Dahlander Dual Speed MotorsThe 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

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Two Speed Constant Torque

Motor

Speed Line Short

High 4,5,6 1,2,3

Low 1,2,3

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