The problem being taken up is, the speed servo control of a PMDC motor. The reference input is continuously changing and also the load torque on the motor shaft is continuously varying. A control law based on the load torque is proposed. The Computed Torque Control scheme is used. The load torque, being of unknown kind, cannot be sensed and hence it has to be estimated. The load torque is estim...

Aim: To evaluate the loss of applied torque (detorque) values in cast and pre-machined abutments for external hex abutment/implant interface of single implant-supported prostheses subjected to mechanical cycling. Methods: Ten metal crowns were fabricated using two types of UCLA abutments: cast and pre-machined with metal base in NiCrTi alloy and tightened to regular external hex implants with a...

In the previous paper in ICAT2002, we reported that a non-grounded palm-top torque display "GyroCube" was developed. Although it requires no grounding base for supporting the counter torque to the objective one, and consequently is suitable for mobile use, it generates superfluous negative resetting torque after presenting the objective one in terms of principle. When the control voltage is inc...

In recent years, the areas of industrial application of AC drives, especially Induction machine based on DTC technique has gradually increased due to its advantages over the other techniques of control. In conventional direct torque control, the selection of flux linkage & electromagnetic torque errors are made within the respective flux and torque hysteresis bands in order to obtain fast torqu...

The transfer of spin angular momentum from a spin-polarized current to a ferromagnet can generate sufficient torque to reorient the magnet’s moment. This torque could enable the development of efficient electrically actuated magnetic memories and nanoscale microwave oscillators. Yet difficulties in making quantitative measurements of the spin-torque vector have hampered understanding. Here we p...

Harvesting light for optical torque is of significant importance, owing to its ability to rotate nano- or micro-objects. Nevertheless, applying a strong optical torque remains a challenging task: angular momentum must conserve but light is limited. A simple argument shows the tendency for two objects with strong mutual scattering or light exchange to exhibit a conspicuously enhanced optical tor...

The space vector modulation (SVPWM) of Brushless DC motor (BLDC) is different from that of permanent magnet synchronous motor for its turn-off phase and trapezoidal back electromotive force. To overcome these problems, a SVPWM method is presented in this paper. The application of SVPWM to Brushless AC drives has been investigated extensively. This paper describes its application to BLDC drives ...

BACKGROUND The isokinetic dynamometer has been considered the gold-standard measurement of muscle performance. However, the reliability for the passive mode in children has not been reported to date. OBJECTIVES The purpose was to evaluate the reliability of the isokinetic dynamometer in passive mode in children. METHOD Twenty-one healthy children (ten girls, eleven boys), aged 5 to 12 years...

This paper presents a new control structure to reduce torque ripple in switched reluctance motor. Although SRM possesses many advantages in motor structure, it suers from large torque ripple that causes some problems such as vibration and acoustic noise. In this paper another control loop is added and torque ripple is de ned as an objective function. By using fuzzy sliding mode strategy, the DC...

This paper proposes design and simulation of Direct Torque Control of Induction Motor drive system is to minimize stator current distortion, electromagnetic torque and flux ripples. In this paper, Fuzzy Logic Controllers are proposed to replace the classical PI torque and flux controllers to achieve desired torque and flux with zero steady state error and also with good dynamic tracking and fas...