How to select the right servo motor for your application - STOBER
1. Understand your duty cycle
The duty cycle defines how long and how often your motor runs under load. This affects both the thermal and mechanical load the motor must handle. Servo motors operating under continuous loads will require different cooling and sizing strategies compared to those with intermittent use.
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Key considerations:
- Continuous Duty (S1): Requires motors designed for sustained operation without overheating.
- Intermittent Duty (S5-S8): May allow for smaller or more efficient motor selection, but must account for peak loads and dwell time.
STOBER tip: Use our Servo Motor Configurator to simulate duty cycles and get motor recommendations based on thermal modeling and application data.
2. Assess your environment
Where and how the motor will be used can dramatically influence performance and longevity. Harsh environments require special attention to motor sealing, material selection, and ingress protection (IP) ratings.
Environmental factors include:
- Dust, moisture, or washdown conditions
- High or low ambient temperatures
- Food-grade or cleanroom applications
STOBER advantage: Our stainless steel servo motors and cLEAN System solutions are ideal for hygienic and washdown environments—especially in food, beverage, and pharmaceutical applications.
3. Calculate required torque
Torque is the force that turns your load—and if it’s undersized or overestimated, you risk inefficiency or mechanical failure. Evaluate both continuous torque and peak torque requirements based on your application’s load characteristics.
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Common torque considerations:
- Acceleration/deceleration requirements
- Load inertia
- Holding or braking torque needs
STOBER engineering support: We provide tools and expert guidance to accurately calculate torque profiles and select the ideal gearmotor and drive combination.
4. Match the right speed
Servo motors are designed for dynamic performance, but matching motor speed to your machine’s needs is crucial. Speed and torque often trade off, so choosing the right combination—possibly with a gear reducer—can optimize system performance.
Think about:
- Target operating speed range
- Required acceleration times
- Mechanical limitations of the driven system
STOBER gear solutions: Our planetary and helical gear units seamlessly integrate with STOBER servo motors, offering compact solutions for high-torque, low-speed applications.
Selecting the right servo motor is a strategic engineering decision—and STOBER makes it easier. With our wide range of modular drive components, expert support, and industry-specific solutions, you can confidently match the motor to your performance, environmental, and operational needs.
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Custom Options for Servo Drives and Servo Motors - Glentek
Operation from non-standard voltages
Our standard products are optimized to operate off of common VAC line voltages or their VDC equivalent. However, if you application demands a particular voltage, let us know, and we will design a drive tailored to that voltage.
Modifications to mechanical packages
The most common modifications are to the mounting hole pattern and mounting surface.
Compatibility with special feedback devices
Each of our lines of servo drives accept feedback from a variety of feedback devices. However, if you don’t see your device listed, please contact us with your device’s specifications. We are constantly adding compatibility to new devices and protocols and we are also willing to develop new technology to meet your needs.
Current loop bandwidth and PWM frequency
Each of our drives has a standard current loop bandwidth and PWM frequency. However, depending on the motor’s inductance, resistance, and the system’s inertia, that might not be the best choice. Let us know the details of your system, and we will tweak your drive to perform at its best.
Factory tuning of the mechanical assembly
Sometimes the best way to ensure peak performance is to send us a system to evaluate. Our experienced engineers and technicians will test, analyze, and tune the system to your specifications.
Modifications to communication protocols/control interfaces
In some cases, standard communication protocols/control interfaces are limiting. If additional data transmission or tweaks to the protocol are required, contact us with your requirements.
Point-to-point motion profiles without an external controller (Profile Generator feature)
If your application involves a single-axis and a point-to-point motion, Glentek’s Profile Generator feature could possibly work instead of a controller. The Profile Generator feature lets a user program a sequence of steps to be performed by the drive and also incorporates I/O as triggers.
Custom windings for specific BEMFs
Selecting the right motor for your application can be a balancing act between the required torque, speed, and available current from your drive. While we offer several different BEMFs for each frame size and stack length, we can design and build motors with a specific BEMF tailored to your application.
Shaft modifications
Our standard shafts are offered in a variety inch, metric, or NEMA sizes. Common modifications include specific diameters, lengths, tapers, threads, crossholes, or profiles. The standard material is alloy steel, which has been stress-relieved, hardened, and ground. However stainless steel can also be used.
Front flange modifications
Similar to shafts, our standard front flanges are offered in a variety of inch, metric, or NEMA sizes. That includes the pilot diameter, mounting holes and bolt circle pattern and the standard material is aluminum. All can be customized to the application, and steel or stainless steel can be used.
Connectors/leads
We offer several standard types of connectors and pinouts. If you need to use a connector that we do not offer, let us know the manufacturer and their part/model number. Pinouts can also be customized. Connectors/leads are typically located at the rear end of the motor, but they can be oriented straight out of the back, at a right angle, closer to the front flange, or even coming out of the front flange itself.
Feedback device selection
Standard feedback devices include incremental encoders, absolute encoders, Hall sensors, resolvers, and analog tachometers in a number of resolutions, voltages, and interfaces. If you need to use a feedback device that we do not offer, let us know the manufacturer and their part/model number. More likely than not, we will be able to incorporate it into a design.
Appearance
Our standard motors are painted with a rugged black paint, or for some of our larger frame size brushless motors, black anodized. If you would like a different color or coating process, let us know. Powder coating is also an option. If you would like to paint them yourself, we can just use a coat of primer.
Non-standard stack lengths
Each frame size motor comes in a number of different stack lengths. Intermediate stack lengths or smaller stack lengths may be possible. If you have strict length limitations let us know and we will find the best motor for your needs.
Additional sealing options
Except for GM series motors, all of our motors feature o-ring or gasket sealing between the various parts of the motor. Shaft seals are also standard for all but the smallest motors we offer. For motors with shaft seals, IP65 sealing is standard, for those without, IP54. However, there are other sealing options available, such as v-ring seals. On the opposite side of the spectrum, we have also designed motors that required extra cooling and venting.
Bearing selection