Inverters used to control a motor’s speed or torque — also known as variable frequency drives (VFDs) or adjustable speed drives — can induce unwanted motor shaft voltages that cause premature motor ...

All major manufacturers of three-phase ac induction motors offer “inverter-duty” or “inverter-ready” models, but while these motors have inverter-rated insulation to protect the windings, the bearings ...

More inverters are coming to the end of their life, and needing replacement, as the solar photovoltaic (PV) industry matures. Inverter failures usually occur on systems that are 10-plus years old. At ...

Things fail with age, whether they be cars, phones or inverters. Alencon, an optimizer manufacturing company out of Hatboro, Pennsylvania has published a white paper looking at the failure rate of ...

The vast majority of bearing failures in electric motors and electric motor-driven equipment are due to mechanical and thermal causes. However, currents that flow through induction motor bearings can ...

Article 690 covers solar installations, except large-scale ones (those are covered in Article 691) [Sec. 690.1], as shown in Fig. 1. There are three important definitions: “Photovoltaic (PV) system” ...