A drive must know the relative position between a servo motor's encoder and the rotor. This article describes the theory why and how to acheive optimal motor control.
Encoder Position for Permanent Magnet Motors in Elevator
Elevator Encoders for Elevator Motor and Door Control
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Motor Solution Using a Magnetic Encoder
PDF) Linear motor for multi–car elevators: design and position
What's the Difference Between AC Induction, Permanent Magnet, and
775 Motor AB Phase Hall Magnetic Encoder is a high performance, low cost, two channel incremental Type magnetic encoders, suitable for any harsh
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Figure 13 from Initial rotor position detecting algorithm of PM
Sensors, Free Full-Text
elevator car door operator