Electric cars typically use electric motors that are based on alternating current (AC) technology. AC motors are more efficient and less expensive than their di
Electric cars typically use electric motors that are based on alternating current (AC) technology. AC motors are more efficient and less expensive than their direct current (DC) counterparts, and they are also well-suited to the high-power applications used in electric vehicles.
AC motors work by using an electromagnet to convert electrical energy into mechanical energy. When an AC current flows through the windings of the electromagnet, it creates a magnetic field that interacts with the magnetic field of the rotor, causing the rotor to rotate.
The key advantage of AC motors is that they can easily be controlled using a simple device called a thyristor, which allows the user to adjust the current flowing through the motor. This allows the user to precisely control the speed and torque of the motor, which is important in applications like electric vehicles where smooth and responsive acceleration is critical.
In contrast, DC motors use brushes and a commutator to transfer current from the stator to the rotor. This design is less efficient and less precise than the AC motor, which is why it is less commonly used in electric vehicles.
Additionally, AC motors are typically more durable and require less maintenance than DC motors, which is another important factor in the demanding operating environment of an electric vehicle.
Despite the many advantages of AC motors, some electric vehicles do use DC motors. For example, the Tesla Roadster uses a custom AC motor design, but the Tesla Model S and Model X use DC motors.