Somaloy 500/700/1000 Soft Magnetic Composite For Axial Flux Motor

The difficulty in manufacturing the coiled core of the stator of the disc motor is the main reason restricting its application. During the rolling process, there will be the following problems:
1. The stator slot mold of the punching mechanism is fixed, so the horizontal width of the stator slot punched out on the strip material remains unchanged. However, as the thickness of the crimp increases, the radius of the coil increases and the actual width of the slot changes. 2. As the rolling thickness increases, the distance between the grooves punched out by the punching mechanism will also increase. It is particularly important to ensure the quantitative relationship between the groove pitch and the rolling thickness. If the accuracy is not enough, it will cause the stator slot size to be skewed. Reduce utilization. 3. The iron core at the inner diameter of the iron core, since there is no foreign object attached, its shape is guaranteed entirely by the properties of the material itself, and the rolling effect is relatively poor.

To solve the above problems for me, we started to engage in SMC iron cores formed by powder pressing to solve the problem of iron core rolling.
There is an insulating film between the raw iron powder used in the SMC iron core, so the magnetic permeability of the SMC iron core material will be lower than that of the iron core, and the strength will not be as low as it is; and the SMC iron core is pressed and non-oriented, which requires the user to advance cognition.

As a professional SMC core manufacturer, we need to remind motor designers that: under the same magnetic field strength, the magnetic density of SMC core is much lower than that of silicon steel sheet, so when you consider using SMC core Replacing silicon steel without changing the design of the motor will not give full play to the advantages of the SMC iron core. In the field of traditional induction motors, the establishment of the magnetic field is achieved through excitation, and the magnetic field generated in the air gap requires a particularly large current to achieve, so the application of SMC cores in the field of induction motors is very difficult.
The comparison result of the iron loss value and the silicon steel sheet shows that the loss of the SMC core material is much higher than that of the silicon steel sheet at low frequencies. For example, at 50Hz and 1T, the loss is 452% higher; when the frequency exceeds 1000Hz, the iron core material of the SMC core The loss is basically the same as that of silicon steel. Therefore, the speed and frequency of the motor must be fully considered in the design and material selection of the motor to determine whether to use SMC core material or silicon steel material, which is more advantageous.

In some special motors, the magnetic circuit is three-dimensional, and the process of using silicon steel sheets to make the iron core is complicated. At this time, the use of SMC materials will greatly simplify the process. For example, the magnetic circuit structure of some special motors such as claw pole and disc structure motors is a three-dimensional structure. At this time, the advantage of SMC iron core is higher than that of silicon steel material. However, if SMC core materials are used to directly replace all two-dimensional magnetic circuit structure motors, the advantages of SMC cores cannot be fully utilized. SMC iron cores are suitable for use in fields that pursue high torque density, and are not recommended for use in motors that pursue high-efficiency industries.

Note:
The Pm value obtained from the above data measured at 23°C is 0.8T iron loss, unit: w/kg.
Remarks:Above data is obtained in temperature 23℃，the unit is W/kg

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