Coreless Brushed Dc Motor 10mm to 20mm High Efficiency- Suzhou Retek Electric Technology Co., Ltd.

Coreless DC Motor: High Efficiency, Dynamic Response, and Miniaturization

The Coreless Brushed DC Motor (diameter 10mm to 20mm) is a specialized permanent magnet motor design where the rotor winding is a self-supporting, basket-like cup (skew-wound) without a ferrous core.

The absence of an iron core results in three major technical advantages: 1) Extremely Low Rotor Inertia: Leading to phenomenal acceleration, deceleration, and high dynamic response (short mechanical time constant). 2) Zero Cogging Torque: The lack of slotting means the motor rotates smoothly, even at very low speeds. 3) High Efficiency: Minimal core losses. These characteristics make them indispensable for portable, precision, and high-response micro-actuators, often operating on low voltage (e.g., 3V to 12V).

Introduction

Detailed Parameters and Performance Data

RETEK: Micromotion and Portable Power Precision

Suzhou Retek Electric Technology Co., Ltd. provides high-precision coreless motors for applications where size, weight, efficiency, and dynamic performance are paramount. We use precious metal commutation systems (gold/silver alloy) in the smallest sizes to ensure low electrical noise and high starting reliability. Our production focuses on precise winding symmetry and dynamic balancing to maximize the motor's lifespan and efficiency under high-speed operation, typically in conjunction with miniature gearheads.

Applications

Advanced Technology Highlights

Precision and Portable Applications for Coreless DC Motors

Miniature Robotics and Drones: Actuators for micro-flaps, gimbals, and small flight control surfaces requiring extremely fast response. Challenge: High power-to-weight ratio.
Medical Handheld Devices: Motors for surgical tools, drug dispensing pumps, and portable diagnostic equipment.
Optical Focus and Zoom: Actuators for automated lenses and micro-positioning stages requiring sub-micron resolution control.
Tattoo Pens and Power Tools: Lightweight motors requiring high speed and smooth operation.

Technical Specifications

Industrial & Commercial Usage

Technical Parameters (Coreless Brushed DC)

Parameter	Range / Typical Value	Unit
Diameter	10 to 20	mm
Rotor Inertia	Extremely Low	g ⋅ cm$^2$
No-Load Speed	5,000 to 15,000	RPM
Commutation	Precious Metal or Carbon	Type
Mechanical Time Constant	Typically <10	ms

Additional Information

Supplementary Details & Notes

Integrated Production and Customization Workflow

Manufacturing involves automated coil winding and precise balancing of the rotor cup. Final testing includes measuring the mechanical time constant and ensuring the no-load current is minimal, indicating high efficiency.

Miniature Gearhead Coupling: Factory integration with low-backlash miniature planetary gearheads (e.g., 16mm or 22mm) for high-torque output.
Integrated Encoder/Tachometer: Mounting miniature magnetic or optical encoders to the motor's rear shaft for closed-loop speed and position control.
Winding Optimization: Customizing the winding to meet specific battery voltages (e.g., 3.7V, 7.2V) for optimal efficiency in portable devices.
Shaft Customization: Providing custom shaft lengths, micro-splines, or pinions for direct integration into client assemblies.

Service & Support

Technical Advantages and Core Design Features

Exceptional Dynamic Response: Achieves rapid speed changes due to very low rotor inertia, crucial for transient or pulsed applications.
Zero Cogging Torque: Enables extremely smooth, vibration-free rotation, even at stall and very low speeds, which is vital for sensory and optical systems.
High Efficiency: Typically >85% peak efficiency due to the elimination of iron losses in the rotor.
High Power-to-Weight Ratio: Delivers high power output relative to its compact size and minimal weight.
Linear Speed/Torque Curve: Highly predictable performance, simplifying control loop design for precise speed regulation.

Frequently Asked Questions

Common Inquiries Regarding Coreless DC Motors

Q: What is the main limitation of coreless motors compared to iron-core motors?
A: Thermal Capacity. The winding is self-supporting and dissipates heat less efficiently than one embedded in an iron core, meaning continuous torque and current must be strictly limited to prevent winding burnout. They are best suited for intermittent or light continuous loads.

Q: Why are precious metals used for commutation in small sizes?
A: In very small motors, the current is low, and using precious metal brushes (e.g., gold or silver alloy) ensures extremely low contact resistance, reducing frictional losses and minimizing electrical noise, which is critical for sensitive electronics nearby.

Q: Can I use a coreless motor without a gearhead?
A: Yes, for high-speed tasks like fans, scanners, or tattoo machine operation. However, for applications requiring high torque (e.g., pumps, actuators), they are almost always paired with a miniature planetary or spur gearhead.

Resources

Advanced Material Selection Guide

Rotor Winding: Skew-wound, self-supporting copper wire bundle, often bonded with high-temperature epoxy for structural integrity.

Magnet: High-strength Neodymium Iron Boron (NdFeB) ring magnet, providing maximum magnetic flux density within the compact stator.

Commutator: Gold or silver-plated copper alloy for minimal resistance and wear in micro-actuators; standard copper/carbon for higher current loads.

About Suzhou Retek Electric Technology Co., Ltd.

Unlike other motor suppliers, Retek engineering system prevents the selling of our motors and components by catalogue as every model is customized for our customers. The customers are assured that every component they receive from Retek is designed with their exact specifications in mind. Our total solutions are a combination of our innovation and a close working partnership with our customers and suppliers.

As China Coreless Brushed Dc Motor 10mm to 20mm High Efficiency Manufacturers and Wholesale Coreless Brushed Dc Motor 10mm to 20mm High Efficiency OEM/ODM Suppliers, Retek business consists of three platforms: Motors, Die-Casting and CNC manufacturing and wire harness. Retek products are widely supplied for residential fans, vents, boats, airplanes, medical facilities, laboratory facilities, trucks and other automotive machines.

Welcome to send us an RFQ, it is believed you will get the best cost-effective products and services here!

Customized Solutions

Quality Assurance

Global Export

Suzhou Retek Electric Technology Co., Ltd.

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