From Prototyping to Production
Build high-performance frameless motors for robotics and automation.
Mosrac knows every application is different. That’s why we provide fully standard or custom frameless motor solutions based on your needs—such as torque, voltage, size, structure, and materials. From coils and magnets to lead wires, our engineers work with you to design the right motor to fit our exact needs.
From Prototyping to Production
Build high-performance frameless motors for robotics and automation.
Mosrac brings your ideas to life—from early prototypes to volume production—with speed, reliability, and consistent quality.
As one of the most comprehensive frameless motor manufacturers, Mosrac knows every application is different. That’s why we provide fully standard or custom frameless motor solutions tailored to your needs, including torque, voltage, size, speed, and materials. From coils & magnets to lead wires, our engineers work with you to design the right motor to fit your exact needs.
innovative companies
Mosrac Manufacturing Services from Prototyping to Production
At our own factory in Shenzhen, OEMs rely on Mosrac to develop and manufacture motor solutions tailored to their exact device, application, brand, and system needs—from early prototypes to volume production—with speed, reliability, and consistent quality.
Ultra-Compact frameless motor
Introducing U-series frameless inrunner motors in 12, 14, 16, and 19 mm OD for robot fingers, grippers, and other ultra-compact precision motion applications. View all
Frameless Inrunner Motors
Introducing U-series frameless inrunner motors in 25, 38, 60, and 130 mm OD for robot joints, medical, and other compact precision automation applications. View all
Frameless Outrunner Motors
Introducing UE-series frameless outrunner motors in 15 to 109 mm OD for surgical tools, dexterous hands, humanoid limbs, and cobot precision automation applications. View all
Housed Direct Drive Rotary Motors
Mosrac’s housed direct drive rotary torque motors provide compact, high-torque rotary solutions in varied sizes to fully fit diverse industrial and robotic system needs. View all
Inductive Rotary Absolute Encoders
Mosrac inductive encoders deliver compact, high-accuracy absolute position feedback with hollow-shaft, non-contact designs for robotics, motors, and automation. View all
Humanoid Planetary Robot Actuator
Mosrac planetary joint modules integrate motors, gearboxes, encoders, and drives into compact actuators, delivering high torque, precision, efficiency, and reliability. View allThe platform for everyone from startups to global enterprises
Smart Production Starts Here
Our manufacturing approach integrates advanced technology with dedicated human support, allowing us to tailor each solution to your project’s specific industry requirements, budget, and timeline.
Commercial Off-The-Shelf
Our commercial-off-the-shelf (COTS) motors are built to handle a wide range of demanding applications. The lineup includes more than 100 standard motors, ranging from frameless inrunner BLDC motors in our U-series to outrunner BLDC motors in our UE-series. Datasheets are available for each model, and typical lead times are about 4-6 weeks.
Modified Off-The-Shelf
MOTS (“modified-off-the-shelf”) motors share the same frameless mechanical design as COTS motors, but use a custom winding. This winding sets the motor’s V (rpm/V), allowing you to tailor it to your application. Mosrac’s engineering team offers electrical design process, including a full study with datasheets and performance simulations.
Fully Custom
If an MOTS solution is not sufficient and significant tailoring is required, an FC (“fully-custom”) solution is the best choice. FC drive solutions are often highly application-specific and adjusted to complex requirements. Examples of customization options include:
- Define mechanical requirements (torque/speed) to application
- Identify environmental constraints (temperature, IP rating, etc.)
- Define power supply (peak & continuous current and voltage)
- Define the size available for the motor (OD, ID, Length)
- Design custom housing for frameless stator and rotor
From Prototyping to Production
Hot-Selling Products
Find the precision frameless torque motor, inductive encoder, magnetic encoders, reducers and robot joint module for your special application. Mosrac’s products serve global markets based on both customer-specific (ODM) and our own products (OEM), focusing on cutting-edge motion-control technology.
U12 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U14 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U16 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U19 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U25 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U32 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U38 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U43 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U50 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U60 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U68 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U76 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U85 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U94 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U104 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U115 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U130 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U160 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
U200 Series
Frameless Inrunner Torque Motor
Stator OD (mm): 12
Rotor ID (mm): 4.8
DC Voltage (Vdc): 12/24
Rated Torque (Nm): 0.004~0.02
Rated Speed (rpm): 2000~15000
Your Trusted Manufacturing Partner in China.
Global Shipping
Based in China, Mosrac combines in-house production with a strong R&D team to deliver fast, high-quality on-demand manufacturing solutions. As a leading China-based manufacturer, we offer global shipping to North America and Europe in as little as 10–40 days. With English-speaking project engineers and fast response times, we support customers across time zones to keep production running smoothly.
Customers Worldwide
Countries & Regions Served
Machines Set
Factory in Total
How to Work With Us
A straightforward four-step process — from your specs to a custom quote, precision manufacturing, and on-time delivery of tested motors.
Submit your Motor specs
Send us your torque, speed, voltage, size, and mounting requirements, along with any drawings you have.Get a Quote & Design
Within 24 hours, our engineers deliver an electromagnetic design, sizing recommendation, and a firm quote.We start manufacturing
Once you approve the quote, production begins, including winding, varnishing, and dynamic balancing.Your motors ship out
Every unit passes performance testing and final visual & cleaning inspection before it’s packed and shipped.End-to-End Solutions for New Motor Development
Comprehensive solutions for all your frameless and housed motor needs, from design to delivery.
Project Initiation, Consult & Design
From concept to manufacturable design, we help your brands turn ideas into prototype-ready solutions.
Industrial design
Material and finish plan
Mechanical design
Cost estimation
Prototype & Low-Volume Runs
Our extensive network supports prototyping and low-volume production, delivering fast, accurate manufacturability feedback.
Manufacturing consulting
Testing support
Assembly support
Low-volume production
Mass Production
We help businesses scale by connecting trusted material suppliers and managing production with full transparency.
Supply chain integration
Technical support service
Raw materials procurement
Cost & delivery oversight
Packaging & Delivery
Our team handles both product and packaging manufacturing, so your goods arrive safe and professional.
Packaging design
Packaging management
Sample testing
Packaging execution
OUR TIMELESS MISSION
Major Industries Served
Tailored manufacturing solutions for demanding sectors.
Aerospace
Soar higher with our high-performance, reliability, durability standards, and custom solutions.
Consumer Electronics
Experience unparalleled performance and high efficiency with our advanced torque motor.
Food & beverage
The food and beverage industry is constantly working to improve efficiency, quality, and safety.
Industrial Automation
Accelerate productivity and precision with our robust, high-precision frameless motors.
Machine tools
Experience unmatched speed, precision, reliability, efficiency, and durability for applications.
Medical
Drive innovation with our diverse range of medical motor solutions for surgical robotics and more.
Printing
Achieve exceptional print quality, speed, and consistency through our innovative and precise motor.
Robotics
Revolutionize robots with compact motors that deliver unmatched speed and efficiency.
Semiconductor
Achieve unmatched throughput and reliable precision using advanced frameless motor.
Vehicles
Improve overall vehicle performance & driving efficiency using precision torque motors.
Mosrac FAQs
Find quick answers about manufacturing, lead times, materials, quality control, and more.
Need more support?
Start a quote or contact us today.
What is minimum order quantity?
Our MOQ varies by motor and customization level. To get an accurate MOQ for your desired product, please contact our sales team. We understand every business is unique, and we strive to accommodate diverse order sizes.
What industries do your motors serve?
Our motors are widely used in robotics, automation, medical equipment, semiconductor manufacturing, printing, packaging, and other industries requiring precise motion control.
Can you produce motors below MOQ?
While we recommend meeting our MOQ to optimize production efficiency, we can consider smaller orders on a case-by-case basis. For samples or small quantities, please contact our sales team for personalized assistance.
Do you offer motor customization?
Yes, we excel in custom motor design and manufacturing. Our engineers can work closely with you to develop a motor tailored to your specific requirements.
How long is your production time?
Production time typically ranges from 15 to 45 business days but can vary based on product complexity and order volume. For precise estimates and to view product-specific lead times, please visit our product pages.
How do you ensure product quality?
We maintain strict quality control throughout production, including material inspection, assembly testing, and final performance verification. We follow industry standards and certifications to ensure product reliability.
What types of motors do you offer?
What is your warranty policy?
We provide a standard warranty on our products. Specific warranty terms and conditions may differ based on the motor model and purchase agreement. Please consult our warranty documentation for detailed information.
Can I get a prototype before batch?
Yes, we provide digital proofs for your review and approval before starting production. This ensures that the final product meets your exact specifications.
What is lead time for custom motor?
Lead times vary based on product complexity and order volume. Typically, it ranges from 2 to 6 weeks. For exact timelines, please consult with our sales team.