Quote from: mfred68 on April 22, 2008, 07:00:25 PM
are thows coils taken out of a couple of microwave transformers? they look very famillier

YES THEY ARE - GOOD SPOTTING.

Thane

Sorry if this has been asked before - what exactly is the difference between a 'high current' coil and a 'high voltage' coil?  Is it as simple as the the latter having more turns?

Hi All,

I'm posting this to save others wasting time. I tried my HV 205 ohms coil and 6 Lee Valley 1" magnets with and without cups on a ceiling fan induction motor. A ceiling fan induction motor is like a inverse version of the bench grinding induction motor that Thane uses. The shunted bar rotor is on the outside edge instead of in the middle. Using the low speed fan setting ( 27 watts at 605 rpm) there was no acceleration only slight declaration.

Hopefully, I,ll be getting a Ryobi bench grinder soon.

Regards,
Larry


   

Quote from: Super God on April 22, 2008, 09:08:30 PM
Sorry if this has been asked before - what exactly is the difference between a 'high current' coil and a 'high voltage' coil?  Is it as simple as the the latter having more turns?

LOTS MORE ON PAGE 43

YES OF COURSE FROM A BATTERY (SORT OF) OR MANY INDIVIDUCAL CAPACITORS

LET?S CONSIDER THE INDIVIDUAL COMPONENTS OF A HIGH CURRENT COIL:

HIGH INDUCED REACTION FORCE
LOW DC RESISTANCE
VERY LOW OR NEGLIGIBLE CAPACITIVE REACTANCE

NOW LET?S CONSIDER THE INDIVIDUAL COMPONENTS OF A HIGH VOLTAGE COIL

HIGH CAPACITIVE REACTANCE
HIGH DC RESISTANCE
VERY LOW OR NEGLIGIBLE INDUCED REACTION FORCE

CONSIDER A MAGNET APPROACHING A HIGH CURRENT COIL

WHEN A MAGNET APPROACHES A HIGH CURRENT COIL, THE COIL PRODUCES A LARGE REPELLING FIELD -(TRYING TO KEEP THE MAGNET FROM APPROACHING) BECAUSE A LOT OF CURRENT FLOWS IN THE COIL DUE TO THE LOW IMPEDENCE. 

WHEN THE MAGNET LEAVES THE COIL THE OPPOSITE OCCURS ? THE COIL THE CURRENT CHANGES DIRECTION AND THE COIL PRODUCES A HIGH ATTRACTING FIELD ? (TRYING TO KEEP THE MAGNET FROM MOVING AWAY) BECAUSE A LOT OF CURRENT FLOWS IN THE COIL.

CONSIDER A MAGNET APPROACHING A HIGH VOLTAGE COIL

NOW CONSIDER WHEN A MAGNET APPROACHES A HIGH VOLTAGE COIL VERY LITTLE CURRENT FLOWS BECAUSE OF THE HIGH IMPEDENCE IN THE COIL SO A VERY SMALL REPELLING FIELD IS PRODUCED ? THE MAGNET APPROACHES EASILY.

THE COIL BUILDS UP A CAPACITIVE CHARGE "slowly" AT THE RATE OF MAGNET APPROACH.

THE INSTANT THE MAGNET MOVES AWAY FROM THE COIL - THE COIL PRODUCES A CAPACITIVE DISCHARGE INSTANTLY THROUGH THE  COIL RESISTANCE AND THE MAGNETIC FIELD PRODUCED BY THE COIL'S CAPACITIVE DISCHARGE PUSHES AWAY THE RECEDING MAGNET WITH ADDITIONAL FORCE THUS ACCELERATING THE PRIME MOVER.

Thane

Quote from: LarryC on April 22, 2008, 10:34:06 PM
Hi All,

I'm posting this to save others wasting time. I tried my HV 205 ohms coil and 6 Lee Valley 1" magnets with and without cups on a ceiling fan induction motor. A ceiling fan induction motor is like a inverse version of the bench grinding induction motor that Thane uses. The shunted bar rotor is on the outside edge instead of in the middle. Using the low speed fan setting ( 27 watts at 605 rpm) there was no acceleration only slight declaration.

Hopefully, I,ll be getting a Ryobi bench grinder soon.

Regards,
Larry

DID YOU TRY A HIGHER SPEED?
WHAT WAS YOUR COIL OUTPUT VOLTAGE?
DO YOU HAVE PHOTOS?

Thane