Last Updated：2022/12/24
Among the projects in which the B.T.C. and private firms have a common interest is the development of a satisfactory commutatorless motor; commutation difficulties with rectified d.c. for the motors of the 25 kV. a.c. multiple-unit stock, for example, have led to many experiments with and modifications of the inter-pole magnetic circuit.
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Among
the
projects
in
which
the
B.T.C.
and
private
firms
have
a
common
interest
is
the
development
of
a
satisfactory
commutatorless
motor;
commutation
difficulties
with
rectified
d.c.
for
the
motors
of
the
25
kV.
a.c.
multiple-unit
stock,
for
example,
have
led
to
many
experiments
with
and
modifications
of
the
inter-pole
magnetic
circuit.
