Precision precision planetary gearbox planetary Gearheads
The primary reason to employ a gearhead is that it makes it possible to regulate a huge load inertia with a comparatively small motor inertia. Without the gearhead, acceleration or velocity control of the strain would require that the electric motor torque, and so current, would have to be as many times better as the lowering ratio which can be used. Moog offers a selection of windings in each framework size that, combined with an array of reduction ratios, provides an range of solution to outcome requirements. Each combination of motor and gearhead offers unique advantages.
Precision Planetary Gearheads
gearheads
32 mm LOW PRICED Planetary Gearhead
32 mm Accuracy Planetary Gearhead
52 mm Accuracy Planetary Gearhead
62 mm Accuracy Planetary Gearhead
81 mm Accuracy Planetary Gearhead
120 mm Precision Planetary Gearhead
Precision planetary gearhead.
Series P high precision inline planetary servo travel will gratify your most demanding automation applications. The compact design, universal housing with precision bearings and accuracy planetary gearing provides excessive torque density and will be offering high positioning efficiency. Series P offers actual ratios from 3:1 through 40:1 with the highest efficiency and lowest 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.)
Equipment Ratios: Up to 100:1 in two stages
Input Options: Matches any servo motor
Output Options: End result 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 in high speeds combined with the associated load sharing generate planetary-type gearheads ideal for servo applications
Accurate helical technology provides elevated tooth to tooth contact ratio by 33% vs. spur gearing 12¡ helix angle produces simple and quiet operation
One piece planet carrier and outcome shaft design reduces backlash
Single step machining process
Assures 100% concentricity Heightens torsional rigidity
Efficient lubrication forever
The excessive precision PS-series inline helical planetary gearheads can be found in 60-220mm frame sizes and provide high torque, great radial loads, low backlash, large input speeds and a tiny package size. Custom versions are possible
Print Product Overview
Ever-Power PS-series gearheads provide the highest performance to meet your applications torque, inertia, speed and reliability requirements. Helical gears give smooth and quiet operation and create higher power density while keeping a tiny envelope size. Available in multiple body sizes and ratios to meet 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 more torque ability, lower backlash, and calm operation
• Ring gear slice into housing provides increased torsional stiffness
• Widely spaced angular speak to bearings provide productivity shaft with huge radial and axial load capability
• Plasma nitride heat therapy for gears for good surface have on and shear strength
• Sealed to IP65 to safeguard against harsh environments
• Mounting kits for direct and convenient assembly to hundreds of different motors
Applications
• Packaging
• Processing
• Bottling
• Milling
• Antenna pedestals
• Conveyors
• Robotic actuation and propulsion
PERFORMANCE CHARACTERISTICS
PERFORMANCEHigh Precision
CONFIGURATIONInline
GEAR GEOMETRYHelical Planetary
Body SIZE60mm | 90mm | 115mm | 142mm | 180mm | 220mm
STANDARD BACKLASH (ARC-MIN)< 4 to < 8
LOW BACKLASH (ARC-MIN)< 3 to < 6
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 Quickness (RPM)6000
AMOUNT OF PROTECTION (IP)IP65
EFFICIENCY By NOMINAL TORQUE (%)94 – 97
CUSTOM VERSIONS AVAILABLEYes
The Planetary (Epicyclical) Gear System as the “System 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 certainly the main characteristic requirement for a servo gearboxes; backlash is normally a way of measuring the precision of the planetary gearbox.
The fact is, fixed-axis, standard, “spur” gear arrangement systems could be designed and made merely as easily for low backlash requirements. Furthermore, low backlash is not an absolute requirement of servo-structured automation applications. A moderately low backlash is a good idea (in applications with high start/stop, forwards/reverse cycles) in order to avoid inner shock loads in the apparatus mesh. That said, with today’s high-image resolution motor-feedback units and associated action controllers it is easy to compensate for backlash anytime there is a transform in the rotation or torque-load direction.
If, for as soon as, we discount backlash, after that what are the factors for selecting a more expensive, seemingly more technical planetary devices for servo gearheads? What advantages do planetary gears present?
High Torque Density: Compact Design
An important requirement of automation applications is great torque capacity in a compact and light bundle. This huge torque density requirement (a high torque/quantity or torque/pounds ratio) is important for automation applications with changing high dynamic loads in order to avoid additional system inertia.
Depending upon the number of planets, planetary systems distribute the transferred torque through multiple gear mesh points. This implies a planetary equipment with declare three planets can transfer 3 x the torque of an identical sized fixed axis “normal” spur gear system
Rotational Stiffness/Elasticity
High rotational (torsional) stiffness, or minimized elastic windup, is important for applications with elevated positioning accuracy and repeatability requirements; especially under fluctuating loading conditions. The strain distribution unto multiple equipment mesh points ensures that the load is backed by N contacts (where N = number of planet gears) hence increasing the torsional stiffness of the gearbox by factor N. This means it substantially lowers the lost movement compared to an identical size standard gearbox; and this is what is desired.
Low Inertia
Added inertia results within an extra torque/energy requirement of both acceleration and deceleration. Small gears in planetary system cause lower inertia. Compared to a same torque score standard gearbox, this is a reasonable approximation to say that the planetary gearbox inertia is usually smaller by the square of the number of planets. Again, this advantage is normally rooted in the distribution or “branching” of the load into multiple equipment mesh locations.
High Speeds
Contemporary servomotors run at excessive rpm’s, hence a servo gearbox should be able to operate in a reliable manner at high type speeds. For servomotors, 3,000 rpm is pretty much the standard, and actually speeds are constantly increasing in order to optimize, increasingly intricate application requirements. Servomotors working at speeds in excess of 10,000 rpm aren’t unusual. From a score viewpoint, with increased swiftness the power density of the engine increases proportionally with no real size boost of the engine or electronic drive. Thus, the amp rating stays about the same while simply the voltage must be increased. An important factor is in regards to the lubrication at substantial operating speeds. Set axis spur gears will exhibit lubrication “starvation” and quickly fail if operating at high speeds for the reason that lubricant is slung away. Only special means such as pricey pressurized forced lubrication systems can solve this problem. Grease lubrication is certainly impractical due to its “tunneling effect,” in which the grease, as time passes, is pushed aside and cannot circulation back to the mesh.
In planetary systems the lubricant cannot escape. It is continuously redistributed, “pushed and pulled” or “mixed” in to the equipment contacts, ensuring secure lubrication practically in virtually any mounting job and at any acceleration. Furthermore, planetary gearboxes could be grease lubricated. This feature is certainly inherent in planetary gearing because of the relative movement between the various gears creating the arrangement.
The Best ‘Balanced’ Planetary Ratio from a Torque Density Viewpoint
For much easier computation, it is recommended that the planetary gearbox ratio can be an actual integer (3, 4, 6…). Since we are so used to the decimal system, we have a tendency to use 10:1 despite the fact that it has no practical advantage for the computer/servo/motion controller. In fact, as we will have, 10:1 or more ratios will be the weakest, using minimal “balanced” size gears, and hence have the lowest torque rating.
This article addresses simple planetary gear arrangements, meaning all gears are participating in the same plane. Almost all the epicyclical gears found in servo applications will be of the simple planetary design. Physique 2a illustrates a cross-section of this kind of a planetary gear set up using its central sun gear, multiple planets (3), and the ring gear. The definition of the ratio of a planetary gearbox proven in the number is obtained straight from the unique kinematics of the machine. It is obvious that a 2:1 ratio is not possible in a simple planetary gear program, since to satisfy the previous equation for a ratio of 2:1, sunlight gear would have to have the same size as the ring equipment. Figure 2b shows sunlight gear size for several ratios. With increased ratio the sun gear size (size) is decreasing.
Since gear size affects loadability, the ratio is a strong and direct affect to the torque rating. Figure 3a reveals the gears in a 3:1, 4:1, and 10:1 simple system. At 3:1 ratio, sunlight gear is significant and the planets will be small. The planets have become “slim walled”, limiting the area for the earth bearings and carrier pins, hence limiting the loadability. The 4:1 ratio is normally a well-balanced ratio, with sun and planets having the same size. 5:1 and 6:1 ratios still yield pretty good balanced equipment sizes between planets and sunshine. With higher ratios approaching 10:1, the small sun gear becomes a solid limiting aspect for the transferable torque. Simple planetary patterns with 10:1 ratios have very small sunshine gears, which sharply limits torque rating.
How Positioning Precision and Repeatability is Suffering from the Precision and Quality Category of the Servo Gearhead
As previously mentioned, this is a general misconception that the backlash of a gearbox is a way of measuring the product quality or precision. The truth is that the backlash features practically nothing to perform with the product quality or precision of a gear. Simply the consistency of the backlash can be viewed as, up to certain level, a form of way of measuring gear top quality. From the application point of view the relevant concern is, “What gear houses are influencing the precision of the motion?”
Positioning reliability is a way of measuring how exact a desired job is reached. In a shut loop system the prime determining/influencing factors of the positioning reliability will be the accuracy and image resolution of the feedback system and where the job is definitely measured. If the positioning is normally measured at the ultimate productivity of the actuator, the effect of the mechanical elements can be practically eliminated. (Immediate position measurement is employed mainly in high precision applications such as machine equipment). In applications with less positioning accuracy necessity, the feedback transmission is produced by a responses devise (resolver, encoder) in the electric motor. In this case auxiliary mechanical components attached to the motor like a gearbox, couplings, pulleys, belts, etc. will effect the positioning accuracy.
We manufacture and style high-quality gears and complete speed-reduction systems. For build-to-print customized parts, assemblies, style, engineering and manufacturing providers speak to our engineering group.
Speed reducers and equipment trains can be classified according to gear type and also relative position of input and output shafts. SDP/SI offers a wide variety of standard catalog items:
gearheads and speed reducers
planetary and spur gearheads
proper angle and dual productivity right angle planetary gearheads
We realize you might not exactly be interested in choosing the ready-to-use swiftness reducer. For anybody who wish to design your personal special gear train or speed reducer we give you a broad range of accuracy gears, types, sizes and materials, available from stock.
