From Motors and Drives

AC Induction Motor
The main parts in an AC induction motor is the rotor (rotating element) and the stator (stationary element that generates the magnetic flux). The

The squirrel cage motor is the simplest to manufacture and the easiest to maintain. The operation of the squirrel cage motor is simple. The threephase current produces a rotating magnetic field in the stator. This rotating magnetic field causes a magnetic field to be set up in the rotor also. The attraction and repulsion between these two magnetic fields causes the rotor to turn. This concept can be seen in Figures 3-24 and 3-25

The squirrel cage motor is a constant-speed motor with either a normal or high starting torque. These characteristics fulfill the requirements of the majority of industrial applications.

The concept of the rotating magnetic field is shown in Figure 3-26. This figure shows the relationship of the three-phases versus pole magnetic fields. Each magnetic pole pair is wound in such a way that allows the sta-

tor magnetic field to "rotate." The stator of the motor consists of groups of coils wound on a core, which are enclosed by a frame. The simple two-pole stator shown in Figure 3-26 has...


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Products & Services
Electrical Winding Services
Companies that specialize in the fabrication of custom wound assemblies for a wide range of electrical applications and industries. Electrical winding services also includes the repair and refurbishing of individual wound components.
Motor Coils
Motor coils are used with motors, generators, stators, and armatures.
Linear Motors
Linear motors generate force only in the direction of travel. They are capable of extremely high speeds, quick acceleration, and accurate positioning.
Brushless Motors
Brushless motors are synchronous electric motors that have a magnetically (AC induction) or electronically (DC) controlled commutation system instead of a brush-based mechanical commutation system.

Topics of Interest

Magnetic Field (Rotor) The rotor is the rotating part of the motor. The rotor consists of copper or aluminum bars, connected together at the ends with end rings. Refer to Figure 3-27. The inside of...

In induction machines, the rotor voltage (which produces the rotor current and the rotor magnetic field) is not physically connected by wires to the rotor windings it is induced in the rotor. The main...

Given that a very high percentage of the electrical loads in the world are electric motors, this chapter pays specific attention to design of electrical systems for these very important loads. While...

Control of Speed, Torque, and Horsepower Control of Speed The speed of a squirrel cage motor depends on the frequency and the number of poles for which the motor is wound. The higher the frequency,...

OVERVIEW Alternating current (AC) machines are motors that convert AC electric energy to mechanical energy, and generators that convert mechanical energy to AC electric energy. The two major classes...