UK solenoid manufacturer
BLP have been one of the leading uk
solenoid manufacturers for the last
50 years. Initially the solenoids were
developed and sold under the PED brand
but are now manufactured and sold as
BLP solenoids..
What is a solenoid
Basically a solenoid
consists of a coil with an associated
iron circuit forming the fixed part.
A moving plunger is pulled into this
coil when it is energised. The pictures
below show a basic open frame solenoid
with a thrust pin, this solenoid can
be used as a pull type if the load
is attached at the plunger end (thick
end).
Solenoids can be
manufactured in range of sizes, frames
and mounting styles. BLP manufacture
a large range of open frame and tubular
solenoids. ( click
here for Tubular solenoids)
Open frame solenoids
The diagram and picture above shows
a standard thrust (or push type), open
frame solenoid being cycled on and off.
When the solenoid is energised the PLUNGER
will be attracted to the STOP. The majority
of solenoids are open frame or 'D' frame
solenoids. BLP also manufacture a range
of tubular solenoids.
Pull and Thrust Solenoids
Solenoids have
an electromechanical pull action.
This pull action can be converted
to a pushing action by fitting a suitable
thrust pin or plunger extension as
shown above. The pull type plunger
pulls in and stops at the STOP, with
no extension coming out of the other
end.
AC or DC Solenoids
Often the choice
is predetermined by the supply available.
Where there is a choice these factors
should be considered.
· AC solenoids tend to be more
powerful in the fully open position
than DC solenoids. This is due to
the 'inrush current' which at maximum
stroke can be more than ten times
the closed current.
· AC solenoids must close completely
so that the inrush current falls to
its normal value. If an AC solenoid
sticks in the open position a coil
burn-out is likely. DC solenoids take
the same current throughout their
stroke and cannot overheat through
incomplete closing.
· AC solenoids are usually
faster than DC operated solenoids,
DC solenoids are slower but they repeat
their closing times accurately against
a given load.
· A good AC solenoid correctly
used should be quiet when closed but
only because it's fundamental tendency
to hum has been overcome by correct
design and accurate assembly. Dirt
on the mating faces or mechanical
overload may make it noisy. A DC solenoid
is naturally quiet.
Solenoid Voltage Requirements
Again this choice
will be predetermined by the supplies
available. A solenoid can be wound
for any voltage between the limits
of unreasonably fine wire for high
voltages and wire too thick to handle
for the very low voltages.
Where a choice is available it should
be remembered that a low voltage coil
tends to give more power than one
for high voltage, and is more robust
as it uses heavier wire.
6, 12, 24V DC solenoids
are standards. Other voltages are
available as options.
110, 230V AC solenoids
are standards.
Wattage - Temperature
All units in this
catalogue are designed on the basis
of a maximum allowable input wattage
without exceeding a 105ºC (221ºF)
stabilised coil temperature when operated
at the rated duty cycle in a 20ºC
(68ºF) ambient.
|
