Modeling and Position-Sensorless Control of a Dual-Airgap Axial Flux Permanent Magnet Machine for Flywheel Energy Storage Systems

Abstract

This paper presents the modeling and position-sensorless vector control of a dual-airgap axial flux permanent magnet (AFPM) machine optimized for use in flywheel energy storage system (FESS) applications. The proposed AFPM machine has two sets of three-phase stator windings but requires only a single power converter to control both the electromagnetic torque and the axial levitation force. The proper controllability of the latter is crucial as it can be utilized to minimize the vertical bearing stress to improve the efficiency of the FESS. The method for controlling both the speed and axial displacement of the machine is discussed. An inherent speed sensorless observer is also proposed for speed estimation. The proposed observer eliminates the rotary encoder, which in turn reduces the overall weight and cost of the system while improving its reliability. The effectiveness of the proposed control scheme has been verified by simulations and experiments on a prototype machine. Keywords

Torque Control of an In-Wheel Axial Flux Permanent Magnet Synchronous Motor using a Fuzzy Logic Controller for Electric Vehicles

“…These controllers are designed using linear and nonlinear control methods such as PI, LQR, dead beat, sliding mode, flatness, fuzzy [10][11][12][13][14], or hybrid controllers such as fuzzy-neural, fuzzy-sliding, and PIfuzzy [14][15][16][17]. However, the torque response has a slight pulsation, and the actual speed response quickly and accurately tracks the required speed [17][18][19][20]. Therefore, the study of intelligent control solutions to improve an integrated in-wheel AFPMSM torque in an EV should be combined with the required components and physical properties, such as brake and accelerator pedals, road inclination, and wind resistance.…”

Improved Torque Control for In-Wheel AFPMSM Drives Using Fuzzy Logic and Neuro-Fuzzy Controller

“…This research results only stop to evaluate the effectiveness of each solution for torque and speed control in the case of AFPMSM motors operating with unchanged load torque or motor parameters. However, the torque response has a slight pulsation, and the actual speed response quickly and accurately tracks the required speed [18][19][20]. Thereby, it is found that researching intelligent control solutions to improve an AFPMSM motor torque integrated with electric car inwheel, combined with the required torque component by the physical properties of the vehicle car.…”

Wide Air-gap Control for Multi-module Permanent Magnet Linear Synchronous Motors without Magnetic Levitation Windings

“…It has advantages in terrms of reducing several problems such as large, heavy, and complex conventional structures for air-gap control [10], [11]. In addition, this paper focuses on the continuous air-gap and position controls in the special structures of the developed MM-PMLSM [4], [12]- [14].…”