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I am thinking about designing a radial flux permanent magnet generator. However, I could not find any information about determining the tooth width. Should the tooth width be all the way the same as the magnet width, or can it be thicker? enter image description here

So I am interested in lt and lv relation.

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  • \$\begingroup\$ teeth should not be wider than the magnet spacing, having tooth spacing the same as magnet spacing is required if you're making a single phase generator. \$\endgroup\$ – Jasen Jul 14 '18 at 12:12
  • \$\begingroup\$ Thanks! By magnet spacing, you mean the spaces between magnets or the length of magnets? What changes in case of a three phase generator? \$\endgroup\$ – Daniel Husztik Jul 14 '18 at 12:52
  • \$\begingroup\$ length of magnets, or distance centre to centre. \$\endgroup\$ – Jasen Jul 14 '18 at 20:49
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For the best design, permanent magnets fastened to the surface of a generator rotor would likely emulate the construction of a wound field synchronous generator. The same would likely be true for the stator design.

In a salient-pole, wound-field synchronous machine, the most satisfactory pole embrace is about 70 to 72 percent. The stator windings are distributed in slots with a certain number of slots per phase per pole. Slots are evenly distributed around the entire circumference of the stator with no unused slots between poles.

The air gap between a pole shoe and the stator iron is smallest at center and somewhat larger at the edges with the edges rounded at the edge.

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