SMALL AXIAL FLUX MOTOR DRIVERS
SMALL AXIAL FLUX MOTOR SKIN
SMALL AXIAL FLUX MOTOR FULL

“The power-to-weight ratio is really a record number, and much better than conventional motors,” Markus Schaefer, Mercedes’s chief technology officer, said of the automaker’s upcoming AMG electric vehicle platform.

Whereas in the combustion age, quicker times off the line and higher top speeds were achieved with more engine cylinders, manufacturers will differentiate performance EVs by getting the most out of batteries with lighter and more efficient motors. All EVs offer the sensation of instant acceleration, from Nissan’s Leaf to Tesla’s Model S Plaid. High-end motors like these will be crucial to brands like AMG and Ferrari as they race to electrify the high-performance vehicles that earn prestige and bumper profits. Axial flux motors are much smaller than predominantly used radial motors, yet pack a more powerful punch. Mercedes-Benz AG and Ferrari NV are turning to this type of electric motor to generate headrest-hitting torque. No, not flux capacitors, but axial flux motors.

SMALL AXIAL FLUX MOTOR DRIVERS

When drivers of future Mercedes AMG models stomp the accelerator of their electric performance cars, they’ll get extra oomph out of the batteries from something that sounds straight out of ' Back to the Future.' I will be doing test on it later.Axial flux motors: Mercedes and Ferrari’s edge in electric car performance Smaller, lighter, more efficient, they open all sorts of performance possibilities The motor works well, it runs smooth, self starts, and has good torque considering the build. thus there was just enough room on mine for three coils with 12 poles and 4 turns around the torus's major diameter. Doing it this way causes the wires to takes up more space on the inside diameter of the torus. Considering the difficulty in wrapping 16 gauge wire on a flat torus and no CNC to cut grooves on the inside and outside, I decided to use nails on a flat board and wrap the wire on the nails.

SMALL AXIAL FLUX MOTOR SKIN

I am not as certain that reduced skin effect would benefit my low speed motor much, but maybe it would considering the BLDC controller's uses pulse width modulation switching at on and off at a fast rate. The downside is it has a lower copper fill rate. On using litz, in theory and when used appropriately, it would do a better job of reducing skin effect at high frequency. 'is the faulhabor better than a tear drop?' I do not know what a tear drop coil is to comment. The farther away phase has less than half the voltage induced across it. Looking at the two curves on the scope screen, the yellow trace is the phase close to the rotor, while the blue one is the phase farther away. Since they were wired in parallel, this caused massive circulating currents between the two halves of the stator, causing the drag that felt like eddy current drag. With only one half of the rotor in place, the two halves of the stator experience very different fields from the magnets on the rotor. Scoping corresponding phases on the two stator windings confirmed my suspicion. On a hunch, I unparalleled the two halves of the stator from each other. And it displayed the exact same drag as the epoxied-and-baked stator. Before epoxying everything, I quickly tested it. I had set the oven to 120 C, so maybe there was a chance the temperature control loop overshot to 150 C, which would be dangerously hot for the insulation. But wasn't the point of using fancy litz wire to eliminate that? At first I thought the process of oven-curing the epoxy had destroyed the litz part of the litz wire. By chucking the rotor in a drill and spinning it, I could even feel the windings warming. Just spinning the rotor by hand, it was easy to see how quickly the rotation was damped. Nice and noisy with the hobbyking controller.Īlso, the motor displayed astoundingly high loss at high speed. First, it definitely wants sinusoidal commutation.

SMALL AXIAL FLUX MOTOR FULL

13 N-m/A with the full rotor, so that number is pretty in line with my prediction.Ī couple things are apparent. 055 N-m/A (175 RPM/volt) with only half of the rotor when wye terminated. Also, a drill-and-scope back EMF test showed a torque constant of. I first tried with a sketchy ebay chinese e-bike motor controller, but I think the motor was too low inductance, causing the controller's current control loop to misbehave. Testing was done with a crufted hobbyking sensorless controller.

Small axial flux motor