Delphi Technologies, Inc.

Curtis P Cyran

Robert J Disser

Thomas Allen Baudendistel

Donald T Morelli

Jeff Allan Foust

Bruce A Heaston

Method for operating a delta wound three-phase permanent magnet brushless motor. A transition speed is determined in a quadrant of a speed versus torque curve above which speed continues to increase while current/torque decreases wherein actual phase current can be controlled in a current control modification manner which reduces requested phase current. The modification manner is determined for a quadrant, wherein a controller can use the modification manner to reduce the requested phase current to control the actual phase current when the speed is above the transition speed. The motor is controlled in a quadrant wherein, when the motor has a speed above the transition speed, the controller reduces the requested phase current in the modification manner and the controller supplies the actual phase current to the motor using the reduced requested phase current and using measured phase current of the motor derived from using a single current sense resistor.

Method for operating a delta wound three-phase permanent magnet brushless motor

A method for detecting a change in permeability of a magnetostrictive object due to a change in strain. At least one first coil and at least one second coil are obtained and positioned such that magnetic flux lines induced by an electric current in the first coil(s) pass through at least one portion of the object in a direction substantially parallel to the strain direction, such that magnetic flux lines induced by an electric current in the second coil(s) pass through at least one portion of the object in a direction substantially parallel to the strain direction, and such that any electromagnetic interference sensed by the first coil(s) is sensed oppositely by the second coil(s). The total inductance of the positioned first and second coil(s) is measured over time. A change in permeability of the object is detected from a change in the measured total inductance over time.

Method for detecting a change in permeability of a magnetostrictive object

A resistor (having a resistance of R) is connected in series with an inductor whose inductance and/or resistance is desired to be determined. An alternating voltage (such as a sinusoidal voltage) is applied across the series-connected resistor and inductor, wherein the alternating voltage has a frequency &#x3c9;, a unique maximum or minimum value V, an average value and a unique crossover of the average value. The voltage Vis measured across the resistor when the alternating voltage is at its maximum or minimum value. The voltage Vis measured across the resistor when the alternating voltage is at its average value. The resistance Rof the inductor is calculated from an equation in which Ris a function of V, V, Rand V. The inductance L of the inductor is calculated from an equation in which L is a function of V, R, R, Vand &#x3c9;.

Methods for determining inductance and resistance of an inductor

A method and circuit for detecting a change in inductance of a variable inductance element. An oscillating signal has a frequency that varies with inductance of the element. An intermediate voltage is produced at a level that varies according to frequency of the oscillating signal. The intermediate voltage is scaled to produce an output voltage.

Growing community of inventors

Dayton, OH, United States of America

Curtis P Cyran