SU1193752A1 - End-face contactless electric machine with combined excitation - Google Patents

Abstract

NON-CONTACT ELECTRIC MACHINE OF COMBINED EXCITATION, containing two end stator with working windings and a ring. excitation coil, mounted in a fixed magnetic core, and a two-pole rotor sized on a nonmagnetic shaft with 2p poles, containing two meters; ferrite insulative p-pole systems, opposite to the PSF of the core, one of which is made in the form of cores made of magnet. and a friend in the form of an axially magnetized permanent magnet, with the ends of which have washers made of a magnet of a soft material, characterized by. By reducing the mass and dimensions by increasing the concentration of a constant magnet flow in the air gap, the permanent magnet is made in the form of a ring, each washer of magnetically soft material is made with p-pole protrusions on the front side facing the stator, and the cores made of magnetically soft material are a clawed forslm with a common base along the outer diameter of the rotor and are turned smaller to the shaft. O9 SP y Fig1

Description

The invention relates to electrical engineering and concerns the implementation of electric machines, namely contactless electric machines with permanent magnets and an excitation winding, a combined excitation.

The aim of the invention is to reduce the size and weight of the device by concentrating the flow of a permanent magnet in the air gap.

Figure 1 shows the proposed electrical map, longitudinal section; figure 2 - the rotor from the end.

The device contains two end stator 1 and 2, installed in the side magnetic cores 3 and 4, which are interconnected by a magnetic core 5, an annular excitation winding 6, an electric machine rotor, located on a nonmagnetic shaft 7 and consisting of an axially magnetized permanent magnet 8, filled in the form of a ring, with the ends of which are set 9 and 10 of a magnet of some material, each having p pole protrusions on their end surfaces facing the stators.

Between the pole protrusions of the annular magnetic cores 9 and 10 are located P claw-shaped cores 1 and 12 with a common base 13 along the outer diameter of the rotor. The gap between the claw poles and pole lugs of washers 9 and 10 are filled with non-magnetic material.

The device works as follows.

When the excitation winding 6 is de-energized, the flow of the magnet, the passage through the washers 9 and 10, is concentrated in their pole lugs, enters the stators 1 and 2 and then closes mainly through the magnetic cores 3-5 and partially through the working gaps and air gaps and claw-like cores 11 and 12.

Due to the fact that the area of the end surfaces of the permanent magnet 8 is significantly larger than the area facing the stator pole protrusions on the washers 9 and 10, the induction in the air gap of the machine exceeds the corresponding number of times

induction in the body of the magnet, which increases the magnetic loads. and improves the use of the machine magnetic circuit.

When you turn on the winding 6 excite her ms.s. creates a flow, closing through stators 1 and 2, magnetic cores 3-5 and claw-like cores 11 and 12, having a common base 13 on the outer diameter of the rotor.

With increasing flow, closing through the claw-shaped cores 11 and 12, the emf increases. and this provides voltage regulation.

At a certain ppm induction in the air gap under the claw-shaped cores 11 and 12 reach the same high values as under the pole protrusions of 9 n 10. In this case, the use of the magnetic circuits of the proposed machine as a whole will be significantly higher than that of the known machine.

Thus, for the same conditions, with the optimal ratio of the internal diameter of the end package to the external order of 0.6-0.7 and a pole arc of 0.6 in the proposed design, magnetic induction in the air gap of the machine can be achieved, which is 4.55 times the induction in the body magnet, and in the known construction at the same time, the flow concentration is only 1.8-2.4 times

With higher magnetic loads and better use of the machine’s magnetic supply, it is possible to further reduce the volume of the machine by 15–20% compared with the known machine.,

At high concentrations of magnetic flux, high inductions can be obtained in the working gap at. the use of cheap magnets with low residual induction and high coercive force, for example, from ferite bari et al.

Thus, the invention allows an increase in the specific magnetic loads to reduce the size and weight of the machine, and at the same time creates the possibility of reducing the cost of the machine due to the use of cheap types of magnets.

FIG.

Claims (1)

SIDE-CONTACTLESS ELECTRIC COMBINED EXCITATION MACHINE, containing two end-face stator with working windings th-. a common field winding installed in a fixed magnetic circuit, and a rotor with 2p poles placed on a non-magnetic shaft, containing two magnetically insulated p-poles of a system opposite the polar magnet, from the ends of which washers of magnetically soft material are installed, which differs that, in order to reduce the mass and dimensions by increasing the concentration of the flux of the permanent magnet and the end face, facing the stator, and the soft magnetic material cores - claw forms a common base on the outer diameter of the rotor and smaller bases facing towards the shaft. , 1193752 Fig! 1! 93752