BOOK_CONTENT
From Motors and Drives

AC and DC motors are the two major types in use today that are related to the industrial and HVAC applications. These motors provide the speed, torque, and horsepower necessary to operate the application. The motor changes one form of energy (electrical) to rotational or linear motion (mechanical).

The two major components of a DC motor are the armature and field winding. The armature is the rotating part that is physically connected to the shaft and develops magnetic flux around its windings. The field winding is the part of the stationary frame and provides the flux necessary to interact with the armature flux to produce rotation. The commutator acts as an electrical switch and always ensures that a repelling force is present between the armature and field flux circuits. This repelling force against the field winding flux causes rotation of the armature. Brushes are the devices that physically connect the voltage supply to the armature circuit. Brushes are constructed of carbon material and require routine maintenance or replacement to reduce arching at the commutator segments.

Two separate voltage supplies are connected to the DC motor, one for the armature (variable DC voltage armature supply) and one for the field winding...


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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.
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.
AC Motors
AC motors include single, multiphase, universal, induction, synchronous, and gear motors. They also include servomotors.  
Linear Motors
Linear motors generate force only in the direction of travel. They are capable of extremely high speeds, quick acceleration, and accurate positioning.
AC Motor Drives
AC motor drives interface controllers to AC motors. They match the control signals (voltage and power levels) as well as the signal type (analog or digital). They also provide power conversion, amplification, and the sequencing of waveform signals.

Topics of Interest

What are the two main parts of a DC motor and what is the purpose of each? What is the purpose of the brushes? Why are the laminations in the armature skewed? What is the purpose of the...

ALTERNATING-CURRENT MOTORS 146. General construction of polyphase induction motors. Polyphase induction motors have two windings, one on the stationary part of the machine, or stator, and one mounted...

Basic Components Two basic circuits are in any DC motor: the armature (the device that rotates, sometimes referred to as a rotor) and the field (the stationary part, sometimes referred to as a stator...

Introduction Basically, four different types of DC motors are used in industrial applications: series wound, shunt wound, compound wound, and permanent magnet. Several factors must be considered when...

IEC Ratings At this point, it would be helpful to briefly review IEC motor ratings and then compare IEC with NEMA. The motor market today has become more global, with IEC rated motors on equipment...