Siemens Motor Selection: How Fast Can a Linear Actuator Move?

Search for “motor siemens” or “siemens-motor” and you’ll get enough spec sheets to fill a literal warehouse. That’s not the hard part. The hard part is the same one I face as office administrator for a 200-person manufacturing company: someone hands me a broken motor or a half-written spec and says, “Make it work.”

I’ve been managing purchases since 2021, processing roughly 70 MRO orders a year across Siemens motors, motor starters, and motion components. I report to both operations and finance, which is a gentle way of saying I get blamed when things are both late and over budget.

The most important thing I’ve learned is that there is no single answer to “which motor should I buy” or “how fast can a linear actuator move.” It depends on what you’re actually trying to do.

In practice, requests fall into three buckets:

• Replacement: a Siemens motor failed and production is waiting.
• Motion: someone needs a high speed linear actuator or an electric actuator 12V, but the speed and force aren’t defined yet.
• Money: management wants a cheaper supplier or a faster return on an energy project.

Each situation calls for a different response. It’s basically a decision tree, and I’ll walk you through it.

How Fast Can a Linear Actuator Move, Really?

Let’s answer the question that probably brought you here. For a common electric actuator 12V—the kind used in dampers, gates, and light automation—I’d expect roughly 0.2 to 2 inches per second at a reasonable load. For a high speed linear actuator built around a servo or stepper motor and a ball screw, you can see 10 to 20 inches per second, but the load has to be light and the motion profile has to be forgiving.

If I remember correctly, the basic calculation is:

Speed (in/s) ≈ (screw lead in inches × motor speed in revolutions per minute) ÷ gear reduction ÷ 60

Change the screw lead or the load and the number changes completely. So the polite answer is: it depends. If a supplier gives you one number without asking about load, that’s a red flag.

Scenario 1: Replacing a Failed Siemens Motor

Most of my urgent orders are this one. A motor overheated, or it’s making a noise that sounds expensive, and someone hands me a photo of a nameplate. The instinct is to buy the closest frame size and get the machine running again. I get it. But a “close” motor is a project, not a part.

First, get the nameplate data. If you can’t photograph the motor, find the maintenance record. We had a $2,800 order come back wrong in 2023 because the frame size was copied down as “185” when it was actually a “180” frame. The mounting holes didn’t line up. That mistake was mine, and it stayed with me.

Then go to Siemens Industry Online Support and pull the current Siemens motor starter catalog PDF. As of April 2025, that portal is where Siemens publishes the up-to-date SIRIUS selection tables. The tables tell you which contactor and overload relay match the motor’s full-load current. If you’re in North America, check NEMA MG 1 frame dimensions too. A Siemens motor can be electrically correct but mechanically wrong.

One more thing: if the motor was on a VFD, confirm the replacement is inverter-rated. I once assumed an older motor would be fine with a VFD because someone told me it “had always been on the drive.” It hadn’t, and the rewind shop bill was more than a new inverter-duty motor. Actually, the rewind happened after the motor failed—or rather, after I replaced it with the wrong non-inverter-rated model. Trust me on this one: the data sheet matters.

Scenario 2: You Need a High Speed Linear Actuator

This is where phone calls start with, “I need a high speed linear actuator.” The next sentence is often “as fast as possible.” That tells me almost nothing. Fast for a keyboard switch is different from fast for a packaging machine.

Honestly, if you’re looking at an electric actuator 12V, understand the trade-off from the beginning. 12V systems are convenient for small machines and battery-powered equipment, but high speed at 12V means high current, and high current means a bigger controller and thicker cables. For genuinely fast moves, we usually end up with 24V DC, 48V DC, or AC servo systems.

A high speed linear actuator is really a system: a motor, a screw, a guide, a controller, and a feedback device. For a new machine, I would pair a Siemens servo motor with a quality ball-screw linear actuator. The servo drive handles the acceleration, the encoder gives position feedback, and the ball screw turns the motor’s rotation into thrust. It costs more than a simple 12V actuator, and it’s also a different category of equipment.

Here’s where I got burned. I asked a supplier for “high speed” with a load that was never clearly stated. They sent a heavy-duty unit with enormous force capacity and a top speed of maybe 2 in/s. I meant “move a small arm quickly.” They heard “push something heavy slowly.” We were using the same words but meaning different things. Discovered this during commissioning, which is the worst time to discover it.

For our own packaging line, we run a servo-driven actuator at about 12 in/s with a light load. That works because the stroke is short and the load is consistent. If you’re moving 50 kg against a seal, your speed will be lower. Different machine, different answer.

Scenario 3: Finance Wants a Cheaper “Equivalent”

This is the one that makes me defensive. The conventional wisdom says the lowest quote is the cheapest option. My experience says the quote is just the beginning. A cheaper motor with a generic spec sheet can look like the same thing and cost less. Finance isn’t wrong that the sticker price is lower. They’re just not seeing the other costs.

If the cheaper motor has a lower efficiency class, the extra electricity can eat up the price difference in a few years. If the duty cycle rating is lower, the motor overheats in service. If the documentation is missing, troubleshooting takes longer. None of that appears in the purchase order.

Siemens motors are documented under IEC 60034-30-1 efficiency classes and NEMA MG 1 standards. The data sheet shows a real efficiency curve, not a marketing number. I used to be skeptical of the premium until a vendor showed me the comparison. At 2,000 operating hours a year, the energy loss on a cheaper motor translated into real dollars. It wasn’t a no-brainer on day one, but it made the total cost picture much clearer.

The cheapest motor that fails during a production week isn’t cheaper. It’s a bill for a new motor, emergency labor, lost output, and an apologetic phone call to your customer.

That $200 savings turned into a $1,500 problem when the “equivalent” motor didn’t fit the existing starter enclosure. The vendor with the lowest price didn’t have a data sheet or a technical person available. Now I treat lack of documentation as a deal-breaker.

How To Tell Which Scenario You’re In

If you’re still on the fence, ask yourself what started the search:

• There’s a dead motor on the floor. Scenario 1. Get the nameplate, get the Siemens motor starter catalog PDF, and match the complete model—frame, voltage, speed, mounting, and inverter rating.
• You’re sketching out a machine or retrofit. Scenario 2. Define the load, stroke, speed, acceleration, voltage, and duty cycle before comparing a 12V electric actuator to a servo-driven high speed linear actuator.
• The request mentions energy savings or budget cuts. Scenario 3. Pull the efficiency curves and calculate total lifecycle cost.

My experience is based on a few hundred orders in a mid-size manufacturing company, not on every industry on earth. If you’re designing a custom automation system with safety-rated motions, an engineer should drive the calculation. But the purchasing logic is the same: define the problem, require real documentation, and compare the total cost.

Whether you landed here by typing “motor siemens” or “siemens-motor,” the buying decision is the same. The right answer isn’t whatever is cheapest or fastest in the search results. It’s the one that fits your machine, your application, and your downtime risk.

Trust me on this one: the supplier who asks about your application before quoting is worth more than the one who promises a low price and a fast ship date. The low price is the price to order. It’s never the price to own.