page_title: Dahlander pole changing motor
section_title: Invention
hierarchical_section_title: Dahlander pole changing motor / Invention
caption_attribution_description: English: portrait of Robert Dahlander
context_page_description: A Dahlander motor is a type of multispeed induction motor, in which the speed of the motor is varied by altering the number of poles; this is achieved by altering the wiring connections inside the motor. The motor may have fixed or variable torque depending on the stator winding. It is named after its inventor Robert Dahlander.
context_section_description: Robert Dahlander, a Swedish engineer working for ASEA, discovered that switching the poles in a motor led to a reduction in the speed of the motor. In 1897 he invented an electrical configuration to switch between poles in a motor for which he was granted a patent along with his co-worker Karl Arvid Lindström. The new connection was named the "Dahlander connection" and a motor having such a configuration is commonly referred to as a "pole changing motor" or a "Dahlander motor".
caption: Robert Dahlander
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