Redesign for Obsolescence

1
Redesign for Obsolescence

• Xerox University of Rochester
• Presenter
• David Karasiewicz

2
Description

• Problem
• PWM H-bridge motor Drive has gone EOL
• End of Life Buy
• Review possible drop in replacements
• Redesign the effected assemblies
• Assembles Effected
• HCF/SMH
• DADF

3
Description Continued

• Task
• Redesign the effect assembles such that they are
  drop in replacement.
• Carry the implementation through to end product
  cut-in.
• Goals
• Bring forward old design
• Review all components for potential EOL issues
• Improve manufacturability

4
Requirements

• Assembly
• Form, Fit, and Function of present assemblies.
• No SW or FW changes
• Motor Driver requirements
• 24VDC, Current limited at 2.5A, Bidirectional,
  Dynamic Braking, PWM
• End Product to meet EMC
• EN55024 CISPR 22 Class B
• FCC Part 15 Class B

FOR Details see project proposal
5
Team/Resources

• Project Eng is David Karasiewicz
• Equipment
• Scopes, Power Supplies, Life test fixture
• Environmental chambers
• EMC chamber
• PWB layout by MSL
• PWBA manufacture is Apsco International

6
Cost Estimates

• Internal
• Engineering 65 40 8 20,800
• Support Organization 8,500
• Safety and EMC 3,850
• External
• Manufacturing
• ICT test fixture 13,800 3 41,400
• NRE 1,150 3 3,450
• Sample Units 385 30 11,550
• PWB Layout
• MSL design support 3,200 3 9,600

7
Schedule

Jan 05Product intentparts in house
April 16BA Complete
Oct 01Peer Review
Aug 25Product Cut-in
March 1BA ImpactingPrints Completed Testing
Completed
Oct 31Design completedLayout starts
Aug 15Start Design
8
Current Status

• First set of production intent parts received
• Preliminary EMC testing passed
• No foreseeable delays
• Issues
• Key Engineer Resource