What is Linear Motor Coil Winding?
Linear motor coil winding is a highly specialized manufacturing process for creating the primary stationary component (stator or forcer) of a linear motor. Unlike rotary motors that produce torque, linear motors generate a direct linear force. The quality, density, and precision of the coil winding directly determine the motor’s thrust, efficiency, and thermal stability.
At JHCOILS, we master the challenges unique to linear motors, such as maximizing copper fill in constrained geometries and maintaining extreme flatness to ensure a consistent air gap, which is critical for smooth, cog-free motion.
The JHCOILS Advantage in Linear Motor Coils
Maximum Thrust Density
Our advanced winding techniques achieve superior copper fill factors, maximizing the electromagnetic force generated in a given volume. This results in higher thrust without increasing the motor’s footprint.
Superior Thermal Management
Using premium, high-temperature self-bonding wire and ensuring tight, void-free windings, we create coils that efficiently dissipate heat. This allows for continuous high-duty cycle operation without thermal degradation.
Exceptional Precision & Flatness
We utilize custom-machined fixtures to guarantee exceptional flatness and tight dimensional tolerances, even for large or complex coil shapes. This is critical for maintaining a uniform magnetic field and simplifying final motor assembly.
Technical Specifications & Capabilities
We are equipped to handle a wide spectrum of project requirements, from miniature coils for medical devices to large, high-force coils for industrial machinery.
| Parameter | Capability |
|---|---|
| Maximum Coil Length | Up to 5.118 inches (130 mm) |
| Maximum Coil Thickness | Up to 1.575 inches (40 mm) |
| Wire Diameter Range | 0.0118 to 0.0472 inches (0.3 mm to 1.2 mm) |
| Wire Material | Class 200 Self-Bonding Copper Wire (EAIW+SB) |
| Flatness Tolerance | Typically within 0.005 inches (0.127 mm), can be tighter |
JHCOILS Standard Linear Motor Coils
JHCOILS has been manufacturing linear motor coils for over 10 years. With mature winding processes and a strong engineering team, we can easily handle diverse applications and customize not only the materials but also wire gauge, turn count, length, width, window dimensions, mounting pitch, DC resistance, inductance, insulation class, and lead/connector options. We always listen to your ideas and provide professional suggestions to help you balance efficiency, heat, size, and cost.
Backed by multiple automated precision winding and potting lines, JHCOILS delivers stable capacity and dependable lead timesโso you never worry about stockouts in peak seasons. Our extensive tooling and process library allow us to offer competitive pricing and shorter delivery cycles while maintaining consistency and quality.
Below, youโll find several standard specifications of linear motor coils (using standard tooling with no new mold required). Choose your type to get a favorable price and fast delivery. If you canโt find the ideal type, no problemโfeel free to consult our experts. Weโll tailor a solution to your target force, stroke, response speed, operating voltage, and installation space, and deliver a custom coil that meets your performance goals.
| Model | Shape | Coil ID | Coil OD | Coil Wide(thickness) | Wire Size | Resistance(1khz/1v) |
|---|---|---|---|---|---|---|
| LMC-C01 | Rectangle | 5.5mm*16.5mm | 12.6mm*23.4mm | 15.2mm | 0.55mm | 0.61 ฮฉ |
| LMC-C02 | Rectangle | 5.5mm*12.1mm | 12.7mm*18.6mm | 15.1mm | 0.55mm | 0.52 ฮฉ |
| LMC-C03 | Rectangle | 6.9mm*15.2mm | 16.8mm*24.3mm | 7.3mm | 0.18mm | 26 ฮฉ |
| LMC-C04 | Rectangle | 11mm*59.4mm | 21.45mm*69.7mm | 18.3mm | 0.6mm | 1.87 ฮฉ |
| LMC-C05 | Rectangle | 29.6mm*29.6mm | 4.17mm*40.17mm | 6.2mm | 0.4mm | 3.25 ฮฉ |
| LMC-C06 | Rectangle | 4.7mm*25mm | 12.5mm*32.3mm | 6mm | 0.3mm | 3.66 ฮฉ |
| LMC-C07 | Rectangle | 5.6mm*28.5mm | 12.5mm*34.5mm | 4.4mm | 0.3mm | 3.2 ฮฉ |
| LMC-C08 | Rectangle | 3mm*31.4mm | 9.1mm*36.7mm | 2.4mm | 0.28mm | 1.36 ฮฉ |
| LMC-C09 | Rectangle | 8.2mm*26mm | 39.2mm*54.4mm | 9.25mm | 0.5mm | 3.64 ฮฉ |
| LMC-C10 | Rectangle | 8.9mm*14mm | 22.5mm*28mm | 5.1mm | 0.45mm | 1.02 ฮฉ |
Applications Across Innovative Industries
Our custom linear motor coils are the driving force behind precision and speed in a wide range of industries where performance and reliability are non-negotiable.
Semiconductor & Electronics
Medical & Life Sciences
Industrial Automation & Robotics
Custom Coil Shapes for Any Motor Design
Linear motor performance is heavily influenced by the coil’s geometry. We have the expertise to wind coils in virtually any shape to optimize the magnetic circuit of your specific motor topology.
- Rectangular & Square Coils: The most common shapes, optimized for uniform force along a linear path.
- Trapezoidal Coils: Used to minimize force ripple (cogging) at the ends of the motor's stroke.
- Round & Oval Coils: Often used in tubular linear motors and specialized actuators.
- Custom Irregular Shapes: Fully bespoke geometries designed to fit within unique mechanical constraints or achieve specific force profiles.
Our End-to-End Manufacturing Process
With over 20 fully automatic winding machines and a team of expert engineers, our process is optimized for quality, consistency, and speed.
Engineering & Design Review
We collaborate with your team to review drawings and specifications, providing DFM (Design for Manufacturability) feedback to optimize performance and reduce cost.
Custom Tooling & Fixture Creation
Precision-machined winding fixtures are created in-house to match your coil's exact geometry, ensuring dimensional accuracy and flatness from the very first part.
Automated Precision Winding
Our CNC winding machines precisely layer the self-bonding wire onto the fixture, maintaining consistent tension and placement to maximize copper density.
Thermal Bonding & Curing
The wound coil is heated in a calibrated oven. The self-bonding layer activates, fusing the windings into a robust, solid structure.
Quality Assurance & Testing
Every coil undergoes rigorous testing, including checks for inductance, resistance (DCR), dimensions, and hipot (high potential) testing to ensure insulation integrity.
Turnkey Linear Motor Coil Assembly
Beyond winding, we offer comprehensive linear motor coil assembly services to deliver a more complete, plug-and-play solution. This streamlines your supply chain and reduces your in-house assembly burden.
- Lead Wire & Terminal Attachment: Securely attaching and strain-relieving lead wires using ultrasonic welding or soldering.
- Integration with Iron Cores: Assembling the wound coil onto laminated iron cores for iron-core linear motors.
- Potting & Encapsulation: Using thermally conductive epoxies to pot the coil assembly, enhancing heat dissipation and providing protection from moisture and contaminants.
- Sensor Integration: Mounting Hall effect sensors or other positioning feedback devices onto the coil assembly.
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FAQs
Self-bonding wire creates a solid, mechanically stable coil without the need for messy varnishes. This improves thermal conductivity and resistance to vibration, which are critical in high-performance linear motors.
Yes, our process is perfectly suited for ironless (or air-core) linear motors, where the coil’s structural integrity and thermal performance are entirely dependent on the quality of the winding and bonding process.
To provide an accurate quote, we need a drawing or CAD model with dimensions, wire size and type, number of turns, required inductance/resistance, and any assembly or testing requirements.
