[major]

Originally Posted by DavidDymaxion

So it looks like they are winning for output power, too!

David,

That would be torque. The whole point of the thread http://www.diyelectriccar.com/forums...nti-36904.html

But we don't need to start into that here. However, from what I've seen, I seriously doubt that a Kostov 9 or 11 inch would have greater power output than the motor in the Tesla, let's say qualified for 10 seconds or longer.

And you mention 50 kW continuous for the ACP. That is output power. Show me a DC motor with that high of a continuous rating which will fit into a car, let alone of similar size to the ACP.

Regards,

major

[JRP3]

Let's also remember, ACP does not = Tesla. Tesla has changed and improved the ACP design. Lighter motor, higher output, and no longer uses the motor and controller for charging.

[ubergeek63]

Originally Posted by ZX-E

Sorry, but I don't see how I was neglecting any of those things. I just want to know if there's a DC motor that can compare to it. Simple as that.

See my link... there are many that do the difference is not a special motor but a special controller. ANY 12 wire 60/60Hz 3PH 30HP AC motor wired for low voltage operation operated at high frequency and high voltage will perform similarly, though you do want a premium efficient type to start with.

But to answer your question, it is an effect of the AC nature that allows this to work so there is no way to make a DC motor do this even with rare earth magnets.

Dan

[ubergeek63]

Originally Posted by tomofreno

Yes, but it is nonetheless required if you want to accelerate as in appears crodriver does. As JRP3 points out that combination of weight and peak power is unusual.

Not a problem at all. Did ANYONE read the PDF at the link I posted?

Minor motor modifications and major controller modifications get large peak power increases such that the AC motor horse power rating can be sized for the continuous duty, IE cruising requirements instead of the peak requirements that you need to size a IC engine for.

Dan

[major]

Originally Posted by ubergeek63

Not a problem at all. Did ANYONE read the PDF at the link I posted?

Yeah, Dan, I read it. Interesting. All they are doing is changing the design voltage of the windings by coil connection. When was the last time you were able to buy a 30 hp motor rated for 120 Vac or 60 Vac? Minor modifications the manufacturer should do for you, I think is what the paper said. You want to bet?

Even changing the winding, you'll fall way short of the Tesla (or ACP) motor. If was that easy, you'd think there would be some competition for those guys. Love to see you do it. Go ahead, make my day.

Regards,

major

[JRP3]

Mine too

[Electric Car-Nut]

Originally Posted by Wirecutter

Thanks for that, major. Great laugh. I've seen that number before, too, but when you put it that way, it really does sound ridiculous.

A coworker once ran the numbers on an EV with 200+ mile range and a 5 minute (or similarly very short) recharge time. Using conservative estimates for vehicle weight, it turned out that it took an incredible amount of power draw to acheive the stated recharge time, simply by virtue of replacing enough energy to move a car 200 miles in such a short time. (edit: Tesla -> 53kWh battery. To replace that 53kWh (or 3.18 megawatt-minutes) of energy in 5 minutes takes a 636kW draw, assuming everything's 100% efficient, which it's not. My house has 200A service, which at 220v works out to 44kW.)

It reminds me of the stereo maker back in the '70s that rated their stuff in "Maximum Music Power" and gave insane numbers for wattage. They got this number by putting the amplifier on a perfect power supply, driving a half cycle spike through it, then claiming that this instantaneous power was the fabled "MMP".



-Mark

Friends of mine who drive locomotives for CSX have told me that they run 5,000 hp with the 8 wheel locos and 7,000 hp with the 12 wheel locos, but I never asked how many motors were driving the wheels, might be one for each wheel...

[ubergeek63]

Originally Posted by major

Yeah, Dan, I read it. Interesting. All they are doing is changing the design voltage of the windings by coil connection. When was the last time you were able to buy a 30 hp motor rated for 120 Vac or 60 Vac? Minor modifications the manufacturer should do for you, I think is what the paper said. You want to bet?

Even changing the winding, you'll fall way short of the Tesla (or ACP) motor. If was that easy, you'd think there would be some competition for those guys. Love to see you do it. Go ahead, make my day.

Regards,

major

sorry i was snooping for a while as well as working on things. Actually they are talking about taking a 230/460V motor and wiring the phases in parallel

Gonna keep trying to look a mfg to see if they have a 12 wire motor.

Dan

[major]

Originally Posted by ubergeek63

Actually they are talking about taking a 230/460V motor and wiring the phases in parallel

Dan,

From your source:

we began with a motor that had been factory configured for a dual 115 V/ 230 V 60 Hz rating

Show me where to get a 115V 3 phase 30 HP induction motor.

Regards,

major

[ubergeek63]

Originally Posted by major

Dan,

From your source:

Show me where to get a 115V 3 phase 30 HP induction motor.

Regards,

major

And the very next sentence is:

(a low-cost modification of winding taps compared to the
catalog 230 V/ 460 V connections)

Or, in other words, "readily doable but not stock".

Dan