4. Introduction
A stepper motor's shaft has permanent
magnets attached to it. Around the body of
the motor is a series of coils that create a
magnetic field that interacts with the
permanent magnets. When these coils are
turned on and off the magnetic field causes
the rotor to move. As the coils are turned on
and off in sequence called ‘phase pattern’
the motor will rotate forward or reverse.
5. Scope
High Speed Pick and Place Equipment
Multi axis CNC machines
Floppy disk drives
Computer printers
Plotters
Optical scanners
Conveyers
Positioning Systems
9. PCB ASSEMBLY
PCB assembly was carried out at SPOT
industries.
Process
Printing
Pick and Place (SMTs)
Manual Placement (SMTs)
Reflow Soldering (SMTs)
Placement (THTs)
Manual Soldering (THTs)
10. Operating Modes
We can control the operation mode of the
motor using SPDT. The operating modes
are:
Manual Control
Computer Controlled
11. Features
Direction Control
With appropriate combination of switches we can
control the direction of Stepper Motor in both
clockwise and anticlockwise direction.
Speed Control
Speed of the motor can be varied by changing the
resistance control knob of the variable resistor.
12. Problems Faced
Bridging of IC pins during Reflow due to
greater pad width in Layout footprint.
Mismatching of Schematic and Layout
footprint pin number.
Variable Resistor
SPDT
13. Solution
Manual detachment of IC pin.
Removed the faulted tracks and added
jumpers manually.