So if I have an average rpm of 100 rpm and the rates torque is .45 kgcm, does that mean this has a power output of 4000 Watts?

I know this answer is coming to you 3 years too late - and you probably figured this all out. Just in case - here is how you can calculate the power from the torque and RPM. A couple of quick notes: Torque is force times length - kg is not a force but a mass. If the "torque" is given in kg*cm - then this is not a proper torque number. It should be in Newton*cm. Newton is the unit for force and kg for mass. The force a mass experiences here on earth is the mass multiplied by the earth's acceleration of the mass in the earth's gravity. This acceleration is 9.81 m/s/s (meters per seconds squared). This unit is the same as N/kg (not that readily visible - but for now we'll just accept that as correct). Now we can calculate the proper torque by multiplying the two numbers: 4.5kg*cm * 9.81 N/kg = 44.2 N*cm. Power is work done per time - work, energy and torque are identical units of measure - force times length - the continuously delivered torque is the same as the work done by the motor. However, for the power to be correct we have to express work in N*m (SI units) - not N*cm. So we have translate N*cm into N*m. 100 cm = 1 m or 1cm = 0.01 m. We can just simply replace the cm with 0.01m and well get the torque (work) in N*m - 4.42N* 0.01m = 0.442 N*m. Next: power is Nm/s in SI units - that means we have to express 100 rpm in rps (revolutions per second = rev/sec). 1 min = 60 seconds. 100 rpm = 100 revs per 60 secs = 100/60 rps = 1.7 rps. Now we can calculate the power in N*m/s: 0.442N*m * 1.7 rps = 0.74N * m / s = 0.74W of mechanical power - which is even less power. Of course that's only correct if the 4.5kgcm number is correct for the motor. Some of the suggestions were to use the electrical power of the motor to estimate the mechanical output power. That too is a legit approach - however, that power setting given must be under the same conditions for which the mechanical output was given. E.g. the motor must run at 100 rpm and deliver the torque given - only then the current draw by the motor and the voltage accross the motor can be used to calculate the approximate mechanical power. For example - if the motor draws 1A at 12V when stalled out (motor is slowed down to a stop), then this is not the same condition as running the motor at 100 rpm. Sometimes the specifications given for those products can be a bit questionable.

Can this fit into a 1/4” metal rod? With a shaft collar or something?

If you are widening a coupler and you can, use a drill press or milling machine. Be sure the setup is as rigid as possible. Use a "reamer" 1/4" in diameter if you can get one. They are special purpose tooling but get used all the time for this exact job. They cost a few dollars. Use very low speed or even turn the chuck by hand. Do not use a hand dill at full speed with a twist bit. I would rather use 400 grit sand paper or fine abrasive padding than any sort of standard drill and bit.

How many rotations does this motor make a minute

As stated on the label.... 100 revolutions per minute (rpm)

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🔧 Gear Up for Greatness!

RISK FREE ASSURANCE - 100% unconditional return service for your peace of mind.
UNMATCHED DURABILITY - Crafted with all-metal gears for superior strength and longevity.
PRECISION ENGINEERING - D-shaped output shaft made from high hardness steel ensures impact resistance.
VERSATILE PERFORMANCE - Enjoy low noise operation with adjustable speed, capable of driving up to 15 kg.
POWER BOOSTING TECHNOLOGY - Experience a 30% increase in power with our pure copper wire core rotor.

The GreartisanDC 12V 550RPM Gear Motor is a high-torque electric micro speed reduction motor designed for durability and performance. Featuring all-metal gears, a pure copper wire core rotor for enhanced power, and a robust D-shaped output shaft, this motor is built to handle demanding tasks with low noise and adjustable speed capabilities. Backed by a reliable return policy, it's the perfect choice for professionals seeking quality and efficiency.

Reviews

J**.

Has been working reliably for a year, good torque, perfect for Arduino

I am using this for a Halloween prop where it hoists a spider (one of those 4 foot spiders you can buy at the Halloween stores) up to an overhanging branch on our front yard tree. The spider weighs about 13 oz and there is some friction in the system but the motor hoists the spider quite handily at about 0.5 m/s. It doesn't sound like it's struggling and stays cool. I'm controlling it through a Pololu motor driver and Arduino Nano and it seems to work fine with this setup. The motor makes a little noise but you can barely hear it out on the sidewalk. All in all very happy with this motor.

30.12.2024

O**T

Good product

Very nice little power pack

11.09.2025

W**Y

Great for light duty projects. Not too noisy. Good speed control.

The motor is small, compact, and not as noisy as I expected from the reviews. It had plenty of power to handle my design but only pulled 220ma, 1/5 of what the specs show. I haven't tested it at stall but I would imagine that's where they got the current spec of 1.1A. It responded well to PWM and input voltage changes for speed control. All in all I am pleased with it. I only gave it 4 stars because of the misleading specs.

23.10.2024

A**D

DC Motor Controller

The media could not be loaded. Just received the PEMENOL Motor Speed Controller. Hooked it up to a 30V 10 A DC power supply to check it out. Powered up fine when I got the power supply hooked up. The LED display is easy to read. The unit output is switched by the control knob by pushing it in. There's an LED above the knob to indicate on or off. The knob has smooth indents as you turn it, indicating the PW percentage on the LED display. It goes from 0 to 100. Don't know what the PWM frequency is. I didn't hook it up to my oscilloscope. I ultimately wanted to use the controller for a 24V gear motor, but I tried it on several other DC motors first. I tried a regular 6V DC motor it was able to control the motor very smoothly up to 100% modulation, except at really low pulse widths. Probably just too short of a voltage on time for DC motor dynamics, not a problem with the controller itself. Next I hooked up my 24V DC gear motor that runs nominally at 1000 rpm and 24VDC. The motor controller was able to again control the speed smoothly from about 15 to 100% modulation. Looks like it will work great for adding speed control between a fixed DC power supply and a lot of DC motors. Very useful and easy to connect.

16.09.2020

H**E

Another solid motor

I've bought a few motors from this seller and have never had issues with any of them. I bought this for use with a DIY project that's still in a prototype phase.So while I can't speak to the reliability of this motor in constant running time, I have had to connect this to batteries and my lab bench power supply on occasion and the motor has started up and ran fine every time. And this is why I mentioned I've bought motors from this seller prior: All of my other motors are still running just fine with no issues at all, and one is even run in less than ideal conditions.I'm confident that once I get my project failures sorted out and get this motor running in a complete project, it will last a very long time with no issues.

4.02.2022

J**T

Needs more grease in the gear case to extend its service lift.

Will work for a few hrs. then the Grear case will seize up, so the next one I separated the gear case a packed with white lithium grease and it has lasted for three years. Used in an animated outdoor windmill

17.02.2025

J**N

Works OK, but pretty noisy

Works OK, but pretty noisy.

5.06.2025

J**J

Great!

Very nice motor, plenty of torque. Size measurements provided on the Amazon web page were accurate.

30.07.2025

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