Current Flow Analysis in Permanent Magnet Brushless DC (BLDC) Motor Control Using PSpice

Focus:

To drive a brushless dc (BLDC) motor, the windings are connected to an inverter and the inverter energizes the windings in a pattern that rotates the magnetic field around the stator. The energized stator winding causes the PM rotor to rotate in a synchronous fashion around the stator. So it is important to know the perfect sequence to energize the stator windings. Simulation could offer a convenient means for determining the optimum sequence for energizing the windings. However, methods for performing this type of simulation using popular tools such as Spice are not widely known in the industry. This article presents a step-by-step procedure for simulating a BLDC motor control system using PSpice. The article begins by reviewing the evolution of permanent magnet materials and principles of operation for BLDC motors then provides a mathematical model of a three-phase star-connected BLDC motor, a back EMF model in PSpice, a PSpice model for a BN-23 motor, and a PSpice model for the inverter. The authors use the PSpice models to simulate three-phase motor currents for the BLDC motor control system and then analyze the results.

What you’ll learn:

• How to use PSpice to simulate current flow in a brushless dc motor control system
• How to model brushless dc motor control systems to determine the optimum sequence for energizing the stator windings

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Author & Publication:

Amitabh Mallik and Rakesh Dhawan, Strategic Technology Group, Pune, India, How2Power Today, Dec 16 2010

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