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Coreless Electric Motor

A coreless electric motor swaps the iron-core armature for a hollow, self-supporting copper winding, cutting rotor mass and removing cogging torque for faster acceleration and smoother low-speed running.

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Advantages

Why Engineers Choose Coreless DC Motors

  • Low rotational inertia

    Fast start/stop cycles and quick direction reversal suit any mechanism that has to change motion state repeatedly. brushed DC motors brushless DC motors

  • Cog-free winding

    Smooth, precise low-speed motion matters in dosing pumps, optics, and other fine-positioning tasks.

  • High efficiency at low voltage

    Draws less idle current than an iron-core motor of the same size, a real factor in battery-powered devices.

  • Compact envelope

    Compact envelope frees up space in tightly packaged assemblies without giving up power-to-weight ratio, and every coreless line comes as brushed or brushless.

Specifications

Coreless Motor Specs

Coreless motors come in four diameter classes, each supplied motor-only or paired with a gearbox. The table below gives datasheet reference figures for representative models, covering size, voltage, speed, torque, current, and gearbox options. DC brush motor guide brushless motors explained DC electric motor guide

Diameter ClassRepresentative ModelRated Voltage (applied range)SpeedTorqueCurrentGearbox Options
10mm (micro coreless dc motor)10mm brushed coreless gear motor3–12V49–612 rpm rated (ratio 20:1–250:1)0.02–0.29 kg·cm rated—Spur gearbox 6–9mm long; planetary + encoder version at 3–24V
12mm (mini coreless motor)12mm brushed coreless planetary gear motor BLC122112V (3–12V)10–1,280 rpm rated (4 tiers)3.7–3,000 g·cm rated, up to 7,500 g·cm stall20 mA no-load / 120 mA ratedPlanetary Φ12×L14.3; parallel-shaft, 90° shaft and worm variants; brushless + encoder
16–17mm16mm brushed coreless motor BLC1625 · 16mm 1636 brushless coreless motor4.5–12V windings (6–48V) · 12V/24V windings5,300–8,900 rpm rated (brushed) · 10,000 rpm rated (brushless)15–21 g·cm rated, 90–170 g·cm stall (brushed) · 32.6 g·cm rated (brushless)180–400 mA rated · 180–390 mA ratedPlanetary 14:1–1621:1, up to 32.42 kg·cm rated
22mm22mm brushed coreless motor DM223200124V (6–24V)7,150 rpm no-load / 5,700 rpm rated465 g·cm stall14 mA no-load max / 380 mA rated max / 2.0 A stallPlanetary Φ22×L30, 9 rpm output, 60 kg·cm stall; brushless coreless version at 6–48V

Diameters and voltages outside this range can still be built: pair a coreless core with Planetary Gear Motors, Spur Gear Motors, or a worm gear motor train, and tell us the reduction ratio and output shaft you need.

Options

Customization Options

Customize feedback, materials, motion type, reduction stage, and integration to match your build.

  • Feedback

    Pair with an encoder, Hall sensor, or sensorless build depending on whether you need closed-loop position feedback or simple open-loop speed control.

  • Materials

    Choose brass, stainless steel, powder-metallurgy alloys, or engineering plastic for housings and gears, matched to load and operating environment.

  • Motion Type

    Straight-line motion needs a different mechanism than rotary output, and for step-wise positional holding a Motion Type may suit better than a coreless build.

  • Reduction Stage

    Planetary stages add backlash that increases with each reduction stage, so factor that into positioning tolerance before locking a gearbox choice.

  • Integration

    Encoder mounting, PCB soldering, and wire harness assembly are handled in-house rather than sent to a third party.

Backlash grows with each reduction stage, as covered in the planetary gear motor guide.

Applications

Coreless DC Motor Applications

Robotics and Automation

Coreless DC motors support grippers, compact joints, positioning stages, and other automated mechanisms requiring fast response.

Their low rotor inertia helps deliver quick acceleration, smooth movement, and precise positioning within space-constrained assemblies.

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Medical Devices

Coreless motors can power dosing pumps, diagnostic instruments, and other compact medical mechanisms where smooth motion is important.

Their compact size, low weight, and low-noise operation make them suitable for precision devices with limited installation space.

Explore Medical Equipment Applications
Smart and Portable Equipment

These motors fit smart devices, precision equipment, handheld tools, and portable systems where both weight and available space are constrained.

Motor speed, torque, gearbox ratio, and envelope can be matched to the operating requirements of the final device.

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Right-Angle Drive Systems

The 12mm 90-degree and worm-geared coreless units suit equipment where the motor and output shaft cannot be arranged in a straight line.

Their compact right-angle layout helps integrate geared motion into narrow housings and space-limited mechanisms.

View Right Angle Gear Motors
Overview

Quality & Manufacturing

SLW Motor runs a 2,400 m² factory in Shenzhen with 56+ staff and 15+ years of R&D experience, including projects for Japanese manufacturing clients, serving buyers across 30+ countries.

Every coreless motor passes incoming, in-process, and final inspection for dimensional and performance consistency, and production is ISO 9001:2015 certified with RoHS and Halogen-Free reporting available on request.

10–22mm band

Coreless Motor Configurations, 10–22mm

Configurations

SLW builds coreless motors most heavily in the 10–22mm diameter band, where medical, robotics, and automation sourcing requests concentrate. Every size is available as a bare motor or as a coreless gear motor.

Available Options

  • Brushless coreless motor: 12mm, 16mm and 22mm frames for brush-free service life
  • Coreless gear motor: every size available with gearing
  • Bare motor: every size available without gearing
Sizes & Specifications

Coreless Motor Size & Spec Range

Compare representative coreless motors across 10mm, 12mm, 16–17mm and 22mm diameter classes. The figures below are datasheet values for the listed models and windings; final voltage, speed, torque and current depend on the selected winding and gear ratio. Other configurations can combine a coreless motor with planetary gear motors, spur gear motors or a worm gear motor train.

Get a Quote

Get a Custom Coreless Motor Quote

Tell us the diameter, voltage, torque, speed, and output shaft your assembly needs, and whether you're ordering a handful of samples or planning for bulk.

  • MOQ

    set per configuration, not a fixed catalog minimum — confirmed with your quote.

  • Sample and production lead times

    Confirmed at quotation; production scheduling is optimized for stable, on-time delivery across both small-batch and bulk runs.

  • Datasheets and 3D files

    Available on request through the quote form — include your target diameter, voltage, and gear ratio so the right file gets sent back.

SLW's engineering team replies with fast quotation feedback and can build to a catalog configuration or a fully custom print. Request a quote to start.

FAQ

Frequently Asked Questions

Find quick answers on coreless DC motors, customization, and how we support OEM programs from sample to volume.

What does a coreless motor mean?

It's a DC motor whose rotor winding has no iron core — a self-supporting copper coil wound around a stationary magnet instead of iron laminations.

Are coreless motors more expensive?

Usually yes, per unit — the self-supporting winding costs more to manufacture than a wound iron core. Whether that premium is justified depends on how much idle-current savings and response time matter for your duty cycle.

What is the difference between a coreless and a cored DC motor?

A coreless rotor has no iron core, so it reduces iron losses, heat, and inertia compared with a cored motor. A cored motor winds copper around a laminated iron core. A coreless motor winds copper into a self-supporting shell with no core, changing the rotor's mass distribution and manufacturing cost.

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