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A direct drive mechanism is one that takes the power coming from a motor without any reductions (such as a gearbox). ==Advantages== * ''Increased efficiency:'' The power is not wasted in friction (from the belt, chain, etc., and especially, gearboxes.) * ''Reduced noise:'' Being a simpler device, a direct-drive mechanism has fewer parts which could vibrate, and the overall noise emission of the system is usually lower. * ''Longer lifetime:'' Having fewer moving parts also means having fewer parts prone to failure. Failures in other systems are usually produced by aging of the component (such as a stretched belt), or stress. * ''High torque at low rpm.'' * ''Faster and precise positioning.'' High torque and low inertia allows faster positioning times on permanent magnet synchronous servo drives. Feedback sensor directly on rotary part allows precise angular position sensing. * ''Drive stiffness.'' Mechanical backlash, hysteresis and elasticity is removed avoiding use of gearbox or ball screw mechanisms. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Direct drive mechanism」の詳細全文を読む スポンサード リンク
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