ece department sdp07 team members:chad baldi julian salai allan maina linwood williams team advisor:...
Post on 21-Dec-2015
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ECE Department SDP07
Team Members:Chad BaldiJulian SalaiAllan MainaLinwood Williams
Team Advisor: Professor Omid Oliaei
FanSafe
2ECE Department SDP07
Origin of Idea
SawStop® technology• Capacitive based touch sensor
SawSafe • Chainsaw based proximity sensor
FanSafe• Industrial fans
3ECE Department SDP07
Concept
Human proximity detector• Electric field sensing
Stop the motor• Safety precaution
4ECE Department SDP07
Kirchhoff’s Voltage Law
5ECE Department SDP07
Marketability
Protective grill not needed• Easily cleanable
• Low accumulation of allergens and dust• Visual aesthetics
Industrial applications• Maximize air flow• Safety
6ECE Department SDP07
General Layout
Electrode Sensors
Sensor Circuit
Multi-Channel Slip Ring
Motor Stop Control Board
7ECE Department SDP07
MDR Specifications
Acquire fan Plans for sensor placement Analog sensing Interference Options in signal processing Data transfer solution
8ECE Department SDP07
MDR Specifications
Fan selection• Fan blade material• Size • Cost
9ECE Department SDP07
MDR Specifications
Sensor placement• Electrode / Shield material• Insulator material • Location on fan blade• Mount configuration• Coaxial connector type
10ECE Department SDP07
Fan Blade Sensors / Coax Components
11ECE Department SDP07
MDR Specifications
Analog Sensing• IC settings & properties• Use of Shield• Sensor specifications
12ECE Department SDP07
Sensor Circuit
Fan Blade Sensors
13ECE Department SDP07
Sensor Video
14ECE Department SDP07
MDR Specifications
Interference & Noise• Noise created in optimization of distance. (P-P 20mV)• No noise from AC Motor
15ECE Department SDP07
MDR Specifications
Signal processing concepts• Serial ADC• PIC processor• Noise averaging• Slope algorithm
16ECE Department SDP07
MDR Specifications
Data Transfer• Multiple port slip ring
• Power input to circuit• Sensor digital output
17ECE Department SDP07
Next Step
Acquire slip ring• Number of connections• Hallow ring• Possibly self made (cost/noise)• Needed for on-fan testing (priority)
SLIP RING
FANPCB
MOTOR PCB
VDD
AGND
DGND
DATA
18ECE Department SDP07
Next Step
Develop PCBs• Need for on-fan testing• Decide on A/D sampling rate• Resolve shielding issues
19ECE Department SDP07
Next Step
PIC processing code• With on-fan testing create processing algorithm
• Algorithm developed to detect proximity & kill noise
20ECE Department SDP07
Next Step
Motor stop relay• Develop process to stop motor • Timing may be critical • Possible mechanical brake technique
21ECE Department SDP07
FanSafe
Thank You.