Get Your Electric Motor Running

Get Your Electric Motor Running Get Your Electric Motor Running When we think of electric transportation, thoughts quickly turn to Teslas, Leafs, and electric cars will be the wave of the future. But lost in the undertow may be the electric motorcyclea two-word term many people have never even uttered. But with creations such as the Mission R Cycle and its speeds in excess of 150 mph, that may be changing.Karl Johnson, mechanical engineer for Mission Motors , San Francisco, CA, explains how the electric motorcycle drivetrain works. Its battery pack, motor controller, which changes from DC to AC current, and that supplies the electric motor with the AC current. Those building blocks make up the energy storage and supply the force for acceleration. There are no moving parts besides the bearings. We dont have any camshafts or a transmission, just direct drive, one gear. A single gear welches a great simplification in terms of packaging.Speed FocusFor the company, they shot for eye-openi ng speeds to, at the very least, overcome a myth. Its been put out there that electric lacks in performance, he says. Its important to do everything you can to give people confidence.Just as impressive may be that it can go from 0-60 in less than three seconds. A great part of electric vehicles is all of the torque from zero rpm, he says. You dont have to slip in the clutch to get going, youre not shifting, all thats taken out for accessibilityeven for people without a lot of experience. According to the company website, the bike actually starts with 120 ft/lbs of torque.In addition, it has a range of 100-150 miles. Johnson says they continue to work on improving it even though most sport bike riders go no longer than 60-100 miles per trip in his estimation.Mission Rs powertrain is contained within a package one-tenth the size and weight of an equivalent traditional internal combustion engine. Image Mission MotorsErgonomics AngleLooking back, the biggest challenge in building the Mi ssion R was actually in creating the battery pack. Trying to get a defining balance between weight and energy and then fitting a battery pack into the vehicle in an ergonomic way was tough, Johnson says. You want to make sure the battery pack isnt poking out where a riders knee should be. There is a fairly defined shape for the battery cell we useits a thin rectangleand we had to package those into modules and then package the modules into a battery pack.For the ergonomics, they went about things a little differently. When it comes to ergonomics, many spend a lot of time doing preliminary work, sitting on it and feeling things out. Changing it by putting clay on and shaving it down, fine-tuning the shape. We instead went straight from a CAD model developed by the stylist Tim Prentice into molds for body work, and we assembled it. I think its the first time he did it without any clay and he was excited by how well it turned out. The riding position is an aggressive one so when youre on track you can deal with nice twisties.In the future, theyre shooting for a more partal riding experience. So many parameters can change how the vehicle performs and weve talked about having the person step up to the motorcycle, have it recognize you, and adjust to how you want to ride, he says. That would be funEric Butterman is an independent writer.Its been put out there that electric lacks in performance. Its important to do everything you can to give people confidence.Karl Johnson, Mission Motors