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Hi Gents,
here is a nice datasheet of a VSR motor, that is almost unbelievable to me:

/snip
Model No. HP Peak HP Cont. Peak Torque(NM) Max speed Shaft OD(mm) Weight (kg)

RA215L 24.0 11.3 21.2(28.8) 15,000 1.1(24) 70lbs(32)

/snip
It only needs a controller with 4 silicone PWM-devices instead of a 3~ H-bridge and beside that, it behaves like a AC-IM ( including regen ).
If these are 'industrial rated' specs, I wonder how much more these leightweight motors could deliver. Especially max. Torque is a bit low.

-Olaf
BTW, this is not a new concept, they already built these motors up to 5MW size :D
 

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Hi Gents,
here is a nice datasheet of a VSR motor...
Interesting, thanks.

Especially max. Torque is a bit low.
Err, not really, for a 24 HP (peak) motor. The 24 HP (18 kW) of peak power
is at 6000 RPM. 28.8 Nm of torque * 100 rps (=6000 RPM) * 2 * pi ~= 18,100 W.

You just gear this motor down for more torque.

I wonder how the torque declines at higher speeds like the 15,000 RPM
maximum.

 

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Interesting, thanks.

Err, not really, for a 24 HP (peak) motor. The 24 HP (18 kW) of peak power is at 6000 RPM. 28.8 Nm of torque * 100 rps (=6000 RPM) * 2 * pi ~= 18,100 W.

You just gear this motor down for more torque.

I wonder how the torque declines at higher speeds like the 15,000 RPM
maximum.

dawid posted links on voltage reduction in OZ I think, 12x power increases at high eff. on induction 1800 rpm 1/3 hp to 6000 & 4.7 hp using v/f control . no reason this would not work better with sr motor . this is the highest performance potential , saw one (link disapeared) 150 lbs, 20krpm, racing app. 750 con hp .(5 hp/lbs.) LTI says best start up torque of anything (no roter heating ) .check my posts in electric motors and controllers for some links . the links have more links. a days worth of reading.
 
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