JPS63224640A - Rotor structure for high speed rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent the interference of a rotor with a stator at the time of rotating at an ultrahigh speed by reducing the size of the outer diameter of the outer peripheral wall of a section separated from both sides of the rotor smaller than that of the section at its both sides. CONSTITUTION:A turbine impeller 31 receives the energy of exhaust gas fed to a scroll 32 to be driven at a high speed, and a rotor 6 and a compressor impeller 21 are rotated through a shaft 5. When the rotating speed of the rotor 6 becomes an ultrahigh speed, the rotor 6 receives a strong centrifugal force. The radial deformation of a tube 62 near the section secured to an end plate 63 is small at this time, but the deformation of the outer periphery near the center separated from the plate 63 is large. However, since the size of the outer diameter of the section is reduced in advance by a predetermined size l, the contact of a stator core 71 with the inner periphery can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotor structure for a high-speed rotating electric machine driven by a high-speed turbine.

(Prior Art) A turbocharger has been developed that uses exhaust gas energy discharged from an internal combustion engine to drive a turbine having a compressor, and supercharges intake air of the internal combustion engine by operating the compressor. A patent application filed in 1980-1980 proposed an ultra-high-speed motor-generator in which a motor-generator was directly connected to the rotating shaft of this type of turbocharger and a permanent magnet was used as the rotor.
No. 095.

In such a turbocharger, the turbine rotation speed is 1
Therefore, the rotation speed of the rotor of the motor-generator directly connected to the rotating shaft of the turbine is driven to 100,000 RPM or more, and it operates as a generator.

(Problem to be Solved by the Invention) Since the rotor of the electric motor-generator in the above proposal rotates at an extremely high speed, the outer circumferential wall of the rotor deforms due to the influence of the centrifugal force, causing the rotor to radiate from the center axis of rotation. In order to prevent the rotor from deflecting in the direction and coming into contact with the stator, it is impossible to reduce the distance between the rotor and the stator. As a result of widening the distance between the rotor and the corresponding stator, the magnetic resistance corresponding to this distance increases, causing loss, resulting in a problem that the efficiency of the rotating electric machine is reduced.

The present invention has been made in view of the above problems, and its purpose is to reduce the outer diameter of a part of the outer peripheral wall of the rotor, which is driven to rotate at an ultra-high speed, to prevent interference with the stator at high ranges. An object of the present invention is to provide a rotor structure for a high-speed rotating electrical machine that prevents the above problems and improves the efficiency of the rotating electrical machine.

(Means for Solving the Problems) According to the present invention, in a rotor structure of a high-speed rotating electrical machine in which the outer peripheral wall and both side surfaces of a cylindrical rotor are covered with a high tensile strength material, both sides of the rotor are provided. A rotor structure for a high-speed rotating electric machine is provided in which the outer diameter of a portion of an outer peripheral wall remote from a surface is smaller than the outer diameter of portions on both side surfaces.

(Function) In the present invention, in a cylindrical rotor whose outer peripheral wall and both side surfaces are covered with a high tensile strength material, the outer diameter of the outer periphery of the portion away from both side surfaces is defined as the outer diameter of the portion on both side surfaces. Since it is made smaller, even if the outer circumferential wall near the center portion is deformed in the radial direction due to centrifugal force when the rotor rotates at an extremely high speed, the distance between the rotor and the stator is narrowed, but there is an effect of preventing contact.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a sectional view of a rotor showing an embodiment of the present invention, and FIG. 2 is a sectional view of a configuration of an example of a turbocharger with a rotating electric machine.

In Fig. 1.2, 1 is a turbocharger, 2 is a compressor housing, 3 is a turbine housing, and 4 is a center housing. Bearings 41 are provided at both ends of the center housing 4, and the bearings are supported by the bearings 41. A shaft 5 is rotatably provided. Reference numeral 42 is a lubricating oil passage, which supplies oil to the bearing 42.

A compressor impeller 21 and a turbine impeller 31 are attached to both ends of the shaft 5, and are housed inside the compressor housing 2 and turbine housing 3, respectively.

The turbine impeller 31 rotates upon receiving the energy of the exhaust gas sent to the scroll 32, rotates the compressor impeller 21 via the shaft 5, and rotates the compressor impeller 21 through the shaft 5.
The diffuser 23 converts the pressure of the air introduced through the diffuser 23 and sends it under pressure to the cylinders of the engine (not shown).

6 is a compressor impeller 21 and a turbine impeller 31
It is a cylindrical rotor attached to the shaft 5 between the rotor and the rotor, and has a permanent magnet 61, a tube 62, and an end plate 63.

The permanent magnet 61 is formed of a laminate of hollow disk-shaped magnetic materials containing, for example, a rare earth element, and is magnetized so as to radiate strong lines of magnetic force in the radial direction.

A high-tensile, thin-walled tube 62 made of, for example, a titanium alloy is press-fitted into the outer periphery of the strong permanent magnet 61.
An end plate 63 made of a high tensile strength material is adhered to the outer surface of the stacked permanent magnet 61, and the end plate 63 is strongly fixed to the tube 62 by, for example, welding to prevent the rotor 6 from rotating at high speed. This prevents deformation and damage due to centrifugal force.

Further, the outer diameter of the tube 62 near the center in the longitudinal direction is smaller than the outer diameter near the end plate 63 by a predetermined dimension λ (for example, 20 to 100 μ).

A stator 7 serves as a stator corresponding to the rotor 5, and includes a stator core 71 made of a high-frequency magnetic material and a stator coil 72 wound around the stator core 71. The corresponding spacing between the stator core 71 and the rotor 5 is formed at a predetermined narrow spacing, so that the mutual magnetic resistance is reduced.

In this embodiment having such a configuration, the turbine impeller 31 is driven at high speed by receiving the energy of the exhaust gas sent to the scroll 32, and rotates the rotor 6 and the compressor impeller 21 via the shaft 5. . The compressor impeller 21 compresses the air introduced from the intake pipe 22 and sends it under pressure to the cylinders of the engine, thereby increasing the engine output.

On the other hand, the rotor 6 causes a high-frequency magnetic flux change in the stator core 71 by high-speed rotation of the permanent magnet 61, and induces a high-frequency current in the stator coil 72. Also rotor 6
When the rotational speed of the tube becomes extremely high, the rotor 6 is subjected to a strong centrifugal force, so the deformation of the tube 62 in the radial direction near the part fixed to the end plate 63 is small, but the central part away from the end plate 63 The amount of deformation of the nearby outer circumferential portion increases, and the outer diameter of that portion becomes a predetermined dimension 1.
Since this is a subtraction by only 1, it is possible to prevent contact with the inner periphery of the stator core 71. Therefore, even when the rotation speed of the rotor 6 exceeds 100,000 RPM, the rotor 6 rotates at high speed without interference from the stator, and high frequency power is generated more efficiently than the stator coil 72.

In addition, as mentioned above, this embodiment has been explained as a generator operation of a rotating electric machine, but as a motor operation, the stator coil 72
By supplying a predetermined high frequency power to the rotor 6, the rotor 6 is driven at extremely high speed, and by operating the compressor blades 21, it is possible to supply supercharging air to the engine.

Further, when the tube 62 is attached to the stacked permanent magnets 61 of the rotor 6 of this embodiment, an absorber made of an elastic body may be interposed between the two to prevent the generation of a gap between the two.

The embodiments in which the present invention is used in a turbocharger have been described above, but various modifications can be made within the scope of the invention, such as applying it to the rotor of a rotating electric machine used in other high-speed turbines. , these are not excluded from the scope of the present invention.

(Effects of the Invention) In the present invention, the outer diameter of the outer circumferential wall in the vicinity of the central portion away from both side surfaces of the cylindrical rotor is made smaller than the outer diameter of both side portions. Since the bulge due to deformation in the vicinity is taken into consideration, interference between the rotor and stator can be prevented during ultra-high speed rotation, and since there is no need to widen the gap between the rotor and stator, the magnetic field in the gap area can be prevented. Loss due to resistance can also be minimized, which has the effect of providing good efficiency as a rotating electric machine.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotor showing one embodiment of the present invention, and FIG.
The figure is a sectional view showing an example of a turbocharger with a rotating electric machine. 1...turbocharger, 6...rotor, 7...
Stator, 61... Permanent magnet, 62... Tube,
63... End plate.

Claims (1)

[Claims] In a rotor structure of a high-speed rotating electrical machine in which the outer circumferential wall and both side surfaces of a cylindrical rotor are covered with a high tensile strength material, the outer diameter dimension of the outer circumferential wall at a portion away from both side surfaces of the rotor is A rotor structure for a high-speed rotating electric machine characterized by having a diameter smaller than the outer diameter of the parts.