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Aiming to increase vehicle performance, a method for thermal monitoring of critical drive components is presented. Using the example of an integrated starter-generator (ISG), with integrated clutch module and an internal combustion engine (ICE) attached, a finite element method-based thermal model is introduced. Based on this numerical model, which is verified using measurements, the thermal behavior...
A simplified analysis of influence of pole pairs on the steady-state behavior of induction motors is presented. The analysis makes simplifying assumptions to express relationship between key steady-state performance parameters of 2-pole reference motor compared to its multiple pole counterparts. The analysis is performed using considerations of fixed geometrical dimensions on one hand and fixed output...
The paper describes an improved method to control a Pseudo Direct Drive (PDD) permanent magnet machine with only one sensor on the low-speed rotor (LSR). Due to the magnetic coupling between the two rotors, the PDD machine exhibits low stiffness and non-linear torque transmission characteristics, and hence, the position of the high-speed rotor (HSR) cannot be determined using simple gearing ratio...
A cascaded brushless doubly fed induction machine (CBDFIM) drive with the same active rotor volume and comparable extended constant torque and constant power regions as those of the doubly fed induction machine (DFIM) is proposed and theoretically demonstrated. To achieve the appealing goal, the drive system is configured to supply the power winding with a constant voltage constant frequency (CVCF)...
In this paper, optimal waveforms to control constant instantaneous torque of switched reluctance motors while minimizing copper losses are computed by using the pattern search as an optimization algorithm. Optimal torque sharing using two quadratic and one linear functions is proposed to approximate the optimal torque waveforms accurately. The optimal torque sharing was verified with a 3.75 kW, 3820...
This paper presents a high performance control of interior permanent magnet synchronous motor (IPMSM) incorporating a neuro-fuzzy controller (NFC) coupled with a loss minimization algorithm (LMA). Among numerous LMAs, a loss model based controller (LMC) offers fast response with minimum torque pulsations. Thus, an LMC is developed in this work to optimize the efficiency of the drive while an adaptive...
The on-load voltage distortion in interior permanent magnet (IPM) machine refers to the terminal voltage distorted by armature reaction. In this paper, the mechanism of the on-load voltage distortion have been investigated with the aid of frozen permeability method based on both fractional and integer slot IPM machines. It reveals that the local magnetic saturation caused by armature reaction will...
In order to verify the possibility for practical application of vernier motor, a motor with surface PM configuration has been designed for use in a commercial washing machine. First, a previously existing PM motor with an outer rotor, is investigated by using its equivalent circuit parameters. Next, the circuit parameters of vernier motor are formulated in terms of practical design variables. A new...
This paper presents design process of the rotor to obtain a variable-flux flux-intensifying interior permanent magnet machine (VFI-IPM) with improved torque quality and reduced magnetization current. The VFI-IPMs have attracted much attention because the magnetization state of the permanent magnets can be adjusted according to load conditions. By applying a d-axis pulse current to magnetize the PMs...
This paper presents a sensor-less vector control method which estimates the rotor angle and speed of a nine-phase, Interior Permanent Magnet (IPM) machine with concentrated stator winding, especially for use at starting, zero and low speed operations. The injection of unique high frequency voltage signals into a non-torque producing third sequence circuit of the machine provides current information...
The paper presents a study of an Integrated Multi-Drive (IMD) system, obtained by redesigning the stator winding of a standard electrical machine to derive a combination of several Sub-Machines (SMs). A single SM consists of an independent three-phase stator winding set sharing a common magnetic circuit including the rotor with the other SMs. Exploiting independent vector control for each SMs, the...
This paper proposes a controller design method for ac motors operating under the maximum torque per voltage (MTPV) condition to explore the available inverter voltage. The control algorithm is developed based on a hexagon voltage manipulating control (HVMC) method to select a truncated output voltage command satisfying the maximum torque generation under the voltage deficit region. The proposed method...
Magnetic gears are able to transmit torque between an input and an output shaft without mechanical contact. As for electrical drives, torque density, acoustic noise and torque ripple are of primary concern. This paper describes the influence of the pole numbers on the radial forces and the cogging torques. We show how continuous and discrete skewing can suppress torque harmonics effectively. Further,...
This paper proposes the current reconstruction method in the single current-shunt inverter (SCSI) during the six-step modulation. Since the voltage vectors of the six-step operation are placed in the immeasurable areas of SCSI, the phase current cannot be reconstructed in the conventional researches. However, by changing the position of the sampling period, the current signal can be reconstructed...
The paper presents an investigation into the effects of wind and grid conditions on the dynamic behaviours and the interactions between the electrical, mechanical and control components of a 3MW variable-speed wind turbine. All the components of the drivetrain have been modelled with sufficiently high fidelity, and it has been shown that extreme wind and grid conditions, such wind turbulence and grid...
The performance of doubly-fed induction generators (DFIGs) would be affected by the rotor winding inter-turn short circuit fault, such as harmonics increase in electromagnetic quantities and torque pulsation. Thus, it is necessary to monitor and diagnose the rotor inter-turn fault for DFIGs. However, the rotor three-phase windings inherent imbalance and static air gap eccentricity may cause misdiagnosis...
In order to pre-validate control strategies of wind energy conversion system (WECS), wind turbine simulators (WTS) are usually adopted to simulate the output characteristic of field wind turbines (WT) in the laboratory. Since the moment inertia of WTS is smaller than that of a practical WT, an inertia emulation scheme has been applied in WTS to replicate the dynamic behavior of real WT. In this paper,...
Soft-stall control of small wind turbines is a method to protect the generation system or the load from high wind speeds while keeping the system generating. Soft-stall activation must be due to an excess of power or torque/current. This paper proposes a method to improve the existing soft-stall methods for over torque/current protection by the development of a turbine torque estimator. Due to the...
The following work introduces the use of a nine-switch back-to-back topology, for its use with multiphase permanent magnet synchronous generator, based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual channel back-to-back three-phase voltage source converter capable of controlling two sets of three-phase variables without voltage limitations when operating...
This paper presents the validation of a MPPT technique, based on a Growing Neural Gas (GNG) network, for high performance marine current generator with induction machine, in presence of torque oscillations caused by time and space variation of the turbine operating conditions. The unsteady torque delivered by a notional turbine working in the presence of waves and of sea bottom boundary layer is obtained...
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