Skip to main content

What is the meaning of the numbers on Brushless Motors?

By
If you go shopping for Brushless motors you will be confronted with a lot of numbers to choose. For an example, you would see motors marked with 3632 22turn 1500Kv, 2213 20turn 920Kv etc. So what does all those numbers mean, and how would you choose? Here's a simple guide...

Let's take this motor for an example,

Turnigy 2213 20turn 1050Kv Outrunner

It's marked as "2213 20turn 1050Kv Outrunner". Let's see what it means.
First of all, it's clearly written that this is an Outrunner motor.

The "2213" indicates the size of the stator,
First two numbers = diameter of the stator = 22mm
Second two numbers = length of the stator stack = 13mm



The "20turn" denotes the number of windings

Finally, there is the "Kv" rating.
Kv is the motors velocity constant. It is measured in RPM per Volt.
In simple terms, a 1050Kv motor running on 3S (11.1V) will produce
                                                                         = 1050 x 11.1 = 11655rpm

Remember never to confuse the Kv rating of a brushless motor to "Kilovolt"!

So, what to choose with all these...
Normally, the larger the size of the stator, more the power the motor will generate.
The number of windings will determine the RPM and the current capacity. The lover the number of windings, the higher the RPM and the current capacity.
Choose these according to your requirements...

One thing to remember is that, although most manufacturers use this numbering method, it's not a standard. So, there may be some out there with different numbering. Just be aware when you buy...

Related posts:
What do the prop size numbers mean?

Related links:
http://aeroquad.com/wiki/index.php/Motors_and_Propellers_FAQ#What_do_all_those_numbers_on_the_outrunner_motors_mean.3F
http://en.wikipedia.org/wiki/Brushless_DC_electric_motor#Kv_rating
Labels:

Comments

  1. Harsha WijesooriyaMarch 21, 2011 at 3:16 PM

    good article. try and find some thrust data for these motors

    ReplyDelete

Post a Comment

Popular posts from this blog

Selecting the Correct Gauge Wires for your RC Models

By
When we are building RC models (aircrafts, multicopters etc.), something we typically overlook is what type of wires to use to distribute power in them. Usually, we try to reduce the weight of the model, so we tend to go with smaller wires. But, we cant expect to put in small circuit-wires and have them handle the amount of power needed. If you look at the wires that comes in the output leads of a Li-Po, or the wires that comes on a standard XT Jack, you'll notice that they're quite huge. Large gauge wires on a Li-Po and XT connectors These need to be huge to handle the amount of amperage that goes through them. So, we should also consider the amperage, and the length of wire needed when selecting the size (gauge) of the wires.
Post a Comment
Read more

What do the prop size numbers mean?

By
Have you been trying to shop for propellers - either online or at a hobby shop - and got confused of the numbering used to denote the size of the propellers? You see things like " 10 x 4.5 CW ", or " 8055 CCW ". What do these numbers mean? A 8 x 4.5 CW and CCW Propeller Set It's actually quite simple once you figure it out. The first number denotes the diameter of the prop (length from tip-to-tip). The second number denotes the pitch of the prop. Here, the pitch is denoted as a length, not a angle. Let's see how that works.
1 comment
Read more

Make Your Own Jupmer Wires for Electronic Breadboard

By
Note: After starting the 'Tips and Tricks' section I wanted to do my own 'tutorial'. So, here's my first attempt of it. Hope you all find this useful, and sorry about the low quality of the photographs, my camera is just a 2MP. If you, like me, like to experiment with electronics, then you'd probably use an electronic breadboard (also known as protoboard or project-board). These allow you to construct and test circuits without the need to permanently soldering the components. The problem with these is that you have to use wires to connect the components across the bus lines. We normally use single core circuit wires for this purpose, but they tend to bend, break and get stuck in the breadboard when used repeatedly. This may cause short circuiting the bus lines and could be the failure of your circuit. A better option would be to buy a 'Breadboard Jumper Wire' kit, such as this. A Breadboard Jumper Wire Kit These have sets of wire of differ
7 comments
Read more