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  • 1
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    Axial Flux Brushless Permanent Magnet Electrical Machine Rotor (2018)
    In:  CASI
    Details
    Publication Date: 2019-08-24
    Description: An axial flux brushless permanent magnet electrical machine having a stator and at least one rotor. The rotor includes a Halbach array of magnets with at least four magnets per magnetic cycle. The rotor magnets are contained within pockets in the rotor. The pockets are formed with magnet pocket walls being radial walls, active surface walls, and/or inactive surface walls where the walls retain the magnets within the pockets.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Blood Pump Having a Magnetically Suspended Rotor (2001)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A blood pump preferably has a magnetically suspended rotor that rotates within a housing. The rotor may rotate about a stator disposed within the housing. Radial magnetic bearings may be defined within the stator and the rotor in order to suspend the rotor. The radial magnetic bearings may be passive magnetic bearings that include permanent magnets disposed within the stator and the rotor or active magnetic bearings. The pump may further include an axial magnetic bearing that may be either a passive or an active magnetic bearing. A motor that drives the rotor may be disposed within the housing in order to more easily dissipate heat generated by the motor. A primary flow path is defined between the rotor and the stator, and a secondary flow path is defined between the stator and the rotor. Preferably, a substantial majority of blood passes through the primary flow path. The secondary flow path is large enough so that it provides adequate flushing of the secondary flow path while being small enough to permit efficient operation of the radial magnet bearings across the secondary flow path.
    Keywords: Mechanical Engineering
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Magnetically suspended miniature fluid pump and method of designing the same (2000)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A rotary pump for pumping fluids through a patient having a housing with an internal region, a stator member and an impeller positioned within the housing and having impeller blades, wherein the impeller is magnetically suspended and rotated, and wherein the geometric configuration of the rotary pump is sized and proportioned to minimize stagnant and traumatic fluid flow within the rotary pump. The plurality of magnetic impeller blades are preferably rare earth, high-energy-density magnets selected from the group consisting of samarium cobalt and neodymium-iron-boron alloy.
    Keywords: Life Sciences (General)
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Blood Pump Having a Magnetically Suspended Rotor (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: A blood pump preferably has a magnetically suspended rotor that rotates within a housing. The rotor may rotate about a stator disposed within the housing. Radial magnetic bearings may be defined within the stator and the rotor in order to suspend the rotor. The radial magnetic bearings may be passive magnetic bearings that include permanent magnets disposed within the stator and the rotor or active magnetic bearings. The pump may further include an axial magnetic bearing that may be either a passive or an active magnetic bearing. A motor that drives the rotor may be disposed within the housing in order to more easily dissipate heat generated by the motor. A primary flow path is defined between the rotor and the stator, and a secondary flow path is defined between the stator and the rotor. Preferably, a substantial majority of blood passes through the primary flow path. The secondary flow path is large enough so that it provides adequate flushing of the secondary flow path while being small enough to permit efficient operation of the radial magnet bearings across the secondary flow path.
    Keywords: Mechanical Engineering
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 5
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    Adaptive identification and control for manipulators without using joint accelerations (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The authors present a new scheme for the adaptive control of mechanical manipulators along with proof of convergence. Difficulties encountered in the input-error type adaptive controller are remedied by combining an explicit identifier with discrete time updates of the parameter values along with a computed torque type control law. The new scheme requires no matrix inversion with its consequent drain on the computational power of the controller. A discussion is presented of the dynamic model of a manipulator, a computed torque adaptive scheme, an input error identifier, and a hybrid identifier.
    Keywords: CYBERNETICS
    Type: 1987 IEEE International Conference on Robotics and Automation; Mar 31, 1987 - Apr 03, 1987; Raleigh, NC; United States
    Format: text
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    NASA TECHNICAL REPORTS
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