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Design,development, and fabrication of a reaction wheel utilizing a brushless motor
Reaction wheel system development with tachometer and commutator design
Control of brushless DC Torquer - Reaction wheel. Part A.
Attitude control by means of reaction wheel driven by photoelectronically commutated DC torquer
Brushless commutation - Comeback for dc motors.
Electronically switched DC motor commutated by light beam directed onto photodiodes
An advanced brushless dc torque motor Quarterly report, 30 Sep. - 30 Dec. 1966
Design of torque motor controller, and operation of breadboard control circuit
A brushless despin drive and control for a communication satellite antenna
Spin reducing mechanical drive and control system for steering communication satellite antenna
Design and development of a brushless, direct-drive solar-array reorientation system Final report - Phase 1
Development of breadboard model of automatic controller for solar array reorientation system for stabilized spacecraft
A brushless dc torquer-driven reaction wheel for spacecraft attitude control
Photoelectronic commutation by dc torquer-driven reaction wheel for spacecraft attitude control
Hall effect encoding of brushless dc motors
Encoding mechanism integral to the motor and using the permanent magnets embedded in the rotor eliminates the need for external devices to encode information relating the position and velocity of the rotating member.
Brushless DC motor with dual windings
Motor has high starting torque and high running speeds. Control system consists of Hall effect generator/resolver and associated electronic amplifiers and switches. Motor operation is described.
An ironless armature brushless torque motor
A high torque motor with improved servo mechanism is reported. Armature windings are cast into an epoxy cylinder and armature conductors are integrally cast with an aluminum mounting ring which provides thermal conductance directly into the structure. This configuration eliminates magnetic hysteresis because there is no relative motion between the rotating magnetic field and any stationary iron. The absence of destabilization forces provides a fast electrical response compared with a typical torquer of conventional construction.
Ironless-armature brushless motor
Device uses 12-pole samarium cobalt permanent-magnet rotor and three Hall-effect sensors for commutation. In prototype motor, torque constant (3-phase delta) is 65 oz-in/amp; electrical time constant (L/R) is 0.2 x 0.001 sec, and armature resistance is 20 ohms.
Design of a samarium cobalt brushless dc motor for electromechanical actuator applications
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Numerical simulation of dynamics of brushless dc motors for aerospace and other applications. Volume 1: Model development and applications, part A
The development, fabrication and evaluation of a prototype electromechanical actuator (EMA) is discussed. Application of the EMA as a motor for control surfaces in aerospace flight is examined. A mathematical model of the EMA is developed for design optimization. Nonlinearities which complicate the mathematical model are discussed. The dynamics of the EMA from the underlying physical principles are determined and a discussion of similating the control logic by means of equivalent boolean expressions is presented.
Numerical simulation of dynamics of brushless dc motors for aerospace and other applications. Volume 2: User's guide to computer EMA model
A description and user's guide of the computer program developed to simulate the dynamics of an electromechanical actuator for aerospace applications are presented. The effects of the stator phase currents on the permanent magnets of the rotor are examined. The voltage and current waveforms present in the power conditioner network during the motoring, regenerative braking, and plugging modes of operation are presented and discussed.
Brushless Cleaning of Solar Panels and Windows
Machine proposed for cleaning solar panels and reflectors uses multiple vortexes of air, solvent, and water to remove dust and dirt. Uses no brushes that might abrade solar surfaces and thereby reduce efficiency. Machine can be readily automated and can be used on curved surfaces such as aparbolic reflectors as well as on flat ones. Cleaning fluids are recycled, so that large quantities of water and solvent are not needed.
Brushless Low-Speed dc Tachometer
Proposed tachometer produces voltages proportional to shaft angular velocity and (by differentiation) acceleration. Coil moving in homopolar field generates emf proportional to shaft angular velocity.