Before You Start; Cleaning; Axial Attraction - Tecnotion QTR 65 Series Manual

For QTR 105, QTR 133 and QTR 160 motors the rotor and stator are separated
in the packaging. Installation requires the removal of the magnetic protec-
tion ring and insertion of the rotor in the stator. Because there is a consider-
able amount of attraction force between rotor and stator special tooling
and/or non-ferromagnetic shims are required.
4.3

Before you start

The magnets on the rotor are attracted by the ferromagnetic material in the
lamination stack of the stator. This attraction is present in two directions,
axial and radial. During installation specific tooling or system design is
required to enable controlled and safe insertion of the rotor into the stator.
Perform the installation checks below before installing the components.
■
Check axial attraction force and radial attraction force and size tooling
accordingly.
■
Always use non-ferromagnetic tooling for the rotor assembly.
■
Specific tooling is required for mounting the connectors to the power
and sensor cables. Please verify with your connector supplier what
tooling is required.
Check the installation video on

4.3.1 Cleaning

The stator and rotor can be damaged when cleaned with a non-
prescribed cleaning agent. Use only isopropanol as a cleaning agent.
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Oxidation on the lamination stack surface can be removed with
Scotch-Brite.
For general, non-cleanroom applications, the rotor and stator do not need
to be cleaned before installation or commissioning. For cleaning purposes
Tecnotion prescribes isopropanol as cleaning agent for the stator and rotor.

4.3.2 Axial attraction

The rotor is attracted by the stator in axial direction. The forces are the larg-
est when the rotor starts to enter the stator, see Figure 28. It is in equilibrium
when the rotor is symmetrical between the lamination stacks. The axial
forces for QTR 65, 78, 105, 133 and 160 are shown in Figure 29 through
Figure 33.
Area where attraction force increases exponentially
A
B
Figure 28: Behaviour of axial attraction forces
A- Attraction force increases exponentially
B - Attraction forces are in equilibrium
INSTALLATION
D
D=0
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