Now showing items 1-13 of 13

    • Capactive power circuit 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1998-12-22)
      A circuit for controlling power to a capacitive load includes a DC power source coupled in series with an inductor and the capacitive load. The inductor provides for resonant charging of the capacitive load from the DC ...
    • Electric machine having a high-torque switched reluctance motor 

      Holtzapple, Mark T.; Rabroker, George A.; Fahimi, Babak; Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 2010-02-16)
      According to one embodiment of the present invention, an electric machine comprises a stator and a rotor. The stator has at least one stator pole with a first leg and a second leg. The rotor has at least one rotor pole. ...
    • Electric machine having rotor and stator configurations 

      Holtzapple, Mark T.; Rabroker, George A.; Fahimi, Babak; Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 2011-09-20)
      According to one embodiment of the present invention, an electric machine comprises a stator and a rotor. The stator has at least one stator pole with a first leg and a second leg. The rotor has at least one rotor pole. ...
    • Electrically peaking hybrid system and method 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1996-12-24)
      A series hybrid electric-combustion system is provided which includes an engine (16) operable to generate mechanical energy and translate it to a drive shaft (21). A battery (24) is included that is operable to store ...
    • Indirect rotor position sensor for a sinusoidal synchronous reluctance machine 

      Ehsani, Mehrdad; Arefeen, Mohammed S.; Lipo, Thomas A. (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1995-09-05)
      A discrete position sensor elimination technique for a sinusoidally wound synchronous reluctance motor drive uses induced voltage, phase currents, and excitation frequency to estimate rotor position at all speeds, including ...
    • Inverse dual converter for high-power applications 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1993-05-04)
      An inverse dual converter circuit (20) provides continuous voltage step-up or step-down control over a wide range and without the need of a transformer. The converter comprises an input DC voltage source (22) for generating ...
    • Method and apparatus for reducing noise and vibration in switched reluctance motor drives 

      Ehsani, Mehrdad; Fahimi, Babak (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 2005-07-26)
      According to one embodiment of the invention, a method includes generating, by a computer, a phase current profile, generating a phase current according to the phase current profile, and applying the phase current to the ...
    • Method and apparatus for sensing the rotor position of a switched reluctance motor 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1995-04-25)
      Apparatus and method for detecting rotor (12) position in a switched reluctance motor (18) having multiple stator phases (A-A', B-B', and C-C'). A multiplexer (48) intermittently connects a known resistor (54) to a ...
    • Method and apparatus for sensing the rotor position of a switched reluctance motor without a shaft position sensor 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1994-03-01)
      Apparatus and method for detecting rotor (12) position in a switched reluctance motor (18) having multiple stator phases (A--A', B--B', and C--C'). A multiplexer (48) intermittently connects a known resistor (54) to a ...
    • Position sensor elimination technique for the switched reluctance motor drive 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1991-12-10)
      Rotor position information for a switched reluctance (SR) motor drive is obtained indirectly in response to the motor phase inductance. An oscillator generates a signal having a time period that is a function of the ...
    • Power conversion using zero current soft switching 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 1994-02-15)
      A zero current soft switching power converter (10) is provided in which a link capacitor (20) is coupled between a source switch S1 and a source switch S2. The reversal of voltage polarity across link capacitor (20) allows ...
    • Self-tuning control of switched-reluctance motor drive system 

      Ehsani, Mehrdad (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 2002-10-29)
      A system and method for controlling a switched-reluctance motor, in which a control variable is selected for controlling a figure of merit of the motor. The motor is then operated at a first value of the control variable. ...
    • System and method for inductance based position encoding sensorless SRM drives 

      Ehsani, Mehrdad; Gopalakrishnan, Suresh (United States. Patent and Trademark OfficeTexas A&M University. Libraries, 2006-08-22)
      A controller (72) for a switched reluctance machine (20) implements a model of at least one active phase representing dynamic magnetic machine characteristics. The controller (72) determines machine control signals based ...