IEE Proceedings - Electric Power Applications
Volume 141, Issue 3, May 1994
Volumes & issues:
Volume 141, Issue 3
May 1994
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- Author(s): M.-C. Tsai
- Source: IEE Proceedings - Electric Power Applications, Volume 141, Issue 3, p. 121 –128
- DOI: 10.1049/ip-epa:19941087
- Type: Article
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121
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A comprehensive analysis of the full-bridge constant-frequency LCC-type parallel resonant converter (LCC-PRC) is presented. Owing to operation under constant frequency, the filter designs are simplified and utilisation of magnetic components are improved. The LCC-PRC takes on the desirable characteristics of the pure series and the pure parallel converter, thus removing the main disadvantages. A useful analytic technique, based on classical AC complex analysis, is introduced for designing the LCC-PRC. By using a proper transformation on the state variable, the converter is analysed by means of a two-dimensional state-plane diagram, which shows that the converter possesses three operation modes (I, II, III). It is shown that operating the converter in mode II provides the desirable higher efficiency for a wide load range. A CPU (8031) is used to control the phase-shift time. Its control characteristic is very accurate and the cost is low. Finally, a constant-frequency controlled full-bridge LCC-type parallel resonant converter (LCC-PRC) using the CPU (8031) control is implemented. - Author(s): H.-L. Jou ; J.-C. Wu ; H.-Y. Chu
- Source: IEE Proceedings - Electric Power Applications, Volume 141, Issue 3, p. 129 –134
- DOI: 10.1049/ip-epa:19949938
- Type: Article
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129
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A new algorithm for a single-phase active power filter, based on calculation of the real part of the fundamental load current, is proposed in the paper. The algorithm proposed can maintain the input power factor of the mains close to unity and force the mains current to be a sinewave under distorted or nondistorted mains voltage. A prototype is developed and tested to verify its performance. The experimental results show that the algorithm proposed can compensate for the reactive power and suppress the harmonics of the nonlinear load effectively. - Author(s): E. Spooner and B.J. Chalmers
- Source: IEE Proceedings - Electric Power Applications, Volume 141, Issue 3, p. 135 –143
- DOI: 10.1049/ip-epa:19949962
- Type: Article
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135
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The paper describes the design and characteristics of high-power DC motors combining a superconducting field with a slotless, multiplex armature. This type of armature allows the motor to be designed with ratings much higher than is otherwise possible. The high-critical-temperature superconducting field winding provides a relatively simple, lightweight excitation system. A special winding is proposed as a means of avoiding torque reaction at the field winding and the resulting force which would need to be transmitted through the cryostat. The design of a 1O MW 150 rev/min motor is presented as an example and compared with a conventional design for the same specification. The superconducting, slotless machine has about half the weight and half the loss of the conventional machine. - Author(s): T.J.E. Miller and R. Rabinovici
- Source: IEE Proceedings - Electric Power Applications, Volume 141, Issue 3, p. 144 –154
- DOI: 10.1049/ip-epa:19941080
- Type: Article
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144
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The paper describes a self-consistent set of algorithms applicable to the calculation of the back-EMF waveform of any winding distribution in all the main classes of radial-airgap brushless DC motor, together with the no-load core losses. The algorithms depend on an approximation of the airgap flux-density distribution, and include new methods based on the flux linkage and EMF waveforms of a single-turn coil wound around one tooth. The paper describes the methods used to calculate these waveforms and their application to the calculation of core loss and total winding EMF. The methods are validated using test data from a range of widely different designs, and by finite-element calculations. Because of their speed and physical simplicity, the algorithms are particularly useful in integrated CAD software which simulates the operation of the complete drive system at the same time as building up the motor design from basic dimensions. The structure of the calculations is such that measured or finite-element data can easily be incorporated for checking or calibration purposes. - Author(s): S. Williamson and T.J. Flack
- Source: IEE Proceedings - Electric Power Applications, Volume 141, Issue 3, p. 155 –162
- DOI: 10.1049/ip-epa:19941088
- Type: Article
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155
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A three-dimensional finite-element model is used to investigate the effect that radial ventilation ducts have on the equivalent-circuit parameters of cage motors. It is shown that ducts change rotor resistance at starting, and an approximate method is proposed to allow for this effect. Detailed flux calculations are also used to verify some of the duct factors that are used for reactance calculations. - Author(s): P. Ellams and A.D. Mansell
- Source: IEE Proceedings - Electric Power Applications, Volume 141, Issue 3, p. 163 –168
- DOI: 10.1049/ip-epa:19941078
- Type: Article
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p.
163
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A technique is proposed for calculating preprogrammed modulation patterns for convertors having outputs comprising discrete pulses, such as the resonant DC link inverter. The problem is one of large-scale combinatorial optimisation. An algorithm based on simulated annealing is introduced which proceeds by minimising a cost function that describes the system parameters which are to be optimised. Results are presented using an example cost function appropriate for implementing an approximation to harmonic elimination. Harmonic spectra are included which allow comparisons to be made between simulated annealing, 'conventional' optimisation techniques, and sigma-delta modulation. Simulated annealing is found to allow improved control of the spectra generated by discrete pulse convertors. - Author(s): T.S. Low ; Y.P. Ding ; K.S. Lock
- Source: IEE Proceedings - Electric Power Applications, Volume 141, Issue 3, p. 169 –176
- DOI: 10.1049/ip-epa:19941079
- Type: Article
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169
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The application of the static electromechanical-spring-stiffness coefficient delta Te/ delta theta to the analysis of torque ripple is presented. Torque ripples of inverter-fed permanent-magnet synchronous motors with uniform and nonuniform airgaps are analysed. It is shown that the quadrature current not only contributes to the electromagnetic torque but also affects the torque ripple in the nonuniform-airgap permanent-magnet synchronous motor (PMSM). Controlling the currents id and iq in the manner proposed in the paper, based on the analysis, results in torques with low ripple content for PMSMs with both uniform and nonuniform airgaps.
Analysis and implementation of a full-bridge constant-frequency LCC-type parallel resonant converter
New single-phase active power filter
DC motors with high-critical-temperature superconducting field winding and slotless armature
Back-EMF waveforms and core losses in brushless DC motors
Effect of radial rotor ventilation ducts on cage motor equivalent circuit parameters
Simulated annealing in the analysis of resonant DC link inverters
Analysis and control of torque ripples in inverter-fed permanent-magnet synchronous motors using the electromechanical spring-stiffness coefficient delta Te/ delta theta
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