Wind Turbine using 72vdc HPM5000B

[Leslie]

Alan,
Is it possible to use this for some crude regenerative braking that is missing on HPC100B ?
Dajs

It's possible to run the 3Phase motor with a simple controller similar to your
diode array (a simple three wire commutator would let you turn the wheel
at the same rate you turn the commutator.).
You would just be running it at maximum voltage/current when you do.

The problem is that just as the speed varies with the applied voltagein a motor,
the generated voltage varies with the applied windspeed on a windmill.

You still need a controller to regulate the load on the motor.

The easiest way to see this is to hook an electric
motor up on something with a crank of the drive, or if you have
an e-bike, turn it over and disconnect the motor from the speed controller.

When you turn the motor by hand with the circuit open (nothing connected) it turns
freely.

When you turn the motor with the wires shorted together (temporarily)
it is very hard to turn.   The work is going into making voltage and current
internally.

WARNING: DO NOT DRIVE THE MOTOR WITH THE WIRES SHORTED.  
Just turn it by hand.

The controller, in your case, regulates the voltage being generated so that
you can drive your collector at lower than maximum wind speed, but
can gather more power at higher speeds without burning out your charging circuits.

It should ideally keep your battery voltage at a certain level till the current
drops off, then stop generating when the battery bank is full.

Maybe make a Y splitter from generator to split to Bikemad's rectifier diodes and split to some TVS diodes rated at 14v zener and a low resistance high wattage load output, rated closely to the maximum output voltage of the residue zener voltage after the 14v drop, this could provide a good current path and add some automated control over the prop speed when zener breaks down.

[Leslie]

IMHO you would need more of the HPM-5000 motors in series to get the volts high enough at wind prop speed with no gears to charge A 12V sla and A VERY LARGE SLA at that. The HBS motors are better for this and use more HBS in parallel motors for the extra current as it's better topology to run separate generators with their own prop in parallel than in series unless you connects all generators shafts that are electrically connected in series to the single prop. Which all ends up all the same if the OP requires 5kw.  Still if a HBS can output 15 max amps this is pretty awesome and enough to charge a 80ah batttery in average wind conditions and a 150 ah battery in high wind conditions.

Power is all down to the prop area once you achieve the optimum RPM with load to project the high enough voltage and from the looks the HPM-5000 isnt up to the task without gears unless you run more in series.

The big question is does the OP really need 5kw power and if he does, using multiple HPM-5000 in series could work.

However 5 HBS 1000 watt motors in parallel spinning from a single prop could prove a much cheaper and more efficient path. 

From a single prop 5 HBS motors could be connected turned by a 1 to 1 gear linkage, or better, the housings could be bolted front to tail.  Anyway you look at it 5kw is a large heavy project.

If the OP wanted to use separate props per parallel connection with the HBS motor this would up the cost but could milk more power out of unpredictable gusts.  EG 5 wind turbines on 5 hbs motors in parallel connection to a single battery.

[Bikemad]

Is it possible to use this for some crude regenerative braking that is missing on HPC100B ?

Dajs.

It might work if switched in parallel with the speed controller during braking, but only when the motor is turning fast enough to produce a greater voltage then the main battery you're using to power it.

I was just able to get someone to help me spin my 72V motor.
The best I could read was this,
19.98 VAC at 2000 RPM

Unless I've got it completely wrong, it would have to spin faster than its maximum unloaded driven speed before it would start to actually generate and provide any resistance. (braking effect).
If you did manage to find a really long steep hill, you would probably need some form of regulator to prevent too much voltage/current being forced into the battery at really high revs.

A suitable speed controller with regen capabilities has got to be the best option for obtaining practical regen from this motor.

Alan
 

[Sr.WiNdTeCh]

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