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Solar sail is a new type of spacecraft with propellantless propulsion, whose flight greatly depends on its attitude. The purpose of this paper is to present an attitude control strategy for solar sail using a gimbal boom as actuator. Focusing on the large scale but light weight flexible sail structure, a reduced rigid-flexible coupling model is established including the dynamics of actuator. Based...
Recently, there is an increasing interest in exploiting antiferromagnet (AFM) as an active element in spintronic devices arising from its advantages of negligible shape anisotropy and good thermal stability as compared to its ferromagnet (FM) counterpart. To reap these benefits of AFM, however, one must find a viable way to obtain sizable output signal from AFM and an efficient mechanism for reorienting...
Electromagnetic limited-angle torque motors (LATMs) which have a limited angular movement less than 180 degrees are widely applied in industry, particularly for positioning tasks. Compared with common rotating motors, LATMs have many advantages such as simple structure, high reliability, and uncomplicated control mode. In general, radial-flux permanent-magnet LATMs have two conventional types which...
Electric Machine is an energy conversion device, which realizes the electrical energy and mechanical energy convert to each other through electromagnetic power or electromagnetic torque. Electromagnetic torque is an important medium for this conversion progress. Thus accurate estimation or model of electromagnetic torque is desired for designing and analyzing the electric machines. Furthermore electromagnetic...
Permanent magnet synchronous machines (PMSM) have high torque density, efficiency, power factor and so on compared with other type of machines. PMSMs can be separated into traditional well-known distributed wounded (DW) machines and fractional slot concentrated winding (FSCW) machines [1]. FSCW machines own low cogging torque, compact structure, high power density, and convenient fabrication, etc...
FSCW SPM machines (SPP <1/2, such as 10-pole/12-slot), own outstanding constant power ability [1], although it was regard widely that only IPM machines can be flux-weakened deeply. SPM machines are considered as a favorite candidate for electric propulsion and vehicle application, in order to take their other advantages, such as convenient fabrication, and good controllability [2]. The constant...
By making use of all known parameters in the robot manipulator model and introducing variable structure control laws to adjust the remaining unknown parameters, a novel model reference adaptive control system is developed for robot trajectory control. The tracking errors of the joint variables will converge to zero without persistent excitation. The transient response can be prescribed in advance...
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