Skewed outside stator winding video

[Clyde38]

I have been trying to find a video that shows how an outside stator PM synchronous motor is wound if the stator is skewed. Typically the stator is stacked "loose" with just the cuffed slot liners holding the stack together. Then the shed/transfer winding method is used to insert the coils in the stator. After that the stator is skewed. I can find plenty of videos for AC induction motors that do not have the stator skewed (as well as a lot of other types of winding methods).
Examples:

https://www.youtube.com/watch?v=alHsIWJe_Bw

https://www.youtube.com/watch?v=cBme1llBnaY&t=2s

https://www.youtube.com/watch?v=jO9cXukt6g4

There are plenty more . . .


Thanks for you help.

Clyde Hancock
Design & analysis of electric motors and generators

https://www.motorconsultants.com/home.html

 

[zlatkodo]

At first glance, it is easier to manufacture a rotor with skewed magnets, then the stator winding with skewed slots.
An effect is the same, probably.

Tech Support for Rewind Shops

 

[Clyde38]

Thanks, and yes in some cases this is true however not the case with IPM's (Interior Permanent Magnet Example:

http://www.mdpi.com/1996-1073/9/8/580).

The rotor can be made in segments (axially) and then staggered to have a similar effect of skewing. I know that the stator can be skewed, and I have observed the process. I just can't seem to find a video for this. I thought maybe someone may have come across this because my search efforts have not.

Clyde Hancock
Design & analysis of electric motors and generators

https://www.motorconsultants.com/home.html

 

[zlatkodo]

I have no link to video but I think the inserting the stator coils is probably manually.
Skewing the stator slots is not exclusively related to PM synchronous motors only.
There are lot of conventional motors where the stator slots (instead of rotor bars) are skewed . The goal is the same: to reduce some harmonics that can't be reduced even when the best possible kind of winding is selected.
I am not an expert for PM rotors but if it is about design of new motor , the skewing the rotor magnets could be a better solution, because there is a possibility to make a some kind of slight U-shape ( not diagonal) of skewing, with better performance, that is not feasible with stator slots.
Here are some photos of 3-phase motors with PM rotor:
[URL unfurl="true"]http://winding.wixsite.com/design/single-post/2016/11/26/3ph-Windings-for-PM-motors[/url]