Technical data

16-2 Notes Application MHD Sychronous motors
DOK-MOTOR*-MHD********-PR05-EN-P
Vibration and shock loading
MHD motors can carry loads, such as are typically occurring in case of
presses, punches, or press inlets, only if they are attached in a shock-
absorbed or shock-decoupled way. The construction of such attachments
must be checked in isolated cases.
According to IEC 721-3-3 ed. 1987 and EN 60721-3-3 ed. 06/1994, MHD
motors, if used stationary and weather-resistant, may be operated under
the following conditions:
Longitudinal motor axis:according to Class 3M1
Transverse motor axis: according to Class 3M6
Ensure that the limits specified in Fig. 16-2: Limits for sinusoidal vibrations
and Fig. 16-3: Limits for shock load
for storage, transport, and operation of the MHD motors are not
exceeded.
Influencing quantity Unit Maximum value
in longitudinal
axis
Maximum value
in transverse
axis
Amplitude of the excursion at 2
to 9 Hz
mm 0,3 7,0
Amplitude of the acceleration at
9 to 200 Hz
m/s² 120
Fig. 16-2: Limits for sinusoidal vibrations
Influencing quantity Unit Maximum value
in longitudinal
axis
Maximum value
in transverse
axis
Total shock-response spectrum
(according to IEC721-1, :1990;
Table 1, Section 6)
Type L Type II
Peak acceleration m/s² 40 250
Duration ms 22 6
Fig. 16-3: Limits for shock load
Note: Motors with attached blowers are not suitable for applications
subjected to shock loads, such as are occurring in case of
punches,
presses, or
loading portals.
In such cases, motors without surface-cooling and a higher
torque must be used.