Abstract
This paper proposes a novel layered permanent magnet motor (N-LPM), which is based on a three-degree-of-freedom (3-DOF) permanent magnet motor. Compared with the former, the improved N-LPM air gap magnetic density, torque and structure stability have been significantly improved. The proposed N-LPM has three layers of stator along the axis direction, and each layer of stator has three-phase winding. In order to calculate the magnetic field and torque distribution of the N-LPM, an analytical method (AM) is proposed. For performance verification and accurate calculation, finite-element analysis (FEA) is adopted. The two kinds of motors before and after the improvement are compared, and their magnetic field, torque and stability are analyzed. The optimization rate is defined to evaluate the performance of the motor before and after improvement. The results show that the radial flux density, rotation torque, deflection torque and the volume optimization rate of the permanent magnet of the improved motor are 80%, 25%, 50% and 54.72% respectively, and the comprehensive performance is improved significantly.
Highlights
The traditional multi-degree-of-freedom motor is composed of a large number of traditional motors and corresponding mechanical links, but the combination of these structures is complex and cumbersome, and difficult to maintain, so it is difficult to apply them to fine motion occasions [1,2]
The multi-degree-of-freedom motor model with coil excitation is cheaper, the introduction of an excitation mechanism will lead to a larger overall model of the motor, which is difficult to be used in small applications such as robot joints [5,6]
The new layered permanent magnet motor (N-LPM) has the advantages of small volume, high slot utilization, high magnetic density amplitude and mechanism stability, which make up for the shortcomings of the existing multi-degree-of-freedom motor
Summary
The traditional multi-degree-of-freedom (multi-DOF) motor is composed of a large number of traditional motors and corresponding mechanical links, but the combination of these structures is complex and cumbersome, and difficult to maintain, so it is difficult to apply them to fine motion occasions [1,2]. Partial permanent magnet multi-degree-of-freedom motors have very low slot utilization rates This will affect the magnetic density distribution and structural stability of the motor, and make the temperature of some stator coils rise very high. In view of the disadvantages of the existing multi-degree-of-freedom motor, such as high cost, low air gap magnetic density and unstable structure and slot utilization, a novel new layered permanent magnet motor (N-LPM) is proposed based on the Energies 2020, 13, 2533; doi:10.3390/en13102533 www.mdpi.com/journal/energies. The N-LPM has the advantages of small volume, high slot utilization, high magnetic density amplitude and mechanism stability, which make up for the shortcomings of the existing multi-degree-of-freedom motor. The N-LPM has the characteristics of low flux leakage and high torque, which is difficult to achieve in the existing multi-degree-of-freedom motor. The results show that the magnetic field performance and torque characteristics of the new structure are effectively improved, and the magnetic flux leakage is obviously suppressed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
