Results 171 to 180 of about 9,782 (221)
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Irregular windings in wound rotor induction motors
Electrical Engineering, 1934The importance of using regular windings in polyphase wound rotor induction motors is stressed in this paper. Harmful effects upon the efficiency, power factor, breakdown torque and noise of the motor may result with an irregular winding, due to differential leakage. The Goerges diagram of tooth fluxes is presented for studying this phenomenon.
R. E. Hellmund, C. G. Veinott
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Control of wound-rotor induction motor with rotor impedance variation
Conference Record of the 1993 IEEE Industry Applications Conference Twenty-Eighth IAS Annual Meeting, 2002It is proposed to modify the performance of a three-phase induction motor, fed from a conventional three-phase supply of constant voltage and frequency, by the use of a network of general, slip-dependent impedances connected externally into the secondary circuit, via slip rings.
S. Lesan, W. Shepherd
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Stepless starting of wound-rotor induction motors
Transactions of the American Institute of Electrical Engineers, Part II: Applications and Industry, 1962This paper gives experimental and calculated speed-torque-current curves for a slip-ring induction motor with an automatically controlled secondary impedance to obtain stepless starting with low current, high sustained torque, and low full-load slip. A saturable reactor in the secondary circuit is supplied with a control current from a direct-connected
P. L. Alger, null Jalaluddin
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Speed regulation of induction motors with wound rotor
IFAC Proceedings Volumes, 2013Abstract The regulation of speed is required in many applications of induction motors, including in electric locomotives and electric driving vehicles. In this paper the speed control problem for a wound rotor induction motor is considered. The speed is controlled by changing the external resistance in the rotor circuit.
Solovyeva, Elena +2 more
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Losseless Starting Method For The Wound Rotor Induction Motor
ECMS 2012 Proceedings edited by: K. G. Troitzsch, M. Moehring, U. Lotzmann, 2012In heavy duty drives in the range of hundreds kW, like cement and minerals industries, wound rotor induction motors are used. Important users make use of hundred of such drives, summing hundreds of MW. This type of motors have technical capabilities to easily operate at variable speed.
Sergiu Ivanov, Mihai Radulescu
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Brush Lifting Systems for Wound Rotor Induction Motors
2018 International Conference on Applied and Theoretical Electricity (ICATE), 2018The industrial processing equipment operates with high starting torque due to inertial load. Typically, these applications use wound rotor induction motors. To ensure a high starting torque for a limited input current, these motors are started with a rheostat connected with the rotor winding. The paper presents for the first time a new system for short-
Adrian Vintila, Fevronia-Despina Roman
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Brush lifting system for wound rotor induction motors
2011 IEEE-IAS/PCA 53rd Cement Industry Technical Conference, 2011Wound Rotor Induction Motors have the rotor windings connected to an external resistance through a brush/slip ring assembly. When the brushes are in continuous contact with the slip rings during normal operation of the motor, the brushes and the slip rings experience premature wearing. This leads to frequent stops for maintenance and brush replacements.
Radha Krishna Darbha +3 more
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Hybrid speed-control system of wound-rotor induction motor
Proceedings of the Institution of Electrical Engineers, 1979A new speed-control system suitable for a wound-rotor induction motor is introduced. This system is a combination of two schemes: primary voltage control by means of bias voltage control and Scherbius control. The performance characteristics of the system are obtained and compared for the two types of speed control (new speed control system against ...
V. Pavlov +3 more
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Switching Transients in Wound Rotor Induction Motors [includes discussion]
Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems, 1954This paper presents an analysis of the transients that occur when voltage is suddenly applied across the terminals of an induction motor, with and without a connected capacitor. In wound rotor motors, the transient currents are reduced by connecting resistance in the rotor circuit, but transient voltages then appear across the slip rings.
P. L. Alger, Y. H. Ku
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A Speed Estimation Strategy for Wound Rotor Induction Motor
2018 IEEE Biennial Congress of Argentina (ARGENCON), 2018En este trabajo se presenta una estrategia de estimacion de velocidad para motores de induccion de rotor bobinado (MIRB) a partir de la medicion de la corriente de estator. La estimacion se realiza mediante el seguimiento en frecuencia de los armonicos del rotor presentes en la corriente del estator.
M. Meira +4 more
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