Other

Emanuel E Shah

Sergio R Ramirez

A protection device for vertically standing lamps devices is described. The protection device consists of a switch or other means of interrupting the electrical current in case of a fall. The preferred embodiment of the invention is a normally open switch installed at the base of the lamp. This switch is closed by the action of lamp's own weight.

Safety mechanism for lamps

A zero error digital servo system where positioning is achieved by minimizing the positioning error value to zero. Stable logic states of sensors is used to achieve positioning instead of zero crossing of the error signal value. The magnitude of positioning error is reduced to a zero value by unique design of the digital encoder and positioning of the sensors. Stable logic states of the sensors indicates true position of the encoder with reference to the encoder sensors. Any deviation of the encoder from the true position is immediately detected by change in the logic states of the sensors. The technique can be used for both rotary as well as linear encoders.

Zero error digital servo system

A brushless rotating electrical machine based on a novel rotatable transformer. The motor can operate on both AC or DC. The rotatable transformer, termed brushless power unit, transfers power to the rotating armature without any physical contact and the operation of the brushless power unit is independent of speed of armature. A sensor on the armature detects the position of the armature coils in relation to magnetic neutral axis and switches semiconductor switching devices located on the armature to reverse the direction of current in the armature coils to commutate the current and produce a continuous torque. The electronic commutation is also applied to polyphase AC machines to obtain brushless operation. DC excitation system for synchronous machines can obtain brushless operation using the brushless power unit.

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Benbrook, TX, United States of America

Emanuel E Shah