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Gearhead Selection

Learn how to select the best gearhead for your application needs with Dr. Urs Kafader of the maxon academy.

Topics:
Automation Robotics

More From SAE Media Group

    Transcript

    00:00:07 this video tutorial shows you how you can find a suitable gear head based on the speed and torque requirements of your application starting point for gearhead selection is the application more precisely the motion of the load the necessary operation cycles speed profiles and friction result in speed and torque requirements the drive has to fulfill in

    00:00:31 our standard diagram with motor speed as a function of torque this can be represented as points of operation for example a constant operation that the given torque and speed for maintaining a position against some external force at zero speed or speeding up a mas inertia usually that's where the highest torque occur the use of a gear head is advisable if the speed is low typically

    00:00:59 well below 1000 rpm and the torque is relatively high regarding torque we condense all the operation points into a few key values the average RMS load torque and the extreme operation point usually at the end of the acceleration where the maximum load speed at the maximum load torque occur let's take specific values as an example

    00:01:25 we assume that we need to Newton meter continues torque and 4.7 Newton meter maximum torque for a quick acceleration 267 rpm a good overview of the rated torque of Max and gearheads offers the selection guide in the catalog the red bars indicating the torque capabilities with respect to the scale at the bottom the smaller gear heads at the top of the

    00:01:51 lists are too weak the continuous torque rating is too small in the lower part one finds the larger and stronger gears with sufficient continues torque the maximum intermittent torque of the gear head are about 50% higher than the continuous ones the required peak torque is relatively large here however the cheapy 26a for instance is one of the gear head types matching also

    00:02:17 these requirements let's investigate this GP 26a in more detail first thing to note is that for this gearheads there are different reduction ratio as possible each has a different order number the lowest reductions based on one gear head stage can be found on the left the highest reduction here with three stages are on the right most columns we observe that

    00:02:45 the torque capabilities increase with increasing number of stages our application requires two Newton meter continues that could be covered by two stages or more however the short-term peak load can only be covered by a gear head with at least three stages they have efficiencies of 70% essentially we selected the gearhead type a number of stages according to the

    00:03:13 torque requirements of our application but now which is the best reduction ratio to choose as a general rule one can state that the highest possible reduction gives the lowest motor torque the lower the motor torque the more chances we have to find a suitable mode to later on the highest possible reduction is limited by the input speed of the gear head you can

    00:03:37 find this value in the upper right corner for our gearhead it is 8,000 rpm it means that the motor speed should not exceed 8,000 rpm for this gear head in order to obtain a load speed of 67 RPM the reduction ratio of the gear head should not exceed 8,000 divided by 67 it is 120 to 1 the next smaller gearhead reduction available is 100 to 1 and that stickier

    00:04:07 head we're looking for up to this point we have considered the speed and torque limitation of gearheads however it's the combined effect of speed and torque the transmitted power that is related to service life the higher the transmitted power the lower the life expectancy therefore it's reasonable to limit the transmitted power as well the

    00:04:31 corresponding values are given for the new remarks and gearheads putting all this together we can draw an operating range diagram for a gearhead it looks similar to the one shown here if all the reduction values of a gearhead type are to be represented a diagram with logarithmic scales is more appropriate that's what you find on the maximum GPX series

    00:04:57 in addition to these considerations about torque and speed there are other criteria for the selection of gearheads the first one being the mechanical interface how is the key rate going to be fixed and how about the shaft diameter and length is there flat or even a key ray needed for connecting the load how large or radial and axial load on the shaft check the maximal Euler

    00:05:23 system for suitable motor types in combination with this particular gear head is it possible to find matching motors which sufficiently high torque in our case the RMS motor torque amounts to about twenty-eight million Newton meters particular conditions requires special Kiryat types sterilizable versions gives with specially high torque or high input

    00:05:47 speed heavy duty versions for high pressure vibration and temperature and other special gear heads that's it a short introduction to gearhead selection in summary first select the gearhead size and type according to the torque requirements of your application the matching reduction ratio is found by looking at the load speed and Maxim deerhead input speed

    00:06:14 good luck