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The flux weakening control is significant for the interior permanent magnet synchronous motor to obtain a wide constant power range which is required in the electric vehicle application. A representative flux weakening method is to design an outer voltage loop using the voltage reference and the voltage limit. If the characteristic current of the motor is less than the current limit, the deep flux...
Direct-drive in-wheel motors have become an extremely attractive option for electric vehicles. Two kinds of motors are devised, Permanent Magnet Synchronous Motor (PMSM) and Permanent-Magnet Flux-Modulated Motor (PMFM), respectively. Keeping the same back EMF, current density and copper loss, this paper analyzes and compares torque density, torque ripple, flux-weakening performance, speed range, loss...
Two outer rotor PMSMs with different rotor topologies, surface-mounted permanent magnet (SPM) rotor and consequent-pole (CP) rotor are designed for in-wheel direct drive. A comparative study is presented on the characteristics of the two motors under two typical short-circuit faults, three-phase symmetrical short-circuit (SSC) fault and single-phase asymmetrical short-circuit (ASC) fault. The fault...
Thermal management is the core technology of a modern motor with high efficiency, high power density and high reliability. This paper presents a set of models and an experiment platform for the analysis of wind fields and temperature fields in a high power permanent magnet motor with a closed heat dissipation structure. The three-dimensional temperature field and flow field were estimated by simulation...
This paper proposes a novel rotor structure for high-speed interior permanent magnet motors to overcome huge centrifugal forces under high-speed operation. Instead of the conventional axial stacking of silicon-steel laminations, the retaining shield rotor is inter-stacked by high-strength stainless-steel plates to enhance the rotor strength against the huge centrifugal force. Both mechanical characteristics...
In this paper thermal behavior of a 600kW 4200r/min interior permanent magnet synchronous motor (PMSM) with forced ventilation in the stator was analyzed using Fluent. Due to its high power density and compact structure, accurate thermal analysis of PMSM traction machine is of great importance in designing and optimizing. Different structures of stator ventilation are evaluated and the square ventilation...
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