Magtorq introduces a wide range of GH series precision planetary gear heads for motion and position control mechanisms for industrial automation systems, robotics, machine tools, medical equipments, packaging machines, and host of other applications requiring high performance servo drive systems.

Designed by our R&D team, development of GH series precision planetary gear heads is a result of our experience of over two decades in manufacturing a variety of planetary gear reducers and customized gear transmissions for demanding and critical applications in Material Handling Equipment, Mining, Sugar, Paper, Steel, Power Plants, Wind Mills, Defence, Pharmaceuticals, and other sectors.

Servo drive system demands fast dynamic response, changing speeds, precise position and motion control, a large number of starts / stops, and high torque to weight ratio components. Magtorq precision planetary gear heads are designed to meet these demanding requirements. With 8 Frame sizes to choose from and each frame size having 15 gear ratios, from 4:1 to 125:1,Magtorq GH series meets the requirements of the most of the general-purpose servo applications.

Salient Features

High torque-to-weight ratio: Single-piece design concept for annulus-housing configuration results in at least 200% increase in torque-to-weight ratio of Magtorq GH Series planetary gear heads, and hence lower inertia as compared to the conventional gear heads.

Low Backlash: Backlash-free operation is ideally desirable in automation. While the total elimination of backlash is practically impossible in toothed gear transmissions, it is possible to reduce backlash to a minimum through close control of the dimensions of the gear teeth. Magtorq GH Series planetary gear heads are specified for backlash of better than 10-arc min. for standard models and better than 5-arc min. for precision class models.

High cyclic load carrying capacity: Magtorq GH Series planetary gear heads are designed to deliver the rated acceleration torque up to 900 cycles per hour. For more frequent cycles or for applications having frequent reversals of direction of rotation, de-rating of the gear heads is recommended.

High peak torque capacity: Magtorq GH Series planetary gear heads are designed to withstand the rated peak torque for a maximum of 1000 cycles during their life. For applications that need higher cycles of peak torque, higher frame size should be selected.

High Torsional Stiffness: Faster accelerations and decelerations, changing speeds, a large number of start-stops and reversals, etc., which are typical requirements of most servo systems, give rise to undesirable oscillations in drive and driven mechanisms, affecting the positional accuracies. High torsional stiffness of the drive mechanism reduces such undesirable oscillations.

Long-life Lubrication: Magtorq GH Series planetary gear heads come with factory-filled synthetic lubricant for longer service life, eliminating frequent re-lubrications and avoiding messy oil leakages. Planetary configuration, an inherently balanced system, automatically redistributes the lubricant to all the gear meshes and bearings.

Easy Motor Mounting: Self-supported hollow input shaft and tailor-made input flange enable direct mounting of the specific motor on the gear head, eliminating the need of external coupling.

Square shaped Body and Mounting Flanges: Magtorq GH Series planetary gear heads come with square shaped housing for easy and aesthetic fitment of the square shaped servomotors.
Quiet operation Ground and profile corrected gears reduce their noise level Magtorq to below 72dB under normal running conditions.

High radial load carrying capacity: Use of larger diameter output shaft and its bearings and wider bearing span through straddle mounting of the output member, enhances the radial load carrying capacity of Magtorq GH Series planetary gear heads by over 300% as compared to conventional gear heads.

Selection Procedure

The following points give the general guidelines for the selection of Magtorq GH Series planetary gear heads on the basis of the dimensions and performance characteristics of the servomotors that are being used with them. Please refer to the performance data table and proceed as detailed below.

Motor Dimensions: Check the motor's mounting flange PCD and select a GH Series Gear head of equal or higher PCD. In case of square shaped servo motor, check the square dimensions of the servo motor and select the GH Series Gear head having equal or next higher frame size. For instance, servomotor having square dimensions up to 90mm sq. needs the Magtorq Gear head model GH90, which has 90mm sq. body dimensions.

Reduction Ratio: Select the reduction ratio that is required for the above table. Magtorq GH series gear heads are rated for the maximum input speed of 3000 rpm. For optimum size of the servomotor, it is advisable to select a gear head with a reduction ratio where the maximum speed of the servomotor matches that of the maximum speed required at the driven mechanism.

Input torque: Check the maximum acceleration torque of the servomotor. Multiply this torque rating with the required reduction ratio to get the maximum acceleration torque available at the output of the gear head. This value should be less than the maximum acceleration torque rating, Ta, of the selected gear head.

Ta can be applied for maximum 900 times per hour. Select a higher frame size of the gear head if Ta does not meet the demand accelerating torque requirement. A larger frame size may also be required if the application demands duty cycles of more than 900 per hour.

Peak torque: The peak output torque rating, Tp, indicates the capacity of the gear head to withstand the short time load transients that result from instantaneous stoppage of the servomotor by applying its emergency stop brake, jamming of the driven mechanism, and so on. Tp can be applied for a maximum of 1000 times in the service life of the gear head.