless elevator drives is considered. The results of studying wave processes in electric motors for gearless elevator drives are presented. One of the basic components of electromechanical elevator drives is an electric motor with adjustable frequency of rotation and an automatic speed control unit (frequency converter) of corresponding power. In the last quarter of the 20th century, these drives replaced traditional drive units with a two-speed induction motor (AC2), which was prompted by the wide use of microelectronic innovations. As indicated by the best operating practices and Russian and foreign research literature, the most promising units for use as electromechanical energy converters in elevator electric drives are high-torque induction motors with a square-cage rotor and synchronous motors with permanent magnets (VVVF). A persistent opinion has taken root that using these systems of elevator control will make it possible to save twice as much energy in comparison with traditional drives with a gear unit and a traction sheave.