Housed direct-drive motor
Akribis Systems AXD housed direct-drive motor
Low-profile housed iron-core direct drive motors with large centre holes and incremental encoders, 80-400 mm frames.
Key specifications
| Outer diameter | 80–400 mm |
|---|---|
| Inner diameter (max) | 130 mm |
| Ingress protection | IP40 |
| Peak torque (max) | 648.9 Nm |
| Continuous torque (max) | 250.6 Nm |
| Speed (max) | 3,000 rpm |
| Weight | 1500-80000 |
| Voltage | 600 VDC bus max |
Series ranges as published; individual models vary. The full datasheet, drawings and CAD models are available on request.
Options
- ABI SIN/COS or TTL incremental encoder (80x/160x/400x)
- ATOM DX encoder
- Series/parallel winding
- Index pulse homing
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 AXD
Send these with your enquiry and an engineer can confirm the right AXD 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 AXD: frequently asked questions
What is the Akribis Systems AXD?
Low-profile housed iron-core direct drive motors with large centre holes and incremental encoders, 80-400 mm frames. Published series figures include outer diameter 80 mm, outer diameter 400 mm, inner diameter 130 mm, peak torque 648.9 Nm. It is available through our supply network, and our engineers can confirm the right variant for your application.
Who makes the Akribis Systems AXD?
The Akribis Systems AXD 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 AXD?
The published series minimum outer diameter is 80 mm. Individual models and sizes in the AXD 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.
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
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