ELECTROMAGNETS / ELECTRIC HOLDING MAGNETS (EM)
Electromagnets or electric holding magnets develop their high attraction force towards magnetic materials when they are energized. The applications are manifold – wherever ferrous parts have to be fixed during processing or assembly, or ferrous parts have to be attracted or transported. However, electromagnets are most commonly used as holding mechanisms for fire doors or other safety devices.
Since the field decreases very strongly even at a small distance, the emphasis in production of electric holding magnets is on very good flatness and an extremely thin coating is chosen. This also applies to the optionally available armature plates. China Electromagnets MK-P8/20
The following basic properties can be specified for the electric holding magnets of the EM series:
five sizes with 25mm, 32mm, 40mm, 50mm and 80mm diameter
holding force up to 2100N (powered on in stop position)
high holding force at low power
standard windings for 12Vdc or 24Vdc
flexible cable outlet to the side or to the rear
Options for the electric holding magnets:
ejector Pin: preloaded spring pin to overcome residual magnetism, reduces holding force by approx. 10%
custom windings for series requirements
further sizes for series production
armature plate (soft iron, nickel-plated) as magnetic counterpart
type power holding force
@ 20 C° holding force,
d xh mass optional
armature plate data
W N N mm g .pdf .igs
EM0025 3.0 150 140 25 x 20 60 AP27
EM0032 4.0 280 250 32 x 20 90 AP34
EM0040 5.5 500 450 40 x 27 200 AP42
EM0050 6.0 750 660 50 x 30 400 AP52
EM0080 12.5 2100 1800 80 x 40 1450 AP82
*warm = constant temperature, achieved in calm air by nominal voltage.
After switching off, a residual magnetism of approx. 5% of the Nominal holding force maintained.
type AP27 AP34 AP42 AP52 AP82
diameter (+/-0.2mm) 27mm 34mm 42mm 52mm 82mm
h 4mm 5mm 5mm 6mm 8mm
threaded bolt M4 x P0.7mm M4 x P0.7mm M6 x P1.0mm M6 x P1.0mm M8 x P1.25mm
total height (+/- 1.2mm) 18mm 18mm 20mm 20mm 25mm
*ATTENTION: in the new design a threaded rod is used instead of the internal thread!
HOLDING MAGNETS WITH ELECTRIC RELEASE (HMER)
Holding magnets with permanent magnets permanently develop a high attraction force against magnetic materials which are brought into their immediate vicinity by the permanent magnet. In addition, however, they have an electric coil with which the field of the permanent magnet can be neutralised, i.e. switched off, when the correct voltage is applied.
Like all electric holding magnets, they are used to fix ferrous parts during machining or assembly, to attract and transport ferrous parts.
At present, we do not offer a standard HMER series; examples of manufactured components:
HMER0040-24: holding force >200N, 24Vdc supply voltage, dimensions d= 40mm, h = 27mm
HMER4928-12: holding force >600N, 12Vdc supply voltage, dimensions d= 49mm, h = 28mm
HIGH POWER HOLDING MAGNETS (SMPD)
Like the electric holding magnets, the permanent magnet-based holding magnets also develop a high attraction force towards magnetic materials – but without current and cannot be switched off. Like electric holding magnets, holding magnets are used to fix ferrous parts, e.g. during assembly processes or on the pin board. Our holding magnets use strong magnetic materials and are therefore characterised by a high force density.
type SMPD 00100 SMPD 00101 SMPD 00102 SMPD 00103 SMPD 00104 SMPD 00163 SMPD 00105 SMPD 00164
diameter (mm) 6 8 10 13 16 20 25 32
height (mm) 20 20 20 20 20 25 35 40
holding force (N) 6 10 40 60 125 250 400 600