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7.1.3.2
Acting magnetic forces
The higher magnetic forces present as a result of the permanent magnets in the rotor
can draw the spindle into the stator bore.
①
②
F
a
F
r
Figure 7-10 Attractive_forces_motor_spindle
The magnitude of the present magnetic forces is motor-specific.
The present magnetic forces are contained in the table in Chapter "Magnetic forces that
occur (Page 35)".
Note
The specified radial forces are the maximum values that occur if the rotor comes into
contact with the stator at one side. For an ideally centric rotor (no eccentricity), the
resulting radial force is zero.
The radial force between a centric rotor and the rotor in contact with the stator can be
linearly converted (calculated air gap, 0.5 mm) depending on the eccentricity.
Depending upon the relative position and the weight of the rotor core, an additional axial
mounting force of about 300 N is required.
SIMOTICS M-1FE1 synchronous built-in motors
Configuration Manual, 09/2019, A5E47872980B AA
Spindle shaft with rotor core
Stator core with spindle housing
Axial attractive force
Radial attractive force
Mounting
7.1 Mechanical mounting
101
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