Hollow Shaft Servomotors RD70x18-HW270 W | 1.24 Nm | 2120 rpm | 48 V

Compact 70x18 hollow-shaft drives with industry-leading torque density for a wide range of applications.

  • Hollow-shaft
  • Industry-leading torque density
  • Excellent overload capability
  • Compact design
  • Multiturn absolute encoder with high resolution
  • Integration of hollow shaft safety brake
With the hollow shaft servo motors of the RD series RoboDrive presents high-performance motors based on the well-established stator-rotor kits. The RoboDrive technology provides the highest power density at maximum torque range and overload capability with a maximized hollow-shaft diameter in a compact design. The hollow shaft design allows to guide signals, media and fluids, rays, and cables through the motor. The integration of gear elements, spindle nuts or optics and serial actuators expands the field of applications.
The integrated absolute encoder enables high positioning accuracy and excellent speed stability. The variable concept offers solutions for a variety of demanding drive applications. On request alternative voltage levels, increased speeds, customized torque adaptations and integrated hollow-shaft safety brakes can be realized.

General data/basic data

  • 270 W
Nominal torque:
  • 1.24 Nm
Peak torque:
  • 4.05 Nm
  • 2120 rpm

Performance characteristics

Nominal voltage:
  • 48 V
Nominal current:
  • 6.7 A
Torque constant:
  • 187 mNm/A
Terminal resistance:
  • 660 mΩ
Number of pole pairs:
  • 10


  • 80 mm
Usable hollow shaft inner diameter:
  • 26 mm
Motor length without brake:
  • 79.1 mm
Motor length with brake:
  • 97 mm
Weight without brake:
  • 960 g
Weight brake:
  • 1250 g

Additional information

Sensor type:
  • Magnetic rotary encoder, BiSS-C differential, accuracy ± 0.1°, supply voltage Udd = 5 V
Detail specification:
  • See data sheet

Starter Kit (1 MB, pdf)

Order your TQ-RoboDrive Starter Kit

TQ-RoboDrive Servo Inverter SDB-40-100 available with different TQ-RoboDrive solid and hollow shaft motors.


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