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The Revelation Engine from Harley Is Completely Distinct and Seems to Be Gaining Even More Popularity in the Market. This Electric Engine Allows for Oil Change and Emits a Sound Similar to Traditional Motorcycles.
This electric motor powers the LiveWire and, surprisingly, has an oil change feature, even though it is electric. Developed in partnership with Mission Motors, a renowned American brand of high-performance electric motorcycles, the Revelation engine from Harley represents a significant advancement in motorcycle technology.
Harley Presented Project in 2014
It is clear that, being a Harley engine, the sound could not be overlooked, even being electric. The brand ensured that this Revelation engine produced a real mechanical sound, not a simulated sound, as some manufacturers are doing.
Harley introduced the Livewire project to the public in 2014, and the motorcycle’s design does not deny inspiration from the old XR models, showcasing a more roadster style. The focus is on an attempt to attract fresh blood to the company once again. The LiveWire features a Harley engine called Revelation, which is positioned at the bottom of the motorcycle, clearly visible.
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Costing R$ 16,000, the new Yamaha features a 125 cc hybrid engine with electric assistance, delivers 8.3 hp, includes ABS, optimized fuel consumption, Y-Connect connectivity, 25 liters of storage space, and a surprising 4-year warranty in the urban segment.
The propulsor features a Harley electric motor of the PMAC type or permanent magnet alternating current motor. It consists basically of a stator where the coils are located and a rotor with permanent magnets. The stator is made of silicon steel plates with various grooves, where we have coils made of copper wire strategically positioned.
When energized, they generate a magnetic field that can be controlled by a device called a frequency inverter. It will convert the direct current from the battery, where we have positive and negative poles, into alternating current.
The inverter has three outputs, and as we have the positive and negative alternating at each output, we call this output a phase. Each phase will alternately switch between positive and negative, but are offset by 120º from each other.
How Does the Electric Engine System from Harley Work?
The Revelation engine is a permanent magnet synchronous motor, which means its rotor has magnets that will align with the rotating magnetic field. As these magnets are attached to the rotor, they will cause the rotor to spin.
The frequency inverter can change the engine speed by simply increasing or decreasing the frequency of the alternating current. The intensity of the magnetic field can be maximum even with the Harley electric motor’s shaft locked. Thus, the Revelation can produce torque on its shaft even at zero RPM.
The rotor of the Harley’s motor is mounted on bearings. Basically, the rotor is the only moving part of an electric motor that simply spins on the bearings. The electric motor itself does not produce sound, and we only have a small noise from the bearings, which is practically inaudible. However, the LiveWire has a very evident mechanical sound. This is where we enter the most interesting part of the Revelation engine: the gearbox.
Where Does the Sound from Harley’s Engine Come From?
Electric motors have a wide usable rotation range and can easily rotate above 15,000 RPM without any effort and, in addition, can deliver their very high torque from 0 RPM.
However, it is clear that you cannot connect a motor of this category spinning from 0 to 15,000 RPM directly to the wheels, but with this rotation range and nearly linear torque and power delivery, it is also unnecessary to have gears, just a single gear reduction.
The Harley electric motor goes through a reducer, consisting of helical bevel gears that, besides reducing the high rotation of the motor into torque, transfer the movement from the motor shaft to an output shaft at 90º.
This gear system generates a characteristic noise, and it is responsible for the mechanical sound of this Harley engine.
Despite this characteristic noise, be aware that helical gears like those used in the Revelation engine tend to be quieter compared to straight-toothed gears, which are quite loud, but at this rotation even helical gears emit sounds.
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