Integrated-motor actuator
SEW-EURODRIVE CMSB / CMS electric cylinders integrated-motor actuator
Servo electric cylinders with integrated ball screw or planetary roller screw, sizes 50 to 71, giving continuous feed forces up to 10,000 N, peak forces up to 24,000 N and strokes up to 1,200 mm (series maxima).
Key specifications
| Peak force (max) | 24,000 N |
|---|---|
| Continuous force (max) | 10,000 N |
| Stroke (max) | 1,200 mm |
| Linear speed (max) | 500 mm/s |
| Screw lead | 5, 6, 10 (KGT 20x5, 25x6, 32x6, 32x10; PGT 24x5) |
| Screw type | ball screw (KGT) or planetary roller screw (PGT 24x5) |
| Sizes | CMSB50S/M/L, CMSB63S/M, CMSB71S/M/L (oil bath); CMS71L (grease) |
Summarised in our own words from SEW-EURODRIVE GmbH & Co KG's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Max speed 500 mm/s is the CMS71L with KGT 32x10; CMSB versions are 375-450 mm/s. IP rating not stated.
Specify Motion is not affiliated with SEW-EURODRIVE GmbH & Co KG. SEW-EURODRIVE and CMSB / CMS electric cylinders are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a SEW-EURODRIVE part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These 3 series from our supply network are the closest match on published figures.
Rod actuator with a built-in servo motor driving a ball or roller screw, in four sizes up to 30.6 kN, offered in white food-grade and black heavy-duty finishes.
| Published maximum | CMSB / CMS electric cylinders | IMA Integrated Motor Actuator |
|---|---|---|
| Force | 24,000 N | 30,600 N meets or exceeds |
| Stroke | 1,200 mm | 457 mm |
| Speed | 500 mm/s | 1,334 mm/s meets or exceeds |
All-316 stainless electric rod actuator with IP69K washdown rating and ball or roller screws, designed to hygienic guidelines for higher-force food, beverage and pharma tasks. Replaces the ERD22/25/30 hygienic sizes.
| Published maximum | CMSB / CMS electric cylinders | RSH Hygienic Rod Actuator |
|---|---|---|
| Force | 24,000 N | 35,330 N meets or exceeds |
| Stroke | 1,200 mm | 1,219 mm meets or exceeds |
| Speed | 500 mm/s | 500 mm/s meets or exceeds |
Heavy-duty version of the RSA rod actuator with roller-screw options, matched angular-contact bearings and larger motor mounts, reaching 58 kN on size 64.
| Published maximum | CMSB / CMS electric cylinders | RSA-HT (high thrust) |
|---|---|---|
| Force | 24,000 N | 58,000 N meets or exceeds |
| Stroke | 1,200 mm | 1,524 mm meets or exceeds |
| Speed | 500 mm/s | 3,124 mm/s meets or exceeds |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
What an integrated-motor actuator is
An integrated-motor actuator combines the servo motor and the screw in one body, often with the motor rotor driving the screw or nut directly instead of through a coupling or belt. Many use an inverted roller screw inside a hollow rotor for a very compact, stiff design. Some versions also integrate the servo drive and position controller, so the actuator needs only power and a command or fieldbus connection. The result is a shorter, sealed unit with fewer parts to align.
When engineers choose an integrated-motor actuator
Choose an integrated-motor actuator when space is tight, a clean sealed package is wanted, or decentralised control reduces cabinet size and cabling. It suits welding guns, robot cells and hygienic plant. The trade-offs are flexibility and service: the motor cannot be changed independently, thermal limits are shared and repairs may mean replacing the whole unit. A separate motor and actuator lets you change motor size or brand later and is often easier to source as spare parts.
How to specify the SEW-EURODRIVE CMSB / CMS electric cylinders
Send these with your enquiry and an engineer can confirm the right CMSB / CMS electric cylinders variant or an equivalent:
- Force, peak and continuous (N)
- Stroke (mm) and speed (mm/s)
- Supply voltage: mains AC or low-voltage DC (V)
- Control interface: analogue, pulse, Modbus or industrial Ethernet
- Feedback and absolute position needs
- Duty cycle and ambient temperature (°C)
- Sealing and cleaning requirements (IP code)
Common mistakes to avoid
- Overlooking heat build-up when motor and screw share one housing
- Assuming any drive will run it, when integrated units may need a matched drive
- Not checking cable routing and connector orientation on the machine
- Forgetting spare strategy when the whole unit is one part
SEW-EURODRIVE CMSB / CMS electric cylinders: frequently asked questions
What is the SEW-EURODRIVE CMSB / CMS electric cylinders?
Servo electric cylinders with integrated ball screw or planetary roller screw, sizes 50 to 71, giving continuous feed forces up to 10,000 N, peak forces up to 24,000 N and strokes up to 1,200 mm (series maxima). Published series figures include peak force 24,000 N, continuous force 10,000 N, stroke 1,200 mm, linear speed 500 mm/s. It is made by SEW-EURODRIVE GmbH & Co KG; Specify Motion can help source it or propose an equivalent.
Who makes the SEW-EURODRIVE CMSB / CMS electric cylinders?
The SEW-EURODRIVE CMSB / CMS electric cylinders is made by SEW-EURODRIVE (SEW-EURODRIVE GmbH & Co KG) and is listed here for engineers comparing options. Specify Motion is not affiliated with SEW-EURODRIVE GmbH & Co KG; brand names are used only to identify the product.
What is the peak force of the SEW-EURODRIVE CMSB / CMS electric cylinders?
The published series maximum peak force is 24,000 N. Individual models and sizes in the CMSB / CMS electric cylinders range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the SEW-EURODRIVE CMSB / CMS electric cylinders?
Yes. On published figures, Tolomatic IMA Integrated Motor Actuator and Tolomatic RSH Hygienic Rod Actuator are the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
What are the advantages of an integrated motor actuator?
Combining motor and screw removes couplings, belts and the alignment that goes with them, so the actuator is shorter, stiffer and easier to seal. Versions with built-in drives also reduce cabinet space and cable runs. The downside is less flexibility for changing motor size and a larger, more expensive spare part.
Can an integrated actuator be controlled from a PLC?
Yes. Versions with built-in drives typically accept analogue, pulse and direction, discrete I/O or industrial Ethernet commands from a PLC. Versions without a drive need a compatible servo drive, often from a matched range. State the controller and network protocol at the outset so the right variant is selected.
Further reading: How to select a linear actuator · Ball screw vs roller screw · Linear actuators
Other integrated-motor actuator series
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