The segments narrow towards the centre, leaving less room to arrange windings and connections.Uneven flux distribution due to wedge-shaped segments.The rotor is typically much wider, causing increased rotational inertia, and the higher centrifugal forces can reduce the maximum rotational speed. An axial flux motor is a geometry of electric motor construction where the gap between the rotor and stator, and therefore the direction of magnetic flux.Since the magnetic path through the windings is straight, grain-oriented electrical steel can be easily used, offering higher permeability and lower core losses.Most structural components are flat and can be produced without specialised casting or tooling.Potentially shorter magnetic path length.It is often possible to make the rotor significantly lighter.Since the coils are flat, rectangular copper strips can more easily be used simplifying high-current windings.The coil winding process and the process of joining the coil and core may be simpler.A motor can be built upon any flat structure, such as a PCB, by adding coils and a bearing.The company began with a focus on wind energy applications, designing a motor that becomes a generator. According to Maxmax, its motor is 50 to 75 lighter than radial flux direct drive machines for similar power. ( March 2022) ( Learn how and when to remove this template message) This axial-flux topology provides machines that are less wide and heavy as well as being more compact, yielding greater efficiency. Unsourced material may be challenged and removed. Please help improve this section by adding citations to reliable sources. One of the longest produced axial motors is the brushed DC Lynch motor, where the rotor is almost entirely composed of flat copper strips with small iron cores inserted, allowing power-dense operation. High-power, brushless axial motors are more recent, but are beginning to see usage in some electric vehicles. Axial motors are typically shorter and wider than an equivalent radial motor.Īxial motors have been commonly used for low-power applications, especially in tightly integrated electronics since the motor can be built directly upon a printed circuit board (PCB), and can use PCB traces as the stator windings. Axial geometries allow some magnetic topologies that would not be practical in a radial geometry. Even within the same electrical operating principle, different application and design considerations can make one geometry more suitable than the other. brushed DC, induction, stepper, reluctance) that can be used in a radial motor. Īlthough this geometry has been used since the first electromagnetic motors were developed, its usage was rare until the widespread availability of strong permanent magnets and the development of brushless DC motors, which could better exploit this geometry's advantages.Īxial geometry can be applied to almost any operating principle (e.g. The rotor shown to the right is magnetized axially with alternating polarity.Īn axial flux motor (also known as an axial gap motor, or pancake motor) is a geometry of electric motor construction where the gap between the rotor and stator, and therefore the direction of magnetic flux between the two, is aligned parallel with the axis of rotation, rather than radially as with the concentric cylindrical geometry of the more common radial gap motor. A miniature DC brushless axial motor showing the integration with PCB construction techniques.
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