Abstract
This paper investigated an electromagnetic torque ripple level of BLDC drives with multiple three-phase (TP) permanent magnet (PM) motors for electric vehicles. For this purpose, mathematical models of PM machines of different armature winding sets-single (STP), dual (DTP), triple (TTP), and quadruple (QTP) ones of asymmetrical configuration and optimal angular displacement between winding sets were developed and corresponding computer models in the Matlab/Simulink environment were created. In conducted simulation, the influence of various factors on the electromagnetic torque ripple of the multiple-TP BLDC drives was investigated—degree of modularity, magnetic coupling between armature winding sets, and drive operation in open and closed-loop control systems. Studies have shown an increase of the electromagnetic torque ripple generated by one module in the multiple TP BLDC drives with magnetically coupled winding sets, due to additional current pulsations caused by magnetic interactions between the machine modules. However, the total electromagnetic torque ripples are much lower than in similar drives with magnetically insulated winding sets. Compared with the STP BLDC drive, the multiple TP BLDC drives with the same output parameters showed a reduction of the electromagnetic torque ripple by 27.6% for the DTP, 32.3% for the TTP, and 34.0% for the QTP BLDC drive.
Highlights
To significantly simplify the modular multiple TP drive, we propose to use a modular brushless DC motor (BLDCM) with permanent magnets (PM) [19]
The first series shows a variant with magnetically uncoupled sets of the armature windings of multiple TP PM machine, and the second series demonstrates a variant with magnetically coupled ones
The BLDCM accelerated to the set rated angular velocity of 20 rad/s, and at a time of 0.13 s, an additional load torque was suddenly applied to the shaft that increased the total load torque to the rated value
Summary
A number of new qualities characterize EVs, such as much higher efficiency, simplified design, especially of the mechanical transmission, increased automation of all subsystems, improved handling, stability and safety, increased reliability, and reduced need for maintenance of all subsystems [1]. All these positive qualities of EVs can be enhanced through new approaches to configuring their main subsystems and applying appropriate control principles. One of the most productive of these approaches, in our view, is a modular approach in the design of powertrain subsystems—on-board power systems, electrical machines, and power semiconductor converters, which combine individual modules and control power flows [2,3,4,5]
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