Coreless DC motor
maxon RE coreless DC motor
maxon's classic high-performance ironless brushed DC motors; the current catalogue keeps the large RE 50 and RE 65 sizes.
Key specifications
| Outer diameter (max) | 65 mm |
|---|---|
| Continuous torque (max) | 0.888 Nm |
| Speed (max) | 23,000 rpm |
| Power (max) | 250 W |
| Voltage | 18-70 V (RE 65) |
Summarised in our own words from maxon group (maxon motor ag)'s published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3
Notes on this data
Programme page: RE '50 to 65 mm', 0.3-250 W, up to 888 mNm nominal, up to 23,000 rpm - the 0.3 W lower bound is inconsistent with a 50 mm minimum, so od_mm_min left out. RE 65 page: 250 W, ~888 mNm nominal, 5,500 rpm, graphite brushes. Smaller RE sizes absent from 2026/27 TOC (possibly superseded by DCX) - not confirmed.
Specify Motion is not affiliated with maxon group (maxon motor ag). maxon and RE are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
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Our experienced engineers are on hand, ready to help with your project. Whether you need the maxon RE itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
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What a coreless DC motor is
A coreless DC motor has a self-supporting rotor winding with no iron core, typically arranged as a skewed or rhombic basket that spins around a fixed magnet. Without iron in the rotor, there is no cogging, inertia is very low and inductance is small, giving fast acceleration, smooth low-speed running and high efficiency. Coreless designs exist in brushed form, with precious-metal or graphite commutation, and in brushless form. They are usually small, from a few millimetres to tens of millimetres across.
When engineers choose a coreless DC motor
Choose a coreless motor for compact, high-efficiency, highly dynamic drives such as medical devices, surgical tools, laboratory instruments, optics and robotics. Low inertia and no cogging suit smooth precise motion. The trade-offs are thermal capacity and cost: the light winding heats quickly under overload, and coreless motors cost more than iron-core brushed motors. For high continuous torque in a larger size, an iron-core or brushless motor may be more economical.
How to specify the maxon RE
Send these with your enquiry and an engineer can confirm the right RE variant or an equivalent:
- Diameter and length (mm)
- Supply voltage (V)
- Continuous and stall torque (mNm)
- Speed range (rpm)
- Commutation: precious metal, graphite or brushless
- Gearhead and encoder options
- Life and duty cycle
Common mistakes to avoid
- Overloading briefly and overheating the low thermal mass winding
- Choosing precious-metal brushes for high-current start-stop duty
- Ignoring gearhead efficiency and life
- Running without current limiting
maxon RE: frequently asked questions
What is the maxon RE?
maxon's classic high-performance ironless brushed DC motors; the current catalogue keeps the large RE 50 and RE 65 sizes. Published series figures include outer diameter 65 mm, continuous torque 0.888 Nm, speed 23,000 rpm, power 250 W. It is made by maxon group (maxon motor ag); Specify Motion can help source it or propose an equivalent.
Who makes the maxon RE?
The maxon RE is made by maxon (maxon group (maxon motor ag)) and is listed here for engineers comparing options. Specify Motion is not affiliated with maxon group (maxon motor ag); brand names are used only to identify the product.
What is the outer diameter of the maxon RE?
The published series maximum outer diameter is 65 mm. Individual models and sizes in the RE range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the maxon RE?
Yes. Our engineers can propose an equivalent built around your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
What are the advantages of a coreless DC motor?
With no iron in the rotor, coreless motors have no cogging, very low rotor inertia and low inductance. This gives smooth running, fast acceleration and high efficiency. They suit compact, battery-powered and precise applications. The trade-off is limited thermal mass, so overloads must be controlled.
Should I choose precious-metal or graphite brushes?
Precious-metal brushes give low friction and low electrical noise, which suits low current, continuous running and battery devices. Graphite brushes handle higher currents and frequent start-stop duty better. Choose by current level and duty cycle, or move to a brushless coreless design for longer life.
Further reading: How to select a dc motor · Servo and stepper motors
Other coreless dc motor series
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Engineer support
Our engineers are ready to help with your project
Tell us about your project and how you use the maxon RE: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
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