Electric and internal combustion engines have been at the forefront of the conversation about the future of mobility and industry for years . While electric vehicles are making a strong entrance thanks to their features and technological advancements, traditional engines have been the mainstay of transportation for over a century.
In this article, you'll discover clearly and in depth how each type of motor works , their main structural differences, environmental impact, efficiency, key components, and why electric vehicles are gaining ground in global mobility. If you've ever wondered what makes them different or which is the best option for each need , here's the information you need.
Essential comparison between electric and internal combustion engines…
The main difference between an electric motor and a combustion engine is the source and method by which they obtain the energy needed to move a vehicle. Internal combustion engines work by burning fossil fuels—such as gasoline or diesel—in a process of controlled explosions inside cylinders. These explosions move pistons which, through mechanisms like the crankshaft and gearbox, transmit power to the vehicle's wheels.
In contrast, an electric motor operates by converting the energy stored in a battery (in the form of electricity) into mechanical energy. Through a controlled discharge, the motor uses magnetic fields to cause the shaft to rotate, which translates into movement at the wheels. Thus, the transmission is usually more direct and simpler.
Components and operation of an electric motor…
Electric motors , especially those designed for vehicles, are notable for having a less complex structure and far fewer moving parts than combustion engines. This not only reduces weight but also minimizes maintenance and decreases the likelihood of breakdowns.
- Battery: It's the energy accumulator that stores the necessary electricity. It's equivalent to the fuel tank of a traditional car.
- Investor: It converts the direct current (DC) from the battery into alternating current (AC), which is necessary to power the electric motor.
- Electric motor: Composed mainly of the estor (fixed part that generates a magnetic field) and the rotor (moving part that rotates when receiving magnetic impulses).
- Speed ​​reducer: It's the equivalent of a gearbox. It generally has only one fixed ratio, as the available torque allows it to operate from zero to high speeds without the need for multiple gears.
- Electronic control and management system: It regulates the flow of energy from the battery to the motor, determining speed, acceleration, and even regenerative braking.
- regenerative braking: It allows the motor to reverse its function during braking or stopping and recharge the battery by taking advantage of the vehicle's inertia.
- Refrigeration system: Although less demanding than combustion engines, it helps keep the engine at an optimal temperature, especially during intensive use.
The process begins when the driver presses the accelerator: the battery releases electricity that reaches the inverter, which transforms the current and powers the motor; the stator creates a magnetic field that induces the rotary movement of the rotor, directly transmitting the power to the wheels.
How does an internal combustion engine work?
In combustion engines, the cycle begins with the injection of fuel into a chamber where compressed air and a spark plug (in gasoline engines) or pressure (in diesel engines) cause an explosion. This explosion pushes the pistons, which in turn move the crankshaft and the rest of the transmission system. The process consists of different phases:
- Admission: Air-fuel mixture inlet into the cylinder.
- Compression: The piston rises and compresses the mixture.
- Explosion: Combustion occurs, the mixture ignites and expands.
- Escape: The resulting gases are expelled through the exhaust pipe.
This engine involves a large number of moving parts: pistons, connecting rods, valves, camshafts, crankshaft, gearbox, clutch, exhaust system and a long etcetera, which increases maintenance needs and raises the chances of breakdown.
Key elements of electric motors…
Let's take a closer look at the most important internal components of the electric motor:
- Stator: Fixed part composed of windings or permanent magnets. It is responsible for creating the necessary magnetic field.
- Rotor: A moving part that rotates under the influence of the stator's magnetic field. It may contain permanent magnets or coils.
- Bearings: They allow the rotor to rotate smoothly and precisely. Their good condition is key to avoiding vibrations and noise.
- Eje: It transmits the generated movement to the outside of the engine, connecting to the transmission and, finally, to the wheels.
- Connections Box: Secure housing for electrical cables and terminals, protecting the system from contaminants and ensuring a stable connection.
- housing: It encloses and protects internal components from dust, moisture, and potential impacts. It also contributes to heat dissipation.
- Fan and covers: They help expel the heat generated to maintain an optimal operating temperature.
- Commuter: In certain electric motors, it maintains the direction of the current to ensure that the torque remains constant.
- Identification plate: It includes essential technical information such as supported voltage, revolutions per minute, power, and safety parameters.
Most commonly used types of electric motors in the automotive industry…
- Permanent Magnet Synchronous Motor (PMSM): It uses permanent magnets in the rotor, synchronized with the stator's magnetic field. It stands out for its high efficiency, instant acceleration, and more compact dimensions.
- Asynchronous (or induction) motor: The rotor lacks magnets and creates its own magnetic field through induced currents. It's more economical and resistant to high temperatures, although somewhat less efficient.
- Switched reluctance motor: Very robust, it offers high torque and is perfect for demanding applications, although it is usually noisier.
- Permanent magnet brushless motor: Used in hybrid vehicles, it combines robustness with a very long service life due to the absence of wear parts.
Exterior and interior differences between both engine types…
The electric motor is characterized by not requiring an exhaust pipe or intake system, and there is usually much less visible under the hood than in a conventional vehicle. Some models utilize the extra space for additional storage, and the trunk typically loses some capacity due to the battery placement. The overall weight of an electric vehicle usually increases due to the mass of the batteries, although the weight distribution is generally more even, improving stability and dynamic handling on the road.
Energy efficiency and performance…
One of the strengths of electric motors is their impressive efficiency. On average, they convert between 85 and 95% of electrical energy into useful mechanical energy. In contrast, combustion engines rarely exceed 40%, losing a large portion as heat and mechanical friction.
This translates into significant energy savings, reduced emissions, and less waste heat. Furthermore, the electric motor delivers instant torque, enabling faster acceleration and immediate throttle response. Learn more about inboard motor efficiency.
Maintenance and lifespan of electric motors versus combustion engines
The maintenance required for an electric motor is significantly less. Forget about changing the oil, all the filters, spark plugs, or complex gearbox overhauls. The main tasks focus on checking the cooling system, the inverter, the battery, and the motor bearings. The fewer number of moving parts reduces the likelihood of breakdowns and lowers long-term ownership costs. Furthermore, fewer parts mean less potential for wear and tear and greater reliability.
Environmental impact and sustainability…
Electric motors do not generate direct COâ‚‚ emissions or other polluting gases , making them a key option for mitigating pollution and combating climate change. This lack of emissions, along with the possibility of charging with renewable energy sources, represents a significant reduction in the carbon footprint. In cities, electric cars also help reduce ambient noise, providing quieter and healthier urban environments.
Why choose an electric motor today?
- Savings in energy and maintenance costs: The price of electricity is lower and the cost of technical inspections is drastically reduced.
- Expanding charging infrastructure: There are an increasing number of public and private charging stations, making everyday use easier.
- Innovation and technological evolution: Batteries offer ever-increasing ranges, and the efficiency of electric motors continues to improve year after year.
- Greater comfort: Silence, absence of vibrations, and a smooth ride make for an unbeatable onboard experience.
- Contribution to environmental sustainability: You help reduce pollution and the consumption of fossil resources.
Energy monitoring and efficiency improvement…
Energy efficiency is essential in industry and electric vehicles. Monitoring parameters such as current, three-phase voltage, and power factor allows for optimized consumption, anticipation of failures, and more sustainable and cost-effective processes. The use of IoT systems and smart sensors helps reduce unexpected downtime, monitor bearing condition, and prevent overheating or excessive consumption.
Electric motors are redefining how we move and produce . Their mechanical simplicity, efficiency, sustainability, and low maintenance are compelling arguments against traditional internal combustion technology. Choosing an electric motor means opting for more efficient, quieter, and environmentally friendly mobility, as well as offering a more agile and distinctive driving experience.