3JANOVSKY L. Elevat or Mechanical Design [M] . New York : EllisHor wood, 1993.
4CHO Y.M, RAJAMANI R. Identification and experimen- tal validation of a scalable elevator vertical dynamic model [J] . Control Engineering Practice, 2001, 9 (2) : 181-187.
5CHUNG D.W, RYU H.M, LEE Y.M. Drive systems for high-speed gearless elevators [J] . IEEE Industry Appli- cations Magazine, 2001, 7 (5): 52-56.
