Inhibition of iron core eddy current with iron core lamination method and method of improvement
Using the method of iron core lamination core eddy current and 2019 - method improvement
30 15:05:42 in order to reduce core eddy current and the previous analysis has such several possible methods: reduce the contact diameter, increase the increase of distance, turn the arm width, reduce the iron core of electric conductivity, reducing the relative magnetic permeability core.
In these methods, involves the design parameters of the equivalent size, material, generally speaking, change the quantity is not very easy.
In a effective way to reduce the eddy current in iron core from its distribution.
Can be seen from the figure 3, if the eddy current flow path will cut iron core, namely adopt the method of lamination may reduce eddy current, the numerical analysis results show that it is an effective way.
The direction of the eddy current flow in the core will iron core lamination, to prevent the flow of the eddy current to reduce the eddy current.
Calculation results show that the peak current, when core cut into 4 don't slice of eddy current of eddy current value is the core value of 17.
5%, iron core cut into 8 films don't slice of eddy current of eddy current value is the core value of 9.
9%, eddy current value is the core of core slice into 10 films don't slice of eddy current value of 2.
After current zero, when core cut into 4 don't slice of eddy current of eddy current value is the core value of 46.
2%, iron core cut into 8 films don't slice of eddy current of eddy current value is the core value of 29.
1%, iron core is cut into the value of the eddy current of 10 for a little while the eddy current value of core slice not 23.
Thus iron core lamination is an effective method to suppress vortex.
Iron core lamination method improvement now laminated method is the core of the whole cut through, then put the iron chips together with rivet.
This method of processing the demand is higher, manufacturing cost, and will still after iron chip riveting together with eddy current by inevitably.
Adopt a new method can reduce the requirement of process, reduce the cost.
This method is not cutting through when core slice, but a small part at the bottom left will iron chips together.
In order to verify the feasibility of this method, the numerical analysis of the project, the results show that when using the new scheme (after
Leave a 3 mm)
, iron core 4 and 10 slices of eddy current value compared to the original plan about doubled, but the location of eddy current value at the end of core slice positions, far away from the contact clearance, and little influence on the magnetic field of the contact clearance.
When the current through the zero, clearance between the longitudinal magnetic field value almost unchanged.
So the improvement scheme is feasible.
New scheme can make the process more simple, so as to reduce the cost, at the same time more effectively reduce the influence of eddy current.