Leeson-Motor FAQ: 7 Questions Worth Asking Before You Specify

Before you scroll past another motor FAQ, here's why this one is different: I'm the person who reviews incoming motor shipments before they go into inventory. I've been doing that for about four years at a motion-control distributor. In 2024, I rejected roughly 7% of first deliveries due to spec mismatches—wrong frame sizes, missing certification docs, that sort of thing. These are the questions I think more buyers should ask, even when the quote already looks good.

• What does the Leeson-motor lineup actually include?
• Is a Leeson Washguard motor worth it if I'm not doing daily washdowns?
• What should I verify before I buy a Leeson 2hp motor?
• Why would I use a high torque servo motor instead of a stepper?
• Can I run an Arduino stepper motor with an industrial driver?
• Wait—what's a ball bearing, and why does it matter in a motor?
• How do I compare motor quotes without getting burned?

What does the Leeson-motor lineup actually include?

When you're looking at a Leeson-motor part number, the brand covers more than the generic AC motor you might picture. The product line includes AC induction motors, DC motors, servo motors, stepper motors, gearmotors, and accessories—drives and linear actuators included under the broader Regal Rexnord umbrella. Why does this matter? Because a Leeson motor alone doesn't tell you what you're specifying. A Leeson 2hp motor with a TEFC enclosure is not the same as a Leeson Washguard motor with a sealed conduit box, even if both are rated 2 hp. From the outside, they look similar. The reality is that enclosure, insulation, and bearing protection determine whether the motor survives its environment. I've rejected motors because the internals didn't match the datasheet—so it's worth checking the full model number, not just the horsepower. The model number also tells you about mounting, duty rating, and bearing setup. I've seen two motors with the same horsepower and different base dimensions, so the motor didn't line up with the existing pump. That's a classic total cost trap: the part fits on paper, but not on the machine.

Is a Leeson Washguard motor worth it if I'm not doing daily washdowns?

If the motor is in a damp area or gets sprayed down even occasionally, the Washguard version is often worth it—but I want you to think about why. It's not just epoxy paint. Washguard motors typically include sealed conduit boxes, stainless steel hardware, and a more robust sealing system against water ingress. That costs more upfront. From a total cost perspective, the premium is usually smaller than one emergency replacement plus the production time you lose. In Q3 2024, I reviewed a washdown motor failure that took out a packaging line for six hours. The replacement motor was around $400; the downtime was roughly $4,800. That's the kind of math I use before recommending a Washguard. The premium is usually modest compared to a standard TEFC motor, especially on smaller frames. It also keeps water out of the junction box, which is where I've seen more failures than in the motor itself. If the environment is clean and climate-controlled, a standard Leeson motor can be the right call. Just remember: Washguard is rated for washdown, not submersion.

What should I verify before I buy a Leeson 2hp motor?

The 2 hp spec is just the beginning. I check four things on every order. One: frame size, using NEMA MG 1 nomenclature—frame 56, 143T, or 145T? That determines mounting dimensions. Two: enclosure—TEFC, ODP, or Washguard. Three: voltage and phase—single-phase 115/230 or three-phase 208-230/460? A motor wired for the wrong voltage will run, but not for long. Four: service factor—if your load spikes, a 1.15 service factor gives you a little more headroom before the motor overheats. And match the duty cycle: continuous vs. intermittent. I once specified a 2 hp motor with an inadequate service factor for a conveyor that ran 16 hours a day. It failed in eleven months. The replacement was more expensive, but the cost per operating hour was actually lower. That's the thing: the cheapest quote is not the cheapest motor if it can't do the job.

Why would I use a high torque servo motor instead of a stepper?

I went back and forth on this exact question for a retrofit project in 2023. A stepper motor is open-loop: it takes steps and assumes it didn't miss any. A servo motor is closed-loop: it uses an encoder to confirm position and correct errors. A high torque servo motor is the right choice when you need torque at higher speeds, holding torque against a varying load, or precise positioning without missed steps. Steppers are simpler and cheaper to set up, and they've gotten a lot better over the last decade—the old 'steppers are weak' thinking comes from an era of weak drivers. But if your load changes or the machine needs to jog quickly, a servo often wins on total cost, because fewer rejected parts and less downtime pay for the difference. Steppers also hold full current at standstill to maintain position, which makes them run hot. Servo current drops to near zero once the move is done. People miss that detail until the enclosure gets warm. For a fixed, low-speed indexing application, a stepper is probably fine. At least, that's been my experience with packaging machines that run the same cycle all day.

Can I run an Arduino stepper motor with an industrial driver?

Let's separate two terms. An Arduino stepper motor, in most hobby write-ups, is a small NEMA 17 or NEMA 23 stepper with a driver board like an A4988. That's not the same as an industrial stepper, which may be NEMA 34 or larger and need a much higher voltage driver. You can use an Arduino to generate step and direction pulses for an industrial stepper driver—I've done that for bench testing—but you can't wire the Arduino directly to the motor. The Arduino can't deliver the current. Industrial stepper motors often run at 24-70 VDC or more, which is not breadboard friendly. If you're building a hobby project, buy a hobby stepper kit and skip the industrial motor. If you need a motor for a real machine, budget for the driver, wiring, and safety circuitry. That's where total cost thinking starts.

Wait—what's a ball bearing, and why does it matter in a motor?

A ball bearing is a set of steel balls held between two rings, called races, that lets a shaft spin with much less friction than sliding directly on metal. In an electric motor, the ball bearing supports the rotor and keeps the air gap between rotor and stator even. If the bearing is bad, you feel roughness when you turn the shaft by hand—or worse, you hear it later as noise and vibration. For motor spec, bearing type matters: sealed bearings are greased for life and keep contaminants out; shielded bearings have slightly less drag but also less protection. Washguard motors often use sealed bearings and an extra shaft seal, because water is the enemy of bearing grease. I've rejected motors before installation (ugh) because the shaft felt grainy when rotated. The bearing is a small part, but it's often the first thing to fail. So what's a ball bearing? It's one of the smartest questions you can ask.

How do I compare motor quotes without getting burned?

Start with TCO: total cost of ownership, not the line item price. On every quote, write down base motor price, shipping, installation labor, expected life, and the cost of downtime if the motor fails. The quote that says Leeson 2hp motor at $550 and a quote at $620 might look different—but if the $620 includes a longer warranty, better shipping, or a spec review before order, the $620 can be cheaper over the life of the machine. I do not mean always spend more. I mean track the assumptions. For example, a motor with a 1.15 service factor might cost 8% more but last longer in a borderline load. As of January 2025, I'm seeing more buyers ask for documented service factor and origin on every quote. That's a good trend. And look at efficiency, too. A slightly more efficient motor can save a few hundred dollars in electricity over its life, but that only shows up if you compare efficiency ratings on the quote. Oh, and get the warranty terms in writing. The goal isn't to avoid expenses—it's to avoid surprise expenses.