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US20040190881: Electrical resonance circuits for high efficiency direct current motors


Filing Information

Inventor(s) Marcus Smith ·
Assignee(s) None listed in document.
Application Number US10817835
Filing date 04/06/2004
Publication date 09/30/2004
Predicted expiration date 10/24/2021
U.S. Classifications 388/800  ·
International Classifications H02P005/00  ·
Kind CodeA1
16 Claims, 15 Drawings


Practically ideal electrical resonance is employed to soley provide armature power, and stator power if desired, to run DC motors. A practically ideal parallel resonant tank circuit (PIPRC) is used wherein the quotient of the “tank current” divided by the “line current” (called the “quality” or “Q” of the tank) is (1) greater than one, (2) large enough to allow the percent efficiency of the electric motor to be equal to or greater than 95%, and (3) removes enough back emf or enough of the influence thereof so that criteria (1) and (2) can be realized throughout the entire operating range of the motor. Only one PIPRC is needed for a DC motor. Recontrolling and/or redesigning is done for two reasons. First, since DC motors change effective impedance, because of back emf variations, when their speed changes, controls are implemented to ensure that the tank circuit always meets criterion (3), and therefore criteria (1) and (2), thereby maintaining a PIPRC, regardless of how frequent or to what degree speed is changed. Secondly, this first control has the effect of negating the normal ability of a D.C. motor to draw different currents for driving different loads. Therefore, the way current is supplied to the motor is also recontrolled.

Independent Claims | See all claims (16)

  1. 1. (Cancelled)
  2. 2. (Cancelled)
  3. 3. (Cancelled)
  4. 4. (Cancelled)
  5. 5. (Cancelled)
  6. 6. (Cancelled)
  7. 7. A DC motor constructed and arranged to be driven by an AC power source, the DC motor comprising: a main armature, a primary stator and output shaft; a secondary armature on the output shaft, the secondary armature having an armature core which has substantially the same number of windings as the main armature, each winding of the main armature being dedicated to the removal of the AC voltage on one main armature winding.
  8. 13. (Cancelled)
  9. 14. (Cancelled)
  10. 15. (Cancelled)
  11. 16. (Cancelled)

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