Welcome to the Lassonde Design Club

Promoting Design Skills and Practices

What is Engineering Design?

Politics

Sociology, psychology

Economics

Industrial Design

Architecture

Art

Engineering ScienceScience Engineering

Technology ProductionEngineering Design

What is Design?

Design is:• a systematic intelligent generation and evaluation of

specifications for artifacts whose form and function achieve stated objectives and satisfy specified constraints (Dym and Little)

More Art than Science• Science proceeds by laws (often mathmatical)• Art proceeds by intuition, experience and feeling

• Still must follow the laws of nature

Systematic Approach

Requirements for a systematic design methodology:• Be applicable to every type of design activity• Foster inventiveness and understanding• Be compatible with other disciplines• Not rely on chance• Facilitate the application of known solutions• Be compatible with electronic data processing• Be easily taught and learned• Reflect the findings of psychology and ergonomics• Emphasize the objective evaluation of results

Systematic Approach

Planning and Clarification

Conceptual Design

Embodiment Design

Detail Design

TASK

PRINCIPLE SOLUTION (CONCEPT)

PRELIMINARY LAYOUT

DEFINITIVE LAYOUT

PRODUCT DOCUMENTATION

REQUIREMENTS LIST (DESIGN SPECIFICATION)

SOLUTION

Task

Where do Design Requests come from?

• Internally• Marketing/Product Planning Department• Customer Service• Manufacturing Department

• Externally• Customer Contract

TASK

PRINCIPLE SOLUTION (CONCEPT)

PRELIMINARY LAYOUT

DEFINITIVE LAYOUT

PRODUCT DOCUMENTATION

REQUIREMENTS LIST (DESIGN

SPECIFICATION)

SOLUTION

Reference Material

Component Highlight

Stepper Motor

Stepper Motors

• Stepper Motors are a type of DC Brushless Motor• A full rotation of the motor is broken up into a number of

steps• The motor can be commanded to move and stay at any of

these steps without feedback control (open-loop)

Stepper Motors

Advantages:• Easy to control• Has full torque at a standstill• Very repeatable positioning (~3-5% of a step size)

Disadvantages:• Difficult to operate at high speeds• Relatively low accuracy (especially under load)• Low power relative to similarly sized other motors

Stepper Motors

Where are they used?• Generally used for positioning applications where loads

are low

• Examples:• Floppy disk drives• Scanners• CD drives• CNC Machines• 3D Printers