More power in a small package
Electric motors were one of the areas where manufacturers are squeezing more power in less space. Examples included these two units from Micromo. At top is the 1727 CXR dc motor. Higher power comes from the use of a neodymium magnet, giving the graphite‐commutated motor a high power density with a continuous torque of 4.9 mNm. The housing that is 17 mm in diameter and 27 mm long. The temperature range is from ‐30 to +100°C.
The bottom slightly larger motor is a 2668 CR, which Micromo says is the most powerful copper‐graphite commutated dc motor in its size class. It uses a bigger NdFeB magnet and a high copper content in the winding compared to previous versions, and it supplies a rated torque of 70 mNm. It weighs 189 g (about 0.42 lb) with a diameter of 26 mm. It carries copper‐graphite brushes characterized by high stability and a low wear rate. Booth personnel said the motors often find use in UAV applications involving gymbols or pan/tilt movements for optical sensors.
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