Ironless linear motor
Akribis Systems ACR ironless linear motor
Curved (arc-segment) ironless motors for limited-angle or 360-degree rotary motion on large radii, zero cogging and zero attraction force.
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Pricing and availability
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- 1Products
- 2Performance
- 3Environment
- 4Volumes
- 5Your spec
What are you specifying?
Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Peak torque (max) | 1,382.2 Nm |
|---|---|
| Continuous torque (max) | 460.7 Nm |
| Voltage | 600 VDC bus max |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Engineer support
Speak to our engineers about your project
Our experienced engineers are on hand, ready to help with your project. Whether you need the Akribis Systems ACR 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.
- Help sourcing ACR and spares for installed machines
- Modified and custom designs when a catalogue part doesn't fit
- Complete axis: motor, drive, gearing and feedback matched together
Akribis Systems ACR model codes
Published model codes in the ACR range, with key figures from the manufacturer's data. Search this page for your part number, or send it to us for availability, pricing and lead time.
| Model code | Continuous torque at 100 °C (Nm) | Peak torque (Nm) | Pricing / replacement |
|---|---|---|---|
| ACR240-S5 | 19.8 | 72.8 | Quote or replacement for ACR240-S5 → |
| ACR335-S5 | 92.3 | 276.9 | Quote or replacement for ACR335-S5 → |
| ACR820-S5 | 331.5 | 994.5 | Quote or replacement for ACR820-S5 → |
| ACR1240-S5 | 334.95 | 1202.4 | Quote or replacement for ACR1240-S5 → |
| ACR1525-S5 | 460.7 | 1382.2 | Quote or replacement for ACR1525-S5 → |
Options
- Integrated Hall sensor
- Temperature sensor
- Multiple track arc angles
Typical applications
What an ironless linear motor is
An ironless linear motor, also called a coreless or U-channel linear motor, has a coil assembly with no iron, typically encapsulated in epoxy, moving inside a U-shaped channel lined with magnets on both sides. With no iron in the moving part, there is no cogging and no magnetic attraction between forcer and track. The forcer is light, so acceleration can be very high. Like other linear motors, it drives the load directly and relies on a linear encoder and external guides.
When engineers choose an ironless linear motor
Choose an ironless linear motor for very smooth motion, constant velocity and fast settling with light to moderate loads, such as scanning, metrology, semiconductor and inspection. The trade-offs are force density and heat: without an iron core, continuous force per size is lower and the coil has less thermal mass. The U-channel track is also bulkier and more expensive per metre. For heavy loads or high continuous force, an iron-core design is usually more economical.
How to specify the Akribis Systems ACR
Send these with your enquiry and an engineer can confirm the right ACR variant:
- Peak and continuous force (N)
- Moving mass and payload (kg)
- Velocity ripple or smoothness requirement
- Stroke and speed (mm, m/s)
- Settling time and positioning accuracy (ms, µm)
- Thermal limits and cooling
- Encoder type and resolution
Common mistakes to avoid
- Using peak force for continuous duty and overheating the coil
- Ignoring cable management on a moving coil
- Assuming guides can be lighter without considering stiffness
- Choosing ironless where an iron-core motor would provide more force for less cost
Akribis Systems ACR: frequently asked questions
Can you help replace Akribis Systems ACR or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Akribis Systems ACR?
Curved (arc-segment) ironless motors for limited-angle or 360-degree rotary motion on large radii, zero cogging and zero attraction force. Published series figures include peak torque 1,382.2 Nm, continuous torque 460.7 Nm. It is available through our supply network, and our engineers can confirm the right variant for your application.
What model codes are in the Akribis Systems ACR range?
The ACR range includes ACR240-S5, ACR335-S5, ACR820-S5, ACR1240-S5, ACR1525-S5. The table on this page lists each published model code with its key figures. Send us the code you use, or the one you need to replace, and our engineers will confirm availability, lead time or the closest equivalent.
Who makes the Akribis Systems ACR?
The Akribis Systems ACR is made by Akribis Systems available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the peak torque of the Akribis Systems ACR?
The published series maximum peak torque is 1,382.2 Nm. Individual models and sizes in the ACR 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 Akribis Systems ACR?
We can assess suitable replacement options. Our engineers can review the original model and propose options for your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
Why do ironless linear motors have no cogging?
Cogging comes from iron being attracted to individual magnets as it passes over them. An ironless forcer has no iron in the moving part, so there is nothing to be pulled towards the magnets and the force is smooth. This gives very low velocity ripple, which suits scanning and precise constant-speed motion.
Are ironless linear motors less powerful?
For a given size, ironless motors typically produce less continuous force than iron-core motors and have less thermal mass to absorb heat. Their light forcers allow very high acceleration, so the moving system can still be very dynamic. For heavy loads, iron-core motors are often more economical.
Further reading: How to select a linear motor · Linear actuators
Often compared with
Engineers specifying this series often compare it with:
Other ironless linear motor series
Engineer support
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How it works
From enquiry to delivery
Send a part number or describe the application. Our engineers take it from there: the right product, a clear quotation, and delivery and support arranged.
- 01Tell us what you needSend a part number, or configure the application, quantities and timing.
- 02An engineer reviews itWe check the specification and find the original part, a checked equivalent or a complete axis.
- 03Receive your quotationProducts, pricing, lead time and compatibility notes in one reply.
- 04Order and deliveryWhen you are happy, the order is placed and delivery and after-sales support are arranged.