Among various maximum torque per ampere (MTPA) control schemes for interior permanent magnet synchronous motor (IPMSM) drives, the signal-injection-based methods exhibit relatively high overall performance due to their accuracy and satisfactory dynamic performance. However, current spectrum peaks induced by fixed-frequency signal injection may cause electromagnetic interference even audible noi...

We present an experimental method based on Ohm’s Law to calibrate the Keithley 6485 picoammeter with the calibration error less than 0.4 pico-ampere (pA), which is specified as the highest sensitivity of this instrument. The maximum calibration difference between the measurement current and the calibration current in the picoammeter’s 2 nano-ampere (nA) range is 0.25 pA. This difference is far ...

In this paper, an adaptive gain tuning rule is designed for the nonlinear sliding mode speed control (NSMSC) in order to enhance dynamic performance and robustness of permanent magnet assisted synchronous reluctance motor (PMa-SynRM) with considering parameter uncertainties. A surface whose parameters are altering time at first. The proposed NSMSC can minimize settling without any overshoot via...

Servo drives and drives for position control require a high dynamic on speed control. In this paper, model predictive direct speed control (MP-DSC) is proposed, which overcomes limitations of cascaded linear controllers. The novel concept predicts the future current and speed states in discrete steps and it selects plant inputs which depend mainly on the predicted speed error. Secondary control...

Studies investigating chair rise (CR) strategies in older adults, including the identification of CR strategies in the clinical setting, are limited. We identified biomechanical differences between CR strategies performed by older adults. The "healthy" momentum transfer (MT), the exaggerated trunk flexion (ETF), and the dominant vertical rise (DVR) CR strategies were observed in 29 women and 17...

Modern electrical traction uses asynchronous motors for driving railway vehicles because these have a lot of advantages in comparison with the classical, direct current motors. Reducing active and reactive energy consumption is concern case motors, meaning decrease exploitation costs. The research carried out shows, by results simulations, effects geometry optimization stator rotor lamination e...

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...

A novel hybrid superconducting coupling (NHSC) is proposed in this paper, which the secondary composed of copper and a split superconductor. magnetic equivalent circuit (MEC) model presented to analyze calculate distribution field torque characteristics. The 3D modeling considers end effects encountered mating. expressions flux are obtained by combining Kirchhoff’s law Ampere’s lo...