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A Dahlander motor (also known as a pole changing motor, dual- or two speed-motor) is a type of multispeed three-phase 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.
Robert Dahlander (9 June 1870 – 18 October 1935) was a Swedish engineer and public agency administrator. He was also highly active and commissioner in several ...
Once started at synchronous speed, the motor can operate with sinusoidal voltage. Speed control requires a variable-frequency drive. High-powered SynRMs typically require rare-earth elements such as neodymium and dysprosium. However, a 2023 study reported the use of a dual-phase magnetic laminate to replace them.
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Where higher speed is desired, these motors can be operated in parallel, making a higher voltage available at each motor and so allowing higher speeds. Parts of a rail system might use different voltages, with higher voltages in long runs between stations and lower voltages near stations where only slower operation is needed.
The key feature of the Ward Leonard control system is the ability to smoothly vary the speed of a DC motor, including reversing it, by controlling the field and hence the output voltage of a DC generator, as well as the field of the motor itself. As the speed of a DC motor is dictated by the supplied voltage, this gives simple speed control ...
(Reuters) -Amazon is set to release its long-awaited - and delayed - Alexa generative artificial intelligence voice service, said three people familiar with the matter, and has scheduled a press ...
A variable speed motor drive is a system that includes a motor that is continuously variable in speed. If the motor is generating electrical energy rather than using it, the motor drive could be called a generator drive but is often still referred to as a motor drive.