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Chapter 3: AC and DC Motors - Chapter Review
By Dave Polka
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Chapter 3: AC and DC Motors - Chapter Review
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 (fixed-voltage field exciter). Speed of the DC motor is directly controlled by the magnitude of the armature...


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Products & Services
Electrical winding services fabricate custom-wound assemblies for a wide range of applications, including automotive, avionics, motor, transformer, medical instrumentation and power generation applications.
Gearmotors consist of an AC or DC motor with an integral gearbox or gear head that steps delivered speed up or down.
Linear motors generate force only in the direction of travel. They are capable of extremely high speeds, quick acceleration, and accurate positioning.
AC motors include single, multiphase, universal, induction, synchronous, and gear motors. They also include servomotors.  
DC servomotors are generally small and powerful for their size, and easy to control. Common types of DC servomotors include brushless or gear motors.
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Product Announcements
Benshaw, Inc. - Synchronous Starters
The Sync motor functions as an induction motor during start up. Once the motor approaches full synchronous speed, the Redistart DC exciter induces a constant polarity to the rotor causing the motor to... (read more)
ARC Systems, Inc. - Induction Motors
ARC's complete lines of AC Induction Motors are manufactured using a squirrel cage rotor utilizing both aluminum and copper bars. Speed and torque can be tailored to individual requirements by... (read more)
Portescap, A Danaher Motion Company - The Ironless Rotor Motor Technology
A state-of-the-art motor line, The Portescap D.C. motor, results from an original concept based on an ironless rotor, combined with a commutation system using either precious metals or a carbon/... (read more)
CHINA MS Motor Co., Ltd. - AC Servo Motor
CHINA MS Motor Co., Ltd. is proud to bring you their AC Servo Motor. (read more)
Moog Components Group - Brushless DC Motors
Our brushless DC motor capabilities provide solutions in a wide variety of applications. These motors are designed for use in high-speed, continuous operation applications, where they operate with low... (read more)
Ace World Companies - Controls
From standard control panels to custom panels and automation, Ace World Companies has everything you need for controls. (read more)
LCR Electronics, Inc. -  Electronic Motor Control Design
LCR specializes in design, development and manufacturing of standard and custom Electronic Motor Controls for various types of motors used in diverse applications. (read more)
ARC Systems, Inc. - Single Phase Induction Motors
ARC Systems, Inc. offers a variety of Single-Phase Induction motor designs. We have thousands of custom designs and modifications that can be tailored to your application. Special shaft requirements;... (read more)
Beckhoff Automation LLC - Beckhoff AM3000 Pole-wound Servomotors
The new AM3000 Synchronous Servomotor series from Beckhoff Automation expands the company's drive motor range with a compact, high-performance variant. Pole-wound motors feature a significantly higher... (read more)
 
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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... (Read More)
TYPES OF MOTORS Alternating-Current Motors SQUIRREL-CAGE INDUCTION MOTOR  By far the most common motor used to drive pumps is the squirrel-cage induction motor (Figure 1). This motor consists of... (Read More)
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... (Read More)
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... (Read More)
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... (Read More)
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