Hello, I am doing machine design homework and I am not sure if I answered the qu

Question

Hello, I am doing machine design homework and I am not sure if I answered the questions correctly. I think the answer to the first question is speed, output power, current, and efficiency. Currently trying to figure out the graph. I can use some help. Thanks!

Answer the following questions. 1. What determines the torque produced by a DC motor'? 2. A particular gear motor has the following specifications: no load speed 85 rpm, no load current = 0.06A; rated operating = 40 rpm, 400m N-m 0.6A. Create the speed-torque curve, torque-current curve, power-torque curve, and determine the operating point (speed, torque) for maximum efficiency based on a 12V DC input voltage. The graphs can be placed on a single graph or multiple graphs, but torque should always be the independent variable on each graph. Be sure to label your axes and include units. You can do the graphs in Excel or Matlab (or by hand), but you must include a description/calculations of how you created them from the data provided.

Explanation / Answer

1.The input of a DC motor is current or voltage and the output is Torque(speed).The torque in a DC motor is generated by a current carrying conductor placed in a magnetic field.Mainly the torque of a DC motor depends on the Lorentz force that the current carrying coil experience.

F=i(lxB)

where i=current through the coil

l=lenght of the current carrying coil

B=magnetic field passing through the coil

Along with the current, the torque also depends on the magnetic field strength.

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