Compact DC Brushless Motors- Suzhou Retek Electric Technology Co., Ltd.

Design Innovation in Miniaturized Coreless and Cored BLDC Technology

Compact BLDC motors are fundamentally driven by the need for high efficiency and dynamic performance within extremely confined spaces. Our range includes Coreless BLDC motors (e.g., WC 22 Series) and miniaturized cored motors.

Coreless designs eliminate iron losses (hysteresis and eddy currents) and cogging torque, resulting in smoother operation, especially at low speeds, and a significantly lower rotor inertia. This is vital for quick start/stop cycles, such as in medical dispensing or handheld fan motor applications (Wo22 Series, 20000RPM). Cored designs, though heavier, achieve higher torque density via very thin stators (<0.2mm) and high slot fill factors.

The key technical challenge is heat management; our motors address this with specialized housing materials and potting compounds that improve heat conduction from the winding to the motor casing.

Introduction

Detailed Parameters and Performance Data

RETEK: Precision and Reliability in Micro-Motion Control

Suzhou Retek Electric Technology Co., Ltd. excels in the sub-50mm diameter motor category, demanding micron-level precision in assembly. We serve demanding sectors like surgical robotics and high-end personal devices where minimal weight and acoustic output are non-negotiable. Our engineering team focuses on creating a high KV (speed constant) with a low mechanical time constant, facilitating rapid control loops and instantaneous response. The compact servo motors for medical use are manufactured in a controlled environment to ensure the highest standards of cleanliness and consistency required by medical device OEMs.

Applications

Advanced Technology Highlights

Micro-Applications and Constraints

Surgical Robotics and Medical Drills: Motors for minimally invasive surgical tools and high-speed dental drills. Constraint: Must be sterilizable (autoclavable) or disposable, and generate minimal vibration/heat.
High-Speed Personal Fans/Blowers: High KV motors (up to 40,000 RPM) for high-performance handheld fans and small vacuum cleaners. Constraint: Acoustic noise must be strictly controlled, necessitating dynamic balancing to G1.0 or better.
Ai Camera and Lidar Systems: Motors for auto-focus mechanisms, gimbal stabilization, and shutter control. Constraint: Zero backlash and instantaneous settling time for optical precision.
Micro Actuators: Motors in prosthetic devices, miniature grippers, and laboratory pipetting systems.

Technical Specifications

Industrial & Commercial Usage

Technical Parameters

Parameter	Range / Typical Value	Unit
Outer Diameter Range	15 to 30	mm
Mechanical Time Constant (τm)	< 10	ms
Nominal Voltage	3.7 to 24	VDC
Acoustic Noise (No Load)	< 40	dBA
Rotor Inertia (J)	Extremely Low	g ⋅ cm$^2$
Protection Options	IP50 to IP65	Rating

Additional Information

Supplementary Details & Notes

Integrated Production and Customization Workflow

Our assembly utilizes automated dispensing equipment for precise adhesive application and uses laser welding for critical terminal connections to ensure reliability. Every motor undergoes a high-speed break-in and acoustic signature test before shipment.

Shaft Material and Hardness: Customizing the shaft material, heat treatment, and surface finish (e.g., passivation) based on the client's output mechanism (e.g., gear, pulley, spline).
Acoustic and Vibration Tuning: Specific adjustments to the dynamic balancing and bearing choice to meet client-specific noise floor requirements (e.g., for quiet environments).
Sterilization Compatibility: Using autoclavable materials (e.g., PEEK, specific magnet coatings) for medical devices that require steam sterilization.
Integrated Driver PCB: Designing and integrating the micro-driver PCB directly into the motor endcap to achieve the ultimate compact system form factor.

Service & Support

Technical Advantages and Core Design Features

Ultra-Low Rotor Inertia: Achieved through coreless construction, resulting in extremely high acceleration and deceleration rates, crucial for highly responsive servo applications.
Zero Cogging Torque: The absence of iron in the rotor/stator interaction (coreless) ensures exceptionally smooth torque transmission, particularly at speeds near zero and during low-speed reversal.
High Rotational Precision: Manufacturing processes minimize radial and axial run-out, enabling precise alignment for high-speed coupling to gears or spindles.
Optimized Commutation: Utilizes advanced sensorless or miniaturized Hall sensor technology for efficient electronic commutation, minimizing power losses in battery-driven devices.
Reduced Vibration and Noise: Precision dynamic balancing and acoustic damping materials ensure quiet operation, a critical requirement for personal and medical devices.

Frequently Asked Questions

Common Inquiries Regarding Compact BLDC Motors

Q: Why is coreless design favored for high-speed compact motors?
A: Coreless motors offer extremely low rotor inertia, allowing them to accelerate to speeds like 20,000 RPM much faster than cored motors. They also lack iron, which eliminates eddy current losses, making them highly efficient at high RPM.

Q: Can these small motors be used with gearheads?
A: Yes. Compact motors are often paired with miniature planetary gearheads (e.g., 28mm diameter) to achieve high torque in a compact volume, particularly in robotic joints and actuators. The low cogging torque is beneficial for smooth operation with minimal backlash.

Q: What is the typical lifetime of the miniature bearings in these high-speed motors?
A: Due to the high rotational speed, bearing selection is critical. Using shielded, pre-lubricated high-precision stainless steel bearings, we typically guarantee an L10 life of 10,000 hours at rated speed and load.

Resources

Advanced Material Selection Guide

Housing: Lightweight, precision-machined aluminum (e.g., 7075 grade) or high-strength engineering plastics for weight reduction in handheld and mobile applications.

Shaft: Stainless steel is common for corrosion resistance (medical/outdoor), with ceramic or tungsten carbide used in extreme high-speed or high-wear applications.

Winding: Extremely thin (<0.1mm) copper wire, often self-bonding, is used for coreless windings to maintain structural integrity without external support.

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 Compact DC Brushless Motors Manufacturers and Wholesale Compact DC Brushless Motors 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.

Recommended LINS

High Torque Brushless DC Motors Low Cogging Brushless DC Motors Brushless DC Linear Motor Iron Core High Force Brushless DC Fan Motor for High CFM Cooling Brushless DC Motor with Integrated Controller Brushless DC Linear Motor Ironless Low Cogging High Power Brushless DC Motors Low Voltage Brushless DC Motors (24VDC)

Message Feedback