Most of the equipment that we monitor every day is driven by an electric motor. All these motors may look similar but, they are different. Each motor has been selected for a specific application. When looking inside the motor, we can see that the rotor and the stator are different from one motor to another one. This will modify the behavior of the motor. A motor design for driving a compressor will not necessarily fit for a water pump or a conveyor. Theses difference in their construction will have an important influence on their own vibration. In this presentation we will examine different types of motors and their vibration.