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Designing High-Performance and Power Efficient 3-Phase Brushless DC Motor Control Systems

Designing High-Performance and Power Efficient 3-Phase Brushless DC Motor Control Systems

Today motor control systems are used by engineers use for both digital and analog technologies to conquer past challenges including motor speed control, rotation direction, drift and motor fatigue. The application of MCUs has enabled this generation of engineers the opportunity to dynamically control motor actions so that they respond to environmental stresses and conditions. This will help to provide a longer operational lifetime and reduce maintenance which means lower cost. Currently, motor manufactures are gravitating towards 3-Phase BLDC motors because they provide more torque for less power and have a longer operating time due to no direct contact from the commutator and electrical terminals such as is found in the brushed motors. Regrettably, the use of 3-Phase motor control adds additional complexity compared to brushed DC or AC motors and the relationship between digital and analog components becomes very important.

This whitepaper discusses a summary of the concerns that should be factored in when using analog components and microcontroller in a 3-Phase BLDC motor application. It also covers the suitable power management devices and power level shifters that enable the microcontrollers to drive motors form power sources from 12V all the way up to 300V DC voltages.

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