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Choosing the Right Size DC Motor

Motors are used everywhere – from power windows to machine tools, DVD players, household appliances, and robust industrial engines. However, considering the many choices and variables, choosing a DC motor may not be easy.

Choosing a DC motor is crucial to determine what voltage is appropriate for the application and what physical size the motor needs. Once these first two parameters establish, they can consider speed and torque.
If you find choosing a suitable DC motor for your application challenging, we have a guide to help you with the selection process.

Voltage availability

One of the critical elements you need to consider while selecting your DC motor is voltage availability. For example, several rack-mounted devices and tools operate on a 24V power supply, while remote applications or portable devices use batteries. As a result, DC motors can use voltages as low as 1.5V. And as high as 48V, depending on the power required.


Motors are powered by the current, and too much current will damage them. DC motors have an operating current and a stall current. While the former is the average amount of current the motor expects to draw under typical torque, the latter applies enough torque for the engine to run at 0 RPM.

Physical size

Since more and more applications, such as desktop 3D printers, portable medical devices, and hand tools, have small footprints, physical size is often one of the limiting factors in motor selection. It is necessary to compromise between which motor to use and the available space to use it. Efficiency becomes a primary concern when battery life is at stake in a surgical tool or security drone.

Speed and torque

Motor frame size is also affected by torque and speed. Motors with high torque are often larger than their counterparts with low torque. Therefore, mounting hardware in a larger housing may be essential. For instance, a peristaltic pump application may require a stronger motor than the motor of a computer fan.

Even though torque and speed are independent requirements in many applications, typically, the speed reduces, assuming the voltage stays the same when the torque increases.

Motor duty cycle

The motor duty cycle can be a good indicator of semiconductor machine performance, reduce the wear and tear on the motor, and increase its life. Furthermore, the intermittent operation allows for a smaller motor size to use without depleting the positive characteristics of the machine.

You can avoid costly mistakes by developing clear project parameters and understanding the available motors. While selecting an engine, you may want to consider some of this essential information. For example, to choose the right type of motor, you should consider the application’s purpose and current use. In addition, be sure to pay attention to the requirements for your project, such as velocity, torque, present, and voltage.

If you have never worked with motors before and have no idea what to do, then you are at the right place. Visit our website to select DC motors you could choose from for your application or project.

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