10
Project planning
MOVIMOT® advanced
Operating Instructions – MOVIMOT
®
advanced
231
Churning losses and thermal rating
Churning losses may occur with the following conditions. They must be considered
during thermal check:
• A mounting position where the first gear unit stage is fully immersed in the lubri-
cant. The respective mounting positions of the gear units are marked with * in
chapter Mounting position sheets.
• A high mean input speed and thus a high circumferential speed of the gear wheels
of the input gear stage.
If one or both conditions are present, determine the requirements of the application
and the corresponding operating conditions (see chapter "Data for calculating the
thermal rating" (→ 2 231)) and contact SEW-EURODRIVE. SEW‑EURODRIVE can
calculate the thermal rating based on the actual operating conditions. The thermal rat-
ing of the gear unit can be increased by appropriate measure e.g. by using a synthetic
lubricant with higher thermal endurance properties.
INFORMATION
To reduce churning losses to a minimum, use gear units preferably in M1 mounting
position.
Data for calculating the thermal rating
The following information is required for calculating the thermal rating:
Gear unit type and design:
• Gear unit ratio i
• Mean input speed n
Mot
or mean output speed n
G
in min
-1
• Effective motor torque M
Mot_eff
in Nm
• Input motor power P
Mot
in kW
• Mounting position M1 – M6 or pivoting angle
Installation site:
• Ambient temperature T
amb
in °C
• Installation altitude
• In small, closed rooms or in large rooms (halls) or outdoors
Installation on site:
• Space-critical or well ventilated
• Steel base or concrete base
More information
For more information, refer to the "MOVIMOT
®
advanced Gearmotors" catalog.
25891936/EN – 05/2020
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