Modern Mass-produced Quartz Movement
The number of components in a quartz clock
and their manufacturing complexity has been reduced over the years. There
is very little metal in this 1990s quartz movement, and lots of plastics.
The electronics are largely in an integrated circuit (no external transistors)
and the stepper motor is a much more efficient device allowing the clock
to be run on a single AA cell for well over a year. There is no need
for lubrication, and repair is not usually possible.
The electronics produce a short pulse of alternate polarity every second
which is passed through the coil. The two metal arms are then magnetized
N-S on one pulse and S-N on the next, which drives the small magnetized
rotor between them round by 180 degrees each second.
||one LR6/MN1500/AA size cell
Copyright Text & Pictures - Martin Ridout. Last updated