1,720,965 research outputs found
A Cost-Effective Switched Reluctance Motor Drive for Vacuum Cleaners
No full textA cost-effective switched reluctance motor drive for vacuum cleaners is presented in this work, as good compromise between performance and costs. Low resolution rotor position sensors are utilized in the proposed motor drive in combination with a vector tracking observer, providing an accurate control of the turn-on and turn-off angles of each motor phase, and a high bandwidth speed estimation. Effectiveness of the technical solution has been verified by experimental tests performed on a 300W switched reluctance motor drive
Iron Losses in Non-Oriented Electrical Steels Excited by Three-Level GaN PWM Inverter
No full textThis work presents an experimental evaluation of iron losses induced by a pulse-width modulation-driven three-level gallium nitride inverter in toroidal magnetic cores made of thin non-oriented electrical steel. The challenges associated with measurements at high fundamental and switching frequencies are discussed. Additionally, a comparative analysis with conventional two-level inverter technology is provided, highlighting key differences and demonstrating the potential advantages of adopting multilevel inverters. On the other hand, the loss prediction under the commonly used two-level technology supply is further presented and critically discussed
Measurements and Prediction of Iron Losses in Laminated Magnetic Cores Supplied By Ultra-High Switching Frequency PWM
Full text linkThe paper deals with measurements of iron losses in toroidally-wound laminated magnetic cores supplied by means of wide-bandgap-semiconductor-based power electronic converters. The study is aimed at investigating the impact of selected PWM parameters on the iron losses, through an extensive experimental measurement campaign; the magnetic core under test is supplied by pulse-width-modulated voltage waveforms with switching frequencies greater than 100 kHz and different deadtimes. This investigation is used for a critical review of an engineering method that was proposed in prior literature to predict iron losses in the presence of a distorted voltage supply
Investigating PWM-Induced Iron Losses. Measurements and Estimation Models up to 350 kHz Switching Frequency
Full text linkThis article deals with the investigation of iron losses in toroidally wound laminated magnetic cores excited with wide-bandgap-device-based power electronic converters. The study aims to analyze the impact of selected pulsewidth modulation voltages on the iron losses, through an extensive experimental measurement campaign. In particular, four toroidal specimens made of different magnetic materials are supplied by pulsewidth-modulated voltage waveforms with switching frequencies ranging from 1 to 350 kHz and different deadtimes. Test campaigns have been conducted with the dual objectives of critically reviewing an engineering method proposed in the prior literature for predicting iron losses under distorted voltage waveforms. Additionally, the aim is to extend this estimation model to accommodate the highest frequen- cies currently employed in high-speed ac motor drives equipped with wide-bandgap semiconductor power converters
Resolution of rotor position measurement. Modelling and impact on speed estimation
No full textThe aim of this paper is to provide an accurate modelling of the resolution of rotor position measurement and to evaluate its impact on speed estimation required for electric drive control. Starting from the space vector model of a spatially quantized rotor position measurement, the novel concept of instantaneous quantized speed is introduced, which is shown to constitute the effective input to any speed estimation algorithm. Time harmonic formulations that are valid under periodic torque disturbances are also derived. These expressions, based on modulation theory, justify the presence of otherwise unexplained time harmonics in the measured rotor position and estimated speed, which appear when the shaft is subjected to torque disturbances. Analytical and numerical results are provided on a well-known observer structure to validate the filtering action of speed estimation algorithms on the harmonics of the instantaneous quantized speed. Finally, experimental verification on a 400W permanent magnet servo drive is presented
Hall-Effect Sensor Fault Detection, Identification, and Compensation in Brushless DC Drives
No full textIn this paper, binary Hall-effect sensor faults are investigated in rectangular-current-fed brushless DC drives and a very effective methodology for their detection, identification and compensation is explored. It is shown that these faults cause erroneous commutation, generally leading to unstable operation. By using a fault detection and identification technique proposed by the authors in a recent paper on low cost field-oriented drives, it is possible to pinpoint the faulty sensors. In this paper it is demonstrated that the destabilizing effect of these faults on motion state estimation can be compensated for in any position and speed estimation algorithm, as long as it is properly readapted. To this end, it is shown how to incorporate such faultcompensation in three state-of-the-art estimation algorithms: the zeroth order algorithm, the hybrid observer, and the vectortracking observer. Comparative experimental tests are performed and it is verified that stable operation is achieved with three, two or only a single Hall-effect sensor functioning correctly. These results show that the classical BLDC drive with three Hall-effect sensors has an inherent double redundancy to position-sensor faults. With the proposed method, this property can be exploited in systems that require very high reliability, such as in aerospace and automotive applications. Redundancy can be increased, by using more than three Hall-effect sensors; reduced by using two sensors; or eliminated by using a single sensor, in ultra low-cost applications where redundancy is not a requirement
Low-cost, high-resolution, fault-robust position and speed estimation for PMSM drives operating in safety-critical systems
Full text linkIn this paper it is shown how to obtain a low-cost, high-resolution and fault-robust position sensing system for permanent magnet synchronous motor drives operating in safety-critical systems, by combining high-frequency signal injection with binary Hall-effect sensors. It is shown that the position error signal obtained via high-frequency signal injection can be merged easily into the quantization-harmonic-decoupling vector tracking observer used to process the Hall-effect sensor signals. The resulting algorithm provides accurate, high-resolution estimates of speed and position throughout the entire speed range; compared to state-of-the-art drives using Hall-effect sensors alone, the low speed performance is greatly improved in healthy conditions and also following position sensor faults. It is envisaged that such a sensing system can be successfully used in applications requiring IEC 61508 SIL 3 or ISO 26262 ASIL D compliance, due to its extremely high mean time to failure and to the very fast recovery of the drive following Hall-effect sensor faults at low speeds. Extensive simulation and experimental results are provided on a 3.7 kW permanent magnet drive
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