Company Filing History:
Years Active: 1998-2003
Title: Innovations by Thomas M Ligman
Introduction
Thomas M Ligman is an accomplished inventor based in Santa Barbara, CA. He holds 2 patents that showcase his expertise in electric vehicle technology and motor control systems. His innovative contributions have significantly impacted the field of transportation and motor engineering.
Latest Patents
One of Ligman's latest patents is for an electric vehicle drive system. This invention features an electrically assisted bicycle that includes a motor current sensor for controlling a transistor switch in the motor circuit. The circuitry establishes a duty cycle and switching rate, monitoring the duty cycle to shut off the motor when it approaches an inappropriate level, such as 50%. Additionally, when the bicycle is pedal-driven, the voltage generated by the motor is monitored to complete the motor control circuit when the bicycle reaches a speed of 4 miles per hour.
Another notable patent is for a motor control system for variable speed induction motors. This control system utilizes microcontroller control means to provide a variable frequency signal, deriving high side and low side phase signals from it. Power is applied from an AC/DC converter to the motor through an output drive bridge with three pairs of high side/low side semiconductor switches. The system is designed to protect the motor and control electronics from excessive current levels and overheating, ensuring efficient operation.
Career Highlights
Throughout his career, Thomas M Ligman has worked with several companies, including Phase III, Inc. and Electric Transportation Company. His experience in these organizations has allowed him to develop and refine his innovative ideas in electric vehicle technology.
Collaborations
Ligman has collaborated with notable individuals such as James R Ligman and Warren E Dennis, contributing to the advancement of technology in their respective fields.
Conclusion
Thomas M Ligman's contributions to electric vehicle technology and motor control systems demonstrate his innovative spirit and commitment to advancing engineering solutions. His patents reflect a deep understanding of the complexities involved in modern transportation systems.