A motor driving controller suitable for elevators

Abstract

An induction motor driving controller which can improve performance of elevators is studied. The controller has three features. First, it has an energy-saving control by which the induction motor stably generates motor torque at the maximum efficiency, regardless of the number of passengers boarding the car, even if both acceleration from a standstill and deceleration from steady state are done for any elevator. Second, it can suppress vertical vibrations of elevators while performing energysaving control. Third, it ensures good performance of elevators even when the source voltage is reduced due to an overload on the source sides.The controller is judged suitable for the drive system of elevators on the basis of simulations and experiments.

Implementation and performance analysis of an elevator electric motor drive system

“…Elevator induction motor ASDs usually either use the simpler lower-perfomance Volts/Hz control or the more complex higher-performance vector control [9].…”

Research on low-speed gearless permanent magnet synchronous motor for elevator drive

“…Variable-poles two-speed AC motor, VVVF controlled DC motor and disc-type PMSM drive system has presented tradition-breaking improvement compare with hydraulic system [3], [4]. Nonetheless, in electric drive system, the perfect performance of lower-speed gearless PMSM is incomparable.…”

Drive systems for high-speed gearless elevators

“…Usually, the vector-control method makes it impossible to save energy, which keeps the magnetizing current at the rated value regardless of the load. If the magnetizing current has been varied, it is possible that the motor torque generated in the motor cannot be controlled efficiently, quickly, and stably as it becomes a nonlinear function of the torque current [3]. The proposed system adopts not the induction motor but the permanent magnet motor.…”