Installation
Design Guidelines
«EC frameless DT» Installation Manual
3-14
mmag | 2021-12 | rel10341
3.2
Design Guidelines
Important note on the design
The correct technical design of the bearing arrangement and the integration into the application’s housing
are the sole responsibility of the customer.
• maxon does not make any suggestions as to how a customer-side integration into the respective applica-
tion must be designed and laid out or what it should look like.
• The points listed below are intended to serve as an aid and to show (in a non-exhaustive manner) which
drive-side aspects need to be taken into account in a customer-built design.
• The points listed below do not claim to be complete.
3.2.1
Geometric Tolerances
The dimensional drawings (see
Appendix as of page 30) show the shape and position tolerances of sta-
tor to rotor. Other tolerances may apply to specific motor designs, which will be communicated by appropri-
ate means.
Compliance with the designated tolerances is vital and guarantees that the motor achieves the specified
performance data (such as torque and speed). Even minor deviations from the specified form and position
tolerances will result in a reduction of the performance data. Exceeding deviations can lead to stripping of
the rotor, to an increased cogging torque, and to permanent damage to the motor.
maxon therefore urgently recommends that the specified form and position tolerances indicated in the
dimensional drawings be observed.
3.2.2
Mechanical Design
The customer's components (for example housing and shaft) must be designed for the expected mechani-
cal loads and forces in terms of strength, rigidity, and stability.
3.2.3
Magnetic Forces
The rotor of the «EC frameless DT» is equipped with strong magnets. As a result, large forces can occur in
both the axial and radial directions. Note this in particular with regard to the following topics:
•
Bearing arrangement
•
Calculations for strength and stiffness
•
Joining the individual components during assembly
•
Maintenance
•
Dismantling and deconstruction
With rotor and stator arranged in accordance to the specifications on the dimensional drawings (see
page 2-8), then the axial and radial forces emanating from the magnetic field are minimal.
3.2.4
Heat Dissipation
The stator of the «EC frameless DT» must be thermally well connected to the customer’s housing. This can
be achieved by the design and material selection of the housing and via suitable fit tolerances.
