Precision precision planetary gearbox planetary Gearheads
The primary reason to employ a gearhead is that it creates it possible to control a sizable load inertia with a comparatively small motor inertia. Without the gearhead, acceleration or velocity control of the strain would require that the engine torque, and so current, would need to be as much times better as the decrease ratio which is used. Moog offers an array of windings in each frame size that, combined with an array of reduction ratios, offers an range of solution to result requirements. Each mixture of electric motor and gearhead offers exceptional advantages.
Precision Planetary Gearheads
gearheads
32 mm LOW PRICED Planetary Gearhead
32 mm Precision Planetary Gearhead
52 mm Accuracy Planetary Gearhead
62 mm Accuracy Planetary Gearhead
81 mm Precision Planetary Gearhead
120 mm Accuracy Planetary Gearhead
Precision planetary gearhead.
Series P high precision inline planetary servo drive will satisfy your most demanding automation applications. The compact design, universal housing with precision bearings and accuracy planetary gearing provides high torque density while offering high positioning overall performance. Series P offers specific ratios from 3:1 through 40:1 with the highest efficiency and cheapest backlash in the industry.
Key Features
Sizes: 60, 90, 115, 140, 180 and 220
Outcome Torque: Up to 1 1,500 Nm (13,275 lb.in.)
Gear Ratios: Up to 100:1 in two stages
Input Options: Suits any servo motor
Output Options: Output with or without keyway
Product Features
As a result of load sharing features of multiple tooth contacts,planetary gearboxes supply the highest torque and stiffness for just about any given envelope
Balanced planetary kinematics by high speeds combined with associated load sharing produce planetary-type gearheads well suited for servo applications
True helical technology provides improved tooth to tooth contact ratio by 33% vs. spur gearing 12¡ helix angle produces simple and quiet operation
One piece world carrier and productivity shaft design reduces backlash
Single step machining process
Assures 100% concentricity Enhances torsional rigidity
Efficient lubrication for life
The excessive precision PS-series inline helical planetary gearheads can be found in 60-220mm frame sizes and offer high torque, great radial loads, low backlash, great input speeds and a small package size. Custom editions are possible
Print Product Overview
Ever-Power PS-series gearheads supply the highest performance to meet your applications torque, inertia, speed and reliability requirements. Helical gears present smooth and quiet procedure and create higher electric power density while retaining a little envelope size. Available in multiple body sizes and ratios to meet up a range of application requirements.
Markets
• Industrial automation
• Semiconductor and electronics
• Food and beverage
• Health and beauty
• Life science
• Robotics
• Military
Features and Benefits
• Helical gears provide even more torque capacity, lower backlash, and silent operation
• Ring gear lower into housing provides increased torsional stiffness
• Widely 
spaced angular speak to bearings provide output shaft with high radial and axial load capability
• Plasma nitride heat therapy for gears for wonderful surface use and shear strength
• Sealed to IP65 to protect against harsh environments
• Mounting kits for direct and easy assembly to a huge selection of different motors
Applications
• Packaging
• Processing
• Bottling
• Milling
• Antenna pedestals
• Conveyors
• Robotic actuation and propulsion
PERFORMANCE CHARACTERISTICS
PERFORMANCEHigh Precision
CONFIGURATIONInline
GEAR GEOMETRYHelical Planetary
FRAME SIZE60mm | 90mm | 115mm | 142mm | 180mm | 220mm
STANDARD BACKLASH (ARC-MIN)LOW BACKLASH (ARC-MIN)NOMINAL TORQUE (NM)27 –
1808
NOMINAL TORQUE (IN-LBS)240 – 16091
RADIAL LOAD (N)1650 – 38000
RADIAL LOAD (LBS)370 – 8636
RATIO3, 4, 5, 7, 10, 15, 20, 25, 30, 40, 50, 70, 100:1
MAXIMUM INPUT Rate (RPM)6000
DEGREE OF PROTECTION (IP)IP65
EFFICIENCY In NOMINAL TORQUE (%)94 – 97
CUSTOM VERSIONS AVAILABLEYes
The Planetary (Epicyclical) Gear System as the “Program of preference” for Servo Gearheads
Regular misconceptions regarding planetary gears systems involve backlash: Planetary systems are used for servo gearheads as a result of their inherent low backlash; low backlash is definitely the main characteristic requirement for a servo gearboxes; backlash can be a measure of the precision of the planetary gearbox.
The fact is, fixed-axis, standard, “spur” gear arrangement systems can be designed and built simply as easily for low backlash requirements. Furthermore, low backlash isn't an absolute requirement of servo-based mostly automation applications. A moderately low backlash is a good idea (in applications with high start/stop, frontward/reverse cycles) to avoid internal shock loads in the gear mesh. That said, with today's high-quality motor-feedback units and associated action controllers it is easy to compensate for backlash anytime there is a change in the rotation or torque-load direction.
If, for the moment, we discount backlash, then what are the reasons for selecting a more expensive, seemingly more complex planetary devices for servo gearheads? What advantages do planetary gears give?
High Torque Density: Small Design
An important requirement for automation applications is substantial torque capacity in a compact and light bundle. This large torque density requirement (a higher torque/quantity or torque/excess weight ratio) is important for automation applications with changing large dynamic loads in order to avoid additional system inertia.
Depending upon the amount of planets, planetary systems distribute the transferred torque through multiple equipment mesh points. This means a planetary gear with claim three planets can transfer 3 x the torque of an identical sized fixed axis “standard” spur gear system
Rotational Stiffness/Elasticity
Substantial rotational (torsional) stiffness, or minimized elastic windup, is important for applications with elevated positioning accuracy and repeatability requirements; specifically under fluctuating loading circumstances. The load distribution unto multiple gear mesh points ensures that the load is backed by N contacts (where N = number of planet gears) therefore raising the torsional stiffness of the gearbox by point N. This implies it substantially lowers the lost motion compared to a similar size standard gearbox; and this is what is desired.
Low Inertia
Added inertia results in an additional torque/energy requirement for both acceleration and deceleration. Small gears in planetary system result in lower inertia. Compared to a same torque rating standard gearbox, it is a fair approximation to state that the planetary gearbox inertia is smaller by the sq . of the amount of planets. Again, this advantage is rooted in the distribution or “branching” of the strain into multiple gear mesh locations.
High Speeds
Modern servomotors run at substantial rpm's, hence a servo gearbox should be able to operate in a reliable manner at high input speeds. For servomotors, 3,000 rpm is practically the standard, and actually speeds are regularly increasing so that you can optimize, increasingly intricate application requirements. Servomotors jogging at speeds more than 10,000 rpm aren't unusual. From a rating perspective, with increased velocity the power density of the motor increases proportionally with no real size boost of the electric motor or electronic drive. Hence, the amp rating remains a comparable while simply the voltage must be increased. A key point is in regards to the lubrication at great operating speeds. Set axis spur gears will exhibit lubrication “starvation” and quickly fail if running at high speeds since the lubricant is slung away. Only exceptional means such as high-priced pressurized forced lubrication devices can solve this issue. Grease lubrication is impractical because of its “tunneling effect,” in which the grease, as time passes, is pushed aside and cannot movement back to the mesh.
In planetary systems the lubricant cannot escape. It really is constantly redistributed, “pushed and pulled” or “mixed” into the gear contacts, ensuring secure lubrication practically in any mounting position and at any rate. Furthermore, planetary gearboxes could be grease lubricated. This characteristic is definitely inherent in planetary gearing as a result of the relative movement between the different gears creating the arrangement.
THE VERY BEST ‘Balanced' Planetary Ratio from a Torque Density Perspective
For a lot easier computation, it is desired that the planetary gearbox ratio is an actual integer (3, 4, 6…). Since we are very much accustomed to the decimal program, we have a tendency to use 10:1 even though this has no practical benefits for the computer/servo/motion controller. In fact, as we will have, 10:1 or higher ratios will be the weakest, using the least “well balanced” size gears, and therefore have the cheapest torque rating.
This article addresses simple planetary gear arrangements, meaning all gears are participating in the same plane. The vast majority of the epicyclical gears found in servo applications happen to be of this simple planetary design. Number 2a illustrates a cross-section of such a planetary gear arrangement with its central sun gear, multiple planets (3), and the ring gear. The definition of the ratio of a planetary gearbox proven in the figure is obtained directly from the unique kinematics of the machine. It is obvious that a 2:1 ratio isn't possible in a simple planetary gear program, since to satisfy the previous equation for a ratio of 2:1, the sun gear would need to have the same size as the ring equipment. Figure 2b shows sunlight gear size for numerous ratios. With an increase of ratio sunlight gear size (size) is decreasing.
Since gear size impacts loadability, the ratio is a strong and direct impact to the torque ranking. Figure 3a reveals the gears in a 3:1, 4:1, and 10:1 straightforward system. At 3:1 ratio, sunlight gear is significant and the planets are small. The planets have become “slim walled”, limiting the space for the earth bearings and carrier pins, consequently limiting the loadability. The 4:1 ratio is usually a well-well-balanced ratio, with sunshine and planets having the same size. 5:1 and 6:1 ratios still yield pretty good balanced equipment sizes between planets and sunshine. With bigger ratios approaching 10:1, the small sun equipment becomes a strong limiting aspect for the transferable torque. Simple planetary patterns with 10:1 ratios have really small sunshine gears, which sharply limitations torque rating.
How Positioning Reliability and Repeatability is Affected by the Precision and Top quality Category of the Servo Gearhead
As previously mentioned, this is a general misconception that the backlash of a gearbox is a measure of the quality or precision. The truth is that the backlash possesses practically nothing to perform with the quality or precision of a gear. Just the regularity of the backlash can be considered, up to certain degree, a form of measure of gear quality. From the application viewpoint the relevant concern is, “What gear houses are influencing the precision of the motion?”
Positioning reliability is a measure of how precise a desired situation is reached. In a closed loop system the prime determining/influencing factors of the positioning accuracy are the accuracy and resolution of the feedback product and where the job is normally measured. If the positioning is certainly measured at the ultimate output of the actuator, the influence of the mechanical components can be practically eliminated. (Immediate position measurement is employed mainly in high precision applications such as machine tools). In applications with a lesser positioning accuracy requirement, the feedback signal is produced by a feedback devise (resolver, encoder) in the electric motor. In this case auxiliary mechanical components mounted on the motor for instance a gearbox, couplings, pulleys, belts, etc. will impact the positioning accuracy.
We manufacture and design high-quality gears and complete speed-reduction systems. For build-to-print customized parts, assemblies, design, engineering and manufacturing companies speak to our engineering group.
Speed reducers and gear trains can be classified according to gear type as well as relative position of suggestions and output shafts. SDP/SI offers a multitude of standard catalog items:
gearheads and speed reducers
planetary and spur gearheads
right angle and dual end result right angle planetary gearheads
We realize you may well not be interested in choosing the ready-to-use swiftness reducer. For those of you who wish to design your very own special gear educate or swiftness reducer we offer a broad range of precision gears, types, sizes and materials, available from stock.
