Can you help me on understanding this datasheet of a DC Permanent Magnets motor?
Note that the deleted parts do not add information, they are those not translated into English or referring to other models.
Precisely, my doubt is about current, voltage and rpm of this motor.
Consider the first table with these specifications. You may see that this motor can work at S1 (continuous service) at 100 W and at S2 for 25 minutes at 140W. The supply dc voltage is the same (24V), while current is 8.4A in S2 and 6A in S1.
First question: How can I change the current from 6A to 8.4A or viceversa, to set the power? I have physically this motor, it does not have any switch, potentiometer or other tuning mechanism. The only way I think to reduce power (whose nominal value is 140W) is to lower supply voltage, which is not the method shown in this datasheet.
Second question: I do not understand these numbers. Power computation seems not to be correct.
24 V × 8.4 A = 201.6W (and not 140W)
24 V × 6A = 144W (and not 100W)
Now, let's go to the last graph.
Third question: from this table it seems that I can supply the motor also at 50V, and that it is good to do this since efficiency becomes 1. It seems in contrast with the fact that the nominal voltage has been declared to be 24V in the previous page.
Fourth question: Consider for instance 25V of power supply, which from the table near the graph corresponds to 100W, 2500 RPM and 0.5 efficiency. It seems totally in contrast with the initial table of the previous page, since:
- power was declared to be 140W (S2) or 100W (S1)
- RPM was declared to be 3000