Resources
- The Worldwide Market for Low Voltage AC & DC Motor Drives – 2007, from The InfoShop.com, cites a study from IMS Research of this $7.6 billion dollar/year market.
- Harmonic Mitigation, from Energy Management Corporation (EMC), discusses why input harmonics must be controlled, and the costs for such control with standard technology.
- Low Operating Temperature: The Key to Motor Reliability, from the Pump-Zone.com, reveals that increasing motor temperature by 10 degrees Centigrade can cut motor life in half. The article below shows that standard Variable Frequency Drives (VFDs) can cause a 10-deg C temperature rise.
- Quote from - The Impact of Variable Frequency Drives, from Reliance Electric, a manufacturer of VFDs “Consider the potential problems-more motor noise and higher motor temperatures-when you select VFDS. Remember, though, variable-frequency drives can play important roles in systems aimed at saving energy and improving process control.”
- These and other warnings about VFDs impacts on motors do not apply to IPC’s VFDs, since our VFDs apply sinusoidal voltage to the driven motor. Motors driven by our VFDs run as quietly as they do on utility power, and just as cool as when run on utility power (although as with any variable speed application, reduced motor fan speed as the motor slows down must be offset by lower motor current, or an constant speed motor fan must be used).
- Problems Encountered With Variable Frequency Drives, from Power Quality and Drives, LLC, is a course outline on this subject. Again, all problems mentioned do not apply to IPC’s VFDs.