UQM Technologies Introduces PowerPhase HD 250


UQM Technologies announced the introduction of its most powerful electric drive PowerPhase HD 250 that consists of a permanent magnet motor/generator and a full-featured digital signal processor (DSP) based controller.

This is a heavy-duty drive unit for high-voltage applications of 450-750 volts that complements the earlier PowerPhase HD 220 and PowerPhase HD 950T.

PowerPhase HD 250 provides 900 Nm (664 lb-ft) peak torque and 250 kW of peak power.

UQM Technologies PowerPhase HD 250

UQM Technologies PowerPhase HD 250

Eric R. Ridenour, President and Chief Executive Officer of UQM Technologies, Inc. stated:

“UQM is addressing market needs by developing a comprehensive range of systems for our domestic and global customers. The PowerPhase HD 250 provides an ideal solution for trucks and buses that are designed to operate at voltages between 450 and 750 volts. Commercial vehicle systems are a significant part of our business, and this new system further expands our opportunities within this segment.”

According to Jon F. Lutz, Vice President of Engineering of UQM Technologies higher voltage brings much better performances, with up to 95 percent energy conversion efficiency:

“Higher operating voltage creates lower operating current, enabling lower weight or lower resistance losses in vehicle wiring, and this is an architecture choice for some manufacturers’ electrified vehicles.”

Category: General


18 responses to "UQM Technologies Introduces PowerPhase HD 250"
  1. Warren says:

    At 750 volts, they had better hope the insulation never breaks down on any of the wiring. You could be lighting up people across the parking lot. 🙂

    1. Priusmaniac says:

      We are talking 750 volt here, not 750000 volt, which is a huge difference. 750 Volt hardly takes more insulation than 400 volt. Actually it takes 1000 volt to make a 1 mm jump trough air so at 750 volt you are pretty safe. If you take care of adequate separation between the poles of at least 2 cm you are 2000 % safe which is way higher than the aviation safety factors for instance. If you used the same factors you would end up with only 2 mm between the poles.
      In reverse, if you keep the 2 cm distance that same aviation safety level would allow 10000 volts. This mean a supercharger of 400 Volt and 90 KW could be boosted up at 10000 volt and over 2250 KW, enough to recharge in 3 minutes (if the 18650 cells can follow of course, which would for sure be special 18650 cells).

    2. Aaron says:

      As stated by Mr. Lutz (something about the name?), as voltage goes up, the amount of current needed for the same power drops. Fat wires are needed to feed your booming car stereo amp because it’s only 12 volts. If those amplifiers would run at higher voltages, the wires needed to power them could be thinner.

  2. Evil says:

    Gas can fire up anyone and all things around 8))). The power always dangerous in any of his state….

  3. Bill Howland says:

    no pricing or efficiency information.

    1. Bill Howland says:

      I should amplify what I mean. 95% conversion efficiency of the inverter, but what is the efficiency of the motor? It can’t be superefficient since if it was it wouldn’t need to be liquid cooled. But the distance between the motor and the inverter is of no concern at these voltages as far as voltage drop goes. Its percentage wise infintesimal.

      1. HVACman says:

        At 250 kW input, even a 98% efficient motor (hella-efficient) will have to dissipate 5 kW of heat. That’s a lot of heat in a small package that can be buried in a tight space. Direct air-cooling is not viable – it’s both more efficient and flexible for the vehicle motor placement to dissipate the heat via liquid cooling to a radiator as opposed to trying to achieve some sort of cooling air scheme with fins, fans, etc.

        Similarly Compare HP and efficiency of liquid-cooled motorcycle engines vs air-cooled, or the old VW engines vs conventional liquid-cooled engines.

  4. Bill Howland says:

    “…..Higher voltages causes….. Lower resistance losses, …….and is the architecture of choice for vehicle manufactures….”.

    Really? It also increases leakage and switching losses. 750 volts is so compelling that ViaMotors apparently switched from 650 volts to 300 !!!!

    1. Aaron says:

      It’s much easier to get batteries to run at lower voltages. The physics stands: Higher voltages can travel through thinner wires.

  5. Evil says:

    higher voltage means less current with same power. so, its dangeruos but weight less. Your american 110v network required 2x more cuprum then our 220v 8)

    1. Aaron says:

      Which is more dangerous? 110V at 8 amps or 220V at 4 amps? The answer is simple: They’re the same.

      1. ModernMarvelFan says:


        Are they Voltage source or Current source?

  6. Dan Frederiksen says:

    Do they want to sell it? no
    Do they want to sell it for a price that’s anywhere near workable for a commercial product? no.

    They can go die in an alley.

    1. Aaron says:

      Why don’t they want to sell it? Have you inquired about their product? I know you’re all about home-built EVs, but we’re not all doing that. Most of us buy pre-manufactured EVs.

      1. Dan Frederiksen says:

        I’m sure I have tried a few years back and no doubt Jack Rickard has too. It’s very common among a lot of businesses, they don’t want to talk to you or they will give you the 25k$ price. If you are lucky.
        ACpropulsion does the same. Even though their product is bizarrely overpriced they will genuinely refuse to sell it to you. At 25k$. Jack Rickard has that kind of money and he actually tried to buy it. No dice.
        How they stay in business is an effing mystery. Both ACP and UQM. A123 does the same and they couldn’t stay in business. Not that they learned anything from it. The same nitwit policy applies. You can get the shaft price (4x normal price) or you can get nothing. It doesn’t matter that you are a startup company producing electric cars. If you are not a billion dollar company they wont deal with you. They sell to DeWalt and now a tiny bit to GM. That’s about it. Never mind that there are hundreds of millions of dollars annual sales wanting to buy their product, no can do.
        And I have communicated with A123 quite a bit trying to hammer through their thick skulls that they should actually sell their product but nooo.. I even contacted wanxiang if they knew about this policy and at first they reacted that of course that’s not acceptable, I’ll have a word with them but it petered out… The policy remains. Unlimited stupidity.
        Wanxiang CEO convinced himself that ii’s just because I want it cheaper than they are selling it which isn’t the case. I’d be very happy with the price DeWalt and GM pays. But A123 want 1100$/kWh on their shaft hobby site.

        I could say I want to buy 100000 cells and they couldn’t be bothered.

        You may have heard that even Elon Musk have had trouble with companies trying to buy their product. There is such gargantuan stupidity in the business world. It’s almost like the Pretty Woman snob shop scene. If you are not a billion dollar company then you are ugly. Never mind someone becoming a billion dollar company, that’s not interesting.

        1. Dan Frederiksen says:

          Btw, the implicit irony which Jack Rickard has also correctly identified is that when dealing with really huge companies you get squeezed hard on the price. So your volume might be big per customer but the profit margin might be negative.

  7. Dr. Kenneth Noisewater says:

    One of these at each corner (sprung, with short shafts) would be pretty damn sweet..

    1. ModernMarvelFan says:

      That would take a lot of “juices” to run one of those….