Topological optimization of the rotors of permanent magnet synchronous motors

Alfred Safin,Timur Petrov,A Fedyukhin,S Dixit

doi:10.1051/e3sconf/202022001040

Abstract

Permanent magnet synchronous motors are increasingly used in the oil industry. These motors need to be made more energy efficient. To do this, it is necessary to optimize the rotor of a synchronous motor by changing the design through topological optimization. Designing an electrical machine as a heuristic process does not guarantee finding the best solution. Methods are needed that complement the experience and intuition of the designer to find the optimal (rational) solution. Topological optimization is currently performed using the finite element method to reduce mass and improve the stiffness of structures. The proposed method allows you to transfer topological optimization to electromagnetic processes in permanent magnet synchronous motors to determine the direction of magnetization and the size of permanent magnets, for a given mass-dimensional parameters. Optimization of the rotor of a serial permanent magnet motor based on a genetic algorithm is proposed. A new topology of the rotor of the motor was calculated and an increase in the torque was obtained by 18.2%, which indicates that topological optimization is promising for synchronous motors with permanent magnets.

Highlights

Permanent magnet synchronous motors (PMSM) as part of a sucker rod pumping unit during oil production are distinguished by the fact that instead of an excitation winding on the rotor, they have permanent magnets that create an exciting magnetic flux
The stator of permanent magnet synchronous machines is similar to the stator of an induction motor (IM) and has a three-phase winding [6]
The energy, weight, size and dynamic performance of a permanent magnet synchronous machine depends on the properties and topology of the materials used in the manufacture of the rotor [1,2,5]

Summary

Introduction

Permanent magnet synchronous motors (PMSM) as part of a sucker rod pumping unit during oil production are distinguished by the fact that instead of an excitation winding on the rotor, they have permanent magnets that create an exciting magnetic flux. Permanent magnets in a synchronous machine are used to create a constant magnetic flux. The energy, weight, size and dynamic performance of a permanent magnet synchronous machine depends on the properties and topology of the materials used in the manufacture of the rotor [1,2,5]. The main advantage of the collector design of the rotor magnetic system is the maximum use of the energy of the magnets. The collector design allows for a higher magnetic flux density in the air gap than in a radial magnetic system [3,4]. The task is to achieve more torque due to topological optimization of the rotor of a synchronous motor

Initial data

Calculation algorithm

Findings

Conclusion