It could be too early to say that the auto business is present process an excellent electrification. However increasingly more automakers are headed in that course as product pipelines swell, with new battery-electric automobiles arriving over the subsequent few years. Take Basic Motors—it plans to carry 22 new BEVs to market between now and 2023, beginning with a reborn GMC Hummer to be debuted later this September. To make issues easier, GM is standardizing the parts it should use to construct what guarantees to be all kinds of automobiles.
We already learned a little about GM’s modular Ultium battery packs, which it claims will break the $100/kWh barrier “early within the platform’s life.” Because the reveal of the Hummer approaches, the corporate is opening up about different features of its new BEV brigade. And this week it was time for motors to take to the stage. GM has developed a brand new household of modular drive models known as Ultium Drive that it’ll combine and match in automobiles, crossovers, SUVs, and vehicles.
In complete, there are 5 drive models, every of which integrates the facility electronics in addition to the electrical motors. There are drive models for front-wheel drive, rear-wheel drive, and an help all-wheel drive unit, after which a pair of drive models for vehicles. One in all these can be utilized for the entrance or rear axle, whereas the opposite is a twin motor drive unit for rear axles. And inside every drive unit is certainly one of three electrical motors within the Ultium Drive household: a everlasting magnet main front-wheel drive motor, a everlasting magnet main drive motor that is completely satisfied in both front- or rear-wheel drive configurations, and a smaller induction magnet help motor.
“We went with a modular technique, so there are three motors inside of those drive models that scale—they seem like siblings and interchange a whole lot of components—after which the drive models themselves additionally interchange a whole lot of components. They’ve frequent manufacturing locators so a number of various kinds of drive models can run down the identical manufacturing line. And since they share components, and since they’re versatile, we will actually leverage our scale: we will alter various kinds of drive models by car combine; we will supply parts at actually excessive volumes, and we will vertically combine way more of the drive models than we had earlier than,” defined Adam Kwiatkowski, GM’s govt chief engineer of electrical automobiles.
GM remains to be being coy about energy and torque outputs for the motors. We all know that the GMC Hummer will use three motors in complete (a entrance truck drive unit and the dual-motor truck drive unit, at a guess) with a mixed output of 745kW (1,000hp). Kwiatkowski would not be drawn extra on the specs aside from to inform me that each energy and torque density (i.e. the quantity of energy or torque divided by the quantity of the motor) can be business main.
Kwiatkowski advised me that the method of creating a brand new household of electrical motors wasn’t all that completely different to designing a brand new inner combustion engine, one thing that occupied him for the primary 15 years of his profession. “Lots of the identical tenets and concepts are utterly fungible within the electrical propulsion house. So issues like interchangeability, frequent datums and manufacturing locators; issues that permit us to scale and vertically combine these ideas are simply a part of our propulsion design DNA at GM,” he advised me.
Then once more, GM has a little bit of expertise with electrical motor design, too, due to the Volt, Bolt, and EV1. As you may anticipate, the principle focus for this third technology of electrical motors has been effectivity. “We would like each single joule of electrical vitality that goes into the motor to propel the wheels. So we had been actually targeted on lowering losses inside the unit, whether or not it’s i2r losses or magnetic losses or switching losses,” he mentioned.
Itemizing picture by Basic Motors