Frameless ddr motor
The frameless direct drive rotary motors are the "grandfathers" of ddr technology, and they undoubtedly offer the most compact mechanical servo solutions available today. The frameless direct drive rotary motor uses a separate rotor and stator without the use of bearings. These parts become an integral part of the machine and include the necessary feedback devices. They are ideal for applications where machine space is limited or the total weight has a critical impact.
These motors are inherently custom made and therefore more expensive, requiring weeks and even months of design and integration time. In addition, the removal of the motor or feedback device is extremely complicated in the event of a system failure. Therefore, frameless ddr technology is not suitable for every application, its most widely used in airborne and ground vehicles, such as night vision devices, radar systems and weapon system aiming control, and those for size, weight and / Or high-end industrial applications with high performance requirements, such as robots or precision grinders.
Closed ddr motor
The (closed) direct drive rotary motor with housing is a complete solution for integrating the rotor, stator and feedback device that is aligned at the factory into a housing with precision bearings. Closed direct drive rotary motors are ideal for applications where the load can ride across the motor bearings. For motors that already use bearings, the user needs to connect the motor to the load or have three or more bearings aligned, which can be a cumbersome and time consuming task. Therefore, closed ddr motors are commonly used for indexing and rate turret applications.
Modular direct drive rotary motor
The cartridge ddr motor is a new direct drive solution that consists of a unique bearingless housing and integrated rotor, stator and high resolution feedback device that is aligned at the factory. The application of the cylindrical ddr technology eliminates mechanical transmission components, retaining all the advantages of direct drive and avoiding the complex and expensive drawbacks of conventional closed or frameless ddr solutions. The modular direct drive rotary motor utilizes a novel compression coupling to connect the rotor to the shaft and comes with a unique collet design that enables “out of the box” and takes less than 30 minutes .
The advantages of modular technology, along with its significant reduction in competitive price and total life cost, will accelerate the application of direct drive technology in new machine designs in many areas, such as smelting, packaging, printing, semiconductor and factory automation. . See an example below: A package oem that is trying to make its machine output exceed 150 pieces per minute. The challenge is that the flexibility of the gearbox on a critical axis was introduced when they tried to increase production. Mechanical interference. By installing a modular direct drive rotary motor in this axial direction, the mechanical flexibility is eliminated, enabling the oem to increase the output of its machine to 180 pieces per minute. In addition to increasing production, the oem also realized the following benefits: zero maintenance workload, improved reliability and reduced auditory noise.
Another example of a modular direct drive application: an oem provides test/measurement equipment for tire and automotive industry services, the company found that using direct drive technology improves measurement quality and machine reliability by eliminating invalid travel And other external influences brought by the belt and pulley system. Their original design used a frameless direct drive motor, which brought many benefits compared to conventional solutions, but also had the disadvantage of being difficult to assemble and install – in fact, the combination and feedback of frameless motors The alignment of the device takes a whole day. As a result, the company turned to modular direct drive technology and found that due to its simple installation, the integration took only about 30 minutes, saving time and money. In addition, they are happy to see that the modular motor has a higher torque density than the frameless direct drive model.
Thanks to its unique design, modular ddr motors are more competitive in price than traditional servo motors with mechanical drives. Even if its initial cost is slightly higher, the operating cost of this new technology is much lower than that of the traditional system in terms of the total five-year lifespan.
