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Armature Inductance
The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform
John Chiasson – 1st expert on this subject based on the ideXlab platform
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Nonlinear Differential-Geometric Techniques for Control of a Series DC Motor
IEEE Transactions on Control Systems Technology, 1994Co-Authors: John ChiassonAbstract:The problem of controlling a series DC motor using only current measurements is considered. It is shown that both speed and load-torque may be estimated from the current measurements. Two nonlinear feedback laws are considered based on feedback linearization and input-output linearization, respectively. Both of these control laws require knowledge of the speed and load-torque. The speed/torque estimation scheme and the control schemes are valid in the presence of magnetic saturation in the field circuit and when high-speed field-weakening is employed. By neglecting the Armature Inductance, the estimation is accomplished using nonlinear state-space and output-space transformations to construct an observer with linear error-dynamics whose rate of convergence may be arbitrarily specified. (Such an observer could provide reliability to existing systems in the event of a speed sensor failure.) The feedback-linearization controller involves a nontrivial state-space transformation allowing control of the full state trajectory. An input-output linearization controller with stable internal dynamics is also explicitly constructed. Finally, simulations are given to demonstrate the algorithms
Ming-yang Cheng – 2nd expert on this subject based on the ideXlab platform
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A Cost Effective Sensorless Control Method for Permanent Magnet Synchronous Motors Based on Average Terminal Voltage
2006 5th International Power Electronics and Motion Control Conference, 2006Co-Authors: Cheng-hu Chen, Ming-yang ChengAbstract:This paper presents the design, analysis, and implementation of a high performance and cost effective sensorless control scheme for the extensively used Brushless DC Motors (BLDCM), Permanent Magnet Synchronous Motors (PMSM), and Interior Permanent Magnet Synchronous Motors (IPMSM). In the proposed approach, instead of sensing the non-excited back EMF or injecting the additional high frequency switching signals, the commutation signals are extracted directly from the specific average line to line voltages with simple RC circuits and comparators. As a result, the proposed approach is particularly suitable for rectangular current commutation. For the case of sinusoidal commutation, which is desired for PMSMs and IPMSMs, the required continuous position can be obtained from the speed information which is calculated and updated every 60 electric degrees. Moreover, the speed-dependent commutation error caused by the low pass filter and inherent Armature Inductance is analyzed. An optimal commutation strategy is proposed to keep the Armature current as small as possible. Compared with the conventional methods, complex calculation and sensitive machine parameters are not required in the proposed approach. Because of the inherent low cost property, the proposed control algorithm is particularly suitable for air purifiers, air blowers, cooling fans, air conditioners, and related home appliances, etc. Theoretical analysis and various experiments have been conducted to evaluate the effectiveness of the proposed method.
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A Cost Effective Sensorless Control Method for Permanent Magnet Synchronous Motors Based on Average Terminal Voltage
2006 CES IEEE 5th International Power Electronics and Motion Control Conference, 2006Co-Authors: Cheng-hu Chen, Ming-yang ChengAbstract:This paper presents the design, analysis, and implementation of a high performance and cost effective sensorless control scheme for the extensively used brushless DC motors (BLDCM), permanent magnet synchronous motors (PMSM), and interior permanent magnet synchronous motors (IPMSM). In the proposed approach, instead of sensing the non-excited back emf or injecting the additional high frequency switching signals, the commutation signals are extracted directly from the specific average line to line voltages with simple RC circuits and comparators. As a result, the proposed approach is particularly suitable for rectangular current commutation. For the case of sinusoidal commutation, which is desired for PMSMs and IPMSMs, the required continuous position can be obtained from the speed information which is calculated and updated every 60 electric degrees. Moreover, the speed-dependent commutation error caused by the low pass filter and inherent Armature Inductance is analyzed. An optimal commutation strategy is proposed to keep the Armature current as small as possible. Compared with the conventional methods, complex calculation and sensitive machine parameters are not required in the proposed approach. Because of the inherent low cost property, the proposed control algorithm is particularly suitable for air purifiers, air blowers, cooling fans, air conditioners, and related home appliances, etc. Theoretical analysis and various experiments have been conducted to evaluate the effectiveness of the proposed method
W. Oghanna – 3rd expert on this subject based on the ideXlab platform
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Simulator of DC traction motors including both main pole and interpole saturation
IEE Proceedings – Electric Power Applications, 1998Co-Authors: J. Zhang, R. Mathew, F. Flinders, W. OghannaAbstract:The paper presents a two-dimensional saturation model for DC traction motors. Two look-up tables are employed, which are the measured saturation curves for main poles and interpoles, respectively. Besides the saturation caused by field currents, an algorithm is derived to account for the flux weakening caused by Armature reaction. The effects of saturation on all Inductance parameters are presented, and variations of the Armature Inductance with both main pole saturation and interpole saturation are modelled. A Simulink motor model is presented to implement the above features in simulation, and is used as a visualisation simulator for DC traction motors. The simulation results from this simulator have been confirmed by comparisons with measurements.
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Analysis of two-dimension saturation for simulation in DC traction motors
Proceedings of International Conference on Power Electronics Drives and Energy Systems for Industrial Growth, 1996Co-Authors: J. Zhang, R. Mathew, W. OghannaAbstract:The paper presents a two-dimensional saturation model for DC traction motors. Two look-up tables are employed, which are the measured saturation curves for the main poles and interpoles respectively. Besides the saturation caused by field currents, an algorithm is derived to account for the flux weakening caused by Armature reaction. The effects of saturation on all Inductance parameters are presented, and variations of the Armature Inductance with both main pole saturation and interpole saturation are modelled. A Simulink motor model is presented to implement the above features in simulation, and is used as a visualisation simulator for DC traction motors. This model has been saved as a Simulink library for further applications in investigating commutation process of DC traction motors.