Utredning av effektiva elmotorer för fläktdrift
Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
Fläkt Woods is a global manufacturer of fan and air climate systems, they produce the fans and climate systems themselves but they buy the motors from other manufacturers. The objective in this report is to compare the technical differences between the motors and to find where each motor is best used.
The EC and PMSM-motors are both permanently magnetized and over all they are built very similar. The main difference is shown in the back-EMF, the EC-motor is using a trapezoidal back-EMF while the PMSM-motor uses a sinusoidal back-EMF. The PMSM-motor has a higher degree of efficiency, especially at higher speeds. At lower speeds there are EC-motors showing higher efficiency then the PMSM-motor at around 1300 rpm and below. The second main difference between the motors is the sensors. The EC-motor can use hall-sensors, while the PMSM-motor need more sophisticated sensors because of the sinusoidal current.
To lower the electric cost of motors a very important part is to dimension it appropriate. If the motor is over dimensioned the efficiency will be lowered because it won’t operate at its optimal speed. Both the EC and PMSM-motor have better efficiency then the older AC-motor, despite this it is still up to the customer to decide what type of product they want to buy. Today the most sold motor for fans is still the AC-motor. This is because of the AC-motors simple construction, the customers high knowledge about the motor and because it is much easier to find spare parts.
Place, publisher, year, edition, pages
2012. , 20 p.
EC-motor, PMSM-motor, Permanentmagnetiserad, Fläktar
IdentifiersURN: urn:nbn:se:umu:diva-59459OAI: oai:DiVA.org:umu-59459DiVA: diva2:552352
Fläkt Woods AB
Bachelor of Science Programme in Energy Engineering
2012-06-05, 19:47 (Swedish)
Weinehall, Dan, Univ.adjunkt
Östin, Ronny, Universitetslektor