Braking of induction motor with the technique of discrete frequency control

Braking of induction motor has been the subject of many researches in order to improve its performances. Many braking induction motor's strategies have been developed. Conventional braking modes are electromechanical such as braking with servo motor and counter current braking; then electrical one as direct current braking (DC). These two techniques have major drawbacks which limit their use. The first one is characterized by high braking current which reaches 7 pu and for the second one, brake torque is important only low speeds. In this paper a new electrical braking mode based on discrete variable frequency control (DFC) is suggested. Its is leading to significant reduction of braking current and improve the braking torque. The proposed strategy has been verified experimentally on a laboratory machine using induction motor feed by three phase inverter, AC thyristors monitored by a microcontroller PIC 16F867.

[1]  B. Karaliūnas,et al.  Investigation of the linear induction motor braking modes by spectral method , 2007 .

[2]  Geng Yang,et al.  Analysis and Implementation of AC Motor Braking Method without Energy Returning or Braking Unit , 2005, 2005 International Conference on Electrical Machines and Systems.

[3]  M. A. El-Sharkawi,et al.  Tracking Control Technique for Induction Motors , 1989, IEEE Power Engineering Review.

[4]  Wang Yi,et al.  Discrete variable frequency soft starting on DSP-based voltage controller-fed IM drive , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[5]  J. Ruiz,et al.  Intelligent control of the regenerative braking in an induction motor drive , 2005, 2005 2nd International Conference on Electrical and Electronics Engineering.

[6]  H.A. Ashour,et al.  Implementation and Analysis of Microcontroller Based Soft Starters for Three Phase Induction Motors , 2007, EUROCON 2007 - The International Conference on "Computer as a Tool".

[7]  Rosana Esteller,et al.  High starting torque for AC SCR controller , 1999 .

[8]  N.A.O. Demerdash,et al.  Fault Tolerant Operations in Adjustable-Speed Drives and Soft Starters for Induction Motors , 2007, 2007 IEEE Power Electronics Specialists Conference.

[9]  H. C. Specht.  Electric Braking of Induction Motors , 1912, Transactions of the American Institute of Electrical Engineers.

[10]  Henrik Mosskull.  Robust Control of an Induction Motor Drive , 2006 .

[11]  G. El-Saady,et al.  A novel technique for AC supply voltage and frequency modulation of induction motor drives , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[12]  H. Acikgoz,et al.  Dynamic braking of a voltage supplied induction motor using finite element analysis , 1997, 1997 IEEE International Electric Machines and Drives Conference Record.

[13]  Jean-Paul Hautier,et al.  Modélisation et commande de la machine asynchrone , 1995 .