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MANUFACTURE AN AND D DEVELOPMENT OF A A R RC SERVO MOTOR: CHA HALLEN ENGES F FROM T THE HE PERSPECTIVE OF OF A STAR ART UP UP
By
- B. B. Swaroop
12-Feb-2016
At
TEQIP Pravarthana IIT Kanpur
MANUFACTURE AN AND D DEVELOPMENT OF A A R RC SERVO MOTOR: CHA - - PowerPoint PPT Presentation
MANUFACTURE AN AND D DEVELOPMENT OF A A R RC SERVO MOTOR: CHA - - PowerPoint PPT Presentation
MANUFACTURE AN AND D DEVELOPMENT OF A A R RC SERVO MOTOR: CHA HALLEN ENGES F FROM T THE HE PERSPECTIVE OF OF A STAR ART UP UP At By TEQIP Pravarthana B. B. Swaroop IIT Kanpur 12-Feb-2016 Application How a servo works Principle
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SLIDE 3
How a servo works
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Principle of Working
Basic working of a servo motor
- Ref. www.digitalnemesis.com
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Market
- 108 known companies producing servos worldwide – servodatabase.com
- Classification – Analog / Digital, Different operating voltages, plastic /
metal body and gears, fast / slow, etc
- Price range of $1 to $350
- NONE INDIAN
- Why not make in India ??
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Funds
- PRISM – Promoting Innovations in Individuals, Start ups and
MSMEs – BY DSIR
- With the help of SIDBI, we applied, made presentations,
convinced committees and the only group from our Institute to be granted funds under this category
Project Manager
- Mr. Vishnu Prasad
Lead Designer
- Mr. Divyajyoti Guchait
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Management
Project
Electronics Mechanical Assembly
Design (Mechanical & Electronics) Electronics manufacture Mechanical Component manufacture Assembly Testing
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Drawings
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Targets
Mechanical
- Size : 40 x 20 x 45 mm
- Torque : 12.5 Kg-cm at 8.4V
- Box material : Aluminium
- Gear material : Stainless steel & Brass
- Total weight after assembly: 70gm
Electronics
- PCB Size : 38 x 17.5 x 1.6 mm
- PCB – multi-layered – glass fiber
- Chip level components to be procured
(all components come from china)
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3D - Print
- Primary aim - to check dimensional
compliances between different parts – Target achieved
- Shrinkage
- Brittle
- Tolerances between different moving
parts
- Decided on metal covers and gears
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Setback
- Govt. change
- Policy freeze
- Funds freeze
- Lack of clarity
- Changing timelines
- We start looking for private investors !!
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Metal Gears – Not to scale
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Metal manufacturing
Gear Hob Cutter
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Smallest Gear we need
- Size is very small
- Low module, m=0.25
- Small hole size
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What we saw !!
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- Low volume production for prototypes unsuitable for
business
- Semi-skilled employees not acquainted with such small
dimensions
- Lack of seriousness due to small size
- Unavailability of the miniature gear hob cutter –
Solution – IMPORT….. Probably from China !!
Manufacturing Challenges
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Manufacturing Challenges
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Current Status
3D-printed plastic prototype PCB part procurement PCB CAD design Metal gear CAD design Metal box CAD design IN PROGRESS
- PCB manufacture
- Box manufacture
- Gear manufacture
TO BE DONE × Assembly × Testing × Iterations
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Thank you
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Servos
- Futaba S3151
- Lateral
- Longitudinal
- Collective
- Throttle
- Futaba S9256
- Tail
- GY611 gyro
- AVCS Controller
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Name of Servo
S 3151 S 9256
Weight 42g 57g Operating Speed at 4.8 V with no load 0.21 sec/60 degrees 0.06 sec/60 degrees Torque @ 4.8V 43.00 oz/in (3.1kg.cm) 47.00 oz/in (3.4kg.cm) Dimensions 40.6 x 20 x 36mm 40 x 20 x 36.6mm
Servo actuators under study
S9256 S3151
Servo Actuators - Specifications
Source: http://www.futaba-rc.com/
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Servo Characterization
- Static Calibration
- Time Response
- Frequency Response
Basic working of a servo motor
- Ref. www.digitalnemesis.com
SLIDE 23
Servo Calibration - Test Setup
Potentiometer Protractor Marker National Instruments’ PXI System SCB 68 used to acquire potentiometer voltage
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Servo Characteristics
Name of Servo S 3151 S 9256 Response range (ON time of pulse for which the servo responds) 0.86 ms to 2.24ms 0.46 ms to 1.14 ms Time period of signals (ms) 14 - 20 3 Angular range (degrees) 130 117 Angle traversed for every 0.1ms variation in ON time (degrees) 9 17