Thursday, December 17, 2009

Brushed DC Motor Basics Video

Brushed DC Motor Basics Part 1 of 2
This video on brushed DC motor basics is part 1 of a four part series of web seminars that will go into motor control drive topologies, pulse width modulation ( PWM ), and the new enhanced PWM.

Brushed DC Motor Basics Part 2 of 2

Brushed DC Motor Fundamentals
Brushed DC motors are widely used in applications
ranging from toys to push-button adjustable car seats.
Brushed DC (BDC) motors are inexpensive, easy to
drive, and are readily available in all sizes and shapes.
This application note will discuss how a BDC motor
works, how to drive a BDC motor, and how a drive
circuit can be interfaced to a PIC® microcontroller.

The construction of a simple BDC motor is shown in
Figure 1. All BDC motors are made of the same basic
components: a stator, rotor, brushes and a commutator.
The following paragraphs will explain each component
in greater detail.


AC or DC? Brushed or Brushless?

DC Motors provide high power in a small package. Oriental Motor manufacturers a wide range of AC and brushless DC (BLDC) products. So why choose one technology over the other? There are several key differences between the different technologies.

Motor Construction

Brushed DC motors depend on a mechanical system to transfer current, while AC and brushless DC motors use an electronic mechanism to control current. The brushed motors have a wound armature attached to the center with a permanent magnet bonded to a steel ring surrounding the rotor. As the brushes come into contact with the commutator the current passes through to the armature coils.


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