Development of a Modular Controller to Minimize Current Ripple in Low Inductance Coreless Permanent Magnet Motor

Abstract

In this paper, a development of a modular controller to minimize current ripple in a low inductance coreless permanent magnet synchronous motor (CPMSM) is described. Based on individual modules, the controller uses a 60 degree commutation scheme instead of the conventional 120 degree. The neutral point of the motor’s windings is connected to an intermediate voltage level provided by a capacitor bank relative to the DC power bus. This feature allows the utilization of a single current sensing point that is used to regulate the motor’s torque by hysteretic current level control. With this simplification of the control strategy it was possible to use a single Programable Logic Device (PLD) to implement all the processing in the controller. The controller was built and tested, and the results showed efficient and smooth operation of the motor.


Keywords: Current ripple, Permanent magnet motor, Low inductance

References
[1] J. M. G. Rebelo and M. Â. R. Silvestre, “Development of a Coreless Permanent Magnet Synchronous Motor for a Battery Electric Shell Eco Marathon Prototype Vehicle,” pp. 1– 9, 2018.

[2] F. Caricchi, F. Crescimbini, A. Di Napoli, and M. Marcheggiani, “Prototype of electric vehicle drive with twin water-cooled wheel direct drive motors,” PESC Record - IEEE Annual Power Electronics Specialists Conference, vol. 2. pp. 1926–1932, 1996.

[3] J. O. Estima, A. J. M. Cardoso, and S. Member, “Efficiency_Analysis_of_Drive_Train_Topol,” 2012.

[4] H. C. Lovatt, V. S. Ramsden, and B. C. Mecrow, “Design of an in-wheel motor for a solar- powered electric vehicle,” IEE Proc. - Electr. Power Appl., vol. 145, no. 5, p. 402, 1998.

[5] S. W. Colton, “Design and prototyping methods for brushless motors and motor control,” Massachusetts Institute of Technology, 2010.

[6] J. Rodríguez, S. Member, J.-S. Lai, and F. Zheng Peng, “Multilevel Inverters: A Survey of Topologies, Controls, and Applications,” IEEE Trans. Ind. Electron., vol. 49, no. 4, 2002.

[7] S. J. Mesquita, F. L. M. Antunes, and S. Daher, “A new bidirectional hybrid multilevel inverter with 49- level output voltage using a single dc voltage source and reduced number of on components,” Electr. Power Syst. Res., vol. 143, pp. 703–714, Feb. 2017.

[8] A. Van Den Bossche, D. V. Bozalakov, T. Vyncke, and V. Cekov, “Programmable Logic Device Based Brushless DC Motor Control,” Power Electron. Appl. (EPE 2011), pp. 1–10, 2011.