For applications like actuators integrating motor and gear box, two encoders are usually needed. One encoder is employed for current and speed control loop while another one is for position control loop.
“Two-in-One” encoder fits this scenario well with a single stator plate whose both sides face two rotor plates. One rotor plate is mounted on the motor shaft while another rotor plate is mounted on the output shaft of the gear box. The stator plate is able to output the position and displacement of both shafts.
This configuration reduces the part number, complexity of design and assembly, more importantly, the total thickness of assembly.
Optionally, the “Two-in-One” encoder can function as a torque sensor that is needed for high end actuators. In calibration mode, the lookup table is set up matching the angular position of both shafts unloaded and loaded. In runtime mode, the shaft torsion can be detected based on the mismatching position of both shafts. The torsion maps to the torque applied on the shaft.
Thetorquesensing function helps reducing the cost, size and complexity of the integrated actuator.
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