How Do Tesla Cars Work? (EVs Explained)

Tesla was founded on the 1st of July in 2003 by a group of engineers based in San Carlos, California.

They launched their first electric car 5 years later in 2008 – the Roadster.

Since then, they have gone on to design the world’s first-ever premium all-electric sedan, the Model S, along with many more mind-boggling electric cars that all use the same cutting-edge battery technology Tesla has become so famous for.

Unique visual design aside, you may be asking yourself…

How exactly do Tesla cars work?

Tesla vehicles, also referred to as Electric Vehicles (EVs), employ an electric motor in lieu of an internal combustion engine. These automobiles are powered by a substantial traction battery pack that supplies energy to the electric motor. By relying on electricity, Tesla cars circumvent the production of exhaust emissions and eliminate the traditional liquid fuel components, including fuel lines, fuel pumps, and fuel tanks.

In this article, we aim to dissect a Tesla car and explain how each component works in detail.

How Do Tesla Cars Work?

Induction Motor

The first induction motor was invented by Nikola Tesla around 100 years ago. It has two main parts, the stator and the rotor.

The rotor is simply a collection of conducting bars short-circuited by end rings. A 3-phase AC power output is given to the stator.

The three-phase AC in the coils produces a magnetic field. Tesla motors produce a four-pole magnetic field.

This rotating magnetic field induces a current on the rotor bars to make them turn. In an induction motor, the rotor usually lags behind the rotor speed (RMF speed)

An induction motor has neither brushes nor a permanent magnet yet remains very powerful.

The fantastic thing about induction motors is that the rotation speed depends on the frequency of the AC power supply.

This means the speed at which the wheel turns can be altered by simply varying the frequency of the power supply.

This fact makes speed control on a Tesla easy and reliable. In fact, a Tesla motor can range from 0 to 18,000 RPM.

Inverter

The battery pack is what supplies the induction motor with power.

However, it produces DC power, this means that before the supply can get to the motor, it has to be converted from DC to AC power.

This is where the inverter comes into play.

Not only does the invert convert DC to AC, it also controls the AC power frequency, thus controlling the motor speed.

The inverter can even shift the amplitude of the AC motor, which in turn controls the motor output power. Essentially, the inverter acts as the brain of the electric car.

Battery Pack

This may come as a surprise to most, but the battery packs consist of vast collections of common lithium-ion battery cells, similar to those used in your everyday life.

All these cells are interconnected in a combination of series and parallel to produce the required power to run the electric car.

Glycol coolant is passed through metallic inner tubes that intertwine through the small gaps between the cells. This is one principle that sets Tesla apart from other electric car manufacturers.

By using many small cells instead of a few big cells, essential cooling is guaranteed. This reduces thermal hot spots, which produce even temperature distribution among the many cells – leading to higher battery pack life.

All these cells are arranged in detachable modules, leading to about 16 of these modules, which include around 7000 cells.

Do Tesla Cars Break Down Often?

Just how reliable are Tesla cars?

Scientific research has demonstrated that the Tesla Model S can remain operational even after covering a distance of over 400,000 miles (equivalent to 643,737 km) and exhibits infrequent breakdowns. The reason behind this outstanding durability lies in the electric vehicle’s reliance on fewer mechanical components. With fewer moving parts, the probability of malfunctioning is significantly reduced.

When it comes to fuel-powered cars, one of the main causes of a breakdown is a faulty battery.

Now, what about a Tesla car that relies on thousands of battery cells in order to work?

Well, Tesla as a company has not been collecting data long enough to answer this question accurately for all of their vehicles (especially the newer Model 3 and Model Y).

However, we do have quite a few years of data for their slightly older models, like the Model S and Model X.

Below we have created two tables breaking down each model’s battery capabilities:

The above data are broad estimates. Obviously, the battery retention capacities will vary from driver to driver depending on individual driving habits, driving temperature, and fast charging frequency.

What Breaks The Most On Tesla Cars?

Based on industry data and user reports, the most common things to break on a Tesla are:

• Suspension components






• Brake pads

This is likely attributed to the inherent weight of electric vehicles, which tends to be greater than their internal combustion engine counterparts and places more significant stress on the vehicle’s suspension and braking systems.

With that being said, Tesla continues to refine and improve the design of its vehicles, resulting in longer-lasting components and fewer required repairs.

Is A Tesla Car Expensive To Maintain?

Below we have collected and put together data from Tesloop, which has kept a record of its Tesla Model S maintenance expenses over a period of 450,000 miles.

In the table, we will focus on the following:

• RSM – Regular scheduled maintenance






• GVR – General vehicle repairs

Below is a summary of the tables: