Dome Drive Electric upgrade System

Observatory Automation Project

Steven BaumanOperations M.E. Manager

DEC 13, 2010

Justification The Observatory Automation project required the

Dome Drive System to be remotely operated and provide monitoring capabilities

Conduct a Feasibility study

Things to consider

Options

Retrofit the current hydraulic system

Upgrade the current hydraulic system

Upgrade to an electronically controlled motor drive system

Or……Option #4

Hamster power!

Results from testing

Conceptual Design reviews

Assessment of the choices equally apples to apples comparison

Evaluate and Distinguish best choice

Upgrade to electronically controlled motor drive system

Upgrade the current hydraulic system

Current hydraulic system

Electric dome drive plan

Design solution to replace the hydraulic power unit and hydraulic

motors and operate the dome drive system with electronically

controlled motor units.

Specifications and

Requirements formed

Calculations and data gathering

Detailed design changes,

anticipated costs, design reviews

Beneficial Features and Improvements Increased speed

capability from 60deg/min to 72deg/min

Increased system efficiency Hydraulic system η~30% Electric system η~92%

Reduced electrical consumption

Reduced Environmental footprint

Reduction of leak hazardous

Reduced mechanical maintenance Will save 5-10k a year,

amount currently spent on hydraulic system.

Nominal cost difference between options

Reliability Can operate with one

drive out of service

Designing for the future

Design solution actuator

Hydraulic actuator

replacement

with Pneumatic actuator

Solenoid valve

• Uses building air, 100-110psi, solenoid valve draws only 2 watts of power.

Design Solution motor Drive unit

Replace Hydraulic power unit

with

Electric motor drive controller

Replace Manual control station

Hand Held Pendent

Location control cabinet

Keypad interface*Eliminates heat source on 5th floor

Location on 4th floor

Dome Gear train Components

Brevini Gear reduction

box

SHP Main shaft

assembly

SHP wheel assembly

Hydroland Hydraulic

motor

Re-use

Re-useRe-use

Replace

Baldor RPM AC 20HP motor

1750RPM3PH60HZ

Design solution Gear trainElectric motor

Adapter kit

New configuration

BreviniNema250TC Motor adapte

r flange

Rotate assembly up to achieve more clearance.

Any Additional Questions or Comments?

Thank you for your time!

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