Axial Flux Motor Magnet, PM Axial Flux Motors Magnet, AXIAL FLUX ELECTRIC MOTOR MAGNETS, Axial and radial flux motors. As with other motor designs that include permanent magnets, PMAC axial flux motors exist.
What is axial flux motor?
An axial flux motor is different from conventional electric motors due to the different path of the magnetic flux. In conventional motors the flux flows radially through the air gap between the rotor and the stator. However in this motor the flux flows parallel to the axle of the motor. This type of rotor is often referred to as a pancake rotor and can be made much thinner and lighter than other types. When quick changes in speed are required, axial flux motors are an ideal choice.
Axial flux machines are classified based on the rotor structure. It is termed an axial flux induction machine if the rotor structure is a squirrel cage; an axial flux surface mounted permanent magnet machine if the rotor is formed by surface mounted permanent magnets; and an axial flux interior PM machine if the rotor has an interior magnet structure. In this paper, the focus will be on axial flux surface mounted PM machines with different rotor configurations but there will be a short review of some other type of AFMs and applications as well.
The basic and simplest axial flux structure is the singlerotor- single-stator structure. The stator consists of a ring type winding embedded in epoxylike material and an iron disc which is manufactured from a simple tape wound iron core. The rotor is formed from a solid steel disc on which the magnets are embedded.
An axial-flux permanent-magnet machine with one-rotor-two-stators configuration has generally a weaker efficiency than a radial-flux permanent-magnet machine if for all designs the same electric loading, air-gap flux density and current density have been applied. On the other hand, axial-flux machines are usually smaller in volume, especially when compared to radial-flux machines for which the length ratio (axial length of stator stack vs. air-gap diameter) is below 0.5.
With a frequency converter, axial flux induction motors are applicable to various pump, compressor, blower or similar applications, where the variable-speed technology shows significant energy savings compared with a fixed-speed (on-off) type drive or other traditional process control methods, such as valves. Because of the obtained energy savings, the VSD technology is well adapted to industrial use, and the number of variable-speed drives is steadily increasing. As for motors, our motors meet the high-efficiency motor (eff1 motor) specifications for electric motors.
These motors incorporate a unique stator and rotor design with surface mounted permanent magnets to deliver high power at efficiencies far superior to high-performing induction motors.
Axial Flux Permanent Magnet Brushless Machines. They are being increasingly used in consumer electronics, public life, instrumentation and automation system, clinical engineering, industrial electromechanical drives, automobile manufacturing industry, electric and hybrid electric vehicles, marine vessels and toys.
Advantages of axial flux motor
Compact structure, especially short axial sizes.
High torque density.
High power density.
Excellent cooling performance.
Application of axial flux motor
Based on above advantages, axial flux motor is perfect for high torque density and space compact applications. Most people believe that the high power density only depends on high speed, and overlook the influence of torque density. The mere pursuit of high speed will lead the short service time and noise. In fact, the core of the high speed motor is the enhancement of torque density, and axial flux motor is a typical solution among them.
The most commonly used electrical propulsion system for both hybrid and battery electric vehicles uses a permanent magnet, synchronous radial flux traction motor. Such motors are also called synchronous brushless DC (BLDC) motors. Derived principally from pump and industrial motor designs, the robust design uses rare-earth magnets located along the outer edges of a plate, called the rotor. Alloying rare earth materials, such as neodymium and dysprosium, into iron creates magnets with much greater magnetic strength than standard iron magnets.
About Axial flux motor magnet
HSMAG Team has been collected a lot of useful experience on axial flux motor magnet during these years. Here below two simple solutions for axial flux motor magnet:
a. Axial flux motor magnet with skewed fan shape
For slotted motor, the cogging torque cannot be avoided due to the interaction between the permanent magnet and the stator tooth, hence lead to torque ripple, vibration and noise. The cogging torque of axial flux motor will be suppressed after changing the traditional fan shape axial flux motor magnet into skewed fan shape.
b. Laminated type axial flux motor magnet
Axial flux motor is also suffering from eddy current losses, and its work efficiency will be also affected by the high temperature demagnetization. Magnet segmentation technique is an advisable choice to decrease the eddy current losses of axial flux motor magnet. It should be noted that the effects of horizontal segmentation will be much better than vertical segmentation’s.
c. Disc magnet axial flux motor permanent magnet
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