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Yan Verkhovskiy Phones & Addresses

  • Brooklyn, NY

Publications

Us Patents

Apparatus And Method For Testing An Electrical Circuit

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US Patent:
60754486, Jun 13, 2000
Filed:
May 21, 1998
Appl. No.:
9/082903
Inventors:
Yan Verkhovskiy - Brooklyn NY
International Classification:
G08B 2100
US Classification:
340657
Abstract:
This invention solves the problem of differentiating between a short-circuit and a low resistance value. A multi-tester impresses voltage across an LED circuit in inverse correspondence with the resistance of a subject circuit. A low-resistance voltage divider, including a circuit under test having an unknown resistance R. sub. X as a first shoulder or voltage portion, causes a threshold voltage to be impressed across the LED, thereby causing the LED to emit light for circuit resistance values at or below a maximum detectable resistance R. sub. X1. Shorts are detected by switching a shunt resister defining a second shoulder or voltage portion into parallel relationship with the LED circuit. The shunt resister has a low resistance which decreases the sensitivity of the LED to such a point that the threshold voltage is impressed across the LED for a circuit resistance R. sub. X2 of near zero amount.

Apparatus And Method For Starting And Protecting A Three-Phase Motor

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US Patent:
57965650, Aug 18, 1998
Filed:
Oct 14, 1997
Appl. No.:
8/949421
Inventors:
Yan Verkhovskiy - Brooklyn NY
International Classification:
H02H 504
US Classification:
361 29
Abstract:
Apparatus for protecting and starting a three-phase motor uses the three-phase field rotation torque produced by three voltage coils, connected to a three-phase power supply, spaced 120 degrees apart from each other, acting on an aluminum disk having a limited range of rotation. When a start button is pushed connecting the voltage coils in wye configuration, the tendency of the disk to turn is converted to an electrical signal for starting the motor. The apparatus prevents the motor from starting if phase energization is abnormal or phase rotation is not in a predetermined direction. The present apparatus also provides continuous monitoring of the motor with three-phase rotation torque produced by three current coils, which are connected in series with the motor and, in one embodiment, may be wound around the same cores as the voltage coils. The current coils generate torque tending to rotate the disk in the same direction as the torque generated by the voltage coils, thereby maintaining the motor in an energized condition, even after the start button is released. If a phase-failure or phase-reversing condition occurs while the motor is running, the invention deenergizes the motor before the motor overheats and an overload relay trips, thereby prolonging the useful life of the motor.
Yan L Verkhovskiy from Brooklyn, NY, age ~74 Get Report