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Implementing Embedded Speed Control for Brushless DC Motors: Part 2

Authored on: Jun 20, 2007 by Yashvant Jani

Technical Paper / Conference Paper

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Brushless Direct Current (BLDC) motors, also known as permanent magnet motors, are used today in many applications. A new generation of microcontrollers and advanced electronics has overcome the challenge of implementing required control functions, making BLDC motors more practical for a wide range of uses.

In Part 2 of this paper, we build on the fundamentals of BLDC motor operation and control covered in Part 1, turning our attention from six-step 120-degree modulation to an examination of 180-degree modulation. We also discuss sinusoidal modulation and look at an example of code used to generate a sine wave. We then discuss open-loop V/f control and closed-loop control. The paper ends with an overview of vector control.

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