SEW-EURODRIVE Products: Low backlash Servo Gear Unit / Servo Gearmotor PSF/BSF Series

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> PSC series planetary gear units

The highest level of precision, torque and overhung load: Low backlash planetary and helical-bevel servo gear units

Your advantages

Compact, lightweight design

Highest permitted torques and overhung loads

High efficiency levels

Highest level of reliability, availability and durability

Adaptor is eliminated, which cuts costs

Planetary servo gear units

PSC series

The low backlash PSC planetary servo gear units are designed for the 30 to 305 Nm torque classes. They were designed to combine the greatest possible flexibility and cost-efficiency because not every application requires high-performance components.

They provide a basis for diverse, dynamic and cost-optimized drive solutions.

The PSC planetary servo gear units are available in the following versions:

PSC = B5 output, smooth output shaft

PSKC = B5 output, with keyway

PSCZ = B14, output, smooth output shaft

PSKCZ = B14 output, with keyway

Technical data
Size	Torque class [Nm]	Reduction ratios
Size	Torque class [Nm]	1-stage [i]¹	2-stage [i]²
220	30	3 / 5 / 7 / 10	15 / 21 / 25 / 30 / 35 / 49 / 50 / 70 / 100
320	65
520	160
620	320	5 / 7 / 10	25 / 35 / 49 / 50 / 70 / 100
1) Max. circumferential backlash: 10' for all versions 2) Max. circumferential backlash: 15' for all versions

	PSF series
	The low backlash PSF planetary servo gear units are designed for the 25 to 3000 Nm torque classes. The permitted acceleration torques are significantly higher than these values. Three output versions are available: PSF: Solid shaft PSKF: Solid shaft with key PSBF: Flange block shaft in accordance with EN ISO 9409

Technical data
Type	Size	Torque class [Nm]	Reduction ratios ¹		Circumferential backlash
Type	Size	Torque class [Nm]	1-stage [i]	2-stage [i]	1-stage [i]	2-stage [i]
PSF	120	25	3 / 4 / 5 / 7 / 10²	15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 100³	8 / 4 / 2	10 / 6 / 3
PSF / PSBF	220	55			6 / 3 / 1⁴⁵⁶	8 / 4 / 2
PSF / PSBF	320	110
PSF / PSBF	520	300
PSF / PSBF	620	600			4 / 2 / 1	6 / 3 / 1
PSF / PSBF	720	1000
PSF / PSBF	820	1750
PSF	920	3000
1) Further reduction ratios on request 2) Only PSF 3) Only PSBF 320/520, further reduction ratios on request 4) Standard 5) Reduced 6) Minimized

Helical-bevel servo gear units

BSF series

The low backlash BSF helical-bevel servo gear units are designed for the 40 to 1500 Nm torque classes. The permitted acceleration torques are significantly higher than these values.

These right-angle servo gear units are available in five output versions:

BSF: Solid shaft

BSKF: Solid shaft with key

BSBF: Flange block shaft (EN ISO 9409)

BSHF: Hollow shaft with shrink disc

BSAF: Hollow shaft with keyway (Shaft mounted gear unit)

All versions are equipped with a B5 mounting flange and optional foot mounting and torque arm. Because of this, these drive units can be optimally integrated into existing applications. The combination of a helical input stage and a hypoid output stage results in ratio ranges which can be covered by the single-stage bevel (wheel) and hypoid gear unit or by the single-stage helical-worm gear unit with high transmission quality. The circumferential backlash remains constantly low throughout the gear unit’s service life.

Technical data
Size	Torque class [Nm]	Reduction ratios	Circumferential backlash [’]
Size	Torque class [Nm]	2-stage [i]	Circumferential backlash [’]
202	40	3 / 4 / 6 / 8 / 10 / 15 / 20 / 25	6 / 3¹²
302	80	3 / 4 / 6 / 8 / 10 / 15 / 20 / 25 / 30
402	160	3 / 4 / 6 / 8 / 10 / 15 / 20 / 25 / 30
502	320	3 / 4 / 6 / 8 / 10 / 12 / 15 / 20 / 25 / 30 / 35
602	640	3 / 4 / 6 / 8 / 10 / 12 / 15 / 20 / 25 / 30 / 35 / 40
802	1500	3 / 4 / 6 / 8 / 10 / 12 / 15 / 20 / 25 / 30 / 35 / 40
1) Standard 2) Reduced

Accessories and options for servo gear units and servo gearmotors

Motor adapter

The EPH motor adaptor for planetary servo gear units and EBH motor adaptor for helical-bevel gear units can be used to connect all commercial servomotors in a simple and time-efficient manner to servo gear units from SEW-EURODRIVE.

Reduced backlash

Optional for planetary servo gear units and helical-bevel servo gear units. The circumferential backlash of these gear units is considerably less than that of the standard versions so that positioning tasks can be solved with great precision. The circumferential backlash is specified in angular minutes [ '] in the technical data.

Minimized circumferential backlash

Optional for planetary servo gear units. The circumferential backlash of these gear units is reduced even further than that of the reduced backlash version and therefore allows for even greater precision when performing positioning tasks.

PSC series planetary gear units

Thanks to its high degree of flexibility and variability, the PSC gear unit series offers economic solutions for many applications. Combined with drive electronics from SEW-EURODRIVE, they provide customized, cost-optimized drive solutions that ensure a high level of process reliability in system operation. The variability in the tried and tested modular system allows for simple integration into existing automation systems.

PSC series overview

4 sizes

Choice of 2 output flanges (B5 or B14)

Torque range of 30 to 350 Nm (270 to 3100 in-lb)

Very high power density thanks to direct motor mounting

Large variety of reduction ratios

Flexible motor mounting thanks to new adapter concept

Reliability thanks to application-specific lubrication: Oil / grease

Operation independent of mounting position

Exterior surface protection OS1 to OS4 optional

May be used wherever varied or reduced machine performance requires adjustable drive engineering. Cost-effectiveness is the key criterion.

For more information about the PSC servo gear unit series, contact:

Christof Völkel, Marketing & Engineering

Servo Drive Technology

Tel.: +49 (0)7251 75-2487, Fax: +49 (0)7251 75-502487


	Operating Instructions: BS.F.., PS.F.. and PS.C.. Series Gear Units

	Brochures: The new PSC low backlash servo planetary gear units