Marv Hamdan

Maximum Torque per Ampere Control for Buried Magnet PMSM Based on DC-Link Power Measurement

Maximum torque per ampere (MTPA) control scheme for buried magnet permanent magnet synchronous motor (PMSM) or internal permanent magnet (IPM) machine is presented in this paper. The proposed control scheme was developed based on measurement of only dc-link quantities eliminating the necessity of three-phase current feedback. The scheme employs an online search algorithm with initial condition computed from the a priori system information. Hybridization of a search-based algorithm with precomputed control coefficients ensures robustness against parameter variations while maintaining good dynamic performance.

Maximum torque per ampere control for interior permanent magnet motors using DC link power measurement

Maximum torque per ampere (MTPA) control scheme for internal permanent magnet (IPM) machine is presented in this paper. Proposed control scheme was developed based on measurement of only DC link quantities eliminating the necessity of 3-phase current feedback. The scheme employs an online search algorithm with initial condition computed from a-priory system information. Hybridization of search based algorithm with pre-computed control coefficients ensures robustness against parameter variations while maintaining good dynamic performance.

Comparison of axial flux machine performance with different rotor and stator configurations

Axial flux machines (AFMs) are used in applications that require high power and torque densities in a pancake-type form factor. There are various types of AFMs based on the configuration of the rotor/stator and magnet orientation. In this paper, a comprehensive analysis and comparison of AFMs with different rotor and stator configurations are presented. Considered topologies are: slotted AFMs with single stator single rotor (SSSR), double stator single rotor (DSSR) and single stator double rotors (SSDR). The effect of magnet orientations such as interior permanent magnet or surface permanent magnets is also considered. The analytical sizing equations are used as a first step then optimizations are performed through the 3D finite element analysis (FEA) to attain maximum torque density while staying within the mechanical and electrical constraints. The performances of the AFM types are compared with respect to torque density, power factor and efficiency.

Design of a novel interior permanent magnet axial flux machine

Axial flux machines (AFMs) are used in applications that require high power and torque densities in a pancake-type form factor. There are various types of AFMs based on the configuration of the rotor/stator and permanent magnet (PM) orientation. Most AFMs employ surface permanent magnet machines and as the result, the machine has low inductance and saliency. In this paper, an axial flux machine with interior V-shaped permanent magnets is proposed. The machine is designed in a double stator single rotor (DSSR) configuration to attain balanced axial forces. The interior permanent magnet (IPM) AFM has higher inductance and saliency. This enables the machine to operate in a wide speed range. Furthermore, the use of magnet and reluctance torque allows the machine to reduce the magnet usage for the same power rating. The paper presents the structure, operating principle, design considerations and a comparison with existing AFM topologies. 3D finite element analysis (FEA) models are used in the design procedure to design machines achieving the maximum torque density while staying within the mechanical and electrical constraints.

Power-line impedance modeling of tractor-trailer system

This paper focuses on the channel characterization and modeling for power line communication (PLC) inside a Tractor-Trailer system. Understanding the behavior of the power line in tractor-trailer system at PLC frequency bands is quintessential for designing the PLC system to achieve desired performance. In this paper, s-domain impedance signatures for the tractor, trailer, dolly, harness and electronic control unit (ECU) has been developed by making impedance measurements of the system under different loading scenarios. The transfer function model predicting the PLC channel impedance under the given frequency band (75 kHz–425 kHz), shows good agreement between the estimated and measured data on a tractor-trailer system test bed platform.