Model of elevator drive with jerk control

A strong jerk which can cause passengers discomfort occurs when electric elevator starts and stops. If uncontrolled, the jerk have influence on the electrical and mechanical subsystem performance and reduce the system life expectance. Modern drives have ability to control speed, so we can indirectly control the jerk. This paper describes the control of real gear-less electric elevator drive with vector-controlled induction motor. Position trajectory is determined by the need that jerk is changed by the predefined function. A mathematical model of the drive is presented, and it is tested through computer simulations.