We manufacture coils for all DC, traction, low voltage and high voltage rotating electrical machines, and coils for transformers of all types to IEC specifications. Transformer coils are wound on horizontal and vertical winding machines using manila or specially developed oil absorbent aramid paper, which is a Class 155 material. Rotating machine coils are looped, machine taped and formed in both resin-lean and resin-rich processes. Comprehensive tests include inter-turn, main wall insulation and surge-pulse withstand-tests to IEC specifications.
WIRE DRAWING AND COVERING
Our wire drawing and covering facility uses pure, high-conductivity copper to give us very short lead times for conductor manufacturing. Conductors for medium voltage applications are covered with mica folium tapes. Transformer conductors are covered with either conventional manila paper, or with oil absorbent aramid tape developed by LH Marthinusen and Du Pont specifically for higher operating temperatures.
We are equipped with a Trumpf® Trumatic dual-head laser cutter, De-coiler and Cut to length line and Spot welder (end/vent plates). We manufacture laminations for Stator, Rotor, Armature and Segmental laminations as well as Pole shoes (Max diameter - 1.2m).
LHM is an approved supplier to Transnet for a wide range of commutators for traction and auxilliary motor applications. Services include the manufacture of complete new commutators, rebuilds with new segment packs and existing steelwork, partial repairs including segment and/or riser replacement and replacement of mica cones and/or inter-segment mica. Work is carried out in accordance with stringent Transnet specifications. Other commutators and sliprings for mining and industrial applications are also manufactured.