Low Operating Temperatures Coupled
With A Premier Insulation System Heat is the largest factor leading to premature insulation failure - the larger the buffer between the actual motor temperature and the temperature rating of the insulation
system is, the longer the insulation life will be.
Hyundai’s approach for a reliable insulation system is to use Class N varnish, which is rated for 200°C and limits the temperature rise to ~74°C. This results in a larger buffer
between the actual temperature and what the insulation system can handle without
breaking down. With a 40°C ambient and a motor running at the nameplate load this
buffer for an HHI motor is a whopping 86°C (200-74-40 = 86). Compare this to a typical
motor with an 80°C rise and Class F insulation, the buffer is only 35°C (155-80-40=35).
Remember the old adage, for every 10°C cooler electrical products run, the life expectancy
of the insulation system doubles. An 86°C buffer is a big deal if you want a motor that will last a long time.
Summary - Hyundai motors run cooler and provide a larger buffer of protection for the
insulation system which results in long life. An additional benefit of this design allows
you to apply a stock motor in higher ambient conditions and still provide a good buffer. Model Number
FL Eff (%) 93.6
Approx Wt. (lbs.) 380
Stock Item Delivery is 2 to 5 days from order
Vibration leads to premature bearing failure and can damage the coupled equipment. Hyundai’s approach to a low vibration motor ... Shoot for less than half of the NEMA requirement, don’t cut cost with lighter weight end bells, machine all motors with a precise foot flatness and use only the best bearings.
NEMA requires a finished motor to have a vibration level that does not exceed .15 inch/second peak. Hyundai’s conservative approach sets the target at ~.07 inch/second peak. All motors are precision balanced, feet are machined to a flatness of ~0.005”, end bells are heavily ribbed and only premium bearings such as NSK, SKF or FAG are used.
Summary - heavy cast iron frames, precision balance rotors and precise foot flatness leads to lower vibration and thus longer bearing life and less damage to other equipment.