Kodak DirectView CR 825 Theory Manual page 75

THEORY GUIDE
10DEC05
TG4825-1
Page
75 of 120
The COIL BOARD A7 includes:
• 6 TRIANGULAR-SHAPED COILS of wire around the CENTRAL SHAFT of the MOTOR
• 3 HALL EFFECT SENSORS, which detect magnetic fields. The SENSORS determine the
position of the MAGNET POLES relative to the COILS.
• 3 THERMAL FUSES, which protect the components if a COIL is too hot or other
malfunctions occur
The COIL BOARD A7 and the MAGNET operate together to rotate the MOTOR.
1. The HALL EFFECT SENSORS determine the polarization of the MAGNET when the
MAGNET is aligned with the COILS.
2. The SLOW SCAN CONTROLLER BOARD A6 changes the amplitude and direction of the
current flow in the COILS to make a magnetic field.
3. The MAGNET rotates to align with the magnetic field.
4. The process continues, providing a smooth rotation of the MOTOR.
H194_5039AC
MAGNET
HALL EFFECT
SENSORS
THERMAL
FUSES
Scan/Erase