Analysis of Stator Material for Eliminating Cogging Torque

• Published in: Sensors and materials 2022-01, Vol.34 (9), p.3479
• Main Authors: Huang, Ming-Jen, Lin, Chia-Hung
• Format: Article
• Language: English
• Subjects: Brushless motors; Cogging; Copper wire; Inventors; Iron oxides; Permanent magnets; Rotors; Silicon; Silicon steels; Stators; Steel plates; Subsystems; Torque; Wire winding
• ISSN: 0914-4935; 2435-0869
• DOI: 10.18494/SAM3925

Eliminating or reducing cogging torque has been the most important issue in the development of permanent magnet brushless motors. Because of the structure of the motor, the stator is traditionally made of a silicon steel plate with a copper wire winding, while the rotor silicon steel plate is clamped with a permanent magnet. Usually, when the power is off, the relative motion of the stator's silicon steel plate and the rotor's magnet produces cogging torque. This phenomenon affects the motor's smooth rotation and shortens the motor's life. In this paper, on the basis of the book Inventor-style Task-solving Theory (TRIZ) by the Soviet inventor Altshuller, we analyze the effect of the matter field on components or subsystems of interest, such as the components requiring improvement or with the lowest functional value in the system, or when a quick and simple model is required to provide a designer with a different direction of thinking. Thus, it is unnecessary to use a set tool; any tool may be helpful for generating a good idea. We propose that the silicon steel plate of the motor is replaced with nano Fe3O4 powder.