gearbox - FAULHABER - DC Motors & Micro Drive Systems
classic bell-type armature motor with ironless rotor coil and precious metal commutation provides very favourable preconditions for such areas of application. The small, light-weight DC drives gearbox gearbox - FAULHABER - DC Motors & Micro Drive Systems work reliably in adverse environmental conditions. They
are ideally suited for ambient temperatures between
–
30 Gearbox Software - Welcome °C and + 125 °C. With special design features, they are even able to deal with high levels of
humidity of up to 98%. For gearbox PI, an important consideration in the selection of motors was the immediate
and high torque start-up of the DC motors after a
voltage is applied. This ensures direct reaction
to the control signal. Thanks to the self-supporting copper coil, it is possible to construct particularly light motors with efficiency grades gearbox of
80 %
and more.
Depending on the design and area of application, the hexapod micropositioning system combines DC motors with reduction gears. The low-play cylindrical gearing in an all-metal design is gearbox particularly conducive to uniform and low-noise operations.
To avoid backlash, in most cases the gears are pre-tensioned. Motor and gears form gearbox a compact unit and are 60 mm long at a diameter of less than 25 mm. So even at rather tight installation ratios in the hexapod axes, the drive units gearbox can be easily integrated. Electrical connection is also particularly user-friendly.
The DC geared motors can be controlled directly by PC cards without additional boosters. In some cases, however, manufacturers of hexapod micro-positioning systems have incorporated servo-boosters with inputs for pulse-width modulated signals, close to the motor in the basic board of the hexapods.
Position detection with magnetic pulse generators
For precise positioning, it is ab-solutely essential that one knows the actual position of the motors. Once again, FAULHABER came up with an effective solution. With the DC micromotors built into the hexapods, the current positions are recorded with magnetic pulse generators supplying 512 pulses per rotation. Resolutions of up to 0.005 µm are produced by means of quadruple interpolation, depending on spindle pitch.
The pulse generators consist of a multiple-pole, low-inertia permanent magnetic disk, which is in-corporated either on the motor shaft or directly into the rotor of the motor, depending on the type of unit deployed. Magnetic sensors record the changes in magnetic flux. The output includes two 90° phase-shifted incremental output signals, which are sub-sequently processed by the system control of the hexapods. The supply voltage for pulse generators and the DC micromotor as well as the output signals are connected via a ribbon cable by means of a plug.
Parallel vs. serial kinematics
In kinematics, one can basically distinguish between parallel and serial kinematics. In serial systems, each actuator focuses on its own positioning platform and is assigned to one axis. This approach allows simpler mechanical structures and control technology.
However, as runout errors tend to add up with the "stacked" systems, the de-gree of precision achieved is lower than with parallel systems. With parallel kinematics, unlike serial kinematics, all actuators act directly on
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