You can apply such a large amount of power to the wheels so quickly in an EV that it would actually be impossible for a gearbox to be installed in most cases. The way torque can be applies would shred apart a traditional gearbox. At the top end, EV’s can reach 10,000 RPM’s and some can even reach as high as 20,000.Įqually, the reason why many EV’s lack a gearbox or transmission is also because of it’s torque curve. When a EV is stationary the RPM is 0 and there is no fear of the motor stalling. One of the reasons electric motors can survive at that RPM range is due to the limited number of moving parts within the motors. This means that there is no need for a traditional gearbox to keep the motor in any “sweet spot”. To summarize this video, however, EV motors function well at a broad RPM range. Video can’t be loaded because JavaScript is disabled: Why Do Electric Cars Only Have 1 Gear? () If you’re interested in the maths behind this, a great video is: As a result, an electric car only needs a single gear to function (unlike the ‘fussier’ ICEs which require gears to deliver the best torque). They have high-RPM electric motors which can apply the necessary torque in a much more fine-grained, consistent approach across RPM levels. This is entirely different with electric cars. Hence to keep things efficient, ICE (aka gasoline) cars have multiple gears which allow the engine to spin at the most ideal RPM range for the most ideal torque to be applied. In conventional ICE cars, the ICE only generates usable torque in a fairly narrow band of RPM (engine ‘spin’ speed). This is done by applying torque (rotational ‘movement’ energy). So as we mentioned above, the transmission is designed to ultimately turn the wheels. It usually needs changing every 30,000 miles or so in a conventional car. It also helps to cool things down, acting as a heat dissipator. In an automatic car, there’s an automatic transmission/gear shifter system which detects when a gear needs to change and applies this disconnect and change automatically.īecause this is a mechanical operation (aka there’s various moving parts), transmission fluid is needed to keep all the parts working together smoothly: transmission fluid is a slippery lubricant liquid. In a manual car, the clutch is the thing that allows you to ‘disconnect’ and change gear. Whilst with a gasoline car, the transmission is the thing that provides the necessary disconnect with the engine to allow for the gear to be shifted upwards or downwards. With a bicycle, this is done via the chain operation. However gears can’t simply be changed to another gear: since it’s a mechanical operation, a ‘disconnect’ is needed before the gear can be changed up or down. Transmission/gearing mechanism from a conventional car, via FreeImages
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