![]() ![]() Now that you understand the specifications that distinguish motors, you can work on choosing a motor and gear ratio for your application. As the load on the motor (the torque) increases, the amount of current that the motor draws increases linearly. The motor’s current draw is the amount of electrical current the motor draws at any given load. It is usually measured in N-m when metric units are required and oz-in when English units are required. Other motor characteristics are commonly written as a function of torque. If too much torque is applied to a motor, its output shaft will stall, or stop turning. These characteristics are interdependent and can all be derived from four values: the motor’s stall torque, stall current, free current, and free speed.Ī motor’s output torque is the amount of force with which its output shaft can rotate. They are the motor’s output torque, its current draw, its output speed, its power, and its efficiency, each of which I will discuss in turn. There are several important characteristics of motors that provide information about a motor and its capabilities. PrerequisitesĪ basic understanding of physics – e.g. This tutorial was made through the Autodesk FIRST High School Intern program. ![]() Finally, I will demonstrate how to use what you learn in this tutorial in an example problem and point out extra tools and resources if you want to learn more. I will then provide information about choosing a gearbox, followed by an overview of the motors and gearboxes available in FRC. Next, I will discuss how to choose a motor and gear ratio given application requirements. ![]() First, I will teach you about motor characteristics. This tutorial will teach you the fundamentals of gearbox design and implementation. Without appropriate motor-gearbox combos, your team will find that your robot does not function as quickly and effectively as intended, and may have a tendency to burn out motors. Why Spend Time Choosing the Right Motor and Gearbox?Ĭhoosing the correct combination of a motor and a gearbox for a given application is very important, both in the FIRST Robotics Competition (FRC) and in actual engineering projects. ![]()
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