Introduction

ABB has great experience in offering Crane and Hoist duty motors both for DOL operation as well as for VFD applications. They conform to IS : 325 for Threephase Induction Motors and IS : 4722 for Rotating Electrical Machines .The size of the motor is governed by the mechanical effects of starting and braking fuctions, the type of control and the number of switching per hour. The rated output, the number of starts/hour and the inertia (i.e load GD2 +rotor GD2) are interdependent.