Custom Motor ComponentsSinotech specializes in the manufacturing of motors and custom motor components, such as laminations, commutators, and more. When you come to us with your ideas, our engineers create designs based on your vision and needs. To keep costs low, we pair our U.S.-based engineering and support with TS-16949-certified factories that build custom motor components in the Pacific Rim. Our dedicated bilingual Supplier Quality Engineers in our international offices inspect, audit and oversee projects in person, so you never have to worry about the quality of the factories, subcontractors and raw materials used in your outsourced components.

Custom Engineered Motor Components: Our Approach and Considerations


Sinotech specializes in the design and manufacturing of motors and custom motor components. When we manufacture a motor, experienced auditors and specialists review the process regularly from start to finish, verifying that every component meets your quality standards.

Motors in Sinotech’s comprehensive catalog include:

  • AC motors
  • DC motors
  • Brushless DC motors
  • BLDC motors with embedded logic
  • High-speed slotless BLDC motors
  • Miniature motors
  • Coreless motors
  • AC and DC Gear motors
  • Permanent magnet motors
  • AC and DC Servo motors
  • Stepper motors

Armatures and Field Coils

Sinotech sources armatures and field coils from the Pacific Rim so you benefit from the most competitive rates without sacrificing the high quality, service and terms you expect. As a fully integrated supplier of custom windings in the gyro and electromechanical motor industries, we use intelligent manufacturing processes and stack all motor laminations using the best tools and fixtures.


When manufacturing commutators at its QS9000-certified factory, which has materials certifications for resin and copper raw materials, Sinotech specialists ensure materials are sourced from reputable suppliers. Our factory controls its progressive die stamping processes, employs spin testing, and has metallurgy labs verify a material’s purity and hardness.

Custom motor components include mica, industrial steel core, expanded tang, molded shell, and large shell air gap commutators.

Graphite Motor Brushes

Sinotech carefully inspects the raw materials kept at its factory’s storerooms to bring you a full line of quality, individually molded graphite brushes at competitive prices. Our factory is highly automated to ensure proper calibrations at all stages of the manufacturing process. Because motor characteristics may affect graphite compounding, we test the brushes using motors. In addition to graphite brushes, Sinotech manufactures copper graphite brushes, which are popular for automotive applications.

Motor Magnets & Neodymium Magnets (Rare Earth Magnets)

Sinotech’s partners in China offer the most economical, highest-quality ceramic motor magnets. Our designers will help you prepare the details they’ll need, such as required surface porosity, measurements and number of chips. When it comes to neodymium magnets, the top considerations when sourcing for custom engineered motor components are plating quality, uniformity and thickness. Sinotech inspectors make sure magnet platings are free of pinholes.

Motor Shafts

As one of the more challenging custom motor components to source, Sinotech ensures a facility can obtain the necessary shaft alloys and handle the unique hardening requirements and complex geometry. The factories we collaborate with use sufficient texturing and highly automated processes.

Wound Coils

Several offshore motor assembly factories have winding workshops. However, it can be difficult to find a factory that’s willing to sell its winding services. This is why Sinotech has its own factory to meet client needs, making it one of the few totally integrated suppliers of custom windings in the world. Our auditors pay special attention to the insulating and wire materials used by hiring an independent laboratory to test the thermal properties and look for defects.

Sinotech Custom Motor ComponentsIn addition to the custom motor components listed, Sinotech specializes in the manufacturing of a variety of cast, forged and stamped metal parts, as well as injection-molded plastics. Our suite of services also includes assembly services and completely assembled motors.

Outsourcing custom motor components overseas is a great way to save time and money if you know how to navigate the landscape. Sinotech’s team of engineers and specialists will guide you through every step, so you can feel confident working with an insured U.S.-based company that operates under U.S. laws. Request a quote for your custom project today.

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