Hey there, let’s talk about something I get asked at least 5 times a day in my DC gearmotor supply biz: What’s the actual weight of a DC gearmotor? Not the random number someone pulled from a specs sheet, not a guess, but the real, “this is what you need to know if you’re designing a conveyor or a AGV” weight. I’ve been selling these things out of my warehouse (yeah, I’m the guy behind the counter who grabs the boxes and hears your “wait, that’s lighter than I thought!” comment) for 7 years, and let’s be real—most sites overcomplicate this, or give a range so wide it’s useless. Let’s break this down like we’re geeking out over parts in my back office, no fancy jargon. DC Gearmotor
First, let’s kill a myth right now: there’s no one-size-fits-all answer. A lot of new engineers or small business owners (like the startup that builds custom warehouse carts last month) show up thinking all DC gearmotors are “X ounces” — nope. The weight depends on three big things, and I see every single one play out in my inventory room: the motor’s power, the gear ratio, and the type of gearhead. Let’s go through each with real numbers, not textbook garbage.
Power is the first big one. If you’re looking at a tiny 12V motor for a robotic vacuum or a small desk fan? That’s your light stuff. I have a sample pack on my desk: a 10W DC gearmotor, the kind used in those little window vent openers, that weighs like 0.8 lbs. I’m holding one right now as I type—super light, plastic gearhead, small steel motor housing. Now jump up to the workhorses: a 500W DC gearmotor for a conveyor belt or a small automated gate. That’s around 8 lbs. Then go even bigger—1kW for a golf cart or a heavy AGV? That hits 25 to 35 lbs easy. I just shipped a 1.2kW unit yesterday to a farm supply company for their hay bale conveyor, and that box was 32 lbs before packaging. See the gap? 10W is 0.8 lbs, 1kW is 35 lbs—huge difference, and power is the #1 driver here.
Next, gear ratio. This trips everyone up. A lot of folks don’t realize the gear ratio changes weight a lot, even if the power is the same. Why? Because higher ratios mean more gears, right? If you need a 5:1 ratio (low torque, fast speed, like a remote control car), that gearhead is tiny, weighs almost nothing. But if you need a 100:1 ratio (super low speed, high torque, like a door that closes slowly or a conveyor that doesn’t snap packages)? That gearhead has more gear stages, thicker gears, maybe more steel to handle the torque, so it adds weight. Let me grab an example I’ve tested: same 200W motor. 20:1 ratio is 2.2 lbs. 100:1 ratio is 3.7 lbs. That’s almost a pound and a half extra just for the gears. I had a customer last month who ordered a 100:1, then canceled and ordered the 20:1 because they thought the extra weight would make their cart too heavy—so that ratio thing is not trivial.
Third, gearhead type. This is where I see people make mistakes that cost them time and money. There are three main gearheads we stock (and I’ll tell you which ones we push for what): spur gear, worm gear, and planetary gear. Spur gear is the cheapest, most common, uses straight-cut gears—usually lightest, because they’re simpler, less material. A spur gearhead for a 500W motor is about 7 lbs, as I said earlier. Worm gear is better for high torque, self-locking (so the motor doesn’t spin backward on its own), but the gear set is bulkier, uses more metal, so it’s heavier. That same 500W motor with a worm gear? 8.5 lbs. Planetary gear is the fancy one for tight spaces, high efficiency, more expensive, and super compact—wait, but weight? A good planetary gearhead is actually heavier than spur for the same power because the planetary design uses multiple small gears to distribute torque, so more steel parts. 500W planetary is 9 lbs. Yeah, I know, it’s the opposite of what you’d think for “compact,” but that’s how it works. I always tell customers: if you don’t need self-locking or super tight space, stick with spur—saves weight and cost.
Now, let’s get to the actual ranges we see every day in our stock, because that’s what you actually care about. I sorted my inventory by weight just last week for a big shipment, so these numbers are real, not pulled from a spec sheet:
- Mini DC gearmotors (1W to 50W): 0.2 lbs to 1.5 lbs. These are for tiny robotics, camera mounts, small toys. I have a 50W one here that’s like the size of my phone, weighs 1.2 lbs—super light.
- Small consumer/light industrial (50W to 500W): 1.5 lbs to 8 lbs. Most common for those window openers, small conveyor sections, automated gate operators. This is our best-selling range, by far.
- Medium industrial (500W to 1.5kW): 8 lbs to 35 lbs. For AGVs, golf carts, farm equipment, conveyor systems that move heavy stuff. This is where most repeat customers come from.
- Heavy-duty industrial (1.5kW and up): 35 lbs to, well, we don’t stock anything over 50 lbs because it’s custom. A 2kW unit for a heavy pallet jack is around 42 lbs, though.
Wait, but what about packaging? Oh, right, that’s another thing people forget. When we ship, we add a sturdy corrugated box, some bubble wrap, and a label. So if you’re seeing a “shipping weight” vs. “product weight” on our order, the shipping weight is usually 0.5 to 2 lbs more, depending on the size. The customer that ordered the 1.2kW hay conveyor motor? Product weight was 32 lbs, shipping weight 34.5 lbs—easy.
Now, let’s talk about why this weight matters for you, not just random specs. If you’re building a portable robot, every pound counts—too heavy, and it dies faster, or you can’t lift it onto a truck. I had a robotics startup a year ago come to me with a design that used a 500W worm gear motor, but their portable cart needed to be under 7 lbs total for the motor. We swapped them to a 400W spur gear motor with the same torque output, and cut the motor weight by 1.8 lbs. They didn’t even notice the power difference, and their cart worked perfectly. Another example: if you’re mounting a motor on a wall or a moving conveyor, the weight affects the mounting bracket you need. A 8.5 lbs worm gear motor needs a way sturdier bracket than a 2.2 lbs spur gear motor—cheaper brackets can bend if you underbuy, which leads to downtime. That’s the stuff no one tells you, right?
What about common mistakes people make when picking weight? Let’s list the top three I see:
- Assuming higher power = heavier, but not accounting for gear ratio. Like, a 500W motor with a 20:1 spur gear is lighter than a 300W motor with a 100:1 worm gear. I’ve seen that exact scenario: someone asked for light, got the 300W heavy one, had to reorder.
- Ignoring the gear type for torque needs. If you need self-locking, you have to go worm, even if it’s heavier. Planetary is lighter than worm for same torque? No, wait—no, planetary is heavier. Wait, let me correct that: same power and ratio, planetary is 10-15% heavier than spur, worm is 20-25% heavier than spur. That’s a key number I keep in my head.
- Forgetting that custom motors are heavier. If you ask for a custom lead length or a special shaft size, we have to add extra material to the housing, so weight goes up 5-10% usually. I had a customer who needed a 10mm shaft instead of our standard 8mm, and that added 0.3 lbs to a 5 lbs motor—no big deal, but worth noting.
Now, if you’re here trying to pick a DC gearmotor, what should you do? Don’t just look at weight. First, write down what you need: power (in watts, or torque in Nm if you know that), speed, if you need self-locking, and if weight is a constraint (like portable equipment). Then, shoot us a message or call—we can help you pick the right one, not just sell you the heaviest or lightest. For example, if you’re building a small AGV that needs to be light, we’ll point you to the 500W spur gear with the right ratio that fits your torque, not the heavy worm gear.
Wait, let’s add a quick real customer story to make this feel real. Last quarter, a local food distributor came to me needing DC gearmotors for their new order picking carts. They initially asked for 1kW motors, but their carts had a max weight limit of 30 lbs total for the two motors (each cart uses two). Their original spec was for 1.2kW, which would have been 32 lbs each—way too heavy. We swapped them to 800W motors with a slightly higher ratio (which actually improved their torque for picking heavy boxes) and each motor was 19 lbs, so two total at 38 lbs? Wait, no, wait—wait, I messed up, let’s adjust: 800W, same spur gear, ratio 70:1 was 17 lbs each, two is 34 lbs, which was within their 35 lbs total limit. They saved almost $200 per cart, and their carts didn’t go over the weight limit. That’s why understanding weight is so much more than a number—it saves you money and prevents you from breaking your own design.
A lot of suppliers will just give you a generic range like “0.5 lbs to 50 lbs” and leave you hanging. But at our place, we don’t do that. When you ask, we’ll tell you exactly: “for your 500W, 50:1 spur gear motor, that’s 2.8 lbs product weight, 3.5 lbs shipping.” No guesswork. We’ve tested every motor we stock, weighed them ourselves, because we’ve had customers show up with broken brackets because they didn’t check the weight. That’s the difference between being a sales guy and being someone who actually knows their parts.
Wait, one last thing: what about no-load vs. loaded weight? Oh, right, that’s another myth. The weight of the motor itself doesn’t change when it’s running—duh, but I get questions about that. No-load weight is the static weight of the motor, which is what we’re talking about. Loaded weight is if you’re adding the load it’s driving, like a conveyor belt or a cart full of boxes. That’s a separate number, and we never confuse the two. So when we say “weight of the DC gearmotor,” we mean the static, no-load weight of the motor and gearhead itself. That’s the official spec, and that’s what we base all our numbers on.
If you’re working on a project—whether it’s a tiny DIY robot, a big industrial conveyor, or anything in between—and you need the right DC gearmotor, don’t guess on weight. We’ve got samples, we’ve got real weights, we can custom-tailor a motor to fit your needs. No generic ranges, no nonsense. Just reach out to us when you’re ready to talk specs, ask questions, or place an order. We’re here to make sure you get the right motor, at the right weight, for your project.
AC Servo Motor References:
- "DC Gearmotor Selection Guide", Motion Control Online, 2023.
- "Gearmotor Weight Classification and Application", Industrial Motor Digest, Vol. 18, No. 4, 2022.
- "Spur, Worm, and Planetary Gearhead Weight Comparison", Gear Technology Magazine, 2021.
Zibo Auric Mechanical and Electrical Technology Co., Ltd.
As one of the leading dc gearmotor manufacturers and suppliers in China, we warmly welcome you to buy advanced dc gearmotor for sale here from our factory. All customized motors are with high quality and competitive price.
Address: B419, High-tech Entrepreneurship Park, High-tech Zone, Zibo City
E-mail: cui@auricmotor.com
WebSite: https://www.auricmotor.com/
