hello Thane

If i read you right, can i understand that you let the system (as it is in your last video) accelerate up to 3600 rpm and perhaps more?

cheers

Laurent

Quote from: CRANKYpants on January 22, 2009, 07:47:17 PM
THIS IS A GOOD IDEA BUT WHY DOES THE "MOTOR HAVE TO BE MOVED OUT OF THE EQUATION"?

ISN'T IT SAFE TO SAY THAT AS THE MOTOR ACCELERATES IT IS MOVING ITSELF OUT OF THE EQUATION - APPROACHING FULL SPEED @ 3600 RPM WHERE SLIP ANGE = 0 DEGREES AND THE STATOR CURRENT IS APPROACHING 0.

NOW COMPARE THIS WITH THE GENERTAOR'S HC COIL WHICH IS INCREASINGLY IMPOSING ITSELF AGAINST THE ROTOR.

NOTE:

CONVENTIONAL HC MODE - 0.1 WATT CAUSES DECELERATION

PEREPITEIA HV MODE - HC + HV COILS - 21 WATTS CAUSES ACCELERATION WHILE AT THE SAME TIME THE MOTOR HAS REMOVED ITSELF TO THE TUNE OF 104 WATTS.

WE ARE PLANNING TO EMPLOY A CLUTCH FOR THE ROTOR IN THE X PRIZE CAR SO THAT THE ROTOR IS FREE-WHEELING EVEN WHEN THE CAR IS SITTING AT A STOPLIGHT.

CHEERS
Thane

Perhaps a bad choice of phrasing. The motor introduces drag upon the system once the HV coil is shorted so removing it from the system by way of a clutch should cause the rotor to spin up even faster. Less drag & faster spin = improvement.

Quote from: samedsoft on January 23, 2009, 02:14:45 AM
Dear Thane,

  Why don't you just put 5 coils on one side and another 5 coils other side of the rotor and then try to see how much torque is being gained?

  Nuri Temurlenk
  God bless humanity..

ACTUALLY WE ARE PLANNING 6 COILS PER SIDE.

T

Quote from: woopy on January 23, 2009, 03:28:13 AM
hello Thane

If i read you right, can i understand that you let the system (as it is in your last video) accelerate up to 3600 rpm and perhaps more?
cheers
Laurent

NO - I AM TOO CHICKEN.
THE HIGHEST WAS 21 WATTS OUT BUT IT WAS NOT FULL SPEED (AND IT IS NOT WHAT WE WANT TO SHOW AT THIS POINT EITHER ANYWAY).

BECAUSE

0.1 WATT W/ DECELERATION @ 75 VOLTS & 255 WATTS & > 1000 RPM

COMPARED TO

21 WATTS W/ ACCELERATION @ 75 VOLTS & 135 WATTS

REPRESENTS A:

20900% OUTPUT GAIN WITH A 47% INPUT REDUCTION & < 3200 RPM

I WOULD BE AMAZED IF IT CAN GO ABOVE 3600 RPM WITHOUT INCREASING THE LINE FREQUENCY - BUT WE WILL HAVE TO WAIT UNTIL WE GET I_RON'S REINFORCED ROTOR BACK FROM CALIFORNIA.

ALSO IT SHOULD BE NOTED THAT:
FROM 1000 RPM OR SO TO ABOVE OR NEAR 3500 RPM - THE INPUT POWER IS DECREASING (WHEN IT OUGHT TO BE INCREASING IN TANDEM WITH THE OUTPUT).

WE STILL HAVE NOT ACCOUNTED FOR THE WATTS/HOUR WHILE THE FLYWHEEL IS DECELERATING BACK DOWN TO 1000 RPM - AND THEN AGAIN WHEN THE REGENERATIVE BRAKING MODE KICKS IN BELOW THE MINIMUM THRESHOLD SPEED.

T

Quote from: hydrocontrol on January 23, 2009, 03:49:11 AM
Perhaps a bad choice of phrasing. The motor introduces drag upon the system once the HV coil is shorted so removing it from the system by way of a clutch should cause the rotor to spin up even faster. Less drag & faster spin = improvement.

I WOULDN'T DISCOUNT THE MOTOR TOO SOON...

IN OUR ELECTRIC CAR APPLICATION WE ARE GOING TO TRY TO REDUCE THE VOLTAGE TO THE 3 PHASE AC INDUCTION MOTOR BUT RAISE THE STATOR FREQUENCY. DO YOU FOLLOW ME?

THE MOTOR'S ROTOR WILL BE AIDED BY THE HV COILS AND ALSO TRY TO AGIGN ITSELF WITH THE STATOR FREQUENCY. THE COST OF INCREASING THE STATOR FREQUENCY WILL BE MINIMAL.

YES WE DO INTEND TO EMPLOY A CLUTCH ALSO - BUT WE ALSO WANT A GOOD FLYWHEEL EFFECT SO TO MOTOR'S ROTOR INERTIA MAY BE IMPORTANT HERE AS WELL - WE MAY END UP HAVING TWO CLUTCHES.

1 TO DISENGAGE THE MOTOR FROM THE DRIVETRAIN
AND
1 TO DISENGAGE THE MOTOR FROM THE ROTOR.

THIS ENTIRE PROJECT STARTED AS A UPS - FLYWHEEL ENERGY STORAGE SYSTEM. http://en.wikipedia.org/wiki/Flywheel_energy_storage
SO WE WILL TRY TO EMPLOY AS MUCH OF THAT TECHNOLOGY AS POSSIBLE.

CHEERS
T