14kw continuous 94% efficient motor.......

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liveforphysics   100 GW

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Re: 14kw continuous 94% efficient motor.......

Post by liveforphysics » Nov 04 2011 11:29am

circuit wrote:
recumpence wrote:Here are the specs;

Can length--- 4.5 inches
Can diameter--- 3.75 inches
Shaft diameter--- 1/2 inch (keyway shafts will be used)
Expected efficiency--- 94% (more on this later)
Continuous power--- 14kw
Burst power--- 25kw
Weight--- Under 7 pounds (expected)
[..]
Oh, I expect the sensorless motor to be $950
[..]

Matt
What's the Kv rating and inductivity of this motor?

Normally you can get your Astro motor in any KV you want, which would mean any resistance and inductance that you needed.
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circuit   100 kW

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Re: 14kw continuous 94% efficient motor.......

Post by circuit » Nov 04 2011 12:10pm

liveforphysics wrote:Normally you can get your Astro motor in any KV you want, which would mean any resistance and inductance that you needed.
Sorry, but I need an example with exact numbers - I can calculate inductivity for required Kv myself.
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johnrobholmes   1.21 GW

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Re: 14kw continuous 94% efficient motor.......

Post by johnrobholmes » Nov 04 2011 11:05pm

Mine is wound for 50kv, I found the following...
For future reference of Wye mode, the motor tests between 119.0 and 129.4 uH at 200khz frequency measured in natural rest. The windings are .138 ohm per phase measured with a Kelvin lead setup and 1 amp current driver. Maybe some of you smart fellows can calculate fancy things from that.

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circuit   100 kW

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Re: 14kw continuous 94% efficient motor.......

Post by circuit » Nov 06 2011 2:07pm

johnrobholmes wrote:Mine is wound for 50kv, I found the following...
For future reference of Wye mode, the motor tests between 119.0 and 129.4 uH at 200khz frequency measured in natural rest. The windings are .138 ohm per phase measured with a Kelvin lead setup and 1 amp current driver. Maybe some of you smart fellows can calculate fancy things from that.
Thanks. So, at Kv=150, the motor would be 15.3 mOhm and 13,9µH. Inductance at 150 Kv is so low, that no ebike/RC controller will work well.
At 60V this would be 9000 rpm. To get 14kW of input power, it will draw 233 Amps and it will make 832W of heat in the motor. How are you going to dissipate that?

My second concern is... Why would one consider lowering Kv? Sure, you will need less reduction, but you will lose power as well. For example, the same motor, wound for 2x lower Kv, will produce 4x less power. Even if you increase battery voltage to get the same RPM, you will get 2x less power from the same motor. This is because series resistance of the motor increase is a square of Kv decrease.
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Miles   100 GW

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Re: 14kw continuous 94% efficient motor.......

Post by Miles » Nov 06 2011 2:17pm

circuit wrote:This is because series resistance of the motor increase is a square of Kv decrease.
and losses are proportional to the square of the current.....

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Re: 14kw continuous 94% efficient motor.......

Post by circuit » Nov 06 2011 2:37pm

If you will have a fixed current limit, your motor will burn.
Limiting factor is power dissipated in windings.
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Miles   100 GW

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Re: 14kw continuous 94% efficient motor.......

Post by Miles » Nov 06 2011 2:44pm

circuit wrote:Limiting factor is power dissipated in windings.
Which is the same whatever combination of volts and amps you use to get the same speed and torque. Kt = 1/Kv

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Re: 14kw continuous 94% efficient motor.......

Post by johnrobholmes » Nov 06 2011 6:24pm

I didn't purchase my motor for 14kw use, I purchased it for long hauls that would heat soak everything else I have.

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Re: 14kw continuous 94% efficient motor.......

Post by Bjorntsc » Aug 16 2012 9:56pm

I really want your motor for my project.
Is there still one available? If so how much?

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jussumguy   100 mW

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Re: 14kw continuous 94% efficient motor.......

Post by jussumguy » Aug 16 2012 10:10pm

So... $750.00?

-

VoKuS   100 W

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Re: 14kw continuous 94% efficient motor.......

Post by VoKuS » Aug 20 2012 11:20pm

So?

Is this motor for sale or in production?

Can we have an ETA?
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Bjorntsc   100 mW

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Re: 14kw continuous 94% efficient motor.......

Post by Bjorntsc » Aug 28 2012 9:14pm

Ready to buy, send me a pm...

kamdenburke   100 µW

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Re: 14kw continuous 94% efficient motor.......

Post by kamdenburke » Jun 25 2015 1:53am

What's the deal with this motor?

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Thud   100 MW

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Re: 14kw continuous 94% efficient motor.......

Post by Thud » Jun 25 2015 4:43am

Buy one here:
http://www.astroflight.com/4535

Better grab a controller for it while your at it:
http://www.astroflight.com/esc-2413
get some......

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recumpence   100 GW

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Re: 14kw continuous 94% efficient motor.......

Post by recumpence » Jun 25 2015 6:48am

Actually that controller is not available.

There is a controller I have been testing that looks compatible with the 3230 I made at the beginning of this thread. So, I am back into some dressing work and discussion with Astro about the bigger 3230. It is not the 45 series motor astro lists on their site. This is a 50% longer than stock 3220 (making it a 3230). The price will be far cheaper than the 4535 they make.

It will be another 6 months or so before I am back on the development of it.

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macribs   1 GW

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Re: 14kw continuous 94% efficient motor.......

Post by macribs » Jun 26 2015 9:05am

Subscribed.

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macribs   1 GW

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Re: 14kw continuous 94% efficient motor.......

Post by macribs » Jul 17 2015 5:40pm

From glancing thru this thread it seems your problems was due to controllers and sensors. But his was 5 years ago.
What are available today? That monster controller from Astro is it discontinued? Still shows up on their website. How do Astro plan to run their 4" long canned motor without the monster controller?

Anyway alienpower got ESC 450A 24s. They even do custom ESC to your likings. Maybe that can work? I guess sensored it setup will not work, as typical EV controllers do not let you harvest 20.000+ rpms. Is there other controllers that might work like Lebowski? I would really like to see this motor getting the wind back in the sail. Motor seems like the perfect candidate for many light weight setups.

Did you ever do any tests with water cooling of this motor?

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Re: 14kw continuous 94% efficient motor.......

Post by aCeMadMod » Oct 05 2016 9:28am

any have one the motor letf any working, They sould make a mosters Vesc it could save the day,


if can run 3220 sould be able to power this one


if you have one to sell i buy it, 8)

it now 6 year ago

rjwilson18   1 µW

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Re: 14kw continuous 94% efficient motor.......

Post by rjwilson18 » Nov 01 2016 9:14pm

What kind of full suspension fat bike would handle this monster? :shock:

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mr.electric   10 kW

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Re: 14kw continuous 94% efficient motor.......

Post by mr.electric » Mar 18 2018 2:01am

what happened to this motor?
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Re: 14kw continuous 94% efficient motor.......

Post by johnrobholmes » Apr 10 2018 8:59am

Astro got bought out and it put a damper on this project. Best I understand, the new owners are rather unwilling to do "custom" work and also increased prices dramatically on Matt.

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recumpence   100 GW

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Re: 14kw continuous 94% efficient motor.......

Post by recumpence » Apr 12 2018 6:00pm

That's pretty much the case.

There were many factors at play;

The company buyout of Astro
High production cost
No suitable controller to run it
Etc

Matt
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Re: 14kw continuous 94% efficient motor.......

Post by Arlo1 » Apr 12 2018 11:33pm

recumpence wrote:
Apr 12 2018 6:00pm
That's pretty much the case.

There were many factors at play;

The company buyout of Astro
High production cost
No suitable controller to run it
Etc

Matt
Was it Alta motors?
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recumpence   100 GW

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Re: 14kw continuous 94% efficient motor.......

Post by recumpence » Apr 13 2018 8:35am

Nope Astro Flight
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Re: 14kw continuous 94% efficient motor.......

Post by aCeMadMod » Apr 13 2018 10:44am

hi from what I know , they 3 motors made 1 died were the other 2 go ? are they sill alive mat

thank you 8)

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