Speaker
Description
In the case of the permanent magnet electronic brake that will be discussed in this paper, a permanent magnet is placed at the bottom of the stator and a winding is placed in the middle of the stator. In the case of attractive force, it is generated by magnetic energy generated by permanent magnets, and current must be applied to the winding to cancel out the stopping force. In the case of a permanent magnet type electronic brake, the maximum stopping force that can be generated is fixed depending on the permanent magnet inserted at the bottom, and the stopping force cannot be changed even if the load conditions vary. In this paper, we studied a method for outputting a permanent magnet type electronic brake. Two methods were proposed to vary stopping power. The first method is to use an Alico 9 magnet with low coercive force and utilize the magnetization and demagnetization phenomenon according to load conditions to utilize stopping power. The second method is to secure additional stopping power by improving the stator and rotor structures to generate iron loss at the moment stopping power is needed. To verify the validity of this study, a prototype of a permanent magnet brake was manufactured and a dynamo test was conducted.
Fig. 1 a) Permanent magnet electronic brake design process. b) Attractive-force analysis using 3D FEA.
Acknowledgements
This study was supported by the Ministry of Trade, Industry, and Energy (MOTIE) and Korea Evaluation Institute of Industrial Technology (KEIT) of the Republic of Korea under Grant 20023875.
References
[1] K.-D. Lee, J. Lee, and H.-W. Lee, “Inductance Calculation of Flux Concentrating Permanent Magnet Motor through Nonlinear Magnetic Equivalent Circuit,” IEEE Transactions on Magnetics, vol. 51, no. 11. Institute of Electrical and Electronics Engineers (IEEE), pp. 1–4, Nov. 2015. doi: 10.1109/tmag.2015.2438000.
