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RDrive servomotor by Rozum Robotics is an all-in-one solution. RDrive servomotor unites in a single housing all the main elements: an encoder, a controller, a harmonic gear and an AC brushless motor.


RDrive by Rozum Robotics is an all-in-one high torque servo. RDrive servomotor unites in a single housing all the main elements: an encoder, a controller, a harmonic gear and an AC brushless motor. Since the servo controller is integrated into the robot motor, the RDrive is a DC servomotor with a brushless AC core.

Service life of our servo motors is 35,000 hours. Rozum Robotics also provides a 1-YEAR WARRANTY. Our online support team is eager to help you whenever needed. Detailed video instructions and technical documentation for high torque electric motor are provided. Average servomotor lead-time 2-8 weeks. A network of international dealers and distributors for local support is available.

The first RDrive servo motor was created to drive Rozum Robotics collaborative robot that we designed and built completely in house. We were disappointed with the quality of cheap Asian servos and were unwilling to pay for expensive customization in Europe. The factors motivated us to take it upon ourselves to design and create our own robotic actuator.

Most servomotor manufacturers produce a housed brushless motor coupled with an encoder. They call it a servomotor. Powered by DC current, the BLDC motors are controlled with the help of an external servo controller kit (sometimes called servo drive). In case you need a gear motor kit, you connect a gearhead to the motor. The overall design is whatever but not a compact servo motor in this case.



Supply Kit
  • 1x Servomotor
  • 1x STEP model
  • 1x API refrence
  • 1x User Manual
  • 1x CANopen communication guide
  • 1x Servobox (optional)
  • 1x Low voltage equipment and electromagnetic compatibility certificate

Available modifications

ModelRDrive 50RDrive 60RDrive 70RDrive 85RDrive 110
Power65 W225 W155 W450 W450 W
Rated Torque11 Nm39 Nm49 Nm108 Nm216 Nm
Peak torque28 Nm54 Nm82 Nm157 Nm333 Nm
Rated rotation speed55 rpm55 rpm30 rpm40 rpm20 rpm
Diameter53 mm63 mm73 mm88 mm115 mm
Length88,1 mm90,5 mm96 mm112,5 mm150 mm
Hollow shaft diameter9 mm11 mm13 mm13 mm17 mm
Weight550 g890 g915 g2100 g3900 g
Voltage48 V48 V48 V48 V48 V
Work conditions0 °C to +35 °С0 °C to +35 °С0 °C to +35 °С0 °C to +35 °С0 °C to +35 °С
Encoder2x19 bit, magnetic, absolute position2x19 bit, magnetic, absolute position2x19 bit, magnetic, absolute position2x19 bit, magnetic, absolute position2x19 bit, magnetic, absolute position
Price2,759.00 $3,311.00 $3,725.00 $4,139.00 $5,243.00 $



  • Encoders
    The built-in magnetic absolute encoders enable taking position measurements with accuracy of 19 bits. One of the devices monitors the angular motion of the output shaft, and the other returns feedback on positions of the rotor shaft. Feedback from the encoders indicates exact motor positions at a given moment and is available immediately upon powering up. No homing procedure is required because encoder readings are non-volatile. The devices are immune to temperature and humidity fluctuations, shock, vibration, and contaminants that are not ferromagnetic
  • Controller
    The controller is the core of the RDrive closed-loop motion control system. Tailored to be compatible with other structural elements, the integrated smart chip generates PWM signals to drive brushless AC motors to deliver required motion output. The RDrive controller interfaces with other servo components (encoders, temperature transducers) to read or calculate position, speed, and torque. Based on the readings and calculations, it determines whether the motor has reached the required position and speed and, if needed, tunes the motion parameters.
  • Harmonic gearbox
    Harmonic gearbox
    The RDrive series features integrated harmonic gearboxes that use the strain-wave gear technology. With the gear ratio of 1:100 and an almost-zero backlash, the technology delivers high-torque output without impacting precision of servos. The integration of the gear into the servo housing eliminates the need for additional couplings, while minimizing the risk of bearing failures due to misalignment. The motor and the gear mechanism are matched exactly to work together and require no separate design and mounting procedures, thus reducing engineering costs.
  • Brushless Motor
    Brushless Motor
    Brushless motors used in servomotors by Rozum Robotics is a lineup of compact high-torque AC motors designed as frameless rotor and stator kits. The brushless technology employed in the drives enables packing impressive power into a compact footprint, while minimizing friction-induced power losses and ensuring noise- and spark-free operation. With low cogging torque, FMI-series products provide smooth rotation without jerkiness.
  • Servo Box
    Servo Box
    Servobox solution allows for the following easy and quick integration of RDrive servos into your application, safe and correct operation of RDrive servos in the designed range of loads as well as precise control of RDrive servo motion via the Application Programming Interface.

    Servobox unit is offered as an option to RDrive servos


  • High-precision control
    Two 19-bit absolute magnetic encoders integrated into RDrive servos enable angular accuracy of 0.01 degree, including in heavy-duty applications.
  • Integrated controller
    Processes feedback from encoders and temperature sensors, while enabling highly dynamic response to control commands to deliver top engine performance.
  • High torque
    A built-in strain-wave gearhead enables reducing speed to increase torque by 100 times (gear ratio 1:100). Thanks to its zero backlash, the gear adds power to RDrive engines with no negative effect on efficiency or performance.
  • Compact size
    Less space taken by our servo motors and more space for fancy high-tech add-ons in your machines. With diameters from 53 to 115 mm, the drives can fit easily into constricted environments.
  • API control
    Python or C—you can use your preferred technology stack to implement motion control. API functions ensure easy setup and operation of RDrive motors to enable motion to your exact requirements.
  • Hollow-shaft design
    Seamless integration without impacting the overall dimensions of your machine. You can use the hole at the servo centre to pass through utilities or structural elements—cabling, pneumatic or hydraulic hosing, air supply tubes, etc.
Industrial automation
Antenna positioning

Boasting compactness and precise positioning capability, servo actuators are employed in a variety of tasks in robotics. The engines move robot joints, operate work tools, or rotate wheels in self-propelling mechanisms. Products driven with the servo motor controller
type vary from hobby models to giant industrial robots.

Small servos are quick and easy to embed into a robot body. Using micro or nano modifications, inventors create robotic hands with dexterity of movements close to a human limb. Multiple servos can be connected on the same power chain, allowing varied and flexible robot configurations.


Known for great controllability, small servo motors cope perfectly well with steering unmanned aerial vehicles, such as drones. The flying devices are designed as multi-propeller systems, where each propeller needs a drive and the total of drives should be able to work in sync.

High torque servo motors provide required driving power—and more. Small dimensions of the drives allow their smooth integration into drones of various sizes. Availability of motion feedback and highly responsive control enable accurate navigation—from launching to landing.

Industrial automation

In the domain, servo motor drivers cover various machinery: filling and packaging, metal and wood cutting, trimming, as well as CNC and textile handling machines. Servomechanisms provide such valuable benefits as simultaneous control over multiple work axes and ease of integration, including into enterprise management systems.

Feedback allows to detect abnormal moves and ensure strict compliance with command input. Turn, cut, trim, and other processing operations can be performed with consistency and uniformity. Servo motors are associated with reduced maintenance costs and remarkable accuracy due to eliminated mechanics, such as backshafts, pulleys, etc.


Show business utilizes servo actuators as part of installations to shoot movies and broadcast live games and performances. Miniature servomechanisms also shift and rotate lenses inside cameras.

Light and compact construction makes it possible to mount or replace the engines effortlessly. A motor for robot can drive cameras to precise angles as needed to provide spectacular coverage. There is also a possibility to implement complex control logic to manage multiple cameras from a single device.

Antenna positioning

In these systems, servos communicate with a specialized software that calculates coordinates for a panel to soak up sunlight or an antenna to receive a signal. The software commands to servos to move, while also processing feedback from the drives.

In this way, servos are able to provide ultra-accurate angular displacement to follow the sun or signal as required. Closed-loop governance and high holding torque make it possible to retain positions as long as necessary.

Purchase, Delivery & Service

  • 1
    Place an Order
    All it takes to place an order is to submit an online request, send us an email, or give us a call. Our technician will advise you on a proper product
  • 2
    Make a Payment
    We issue an invoice based on agreed terms and you pay it up - just as simple as that. If needed, our managers will guide you through the process
  • 3
    Wait for Delivery
    Average lead time for our orders is up to six weeks. We will deliver the purchase right to your door—wherever the door is located
  • 4
    All the products are covered with a 1-year warranty. Each of our customers gets personalized LIVE tech support from the engineering team when requested
Designed with the plug-and-run concept in mind, our RDrive motion solutions are easy to set up and operate. Instructions, drawings, and other information as required for seamless and quick integration are available on our website. When you need more specific advice, engineers at Rozum Robotics are at your service to guide you through the adoption process and address operating issues, if any.


  • TSU
    RDrive servo motors are EU/EC certified and comply with essential safety requirements for low-voltage devices and electromagnetic compatibility. Assessments are based on the EN 61800-5-1:2007/A1:2017, EN 61800-3:2004/A1:2012 harmonized standards. As a result, RDrive servos are proved to conform to the following EC/EU New Approach Directives: 2014/35/EU Low Voltage Directive 2014/30/EU EMC Directive assets/images/certification/odsts-19817.jpg