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The cost function of finite control set model predictive torque and flux control uses a weighting factor to determine the trade-off between the torque and flux magnitude tracking errors. The choice of this weighting factor strongly influences the current distortions. It will be shown that the optimal weight, which minimizes the current distortions, can be computed algebraically. Furthermore, using...
This paper deals with the optimal state reference calculation for synchronous motors with a magnetically salient rotor. A look-up table computation method for the maximum torque-per-ampere (MTPA), maximum torque-per-volt (MTPV), and field-weakening operation is presented. The proposed method can be used during the drive start-up, after the magnetic model identification. It is computationally efficient...
In this paper, we investigate rotor and stator designs of interior permanent synchronous motors for variable speed/load applications to reduce the carrier harmonic losses caused by pulse width modulated inverters. The rotor core and magnet shapes are determined by an automatic optimization method using electromagnetic field analysis that considers the inverter carrier. Appropriate stator-winding configurations...
This paper proposes a novel reluctance axis shifted (RAS) machine with hybrid rotors, i.e., permanent magnet (PM) and synchronous reluctance parts, respectively. The proposed design is geometrically characterized by two axially parallel rotors, which enables the full utilization of reluctance and magnet torque components for torque improvement. In the proposed design, the reluctance axis coincides...
A rotating electric machine built entirely of sustainable lightweight materials is presented for rotary actuator applications. The machine uses electrostatic forces instead of magnetic, enabling different materials. Here, aluminum, plastic, and printed circuit boards are used as they are low cost and easily recycled at end of life. The electrostatic machine developed is of the axial flux variety,...
In this paper a prototype brushless doubly-fed reluctance machine is investigated which is aimed a meeting commercial machine performance figures. The machine has 4 and 8 pole 3-phase stator windings and a 6 pole radially-laminated ducted rotor. The machine is investigated using finite element analysis (FEA), static torque tests with DC current excitation, a MATLAB/Simulink model, and experimentally...
In this paper, the impact of transmission gear ratios selection on a Nissan Leaf EV (NLEV) is investigated. The traditional single ratio gearboxes are replaced by multiple ratio ones. The selection of the gear ratio is proved to have a significant impact on electric vehicle's performance and range. A mathematical model of a NLEV is developed for both single and multiple ratio transmission systems...
This paper proposes a modulated model predictive control (MMPC) algorithm for a brushless double-fed induction machine. The Brushless Doubly-Fed Induction Machine has some important advantages over alternative solutions for brushless machine applications. The proposed modulation technique achieves a fixed switching frequency, which gives good system performance. The paper examines the design and implementation...
The design of the first stage of a 59:1 multistage magnetic gearbox for a wind turbine demonstrator is presented. The multistage magnetic gearbox (MSMG) is composed of a two stage magnetic gearbox (MG). The first stage of the MSMG has a gear ratio of 6.45. A spoke type MG rotor typology is used with a unique segmented fully laminated rotor structure. Axially segmented magnets and a unique set of radial...
A comparison of noise reduction currents in 36-24 and 18-12 switched reluctance motors in all operating region is presented. Radial force profile in these two machines are compared. It is seen that the difference in radial force profile causes different optimized current to reduce the noise in switched reluctance motor. Analysis, simulation, and experimental results are presented to verify the proposed...
This paper proposes an analytical method to quantify the effects of current and position sensor errors on torque ripple of a switched reluctance machine (SRM). First, an instantaneous torque equation for SRM is derived using the Fourier series representation. Then, analytical models are developed to describe the non-idealities of current and position sensors in the drive system. The electromagnetic...
This paper analyzes the convergence of the rotor position tracking in signal-injection sensorless control especially for heavily saturated IPMSMs. In the analysis, it is revealed that the harmonic inductance and the operating current variation are critical factors determining the operation limit of signal-injection sensorless control. Considering this, the feasibility region of signal-injection sensorless...
Permanent Magnet Synchronous Machine (PMSM) torque control over a wide speed range is essentially an optimization problem that treats torque error minimization as the objective function with inverter voltage and current as constraints. It is usually time consuming and difficult to solve such optimization problem for closed-form solutions since torque, voltage and current equations are all non-linear...
This paper presents a new study on the comparison of dual-rotor single-stator (DRSS) and dual-stator single-rotor (DSSR) axial flux-switching permanent magnet (AxFSPM) machines. The DRSS and DSSR AxFSPM machines have the same dimensions except for stator and rotor yoke lengths. 3-D finite element analysis (FEA) and experimental verification are used for the comparison study. The comparison results...
This paper presents a separation method to discern broken rotor bar fault from low frequency load torque oscillation thorough radial leakage flux spectrums in induction motors (IMs). Broken rotor bar fault can usually be detected using classical motor current based analysis (MCSA), but it may not provide reliable results since its performance depend on motor topology, stator winding and load type...
In permanent magnet servo motors, each component has a certain temperature limit. For on-machine device with electronic components, like the high resolution optical encoder, the temperature limit is commonly less than 125°C. While for the motor body, the winding and the magnets usually have higher temperature limit. During continuous operation, the encoder temperature, rather than the winding or magnet...
Equivalent circuit parameters are very important for permanent magnet synchronous machines since they serve as the basis for performance estimation and implementation of power electronic drives controls. Specified in the newly approved IEEE Std 1812, a short-circuit test can be employed, in combination with an open-circuit measurement, in order to determine the back emf and the synchronous inductance...
Steady-state motor efficiency control has been shown to provide significant motor loss savings and efficiency improvement. Including adjustable speed drive inverter losses into the steady-state motor control optimization is also of interest. What is shown here is the effect that these two efficiency improvement schemes have on the distribution of losses between the motor and the inverter when an efficiency...
This paper presents a novel methodology investigating a characteristics of variable leakage flux interior permanent magnet synchronous machine (VLF-IPM) using arc-shaped magnets. In general, motor parameters such as magnet flux, Ψa, inductances on d-q axes, Ld and Lq, are dealt as constant values, while motor parameters need to be dealt as variables depending on load currents for VLF-IPM machines...
For automotive applications, accurate torque production capability and high efficiency of the traction motor is very important. However, the performance of widely used interior permanent magnet (IPM) machine is influenced by temperature variation. In this paper, a control algorithm is proposed to compensate the performance variations in IPM machines due to temperature change utilizing current pulse...
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