Inductance-Measuring Algorithms Speed Start Up Of Sensorless BLDC Motors

Focus:

In a sensorless brushless dc (BLDC) motor control application, the rotor position must be known or the rotor must be aligned to a known position for motor start up. Aligning the rotor to a defined position is the most popular method, but is slow and leaves the motor vulnerable to undefined movement during rotor alignment. This article describes a low-cost method to detect rotor position in milliseconds. This method, which is based on an inductance-measuring algorithm that ensures the rotor starts in the right direction, detects saturation in synchronous permanent magnet (SPM) motors by applying high current to the motor for a very short time. This method is explained and experimental results are presented.

What you’ll learn:

• How to detect rotor position quickly to ensure safe start-up of sensorless BLDC motors

View the Source

Author & Publication:

Jiri Ryba, STMicroelectronics, Prague, Czech Republic, How2Power Today, Aug 15 2014

This article summary appears
in the HOW2POWER Design Guide.

The Design Guide offers
organized access to
hundreds of articles
on dozens of power conversion
and power management topics.

The Design Guide search results
include exclusive summaries
and accurate "how to" analysis
to help you make faster,
more informed decisions.

Search
for more articles