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Electromagnets

PPM supply wire-wound, foil-wound and hollow-tube electromagnets manufactured by Stanganese industries.  Electromagnets range from precision low-current DC focusing magnets to 300kA pulsed coils operating at 300 kA – generating fields as high as 40 Tesla. All electromagnet types can be constructed in any shape or size with either copper or aluminium windings, enabling a variety of weight to power output ratios.

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Wire wound, foil wound or hollow tube?

Wire wound electromagnets are economical to build in low quantities and are therefore ideal for affordable prototyping / experimental applications. Foil wound electromagnets are economical to build in larger quantities and offer extremely high winding precision. Unlike wire wound, they can be sculpted to accommodate most special mounting or access needs. Hollow tube electromagnets offer the highest thermal conductance to deliver maximum heat dissipation. Hollow tube electromagnets are extremely malleable and work best for “brute strength” applications requiring high power (20 kGauss and greater).

Epoxy casting insulation

Electromagnets can be insulated using paper, film, fibreglass, b-stage, varnish, and vacuum epoxy casting insulation

Design types

Dipole, quadruple, sextuple, corrector, bending and solenoid electromagnets

Cooling

Air cooling and/or liquid cooling using water or oil running through a hollow conductor, cooling loops or cooling plates, allowing current densities as high as 15 A/mm2.

Analysis capabilities

During the design process, 2D and 3D field modelling, thermal, mechanical stress, and fluid flow analysis capabilities are available.

Testing capabilities

Axial & transverse magnetic field, hi-pot, ring, turns-ratio, pressure and flow testing capabilities

Wire wound, foil wound and hollow tube electromagnets

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Wire Wound Electromagnets

  • Copper or optional aluminium windings enable a variety of weight to power output ratios.
  • Hollow tubes are built into the coil to provide a liquid cooling layer. Depending on power consumption and duty cycles cooling may be unnecessary or provided/supplemented by forced air.
  • Square or rectangular wire options enable reduced power requirements over round wire.

Foil Wound Electromagnets

  • A super-thin insulation layer between foil windings allows fill factors (compactness) not possible with wire or hollow tube windings. Foil also spreads current more evenly throughout each coil.
  • Unlike wire wound, foil coils can be cut or sculpted to accommodate special mounting or access needs. The current path is largely undisturbed, and the impact on the magnetic field is minimal.
  • Construction in “coil sets” (rather than a single large coil) lowers build costs and enhances field accuracy and predictability.
  • Copper, aluminium or combination windings enable customised coil sizes and power to weight ratios.
  • Foil construction has high thermal conductance, enabling cooling to occur in layers between windings.

Hollow Tube Electromagnets

  • Liquid coolant flows through the entire coil length inside the hollow tube centres, allowing greater heat transfer than any other construction method and the highest field strengths with extremely small increases in temperature.
  • Non-conductive tubing carries coolant without impacting the magnetic field pattern.
  • Cooling liquid is routed in parallel, despite the necessary series path for coil current. Each coil set receives fresh incoming coolant at the same temperature.
  • Positive isolation of turns eliminates shorting, allowing low AC losses.
  • Extreme flexibility and malleability enable electromagnets of nearly any shape, including racetrack, thin pancake, open yoke and much more.

More Information?

Telephone +44 (0)1793 784389 or email: sales@ppm.co.uk