1) Voice coil number = DC resistance × 1000000 ÷ 3.14 ÷ (voice coil inner diameter) ÷ line diameter impedance
2) Voice coil volume = number of turns × maximum outer diameter of the wire diameter ÷ voice coil layer + (coefficient × wire diameter maximum outer diameter)
(When the wire diameter is copper wire, the coefficient is 1.5 times; when the wire diameter is CCAW, the coefficient is 1.2)
3) Maximum outer diameter of voice coil = maximum outer diameter of wire diameter × 2 × number of voice coil layers + 2 × BOBBIN thickness + voice coil inner diameter + coefficient
(When the layer is less than or equal to the second layer, the coefficient is 0.1; greater than the second layer, the coefficient is 0)
4) Voice coil winding weight = DC resistance × 1000 ÷ wire diameter impedance × wire diameter specific gravity (unit: gram)
5) The calculation formula of the flat line is the same as the above formula, but the change is: there are some differences between the calculation of the web width and the maximum outer diameter as the flat line is vertical or flat, as follows:
When A is winding:
1) voice coil volume = number of turns × maximum diameter of the flat wire thickness diameter ÷ voice coil layer
2) Maximum outer diameter of voice coil = maximum outer diameter of flat line width diameter × 2 × voice coil layer + 2 × BOBBIN thickness + voice coil inner diameter
When B is flat:
1) voice coil volume = number of turns × maximum outer diameter of the flat line width diameter
(When the wire diameter is copper wire, the coefficient is 1.5; when the wire diameter is CCAM, the coefficient is 1.2)
2) Maximum outer diameter of voice coil = maximum outer diameter of flat wire thickness diameter × 2 × voice coil layer + 2 × BOBBIN thickness + voice coil inner diameter + 0.1
6) Calculation formula of voice coil BOBBIN weight:
BOBBIN weight = BOBBIN length × BOBBIN height × BOBBIN thickness ÷ 1000 × BOBBIN specific gravity (unit: gram)
7) The weight of the reinforcing paper is calculated in the same way as the BOBBIN weight.
In the above formula:
The wire diameter impedance, the wire diameter specific gravity, the maximum outer diameter of the wire diameter, and the BOBBIN specific gravity are all referred to the relevant schedule.
Example: The voice coil specification is: 25.4×22×3.6×0.19×ASV/0.07 second floor
Number of turns = 3.6 × 1000000 ÷ 3.14 ÷ 25.4 ÷ 640.6 = 70.5
Coil = 70.5 × 0.221 ÷ 2+0.221 × 1.5 = 8.1
Outer diameter = 0.221 × 2 × 2 + 2 × 0.07 + 25.4 + 0.1
Line weight = 3.6 × 1000 ÷ 640.6 × 0.26 = 1.46
BOBBIN weight = 25.4 × 3.14 × 22 × 0.07 ÷ 1000 × 2.73 = 0.34
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