In this paper a new type winding of electrical machines--harmonic distribution winding hasbeen presented. This technique differs from the conventional one and it purposefully makes use of harmonic field in air gap generated by this winding for harmonic compensation or approach. In many applications

it has been proved that the limit of linearity in linear rotatory transformers may be broken by means of this winding and the linearity may be held on grade 0（±0.055% or ±2’）

in some products even up to ±0.02% or ±45". In this paper theory of this new winding and error regularity of these machines have been analyzed and test results provided.