Neo-Aerodynamic

Energy Solution

Some Mythical notions about induction generator

 

- (1) When an induction motor changes its state to generate power; It is elevating the voltage. It's only becomes a generator when its pole to pole voltage if higher then of the grid; it may add a from 0%->50% to the voltage its receives from the grid Please refer to the read outs from the pictures of scope

 

- (2) One can use off the shelves induction motor to run as generator. It is not at all the case; while a typical motor has a 10% tolerance; when it acts as grid tie generator at times it requires up to 50% tolerance. Therefore a 110v/220v induction motor will burn if it is configured to run as a 220v induction generator. It only works . . . good if it is running at 220+10% =242V but at times the pole to pole voltage may raises to 220 +50% = 330V. At this voltage most 220v motor will burn. Please refer to the read outs from the pictures of scope

 

- (3) Assuming a motor is having the 25% tolerance; a motor has an XX rated power. Because its the voltage is elevating, the power it produces may higher then that XX stated at the plate

 

- (4) An induction generator radiates more heat compare to when it is running as a motor. There are two reasons to be noted. (a) Because it turns at slow speed, its fan is not effective, (b) it operates at higher voltage

 

- (5) An induction generator needs a slightly different scheme to attack the inrush current problem, as the generator it already has the torque while as motor it needs the torque to start

 

- (6) The notion that it need the synchronous RPM + 10% to turn into a generator; It is not always true, At synchronous RPM + slip x 2 it may generate up to twice of the rated power, Beside that an induction starts generating power as long as it turn faster then its synchronous RPM.

 

- (7) There is also a recursive phenomena. It depends on how far the distance of the generator is from the grid. The longer the motor wired the higher its pole to pole the voltage.

 

 

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Some Interesting pictures

From the third party.

(1) The set up. Please note at the net metering meter from (ekmmetering.com). it is: "Total Reverse kW to Grid : Shows 0.61 kWh at 55V by 300 rounds (50 x 6 times with 5 min interval) of rotor by hand approx 120rpm speed".

Please note that the specification of the meter show register1 is the accumulation of both directions (it's kind of confusing)

The setup (Note: This setup only functions at low voltage V < 15 x winding resistance of the motor and requires a transformer)

After First 50 turns. Resister 1 Register 2

After The 2nd 50 turns Resister 1  Resister 2

After The 3rd 50 turns Resister 1 Resister 2

After The 4th 50 turns: Resister 1 Resister 2

After The 5th 50 turns: Resister 1 Resister 2

Ours.

Minumin require part

Relay

NTC

Cap & Resistor

Rectifier

Other Rectifier

One way of connection

Next connecttion

Other

Other

Other

Put All together

Spagetty

Detail

More Detail

Even More

Some Wiring

Other Wiring

Testing station

VFD & Net metering meter

VFD /Inverter

AC grid without generator running

AC Grid when the generator running

Large Generator Testing (Note: We do not speed up but speed down)

 

 

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