The Electric Motor: From Electrons to Motion
An electric motor works by exploiting the interaction between magnetic fields and electric current. When current flows through copper windings inside the motor, it creates an electromagnetic field. This field interacts with permanent magnets (in a PMSM — Permanent Magnet Synchronous Motor) or an induced magnetic field (in an AC induction motor) to produce rotational force, called torque. Tesla's Model 3 rear motor, for example, uses a PMSM that produces 283 lb-ft of torque instantaneously from 0 RPM. This is fundamentally different from a gasoline engine, which must rev up through its power band before delivering peak torque, typically between 1,500 and 4,500 RPM. Because EV motors deliver full torque the moment you press the accelerator, electric cars feel dramatically more responsive, accelerating from 0 to 60 mph in 3–4 seconds even in mid-range models. The motor is also extraordinarily efficient — modern EV motors convert roughly 90–95% of electrical energy into mechanical work, compared to 25–40% thermal efficiency for the best internal combustion engines.