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update. with this amount of investment made, we will be able to build a test bed for future test/experiment. Looks like we will be getting a 4-quadrant inverter, which will then be able to link it back to the 900kW inverter (via the busbar i suppose). That way the 4-quadrant inverter should act...

There are two caged induction motors which were given to us in a bad condition and were refurbished to like-new now. I am thinking of doing a demonstration of having one motor driving another motor to generate power. Motor A is rated to 300kW 4kV 4pole 60Hz, Motor B is 400kW 6kV 4pole 50Hz...

As mentioned in my previous post, I did a random search on the internet to find for a picture to post as zlatkodo requested for one. I certainly do not know why the stator has holes around it. I have never thought of the phase separators. If all of the winding wires are insulated against 4kV...

That is a stator of a type of submersible motor, which will be rewind from an OEM. The whole of the motor when running is filled with plain water. Winding cables are all fully insulated to withstand the rated voltage to earth. To wind the stator, it must be pull through as the stator slots have...

I do not have a picture to show but it is very similar to this type of windings Link It is 4000V.http://files.engineering.com/getfile.aspx?folder=7a1baf27-aa94-41d2-ac74-dae7c8d31191&file=Doc1.docx

rhatcher, the coils that were wound was concentric, random wound. wires were manually pulled through. I have never seen form coils in concentric before. All of the pull through windings I have seen were done where the slot openings are too narrow for a drop in coils.

the motor voltage is 4kV, connected in two parallel star

btw, zlatkodo, the website you provided has lots of "eye-catching" diagrams.

Thank you for all for the advice. These are all useful advices. Motorwinder pointed out savings in copper, although this wasn't the main reason from rewinding the stator in single layer concentric, it may be a good reason for motor designers to consider single layer windings with 2 groups of...

This is for a 4-pole stator. The winders are more familiar with concentric windings and it is easier to wind. The size of the stator is about 20".

How do you convert from double layer lap 1-9 to single layer full pitch concentric and double layer concentric? What coil span would you recommend when converting to double layer concentric? The stator has 36slots, 12 turns per coil, 2 parallel star. The coils are random wound pull through.

Is there an equation to work out the value for a tightly compressed stator lamination with a given diameter and pack length?

Thank you, electricpete. 1. My fingers are aching as I tried to follow closely with the right hand Fleming. You said "Pointer in direction of flux (to the right)", but I read that the flux encircles but which direction we should be looking at? 2. Where are slot wedges normally located (or...

With regards to caged induction motor, How does winding move within the slots when voltage is applied? Can this be explain by the left hand fleming? Does the rotor bars play any role in "pushing" the stator coil to either side of the slot as to minimise its movement?

The response overwhelmed me with lots of information. Basically I am required to give a budgetry fora motor cartridge for subsea compression. The motor which I am supposed to quote, excludes thrust bearing and pump which will be provided by other vendor. The motor must be sized so that it...

Anyone knows what WK and GD stands for in WK^2 and GD^2? I know that GD^2 = WK^2 * 4 (the former is in diameter, the latter is in radius).

It was asked from a customer to furnish the motor capacitance of stator windings to ground. I would assume, as electricpete mentioned above, it will be used for system grounding calcs and ac flash test. Being a novice in this area, the term motor capacitance as it was initially requested for, is...

Hi all, It is actually the capacitance of motor windings per phase to ground. Since the stator is a wet-wound type of induction motor, I can actually assume that the capacitance is between conductor and the winding insulation outer diameter(including conductor). Therefore, Capacitance...

Thank you all. That's a lot of new things here for me to absorb.

I was asked to calculate the "motor capacitance" of a VFD motor. The term motor capacitance sounds too general, and I do not know why it is needed. I would have thought capacitance is between two or more plates separated by a medium (eg airgap), that's how I assumed the capacitance equation.