Selected Aspects of Decreasing Weight of Motor Dedicated to Wheel Hub Assembly by Increasing Number of Magnetic Poles

Abstract

Decreasing the mass of a wheel hub motor by improving the design of a motor’s electromagnetic circuit is discussed in this paper. The authors propose to increase the number of magnetic pole pairs. They present possibilities of mass reduction obtained by these means. They also analyze the impact of design changes on losses and temperature distribution in motor elements. Lab tests of a constructed prototype, as well as elaborated conjugate thermal-electromagnetic models of the prototype motor and modified motor (i.e., motor with increased number of magnetic poles) were used in the investigation. Simulation models were verified by tests on the prototype. Results of calculations for two motors, differing by the number of pair poles, were compared over a wide operational range specific to the motor application in the electric traction. A detailed analysis of the operational range for these motors was also made.

Study on the Selection of the Number of Magnetic Poles and the Slot-Pole Combinations in Fractional Slot PMSM Motor with a High Power Density

“…On the other hand, an increase in the number of poles makes it possible to reduce the cross sections of the elements of the electromagnetic circuit, and thus reduce the mass of the motor. The analyzed issues are important for high power density motor, because they affect the mass of the motor, the value of the shaft torque, as well as the value of rotor losses (rotor yoke and permanent magnets) [9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Studies on Energy Consumption of Electric Light Commercial Vehicle Powered by In-Wheel Drive Modules

“…Among the designs of electric drive systems, those with electric motors located directly in the wheel are evolving rapidly. The vast majority of these designs use synchronous motors with permanent magnets, such as outrunner radial flux [33][34][35][36][37][38][39][40], axial flux [41][42][43][44][45][46][47][48], reluctance [49,50] or induction [51,52]. There are also constructions that, in order to reduce exhaust emissions generated by heat engines, use drive modules that can be added to an existing internal combustion vehicle by replacing parts of the suspension components [53,54] or the entire axle [55].…”

Design and Application of Electrical Machines

“…The paper by Dukalski and Krok [12] discusses the problem of decreasing the mass of a wheel hub motor by improving the design of a motor's electromagnetic circuit. The authors propose increasing the number of magnetic pole pairs.…”