Electric power application to passenger and freight elevators

This Committee has been requested to report on the application of electric power to passenger and freight elevators. An enormous amount of electric energy is used for the operation of elevators and it is therefore fitting that the problem be studied from a power economy standpoint as well as from the more important standpoint of protection to life and limb. It is assumed that the reader knows little of this subject and that practically nothing up-to-date has been published. It is not believed that the reader will be particularly interested in accurate technical details, but that he will want to know the range of application of elevators, their motors, controllers and all safety appliances as represented by best present practise. Included in this report are six chapters as follows: I. History and service requirements. II. Types of elevator machines and the limitation of each. III. Charateristics and limitations of d-c. and a-c. motors. IV. Elevator controllers. V. Brakes and other safety accessories. VI. Power consumption.