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Benefits of Direct Drive Technology. ELECTROMATE INDUSTRIAL SALES LTD. Precision Technology & Quality. Operator Interface & Machine Control. Speed Torque Matching. Rotary To Linear Conversion. Connecting the Load. Architecture. Motion Control. Amp. Motor. Feedback. Path Gen. Position.
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Benefits of Direct Drive Technology ELECTROMATEINDUSTRIAL SALES LTD.Precision Technology & Quality
Operator Interface & Machine Control Speed Torque Matching Rotary To Linear Conversion Connecting the Load Architecture Motion Control Amp Motor Feedback Path Gen Position Velocity Torque PLC-Based Gearboxes Bearings Multi-Axis Standalone Screws Motors PC-Based Couplings 1-Axis Standalone Putting the Best Solution Together
Why Direct Drive Technology? • Direct coupling of the load to the motor • No compliance between motor and load • Inertia mismatch is irrelevant (theoretically) • 1000:1 inertia mismatch applications in place (standard servo is 10:1)
Frameless DDR(Parts set) Significant integration, best package fit Easy to integrate, package size fixed Cartridge DDR™ Fully housed DDR Easy to integrate, package size fixed DDR Direct Drive Rotary Formats DDR Product Formats Ease of Use
Frameless - Brushed • Permanent magnet stator (stationary) • Wound armature/rotor (rotating) • Self-commutating • Limited peak power due to mechanical switching that results in excessive sparking in DC motors. • Least torque ripple of any motor design
Frameless - Brushless • Wound stator (stationary) • Permanent magnet armature/rotor (rotating - reduced inertia) • Commutation is done based on rotor position such that synchronism is always maintained. This is referred to as self-synchronism. The motor maintains the ability to deliver torque regardless of the velocity error. • High commutation frequencies = high speeds • Good heat dissipation because the windings are on the outside • The ability to deliver current based on demand is a key feature of servos. If the motor is at rest and there is no load, no current is consumed, and the motor can cool. • High bus voltage to force current into the windings is available; mitigates the electrical time constant of the winding
GOLDLINE DDR Features • Typical application: • Rotary indexing table • To replace any mechanical transmission that is high maintenance or has short life. • Housed motor with bearings and integrated feedback • Resolver or sine encoder feedback • Single or double bearing version • Large thru bore
Zero maintenance No Belts or gears Reliability Reduce down time No transmission parts to break Improved performance Increase accuracy up to 50 times Eliminate resonance and oscillation problems Clean mechanical assembly Lower parts count Reduce assembly time Smooth and quiet Hollow shaft option Run process thru the motor The Benefits of DDR Technology To gain Benefits of Eliminating Mechanical Transmissions
Purchase Price Purchase Price (all components) Mechanical TransmissionDDR Lifetime Cost – DDR vs. Mechanical Lower Throughput Unscheduled Downtime Unscheduled Downtime Belt/gearbox replacements Belt/gearbox maintenance
Cartridge DDR Product Line • Best features of a frameless DDR and a fully housed DDR • Direct drive servo performance & zero maintenance, in an easy to integrate package • It has no bearings…but it has everything else • Feedback is pre-mounted and pre-alignedat the factory • Single part number ready to mount • Eliminates significant engineering design through advanced mechanical design
RINGFEDER Cartridge DDR: Section
CDDR Application Considerations • Machine has existing bearings? • Through-bore required? • Fast, accurate motion is required? • Reliability and zero motor maintenance is a must? • Fast machine maintenance a requirement? • Consider ... • Axial shaft movement • Shaft dimensions and TIR • Perpendicularity of mounting surface • Thermal capacity of machine structure
Cartridge DDR Applications • Any application where the machine has its own set of bearings, but still can benefit from the DDR performance advantages • Converting: • Rollers, Coaters, Feeders, Die Cutters • Other application examples • Injection molding: IM machine mold indexing • Press feed: Incremental motion
Customer Load Wheel 4 Feet Diameter 250 Pounds 96 Steel pegs 3.75 degrees per peg Total Inertia 15 lb-ft-s2 GOLDLine DDR Indexer DH143M Goldline DDR 250 Lb-ftContinuous 989 Lb-ft Peak S620 Drive Amplifier 240 or 480 Vac 20 A Continuous, 40 Peak
Single Peg Index Velocity Profile 3.75 Degree Move) Total Move Time 97 ms Settling Time 13 ms Velocity Profile
Indexing a Single Peg • If the Video does not play: • Right click inside Windows Media Player screen above and choose Properties • Choose “SinglePeg WindowsMediaPlayer” from pull down and “Alphabetic” tab • Click on button at the end of “(Custom)” row and “Browse” to file on CD-ROM • File name is “DDR One Peg Index.wmv”, click Slide Show icon to view
One Revolution Index • If the Video does not play: • Right click inside Windows Media Player screen and choose Properties • Choose “FullRevolution WindowsMediaPlayer” from pull down and “Alphabetic” tab • Click on button at the end of “(Custom)” row and Browse to file location on CD-ROM • File name is “DDR One Revolution Index.wmv”, click Slide Show icon to view
Repeatability Test Bar Clamped to Table 26 inch radius from center Indicator 1 Thousandth Inch / Number 1 Ten Thousandth Inch / division 0.8 Arc Seconds / division
Repeatability Test Video • If the Video does not play: • Right click inside Windows Media Player screen above and choose Properties • Choose “Repeatability WindowsMediaPlayer” from pull down and “Alphabetic” tab • Click on button at the end of “(Custom)” row and “Browse” to file on CD-ROM • File name is “DDR Repeatability Test.wmv”, click Slide Show icon to view
DDR vs. Mechanical Indexer Customer identified these advantages of the DDR over the mechanical indexer they used previously • Improved Repeatability • DDR Accuracy and Repeatability do not degrade over time as with the mechanical indexer • Can immediately stop DDR motion if there is a process error • Greatly reduced audible noise • Easily change DDR index angle, speed, and dwell • DDR provides better overall value
Linear motor - rotary motor rolled out flat! N S Linear vs. Standard Rotary Motors stator windings moving coil air gap magnets magnetic way Rotating rotor
Comparative Technologies Mechanical Transmission Advantages Disadvantages Timing Belt Speed Compliance, Accuracy Wear, Contamination Maintenance Rack and Pinion Speed Backlash, Wear Long Travel Audible Contamination Ball Screw High Force Limited Speed Settling Time Wear, Maintenance
High Speeds - 200 in/sec (10 m/sec) High Acceleration - 3-5 g's are typical Fast Move and Settle High Resolution Long travel distances - 20 feet or more possible Smoothness (zero cogging) No maintenance (non-contact) Zero backlash High dynamic stiffness, no compliance Indicators for a Linear Motor Solution
Ironless zero cogging zero attractive force ultra-high acceleration very smooth motion Up to 1600 N peak force Iron Core high peak force patented anti-cogging design high force density Up to 15000 N peak force Comparison of DDL Motors