Tech Features

A closer look at torque ripple – minimizing its effects on electric machines

The Switched Reluctance Motor, or SRM, is often discussed as a prime choice for the next-generation EV traction motor. It is simple, robust, and arguably the least expensive of all motor types to manufacture. However, SRMs are notoriously difficult to control, and prone to emitting significant amounts of vibration and acoustic noise. The good news… Read more »

Dana kicks copper to the curb in favor of all-aluminum cooling products for EVs

In 1982, the US Mint made the practical decision to change the composition of the penny coin from 95% copper/5% zinc – an alloy you know as brass – to 97.5% zinc with copper plating. Inflation had pushed the price of copper in a penny above one cent, and zinc was significantly less expensive and… Read more »

UQM Technologies grows from pioneer to power player in vehicle electrification

With its integrated electric propulsion systems spreading across the globe in all conceivable vehicle types, UQM Technologies could be called the biggest little company in the EV industry. Over the past few years, the company seems to have entered its prime, as in one of those TV commercials where a deep, authoritative voice tell us… Read more »

Human-machine interface experts on the nuances of displaying and interacting with EV data

Few have been working on human-machine interface (HMI) design for EV drivetrains as long as Brian Gallagher and Kevin Coelho. In 2007, Gallagher joined the startup Aptera Motors as employee number three. Shortly after, Coelho joined him as the seventh addition to the California company, which was building ultra-efficient three-wheeled electric vehicles. Five years later,… Read more »

Wildcat Discovery Technology creates new experiments to accelerate battery research

The pulse of the industry: Wildcat Discovery Technology is at the forefront of battery research, solving problems and accumulating insight. When Charged wants to catch up on the newest trends in cutting-edge battery technology, there are a few companies we turn to for insight. At the top of the list is a group whose high-speed… Read more »

LG Chem Power CEO: We’re the Li-ion leader for PEVs because of material science

Q&A with LG Chem Power’s CEO: Dr. Prabhakar Patil on how the company became a Li-ion battery front-runner, the economics of building batteries, and why it spends little energy on what comes after lithium. Among Tier 1 automotive suppliers of lithium-ion cells, LG Chem is off to a clear lead, based on the number of announced… Read more »

The future of integrated inverters: Press-fit solderless interconnects and smarter design

Interplex, the complex assemblies expert, on power electronics, the automotive industry and the continuous drive for smarter design Power modules containing high-power insulated-gate bipolar transistors (IGBTs) are at the core of most modern inverters. These modules are the electronic muscle of the system. They perform all the switching, and they generate all the heat. But… Read more »

Ionic liquid electrolytes may open the door for higher-voltage batteries

The curious case of ionic liquids: Boulder Ionics/CoorsTek Specialty Chemicals Iolyte electrolytes When you think of liquids under the brand name Coors, you think of the Silver Bullet, the Banquet Beer. You certainly don’t think of high technology, unless you’re really easily impressed by cold-activated cans. However, not everyone knows that there’s another huge conglomerate under… Read more »

Siemens saves weight and space with integrated motor and inverter

Screw it in and drive Among the companies pushing the boundaries of packaging efficiency is the German engineering colossus Siemens. The company has developed an integrated motor and inverter contained in a single housing, the Siemens Sivetec MSA 3300. The new drive unit reduces weight, frees up six to seven liters of additional space, lowers… Read more »

The EVSE GMI circuit: Should the standards be changed?

Leviton’s Director of Engineering explains the EVSE GMI circuit and why he believes the standards should be changed. One of the many safety features integrated into EVSE is the ground monitor interrupter (GMI) circuit. The GMI circuit ensures that the ground path is connected from the vehicle chassis all the way to the electric service… Read more »