Abstract
An axial flux permanent magnet single-rotor generator has good potential in various applications that require high efficiency, prolonged service life, as well as low mass and dimensions. However, the effect of cogging torque diminishes generator efficiency and flexibility of functionality. The effect of cogging torque arises because of a small air gap between the stator teeth and the rotor. In this article, we suggest that shifting the opposite teeth of the stator to the optimal angle can reduce the effect of cogging torque. A special axial flux permanent magnet generator is developed to choose the optimal disposition of the permanent magnet and stator teeth in the frame. The impact of the optimal angle on the cogging torque, output power, and generator efficiency is investigated. This analytical study with experimental testing proves that the optimal angle between opposite teeth can significantly decrease cogging torque and improve output power and efficiency. The results show that cogging torque decreases significantly (4–5 times) at an optimal angle of 7.5° as compared with that of other angles, although magnetic flux and output power decline slightly but efficiency increases.
Highlights
A single rotor includes half of the permanent magnets (PMs) segments as compared with a double-rotor frame; this circumstance decreases the cost of the machine, since the PMs determine a significant portion of the expenses
Cogging torque and the performance of the generator were measured at different an4
This study investigated investigated cogging coggingtorque torquereduction reductionininAFPM
Summary
The stator cores were made using cold-rolled grain-oriented silicon steel that was insulated with a special heat resistant coating. Each stator tooth is insulated with high temperature anti-static tape and wrapped with 70 turns of copper wire with a diameter of 0.5 mm. This appliance is a 12-pole machine configuration due to voltage inducing and cogging torque reduction considerations. The PM materials were chosen based on the following merits: Micromachines 2021, 12, x is a 12-pole machine configuration due to voltage inducing and cogging torque reduction considerations. Internal design axial flux permanent magnet (AFPM); AFPM generator yoke; Relative angle between. Mechanical, and electrical) of proposed generator are shown and electrical) the proposed generator shown in
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