United Motion Inc. – A Chicago-Based Motion Solution Provider
Focus on R&D and customization of electric motors. Provide comprehensive one-stop services from design, manufacturing, supply chain management, to after-sales support. Grow with clients and drive the success to a new height!
PMDC Motor – ST Series with NMRV Gear Box
Our ST series PMDC Motor (Brushed DC Motor) is designed for versatile motion control applications and optional to be integrated with an NMRV worm gearbox to deliver both efficiency and durability in a compact package. The combination of our ST series PMDC Motor and NMRV gearboxes provides smooth torque transmission, excellent load capacity, and flexible mounting options.
Our ST series PMDC motor offers stable speed control, high starting torque, and low power consumption, while the NMRV gearbox enhances output torque and allows precise speed reduction. Its worm gear design ensures quiet operation and self-locking capability — an ideal feature for applications where holding torque is required without continuous power consumption.
With an aluminum alloy housing, the NMRV reducer provides lightweight strength, corrosion resistance, and superior heat dissipation. Together, the PMDC motor and NMRV gearbox form a compact, efficient, and maintenance-friendly drive unit, suitable for conveyors, packaging machinery, automation equipment, and various industrial applications where reliability and performance are key.
United Motion Inc. is not only the authorized distributor in North America, but also a sister company of Greensky Power Company.
We have a manufacturing facility in China which has been operated for over 15 years, with a new facility in Thailand under construction.

Customer Service
United Motion Inc.’s motion solution apply in diverse areas all around the world.
Our sales and engineering support teams are ready to assist you with any questions, including quotation, application support, and product configuration.
Please submit your requirements through our Custom Service Form to ensure a faster response. Or you can reach us at info@unitedmotioninc.com for general inquiries.
Tell Us About Your Application Requirements
United Motion Inc welcomes inquiries and challenges. If you find our standard products cannot meet your need, please feel free to contact us for customization. Our professional engineering and service team will quickly review your need and propose a solution if we can make it.
We look forward to communicating and collaborating with you!

