New encoder design for brushless flat motor further reduces length

Flat brushless DC motors use maxon’s new mile encoder technology to even further reduce motor length. The first picture shows what used to be a very elegant solution using an aluminium cover to contain the motor’s external rotor, also acting as a mounting. The disadvantage is the motor needs to be manufactured with a custom rear shaft, adding to cost and the encoder (although low profile) adds to the length.

The new encoder overcomes these problems as well as of increasing resolution. The second picture is the MILE encoder, inductive based using a high frequency alternating field and a structured copper disc to derive angle dependent information. This technology is very robust against magnetic and electrical fields and contamination from harsh operating environments. The electronics are all inside the motor between the rotor and the stator of the outrunner style brushless f lat motors, enhancing form factor and making it suitable for space-critical motor applications in manufacturing fields. Resolutions available up to 25,600qc.