A Study on the Improvement of Torque Density of an Axial Slot-Less Flux Permanent Magnet Synchronous Motor for Collaborative Robot

Abstract

In this paper, an axial slot-less permanent magnet synchronous motor (ASFPMSM) was designed to increase the power density. The iron core of the stator was replaced with block coils, and the stator back yoke was removed because 3D printing can provide a wide range of structures of the stator. The proposed model also significantly impacts efficiency because it can reduce iron loss. To meet size and performance requirements, coil thickness and number of winding layers in the block, the total amount of magnet, and pole/slot combinations were considered. The validity of the proposed model was proved via finite elements analysis (FEA).

A Study on Optimal Design Process of Dual Rotor Axial-Flux Permanent Magnet Synchronous Motors

“…It will grow at an average annual rate of 32% by 2025. It is projected to grow to $17.2 billion by 2025 [1][2][3][4][5].…”

“…The torque of the AFPM motor is proportional to the cube of the motor diameter, as shown in Equation (2). As the AFPM motor can increase the permanent magnet usage at the same volume, it has high torque and high efficiency characteristics compared to the RFPM motor [16][17][18][19][20].…”

Design and Analysis of Coreless Axial Flux Permanent Magnet Machine with Novel Composite Structure Coils

“…The significant loss of the coreless AFPM machine is the DC copper loss and eddy current loss in windings, of which the former is generated when the stator current flows through the conductor, and the latter is generated because the coils are directly exposed to the air magnetic field [3,14], especially when operated at a high electric frequency. A number of works have been performed in recent years [15][16][17][18][19][20], that the trapezoidal coils or optimized trapezoidal coils are mostly used in the coreless stator [9,16], compared with the other special shapes such as the circular coils [10] and rhomboidal coils [15], to improve the winding factor The number of turns and width of the conductor can be synchronously optimized, and the structure of unequal width winding is proposed and applied in [16]. The coreless AFPM machine with a type of block coil using 3D printing technology is applied in the collaborative robot to achieve higher output power and efficiency [17].…”

“…A number of works have been performed in recent years [15][16][17][18][19][20], that the trapezoidal coils or optimized trapezoidal coils are mostly used in the coreless stator [9,16], compared with the other special shapes such as the circular coils [10] and rhomboidal coils [15], to improve the winding factor The number of turns and width of the conductor can be synchronously optimized, and the structure of unequal width winding is proposed and applied in [16]. The coreless AFPM machine with a type of block coil using 3D printing technology is applied in the collaborative robot to achieve higher output power and efficiency [17]. In [18], with a limited outer diameter of the stator, the length of effective conductors is increased by the improved ends of windings, resulting in the space utilization of the coreless stator and the efficiency of the machine can be improved.…”

A Review of Axial-Flux Permanent-Magnet Motors: Topological Structures, Design, Optimization and Control Techniques

“…Axial-flux permanent-magnet (AFPM) motors are now attractive choices for various applications, such as new energy vehicles [1], aerospace [2], marine [3] and other industrial applications [4,5]. The reason is that AFPM motors have the advantages of compact structure, high torque density and high power density [6].…”