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Juri Jatskevich - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic average-value modeling of 120° VSI-commutated brushless dc motors with trapezoidal back EMF
    2013 IEEE Power & Energy Society General Meeting, 2013
    Co-Authors: Kamran Tabarraee, Juri Jatskevich
    Abstract:

    Summary form only given. The 120° voltage source inverter (VSI) driven brushless dc (BLDC) motors are very common in many applications. This paper extends the previous work and presents an improved dynamic average-value model (AVM) for such BLDC motor-drive systems. The new model is explicit and uses a proper qd model of the permanent magnet synchronous machine with non-sinusoidal rotor flux. The model utilizes multiple reference frame theory to properly include the back EMF harmonics as well as Commutation and conduction intervals into the averaged voltage and torque relationships. The Commutation Angle is readily obtained from the detailed simulation. The proposed model is demonstrated on a typical industrial BLDC motor with trapezoidal back EMF waveforms. The results of studies are compared with experimental measurements as well as previously established models, whereas the new model is shown to provide appreciable improvement.

  • Dynamic Average-Value Modeling of 120° VSI-Commutated Brushless DC Motors With Trapezoidal Back EMF
    IEEE Transactions on Energy Conversion, 2012
    Co-Authors: Kamran Tabarraee, Jaishankar Iyer, Hamid Atighechi, Juri Jatskevich
    Abstract:

    The 120° voltage source inverter driven brushless dc (BLDC) motors are very common in many applications. This paper extends the previous work and presents an improved dynamic average-value model for such BLDC motor-drive systems. The new model is explicit and uses a proper qd model of the permanent magnet synchronous machine with nonsinusoidal rotor flux. The model utilizes multiple reference frame theory to properly include the back EMF harmonics as well as Commutation and conduction intervals into the averaged voltage and torque relationships. The Commutation Angle is readily obtained from the detailed simulation. The proposed model is demonstrated on a typical industrial BLDC motor with trapezoidal back EMF waveforms. The results of studies are compared with experimental measurements as well as previously established models, whereas the new model is shown to provide appreciable improvement.

  • Average-value modeling of brushless DC motors with 120-degree voltage source inverter
    2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008
    Co-Authors: Nikolay Samoylenko, Juri Jatskevich
    Abstract:

    Summary form only given. This paper describes average-value modeling of brushless DC motor-inverter systems, which is challenging due to the complicated switching patterns of the stator currents. A new average-value model which appropriately includes Commutation and conduction subintervals of the brushless DC motor with a 120-degree inverter is presented. The proposed model is explicit and uses a proper qd model of the permanent magnet synchronous machine. The required Commutation Angle is represented as a nonlinear algebraic function, which is readily obtained from the detailed simulation. The studies conducted are based on two typical industrial motors with different electrical time constants, and include hardware measurements, detailed simulation, and comparison with a previously published average-value model. The proposed model is shown to be more accurate in terms of both large and small signal analysis and is applicable to both types of motors.

  • Average-Value Modeling of Brushless DC Motors With 120° Voltage Source Inverter
    IEEE Transactions on Energy Conversion, 2008
    Co-Authors: Nikolay Samoylenko, Juri Jatskevich
    Abstract:

    This paper describes average-value modeling of brushless dc (BLDC) motor-inverter systems, which is challenging due to the complicated switching patterns of the stator currents. A new average-value model (AVM) that appropriately includes Commutation and conduction subintervals of the BLDC motor with a 120deg inverter is presented. The proposed model is explicit and uses a proper qd model of the permanent magnet synchronous machine. The required Commutation Angle is represented as a nonlinear algebraic function, which is readily obtained from the detailed simulation. The studies conducted are based on two typical industrial motors with different electrical time constants, and include hardware measurements, detailed simulation, and comparison with a previously published AVM. The proposed model is shown to be more accurate in terms of both large and small-signal analysis and is applicable to both types of motors.

  • Effect of stator resistance on average-value modeling of BLDC motor 120- degree inverter systems
    2007 International Conference on Electrical Machines and Systems (ICEMS), 2007
    Co-Authors: Hee-sang Ko, Juri Jatskevich
    Abstract:

    For analysis and design of electromechanical systems with brushless dc motor drives, average-value modeling is often required. Many commonly used low-cost brushless dc motors operate with 120-degree inverter. The average-value modeling of such systems often ignores the Commutation current and considers only the conduction interval. This paper uses a typical industrial BLDC machine to analyze the effect of stator resistance on the accuracy of a commonly used average-value model. It is shown that the model becomes less accurate for the motors with small stator resistance and significant Commutation Angle. However, reducing the electrical time constant of the stator winding increases the model accuracy in both time- and frequency-domains.

Kamran Tabarraee - One of the best experts on this subject based on the ideXlab platform.

  • Dynamic average-value modeling of 120° VSI-commutated brushless dc motors with trapezoidal back EMF
    2013 IEEE Power & Energy Society General Meeting, 2013
    Co-Authors: Kamran Tabarraee, Juri Jatskevich
    Abstract:

    Summary form only given. The 120° voltage source inverter (VSI) driven brushless dc (BLDC) motors are very common in many applications. This paper extends the previous work and presents an improved dynamic average-value model (AVM) for such BLDC motor-drive systems. The new model is explicit and uses a proper qd model of the permanent magnet synchronous machine with non-sinusoidal rotor flux. The model utilizes multiple reference frame theory to properly include the back EMF harmonics as well as Commutation and conduction intervals into the averaged voltage and torque relationships. The Commutation Angle is readily obtained from the detailed simulation. The proposed model is demonstrated on a typical industrial BLDC motor with trapezoidal back EMF waveforms. The results of studies are compared with experimental measurements as well as previously established models, whereas the new model is shown to provide appreciable improvement.

  • Dynamic Average-Value Modeling of 120° VSI-Commutated Brushless DC Motors With Trapezoidal Back EMF
    IEEE Transactions on Energy Conversion, 2012
    Co-Authors: Kamran Tabarraee, Jaishankar Iyer, Hamid Atighechi, Juri Jatskevich
    Abstract:

    The 120° voltage source inverter driven brushless dc (BLDC) motors are very common in many applications. This paper extends the previous work and presents an improved dynamic average-value model for such BLDC motor-drive systems. The new model is explicit and uses a proper qd model of the permanent magnet synchronous machine with nonsinusoidal rotor flux. The model utilizes multiple reference frame theory to properly include the back EMF harmonics as well as Commutation and conduction intervals into the averaged voltage and torque relationships. The Commutation Angle is readily obtained from the detailed simulation. The proposed model is demonstrated on a typical industrial BLDC motor with trapezoidal back EMF waveforms. The results of studies are compared with experimental measurements as well as previously established models, whereas the new model is shown to provide appreciable improvement.

P. Armijo - One of the best experts on this subject based on the ideXlab platform.

  • Harmonic reduction in adjustable-speed synchronous motors
    2002 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.02CH37309), 2002
    Co-Authors: M. Villablanca, C. Cuevas, W. Ziehlmann, C. Flores, P. Armijo
    Abstract:

    Summary form only given, as follows. Adjustable-speed synchronous motors (ASSM) are very popular in high-power high-speed applications. The Chilean mining industry uses them in milling operations in ranges of several thousands hp. Although a high pulse number for the inverter would be beneficial, it never goes beyond 12, due to complicated connections. Thus, a distorted harmonic-rich current feeds the synchronous motor, increasing the inverter Commutation Angle and causing additional rotor-heating and pulsating electric torque. Harmonic suppression by filters is not viable due to the variable frequency nature of the motor. In this paper a new design for the inverter, without complicated circuitry, is proposed, so that it works with 36 pulses and then the motor is fed with a highly sinusoidal current. Also, the same technique is applied to the rectifier end, so that an effective harmonic reduction is carried out at both ends of the system, i.e., the motor as well as the AC supply system. A 20-kVA laboratory development drive system has been built and experimental waveforms for the conventional (12-pulse) and proposed (36-pulse) configurations are included.

  • Harmonic reduction in adjustable-speed synchronous motors
    IEEE Transactions on Energy Conversion, 2001
    Co-Authors: M. Villablanca, C. Cuevas, W. Ziehlmann, C. Flores, P. Armijo
    Abstract:

    Adjustable-speed synchronous motors (ASSM) are very popular in high-power high-speed applications. The Chilean mining industry uses them in milling operations in ranges of several thousands hp. Although a high pulse number for the inverter would be beneficial, it never goes beyond 12, due to complicated connections. Thus, a distorted harmonic-rich current feeds the synchronous motor, increasing the inverter Commutation Angle and causing additional rotor-heating and pulsating electric torque. Harmonic suppression by filters is not viable due to the variable frequency nature of the motor. In this paper, a new design for the inverter, without complicated circuitry, is proposed, so that it works with 36 pulses and then the motor is fed with a highly sinusoidal current. Also, the same technique is applied to the rectifier end, so that an effective harmonic reduction is carried out at both ends of the system, i.e., the motor as well as the AC supply system. A 20 kVA laboratory development drive system has been built and experimental waveforms for the conventional (12-pulse) and proposed (36-pulse) configurations are included.

  • Harmonic Reduction in Adjustable-Speed Synchronous Motors
    IEEE Power Engineering Review, 2001
    Co-Authors: M. Villablanca, C. Cuevas, W. Ziehlmann, C. Flores, P. Armijo
    Abstract:

    Adjustable-speed synchronous motors (ASSM) are very popular in high-power high-speed applications. The Chilean mining industry uses ASSM in milling operations in ranges of several thousands hp. Although a high pulse number for the inverter would be beneficial, it never goes beyond 12, due to complicated connections. Thus, a distorted harmonic-rich current feeds the synchronous motor, increasing the inverter Commutation Angle and causing additional rotor-heating and pulsating electric torque. Harmonic suppression by filters is not viable due to the variable frequency nature of the motor. In this paper a new design for the inverter, without complicated circuitry, is proposed, so that it works with 36 pulses and then the motor is fed with a highly sinusoidal current. Also, the same technique is applied to the rectifier end so that an effective harmonic reduction is carried out at both ends of the system, i.e., the motor as well as the ac supply system. A 20-kVA laboratory development drive system has been built and experimental waveforms for the conventional (12-pulse) and proposed (36-pulse) configurations are included.

H A Toliyat - One of the best experts on this subject based on the ideXlab platform.

  • A hybrid solution for load-commutated-inverter-fed induction motor drives
    IEEE Transactions on Industry Applications, 2005
    Co-Authors: Sangshin Kwak, H A Toliyat
    Abstract:

    A novel, hybrid solution employing a combination of a load-commutated inverter (LCI) and a voltage-source inverter (VSI) is proposed for induction motor drives. By avoiding the use of output capacitors and a forced dc-Commutation circuit, this solution can eliminate all disadvantages related with these circuits in the conventional LCI-based induction motor drives. In addition, improved quality of output current waveforms and faster dynamic response can be achieved. The proposed hybrid scheme features the following tasks: 1) the safe Commutation Angle for the LCI, controlled by the VSI in the entire speed region of the induction motor and 2) a dc-link current control loop to ensure minimum VSI rating. Advantages of the proposed solution over the conventional LCI-based induction motor drives include the following: 1) sinusoidal motor phase current and voltage based on the instantaneous motor speed control; 2) fast dynamic response by the VSI operation; and 3) elimination of motor circuit resonance and motor torque pulsation. The feasibility of the proposed hybrid circuit for the high-power drive system is verified by computer simulation for a 500-hp induction motor. Experimental results to support the use of the proposed system are also included for a 1-hp induction motor laboratory setup.

  • A hybrid converter system for high-performance large induction motor drives
    IEEE Transactions on Energy Conversion, 2005
    Co-Authors: Sangshin Kwak, H A Toliyat
    Abstract:

    A hybrid converter system employing a combination of a load-commutated inverter (LCI), a dc-dc buck converter, and a voltage-source inverter (VSI) is proposed for the large induction motor drives. The VSI ensures the safe Commutation of the LCI with active Commutation Angle control over all speed regions. By replacing capacitor banks and a forced dc-Commutation circuit, this system can eliminate all drawbacks related to these circuits in the conventional LCI-based induction motor drives. Sinusoidal motor current and voltage waveforms are achieved with the VSI providing the reactive and harmonic power to the motor, resulting in high-performance drives. The buck converter enables both the VSI and the LCI to be fed from the single-diode rectifier. As a result, the dc-link inductor size can be reduced and the LCI is operated without the controlled rectifier. In addition, faster dynamic response can be obtained through the VSI and the buck converter operation. Finally, the buck converter performs the dc-link current control to ensure minimum VSI rating. The feasibility of the proposed hybrid circuit for the high-power drive systems is verified by computer simulation for a 500-hp induction motor. Experimental results are also included for a 1-hp induction motor laboratory setup controlled by the proposed hybrid system.

  • a hybrid converter system for high performance large induction motor drives
    Applied Power Electronics Conference, 2004
    Co-Authors: Sangshin Kwak, H A Toliyat
    Abstract:

    A novel, hybrid converter system employing combination of a load-commutated inverter (LCI), a DC-DC buck converter, and a voltage-source inverter is proposed for the large induction motor drives. By avoiding the use of output capacitors and a forced deCommutation circuit, this system can eliminate all disadvantages related to these circuits in the conventional LCI based induction motor drives. Improved quality of output current waveforms and faster dynamic response can be achieved. In addition, the use of the buck converter enables reduction of the delink inductor size and eliminating requirement for the controlled rectifier. The proposed hybrid scheme features the following tasks: 1) safe Commutation Angle for the LCI controlled by the voltage source inverter over all speed regions, and 2) a delink current control loop to ensure minimum voltage source inverter rating. Advantages of the proposed solution over the conventional LCI-based induction motor include the followings: 1) sinusoidal motor phase current and voltage based en the instantaneous motor speed control; 2) fast dynamic response through the operation of voltage source inverter and buck converter; 3) elimination of motor circuit resonance and motor torque pulsation; 4) compact and simple system implementation due to small size of the delink inductor. The feasibility of the proposed hybrid circuit for the high power drive system is verified by computer simulation for a 500 hp induction motor. Experimental results to support the use of the proposed system are also included for a 1 hp induction motor laboratory setup.

  • a novel hybrid solution for load commutated inverter fed induction motor drives
    IEEE Industry Applications Society Annual Meeting, 2003
    Co-Authors: Sangshin Kwak, H A Toliyat
    Abstract:

    A novel, hybrid solution employing a combination of a load-commutated inverter and a voltage-source inverter is proposed for the induction motor drives. By avoiding the use of output capacitors and a forced DC-Commutation circuit, this solution can eliminate all disadvantages related with these circuits in the conventional load commutated inverter based induction motor drives. In addition, improved quality of output current waveforms and faster dynamic response can be achieved. The proposed hybrid scheme features the following tasks: (1) the safe Commutation Angle for the load commutated inverter, controlled by the voltage source inverter in all speed region of the induction motor and (2) a DC-link current control loop to ensure minimum voltage source inverter rating. Advantages of the proposed solution over the conventional load commutated inverter based induction motor include the followings: (1) sinusoidal motor phase current and voltage based on the instantaneous motor speed control; (2) fast dynamic response by the voltage source inverter operation; (3) elimination of motor circuit resonance and motor torque pulsation. The feasibility of the proposed hybrid circuit for the high power drive system is verified by computer simulation for a 500 hp induction motor. Experimental results are also under way in our laboratory to show the validity of the proposed technique.

M. Jagiela - One of the best experts on this subject based on the ideXlab platform.

  • Analysis of torque developed in axial flux, single-phase brushless DC motor with salient-pole stator
    IEEE Transactions on Energy Conversion, 2004
    Co-Authors: E.a. Mendrela, M. Jagiela
    Abstract:

    An analysis of the torque developed by a single-phase disc brushless permanent magnet motor with salient-pole stator is presented. The machine represents a new family of brushless disc motors with the starting torque issue appearing to be most challenging. To produce a starting torque, the permanent magnets on one of the rotor discs are distributed nonuniformly. However, this significantly distorts a shape of the cogging torque versus rotational Angle characteristic which, in turn, affects a waveform of the overall torque. A three-dimensional (3-D) finite-element model is used for the purpose of determining of angular variations of the torque developed by the motor. To find how the torque varies with time, a model of the source-inverter-motor circuit is developed. A simulation study on an influence of the Commutation Angle on the electromagnetic torque is also a subject of this paper. The results obtained show that the motor performance can be improved by a proper selection of the current Commutation Angle to reach the maximum efficiency. The simulation results are in good agreement with measurements obtained from a prototype motor.