Drives Planetary Gear and Motor in One

Related Vendors

SEW-EURODRIVE GmbH & Co KG

FAULHABER Drive Systems

Taiwan Machine Tool & Accessory Builders' Association (TMBA)

Wuxi InfiMotion Technology Co., Ltd.

With PxG integrated, SEW-Eurodrive combines its precision planetary gear PxG with a servo motor into a compact unit.

The very short, compact, and low-inertia precision planetary gear motor PxG integrated is designed for highly dynamic applications with limited space. Wherever only planetary bevel gears could be used before, PxG integrated offers advantages and new possibilities.

In the PxG integrated series, planetary gearboxes from the PxG series and CM3G servomotors merge into a single unit. Compared to conventional planetary servo geared motors, the compact drive is up to 40 percent shorter with a comparable peak torque. This extremely short overall length reduces the mass inertia and therefore enables very high dynamics. The compact design also saves space. The precision planetary geared motors from the PxG integrated series can increase productivity in short-cycle applications by up to 34 percent.

The PxG integrated executes movements precisely and dynamically in the tightest of spaces, making it ideal for use in packaging machines, food production, metal processing and handling. In wire and tube bending machines, for example, the new compact geared motors improve bending accuracy and contribute to an increase in throughput. Space is particularly tight in a chain magazine or a tool changer. This is where the advantage of the short overall length comes into play. High overload capacity and power density are important properties here, for example to achieve synchronized and precise positioning.

Delta Robot Example Application

High-speed handling, precise portioning, sorting and positioning as well as limited space are the typical characteristics of a delta robot, in which each of the three robot arms is driven individually. This is where the high dynamics and precision of the PxG integrated series really come into their own: well over 200 picks per minute can be achieved. In applications with two collaborating delta robots, the installation conditions for the drives are significantly reduced once again. This is because the robot arms are not typically arranged in a star shape, but in a T-shape, and the working areas overlap accordingly.

"The fact that this gearbox-motor unit does not require an adapter shaft or clamping ring, i.e. the sun gear of the planetary gearbox is located directly in the motor shaft, significantly reduces the overall length compared to conventional planetary geared motors," explains Dr. Petr Osipov, System Engineer at SEW-Eurodrive. "On the one hand, this facilitates installation in confined spaces. On the other hand, the extremely short overall length of the drive ensures a low mass moment of inertia and thus makes high dynamics possible."

Versatile Combinatorics

"The fact that the complete PxG modular gearbox system is available almost without restriction and thus enables a wide range of combinations also ensures a high degree of flexibility for the customer," emphasizes Petr Osipov. "For example, output designs such as flanged block or solid shafts are also available in stainless steel as an option. All lubricants included in the PxG modular system can also be used."

The use of the latest winding and magnet technologies in the synchronous servo motor contained in the PxG integrated should also be emphasized. In conjunction with the materials used, a high level of efficiency is achieved with reduced heat generation - despite the compact design. The components have also been optimized in terms of acoustics. Together with the high-precision helical planetary gears of the PxG series, this ensures low-noise operation.

Flexible Motor - Prepared for Modern Requirements

PxG integrated also offers numerous options for different application requirements on the motor side. There is a wide range of encoder systems to choose from, which enable precise position feedback and flexible system integration. For additional safety requirements, the geared motor can optionally be equipped with a holding brake.

The series is also future-proof: further sizes are already in preparation, as is the integration of 48-volt technology - ideal for applications with limited energy requirements or specific network conditions. Single-cable technology is also provided for simplified wiring and space-saving installation. This means that PxG integrated offers maximum flexibility not only mechanically but also electrically.