California's Looming Green New Car Wreck


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California Gas Car Ban 2035 signals a shift to electric vehicles, raising grid reliability concerns, charging demand, and renewable energy challenges across solar, wind, and storage, amid rolling blackouts and carbon-free power mandates.

 

Key Points

An order ending new gasoline car sales by 2035 in California, accelerating EV adoption and pressuring the power grid.

✅ 25% EV fleet could add 232.5 GWh/day charging demand by 2040

✅ Solar and wind intermittency strains nighttime home charging

✅ Grid upgrades, storage, and load management become critical

 

On September 23, California Gov. Gavin Newsom issued an executive order that will ban the sale of gasoline-powered cars in the Golden State by 2035. Ignoring the hard lessons of this past summer, when California’s solar- and wind-reliant electric grid underwent rolling blackouts, Newsom now adds a huge new burden to the grid in the form of electric vehicle charging, underscoring the need for a much bigger grid to meet demand. If California officials follow through and enforce Newsom’s order, the result will be a green new car version of a train wreck.

In parallel, the state is moving on fleet transitions, allowing electric school buses only from 2035, which further adds to charging demand.

Let’s run some numbers. According to Statista, there are more than 15 million vehicles registered in California. Per the U.S. Department of Energy, there are only 256,000 electric vehicles registered in the state—just 1.7 percent of all vehicles, a share that will challenge state power grids as adoption grows.

Using the Tesla Model3 mid-range model as a baseline for an electric car, you’ll need to use about 62 kilowatt-hours (KWh) of power to charge a standard range Model 3 battery to full capacity. It will take about eight hours to fully charge it at home using the standard Tesla NEMA 14-50 charger, a routine that has prompted questions about whether EVs could crash the grid by households statewide.

Now, let’s assume that by 2040, five years after the mandate takes effect, also assuming no major increase in the number of total vehicles, California manages to increase the number of electric vehicles to 25 percent of the total vehicles in the state. If each vehicle needs an average of 62 kilowatt-hours for a full charge, then the total charging power required daily would be 3,750,000 x 62 KWh, which equals 232,500,000 KWh, or 232.5 gigawatt-hours (GWh) daily.

Utility-scale California solar electric generation according to the energy.ca.gov puts utility-scale solar generation at about 30,000 GWh per year currently. Divide that by 365 days and we get 80 GWh/day, predicted to double, to 160 GWh /day. Even if we add homeowner rooftop solar, and falling prices for solar and home batteries in the wake of blackouts, about half the utility-scale, at 40 GWh/day we come up to 200 GW/h per day, still 32 GWh short of the charging demand for a 25% electric car fleet in California. Even if rooftop solar doubles by 2040, we are at break-even, with 240GWh of production during the day.

Bottom-line, under the most optimistic best-case scenario, where solar operates at 100% of rated capacity (it seldom does), it would take every single bit of the 2040 utility-scale solar and rooftop capacity just to charge the cars during the day. That leaves nothing left for air conditioning, appliances, lighting, etc. It would all go to charging the cars, and that’s during the day when solar production peaks.

But there’s a much bigger problem. Even a grade-schooler can figure out that solar energy doesn’t work at night, when most electric vehicles will be charging at homes, even as some officials look to EVs for grid stability through vehicle-to-grid strategies. So, where does Newsom think all this extra electric power is going to come from?

The wind? Wind power lags even further behind solar power. According to energy.gov, as of 2019, California had installed just 5.9 gigawatts of wind power generating capacity. This is because you need large amounts of land for wind farms, and not every place is suitable for high-return wind power.

In 2040, to keep the lights on with 25 percent of all vehicles in California being electric, while maintaining the state mandate requiring all the state’s electricity to come from carbon-free resources by 2045, California would have to blanket the entire state with solar and wind farms. It’s an impossible scenario. And the problem of intermittent power and rolling blackouts would become much worse.

And it isn’t just me saying this. The U.S. Environmental Protection Agency (EPA) agrees. In a letter sent by EPA Administrator Andrew Wheeler to Gavin Newsom on September 28, Wheeler wrote:

“[It] begs the question of how you expect to run an electric car fleet that will come with significant increases in electricity demand, when you can’t even keep the lights on today.

“The truth is that if the state were driving 100 percent electric vehicles today, the state would be dealing with even worse power shortages than the ones that have already caused a series of otherwise preventable environmental and public health consequences.”


California’s green new car wreck looms large on the horizon. Worse, can you imagine electric car owners’ nightmares when California power companies shut off the power for safety reasons during fire season? Try evacuating in your electric car when it has a dead battery.

Gavin Newsom’s “no more gasoline cars sold by 2035” edict isn’t practical, sustainable, or sensible, much like the 2035 EV mandate in Canada has been criticized by some observers. But isn’t that what we’ve come to expect with any and all of these Green New Deal-lite schemes?

 

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GM Canada announces tentative deal for $1 billion electric vehicle plant in Ontario

GM Canada-Unifor EV Deal outlines a $1B plan to transform the CAMI plant in Ingersoll, Ontario, building BrightDrop EV600 delivery vans, boosting EV manufacturing, creating jobs, and securing future production with government-backed investment.

 

Key Points

A tentative $1B deal to retool CAMI for BrightDrop EV600 production, creating jobs and securing Canada's EV manufacturing.

✅ $1B to transform CAMI, Ingersoll, for BrightDrop EV600 vans

✅ Ratification vote set; Unifor Local 88 to review details

✅ Supports EV manufacturing, delivery logistics, and new jobs

 

GM Canada says it has reached a tentative deal with Unifor that if ratified will see it invest $1 billion to transform its CAMI plant in Ingersoll, Ont., to make commercial electric vehicles, aligning with GM's EV hiring plans across North America.

Unifor National President Jerry Dias says along with the significant investment the agreement will mean new products, new jobs amid Ontario's EV jobs boom and job security for workers.

Dias says in a statement that more details of the tentative deal will be presented to Unifor Local 88 members at an online ratification meeting scheduled for Sunday.

He says the results of the ratification vote are scheduled to be released on Monday.

Details of the agreement were not released Friday night.

A GM spokeswoman says in a statement that the plan is to build BrightDrop EV 600s -- an all-new GM business announced this week at the Consumer Electronics Show and part of EV assembly deals that put Canada in the race -- that will offer a cleaner way for delivery and logistics companies to move goods more efficiently.

Unifor said the contract, if ratified, will bring total investment negotiated by the union to nearly $6 billion after new agreements were ratified with General Motors, Ford, including Ford EV production plans, and Fiat Chrysler in 2020 that included support from the federal and Ontario governments, and parallel investments such as a Niagara Region battery plant bolstering the supply chain.

It said the Ford deal reached in September included $1.95 billion to bring battery electric vehicle production to Oakville via the Oakville EV deal and a new engine derivative to Windsor and the Fiat Chrysler agreement included more than $1.5 billion to build plug-in hybrid vehicles and battery electric vehicles.

Unifor said in November, General Motors agreed to a $1.3 billion dollar investment to bring 1,700 jobs to Oshawa, as Honda's Ontario battery investment signals wider sector momentum, plus more than $109 million to in-source new transmission work for the Corvette and support continued V8 engine production in St. Catharines.

 

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BWE - Wind power potential even higher than expected

German Wind Power 2030 Outlook highlights onshore and offshore growth, repowering, higher full-load hours, and efficiency gains. Deutsche WindGuard, BWE, and LEE NRW project 200+ TWh, potentially 500 TWh, covering rising electricity demand.

 

Key Points

Forecast: efficiency and full-load gains could double onshore wind to 200+ TWh; added land could lift output to 500 TWh.

✅ Modern turbines and repowering boost full-load hours and yields

✅ Onshore generation could hit 200+ TWh on existing areas by 2030

✅ Expanding land to 2% may enable 500 TWh; offshore adds more

 

Wind turbines have become more and more efficient over the past two decades, a trend reflected in Denmark's new green record for wind-powered generation.

A new study by Deutsche WindGuard calculates the effect on the actual generation volumes for the first time, underscoring Germany's energy transition balancing act as targets scale. Conclusion of the analysis: The technical progress enables a doubling of the wind power generation by 2030.

Progressive technological developments make wind turbines more powerful and also enable more and more full-load hours, with wind leading the power mix in many markets today. This means that more electricity can be generated continuously than previously assumed. This is shown by a new study by Deutsche WindGuard, which was commissioned by the Federal Wind Energy Association (BWE) and the State Association of Renewable Energies NRW (LEE NRW).

The study 'Full load hours of wind turbines on land - development, influences, effects' describes in detail for the first time the effects of advances in wind energy technology on the actual generation volumes. It can thus serve as the basis for further calculations and potential assessments, reflecting milestones like UK wind surpassing coal in 2016 in broader analyses.

The results of the investigation show that the use of modern wind turbines with higher full load hours alone on the previously designated areas could double wind power generation to over 200 terawatt hours (TWh) by 2030. With an additional area designation, generation could even be increased to 500 TWh. If the electricity from offshore wind energy is added, the entire German electricity consumption from wind energy could theoretically be covered, and renewables recently outdelivered coal and nuclear in Germany as a sign of momentum: The current electricity consumption in Germany is currently a good 530 TWh, but will increase in the future.

Christian Mildenberger, Managing Director of LEE NRW: 'Wind can do much more: In the past 20 years, technology has made great leaps and bounds. Modern wind turbines produce around ten times as much electricity today as those built at the turn of the millennium. This must also be better reflected in potential studies by the federal and state governments. '

Wolfram Axthelm, BWE Managing Director: 'We need a new look at the existing areas and the repowering. Today in Germany not even one percent of the area is designated for wind energy inland. But even with this we could cover almost 40 percent of the electricity demand by 2030. If this area share were increased to only 2 percent of the federal area, it would be almost 100 percent of the electricity demand! Wind energy is indispensable for a CO2-neutral future. This requires a clever provision of space in all federal states. '

Dr. Dennis Kruse, Managing Director of Deutsche WindGuard: 'It turns out that the potential of onshore wind energy in Germany is still significantly underestimated. Modern wind turbines achieve a significantly higher number of full load hours than previously assumed. That means: The wind can be used more and more efficiently and deliver more income. '

On the areas already designated today, numerous older systems will be replaced by modern ones by 2030 (repowering). However, many old systems will still be in operation. According to Windguard's calculations, the remaining existing systems, together with around 12,500 new, modern wind systems, could generate 212 TWh in 2030. If the area backdrop were expanded from 0.9 percent today to 2 percent of the land area, around 500 TWh would be generated by inland wind, despite grid expansion challenges in Europe that shape deployment.

The ongoing technological development must also be taken into account. The manufacturers of wind turbines are currently working on a new class of turbines with an output of over seven megawatts that will be available in three to five years. According to calculations by the LEE NRW, by 2040 the same number of wind turbines as today could produce over 700 TWh of electricity inland. The electricity demand, which will increase in the future due to electromobility, heat pumps and the production of green hydrogen, can thus be completely covered by a combination of onshore wind, offshore wind, solar power, bioenergy, hydropower and geothermal energy, and a net-zero roadmap for Germany points to significant cost reductions.

 

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US renewable energy hit record 28% in April.

U.S. Renewable Energy Record 28% signals a cleaner power grid as wind, solar, and hydroelectric output soar; EIA data shows cost-competitive clean energy reshaping the electricity mix and reducing carbon emissions across regions.

 

Key Points

EIA-reported April share of electricity from wind, solar, and hydro, reflecting cost-driven growth in U.S. clean power.

✅ Wind, solar additions dominated recent U.S. capacity buildouts

✅ Lower levelized costs make renewables most competitive

✅ Seasonal factors and outages lowered fossil and nuclear output

 

The amount of electricity generated by renewable resources hit a record 28% in April, a breakthrough number that shows how important renewable energy has become in U.S. energy markets as it surpassed coal in 2022 overall.

"It's a 'Wow' moment," said Peter Kelly-Detwiler, an energy analyst and author of "The Energy Switch," a recent book about the transition to a carbon-free energy economy.

The percentage of U.S. electricity produced by renewable energy from wind, solar and hydroelectric dams has been steadily rising, from 8.6% in April 2001 to this April's 28%. Those numbers were released this week by the U.S. Energy Information Administration, which tracks energy data for the nation.

What explains the surge?
There are several reasons. At the top is that wind and solar installations dominated U.S. energy buildouts.

"Basically, the only things we've added to the grid in the past decade are wind, solar and natural gas," said Harrison Fell, an economist and engineer at Columbia University, where he co-leads the Power Sector and Renewables Research Initiative.

That's happening for two reasons. The first is cost. Renewables are simply the most economically competitive power currently available, Kelly-Detwiler said.

In 2021, the cost of producing a megawatt-hour of electricity from a new wind turbine was $26 to $50. The same amount of electricity from the cheapest type of natural gas plant ranged from $45 to $74, according to Lazard, a financial advisory firm that publishes annual estimates of the cost of producing electricity. 

Federal and state mandates and incentives to increase the amount of clean energy used also help, Fell said, as renewables reached 25.5% of U.S. electricity recently. 

"When you do the math on what's the most profitable thing to add, it's often going to be wind and solar at this stage," he said.

Was weather a factor?
Yes. April tends to be a particularly windy month, and this spring was windier than most, Fell said.

There's also less power coming into the grid from fossil fuels and nuclear in the spring. That's because electricity demand is generally lower because of the mild weather and fossil fuel and nuclear power plants use the time for maintenance and refueling, which reduces their production, he said.

Another surprise was that in April, wind and solar power together produced more electricity than nuclear plants nationwide. 

Historically, nuclear power plants, which are carbon-neutral, have reliably produced about 20% of America's electricity. In April that number dropped to 18% while wind and solar combined stood at 19.6%.

The nuclear decrease is partly a result of the shutdown of two plants in the past year, Indian Point in New York state and Palisades in Michigan, as well as scheduled closures for maintenance.

Will the trend continue?
When all U.S. carbon-neutral energy sources are added together – nuclear, wind, hydroelectric and solar – almost 46% of U.S. electricity in April came from sources that don't contribute greenhouse gases to the environment, federal data shows.  

"It's a milestone," Kelly-Detwiler said. "But in a few years, we'll look back and say, 'This was a nice steppingstone to the next 'Wow!' moment."

 

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BC Hydro electric vehicle fast charging site operational in Lillooet

BC Hydro Lillooet EV fast charging launches a pull-through, DC fast charger hub for electric trucks, trailers, and cars, delivering 50-kW clean hydroelectric power, range-topups, and network expansion across B.C. with reliable public charging.

 

Key Points

A dual 50-kW pull-through DC fast charging site in Lillooet supporting EV charging for larger trucks and trailers.

✅ Dual 50-kW units add ~50 km range in 10 minutes

✅ Pull-through bays fit trucks, trailers, and long-wheelbase EVs

✅ Part of BC Hydro network expansion across B.C.

 

A new BC Hydro electric vehicle fast charging site is now operational in Lillooet with a design that accommodates larger electric trucks and trailers.

'We are working to make it easier for drivers in B.C. to go electric and take advantage of B.C.'s clean, reliable hydroelectricity,' says Bruce Ralston, Minister of Energy, Mines and Low Carbon Innovation. 'Lillooet is a critical junction in BC Hydro's Electric Highway fast charging network and the unique design of this dual station will allow for efficient charging of larger vehicles.'

The Lillooet station opened in early March. It is in the parking lot at Old Mill Plaza at 155 Main Street and includes two 50-kilowatt charging units. Each unit can add 50 kilometres of driving to an average electric vehicle with BC Hydro's faster charging initiatives continuing to improve speeds, in about 10 minutes. The station is one of three in the province that can accommodate large trucks and trailers because of it's 'pull-through' design. The other two are in Powell River and Fraser Lake.

'As the primary fuel supplier for electric vehicles, we are building out more charging stations to ensure we can accommodate the volume and variety of electric vehicles that will be on B.C. roads in the coming years,' says Chris O'Riley, President and CEO of BC Hydro. 'BC Hydro will add 325 charging units to its network at 145 sites, and is piloting vehicle-to-grid technology to support grid flexibility within the next five years.'

Transportation accounts for about 40 per cent of greenhouse gas emissions in B.C. In September, BC Hydro revealed its Electrification Plan, with initiatives to encourage B.C. residents, businesses and industries to switch to hydroelectricity from fossil fuels to help reduce carbon emissions, alongside investments in clean hydrogen development to further decarbonize. The plan encourages switching from gas-powered cars to electric vehicles and is supported by provincial EV charger rebates for homes and workplaces.

BC Hydro's provincewide fast charging network currently includes, as part of B.C.'s expanding EV leadership across the province, 110 fast charging units at 76 sites in communities throughout B.C. The chargers are funded in a partnership with the Province of B.C. and Natural Resources Canada.

 

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American wind power congratulates President-elect Biden on his victory.

American Wind Power Statement on Biden highlights collaboration on renewable energy policy, clean energy jobs, carbon-free power, climate action, and a modern grid to grow the economy while keeping electricity costs low.

 

Key Points

AWEA commits to work with Biden on renewable policy, clean energy jobs, and a carbon-free U.S. grid.

✅ AWEA cites over 120,000 U.S. wind jobs ready to scale

✅ Supports 100% carbon-free power target by mid-century

✅ Aims to keep electricity costs low with renewable policy

 

American wind power congratulates President-elect Biden on his victory. "We look forward to collaborating with his administration and Congress, after pledges to scrap offshore wind in recent years, as we work together to shape a cleaner and more prosperous energy future for America, where wind and solar surpass coal in generation across the country.

The President-elect and his team have laid out an ambitious, comprehensive approach to energy policy that recognizes renewable energy's ability to grow America's economy and create a cleaner environment, as market majority for clean energy becomes a realistic prospect, while keeping electricity costs low and combating the threat of climate change as wind power surges across many regions.

The U.S. wind sector and its growing workforce of over 120,000 Americans stand ready to help put that plan into action and support the Biden administration in delivering on the immense promise of renewable energy to add well-paying jobs to the U.S. economy, with quarter-million wind jobs forecast in coming years, and reach the President-elect's 100% target for a carbon-free America by the middle of this century, alongside a 100% clean electricity by 2035 goal that charts the near-term path." - Tom Kiernan, CEO of the American Wind Energy Association.

 

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Electric Cars 101: How EV Motors Work, Tech Differences, and More

Electric Car Motors convert electricity to torque via rotor-stator magnetic fields, using AC/DC inverters, permanent magnets or induction designs; they power EV powertrains efficiently and enable regenerative braking for energy recovery and control.

 

Key Points

Electric car motors turn electrical energy into wheel torque using rotor-stator fields, inverters, and AC or DC control.

✅ AC induction, PMSM, BLDC, and reluctance architectures explained

✅ Inverters manage AC/DC, voltage, and motor speed via frequency

✅ Regenerative braking recovers energy and reduces wear

 

When was the last time you stopped to think about how electric cars actually work, especially if you're wondering whether to buy an electric car today? We superfans of the car biz have mostly developed a reasonable understanding of how combustion powertrains work. Most of us can visualize fuel and air entering a combustion chamber, exploding, pushing a piston down, and rotating a crankshaft that ultimately turns the wheels. We generally understand the differences between inline, flat, vee-shaped, and maybe even Wankel rotary combustion engines.

Mechanical engineering concepts such as these are comparatively easy to comprehend. But it's probably a fair bet to wager that only a minority of folks reading this can explain on a bar napkin exactly how invisible electrons turn a car's wheels or how a permanent-magnet motor differs from an AC induction one. Electrical engineering can seem like black magic and witchcraft to car nuts, so it's time to demystify this bold new world of electromobility, with the age of electric cars arriving ahead of schedule.

How Electric Cars Work: Motors
It has to do with magnetism and the natural interplay between electric fields and magnetic fields. When an electrical circuit closes allowing electrons to move along a wire, those moving electrons generate an electromagnetic field complete with a north and a south pole. When this happens in the presence of another magnetic field—either from a different batch of speeding electrons or from Wile E. Coyote's giant ACME horseshoe magnet, those opposite poles attract, and like poles repel each other.


 

Electric motors work by mounting one set of magnets or electromagnets to a shaft and another set to a housing surrounding that shaft. By periodically reversing the polarity (swapping the north and south poles) of one set of electromagnets, the motor leverages these attracting and repelling forces to rotate the shaft, thereby converting electricity into torque and ultimately turning the wheels, in a sector where the electric motor market is growing rapidly worldwide. Conversely—as in the case of regenerative braking—these magnetic/electromagnetic forces can transform motion back into electricity.

How Electric Cars Work: AC Or DC?
The electricity supplied to your home arrives as alternating current (AC), and bidirectional charging means EVs can power homes for days as needed, so-called because the north/south or plus/minus polarity of the power changes (alternates) 60 times per second. (That is, in the United States and other countries operating at 110 volts; countries with a 220-volt standard typically use 50-Hz AC.) Direct current (DC) is what goes into and comes out of the + and - poles of every battery. As noted above, motors require alternating current to spin. Without it, the electromagnetic force would simply lock their north and south poles together. It's the cycle of continually switching north and south that keeps a motor spinning.


 

Today's electric cars are designed to manage both AC and DC energy on board. The battery stores and dispenses DC current, but again, the motor needs AC. When recharging the battery, and with increasing grid coordination enabling flexibility, the energy comes into the onboard charger as AC current during Level 1 and Level 2 charging and as DC high-voltage current on Level 3 "fast chargers." Sophisticated power electronics (which we will not attempt to explain here) handle the multiple onboard AC/DC conversions while stepping the voltage up and down from 100 to 800 volts of charging power to battery/motor system voltages of 350-800 volts to the many vehicle lighting, infotainment, and chassis functions that require 12-48-volt DC electricity.

How Electric Cars Work: What Types Of Motors?
DC Motor (Brushed): Yes, we just said AC makes the motor go around, and these old-style motors that powered early EVs of the 1900s are no different. DC current from the battery is delivered to the rotor windings via spring-loaded "brushes" of carbon or lead that energize spinning contacts connected to wire windings. Every few degrees of rotation, the brushes energize a new set of contacts; this continually reverses the polarity of the electromagnet on the rotor as the motor shaft turns. (This ring of contacts is known as the commutator).

The housing surrounding the rotor's electromagnetic windings typically features permanent magnets. (A "series DC" or so-called "universal motor" may use an electromagnetic stator.) Advantages are low initial cost, high reliability, and ease of motor control. Varying the voltage regulates the motor's speed, while changing the current controls its torque. Disadvantages include a lower lifespan and the cost of maintaining the brushes and contacts. This motor is seldom used in transportation today, save for some Indian railway locomotives.

Brushless DC Motor (BLDC): The brushes and their maintenance are eliminated by moving the permanent magnets to the rotor, placing the electromagnets on the stator (housing), and using an external motor controller to alternately switch the various field windings from plus to minus, thereby generating the rotating magnetic field.

Advantages are a long lifespan, low maintenance, and high efficiency. Disadvantages are higher initial cost and more complicated motor speed controllers that typically require three Hall-effect sensors to get the stator-winding current phased correctly. That switching of the stator windings can result in "torque ripple"—periodic increases and decreases in the delivered torque. This type of motor is popular for smaller vehicles like electric bikes and scooters, and it's used in some ancillary automotive applications like electric power steering assist.


 

Permanent-Magnet Synchronous Motor (PMSM): Physically, the BLDC and PMSM motors look nearly identical. Both feature permanent magnets on the rotor and field windings in the stator. The key difference is that instead of using DC current and switching various windings on and off periodically to spin the permanent magnets, the PMSM functions on continuous sinusoidal AC current. This means it suffers no torque ripple and needs only one Hall-effect sensor to determine rotor speed and position, so it's more efficient and quieter.

The word "synchronous" indicates the rotor spins at the same speed as the magnetic field in the windings. Its big advantages are its power density and strong starting torque. A main disadvantage of any motor with spinning permanent magnets is that it creates "back electromotive force" (EMF) when not powered at speed, which causes drag and heat that can demagnetize the motor. This motor type also sees some duty in power steering and brake systems, but it has become the motor design of choice in most of today's battery electric and hybrid vehicles.


 

Note that most permanent-magnet motors of all kinds orient their north-south axis perpendicular to the output shaft. This generates "radial (magnetic) flux." A new class of "axial flux" motors orients the magnets' N-S axes parallel to the shaft, usually on pairs of discs sandwiching stationary stator windings in between. The compact, high-torque axial flux orientation of these so-called "pancake motors" can be applied to either BLDC or PMSM type motors.


 

AC Induction: For this motor, we toss out the permanent magnets on the rotor (and their increasingly scarce rare earth materials) and keep the AC current flowing through stator windings as in the PMSM motor above.

Standing in for the magnets is a concept Nikola Tesla patented in 1888: As AC current flows through various windings in the stator, the windings generate a rotating field of magnetic flux. As these magnetic lines pass through perpendicular windings on a rotor, they induce an electric current. This then generates another magnetic force that induces the rotor to turn. Because this force is only induced when the magnetic field lines cross the rotor windings, the rotor will experience no torque or force if it rotates at the same (synchronous) speed as the rotating magnetic field.

This means AC induction motors are inherently asynchronous. Rotor speed is controlled by varying the alternating current's frequency. At light loads, the inverter controlling the motor can reduce voltage to reduce magnetic losses and improve efficiency. Depowering an induction motor during cruising when it isn't needed eliminates the drag created by a permanent-magnet motor, while dual-motor EVs using PMSM motors on both axles must always power all motors. Peak efficiency may be slightly greater for BLDC or PMSM designs, but AC induction motors often achieve higher average efficiency. Another small trade-off is slightly lower starting torque than PMSM. The GM EV1 of the mid-1990s and most Teslas have employed AC Induction motors, despite skepticism about an EV revolution in some quarters.


 

Reluctance Motor: Think of "reluctance" as magnetic resistance: the degree to which an object opposes magnetic flux. A reluctance motor's stator features multiple electromagnet poles—concentrated windings that form highly localized north or south poles. In a switched reluctance motor (SRM), the rotor is made of soft magnetic material such as laminated silicon steel, with multiple projections designed to interact with the stator's poles. The various electromagnet poles are turned on and off in much the same way the field windings in a BLDC motor are. Using an unequal number of stator and rotor poles ensures some poles are aligned (for minimum reluctance), while others are directly in between opposite poles (maximum reluctance). Switching the stator polarity then pulls the rotor around at an asynchronous speed.


 

A synchronous reluctance motor (SynRM) doesn't rely on this imbalance in the rotor and stator poles. Rather, SynRM motors feature a more distributed winding fed with a sinusoidal AC current as in a PMSM design, with speed regulated by a variable-frequency drive, and an elaborately shaped rotor with voids shaped like magnetic flux lines to optimize reluctance.

The latest trend is to place small permanent magnets (often simpler ferrite ones) in some of these voids to take advantage of both magnetic and reluctance torque while minimizing cost and the back EMF (or counter-electromotive force) high-speed inefficiencies that permanent-magnet motors suffer.

Advantages include lower cost, simplicity, and high efficiency. Disadvantages can include noise and torque ripple (especially for switched reluctance motors). Toyota introduced an internal permanent-magnet synchronous reluctance motor (IPM SynRM) on the Prius, and Tesla now pairs one such motor with an AC induction motor on its Dual Motor models. Tesla also uses IPM SynRM as the single motor for its rear-drive models.


 

Electric motors may never sing like a small-block or a flat-plane crank Ferrari. But maybe, a decade or so from now, we'll regard the Tesla Plaid powertrain as fondly as we do those engines, even as industry leaders note that mainstream adoption faces hurdles, and every car lover will be able to describe in intimate detail what kind of motors it uses.
 

 

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