Helical Geared Motors
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View productsGeared Motors & Gearboxes
Speed and torque matched to the machine
Nairobi Power Engineers supplies geared motors and gearboxes that convert motor speed into the output speed and torque a machine needs. We size the unit from the required output, the duty cycle and the service factor.
Helical, worm and bevel-helical units suit different mounting and efficiency needs; we select the ratio, mounting and service factor so the drive delivers the torque without overheating or premature wear.
Use the calculator on this page to see output speed, torque and the service-factor design torque for a given motor rating, input speed and ratio.
24/7 Emergency Support
Electrical service you can count on
When geared motor equipment fails, you need fast, reliable help from experienced engineers. We offer around-the-clock emergency support across Nairobi and East Africa — keeping your plant safe and powered, day or night. Whether it is an urgent breakdown or a scheduled repair, our team is ready to respond whenever you need us.
Cost and Estimates
What drives the cost
What affects the cost?
Output torque and ratio, gearbox type and mounting, the coupled motor and the service factor for the duty. Shock loading and running hours drive the selection.
Get a detailed estimate
We quote the geared motor as a complete drive — gearbox, motor and mounting — sized for the machine.
Service factor matters
The gearbox is sized above the running torque by a service factor for the duty, so shock and continuous loads do not shorten its life.
Right gearbox type
Helical for efficiency, worm for compact right-angle drives, bevel-helical for high-torque right-angle duty.
Product Family
Select the range for the job
Engineering Calculator
Geared Motor Output Calculator
Output speed, torque and service-factor design torque from motor rating, input speed and ratio.
Results
Output Speed
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Output Torque
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Service Factor
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Design Torque
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* Preliminary. Confirm gearbox thermal and mechanical rating for the duty cycle.
Frequently asked questions
How do I find the output speed?
Divide the motor speed by the gear ratio. The calculator on this page returns the output speed, torque and design torque.
What service factor should I use?
Uniform loads ~1.0, moderate shock ~1.4, heavy shock ~1.75; we confirm from the machine and running pattern.
Helical or worm?
Helical is more efficient and suits in-line drives; worm gives a compact right-angle drive with high ratios but lower efficiency.
Can you match to my existing motor?
Yes, we size the gearbox to the coupled motor rating and speed, or supply the complete geared-motor unit.
When in doubt, put safety first
If you are ever unsure or feel unsafe, do not take chances — call a licensed engineer. Safety always comes first. Contact us for verification, specification and installation support.
+254 0737-944-014Speak to our experts