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Novel direct-drive motor `will save $10,000`

01 April, 2004

Novel direct-drive motor `will save $10,000`

Danaher Motion has developed a range of direct-drive rotary servomotors which, it claims, represent a new category of direct-drive technology that combines the performance of frameless direct-drive motors with the ease of installation of full-frame motors. The company reckons that, over a five-year period, the maintenance-free Kollmorgen Cartridge DDR motor will cut operating costs by more than $10,000, compared to traditional servo systems with mechanical transmissions.

Unlike the weeks or months it can take to integrate existing frameless direct-drive systems, Danaher says that the new bearing-less motor can be running within 30 minutes of being unpacked.

The motor (above) consists of a rotor, stator, and a factory-aligned high-resolution feedback device. The rotor is supported by the driven machine`s bearings. The rotor engages with the load via a compression coupling which effectively makes the rotor and load one piece. The frame mounts to the machine in a similar way to a conventional servo motor.

By eliminating mechanical transmission components, the new motor is said to be up to 50 times more accurate, and up to 20dB quieter than a conventional servo drive. Its torque density is also claimed to be up to 50% higher.

Although the new motor costs slightly more than a conventional servo system, Danaher says that its running costs will be much lower because of the easier installation, maintenance-free operation and avoidance of mechanical breakdowns such as belt or gear failures.

The Cartridge DDR motors are available in two frame sizes with three stack lengths per frame. They provide 50--510Nm of continuous torque, peak torques of up to 1,100Nm and speeds of up to 1,200 rpm. The motors are available for 230V, 400V and 480V supplies.

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