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New Direct-Drive Motors Reduce Operating Costs





Motor Technology has extended its range of direct-drive servomotors to include Danaher Motionís new Cartridge DDR motor, which, they say, will reduce operating costs by at least £5,000 over five years. The Cartridge DDR is a cleverly redesigned direct-drive rotary servomotor that combines the performance advantages of frameless direct-drive motors with the ease of installation of a full-frame motor.


Direct-drive motors fit directly to the driven load and dispense with the need for power transmission components such as gearboxes, couplings, toothed belts, sprockets and chains. The new Cartridge DDR motor is unique in that it doesnít have bearings. Instead, it uses the machineís bearings to support the motorís rotor. The frame of the Cartridge DDR mounts to a pilot and bolt circle on the machine frame, much like a conventional motor. The rotor engages to the load using an innovative compression coupling, which effectively makes the motor's rotor and the load one piece, eliminating any compliance between the motor and the load.


The Cartridge DDR motor is completely maintenance free and is so simple to install that the manufacturers claim it could be up and running within 30 minutes of taking it out of the box. This compares favourably to the months of engineering and days of installation of a frameless motor and feedback device.


Danaher say that even with a slightly higher initial purchase price the new Cartridge DDR motors have lower running costs than a traditional servo system because of their easy installation, maintenance-free operation and the eradication of any other power transmission components.


CE marked and UL listed for global application the new Cartridge DDR motors are manufactured with pre-engineered components and have an integrated, factory-aligned, high-resolution feedback device. They are available with two frame sizes of either 246 or 350mm. There are three stack lengths in each frame size, continuous torque of 50 to 504Nm, and peak torque from between 120 to 1,016Nm.


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