SU1436209A1 - Electric machine - Google Patents

Abstract

The invention relates to electrical engineering, namely to electric machines with excitation from permanent magnets. The purpose of the invention is to improve the use of active materials and simplify the design. The electric machine contains a stator with a winding, an inductor 1 with a non-polar and 2 poles, and radially magnetized prismatic permanent magnets 3. Poles 2 and permanent magnets 3 are installed with side-to-side adhesion. In. ° - arc of permanent magnets is more pole arc-magnetic-soft poles by 0.5-1., About the length of the air gap. In the proposed design, the permanent magnets are fastened with no special fasteners. § 2 Cp. f-ly, 3 ill.

Description

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The invention relates to electric machines, namely, Excitation from permanent magnets.

The purpose of the invention; .tennas - improving the non-use of active materials of the machine, as well as simplifying the design.

FIG. G presents the plot of the vector, cross section; 2 shows the pole system of the inductor, in which the width of the magnets is larger than the soft magnetic poles; on fig.Z - placement of magnets in the inductor.

The electric machine contains a stator with an alternating current winding (not shown), an inductor 1 with non-winding poles 2 of magnetically soft and radially magnetized prismatic permanent magnets 3, Poles 2 and permanent magnets 3 are mounted on the inductor 1 with adjoining side edge 4. The pole arc of permanent magnets 3 can be made larger than the pole arc of soft magnetic poles 2 by 0.5-1.0 times the air gap between the stator and inductor 1. The permanent magnets 3 can be made in cross section inductor t rappeal shape with a smaller base of the trapezoid facing the air gap.

The electric machine operates, for example, as a generator as follows.

When the inductor rotates, the magnetic flux created by the permanent magnet 3 induces a variable EMF in the alternating current winding of the stator. When the stator winding closes the load

a current flows through it.

40

The inductor can have two options for magnetizing the inductor poles: the magnetic potentials of the active surfaces of the neighboring poles are equal (or rather close) in magnitude but opposite to the sign (magnetoelectric machines, main types of combined excitation machines) and the magnetic potentials of the active surfaces of the neighboring poles are equal in magnitude and the sign of en (pole-switchable synchronous machines of the combined excitation or when working with a smaller number of pluses).

Due to the fact that modern permanent magnets, especially rare55

magnetization vector (elementary contours of molecular currents) has a rigid spatial orientation along the longitudinal

five

0

with n

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the axes, even in the first case, the transverse component of the magnetic flux of the scattering (the flux of scattering from the poles of the lateral faces of the magnets 3) is insignificant and this is manifested only in the fact that the transition lines of the flow of air through the zero value do not lie at the pole boundaries 2 and the magnets 3j a are slightly displaced to the longitudinal axes of the magnets 3. The main part of the flow of the magnet 3 closes through the working air gap, along the stator back (not shown) and the inductor 1. Due to the absence of polar poles in the pole system 2 and 3, and corresponding present an increase in the active surfaces of the poles of the magnets 2 and 3 of magnitude working stream and its first harmonics are increased, which leads to improved use iyk active material and the weight and size characteristics of the machine.

In the second variant of the magnetization of the inductor 1, the scattering flow almost disappears and the magnetic induction on the entire surface of the poles 2 and magnets 3 is the same, and since there are no moving parts, the magnetic flux of the interstore 1 increases; , which also improves the use of active materials. Therefore, in particular, when a synchronous pole-switched machine with a number of dasses works, the resulting magnetic flux increases and the weight and size characteristics of the proposed machine are improved compared to the known ones. For the content of the first harmonic of the magnetic noTdka pole. the arc of permanent magnets 3 is made larger than the pole arc of poles 2, You-. Filling the inductor without interpolar spaces simplifies the design, since the permanent 3 is held in it by the wedge connection and does not require the use of special fasteners.

Claims (3)

Formula of inventions An electric machine containing a stator, an inductor installed in it with an air gap, with alternating circumferentially free-flow poles of magnetic soft material and radially magnetized prismatic permanent magnets, different from. In order to improve the use of active materials and to simplify the design, permanent magnets and magnetic poles are fitted along side faces. 2, Machine pop.1, characterized in that the pole pole of the permanent magnets is made larger than the pole arc of the soft magnetic pole. four 1.0 length of air 3. Machine No. 1 and 2, which is tlicitous in that the permanent magnets in the transverse section are trapezoidal in shape and mounted with smaller bases of the trapezium towards the air gap. 1 Fig.z