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  • 1
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    Unknown
    Rotary Power Transformer and Inverter Circuit (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Noise lower than with sliprings. Rotary transformer transfers electric power across rotary joint. No wearing contacts, no contact noise, and no contamination from lubricants or wear debris. Because additional inductor not required, size and complexity of circuit reduced considerably.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-16270 , NASA Tech Briefs (ISSN 0145-319X); 9; 2; P. 52
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Split Coil Forms for Rotary Transformers (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Split cores for rotor and stator windings of rotary transformer mounted around their respective coils (which are in bobbins) and cemented together. This arrangement simplifies winding of stator coil to go in a slot in inner diameter of stator coil. One practical application of rotary transformers fabricated according to this technique is for centrifuges, in which conventional sliprings are of uncertain reliability.
    Keywords: FABRICATION TECHNOLOGY
    Type: NPO-15457 , NASA Tech Briefs (ISSN 0145-319X); 6; 4; P. 465
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetic materials selection for static inverter and converter transformers (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Different magnetic alloys best suited for high-frequency and high-efficiency applications were comparatively investigated together with an investigation of each alloy's inherent characteristics. One of the characteristics in magnetic materials deterimental in transformer design is the residual flux density, which can be additive on turn-on and cause the transformer to saturate. Investigation of this problem led to the design of a transformer with a very low residual flux. Tests were performed to determine the dc and ac magnetic properties at 2400 Hz using square-wave excitation. These tests were performed on uncut cores, which were then cut for comparison of the gapped and ungapped magnetic properties. The optimum transformer was found to be that with the lowest residual flux and a small amount of air gap in the magnetic material. The data obtained from these tests are described, and the potential uses for the materials are discussed.
    Keywords: ELECTRONIC EQUIPMENT
    Type: NASA-CR-123359 , JPL-TM-33-498
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Removing Heat From Toroidal Inductors (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Bracket for mounting toroidal inductors adapted for removing heat and providing support. Copper windings wound around bracket instead of directly on core. Heat-dissipating mounting bracket encircles hollow cylindrical magnetic core. Core wrapped with toroidal winding and encapsulated in usual way. Bracket provides direct path for heat to leave both core and windings.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-16386 , NASA Tech Briefs (ISSN 0145-319X); 9; 3; P. 41
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Ferroresonant Circuit With Increased Efficiency (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Additional inductor reduces heating and increases stability. In modified circuit small inductor in series with capacitor reduces criticality of tuning. Broadens commutating interval but decreases peak commutating current sufficiently to reduce net heating over complete cycle.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-16326 , NASA Tech Briefs (ISSN 0145-319X); 9; 2; P. 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Banded transformer cores (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A banded transformer core formed by positioning a pair of mated, similar core halves on a supporting pedestal. The core halves are encircled with a strap, selectively applying tension whereby a compressive force is applied to the core edge for reducing the innate air gap. A dc magnetic field is employed in supporting the core halves during initial phases of the banding operation, while an ac magnetic field subsequently is employed for detecting dimension changes occurring in the air gaps as tension is applied to the strap.
    Keywords: THERMODYNAMICS AND COMBUSTION
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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