Beard, Richard D., Editor. Electric Motors. Refrigeration Service Engineers
Abstract: This article explains electricity and magnetism and
how they are related. The article also explains how an electric motor works
and the different types of electric motors. Basically, the law of electricity
states that an induced current is in the opposite direction to the current
that produced the induced current. The induced current's magnetic field
will naturally oppose the other magnetic field causing the armature magnets
to push away the field magnets. This causes a rotation, which produces the
electric motor. The article explains this process in detail and explains
the many other factors involved.
The article goes on to describe the different types of motors and their
differences. Induction, split-phase induction, capacitor-start induction,
repulsion-induction, three-phase, and others are explained with diagrams.
The next section of the article explains how heat is produced from an
electric motor. Most of the heat produced is from resistance and friction.
Most motors are designed to accommodate this heat; however, the motor must
be used and maintained properly. There must be enough space surrounding
the motor for it to release its heat and objects should not be stored near
the motor. The room in which the motor is operating should not be above
40 C. It is important to monitor the heat a motor generates because if it
gets too hot it can damage the insulation, the wires, or the protective
devices of the motor.
For more information, contact:
Refrigeration Service Engineers Society
666 Rand Road
DesPlaines, IL 60016-3552
Fax: (847) 297-5038