Round the corner at full force: Right-angle planetary servo geared motors.
A high-precision right-angle planetary gearbox for small installation spaces, combined with an extremely compact, dynamic synchronous servo motor.
Our right-angle planetary servo geared motors – for high demands on smooth operation, efficiency and service life.
- Right-angle planetary gearbox with EZ motor
- PKEZ: For high precision
- PKXEZ: High precision for small installation spaces
- PHKEZ: For high performance
- PHKXEZ: High performance for small installation spaces
- PHQKEZ: Quattro Power for a high power density
If the coaxial design of a motor forms interference contours, the STOBER planetary gearbox combined with a helical bevel geared motor is the ideal solution to meet the highest demands in terms of dynamics, backlash stability and ruggedness.
You get a precise right-angle servo gearbox – even for tight installation spaces – combined with an extremely compact, highly dynamic synchronous servo motor.
The PK series consists of precise right-angle servo gearboxes with high-quality helical gearing – for exceptional backlash stability. And for large gear ratios.
When the PK series is combined with our extremely compact, highly dynamic EZ motor, the result is a precise right-angle servo geared motor featuring a high torsional stiffness and backlash stability!
The PKX gearbox series is the compact variant of the PK series. Just as precise and also featuring high-quality helical gearing, it is extraordinarily stable against backlash and perfect for tight installation spaces.
When combined with an EZ motor, the result is a very compact, highly dynamic drive unit with a right-angle gearbox and rugged planetary output stage – and without any offset.
The PHK gearbox series stands for high-performance right-angle servo gearboxes with high-quality helical gearing and very high torsional and tilting stiffness.
Compared to the PHKX series, the PHK gearboxes are ideal for larger gear ratios!
With the combination of PHK and an EZ motor, you get a dynamic, highly rigid drive unit consisting of a pre-mounted right-angle gearbox and a ruggedly mounted planetary output stage featuring high torque.
The PHKX series is the compact variant of the PHK gearbox series. With just as much torsional and tilting stiffness, it is absolutely powerful with high-quality helical gearing and perfect for tight installation spaces.
When attached to an EZ motor, the result is an extremely compact right-angle geared motor with maximum volume performance, exceptional synchronism and high torque.
PHQK: An innovative 4-planet right-angle servo gearbox with high-quality helical gearing and very high torsional and tilting stiffness.
The same is true for the Quattro Power gearbox – it is ideal for large gear ratios.
And when it’s combined with an EZ motor, you get a geared motor with outstanding precision, very high performance, and very low backlash.
Power density
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- Total ratio: 12 – 555
- Allowed acceleration torque: 68 – 3105 Nm
- Backlash: 1.5 – 5 arcmin
- Efficiency: 94%
Find your right fit!
Power density
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- Total ratio: 3 – 300
- Allowed acceleration torque: 11 – 3300 Nm
- Backlash: 2 – 8.5 arcmin
- Efficiency: 94 – 96%
Find your right fit!
Power density
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- Total ratio: 16 – 555
- Allowed acceleration torque: 89 – 7500 Nm
- Backlash: 1.5 – 4.5 arcmin
- Efficiency: 92 – 93%
Find your right fit!
Power density
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- Total ratio: 4 – 300
- Allowed acceleration torque: 26 – 2100 Nm
- Backlash: 1 – 6 arcmin
- Efficiency: 92 – 95%
Find your right fit!
Power density
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- Total ratio: 22 – 2242
- Allowed acceleration torque: 123 – 43000 Nm
- Backlash: 1.5 – 4 arcmin
- Efficiency: 90 – 93%
Find your right fit!
- To the features of PK gearboxes
- To the features of EZ motors
- To the features of PKX gearboxes
- To the features of EZ motors
- To the features of PHK gearboxes
- To the features of EZ motors
- To the features of PHKX gearboxes
- To the features of EZ motors
- To the features of PHQK gearboxes
- To the features of EZ motors
We get your visions moving – in various industries and markets worldwide.
Using a holistic approach for your specific task, we support you with precisely tailored solutions for drives and automation.
Learn moreWe get your visions moving – in various industries and markets worldwide.
Using a holistic approach for your specific task, we support you with precisely tailored solutions for drives and automation.
Learn moreWe get your visions moving – in various industries and markets worldwide.
Using a holistic approach for your specific task, we support you with precisely tailored solutions for drives and automation.
Learn moreWe get your visions moving – in various industries and markets worldwide.
Using a holistic approach for your specific task, we support you with precisely tailored solutions for drives and automation.
Learn moreWe get your visions moving – in various industries and markets worldwide.
Using a holistic approach for your specific task, we support you with precisely tailored solutions for drives and automation.
Learn more| Title | Version | ID | Date | Language | Size / Type | |
|---|---|---|---|---|---|---|
 | Catalog Synchronous servo geared motors EZ | 14 | 442437 | 2025 03 | EN | 24.13 MB |
 | Catalog STOBER compact | 06 | 442655 | 2024 10 | EN | 9.76 MB |
 | Catalog Synchronous servo geared motors with redundant brake | 02 | 443311 | 2024 09 | EN | 17.32 MB |
 | More than just a gearbox | 00 | 443157 | 2019 10 | EN | 1014.67 KB |
| Title | Version | ID | Date | Language | Size / Type | |
|---|---|---|---|---|---|---|
 | Operating manual P23KX - P93KX gear units and geared motors | 00 | 443361 | 2023 07 | EN | 2.10 MB |
 | Operating manual P53K - P93K gear units and geared motors | 00 | 443360 | 2023 07 | EN | 1.75 MB |
 | Operating manual PH33KX-PH83KX PH94KX-PH104KX gear units geared motors | 00 | 443359 | 2023 02 | EN | 2.21 MB |
 | Operating manual PH53K-PH83K PH94K-PH104K gear units geared motors | 00 | 443358 | 2023 02 | EN | 1.92 MB |
 | Operating manual PHQ53K-PHQ83K PHQ94K-PHQ124K gear units geared motors | 00 | 443357 | 2023 02 | EN | 4.13 MB |
 | Safety instructions for synchronous servo motors synchronous servo geared motors | 00 | 443104 | 2018 07 | EN | 74.66 KB |
 | Operating manual EZ EZHD EZHP EZS EZM synchronous servo motors | 01 | 443032 | 2019 05 | EN | 441.75 KB |
| Title | Version | ID | Date | Language | Size / Type | |
|---|---|---|---|---|---|---|
 | Lubricant fill volume | 17 | 441871 | 2023 10 | EN | 2.18 MB |
| Title | Version | ID | Date | Language | Size / Type | |
|---|---|---|---|---|---|---|
 | Certificate Free of CCC | 35 | 442072 | 2025 04 | EN | 261.03 KB |
 | EU declaration of conformity synchronous servo motors and synchronous geared motors ED EK EZ | 02 | 443089 | 2024 03 | EN | 73.57 KB |
 | UK declaration of conformity synchronous servo motors and synchronous servo geared motors EZ ED EK LM | 00 | 443297 | 2021 10 | EN | 71.46 KB |
 | Certificate UL - cURus synchronous servomotors EZ EZS EZM EZHD EZHP | 00 | 443097 | 2016 12 | EN | 1.44 MB |
Take advantage of the expertise of our application engineers in the Sales Centers or contact our first level support.
OPENsystemsupport@stoeber.de
With SERVOsoft®, you have a tool at your fingertips that lets you design your drive systems with precise scaling in just a few steps. Electrical as well as mechanical design, and simple and fast at the same time.
OPENWith the intuitive STOBER product configurator, you can filter, compare, save and share the right drive solutions with ease.
OPENAre you looking for CAD data? With the STOBER CAD tool, the drawings you need are ready for download in just a few clicks.
OPENSTOBER is present in over 40 countries worldwide with 12 subsidiaries and 80 service partners. No matter where, no matter when, we’re always at your service and on the move!
OPENDo you need competent help with replacement parts, replacement drives, repairs and retrofitting? Feel free to contact us! We also offer a 24-hour hotline for urgent cases.
OPENOne partner. All the possibilities.
Get the benefits of precise, practical system solutions for drives and automation with uncompromising quality and expert individual consultation.
Need special solutions?
Our product portfolio is modular and freely scalable, offering a very wide range of combination options. A drive system for custom-fit, compact machine concepts. With the option to make adjustments to fit the project.
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