pers/1415/semester1/MEC3015.pdf 2. The table below is extracted from the maxon m
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Question
pers/1415/semester1/MEC3015.pdf 2. The table below is extracted from the maxon motor catalogue and refers to a graphite- brushed DC motor rated at 60 W (part number 268214). a) calculate the torque constant of the motor b) estimate the maximum no-load speed from other suitable parameters given; compare 3 marks] it with the tabulated value and explain potential disagreements 3 marks] [4 marks] d) sketch the speed-torque curves for 12 and 24 V (you may neglect losses). Indicate the c) estimate the friction torque at 8000 rpm region where you would safely run the motor for 15 minutes or more [5 marks] e) draw the block diagram of the unloaded motor including electrical (L&R;) and mechanical parts (inertia and friction). Your diagram will describe the relation between input Vin and output speed . [10 marks] Values at nominal voltage 24 V Nominal voltage No load speed 8810 rpmExplanation / Answer
a)Kn.Km=30000/pi
where Kn speed constant and Km is torque constant
speed constant (Kn)=369rpm/v
therefore 369*Km=30000/pi
Km=9545.45*369
Km=3522272.72
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