One Danish and one Norwegian technical publication are describing a new variant of the Switched Reluctance Motor (SRM)
called the U-core SRM, developed and patented by the Technical University of Aalborg, Denmark.
The U-core refers to the (for example 3 pairs of) U-shaped stators, which hold the DC-powered windings.
A new power electronic controller had to be developed, to properly switch the DC between the different
pairs of windings, in a BEV this controller will connect directly to the battery, without need for a DC to AC inverter.
Unlike previous SRM designs, the U-core variant gives the motor both less ripple in the produced momentum and increased efficiency over a wide working range.
Other advantages:
Uses no rare earth metals, reducing price and risks in supply chain
Uses less copper in a stator mount, making for a more compact and cheaper design
Disadvantage:
Less produced momentum making the motor mostly useful in a multi motor design,
e.g. as front engine that can work mainly during high speed cruising, or in a one motor per wheel design.
A 160 mm thick and 310 mm diameter prototype delivers peak torque of 106 Nm at 35 kW power, a power density of 2.9kW/L and an efficiency peaking at 94%.
English description:
CIPED | Compact Intelligent Powerful Electric Drivetrain for EVs
Danish:
http://ing.dk/artikel/danske-forskere-vores-elmotor-oger-elbilers-raekkevidde-med-fem-procent-188165
Norwegian:
Ny dansk motorteknologi kan gi elbiler lengre rekkevidde
called the U-core SRM, developed and patented by the Technical University of Aalborg, Denmark.
The U-core refers to the (for example 3 pairs of) U-shaped stators, which hold the DC-powered windings.
A new power electronic controller had to be developed, to properly switch the DC between the different
pairs of windings, in a BEV this controller will connect directly to the battery, without need for a DC to AC inverter.
Unlike previous SRM designs, the U-core variant gives the motor both less ripple in the produced momentum and increased efficiency over a wide working range.
Other advantages:
Uses no rare earth metals, reducing price and risks in supply chain
Uses less copper in a stator mount, making for a more compact and cheaper design
Disadvantage:
Less produced momentum making the motor mostly useful in a multi motor design,
e.g. as front engine that can work mainly during high speed cruising, or in a one motor per wheel design.
A 160 mm thick and 310 mm diameter prototype delivers peak torque of 106 Nm at 35 kW power, a power density of 2.9kW/L and an efficiency peaking at 94%.
English description:
CIPED | Compact Intelligent Powerful Electric Drivetrain for EVs
Danish:
http://ing.dk/artikel/danske-forskere-vores-elmotor-oger-elbilers-raekkevidde-med-fem-procent-188165
Norwegian:
Ny dansk motorteknologi kan gi elbiler lengre rekkevidde