After characterizing a few brushed DC motors from the workshop inventory, the results concluded that a slow decay mode in combination with a low PWM frequency will improve most motors' low-speed performance and overall speed range. All motors saw a significant reduction of spin threshold voltage when changing the PWM frequency from the MotorKit library's default of 1600Hz to a more compatible 25Hz. 

The following charts show each motor's speed, power, and spin threshold characteristics measured by the automated motor tester as it swept through decay modes, PWM Equivalent Voltage values, and PWM frequencies. Click on the chart images for an enlarged view.

Yellow TT Motor; 1:48 Gear Ratio

Perhaps you've been assembling a new robot friend, adding a computer for a brain and other fun personality touches. Now the time has come to let it leave the nest and fly on...
$2.95
In Stock

N20 DC Motor with Encoder; 1:50 Gear Ratio

The first step in a robotics project is to get a motor spinning. Once you've done that you quickly learn that not all motors go the same speed, even if they are the same part...
$12.50
In Stock

N20 DC Motor with Encoder; 1:298 Gear Ratio

The first step in a robotics project is to get a motor spinning. Once you've done that you quickly learn that not all motors go the same speed, even if they are the same part...
$12.50
In Stock

Geared DC Motor with Encoder; 1:20 Gear Ratio

The first step in a robotics project is to get a motor spinning. Once you've done that you quickly learn that not all motors go the same speed, even if they are the same part...
$13.50
In Stock

CD/DVD Spindle Motor; RF-300FA-12350

What's this? A record player for ants?? Not at all! This is a DVD/CD Spindle Motor, that thing that's inside a CD or DVD player, that turns the disc...
Out of Stock

This guide was first published on Apr 11, 2021. It was last updated on Apr 11, 2021.

This page (Motor Performance Charts) was last updated on Nov 23, 2021.

Text editor powered by tinymce.