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.
Read more about this topic: Direct Drive Mechanism
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