/public/

Subsystem Design

Table of Contents 1 Team Vision for Subsystem-Level Design Phase 1.1 Plan 1.2 Accomplishments 1.3 Three Week Plan 2 Feasibility: Prototyping, Analysis, Simulation 2.1 Motor Benchmarking 2.2 Required Motor Specifications 2.3 Calculations of Moment of Inertia - 2D Linear Actuators 2.4 Calculations of Moment of Inertia - 2D Rotational Motors 2.5 Calculations of Moment of Inertia - 1D Linear Actuators 2.6 Calculations of Moment of Inertia - 1D Rotational Motors 2.7 Moment of Inertia - Calculated Values 3 Electrical Design 4 4 Options and Bill of Materials (BOM) 5 Risk Assessment 6 Design Review Materials 7 Plans for next phase 8 Subject Matter Experts

Team Vision for Subsystem-Level Design Phase

Plan

Our goal of the subsystem design phase was to focus on the most critical aspect of the design, the motors.

Accomplishments

Our team was able to finish motor benchmarking and compile a list of four different concepts with different motor options. These concepts were then complied into a spreadsheet where they were compared to what engineering requirements each one would meet, as well as a preliminary BOM for each concept. We were also able to come up with a preliminary electronics design, and narrow down our microcontroller list.

Three Week Plan

Feasibility: Prototyping, Analysis, Simulation

Motor Benchmarking

Linear Actuators

Rotational Motors

• Key: Dark Orange: Optimal; Light Orange: Marginal.

All motors in the optimal and marginal selections meet engineering requirements for resolution and torque. These motors may not meet requirements of velocity and/or cost. The prices reported do not include required controllers, but the bill of materials does include these required controllers.

Required Motor Specifications

Calculations of Moment of Inertia - 2D Linear Actuators

Calculations of Moment of Inertia - 2D Rotational Motors

Calculations of Moment of Inertia - 1D Linear Actuators

Calculations of Moment of Inertia - 1D Rotational Motors

Moment of Inertia - Calculated Values

Electrical Design

In determining the layout of the electrical design, a broad level view was taken and elaborated on. There were 3 possible options in setting up the motor and each has a potential subsystem. Option 1 utilizes only a microcontroller which in turn controls the motor via a voltage regulator such as in Alpha Team's original design. This isn't necessarily practical for motors of extreme accuracy and thus Options 2 and 3 contain motor controllers from their respective companies. The microcontroller can either connect to the motor controller such as in Option 2 or be completely bypassed such as in Option 3. Option 2 retains the standalone aspect of the design, as the microcontroller/microcomputer can be powered and utilized independently of a desktop computer while still controlling the motor controller and motor.

The method of communication used will be primarily serial using either USB or RS232. Of the top candidate motors that have been benchmarked, many recommend or require their own motor controller to achieve maximum motor performance. These motor controllers also offer their own programmable software which can connect to a microcontroller/microcomputer via RS232 or USB respectively. Further design details will be created once a design choice has been made.

4 Options and Bill of Materials (BOM)

The four concepts include:

These are the Bills of Materials for different concepts.

Risk Assessment

Please click the image to get a bigger view.

Design Review Materials

Links for:

• Subsystem Design Review Presentation here

• Subsystem Design Review Handout here

• Subsystem Design Review Presentation With Chosen Motor Specific to Jeff Pelz here

Plans for next phase

3 week plan here!

Subject Matter Experts

Who We Met With	What We Talked About
Dr. Lam Dr. Kempski Dr. Schertzer Dr. Lamkin-Kennard Dr. Schrlau	Discussed servo motors, and referred us to Dr.Kempski. Gave us a few names of companies, and a book all about motors. Mentioned a piezo stack and the Iron Triangle. Mentioned New Scale Technologies, in Victor NY. Gave us previous MSD teams EDGE pages to look at.

We would like to acknowledge the time taken out of each Subject Matter Expert's busy schedule to talk to us, thank you.

---

Home | Planning & Execution

Problem Definition | Systems Design | Subsystem Design | Preliminary Detailed Design | Detailed Design

Build & Test Prep | Subsystem Build & Test | Integrated System Build & Test | Integrated System Build & Test with Customer Demo | Verification & Validation | Final Gate Review