Homebrewed Electricity > Wind

Report KD 718 about 16-pole PM-generator available

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Adriaan Kragten:
Report KD 718 can be copied for free from my website www.kdwindturbines.nl at the menu KD-reports. The title of this report is: "Ideas about a 16-pole, 3-phase permanent magnet generator using the housing and winding of a 4-pole asynchronous motor frame size 100".

This report describes a way how to modify a standard 4-pole, 3-phase asynchronous motor such that it can be used as a PM-generator for a wind turbine for 24 V or 48 V battery charging. Manufacture of the new armature is rather easy as the magnet grooves are wide and shallow. The magnet costs are low as only a rather small magnet volume is used. Mechanically the armature has sixteen poles but physically it has four poles and therefore it can work together with the standard winding of a 4-pole motor. The flow pattern is given in figure 2. The armature pole angel is 2.5° larger than twice the stator pole angle and the fluctuation of the sticking torque is therefore almost flattened. A front and a side view of the armature is given in figure 1 which I have added as an attachment.

Adriaan Kragten:
A new chapter 5 was added to report KD 718. The title of this chapter is: "Checking of the strength of the glue in between magnets and armature".

Adriaan Kragten:
A new chapter 6 has been added to report KD 718. The title of this chapter is: "Ideas about a bigger 16-pole PM-generator frame size 132".

Adriaan Kragten:
A new chapter 7 has been added to report KD 718. The title of this chapter is: "Ideas about a bigger 24-pole PM-generator using a 6-pole motor frame size 180L".

Adriaan Kragten:
A new chapter 8 has been added to report KD 718. The title of this new chapter is: "Ideas about a 30-pole PM-generator using a 6-pole motor frame size 100".
The advantage of using a 6-pole motor is that the armature volume is larger than for a 4-pole motor of the same frame size and stator length. The maximum torque level will therefore be larger too. The generator will have 180 preference positions per revolution which is also larger than the 144 preference positions for the 16-pole generator. So the fluctuation of the sticking torque will be flattened even more. The magnet orientation and the magnetic flux lines are given in figure 4 of KD 718. This figure is added as an attachment.

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