SU1257769A1 - D.c.electric machtne - Google Patents

Abstract

The invention relates to electric machines with excitation from permanent magnets. The purpose of the invention is to increase the service life by improving the switching. Inductor 3 creates a workflow in the machine. A cylinder of magnetic material on the outer surface of the core 2 creates uniform magnetic conductivity. flow, smoothing edge effects that occur along the edges of the crowns of the teeth. The induction distribution in the gap becomes smoother, which improves the switching of the machine. In transient conditions, cylinder 1 damps the core field, thereby reducing the demagnetizing effect of the field of the core on the magnet. 1 il. 2 (L SL Hj 0 WITH

Description

"1257769

This invention relates to electro-engineering.

The purpose of the invention is to increase service by improving switching.

The drawing shows a negative 5 ina.

ma owner vp n zl h m v

In the proposed device, a cylinder 1 of magnetic material on the outer surface of the core 2 creates uniform conductivity to the magnetic flux of the inductor 3, smoothes the edge effects that occur along the edges of the tooth crowns. The distribution of the induction in the gap becomes smoother, and its magnitude in the switching region decreases sharply. In addition, the cylinder closes the field cor 2, and in transient conditions (start, reverse, a sharp increase in load) damps. this reduces the demagnetizing effect of the field of the core on the magnet. Therefore, the cylinder must have good electrical conductivity. In order to reduce the eddy currents, the cylinder 1 is made up of steel sheets (laminated) or twisted in the form of a spring from a steel strip and use wire. The thickness of the cylinder is selected from the conditions of the complete closure of the field core and the minimum decrease in the inductor flow, which partially closes along the cylinder, mine conductors of the winding core. Cylinder thickness

) (UofUMTDoNtJafD-dl

2a-K, (((Dtc3) + 8 | U “S- (D-J)

de CD - magnetic permeability

 § vacuum, GN / m;

and the magnetic permeability of the magnet at the point of its demagnetization curve, GN / m; Pq outer diameter of core, m-; N is the number of winding conductors

cor;

Jg - rated current of the machine, A |

D is the external diameter of the magnet, m; c1 is the internal diameter of the magnet,

m; 2o number of parallel branches

winding core I

kj, is the coefficient of filling the cylinder with steel. With a solid ring KC 1;

the magnitude of the one-sided air gap between the core and the magnitude of the gas, m; number of grooves

Performing a core with a cylinder of magnetic material on the outer surface reduces the demagnetizing effect on the permanent magnet of both the transverse and switching core reaction, which makes it possible to more efficiently use a permanent magnet and increase the energy performance of the machine. The uniform distribution of induction in the gap allows to improve switching, therefore, to increase the service life, improve the quality and reliability of the product. With the use of the device, the core grooves can be made open. To hold the conductors in the grooves, no wedges or other devices are required, which reduces the labor intensity of the winding operations, increases the useful groove area, increases the manufacturability of the machine as a whole.

Claims (3)

Invention Formula An electric DC machine, containing an external ring magnet and toothed measles with a winding, characterized in that, in order to increase service life by improving switching, the measles are placed inside a hollow thin-walled cylinder of magnetic material, and the thickness b of the cylinder is determined by ratio: 40 . (Wo lJj 7DgN3a (D- (j) 2a.Kc (i ,, (D + .Z (D-d) where (Ufl - magnetic permeability of vacuum; / 4 - magnetic permeability of the magnet; outer diameter of the core; the number of conductors of the winding core; rated current; outer diameter of the magnet; internal diameter of the magnet; the number of parallel branches of the winding; KC fill factor qi. lindra steel; B - the size of the air gap ;. DO- Nf 3. D d 2ci g number of slots box.