48v motor make a good 48v generator? 
by pengyou » Sat Jul 31, 2010 6:13 am
by pengyou » Sat Jul 31, 2010 6:13 am Will a 48v motor make a good 48v generator? Put another way, I am trying to find a 48v generator withing using inverters and adapters. Will a motor be efficient? They are a lot lighter than auto alternators.
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Re: 48v motor make a good 48v generator?
by olaf-lampe » Sat Jul 31, 2010 1:41 pm A 48V motor can act as a 48 V generator with the right controller. Infineons for instance can be programmed to a certain regen-voltage. The amount of charge current depends on how fast the motor spins.
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Re: 48v motor make a good 48v generator?
by Jeremy Harris » Sat Jul 31, 2010 2:33 pm The voltage output of a permanent magnet motor used as a generator depends on four factors; the Kv (the rpm per volt) for the motor, the motor/generator shaft rpm, the winding resistance of the motor/generator and the current being drawn by the load.
You also need to factor in the difference between the rms (root mean square) voltage from the motor/generator AC waveform and the DC voltage that you will get after rectification.
Here's a worked example for a typical permanent magnet motor:
Kv = 200
rpm = =5000
winding resistance = 0.01 ohms
Current = 20 amps
At 5000 rpm this motor will generate 5000 / 200 = 25 volts with no load. With a load of 20 amps and an internal winding resistance of 0.01 ohms the motor will deliver a terminal voltage of 25 - (20 x 0.01) = 24.8 volts.
Using the above calculations you can work out the voltage you will get from any particular permanent magnet motor when used as a generator at any particular rpm and load.
Jeremy
You also need to factor in the difference between the rms (root mean square) voltage from the motor/generator AC waveform and the DC voltage that you will get after rectification.
Here's a worked example for a typical permanent magnet motor:
Kv = 200
rpm = =5000
winding resistance = 0.01 ohms
Current = 20 amps
At 5000 rpm this motor will generate 5000 / 200 = 25 volts with no load. With a load of 20 amps and an internal winding resistance of 0.01 ohms the motor will deliver a terminal voltage of 25 - (20 x 0.01) = 24.8 volts.
Using the above calculations you can work out the voltage you will get from any particular permanent magnet motor when used as a generator at any particular rpm and load.
Jeremy
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