Three Phase Motor Winding Types

Three Phase Motor Winding Types

Wye or Star wound

Delta Wound

 

Wye Wound Stators

 

3 lead:

•  designed for Across the Line Starts (XL)

•  single voltage application

•  relatively high inrush current

 

6 lead:

•  designed for part winding (PW) starts

•  designed to reduce inrush current

•  requires two contactors

•  time delay of .5 to 1.5 seconds to fully engage all windings

 

9 lead:

•  can be PW start for low voltage only

•  can be XL (cross line) starts

•  can be dual voltage

•  more adaptable

 

Note: higher voltage connections requires less current

Example: A dual voltage motor that when fully loaded draws 25 amps on the high voltage connection, when this motor is connected to low voltage the current draw may be 50 amps

Wye wound: High voltage connection
(coils in series)

Wye wound: Low voltage connection
(coils in parallel)



Delta wound: High voltage connection


Delta wound: Low voltage connection






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