HARMONISING METHOD OF MAGNETIC CONDUCTORS OF ROTOR AND ARMATURE IN TWO-DIMENSIONAL ELECTRIC MACHINES - GENERATORS Russian patent published in 2013 - IPC H02K15/00 H02K23/44 G01R31/34 

FIELD: electricity.

SUBSTANCE: harmonising method of magnetic conductors or rotor and armature in DEM-G, which are made using magnetic conductors of armature with brush-collector assembly of direct current machines and stator of alternating current machines, which is used as external rotor, is characterised by the fact that initial existing air gap δ_I is determined between rotor and armature by the following formula: δ_I=(Dr-Da)/2, where Dr - rotor inner diameter, Da - armature outer diameter; then, necessary final air gap δ_kp is calculated by the following formula: $${\delta }_{kp}\approx (\mathrm{0,27}÷\mathrm{0,33})\cdot {10}^{-6}\frac{A}{B_{\delta o}}\cdot \frac{\tau }{x_d{}_{*}},$$ , where A - linear load, B_{δ o}≈0.95 B_{δ nom} - maximum induction in air gap at idle stroke and nominal voltage, τ - polar pitch, x_d* - synchronous inductive resistance along longitudinal axis, difference Δ = δ_I - δ_kp={[(Dr-Da)/2]-δ_kp} is found between initial air gap δ_I and design end air gap δ_kp; then, cylindrical surface of armature is increased along outside circumference by covering it with one or more layers of electrical steel plates and by bringing total thickness of layers of electrical steel plates to the value that is equal to calculated difference Δ, thus providing expedient end air gap δ_K≈δ_kp between rotor and armature from the point of view of power. Electrical steel on armature surface is fixed by spot welding.

EFFECT: increasing energy indicator ηcosφ of two-dimensional electric machines.

2 cl, 3 dwg