Thane Heins Perepiteia.

[aether22]

I AM GOING TO MONITOR THE ROTOR RPM AND THE MOTOR RPM ON A COUPLE OF DIGITAL TACHS ON THE DASHBOARD - THERE WILL BE A BELT ON THE MOTOR WHICH I WILL MANUALLY ENGAGE THE ROTOR WITH A LEVER WHEN THE TACH #'S ARE CLOSE ENOUGH NOT TO BURN MY BELT.

GET THE TIMING RIGHT AND I WON'T EVEN NOTICE THE TRANSITION.

Thane

Sounds good, maybe then combining what you said and what I said (gears), add in a small level of throttle control that varies the speed of the motor within a highly efficient zone, so the throttle makes up for the difference between the gears.

I don't know how much loss a standard manual transmission introduces but I feel it would be less than running the induction motor at an inefficient speed. (especially when starting they are very poor as everyone on here knows)

The only other way to go that I am aware of is to vary the frequency input, but I am not sure just how that would work, can just putting in a different voltage make stator coils efficient at a frequency that is a fraction of the design frequency.

Of course if you have this all worked out and I am just annoying you please ignore.

[CRANKYpants]

SORRY DUDE - PM DC MOTOR - GOOD TO UP TO 55 MPH w/ 2 PEOPLE.
AND NO GEARS ETC. FOLLOWING THE KISS RULE    .

Thane

[OUman]

... i can't begin to guess just how doing gears and clutch for such a situation would work, unless the gears were infinitely variable. (such gear do exist but no idea how practical they are for vehicles)

Continuously variable gearboxes are quite straighforward and they are certainly applicable to vehicles - they were used in cars by a European company called DAF, which was later sold to Volvo who used it on certain of their models. My Massey garden tractor has one too - they all work by way of moving a drive belt back and forth along a conical pulley.

Electric motors don't need a gearbox though - they drive the wheels at a fixed ratio. I think introducing a gearbox into an electric vehicle would be a big step backwards and negate one of their many advantages.

[CRANKYpants]

OK OUman - I AM GOING TO BITE (I JUST KNOW I AM GOING TO HATE MYSELF IN THE MORNING THOUGH).

CAN YOU PLEASE EXPLAIN THE ACCELERATION OF A 10 LB MASS FROM 400 RPM TO 1500 RPM - WITH NO ADDITIONAL ENERGY SUPPLIED FROM THE PERSPECTIVE OF THE WORK ENERGY PRINCIPLE - ROTATIONAL KINETIC ENERGY.

FOR ANYONE ELSE HERE IS A HINT:
http://hyperphysics.phy-astr.gsu.edu/hbase/rotwe.html#we

AND

http://hyperphysics.phy-astr.gsu.edu/hbase/work.html

THE RULES - NO ADDITIONAL ENERGY SUPPLIED FROM ANY "KNOW" SOURCE.

OK GO!

LOVE
Thane

[CRANKYpants]

A22 - IS IT JUST ME OR IS THERE A TEAM OF "OUmen" SOMEWHERE RUNNING AROUND GOOGLING LIKE CRAZY IN SOME OFFICE, ALL WEARING BLACK SUITS (LIKE THE MATRIX) ALL DEDICATED TO THIS THREAD 24/7?

CHANTING...

"Nothing ever gets done
unless it's done by a fanatic."
Martin Sheen

Thane