Company Filing History:
2 out of 179 
2 out of 448 
Years Active: 1987-1992
Title: Roy D Hoffer: Innovator in AC Motor Drive Systems
Introduction
Roy D Hoffer is a notable inventor based in Lancaster, PA (US), recognized for his contributions to the field of motor drive systems. With a total of 4 patents to his name, Hoffer has made significant advancements in the technology surrounding single-phase PSC motors.
Latest Patents
Hoffer's latest patents include innovative designs for AC motor drive systems. One patent describes a motor drive system for driving a single-phase PSC motor, where the two motor windings are conductively isolated from each other, utilizing a two-phase power source. In this embodiment, the PSC motor is supplied from a two-phase inverter circuit and can be connected through a four-pole double-throw switch to either a single-phase source with a run capacitor or the two-phase inverter circuit. Another patent outlines a similar motor drive system for a conventional single-phase PSC motor, which is driven from a two-phase power source. This design features a three-phase inverter controlled to generate two-phase power, allowing the PSC motor to be connected through a double-pole double-throw switch to either a single-phase source or a two-phase inverter source.
Career Highlights
Throughout his career, Hoffer has worked with prominent companies such as York International Corporation and Armstrong World Industries, Inc. His experience in these organizations has contributed to his expertise in motor technology and innovation.
Collaborations
Hoffer has collaborated with notable individuals in the industry, including Frank E Wills and Harold R Schnetzka, II. These partnerships have likely enriched his work and led to further advancements in his field.
Conclusion
Roy D Hoffer stands out as an influential inventor in the realm of AC motor drive systems. His innovative patents and career achievements reflect his dedication to advancing motor technology.