Low Maintenance and High Reliability

• Our unique alternator design with its large diameter and 32 poles allows you to run your engine at lower speed with lighter weight, higher efficiency, and longer engine life.
• Each Polar Power stator lamination stack is fully bonded to create a stator without voids which prevents moisture penetration, corrosion, and swelling. After the copper winding is in place, the entire stator assembly is varnished submersed in a class H coating then baked. This seals the metal surfaces from corrosion and improves thermal performance. This also increases resistance to salt fog. The coatings also protect the stator windings from particle abrasion and vibration.
• The steel magnet ring is 100% Nickel plated. The magnets are then bonded to the inside of the ring with high temperature aerospace grade epoxy. The purpose of Nickel plating the ring is to provide the surface with high degree of corrosion resistance, thereby preventing corrosion from starting in one area, migrating under the magnets, and creating a bond failure. The assembled magnet ring is then epoxy coated to further seal the surfaces and provide a higher degree of salt fog corrosion resistance.
• The magnets are mounted on the inside of the ring, so there are no centrifugal forces pulling against the epoxy bonds.
• There are no electronic parts (diodes, etc.) or electrical connections inside the alternator. There is nothing to short or vibrate loose inside the alternator.
• The alternator is almost impossible to damage electrically. The outputs can be shorted for minutes without damage.
• The alternator’s rotor is mated to the engine’s flywheel, and this mated pair is dynamically balanced to improve the engine’s bearing life.
• Polar Power’s PM alternator should have an MTBF exceeding 100,000 hours, as there are no parts which rub, wear, or overheat under normal operating conditions.