Mini DC Brushed Motor

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Most common locations where you'll find these motors include inside children's toys. Mini brushed motors possess very small torque and high speed of rotation, making them ideal for lightweight car toys, boat toys, small USB fans, electric toothbrushes, and as a key component in small gearmotors. As the name suggests, gearmotors are simply brushed motors combined with multiple gears. The purpose here is to reduce the speed of rotation and consequently increase the torque of the output shaft. A great learning project would be to use a mini brushed motor and build your own set of gears, attach them to the shaft, and experiment with the output torque and speed - don't forget to grease the gears to minimize noise and maximize efficiency. Common operating voltages for these motors include 3V, 6V, and 12V. As with other motors, it's good practice to separate the current source from the rest of the electronics to avoid damage caused by back emf. They typically draw 0.3 A - 0.6 A, but stall current can reach as high as 1.7 A, which should be taken into account when selecting a motor driver. Unloaded speed of these motors usually falls somewhere around 12,000 RPM and 18,000 RPM; the speed will decrease when the motor shaft is loaded, and drop even more when traction force from water or the ground is present. The shaft is typically 8 mm long and 2 mm in diameter. A simple press technique is sufficient to join the wheel or propeller with the shaft because these components are likely made of relatively soft plastic.