Dahlander Dual Speed Motors

The Dahlander motor is a two speed motor that offers a 1 : 2 speed switching. It is a specially wound pole switching motor requirng a special dual speed starter.

The Dahlander motor is wound as a star motor or a delta motor with center taps on each leg of the winding. The motor is connected in star or delta for one speed and in "double star" for the other speed.
The starter requires three contactors, a speed 1 main contactor and a speed 2 main contactor and a speed 2 star contactor. Two over load protection relays are required, one in series with each of the main contactors.
Dahlander motors can be would for constant power, variable torque or constant torque applications.
A constant power Dahlander motor is would as a delta motor, and a constant torque motor is wound as a star motor.

Circuit

Two Speed Constant Power Motor

Speed	Line	Short
High	4,5,6
Low	1,2,3	4,5,6

Two Speed Variable Torque Motor

Speed	Line	Short
High	4,5,6	1,2,3
Low	1,2,3

Two Speed Constant Torque Motor

Speed	Line	Short
High	4,5,6	1,2,3
Low	1,2,3

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