Planetary gearbox for precision motion — 15:1 reduction, 44 N.m continuous
The GBX0600150583D is a straight-tooth planetary gearbox from Schneider Electric's GBX series, sized for servo and stepper motor applications that need a compact 60 mm diameter package with a 15:1 reduction ratio. Continuous output torque is 44 N.m, with a maximum intermittent rating of 70 N.m — the 44 N.m figure is the one to design around for duty cycles that run past the thermal time constant of the housing. Efficiency sits at 94 %, meaning 6 % of the input power is lost as heat in the gear mesh and bearings; for a 400 W servo that's about 24 W dissipated in the gearbox body, well within the black anodised aluminium housing's thermal budget at 30 °C ambient.
Torsional backlash is 25 arc.min maximum — that's the lost motion at the output shaft when the input reverses direction. For a positioning axis that indexes to a hard stop or a ball-screw nut, 25 arc.min translates to roughly 0.42° of output-shaft play; if the application needs tighter repeatability, a lower-backlash variant from the GBX family is the right call. Torsional rigidity is 2.5 N.m/arcmin — under the 44 N.m continuous load the output shaft twists about 17.6 arcmin from the elastic wind-up alone, before any backlash. That wind-up is recoverable (it springs back when the load drops), but a position loop that doesn't account for it will chase the error. Maximum axial force on the output shaft is 450 N at 100 rpm for the full 30000-hour service life, or 600 N if the life target drops to 10000 hours. Radial force (applied at mid-shaft) is 340 N for 30000 hours, 500 N for 10000 hours. These are the bearing limits — overhung loads from a belt pulley or a pinion gear must stay under these numbers or the bearing race spalls early.
Mounting, sealing, and service life — integration notes
Mounting position is any orientation — the lifetime lubrication means no oil-level check or breather orientation constraint. The shaft output seal is rated IP54, so the gearbox resists dust ingress and splashing water at the shaft exit, but it is not submersible or washdown-rated. Service life is 30000 hours at 100 rpm output speed and 30 °C ambient — that is about 3.4 years of continuous 24/7 operation at that speed. Running at higher output speed or ambient temperature above 30 °C reduces life; the 30000-hour figure is the baseline for sizing. Moment of inertia reflected to the input is 0.077 g.cm² — negligible for most servo sizing calculations, but worth adding to the reflected load inertia when the motor inertia is below 0.5 g.cm².