Gary R Fisher is a notable inventor based in Los Angeles, CA. He holds a total of 13 patents that showcase his contributions to technology and innovation. His work primarily focuses on advancements in aquarium technology and motor control systems.

Latest Patents

One of his latest patents is titled "Dynamic reef surge generation." This invention discloses two apparatuses designed to provide a dynamically varying water surge in a salt-water reef aquarium. The first apparatus features a micro-controller based variable frequency reef surge drive for an AC permanent magnet synchronous motor (PMSM) submersible aquarium pump. It includes voltage conversion circuitry, a micro-controller, a reef-surge generation program, a variable frequency drive, a mode switch, and a tidal cycle switch. Three user-selectable modes of operation are provided: a random frequency mode, a fixed-program mode, and a tidal mode. The second apparatus comprises a novel submersible AC PMSM pump with dual impeller assemblies and dual input and output chambers, supporting forward and reverse flow through the pump.

Another significant patent is "Variable frequency drive for AC synchronous motors with application to pumps." This invention reveals two apparatuses for controlling the speed of an AC synchronous motor-pump using a series of stepped voltage pulses at the driving frequency. The first apparatus is an isolated variable frequency drive that includes a step-down transformer, full wave rectifier and filter, micro-controller, driving-voltage array generator, gate driver, inverter bridge, and step-up transformer. The second apparatus is a non-isolated high voltage variable frequency drive comprising a full wave rectifier and filter, low voltage dual output power supply, micro-controller, driving-voltage array generator, gate driver, and inverter bridge. Methods are provided to determine voltage array values and pulse times to generate a stepped voltage approximation of a sine wave driving waveform.

Career Highlights

Throughout his career, Gary has worked with various companies, including Armchair World. His innovative spirit and technical expertise have led to significant advancements in his field.

Collaborations

Gary has collaborated with notable individuals such as Murty V Mantravadi and Chris S Brunt. Their combined efforts have contributed to the development of groundbreaking technologies.

Conclusion

Gary R Fisher is a distinguished inventor whose work has made a lasting impact in the fields of aquarium technology and motor control systems

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