Brushless DC Linear Motor Ironless Low Cogging- Suzhou Retek Electric Technology Co., Ltd.

Ironless BLDC Linear Motor: Zero Cogging, Ultra-Smooth Motion

The Ironless (U-Channel) Brushless DC Linear Motor uses a primary stage where the copper coils are self-supporting and epoxy-potted, with no iron laminations.

The absence of iron eliminates the interaction between the coils and the magnet track, resulting in Zero Cogging Force and Zero Attraction Force between the primary and secondary. This is crucial for applications requiring ultra-smooth, high-precision motion with minimal velocity ripple, such as high-accuracy inspection or printing systems. While it provides slightly lower continuous force density than the iron core type, its smoothness and lack of attractive forces make it the gold standard for precision control.

Introduction

Detailed Parameters and Performance Data

RETEK: Precision for Metrology and Optical Scanning

Suzhou Retek Electric Technology Co., Ltd. provides ironless linear motors tailored for highly sensitive motion control. Our focus is on achieving the lowest possible mass and the highest possible smoothness. By eliminating cogging, we simplify the servo control loop, allowing for superior velocity control and positioning repeatability, making it the preferred choice for metrology, high-resolution printing, and delicate material handling.

Applications

Advanced Technology Highlights

Ultra-Precision Linear Motion Applications

Precision Metrology/CMM Machines: Actuators for coordinate measuring machines and high-accuracy surface scanners. Challenge: Zero force ripple, sub-micron resolution.
High-Resolution Inkjet Printing: Drives for carriage systems requiring extremely consistent velocity control (e.g., <0.1% ripple) to ensure image quality.
Optical Inspection and Alignment: Motors for moving cameras or lenses where any vibration or jitter must be eliminated.
Semiconductor Bonders: Ultra-precise placement of micro components.

Technical Specifications

Industrial & Commercial Usage

Technical Parameters (Ironless Linear Motor)

Parameter	Range / Typical Value	Unit
Type	Brushless DC, Ironless	Design
Cogging Force	Zero	Characteristic
Attraction Force	Zero	Characteristic
Primary Mass	Very Low	Rating
Thermal Management	Conduction/Forced Air	Type

Additional Information

Supplementary Details & Notes

Production & Customization Services

Manufacturing involves advanced coil winding and potting processes to ensure the structural integrity of the ironless coil. The final system is tested for sub-micron velocity ripple.

Custom Coil Mass: Adjusting the coil geometry and length to precisely match the moving load mass for optimal acceleration.
Integrated Water Cooling: Offering high-end versions with internal channels for liquid cooling to maximize continuous force output without thermal derating.
Magnet Track Geometry: Providing various track widths and magnet pitches to tune the force constant (Kf) to specific drive voltages.
Cable Management: Supplying miniature, high-flex cables specifically designed to manage the high acceleration forces.

Service & Support

Technical Advantages and Core Design Features

Perfectly Smooth Motion: Zero cogging means the motor can move with absolute smoothness, even at very low speeds.
Zero Attraction Force: The carriage guide rails do not need to counteract strong magnetic forces, simplifying the mechanical bearing system and minimizing friction/wear.
Lightweight Primary: The low mass of the coil assembly allows for extremely high acceleration of the motor itself.
High Efficiency at Low Load: No iron losses, making it very efficient for low-force, high-speed scanning moves.
Maintenance Free: Non-contact, eliminating mechanical wear and replacement parts.

Frequently Asked Questions

Common Inquiries Regarding Ironless Linear Motors

Q: Why is the continuous force lower than the Iron Core type?
A: Without the iron core to guide the magnetic flux, the air gap is larger, and less of the magnetic field is converted into useful force, thus reducing the force density (Force per Watt or Force per Volume).

Q: Are Ironless motors susceptible to heat?
A: The coreless coil must be carefully designed for thermal dissipation, as the absence of a large iron mass means heat must be removed primarily via the housing. Overheating can damage the potting compound and coil.

Q: How are these motors mounted?
A: The U-channel magnet track provides a robust, stable base. The coil primary is typically mounted to the moving carriage (via high-stiffness guide rails) and floats centrally within the U-channel.

Resources

Advanced Material Selection Guide

Primary Coil: Self-supporting copper windings encapsulated in a high-thermal-conductivity epoxy potting compound.

Magnet Track: Two parallel rows of high-strength NdFeB magnets, creating the powerful U-channel field necessary for interaction with the ironless primary.

Housing: Machined aluminum or carbon fiber primary housing to minimize the moving mass.

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 Brushless DC Linear Motor Ironless Low Cogging Manufacturers and Wholesale Brushless DC Linear Motor Ironless Low Cogging 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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