STMicroelectronics ST7FMC Enhanced Sensorless Startup Control Application Note AN2502

About this manual

The document details how the ST7FMC microcontroller controls 3-phase brushless DC (BLDC) motors in position sensorless mode. It highlights a specific capability to monitor zero crossings of all three back EMF voltages directly without attenuation, allowing for startup from zero speed without the need for initial rotor stepping.

What's inside

• Introduction
• Implementation
• Experimental results
• Conclusion
• Associated software
• Revision history

Frequently asked questions

What voltage is the BLDC motor tested on in this application note?

The concept was implemented using a starter kit to run an onboard 24V Ametek BLDC motor.

What is the minimum voltage level mentioned for which this method will be even more reliable?

The document states that for higher voltage motors, such as 300V DC, this method will be even more reliable.