Compact direct drive motors offer high torque density
30 April 2010
Introduced as a completely new category for Kollmorgen's range of direct drive torque motors, the Cartidge DDR motor is now available from Heason Technology. The compact design includes a hollow shaft rotor, a stator and high resolution feedback device, all pre-aligned in a bearing-less assembly and enclosed in a durable housing complete with power and feedback connectors. The motor is mounted on a prepared bolt-circle on the customers machine and through a special compression coupling engages with a solid shaft to directly drive the load which is supported by its own bearing system.
In essence, the Cartridge DDR combines the high performance advantages of the frameless direct drive motor system with the convenience of a full frame torque motor at very competitive pricing and with much simplified installation.
The torque density for this motor is around 50% higher than conventional and similar sized direct drive motors, enabling loads to be driven without the need for gearboxes or other mechanical transmission components, greatly improving the performance and power to size potential for demanding servo applications.
Furthermore, by removing compliance-prone shaft couplings and other power transmission components such as pulleys and gearboxes, any potential for backlash is eliminated and the low cog design allows for smooth rotation, excellent stability and positioning precision. The 'mount and run' concept also simplifies both designing-in and commissioning the motor; and with fewer components, machine maintenance and spares inventory can be reduced.
Cartridge DDR is available in five frame sizes with nominal square flange mounting from 138 mm to 350 mm for continuous torque output from 4.5 Nm to 510 Nm and speeds to 2500 rpm. In the larger frame sizes, the through shaft rotor can include a continuous bore which may be useful for providing machine cabling, slip rings or other services.
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