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FiberPrinted™ Slotless Motors
Alva's FiberPrinted™ Slotless Motors, offer superior precision & torque density. In combination of zero cogging torque & perfectly linear behavior, they also rival slotted motor in terms of power & torque density. With virtually no saturation & reduced losses, they deliver high performance & compactness for precision applications.
Precision of Slotless motors
FiberPrinted™ motors exhibits a perfectly linear behaviour in all nominal conditions due to the absence of cogging torque, low back-EMF THD & that they essentially never saturate. This allows for ultra-precise angular control with simple control-electronics & control-algorithms.
A FiberPrinted™ motor has zero cogging torque due to the symmetrical magnetic interaction between the stator & the rotor. A symmetrical magnetic interaction is achieved since the laminations around a FiberPrinted™ stator is perfectly cylindrical.
Due to the geometrical simplicity of a FiberPrinted™ motor in combination of a Halbach array rotor, the stator & rotor can be optimised to generate an almost perfect sinusoidal back-EMF even at high torque-levels & temperature fluctuations.
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Performance of Slotted motors
The technical advantages of FiberPrinting™ result in slotless motors that are far superior to any other motor technology for high-precision applications. A FiberPrinted™ motor has the same motor-constant vs. mass ratio as a slotted motor. This means that a FiberPrinted™ motor has the same continuous power & torque density as a slotted motor.
FiberPrinted™ motors also have the advantage of virtually no saturation of the stator, enabling a peak torque well beyond that of an equivalent slotted motor.
The performance advantages of FiberPrinted™ motors allow you to transition from slotted motors to improve precision without incurring any performance or weight penalty. Additionally, they can replace legacy precision slotless motors to enhance both performance & weight.
The technical advantages of FiberPrinting™ result in slotless motors that are far superior to any other motor technology for high-precision applications. A FiberPrinted™ motor has the same motor-constant vs. mass ratio as a slotted motor. This means that a FiberPrinted™ motor has the same continuous power & torque density as a slotted motor.
FiberPrinted™ motors also have the advantage of virtually no saturation of the stator, enabling a peak torque well beyond that of an equivalent slotted motor.
The performance advantages of FiberPrinted™ motors allow you to transition from slotted motors to improve precision without incurring any performance or weight penalty. Additionally, they can replace legacy precision slotless motors to enhance both performance & weight.
Alva’s slotless motor technology results in a thin stator & rotor compared to both slotted motors & other slotless motors, allowing a large inner diameter of the rotor. Other components, for example gears, can more easily be placed inside the frameless motor, to increase overall system compactness.
One of limiting factors of iron-cored motors is the strong magnetic interaction between the magnetic field from the rotor & the iron-teeth of the stator. The strong magnetic interaction generates losses in the iron-teeth which grows exponentially with the rotational speed.
The magnetic interaction between the rotor & the lamination ring in a FiberPrinted™ stator is highly reduced since the distance between them is increased. The iron-losses of a FiberPrinted™ motor are therefore negligible compared to other losses. The reduced iron-losses allows for both higher efficiency at high rotational speed & for large diameter motors without any performance penalty.
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