Related Experiment Video
Updated: Nov 10, 2025
08:59
Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
Published on: June 13, 2022
2.8K
The Effects of Cogging Torque Reduction in Axial Flux Machines
Samuel Mengesha1, Shailendra Rajput1, Simon Lineykin2
1Department of Electric and Electronic Engineering, Ariel University, Ariel 40700, Israel.
Micromachines
|April 3, 2021
Summary
Shifting stator teeth to an optimal 7.5° angle significantly reduces cogging torque in axial flux permanent magnet generators. This optimization improves generator efficiency and output power while maintaining low mass and dimensions.
Area of Science:
- Electrical Engineering
- Materials Science
Background:
- Axial flux permanent magnet (AFPM) generators offer high efficiency, long service life, and compact designs.
- Cogging torque, caused by the air gap between stator teeth and rotor, negatively impacts AFPM generator performance.
Purpose of the Study:
- To investigate the effect of optimizing stator tooth angles on reducing cogging torque in AFPM generators.
- To analyze the influence of this optimization on generator efficiency, output power, and magnetic flux.
Main Methods:
- Development of a specialized AFPM generator for optimal magnet and stator tooth placement.
- Analytical study and experimental testing to evaluate cogging torque, output power, and efficiency at various tooth angles.
Main Results:
- An optimal stator tooth angle of 7.5° was identified to significantly decrease cogging torque (4-5 times reduction).
- Slight decreases in magnetic flux and output power were observed, but generator efficiency showed improvement.
Conclusions:
- Optimizing stator tooth disposition is an effective strategy to mitigate cogging torque in AFPM generators.
- The 7.5° optimal angle presents a favorable trade-off, enhancing efficiency and reducing cogging torque with minimal impact on power output.
Related Concept Videos
01:09Transmission Shafts: Problem Solving
368
Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
Next, use bending moment diagrams for the shaft to...
368
01:13Angle of Twist: Problem Solving
530
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
530
01:21Screw: Problem Solving
532
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
To evaluate the...
532
01:13Torque On A Current Loop In A Magnetic Field
5.2K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
5.2K
01:15Design of Transmission Shafts - Stress Analysis
571
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
571
01:24Bearings: Problem Solving
383
Understanding the calculations and concepts related to double-collar bearings is essential for engineers and designers to optimize the performance of these components in various applications. By analyzing the bearing under different conditions, one can ensure that it can withstand the forces and moments experienced during operation. This knowledge enables better decision-making when designing and selecting bearings for specific purposes and configurations. Consider a double-collar bearing with...
383