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IEE Proceedings B - Electric Power Applications

Issue 3 • May 1992

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Displaying Results 1 - 15 of 15
  • New approach for the analysis of a three-phase induction motor of different ratings connected to a single-phase supply

    Publication Year: 1992, Page(s):145 - 154
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (699 KB)

    The problem of operating a three-phase induction motor connected to a single-phase supply system using two convertors is discussed. Special attention is focused on the starting torque and minimum unbalance requirements for different motor power ratings. A new approach is suggested concerning the calculation of the starting and running sizes of the convertors, to enable the motor to start under ful... View full abstract»

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  • Application of EKF to parameter and state estimation of PMSM drive

    Publication Year: 1992, Page(s):155 - 164
    Cited by:  Papers (25)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (828 KB)

    The authors describe the application of the extended Kalman filter theory to the parameter and state estimation of a permanent-magnet synchronous motor drive for a microprocessor based adaptive speed control in the presence of a variable load. The electronically commutated permanent magnet synchronous motor is controlled according to the principle of field orientation. An adaptive torque/speed cas... View full abstract»

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  • Induction motor parameter estimation algorithm using spectral analysis

    Publication Year: 1992, Page(s):165 - 174
    Cited by:  Papers (21)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (998 KB)

    A computationally economic online parameter estimation algorithm for the induction motor is described. The parameters are derived from only those signal components most relevant to the parameters being calculated, to achieve conciseness and good mathematical stability of the algorithm. Using spectral analysis, it is shown to be possible to design online test methods that resemble the standard offl... View full abstract»

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  • Slotless armature DC machines with multiplex connection

    Publication Year: 1992, Page(s):175 - 182
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (745 KB)

    The slotless armature has been shown to give greatly improved commutation in DC machines. The use of multiplex windings allows the designer to take advantage of the improved commutation to increase the maximum power/diameter ratio from about 2 MW/m to about 6 MW/m. With a conventional slotted armature, multiplex connection can lead to problems of irregular distribution of voltage around the commut... View full abstract»

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  • Control loop study of a load commutated CSI-fed induction motor

    Publication Year: 1992, Page(s):183 - 190
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (529 KB)

    The authors present a systematic study for the induction motor drive system using a load commutated current source inverter (LCCSI). The steady state characteristics of a LCCSI-fed induction motor are shown to be the intermediate characteristics between the voltage source inverter (VSI) and the autosequentially commutated current source inverter (ASCI) systems. The dynamic characteristics of the L... View full abstract»

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  • Modelling and dynamic performance of variable-frequency-fed induction motors

    Publication Year: 1992, Page(s):191 - 196
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    The authors present a transfer-function representation of a variable-frequency-fed induction motor based on a linearised mathematical model. Small changes in speed or electromagnetic torque are related to small changes in input voltage, frequency and load torque. The transfer functions enable step responses to be computed for sudden step changes in input voltage, frequency and load torque. Variati... View full abstract»

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  • High-performance speed controller for voltage-source inverter-fed induction motor drives

    Publication Year: 1992, Page(s):220 - 226
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (587 KB)

    A linear model following control system with variable-control law for voltage-source inverter-fed induction motor drives is proposed. The drive system is implemented, and an estimation technique is developed to find its dynamic model from the measured-step rotor speed response. In the proposed controller, the plant is approximated by two reduced submodels with very low orders, which are found to g... View full abstract»

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  • Constant frequency, two-stage quasiresonant convertor

    Publication Year: 1992, Page(s):227 - 237
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (803 KB)

    The authors are concerned with an investigation of an unusual circuit that can be used for DC to DC conversion, with conversion frequencies in the region of 1 MHz. It consists of two quasiresonant circuits in cascade. The special feature of the circuit is that the control and regulation techniques for it take place at constant frequency. An analysis of the idealised circuit is presented, and chara... View full abstract»

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  • Interturn voltages in machine windings evaluated from on-site test results and computer simulation

    Publication Year: 1992, Page(s):238 - 244
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (751 KB)

    Interturn voltages produced in the line-end coils of machine windings when steep-fronted prestriking transients reach the winding are usually predicted by injecting a simple ramp-function voltage wave into a computer simulation of the winding. In practice, steep-fronted prestriking transients have complex waveforms, and it is possible that a simple ramp function does not adequately represent such ... View full abstract»

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  • Analogue simulation of a DC brushless drive

    Publication Year: 1992, Page(s):245 - 251
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (619 KB)

    A technique of analogue simulation is presented and discussed. The proposed technique is applied to a DC brushless drive. For every part of the system under simulation, a proper description is furnished, and the corresponding circuit in the simulator is described. Particular attention is given to simulation of motor variable parameters and disturbances due to switching of drive power semiconductor... View full abstract»

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  • Spread spectrum switching: low noise modulation technique for PWM inverter drives

    Publication Year: 1992, Page(s):252 - 260
    Cited by:  Papers (67)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (774 KB)

    Electric motors operated on fixed period PWM waveforms emit objectionable, predominantly tonal, acoustic noise in addition to the more usual motor noises. Spread spectrum switching is presented as a technique which effectively 'breaks up' the characteristically tonal noise of a PWM drive, replacing it with a wideband atonal noise. This is achieved by pseudorandomly varying the instantaneous PWM sw... View full abstract»

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  • Computer-based optimisation techniques for mass transit signalling design

    Publication Year: 1992, Page(s):261 - 275
    Cited by:  Papers (6)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1488 KB)

    The authors present an attempt to harness the vast processing power available in modern computers to the task of assisting signal design engineers with the layout and performance assessment of various signalling systems, particularly as applied to metro systems. The primary aspects considered are the minimum headway and line capacity dictated by the dynamics of the train following, particularly ac... View full abstract»

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  • Distortion power in systems with nonsinusoidal voltage

    Publication Year: 1992, Page(s):276 - 280
    Cited by:  Papers (13)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (465 KB)

    The distortion powers, also termed deformation power, is one of the fundamental power quantities in circuits with nonsinusoidal voltages and currents, and power properties of such circuits are often specified in terms of this power. The notion of distortion power and its relation to the waveforms distortion is the main subject of the paper. It is shown that the necessary condition for the lack of ... View full abstract»

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  • Fixed-voltage thyristor convertor rolling-stock transformers to control DC traction motors

    Publication Year: 1992, Page(s):209 - 219
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1056 KB)

    The more recent use of power thyristors on AC railway vehicles, with their facility for controlling the DC output, has simplified the traction transformer in that it need only be of a constant ratio. However, the demands of the thyristor circuit designer can still impose some transformer design problems, particularly when a variety of different output windings are required. The mechanical arrangem... View full abstract»

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  • Variable-voltage diode convertor rolling-stock transformers to control DC traction motors

    Publication Year: 1992, Page(s):197 - 208
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1404 KB)

    The first generation of traction transformers used on railway vehicles in the UK, which went into service in the early 1960s, transformed the 50 Hz overhead supply voltage of 25 kV or 6.25 kV down to an acceptable voltage for diode convertors supplying DC traction motors. They also had to vary the output voltage by providing voltage tappings on the transformer windings, selected by on-load tapchan... View full abstract»

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