<s>
A	O
vibration	B-Algorithm
powered	I-Algorithm
generator	I-Algorithm
is	O
a	O
type	O
of	O
electric	O
generator	O
that	O
converts	O
the	O
kinetic	O
energy	O
from	O
vibration	O
into	O
electrical	O
energy	O
.	O
</s>
<s>
Vibration	B-Algorithm
powered	I-Algorithm
generators	I-Algorithm
usually	O
consist	O
of	O
a	O
resonator	O
which	O
is	O
used	O
to	O
amplify	O
the	O
vibration	O
source	O
,	O
and	O
a	O
transducer	B-Algorithm
mechanism	O
which	O
converts	O
the	O
energy	O
from	O
the	O
vibrations	O
into	O
electrical	O
energy	O
.	O
</s>
<s>
The	O
transducer	B-Algorithm
usually	O
consists	O
of	O
a	O
magnet	O
and	O
coil	O
or	O
a	O
piezoelectric	O
crystal	O
.	O
</s>
<s>
Electromagnetic	O
based	O
vibration-powered	B-Algorithm
generators	I-Algorithm
have	O
been	O
commercialized	O
.	O
</s>
<s>
Future	O
improvements	O
on	O
the	O
size	O
of	O
the	O
device	O
could	O
make	O
it	O
an	O
ideal	O
power	O
source	O
for	O
medically	O
implanted	O
devices	O
such	O
as	O
pacemakers	B-Device
.	O
</s>
<s>
According	O
to	O
the	O
team	O
that	O
created	O
the	O
device	O
,	O
the	O
vibrations	O
from	O
the	O
heart	O
muscles	O
would	O
be	O
enough	O
to	O
allow	O
the	O
generator	O
to	O
power	O
a	O
pacemaker	B-Device
.	O
</s>
<s>
In	O
2012	O
a	O
group	O
at	O
Northwestern	O
University	O
developed	O
a	O
vibration-powered	B-Algorithm
generator	I-Algorithm
out	O
of	O
polymer	O
in	O
the	O
form	O
of	O
a	O
spring	O
.	O
</s>
<s>
Piezoelectric	O
based	O
generators	O
use	O
thin	O
membranes	O
or	O
cantilever	O
beams	O
made	O
of	O
piezoelectric	O
crystals	O
as	O
a	O
transducer	B-Algorithm
mechanism	O
.	O
</s>
<s>
These	O
mechanisms	O
can	O
be	O
manufactured	O
using	O
the	O
MEMS	B-Architecture
fabrication	O
process	O
,	O
which	O
allows	O
them	O
to	O
be	O
created	O
on	O
a	O
very	O
small	O
scale	O
.	O
</s>
