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Low backlash Servo Gear Unit / Servo Gearmotor PSF/PSC/BSF Series

PSF planetary servo gear units

PSF series

The low backlash PSF planetary servo gear units are designed for the 25 to 3,000 Nm torque classes. The permitted acceleration torques are significantly higher than these values.

Three output versions are available:
  • PSF: B5 output, solid shaft
  • PSKF: B5 output, solid shaft with key
  • PSBF: B5 output, flange block shaft according to EN ISO 9409
Technical data
Type Size Torque class
[Nm]
Gear ratios1 Circumferential backlash
1-stage 2-stage 1-stage [i] 2-stage [i] 1-stage [i] 2-stage [i]
PSF 121 122 25 3 / 4 / 5 / 7 / 102 15 / 16 / 20 / 25 / 28 / 35 / 40 / 49 / 70 / 1003 8 / 4 / 2 10 / 6 / 3
PSF/PSBF 221 222 55 6 / 3 / 1456 8 / 4 / 2
PSF/PSBF 321 322 110
PSF/PSBF 521 522 300
PSF/PSBF 621 622 600 4 / 5 / 7 / 10 4 / 2 / 1 6 / 3 / 1
PSF/PSBF 721 722 1,000
PSF/PSBF 821 822 1750
PSF 921 922 3,000
1) Further gear ratios on request
2) Only PSF
3) Only PSBF 320/520, further gear ratios on request
4) Standard
5) Reduced
6) Minimized

PSC planetary servo gear units

PSC series

The low backlash PSC planetary servo gear units are designed for the 30 to 320 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, solid shaft
  • PSKC = B5 output, solid shaft with keyway
  • PSCZ = B14 output, solid shaft
  • PSKCZ = B14 output, solid shaft with keyway
Technical data
Size Torque class
[Nm]
Gear ratios
1-stage 2-stage 1-stage [i]1 2-stage [i]2
221 222 30 3 / 5 / 7 / 10 15 / 21 / 25 / 30 / 35 / 49 / 50 / 70 / 100
321 322 65
521 522 160
621 622 320 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

BSF helical-bevel servo gear units

BSF series

The low backlash BSF helical-bevel servo gear units are designed for the 40 to 1,500 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 disk
  • 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]
Gear ratios 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
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 1,500
1) Standard
2) Reduced

Accessories and options for servo gear units and servo gearmotors

Options for servo gear units and servo gearmotors
Direct motor mounting Positive direct mounting of CMP SEW servomotors without terminal adapter
Motor adapter EPH motor adapter for PS.F and PS.C planetary servo gear units, ECH motor adapter for PS.C planetary servo gear units and EBH motor adapter for BS.F helical-bevel servo gear units.
Reduced backlash Optional for PS.F planetary servo gear units and BS.F helical-bevel servo gear units with a significantly lower circumferential backlash
Minimized circumferential backlash Optional for planetary servo gear units with significantly reduced circumferential backlash once more