VARS – The Vange Amateur Radio Society 1 A presentation by: Steve, G0KVZ 30 th July 2009.

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Presentation transcript:

VARS – The Vange Amateur Radio Society 1 A presentation by: Steve, G0KVZ 30 th July 2009

VARS – The Vange Amateur Radio Society 2 Early power generation and distribution was using d.c. See:

VARS – The Vange Amateur Radio Society 3 P = I R 2 The distribution of power at low voltages leads to large losses

VARS – The Vange Amateur Radio Society 4 time Amplitude Scientists started to experiment with a.c. electricity

VARS – The Vange Amateur Radio Society 5 The price of copper makes large gauge cables costly Large gauge cables would require substantial pylons

VARS – The Vange Amateur Radio Society 6 a.c. generation and distribution soon established the transformer

VARS – The Vange Amateur Radio Society 7 Left hand rule - MotorsRight hand rule - Generators

VARS – The Vange Amateur Radio Society 8 ? A number of variations, but two basic types of device

VARS – The Vange Amateur Radio Society 9 Simple bobbins are easiest to wind

VARS – The Vange Amateur Radio Society 10 Video Of Linear Winding

VARS – The Vange Amateur Radio Society 11 Fly winding techniques

VARS – The Vange Amateur Radio Society 12 Whiteboard description

VARS – The Vange Amateur Radio Society 13 Standard transformers need the core to be applied after winding

VARS – The Vange Amateur Radio Society 14 Video Of Laminating Machine

VARS – The Vange Amateur Radio Society 15 Ferrite is an alternative core material

VARS – The Vange Amateur Radio Society 16 “C” Core transformers

VARS – The Vange Amateur Radio Society 17 Each pass through the centre of the core counts as one turn

VARS – The Vange Amateur Radio Society 18 Magnetic flux Leakage flux Secondary Winding Primary Winding Secondary Winding Negligible leakage flux due to lack of gaps in torus. Similarities and differences

VARS – The Vange Amateur Radio Society 19 Toroids often require more work in terminating & finishing

VARS – The Vange Amateur Radio Society 20 Video Of Toroidal Winding

VARS – The Vange Amateur Radio Society 21 Video Of Toroidal insulation machine

VARS – The Vange Amateur Radio Society 22 Advantages of Toroidal designs

VARS – The Vange Amateur Radio Society 23 All types of transformer require environmental protection

VARS – The Vange Amateur Radio Society 24 Some examples of different construction styles

VARS – The Vange Amateur Radio Society 25 Video Of Spring winding

VARS – The Vange Amateur Radio Society 26 Design considerations

VARS – The Vange Amateur Radio Society 27 configuration

VARS – The Vange Amateur Radio Society 28 Modification

VARS – The Vange Amateur Radio Society 29