TABLE OF CONTENTS An electric machine is a device that can convert either mechanical energy to electric energy or electric energy to mechanical energy. Such a device is called a generator when it converts mechanical energy to electric energy. The device is called a motor when it converts electric energy to mechanical energy. Since an electric machine can convert power in either direction, such a machine can be used as either a generator or a motor. Thus, all motors and generators can be used to convert energy from one form to another, using the action of a magnetic field.
A transformer is a device that converts ac electric energy at one voltage level to ac electric energy at another voltage level. Transformers operate on the same principles as generators and motors.
? = angular position of an object. It is the angle at which it is oriented. It is measured from one arbitrary reference point (units: rad or deg).
? = angular velocity d ?/ dt. It is the rate of variation of angular position with time (units: rad/s or deg/s).
f m = angular velocity, expressed in revolutions per second = ? m/2 ?.
? = angular acceleration = d ?/ dt. It is the rate of variation of angular velocity with time (units: rad/s 2).
? torque = (force applied) (perpendicular distance). Units are newton-meters (N m)
