Inductance-Measuring Algorithms Speed Start Up Of Sensorless BLDC Motors

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

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 this Source (requires a PDF Viewer installed on your device)

• Return to Search Result
• Start Another Search
• How2Power Home
• How2Power Full Website