Optimal Design and Finite Element Analysis of an Efficiency BPMDC Motor for EV Propulsion with Reduced Material Cost and Power Losses Using ANSYS Electronics

Electric vehicles are becoming a familiar sight on roads around the world, yet the heart of every electric car remains a complex machine: the electric motor. To move a vehicle, these motors must convert electricity into motion with as little waste as possible. When energy is wasted, it usually turns into heat or is lost through friction, which shortens the driving range and increases the cost of the vehicle. A specific type of motor, known as a brushless permanent magnet DC motor, has emerged as a strong contender for this job because it is compact, powerful, and efficient. However, building one is not just about making it spin; it requires a delicate balance of materials. The magnets inside the rotor, the steel in the core, and the copper in the windings all have different costs and performance traits. If the materials are too expensive, the car becomes unaffordable; if they are too weak, the motor wastes energy. The challenge for engineers is to find the perfect combination that delivers high performance without breaking the bank.

In a recent study, a team of researchers set out to solve this balancing act for a motor designed specifically for electric vehicle propulsion. They focused on a 2.08-kilowatt motor, a size suitable for smaller vehicles or specific drive applications, and used advanced computer simulations to test their ideas. Instead of building physical prototypes, which can be slow and costly, they used a powerful software suite called ANSYS Electronics. This tool allowed them to create a detailed digital model of the motor and watch how electricity and magnetic fields interacted inside it. The researchers designed the motor to run on 220 volts at a speed of 1500 revolutions per minute. They carefully selected the steel for the stator and rotor cores and arranged the copper windings in a specific pattern to ensure the magnetic forces were distributed evenly. The goal was to see how different choices in the permanent magnets—the pieces that provide the constant magnetic field inside the motor—would change the motor's efficiency and the amount of energy it wasted.

To find the best solution, the team did not just test one type of magnet. They created six different versions of the motor, each using a different grade of permanent magnet material. They then ran the same simulation on all six versions to see which one performed best under the same conditions. The computer calculated every detail, from how much heat the copper wires generated to how much energy was lost as the motor parts rubbed against the air. The results were clear: not all magnets were created equal. One specific magnet, identified in the study as XG196/96, outperformed the others. This particular configuration allowed the motor to reach an efficiency of 87.56 percent, which was the highest among the group. In contrast, the least efficient magnet configuration managed only about 85.2 percent efficiency. The difference might seem small, but in the world of electric vehicles, even a fraction of a percent in efficiency translates to more miles driven on the same battery charge.

The study also broke down exactly where the energy was going and where it was being lost. With the best-performing magnet, the motor showed reduced losses across the board. The copper windings, which carry the electric current, lost about 203.7 watts of power as heat. The iron core, which guides the magnetic field, lost 14.77 watts. Even the electronic components that switch the current on and off, such as transistors and diodes, contributed to the total loss, but the team was able to quantify these amounts precisely. The friction and windage losses, which are the energy costs of the motor spinning through the air and the mechanical resistance of its moving parts, were kept very low at just 12 watts. By comparing these numbers across the six different designs, the researchers could see that the choice of magnet directly influenced the current flowing through the motor, which in turn dictated how much energy was wasted. The XG196/96 magnet required less current to do the same amount of work, which is why it generated less heat and wasted less energy.

Beyond just efficiency, the researchers looked at how smoothly the motor would run. A common problem with electric motors is "cogging," a jerky sensation that happens when the magnetic teeth of the rotor and stator catch against each other. This can cause vibration and noise, which is unpleasant for a driver. The simulations showed that the chosen design produced a very smooth torque, meaning the turning force was steady and consistent. The magnetic field inside the motor was distributed evenly, and the electrical signals that drive the motor were clean and symmetrical. The team also checked the motor's ability to start moving from a standstill, a critical moment for any vehicle. The simulation indicated that the motor could produce a starting torque nearly four times higher than its normal operating torque, suggesting it would accelerate strongly when needed.

The work presented in this paper is a simulation study, meaning the results come from a sophisticated computer model rather than a physical machine on a test bench. However, the level of detail in the modeling is high, accounting for the specific properties of the steel, the exact shape of the magnets, and the behavior of the electrical currents. The researchers did not claim to have built a new car or a new motor that is ready for the showroom floor. Instead, they provided a rigorous blueprint and a proven method for selecting materials. They demonstrated that by carefully choosing the right magnet, it is possible to design a motor that is both cost-effective and highly efficient. For the future of electric transportation, where every watt of energy counts, this kind of precise engineering is essential. The study concludes that the XG196/96 magnet offers the best trade-off between performance and cost, providing a solid foundation for the next generation of electric vehicle drives.