[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

# Re: [femm] How to get the leakage inductance when very bad coupling and litz wires.

- To: femm@yahoogroups.com
- Subject: Re: [femm] How to get the leakage inductance when very bad coupling and litz wires.
- From: David Meeker <dmeeker@ieee.org>
- Date: Sun, 05 Jan 2003 22:13:01 -0500
- References: <20030105203831.98433.qmail@web14609.mail.yahoo.com>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826 MultiZilla/v1.1.22

`john fox wrote:`

> `Attached two examples at 25Khrz.`

>     The geometry is the same
>     7 turns with one amps each.
>     4 turns that I want to put on short circuit .

>     In case1_1.FEM the wire is a 0.9*1 square wire with
>     1A or 0A depending on the shortage .
>     In case 1_2.FEM the wire is a split in 2 wires 0.9*0.5
>     carrying each 0.5A . In fact 1A for the litz wire.

>     So the results from the two cases should be close when
>     applying Dave's summing circuit method. In fact not !
>     It seems to be a factor 4 coming for the value
>     impedance values and a factor 2 for the voltage.There
>     must be an adaption to make in the summing lua program
>     in this case.

>     This is for a 2 wires Litz. What factor should I be
>     applying for 5 or 13 wires ?

> `So , I need help and advise !`

`
Be careful that sum the impedances correctly. If you have split one turn several wires, each of which carries part of the current in the turn, you have to add the all of the impedances of the wires that make up the turn in parallel, i.e.`
`Zturn = 1/(1/Zwire1 + 1/Zwire2 1/Zwire3 + ...)`
`Then, you'd sum up the impedances of each turn in series to get the total impedance:`
`Ztotal = Zturn1 + Zturn2 + Zturn3 + ...`
`Rather than modeling each component wire in the Litz wire (which can get old real fast), you might try the sort of continuum approximation described in the example at http://femm.berlios.de/proxapprox.zip`
`Dave.`

    --
    David Meeker
    dmeeker@ieee.org
    http://femm.berlios.de/dmeeker

``

- Follow-Ups:
  - Re: [femm] How to get the leakage inductance when very bad coupling and litz wires.
    - From: David Meeker <dmeeker@ieee.org>

- References:
  - How to get the leakage inductance when very bad coupling and litz wires.
    - From: john fox <jire602000@yahoo.com>

- Prev by Date: How to get the leakage inductance when very bad coupling and litz wires.
- Next by Date: Re: [femm] How to get the leakage inductance when very bad coupling and litz wires.
- Previous by thread: How to get the leakage inductance when very bad coupling and litz wires.
- Next by thread: Re: [femm] How to get the leakage inductance when very bad coupling and litz wires.
- Index(es):
  - Date
  - Thread