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  • Brushless DC Motors
    finishes. Because they have no commutator, brushless motors are more efficient, need less maintenance, and can operate at higher speeds than conventional dc motors. High efficiency and small size are especially important for military, aircraft, and
  • PM DC Motors
    conventional unit. The typical range of torque for both brush-type and brushless dc motors is from 7.0 oz-in. to 4,500 lb-ft. Rare-earth magnets have little rotor inertia because they are light and have small radial dimensions. Flux density is also high. The torque-to-inertia ratio for rare-earth
  • Comparing Miniature DC Motors and Gearboxes
    and sub-fractional horsepower dc and stepper motors.
  • Snake-oil specs spell trouble for motor sizing
    , and simulates foldback circuits to ensure that the motor and amplifier combination considers the amplifier's time constant. When sizing and selecting small dc motors, various approaches can be used to determine electrical ratings and motor constants. Picking the wrong approach or using the wrong
  • Mini footballers run on dc micromotors
    of action. Robot football is divided into several categories: small, midsized, four-legged, and humanoid. A German team built and managed by the computing faculty from FU Berlin placed first in the small-size category. Their strong performance depended on batteries and small robust dc
  • Small motors position big glass
    Optical assemblies are precisely positioned using a miniature dc motor, encoder, and a low-backlash planetary gearhead. The most powerful stand-alone telescope in the world goes into operation this year on Mt. Graham near Safford, Ariz. Astronomers are particularly interested in setting
  • Sizing up BLDC motors
    AXH-Series brushless dc (BLDC) motors from Oriental Motor are only 1.65-in. thick, about half the size of comparable ac speed-control motors, and provide up to 50 W of power. AXH-Series BLDC motors maintain constant torque at speeds ranging from 100 to 2,500 rpm. Proper motor sizing is important
  • China ups the motor ante
    China's motor manufacturers are well versed in small, standard motors. Now they're setting their sights on steppers and servos. Chinese manufacturers have been making motors for years. The majority of these have been small ac and dc units for electric tools, toys, and other high-volume applications

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