Speed control of turbo compressors

The types of compressors are localized to suit speed control. The reasons justifying the use of speed control are explained. Various designs of hydrodynamic drives used for spaed control are introduced including a detailed description of the VORECON multi stage variable speed, its operation and applications. The efficiencies are compared with electrical speed control, followed by a discussion about the general economic efficiency. Presentation of an example of an executed unit.