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Housed direct drive rotary motors are often referred to as housed torque (or torquer) motors because of their ability to produce high torque at low speeds, even when stalled. Torque motors tend to be brushless, permanent magnet synchronous motors — much like a traditional servo motor, but with a higher pole count.
Housed direct drive rotary motors are typically available in a hollow-shaft configuration with integrated feedback devices (resolvers, single and multi-turn sine encoders, etc.) Most units are provided with internal high capacity bearings; however, some housed models are bearingless and require external bearings to support the rotor.
If you are looking for frameless direct drive rotary motors, please visit our framelesspage.
Leveraging over 70 years of product innovation, Kollmorgen pioneered the development of direct drive technology. Today, their Direct Drive Rotary (DDR) and KBM Frameless motor solutions offer industry-leading performance, zero maintenance, clean mechanical assembly, improved accuracy, higher throughput, better reliability, and smooth, quiet operation to suit a wide variety of machine design needs. The concept of Direct Drive technology involves replacing conventional servo motors coupled to some form of mechanical transmission such as gearbox, timing belts, pulleys, or ballscrews. Mechanical transmissions introduce backlash, mechanical losses and noise that can reduce machine performance.
In addition, mechanical transmissions increase machine size and weight. Direct Drive motors, either housed (DDR), partially housed (CDR) or frameless (KBM) directly mount to the load to be driven thereby eliminating such challenges and in many cases provides a much more robust alternative. System maintenance is greatly reduced as mechanical parts prone to wear are removed, dramatically improving overall MTBF rates. Improved load acceleration, lower power consumption, reduced system inertia, and higher precision are major advantages that direct drive solutions can provide.
Our exclusive Cartridge DDR® servomotors combine the performance advantages of a frameless motor with the ease of installation of a full-frame motor. The advanced electromagnetic design provides up to 50 percent more torque density than comparably sized conventional servo motors. Features include:
5 frame sizes, multiple lengths
230 / 400 / 480 VAC windings available (high and low)
4.5 to 510 N-m (3.3 lb-ft to 376 lb-ft) continuous torque accommodates a wide range of high-power application requirements
Speeds up to 2,500 rpm meet most medium speed and high torque application requirements
Power ratings from 775 to 11,700 watts meet high power demands for most applications
Integral sine encoder feedback provides resolution of over 134 million counts per revolution