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Old 11-07-2011, 10:38 PM   #7 (permalink)
JasonG
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Join Date: May 2009
Location: Charlotte NC / York SC
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05 DMax - '05 Chevrolet 2500HD
90 day: 18.48 mpg (US)
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Quote:
Originally Posted by JRMichler View Post
A three phase motor will run just fine when single phased IF:
1) It's already up to speed AND
2) The load is less than 1/3 of nameplate power.
DCB's questions about torque and speed constraints lead me to think variable vehicle drive eliminating the above.
While they will run it does bad things to the windings. If they stop and go into "shudder" the burn out quickly.
We normally install phase monitors to shutdown the motor starter to prevent burning the motor up.

Chopping half the phase would reduce the torque but not the speed.
Frequency controlls speed in a 3 phase motor.

Maybe I am lost, isn't the E-tek a DC motor?

Per your schematic it is a 3 pole DC motor.

Your best and cheapest bet would be to use a 555 chip the fire the IGBTs from 0 to 100 percent.
If it is low enough amperage it will work fine, perhaps sized for a bicycle or scooter. No room or weight allowance for "Paul and Sabrina's cheap controller" type situation.
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I can't understand why my MPG's are so low..........
21,000lb, 41' Toy Haulers are rough on FE!
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