Ngày tải lên :
04/06/2014, 12:42
... 3
-3-7
-5.6
+3.9
2. 8
Exponent
of
power,
derived
from
tests:
x
-
1.6044
1.6
Coefficient
of
lhysteresis:
-
_
.00335
hence
theoretical
curve:
.151
.0033.5
BI6
17
11.
II.
ob)s1.
eal
c.
3030
310I
3 620
3550
4 320
4355
4830
48go
5950
6i6o
6090
6530
7850
7840
8780
9040
II,o6o
123 0
15,840
I5,340
i6,i6o
i1 ,28 0
20 ,350
19 ,26 0
20 , 620
21 ,440
23 ,180
24 , 120
av:
r2l
Al
ặTHERFORCE
22
SYEINMETZ
ON
THE
LAW
OF
HYSTERESIS.
[Jan.
19,
Here
evident
proof
of
the
induction
of
eddy-currents
in
the
iron
was
found.
Especially
perceptible
was
a
decrease
in
the
watts
consumed
by
the
iroil,
when
a
larger
M.
M.
F.
of
high
fre-
quency
was
left
acting
upon
the
iron.
This
decrease
inust
be
attributed
to
the
increase
of
the
electric
resistalnce
of
the
iron,
caused
by
its
inereasing
temperature.
To
eliminate
this
source
of
error
as
far
as
possible,
before
each
set
of
tests
an
alternating
current
of
high
frequency
(N
-
20 (0)
and
considerable
strength
was
sent
through
the
magnetizing
coils
and
left
on
for
ten
to
fifteeni
mninutes,
and
thel
fnrst
readings
witlh
low
imagiietization,
then
witlh
high,
and
theni
again
with
low
mnag-
netization
were
takeni.
But,
nevertheless,
as
was
to
be
expected,
in
these
tests
the
observed
values
agreed
less
with
each
other
thain
in
the
former
readings.
The
method
of
determinationi,
the
apparatus,
etc.,
were
the
saine
as
in
the
second
set
of
tests,
oiily
that
animeter,
voltineter,
and
wattmeter
were
used
at
the
same
time.
In
calculating
these
tests,
the
law
of
the
1.6th
power
was
assumed
as
true,
and
the
loss
of
energy
in
the
iron
expressed
by
the
equation,
11
... 18 92. ]
STEINMETZ
ON
THE
LA
W
OF
HYSTERESIS.
15
TABLE
II.
(6.)
B.
BI.
B.
H.
1000
1 52
I3,000
923 0
20 00
4 62
14,000
1I0,400
3000
884
I5,000
Il,6I0
4000
1
24 00
I6,000
12, 880
5000
20 00
27 ,000
24 ,180
6ooo
26 80
i8,ooo
25 ,550
7000
3430
19,000
16,970
8000
424 0
20 ,000
18,400
9000
5130
25 ,000
26 ,29 0
I0,000
6070
30,000
35 ,21 0
22 ,000
7070
35,000
45,o60
22 ,000
8130
40,000
55,800
II ... 757
X
10-
B.
Hi
H2
He
I
%
caic.
obs.
27 10
1,030
1 ,29 0
23 20
2, 340
-
20
-
.8
4 720
2, 510
3.910
6,430
6,480
-
50
-
.8
7540
5, 320
9,970
15 ,29 0
I5,960
-
670
-
4.4
12, 380
1I,700
26 ,800
38,500
38,500
13 ,20 0
13,000
30,400
43,400
42, 600
+
800
+
i.8
av:
6.o
+
i.6
(-
.8)
Therefrom
we
get
the
results:
N=V
78,
6
readings,
rq
.00331
e
.751
X
10-s
140,
6
"
.00331
.730
X
10-6
20 7,
5
"'
.00336
.757
X
10-8
The
values
found
for
C
are
so
nearly
alike
that
we
can
consider
them
as
constaint,
and
take
their
mean
value
-
.00333
as
the
coefficient
of
hysteresis.
Even
the
values
found
for
s
are
not
much
different
froin
eaclh
other,
not
more
than
was
to
be
expected
from
the
unavoidable
differences
in
the
temperature
of
the
iron,
which
because
of
the
high
electric
temperature
coefficient
of
iron
makes
-
rather
vari-
able.
Taking
the
average
of
e,
we
derive
=
.746
X
10-6
and
as
formula
of
iron
loss,
.H
.00333
B'-6
+
.746
X
10-6
_N
B2
In
Fig.
4
are
drawn
the
four
curves,
1.
True
hysteretic
loss,
H...