AC servo motor
WITTENSTEIN alpha cyber power motor
High-performance synchronous servo motor platform from 22 to 480 mm, available housed or frameless, convection or liquid cooled.
Key specifications
| Outer diameter | 22–480 mm |
|---|---|
| Ingress protection | up to IP6K9K (option) |
| Peak torque (max) | 1,000 Nm |
| Speed (max) | 18,000 rpm |
| Power (max) | 102,000 W |
| Supply | 560 Vdc |
| Feedback | all common encoder systems |
Summarised in our own words from WITTENSTEIN SE's published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2
Notes on this data
Max torque 0.02-1000 Nm; max power 6 kW (size 064) to 102 kW (size 220). 18,000 rpm is the corner speed of size 064, not a stated max speed. Sub-families AM/AML/AMW (1-430 Nm) and AF/AFW (12.3-556 Nm) listed separately.
Specify Motion is not affiliated with WITTENSTEIN SE. WITTENSTEIN alpha and cyber power motor are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Engineer support
Speak to our engineers about your project
Our experienced engineers are on hand, ready to help with your project. Whether you need the WITTENSTEIN alpha cyber power motor itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
- Help sourcing cyber power motor and spares for installed machines
- Modified and custom designs when a catalogue part doesn't fit
- Complete axis: motor, drive, gearing and feedback matched together
What an AC servo motor is
An AC servo motor is a permanent-magnet synchronous motor designed for closed-loop control of position, speed and torque. A wound stator is driven by a servo drive with sinusoidal three-phase current, while magnets on the rotor follow the rotating field. A high-resolution encoder or resolver on the shaft feeds position back to the drive, which adjusts current many thousands of times a second. The result is precise, dynamic motion with high peak torque, typically about three times the continuous rating for short periods.
When engineers choose an AC servo motor
Choose an AC servo for machine axes needing fast, accurate motion under varying loads, such as packaging, robotics, machine tools and printing. Compared with steppers, servos keep torque at high speed and cannot silently lose position. The trade-offs are cost and set-up: a servo needs a matched drive, feedback and tuning. For simple, low-speed indexing with a steady load, a stepper may be cheaper. For very low speeds and high torque, a gearbox or direct-drive motor may be needed.
How to specify the WITTENSTEIN alpha cyber power motor
Send these with your enquiry and an engineer can confirm the right cyber power motor variant or an equivalent:
- Continuous and peak torque (Nm)
- Rated and maximum speed (rpm)
- Load inertia and inertia ratio
- Supply voltage: 230 V single-phase or 400 V three-phase
- Feedback: incremental or absolute encoder, resolution (bits)
- Holding brake, IP code and shaft options
- Flange size and mounting (mm)
Common mistakes to avoid
- Sizing on peak torque without checking RMS torque over the cycle
- Ignoring load-to-motor inertia ratio, which makes tuning hard
- Forgetting the brake is for holding, not dynamic stopping
- Using a motor and drive pair that the supplier has not matched
WITTENSTEIN alpha cyber power motor: frequently asked questions
What is the WITTENSTEIN alpha cyber power motor?
High-performance synchronous servo motor platform from 22 to 480 mm, available housed or frameless, convection or liquid cooled. Published series figures include outer diameter 22 mm, outer diameter 480 mm, peak torque 1,000 Nm, speed 18,000 rpm. It is made by WITTENSTEIN SE; Specify Motion can help source it or propose an equivalent.
Who makes the WITTENSTEIN alpha cyber power motor?
The WITTENSTEIN alpha cyber power motor is made by WITTENSTEIN alpha (WITTENSTEIN SE) and is listed here for engineers comparing options. Specify Motion is not affiliated with WITTENSTEIN SE; brand names are used only to identify the product.
What is the outer diameter of the WITTENSTEIN alpha cyber power motor?
The published series minimum outer diameter is 22 mm. Individual models and sizes in the cyber power motor 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 WITTENSTEIN alpha cyber power motor?
Yes. Our engineers can propose an equivalent built around your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
What is the inertia ratio in servo sizing?
The inertia ratio compares the load inertia reflected to the motor shaft with the motor's rotor inertia. High ratios make the axis harder to tune and slower to settle. Many engineers aim for below about 10:1, and lower for highly dynamic axes, using a gearbox to reduce reflected inertia where needed.
Do AC servo motors need an absolute encoder?
Not always. Incremental encoders need a homing routine after power-up, which is acceptable on many machines. Absolute encoders know their position at power-on, avoiding homing, which saves time and suits robots and multi-axis machines. Multi-turn absolute encoders track turns even when power is off.
Further reading: How to select a servo motor · Servo vs stepper · Servo and stepper motors
Other ac servo motor series
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Tell us about your project and how you use the WITTENSTEIN alpha cyber power motor: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
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