Direct drive holds many advantages such as:
• Efficiency, thanks to doing away with power loss due to friction over belts, chains and gearboxes.
• Reduced noise, thanks to fewer parts allowing for less vibrations
• Reliability, less moving parts mean less possible failures
• High torque even at low rpm
• Better positioning, high torque and low inertia allow for faster and more accurate positioning Feedback sensors ensure precise angular positioning
The main disadvantage of doing away with power transmission is the need for a motor which provides high torque at slow speeds, such motors tend to be physically larger and require precise control mechanisms.
Linear and Rotary Direct Drive Motors
Direct drive technology has greatly developed over the last decade. Today there’s a choice between different types of systems such as “housed rotary”, “cartridge rotary” and frameless.
Linear direct drive systems are also available, the rotary motor is laid out flat and directly coupled to the load to be driven.
Systems such as those listed above are widely used in fans, hard drives, CNC machines (and other industrial machinery in which precise turning tables are used), mounts for accurate positioning in equipment used for photographing, copying and printing as well as in medical systems, textile manufacturing and a wide variety of other appliances, systems and applications.
Direct drive motors are used as advanced servomotors, most new models are brushless motors. Frameless motors allow for simple installation, assembling a motor kit which can be easily embedded in many types of machines.