Chopper stabilization is an ideal
embedded technology for latching sensors in BLDC motors
Truth: Although chopper stabilization can offer high sensitivity and more magnetic stability, it has several drawbacks including slower response time, accuracy error (due to sampling), and electrical noise generation.
Hall effect sensors are operated by a magnetic field from a permanent magnet or an electromagnet responding to North and South Poles. These magnetic sensors measure the change in magnetic field and communicate the position of the motor shaft to a logic unit, which uses this information to determine when the current should be applied to the motor coils to make the magnets rotate at the correct orientation.
refer to: http://industrial-embedded.com/articles/busting-three-myths-chopper-stabilization/
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