RDM-A Series – Rod Motor Linear Motor
The RDM-A Series is a compact ironless rod linear motor designed as a direct drive alternative to conventional ball screw mechanisms. It provides zero cogging, smooth non-contact motion and continuous force ratings from 2.1 N to 137.8 N, with multiple coil and magnetic track configurations available.
The RDM-A Series Rod Linear Motor, also known as a shaft motor, is a compact direct drive solution designed for precise linear motion. Its cylindrical magnetic track and closely arranged round coils create a symmetrical motor construction with efficient use of the available magnetic flux.
An air gap between the motor coil and magnetic track enables non-contact linear movement. The ironless design produces no cogging or magnetic attraction force between the coil and track, supporting smooth motion, precise force control and simple mechanical assembly.
The RDM-A Series provides continuous force ratings from 2.1 N to 137.8 N and peak force ratings from 6.2 N to 413.4 N. Motor sizes range from a 20 mm-wide coil with an 8 mm-diameter shaft to a 60 mm-wide coil with a 30 mm-diameter shaft.
Multiple coil lengths, magnetic track lengths and stroke options are available. The system can also support multiple independently controlled movers on a single magnetic track, providing a flexible solution for compact machine designs and multi-position processes.
Its slim, ball-screw-like shape makes the RDM-A suitable for replacing conventional mechanical transmission systems where smooth motion, high speed and a compact installation envelope are required.
Typical Applications
- High-speed printing equipment
- Biomedical equipment
- Semiconductor manufacturing machinery
- CNC and wire-cut EDM machines
- Single and multi-axis positioning modules
- Counterpoint platforms
- Z-axis pick-and-place modules
- Precision force-control systems
Need help selecting the right rod linear motor?
Micromech’s experienced engineers can help you select and size the appropriate RDM-A motor coil and magnetic track for your required force, travel, speed and installation arrangement.
Features
- Compact rod-style linear motor design
- Direct drive linear motion
- Ironless motor construction
- Zero cogging force
- No magnetic attraction force between the coil and track
- Smooth and precise motion
- Efficient use of magnetic flux
- Non-contact axial movement
- Continuous force ratings from 2.1 N to 137.8 N
- Peak force ratings from 6.2 N to 413.4 N
- Motor coil widths from 20 mm to 60 mm
- Magnetic shaft diameters from 8 mm to 30 mm
- Multiple coil lengths available
- Wide choice of magnetic track lengths and strokes
- Supports multiple movers on a single magnetic track
- Flexible motor coil and track configuration
- Simple mechanical assembly
- Compact alternative to ball-screw transmission systems
- Suitable for high-speed positioning and precision force control
- Reduced mechanical wear and maintenance requirements
Specifications
The RDM-A Series is available in four frame sizes with multiple coil and magnetic track options.
| Series | Available coil variants | Coil length range | Continuous force range | Peak force range |
|---|---|---|---|---|
| RDM020-A | B2–B4 | 31–61 mm | 2.1–4.1 N | 6.2–12.4 N |
| RDM030-A | B2–B4 | 61–121 mm | 12.4–24.8 N | 37.2–74.5 N |
| RDM050-A | B3, B5 and B7 | 56.8–131.2 mm | 25.8–60.2 N | 77.4–180.6 N |
| RDM060-A | B4–B6 | 145–217 mm | 91.9–137.8 N | 275.6–413.4 N |
| General specification | Details |
|---|---|
| Motor type | Ironless rod or shaft linear motor |
| Motor coil width range | 20–60 mm |
| Magnetic shaft diameter range | 8–30 mm |
| Cooling method | Natural cooling |
| Cogging force | Zero |
| Magnetic attraction force | Zero |
| Motion arrangement | Motor coil or magnetic track can act as the moving element |
| Multi-mover capability | Multiple movers can operate on one magnetic track |
| Insulation class | Class B (130°C) |
| Protection rating | IP00 |
| Operating temperature | 0°C to 40°C, non-freezing |
| Storage temperature | −15°C to 70°C, non-freezing |
| Operating humidity | 10% RH to 80% RH, non-condensing |
| Storage humidity | 10% RH to 90% RH, non-condensing |
| Compliance | CE and RoHS |
Electrical characteristics, coil mass and available magnetic track lengths vary by motor size and coil configuration. Refer to the RDM-A catalogue section for detailed model data.
Certifications
- CE compliant
- RoHS compliant
Downloads
Detailed RDM-A Series specifications, dimensions, force-speed curves, magnetic track options and ordering information.
