ABSTRACT

Electric motors are characterized by the ability to classify them in sizes and capacities ranging from very small that can be placed in the clocks to the very large used in large cranes and in various industries. The electric motors have been used in the operation of various types of modern devices and equipment that emerged with the emergence of these motors such as audio and video recorders, computer drives, printers, games, and industrial robots of uses. In induction motors, the speed of the magnetic field of the stator is higher than the actual speed of the rotor. The reason is the air resistance of the rotor, and the friction between the axis of rotation and the supports. To operate the motor, rotor rotation is required by creating a primary torque. This is done by displacing the magnetic field in the rotor from its position to create an angle between it and the magnetic field in the constant.