Linear actuators
The universally usable linear drives from Nanotec offer a multiplicity of new, low-priced and powerful possible applications.
- Simple and flexible motor construction considerably reduces system costs
- Stroke-independent movement to any position
- Highly reproducible resolutions (<1 μm) and fast feeds (>1000 mm/sec.) for the same construction volume achieve uniform construction platforms
- Direct force coupling to the load requires no additional components, thus offering rigid and light mechanics
- Static spindles enable highly dynamic and rigid machine constructions as well as multimotor operation
- Due to low energy requirements, even high forces can be delicately regulated
- Partly self-locking so no additional brake is necessary
- Stroke is only dependent on the available spindle length
- Replacement for hydraulic and pneumatic cylinders with considerably higher flexibility
| Series | Size (mm) | Thrust, max. (N) | Resolution (mm/Step) |
|---|---|---|---|
| PM stepper motor Linear actuators | 25-55 | 25-100 | 0.025-0.0417 |
| PM stepper motor linear positioning drives | 8-35 | 3-40 | 0.008-0.01 |
| Linear actuators L20 | 20 | 40 | 0,005 |
| Linear actuators L28 | 28 | 60 | 0.025 |
| Linear actuators with antirotational device L28 | 28 | 60 | 0.025 |
| Linear positioning drives LS28 | 28 | 30-200 | 0,0025-0,1 |
| Linear actuators L41 | 42 | 400 | 0.005 |
| Linear actuators with antirotational device L41 | 42 | 400 | 0.005 |
| Linear positioning drives LS41 | 42 | 400 | 0,005 |
| Linear actuators L59 | 56 | 1000 | 0.01 |
| Linear actuators with antirotational device L59 | 56 | 1000 | 0,01 |
| Archive | |||
Further important information on the use of linear actuators
The achievable resolution, precision feed control speeds and forces are calculated on the basis of the pitch of screw (p in mm), propelling torque
flow characteristics (Md in Ncm) and efficiency as follows:
- Resolution in mm/step =/(360 /step angle) e.g. 1 mm/(360 /0.9 ) = 0.0025 mm/step
- Feed rate = f • resolution, e.g. 2000 1/s • 0.0025 mm = 5 mm/sec
- Thrust in N = MdMot • 2π • efficiency/p, e.g. L5609X approx. 15 Ncm at 2 kHz = 15 • 6.28 • 0.1/0.1 cm = 94 N (peak torque)
- Efficiency = According to DIN 267 - Sheet 1; fine-pitch screw thread approx. 0.1; trapezoidal spindle approx. 0.4; ballscrew spindle approx. 0.9. In addition, the static and rolling friction (0.9 to 0.7), the surface structure (roughness/hardness of the spindle and nut), material pairing (steel/steel), (steel/copper bronze), (steel/POM plastic), pollution severity and concentric spindle guide must be taken into account in the calculation of the service life estimate. It is imperative to determine the operational stability and possible service life in a real trial. (An empirical efficiency for the overall system of approx. 0.3 results for the trapezoidal spindle and approx. 0.7 for the ball screw)
The force and power ratings specified in the datasheets are based on a power-up time of approx. 10% - 20% and must be reduced accordingly for higher values.
The axial play in the direction of the motor is approx. 0.1 to 0.7 mm for 20 N.
With various procedures for surface treatment (e.g. from Balzers, Mifa, Ikos) in the meantime, coefficients of friction can be greatly reduced and the resistance to abrasion considerably improved.
Normally the spindles are wedged or fixed into the moving part.
For all other applications in which this fixing
is not possible or a free spindle end
must move the load, appropriate antirotational
devices are offered by Nanotec and delivered
in part already mounted on the motor. (The displacement distance must then be specified.)
Linear adjusting mechanisms and movements
are a frequent task definition for many
constructors. For quite some time the
linear actuator and stepper motor family L....
has been successfully deployed in numerous applications
(such as control, dosing, leveling, stroke,
positioning, adjustment and closing tasks,
path independent pressure and tractive force
adjustment and many more)
due to their versatility as related to force
and positioning speeds.
