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This paper presents a technique to reduce electromagnetic torque ripple of an IPMSG with fractional-slot, concentrated-winding which is connected to a rectifier and a boost converter. Firstly, the generator was controlled using DC current control of the boost converter. The generator torque ripple with this conventional method was found as 29.7% of rated torque which is significant to cause generator...
This paper presents a closed-loop control strategy for dual inverter-fed, permanent magnet synchronous motors (PMSM) with non-sinusoidal back electromotive force (back-EMF). The inverters are connected to both ends of the machine winding but use only one power source, thus providing a path for zero sequence currents to circulate in the motor windings. Due to the non-sinusoidal back-EMFs and circulation...
The power control of a novel fractional slot concentrated wound interior permanent magnet synchronous generator, directly driven by non-pitchable wind turbine emulator above base wind speeds is presented in this paper. The small scale fractional slot concentrated wound interior permanent magnet synchronous generator utilized has good flux weakening properties due to the interior permanent magnet rotor...
Many new IPMSM applications require a high level of fault tolerance. A good option for improving fault tolerance, with respect to open circuit faults, is the single DC supply open-ended winding configuration. Currently, all post-fault control techniques for three phase open-ended winding configurations assume that the IPMSM back EMF is sinusoidal. However, the majority of commercial distributed wound...
Fractional slot concentrated wound-interior permanent magnet synchronous generators (FSCW IPMSG) have potential for wind power generation application because of their high power density, high efficiency, compactness and low cogging torque. This paper evaluates the dynamic performances of a FSCW IPMSG when operated below and over the rated speed. The existing vector current control strategy developed...
The standard dq model of interior permanent magnet machines is based on the assumption of sinusoidal machine parameters. This assumption is flawed especially when a fractional-slot concentrated-wound stator is utilized. In order to address this deficiency, in this paper the non-sinusoidal machine parameters are modelled in the abc-system. An extended dq-model is then proposed based on the derived...
Fractional-slot concentrated-wound interior permanent magnet machines exhibit a reduction in the average torque and significant torque ripple under an open-phase fault condition. This arises from the spatial harmonics generated in the stator magneto-motive force due to occurrence of the fault. With the purpose of increasing the average torque, a detailed analytical model is proposed for the magneto-motive...
The direct torque and flux control (DTFC) scheme is well known for its simplicity and less parameter dependency compared to the conventional current vector control scheme. It can drive an interior permanent magnet synchronous motor (IPMSM) in usual control regimes while satisfying current and voltage limits of the motor and inverter. If the characteristic current of an IPMSM is less than the rated...
In the conventional dq model of permanent magnet machines, machine parameters are assumed sinusoidal, leading to a smooth calculated output torque. This is justifiable in distributed-wound stators. However, in permanent magnet machines with concentrated-wound stators, the assumption of sinusoidal machine parameters is no longer valid. Therefore, an extended dq model is proposed in this paper for machines...
The motivation for this paper is to present the capability of the dual inverter open-end winding of handling failures and continue to operate when failure occurs. The analysis of before failures, after failures and their effects on the system, is crucial. If nothing has been planned, the after effect of the failures may result in costly damage and may lead to another fault. The situation is undesirable...
This paper presents a closed-loop control strategy for dual inverter-fed, permanent magnet synchronous motors with non-sinusoidal back-EMFs. The inverters are connected to both ends of the machine winding but use only one power source, thus providing a path for zero sequence currents to circulate in the motor windings. If neglected, the zero sequence current can cause higher maximum peak and rms phase...
A new control approach for maximum torque per ampere control is proposed to improve the efficiency of fractional slot concentrated wound interior permanent magnet synchronous generators under light load conditions. The proposed method is compared with existing current reference trajectories (id zero, conventional maximum torque per ampere and total loss minimization) by experimentally measuring the...
Precise knowledge of machine inductances are essential in the design of controllers with adequate dynamic and steady-state performance, for concentrated-wound interior permanent magnet machines. These machines have a relatively low base speed; therefore, their high-speed operation in the field-weakening mode requires the stator windings to be excited above the rated frequency. The effect of the current...
The Fractional Slot Concentrated Winding (FSCW) configuration increases spatial harmonics of the magneto motive force (MMF) waveform of an electric machine. Therefore, saturation level in such machines is typically higher than that of the conventional machines with distributed windings. Since the characteristic of Interior Permanent Magnet (IPM) machine principally depends on inductances variation,...
Fractional slot-concentrated wound interior permanent magnet synchronous machines (FSCW- IPMSM) display high power density and high efficiency due to the short stator end windings and absence of rotor windings. The purpose of this paper is to analyze the efficiency of a 42-pole/54-slot FSCW-IPMSM under three commonly used current reference trajectory control algorithms namely zero direct axis current...
Accurate determination of the variation of inductances with respect to increase in current is necessary to characterize the behavior of a Permanent Magnet Synchronous Machine (PMSM) under saturation. This is even more crucial in the Fractional Slot Concentrated Wound Interior PM synchronous machine (FSCW IPMSM) because of increased spatial harmonics in the magneto-motive force (MMF) waveform. This...
For both power/ground and data carrying TSVs, TSV resistance is preferred to be as low as possible. Power/ground TSVs should exhibit larger TSV capacitance so that TSV can act as a decoupling capacitor while data TSVs should exhibit low TSV capacitance enabling larger data rates. Monolithic integration scheme employing the annular isolation ring to isolate the data and power/ground TSVs is proposed...
An analytical modelling technique to calculate the generated magneto-motive force (MMF) and back-EMF of fractional slot concentrated wound (FSCW) permanent magnet synchronous machines (PMSMs) is reported. The generated MMF of a FSCW stator is analyzed and modelled using a Fourier series technique. General expressions of the harmonic winding factors for FCSW stators with different slot-pole combinations...
Using one DC source for the dual inverter open-end winding topology can lead to common-mode current circulating through the DC bus connections and, to prevent motor failure, arising of EMI issue and increasing losses in the system this should be avoided. Such common-mode current flow results if there is a common-mode voltage (CMV). Therefore, in this paper, a switching scheme for the dual inverter...
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