150W PMG

[frepdx]

Is anyone familiar with this alternator?

craigslist add here

Specifications:

Permanent Magnet synchronous AC device with a 3-phase full wave diode bridge for rectification to DC. Also referred to as BLDA or brushless DC. The device outputs in DC power. 150 W suggested max power output. Manufacturer unknown. Made in South Korea.

Size: 7" diameter x 1" tall

Mass: 2kg (4.5 lbs)

Torque net output coefficient: 1.7 Nm/A (1.2 ft-lb/A)

Internal Resistance: 11 ohms/leg and is "Y" wound.

Net Output Resistance: 22 ohms

Max Power: ~ 150W dc

Output Voltage: 0-50V dc

[ghurd]

Strange device.

The 3.9A at 57V to start with.

Then peaks out at 250W at 500RPM.

At 150W output, the coils are dissipating 335W of heat.  Not very efficient, 31%?

Seems like anything that slow, with a limited amount of power, would not be the best choice when trying to match the balance of a windmill.

I can't think of anything it would be very suited to.

Maybe the large version of the HF garden mill blades?

G-