Motors and propellers

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From the course by Autodesk

Manufacturing Process with Autodesk Fusion 360

15 ratings

Autodesk

Manufacturing Process with Autodesk Fusion 360

15 ratings

Course 5 of 5 in the Specialization CAD and Digital Manufacturing

Designing a product is only part of the process. Now, can that product be manufactured? A CNC machinist works with computer numeric controlled (CNC) machines from generating the machine code to machine setup and run. Understanding both CAD and CAM is essential to this portion of a design. Even if you are not the end user who programs a machine, it is invaluable to know how it’s done. This knowledge translates directly to part design by helping make intelligent design decisions with manufacturing in mind. This course introduces you to the integrated CAD/CAM approach behind Fusion 360 CAD/CAM as well as 3D printed design setup and finally assembly and testing. All stages of product design in one place! After completing this course, you will be able to: • Explain the Fusion 360 integrated CAD/CAM manufacturing workflow. • Summarize the trends that are influencing the future of manufacturing. • Demonstrate knowledge and skills in foundational concepts of Fusion 360 CAD/CAM software. • Set up a Flight Controller. • Assemble a quadcopter. • Fly the final design.

From the lesson

Quadcopter Assembly

You finally have a complete design and all the parts in hand, now what? This stage of the process can be a rather large task the first time through. From complex wiring, cable management, and overall assembly, we will step through the process. Even if you aren’t designing and building your own quadcopter, this is great information to have for when you do.

Component tray0:54

Flight Controllers2:27

Power distribution boards3:28

Controllers and receivers1:28

Electronic speed controller2:10

Motors and propellers3:22

Video transmission and remote viewing4:10

Tools and supplies2:25

Meet the Instructors

Autodesk Education

In this lesson, we will review motors and propellers.

After completing this lesson,

you'll be able to identify motor wiring,

and understand propeller variations.

For our quadcopter build,

we used a DYS motor,

a specific motor was meant for FPV racing quads,

but we're using it because of its performance.

There are a few things I want to do when talking about motors.

First, I want to note the direction.

And each motor is going to have arrows on it or dictate which direction it wants to spin.

You can reverse the direction of motors by changing the wiring going into

them but the thread pitch is going to be different on reverse direction motors.

So, two of the motors on our quadcopter are going to have

a right-hand thread and two will have left-hand thread.

It's important to orient them in the direction they're meant to spin,

so you don't accidentally loosen the nuts in flight.

So the specific motor that we're using is an MR2205-2750KV.

Now if you remember, the 22 determine

the diameter of the stator and the five determine the height of it.

So it's a relatively low profile height and it's made for a 250 series racing quad.

That's roughly the size that we're using.

And remember the 2750KV number determine the max RPM.

It's basically a constant velocity number.

So in this case, if we were on this on a three-cell battery system,

we're looking at roughly 30,000 RPM.

If we run it on a four-cell,

we're going up to about 40,000 RPMs.

In addition to the motor,

we need to talk about propellers because there are many different ones on the market.

When we were specking out the motor and the battery system,

we looked at five by four and a half props.

With the black three-bladed prop,

we have a five by four pitch.

With the orange one,

we have a five by four and a half.

And with a three-bladed orange one,

we also have five by four and a half.

There are some important things to note here about propeller choice.

The main thing that we're looking for is the amount of surface area under the propeller.

So, we're using a two-bladed five by four and a half BN prop or bull nose prop.

So, this allows us to get the most amount of

surface area underneath to give us the most amount lift.

The five by four and a half BN three-bladed prop doesn't

necessarily increase the amount of lift we're going to

get because it adds more drag in the air,

and ultimately, what will happen is we get less flight time

because we're spinning a heavier prop and we have more resistance going through the air.

So, out of these three propellers,

the two-bladed five by four and a half which falls in line

with allowing us to use the three-cell on a four-cell battery system,

is going to be the best choice for our application.

If we decide to run a three-bladed prop,

we'll be able to change directions a little bit faster in the air,

but we will sacrifice flight time.

If we decide to use a five by four with this different profile,

we're actually going to get less thrust out of it because we

have less surface area than a BN style prop.

There are lots of different props and different sizes and pitches on the market.

So, it's important that you do your research and

figure out which one works best for your application.

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