Housed direct-drive motor
Akribis Systems ACW housed direct-drive motor
Flat, low-profile ironless direct drive motors with large centre holes, zero cogging and high-resolution optical encoders.
Need this part, a replacement or a complete package? Our experienced UK engineering team helps you select, source and obtain the right products, with pricing, delivery coordination and after-sales support.
Pricing and availability
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Need Akribis Systems parts, a replacement or a suitable alternative? Send us a part number, or tell us what the machine needs to do. Our UK engineers will come back with the right product, pricing, lead time and delivery, whether that is the original part, a checked alternative or a complete axis.
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- Pricing, lead time and delivery in one reply
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No obligation. Add what you know and an engineer will help with the rest. Prefer to configure it? Build a specification.
Spec builder
Configure Akribis Systems ACW
Select every part you need and answer the questions an applications engineer would ask. Our engineers use your specification to come back with the right products, pricing and lead times. You see your summary before we ask for any details.
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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
| Outer diameter | 120–220 mm |
|---|---|
| Inner diameter (max) | 70 mm |
| Ingress protection | IP40 |
| Peak torque (max) | 35.9 Nm |
| Continuous torque (max) | 7.4 Nm |
| Speed (max) | 400 rpm |
| Weight | 2000-7000 |
| Voltage | 330 VDC bus max |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Akribis Systems ACW replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Akribis Systems part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
In-runner frameless torque motors from 65 to 410 mm stator OD with 8-64 poles, low profile and large through-holes; windings tailored to target speed.
| Published maximum | ACW | TI Series In-Runner Frameless Direct D… |
|---|---|---|
| Continuous torque | 7.4 Nm | 70 Nm meets or exceeds |
| Peak torque | 35.9 Nm | — |
| Speed | 400 rpm | — |
Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.
Akribis Systems ACW model codes
Published model codes in the ACW 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 | Outer diameter (mm) | Pricing / replacement |
|---|---|---|
| ACW120 | 120 | Quote or replacement for ACW120 → |
| ACW170 | 170 | Quote or replacement for ACW170 → |
| ACW220 | 220 | Quote or replacement for ACW220 → |
Options
- SIN/COS optical encoder
- 80x/160x/400x interpolation
- Optional P5/P10 runout grade
Typical applications
What a housed direct-drive motor is
A housed direct-drive motor is a high-pole-count permanent-magnet torque motor supplied in a complete housing with its own bearings, typically a precision cross-roller or similar bearing, and a high-resolution encoder. The load bolts directly onto the rotor face or shaft, with no gearbox or belt between motor and load. Many designs have a large hollow centre. They are run by a servo drive and provide high torque at low speed with very high stiffness and accuracy.
When engineers choose a housed direct-drive motor
Choose a housed direct-drive motor for rotary tables, indexers and turntables that need high accuracy, fast indexing and no backlash, without the integration effort of a frameless motor. It is ready to mount. The trade-offs are cost and size: direct drive needs a large motor for high torque, and the bearing and encoder are set by the range. Where torque needs are high and accuracy moderate, a servo with a precision gearbox may be cheaper.
How to specify the Akribis Systems ACW
Send these with your enquiry and an engineer can confirm the right ACW variant:
- Continuous and peak torque (Nm)
- Speed (rpm)
- Load inertia and moment load (kgm², Nm)
- Axial and radial load capacity (N)
- Encoder type and resolution
- Through-hole diameter (mm)
- Bus voltage and drive compatibility
Common mistakes to avoid
- Ignoring moment loads from offset tooling
- Mismatching encoder interface and drive
- Overlooking thermal effects on accuracy
- Expecting high torque without a large frame
Akribis Systems ACW: frequently asked questions
Can you help replace Akribis Systems ACW 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 ACW?
Flat, low-profile ironless direct drive motors with large centre holes, zero cogging and high-resolution optical encoders. Published series figures include outer diameter 120 mm, outer diameter 220 mm, inner diameter 70 mm, peak torque 35.9 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 ACW range?
The ACW range includes ACW120, ACW170, ACW220. 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 ACW?
The Akribis Systems ACW is made by Akribis Systems available through our supply network. Send us your requirement for pricing, lead time, datasheets and CAD.
What is the outer diameter of the Akribis Systems ACW?
The published series minimum outer diameter is 120 mm. Individual models and sizes in the ACW 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 ACW?
We can assess suitable replacement options. On published figures, Motion Control Products TI Series In-Runner Frameless Direct Drive Torque Motors is options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
When should I choose a direct-drive rotary table instead of a geared one?
Choose direct drive when you need high accuracy, fast settling, no backlash and low maintenance, especially for indexing and inspection. Choose a geared solution where torque requirements are high and cost must be controlled. Direct-drive motors are larger for the same torque.
Do housed direct-drive motors need a brake?
Not always. Horizontal tables often hold position under servo control. Vertical axes, unbalanced loads or safety requirements may need a brake or clamp. The machine's risk assessment determines whether a holding brake or clamp is required, and brake or clamp options vary between ranges, so confirm availability early in the design.
Further reading: How to select a frameless torque motor · Frameless and torque motors
Often compared with
Engineers specifying this series often compare it with:
Other housed direct-drive motor series
Engineer support
Need Akribis Systems ACW or a complete system around it?
Tell us the part or application, quantity and timing. Our UK engineers will come back with the right product, pricing, lead time and delivery.
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Prefer to configure it? Use the spec builder.
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.