When most people think about industrial valves and process control, the first thing that comes to mind is the valve itself—whether it’s a gate valve, ball valve, or butterfly valve regulating flow in pipelines, power plants, water treatment facilities, or chemical processing units. But anyone who’s ever had to fix a stuck valve or adjust flow under pressure knows the real workhorse is the actuator behind it. As a supplier of AUMA Electric Actuators, I’ve spent years answering questions from plant managers, maintenance technicians, and engineers about why AUMA actuators stand out in crowded industrial markets, and one of the most common questions is also one of the most important: What motor type powers AUMA’s electric actuators? AUMA Electric Actuator
I get it—when you’re focused on getting a valve to open or close reliably 10,000 times a year, motor type might feel like a niche detail. But over the years, I’ve seen firsthand how the right motor can mean the difference between a valve that runs smoothly for 10 years with almost no downtime and one that requires weekly maintenance, leading to unplanned shutdowns, lost production, and safety risks. That’s why I want to break down exactly what motor AUMA uses in their electric actuators, why they chose that design over alternatives, and how it makes AUMA actuators a trusted choice for industries around the world.
First, let’s set a quick context: AUMA is one of the few actuator manufacturers that designs and builds almost every component of their electric actuators in-house, including their motors. That’s a big deal. A lot of competitors source generic off-the-shelf motors from third-party suppliers, which can lead to compatibility issues, performance gaps, and inconsistent quality. AUMA’s team of electrical engineers doesn’t just pick a motor off a catalog—they develop custom motors tailored specifically for the unique demands of valve actuation. So when you’re looking at an AUMA electric actuator, you’re not getting a generic motor shoehorned into a custom housing; you’re getting a motor engineered to work in perfect harmony with the actuator’s gearbox, control unit, and sensor system.
Now, to the core question: The primary motor used in AUMA’s standard range of electric actuators is a three-phase asynchronous induction motor—often referred to as an AC induction motor—for most of their general-purpose models. But that’s not the whole story; they also offer a range of specialized motor designs for extreme applications, like single-phase motors for small actuators, DC motors for battery-powered or low-voltage setups, and even gear-integrated motor designs for compact, high-torque units. Let’s start with the workhorse three-phase AC induction motor, because that’s what powers the vast majority of AUMA actuators sold globally, and why it’s such a smart choice for valve actuation.
Why three-phase AC induction motors? Let’s break down the advantages that matter most for industrial valve applications. First, reliability. Industrial actuators operate in some of the harshest environments on the planet—think oil refineries where temperatures swing from -40°C to 60°C, or water treatment plants with high humidity and corrosive chemicals, or offshore platforms exposed to salt spray and extreme vibration. AC induction motors have far fewer moving parts than other motor types, like brushed DC motors, which means fewer components that can wear out or fail. They don’t have brushes that need replacing every few thousand operating hours, which is a huge plus for applications where actuators are hard to reach—like valves on top of pipelines in remote locations. I’ve had customers tell me that replacing brushes on a DC motor actuator meant renting a lift, sending a technician to a height of 50 feet, and spending half a day on a job that could have been avoided. With AUMA’s induction motors, that kind of scheduled maintenance is almost non-existent.
Second, torque characteristics. Valve actuation isn’t just about spinning a shaft—it’s about overcoming the resistance of a valve disc pressing against a seat, especially when a valve has been closed for months or when it’s handling viscous fluids. AC induction motors produce high starting torque, which is critical for breaking free a stuck valve that might have seized up from pressure or corrosion. AUMA’s induction motors are also designed to deliver constant torque over their operating speed range, so you don’t get a drop in power when the actuator is under load. That consistency is what prevents situations where an actuator tries to open a valve, only to stall halfway through because it doesn’t have enough torque. I’ve seen this go wrong for a customer once—they used a competitor’s actuator with a generic induction motor that stalled when trying to open a gate valve that had been closed for 3 years, leading to a 12-hour shutdown while they waited for a replacement actuator. Since switching to AUMA, that customer hasn’t had a single valve stall issue.
Another big advantage of AUMA’s three-phase induction motors is their energy efficiency. Modern industrial operations are under constant pressure to reduce energy costs, and AUMA’s motor designs meet strict efficiency standards, like IE3 and IE4, which are the highest tiers for industrial motors. Unlike older motor designs that waste a lot of energy as heat, AUMA’s induction motors convert almost all the electrical energy they use into mechanical power. That might sound like a small detail, but when you have hundreds of actuators running 24/7, the energy savings add up quickly. One of my power generation customers calculated that switching to AUMA actuators cut their annual energy costs for actuators alone by over $12,000—and that’s not a number to ignore in today’s tight profit margins.
But wait, three-phase motors require a three-phase power supply, which isn’t always available, especially for small actuators used in low-flow applications or remote sites. That’s where AUMA’s specialized motor designs come in. For their smaller actuators, typically those with torque outputs under 100 Nm, AUMA offers single-phase AC induction motors. They’ve refined this design to deliver almost the same performance as their three-phase models, even on a single-phase power supply, so you don’t have to compromise on reliability just because you don’t have three-phase power. For applications where power is even more limited—like offshore platforms, remote pipeline sites, or temporary installations—AUMA also offers DC motor options, including brushless DC (BLDC) motors for their compact modular actuators. BLDC motors combine the high efficiency of induction motors with the precise control of DC motors, making them perfect for battery-powered setups where energy conservation is critical.
What really sets AUMA’s motor design apart from the competition is how they integrate the motor with the rest of the actuator system. Most manufacturers sell motors as separate components, so the motor, gearbox, and control unit are designed by different teams and don’t always work well together. AUMA engineers their motors to work seamlessly with their own gearboxes— which are often planetary or worm gear designs, chosen for their durability and torque capacity—and their intelligent control units, which include features like overload protection, position feedback, and remote monitoring. For example, AUMA’s motor has built-in temperature sensors that prevent overheating, which is a common cause of motor failure in actuators that run continuously for long periods. The control unit uses data from these sensors to adjust motor speed and power output, extending the motor’s life and preventing damage. I can’t tell you how many customers have praised AUMA for the fact that their actuators almost never need a motor replacement—we’ve had actuators in the field for 20 years that are still running on their original motor.
Now, let’s talk about common misconceptions I hear from customers when they ask about motor types. A lot of people think that more complex motor designs mean better performance, but that’s not always the case. I’ve had engineers ask if AUMA should use servo motors for better control, but here’s the thing: servo motors are great for precision positioning in robotics, but they’re overkill for valve actuation. Valve actuators don’t need micro-precision the way a robot arm does; they need reliability, high torque, and long life, which is exactly what AUMA’s induction motor provides. Servo motors also require more maintenance, are more expensive to replace, and are more sensitive to environmental conditions—they’d be a bad fit for industrial valve applications that run 24/7 in harsh conditions.
Another misconception is that older motor designs are less efficient. AUMA’s induction motors are anything but old-fashioned—they’ve been continuously refined over the last 40 years, with new materials and design improvements that boost efficiency while keeping the reliability that made them popular in the first place. For example, AUMA uses high-grade copper windings in their motors, which have lower resistance than aluminum windings, reducing energy loss and extending motor life. They also use specialized insulation materials that can withstand high temperatures and exposure to chemicals, making the motors suitable for use in even the most corrosive environments, like chemical processing plants or pulp and paper mills.
Let’s also address real-world use cases to put this in perspective. Take a water treatment plant that needs to operate hundreds of actuators for control valves, sludge valves, and butterfly valves. These actuators need to run for 10+ years, with minimal downtime, and handle frequent starts and stops. AUMA’s three-phase induction motors are perfect here—they can handle thousands of start-stop cycles a year, have high torque for opening valves that are prone to clogging with debris, and are resistant to the high humidity and chemical exposure in the plant. I worked with a wastewater treatment plant in the Midwest a few years ago that had been using competitor actuators for years, with one actuator failing every month on average. After switching all their actuators to AUMA, they went 18 months with only one minor maintenance issue, and the motor on that actuator was still running strong.
Or take an offshore oil platform, where every piece of equipment has to meet strict safety standards, and downtime means millions of dollars in lost production. Offshore actuators are exposed to salt spray, high winds, extreme temperatures, and vibration, so reliability is non-negotiable. AUMA’s induction motors are certified for use in hazardous areas (ATEX, IECEx, CSA), and their sealed design protects the motor from salt and moisture. One of our offshore customers told me that an actuator motor failed on their platform during a peak production period, and the replacement part took 3 days to arrive because of weather delays. They calculated that if that had been an AUMA actuator, they would have had a spare motor on hand, and the replacement would have taken less than an hour, saving them over $2 million in lost production.
So, if you’re in the market for an electric actuator, whether you’re a plant engineer, maintenance manager, or procurement specialist, the motor type is a critical factor to consider. It’s not just a small component—it’s the heart of the actuator, and it determines how reliably your valve will perform, how much maintenance you’ll need to do, and how much energy you’ll spend over the life of the actuator. AUMA’s choice of three-phase AC induction motors as their primary motor type, combined with their specialized designs for single-phase and DC applications, is a deliberate one, built on decades of experience in industrial valve actuation. They didn’t pick a motor because it was cheap or trendy—they picked a motor that delivers the reliability, torque, efficiency, and durability that industrial applications need.
If you’re looking to upgrade your current actuators, or if you’re planning a new project and need reliable electric actuators, I’d be happy to walk you through the different motor options and help you find the right fit for your specific application. Whether you’re dealing with a harsh environment, limited power supply, or need actuators certified for hazardous areas, AUMA has a motor design that will meet your needs, backed by decades of engineering expertise and a global support network.
To learn more about AUMA Electric Actuators and find the right motor type for your valves, don’t hesitate to reach out and connect to discuss your specific requirements.
Valve Positioner Accessories References:
- AUMA GmbH & Co. KG. (2023). Electric Actuators: Motor and Drive Technology. Retrieved from official AUMA technical documentation library
- International Electrotechnical Commission (IEC). (2021). Efficiency Classes for Industrial Motors (IE Code) – IEC 60034-30-2
- Hydraulic Institute. (2022). Electric Actuator Selection Guide for Industrial Valve Applications
- ATEX Directive 2014/34/EU. (2020). Certification Requirements for Electrical Equipment in Hazardous Areas
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