14000 rpm Machines

AC, DC, amps, volts and kilowatt. It's all discussed in here
User avatar
Richo
Senior Member
Posts: 3737
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

14000 rpm Machines

Post by Richo »

So here are some common sizes for stock industrial motors 4kW-11kW.
These are the ones that need to be replaced with high speed versions.

6305 25-ID 62-OD 17-W 11000RPM -> 6305P5 18500RPM
6306 30-ID 72-OD 19-W 9000RPM -> 6306P5 15000RPM
6307 35-ID 80-OD 21-W 8500RPM -> 6307P5 13200RPM
6308 40-ID 90-OD 23-W 7500RPM -> 6308P5 11700RPM
6309 45-ID 100-OD 25-W 6700RPM -> 6309P5 10500RPM


These seem to be faster versions:
http://www.alpinebearing.com/Scripts/XL ... &C=&SKIP=0
IF they are "better" is to be checked.
Last edited by Richo on Thu, 11 Jul 2013, 19:54, edited 1 time in total.
So the short answer is NO but the long answer is YES.
Help prevent road rage - get outta my way!
User avatar
Richo
Senior Member
Posts: 3737
Joined: Mon, 16 Jun 2008, 00:19
Real Name: Richard
Location: Perth, WA

14000 rpm Machines

Post by Richo »

My 4kW motor has 6306 so I could get 15,000RPM.
A retune would like this:
Image

Specs:
112kW peak @ 8700RPM
Reduction drive 8:1
Top speed 170kph@15,000 RPM after 60secs
0-100kph ~5secs (assuming I could keep traction)
I would rewind it to 70Vac to run from 400Vac under load.
or 35Vac to run from 200Vac.
or 17.5Vac to run from 100Vac (ie a 144V DC system -> 173V nom -> 197V charged)

This still is only 5.7x not the 10x you suggest.

I can still imagine the look on the rewinders face when I plonk a 400Vac 4kW motor on his desk and ask him to rewind it to 17Vac.
Oh and ask him to put "these" bearings in.
First words are likely to start with B and end with OFF.
Last edited by Richo on Thu, 11 Jul 2013, 21:10, edited 1 time in total.
So the short answer is NO but the long answer is YES.
Help prevent road rage - get outta my way!
antiscab
Senior Member
Posts: 2700
Joined: Mon, 26 Nov 2007, 05:39
Real Name: Matthew Lacey
Location: Perth, WA

14000 rpm Machines

Post by antiscab »

T2 wrote:
This next one may not be a popular suggestion but I believe that for EVs, electronic speed limiting should be in place at the previously mentioned 110km/Hr or 70mph for both range and battery longevity reasons. Aerodynamic losses being what they are sometimes EV drivers need to be saved from themselves !

*snip*

A 70mph top limit might also garner a reduction in insurance rates just for that reason and now I come to think about it risk of theft.


My Vectrix is speed limited to 70mph - its one of the limits I'm trying to get rid of (that and the motorcontroller current limit - 300A switching device, but peak bus current is only 225A?)

insurance on production EV's is already fairly cheap - my iMiev only costs $500/yr for comprehensive, and thats with a listed 22 yr old driver with 3 at fault claims in the past 4 years....

Matt
Matt
2017 Renault zoe - 25'000km
2007 vectrix - 156'000km
1998 prius - needs Batt
1999 Prius - needs batt
2000 prius - has 200 x headway 38120 cells
T2
Groupie
Posts: 121
Joined: Sat, 08 May 2010, 04:51
Location: ON,CANADA

14000 rpm Machines

Post by T2 »

300A switching device, but peak bus current is only 225A ?

-Matt but this device is mounted on an air cooled heat sink ?
Since I am not aware of your level of expertise in switchmode design, I would tentatively suggest that this 225 Amp limitation is to do with the ON state losses in the device.

Typically the ON state voltage characteristic against drain current for a 300A device would show an exponential lift off starting around 200A which would increase dissipation by 300% or more as 300A is approached. The heat sink is probably space optimised around this as it is more cost effective to install a larger device than necessary, which will tolerate a much reduced size heat sink and thus a more compact package.
T2
Post Reply