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  • 1
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    Motor/generator and electronic control considerations for energy storage flywheels (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A spacecraft electric power supply system is described. Requirements of the system are to accelerate a momentum wheel to a fixed maximum speed when solar energy is available and to maintain a constant voltage on the spacecraft bus under varying loads when solar energy is not available. Candidate motor types, pulse width modulated current control systems, and efficiency considerations are discussed. In addition, the Lunar Roving Vehicle motors are described along with their respective efficiencies.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NASA. Langley Research Center An Assessment of Integrated Flywheel System Technol.; p 389-406
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Flywheel Electronics (1983)
    In:  CASI
    Details
    Publication Date: 2014-09-11
    Description: Requirements of the flywheel electronic system are to accelerate the momentum wheel to a fixed maximum speed when solar energy is available and to maintain a constant voltage on the spacecraft bus under varying loads when solar energy is not available. Requirements, energy flow control, types of motors considered, type of electronic control, and efficiency considerations, are outlined.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Langley Research Center Integrated Flywheel Technol., 1983; p 105-116
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Solar powered actuator with continuously variable auxiliary power control (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A solar powered system is disclosed in which a load such as a compressor is driven by a main induction motor powered by a solar array. An auxiliary motor shares the load with the solar powered motor in proportion to the amount of sunlight available, is provided with a power factor controller for controlling voltage applied to the auxiliary motor in accordance with the loading on that motor. In one embodiment, when sufficient power is available from the solar cell, the auxiliary motor is driven as a generator by excess power from the main motor so as to return electrical energy to the power company utility lines.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NAS 1.71:MFS-25637-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Motor power control circuit for ac induction motors (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A motor power control of the type which functions by controlling the power factor wherein one of the parameters of power factor current on time is determined by the on time of a triac through which current is supplied to the motor. By means of a positive feedback circuit, a wider range of control is effected.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Three phase power factor controller (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A power control circuit for a three phase induction motor is described. Power factors for the three phases are summed to provide a control signal, and this control signal is particularly filtered and then employed to control the duty cycle of each phase of input power to the motor.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Solar-Powered Flywheel (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Energy-storage system has 20 year lifetime. Electrical power source consisting of flywheel and electronic control system stores solar energy. Flywheel developed for space vehicles features good weight-to-energy storage ratios and used as control gyroscope for maneuvering.
    Keywords: MACHINERY
    Type: MFS-25978 , NASA Tech Briefs (ISSN 0145-319X); 8; 3; P. 400
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Control system for an induction motor with energy recovery (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A control circuit for an induction motor powered system is disclosed in which a power factor controlled servo loop is used to control, via the phase angle of firing of a triac, the power input to the motor, as a function of load placed on the motor by machinery of the powered system. Then, upon application of torque by this machinery to the motor, which tends to overspeed the motor, the firing angle of the triac is automatically set to a fixed, and relatively short, firing angle.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Control Electronics for Solar/Flywheel Power Supply (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Control circuit automatically directs flow of electrical energy to and from motor with flywheel that constitutes storage element of solar-power system. When insolation is sufficient for charging, power is supplied by solar-cell array to load and motor. During periods of darkness, motor made to act as generator, drawing kinetic energy from flywheel and supplying it to load.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: MFS-25978 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 57
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Three-phase power factor controller with induced EMF sensing (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A power factor controller for an ac induction motor is provided which is of the type comprising thyristor switches connected in series with the motor, phase detectors for sensing the motor current and voltage and providing an output proportional to the phase difference between the motor voltage and current, and a control circuit, responsive to the output of the phase detector and to a power factor command signal, for controlling switching of the thyristor. The invention involves sensing the induced emf produced by the motor during the time interval when the thyristor is off and for producing a corresponding feedback signal for controlling switching of the thyristor. The sensed emf is also used to enhance soft starting of the motor.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: NAS 1.71:MFS-25852-1
    Format: application/pdf
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  • 10
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    Phase detector for three-phase power factor controller (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A phase detector for the three phase power factor controller (PFC) is described. The phase detector for each phase includes an operational amplifier which senses the current phase angle for that phase by sensing the voltage across the phase thyristor. Common mode rejection is achieved by providing positive feedback between the input and output of the voltage sensing operational amplifier. this feedback preferably comprises a resistor connected between the output and input of the operational amplifier. The novelty of the invention resides in providing positive feedback such that switching of the operational amplifier is synchronized with switching of the voltage across the thyristor. The invention provides a solution to problems associated with high common mode voltage and enables use of lower cost components than would be required by other approaches.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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