Magnetic Position Sensors Reed switches (sense permanent magnet) Inductive proximity sensors (eddy current) Hall Sensors (sense permanent magnet)

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Presentation transcript:

Magnetic Position Sensors Reed switches (sense permanent magnet) Inductive proximity sensors (eddy current) Hall Sensors (sense permanent magnet)

Other Discrete Position Sensors capacitive ultrasonic variable reluctance (coil around magnet, senses moving ferrous material)

Inductive Proximity Sensor

Inductive Proximity Sensors

Hall Sensors Hall effect: –constant voltage forces a constant current in semiconductor sheet –magnetic field flux lines perpendicular to current cause proportional voltage across sheet. –discovered by E.F.Hall in 1879 Linear sensor needs voltage regulator and amplifier Switch also needs threshold circuit, with hysteresis

Hall Switch Magnet motion –head-on –bypass or slide-by Total effective air gap (TEAG) Sensitivity, Hysteresis, & Temperature

Care & Feeding of Machines Feeding parts –vibratory feed bowls –conveyors –pick & place Material obtained from: –Boothroyd, Automatic Assembly –Ken Goldberg, UCB Industrial Engr Oper. Rsrch ( l) –Robert-Paul Berretty, PhD thesis, Utrecht ( )

Bowl Feeders

Design Factors –Part symmetry –Selector efficiency E=F o /F i –Recirculation effects

Bowl Feeders - Trap Design

Conveyors Orienting with pins or fences

Conveyor part orientation - pins

Conveyor part orientation - fences Any polygonal part can be oriented up to symmetry by a fence design

Conveyor part orientation - fences

Conveyor part orienting - 3D parts

Designing Parts for Feeding Symmetry Asymmetry Tangling Shingling Wedging

Symmetry

Asymmetry

Tangling

Shingling

Wedging

Designing for Insertion