Dual encoder system for electric motor
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United States of America Patent
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Aug 27, 2024
Grant Date -
May 11, 2023
app pub date -
Dec 14, 2021
filing date -
Nov 9, 2021
priority date (Note) -
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Abstract
A dual encoder system includes first and second encoders on a single printed circuit board mounted on an electric motor. Each encoder independently generates feedback information used by motor and safety controllers for controlling the motor. A single magnet is mounted on the motor shaft. The first encoder cooperates with the magnet to provide first encoder information to the motor controller regarding magnetic alignment between a rotor and a plurality of stator windings of the motor and regarding real-time position and velocity. The second encoder cooperates with the same magnet to provide second encoder information to a safety controller, wherein the second encoder information should be identical to the first. The safety controller may receive the first encoder information from the motor controller, compare the second encoder information to the first encoder information, and brake the electric motor if the second encoder information is different from the first encoder information.
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