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The article discusses the functionality of hydrostatic transmissions (HSTs) which transmit rotary power from an internal combustion engine. Topics discussed include the operating principle and configuration of HSTs, types of constructions used in HSTs and four types of functional HSTs. Topics including the torque-speed ratio of HSTs, designing a closed circuit configuration and their cavitation control are also discussed.

The article discusses the relationship between torque and speed in a typical induction motor based on motor and power conversion. Topics include the difference in synchronous and rated speed to keep relative speed between the rotating stator field and actual rotor speed, the bilateral function of the induction motor wherein the machine operates either on the motor or alternator and the active load which causes the motor speed to increase above synchronous speed.

The article discusses advice for selecting electric motors for specific applications. The authors note that the easiest method for motor selection is matching the electrical requirements with the mechanical or physical requirements of the job. Topics include examples and methods for determining velocity, torque, and load inertia when selecting a motor.