JPH11187618A - Turbogenerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To assure desired generated output without applying a large centrifugal force to the permanent magnet of a rotor. SOLUTION: A first rotor constituted of a permanent magnet 24 fixed on a rotating shaft 23 driven to be rotated by a turbine rotor 25, a case 11 which is rotatably supported by housings 12, 14 and accommodates the first rotor, and a second rotor constituted of a magnetic member 21 fixed to a case 1, while covering the outer periphery of the first rotor so as to keep a specified small gap, and a coil 22 wound around the magnetic member 21 are installed. The case 1 is made to rotate in a direction opposite to the rotating direction of the rotating shaft 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbocharger in which a generator is arranged on a rotating shaft of a turbine rotor driven by exhaust gas of an engine and the exhaust energy is to be recovered as electric energy.

[0002] It relates to a generator.

2. Description of the Related Art Turbochargers are widely used in which exhaust energy of an engine is guided to a turbine rotor to rotate at high speed, and a compressor rotor connected to a rotating shaft of the turbine rotor is driven to rotate to supply supercharged air to the engine. In recent years, various types of turbo generators have been proposed in which a generator is arranged on a rotating shaft of the turbo charger and exhaust energy is recovered as electric energy.

In this type of turbo generator, the generator is composed of a rotor composed of a permanent magnet fixed on a rotating shaft and an iron fixed to a housing so as to cover the outer periphery of the rotor with a predetermined gap. And the like, and a stator composed of a coil wound around the magnetic member.The rotor rotates within the stator with the rotation of the turbine rotor, so that the stator coil An AC current is generated by the exciting action, and the AC current is charged to the battery via the power converter. Here, since the turbine rotor generally rotates at an ultra-high speed of 100,000 rpm or more, CFRP, SU, or the like is used so that the permanent magnet of the rotor is not broken by centrifugal force.
The outer periphery of the permanent magnet may be covered with a reinforcing ring made of a non-magnetic material such as S.
And Japanese Unexamined Patent Publication No.
735 proposes this.

[0004]

In the turbo-generator having the above-described structure, the generated power is determined by the changing ratio of the magnetic flux generated between the rotor and the stator. However, as disclosed in the above publications, when the outer circumference of the permanent magnet of the rotor is covered with the reinforcing ring, the gap between the permanent magnet and the stator (magnetic member) cannot be reduced. As a result, there is a problem that the magnetic flux is hindered, which becomes a hindrance factor for improving the power generation.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to secure a desired power generation without a large centrifugal force acting on the permanent magnet of the rotor in the turbo generator.

[0006]

According to the present invention, there is provided a turbo generator that is rotatable in a housing and an exhaust energy of an engine in the housing. A turbine rotor disposed and rotatably supported by the housing;
A rotating shaft to which the turbine rotor is fixed at one end,
A first rotor made of a permanent magnet fixed on the rotating shaft, a case rotatably supported by the housing and accommodating the first rotor therein, and a case of the first rotor in the case. Rotating the case in a direction opposite to the rotation direction of the rotating shaft, and a second rotor including a magnetic member fixed to cover the outer periphery with a predetermined small gap and a coil wound around the magnetic member; And a driving means.

In the above means, the driving means includes:
The engine may transmit the rotational power via a power transmission member, and the second rotor is desirably connected to a battery via a slip ring provided on the housing.

According to the above means, the first rotor and the second rotor
Since the rotors rotate relative to each other, a large centrifugal force does not act on the permanent magnets of the first rotor under a low actual rotation speed of the first rotor, so that it is possible to secure the same magnetic flux change ratio as before. And a desired power generation can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a turbo generator according to the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes an engine, which is a prime mover of a vehicle, or a power source of a main generator (not shown) in an electric vehicle. A turbo generator 20 is connected to the exhaust pipe 3 of the engine 1. 1 and 2, a turbo generator 20 includes a first housing 12 fixed to the engine 1 and a bearing 1 on the first housing 12.
Rotating shaft 23 rotatably supported via 6b, 16c
Is fixed to one end of the turbine housing 13 and is housed in a turbine housing 13 coupled to the first housing 12.
A second housing connected to the first housing via a plurality of connecting rods; a recess formed on a side surface of the second housing on the first housing side; A cylindrical case 11 rotatably supported at both ends thereof via bearings 16a and 17 is provided on the outer periphery of a cylindrical portion formed on the side surface of the housing 14.

One end of the cylindrical case 11 is closed, and a bearing 16 is formed at a shaft formed at an outer end of the closed portion.
The pulley 11a through which the power of the engine 1 is transmitted via the crank pulley 9 and the belt 10 is formed integrally with the second housing 14 so as to be rotatable by a. Have been. This allows
The case 11 is configured to rotate in a direction opposite to the rotation directions of the rotating shaft 23 and the turbine rotor 25.

A magnetic member 21 extending in the axial direction is press-fitted and fixed to the inner peripheral surface of the cylindrical portion of the case 11. Magnetic member 21
Is formed by laminating magnetic steel plates or the like, and a plurality of coils 22 (three phases in this embodiment) are wound around the outer periphery thereof in the axial direction. The magnetic member 21 and each coil 22 are
It is a 2nd rotor in this invention. An end of each coil 22 penetrates a closed portion of the case 11 and is electrically connected to a slip ring 26 provided between the closed portion and the second housing 14. The slip ring 26 is connected to the battery 6 via a power converter 5 including an AC / DC bidirectional converter including an inverter and a converter.

A rotating shaft 23 extending to the inner peripheral side of the magnetic member 21
A permanent magnet 2 that constitutes a first rotor
4 is fixed so as to rotate integrally with the rotation shaft. The permanent magnet 24 is fixed to the rotating shaft 23 so as to maintain a predetermined small gap between the outer periphery thereof and the magnetic member 21 and has the same axial length as the magnetic member 21. When driven and rotated on the inner peripheral side of the magnetic member 21, an alternating current is generated by an exciting action in each coil 22 wound around the magnetic member 21. In FIG. 1, reference numeral 7 denotes a throttle valve disposed in the intake pipe 2, which is opened and closed by a throttle actuator (not shown) according to a signal from the controller 4. Also, 8
Detects the intake pressure of the engine with a pressure sensor and sends a detection signal to the controller 4. Although not shown, a rotation sensor for detecting the rotation speed of the crankshaft of the engine 1 is attached, and a detection signal is sent to the controller 4.

The operation of the embodiment having the above configuration will be described.

When the engine 1 is started, the turbine rotor 25 is rotated by the exhaust energy, and the permanent magnet 24 fixed to the rotating shaft 23 rotates while maintaining a predetermined gap with the magnetic member 21. As a result, the magnetic flux generated between the permanent magnet 24 and the magnetic member 21 changes, so that each coil 22
, An AC current is generated by the exciting action, and the AC current is supplied to the battery 6 via the slip ring 26 and the power converter 5, and the battery 6 is charged.

On the other hand, when the engine 1 is started, the rotational power of the engine 1 is transmitted to the case 11 via the crank pulley 9, the belt 10, and the pulley portion 11a, and the case 11, the magnetic member 21 and the coil 22 rotate. The shaft 23 and the permanent magnet 24 are rotated in a direction opposite to the rotation direction. As a result, the rate of change of the magnetic flux, which determines the power generation, increases, and a large power generation can be obtained at a low rotation speed of the rotating shaft 23 and the permanent magnet 24. Therefore, a large centrifugal force does not act on the permanent magnet 24 under the low actual rotation speed of the permanent magnet 24, and a desired power generation can be obtained while securing the same magnetic flux change ratio as in the related art.
No reinforcing ring for reinforcing 4 is required, and the power generation efficiency can be improved.

Although the centrifugal force acting on the permanent magnet 24 increases in accordance with the rotation of the turbine rotor 25, although not shown, a bypass pipe provided in the exhaust pipe 3 so as to bypass the turbine rotor 25. Is opened and closed according to the rotation speed of the engine 1, for example, to limit the centrifugal force.

In the above-described embodiment, the rotational power of the engine 1 is transmitted through the belt 10 in order to rotationally drive the case 11, but, for example, the case 11 is configured to be rotationally driven by a motor. It is also possible to implement the invention. In this case, the motor is a permanent magnet 2
4 is configured to increase the rotation of the engine according to the engine speed up to a predetermined engine speed, which can withstand the centrifugal force, and to limit the rotation when the engine speed exceeds the predetermined engine speed. It is desirable to do.

[0019]

As described above, according to the present invention, since the first rotor and the second rotor rotate relative to each other, the permanent magnet of the first rotor can be operated under a low actual rotation speed of the first rotor. Without a large centrifugal force acting on the magnetic field, it is possible to secure the same magnetic flux change ratio as before, and it is possible to obtain a desired power generation. Therefore, the reinforcing ring for reinforcing the permanent magnet can be eliminated as in the related art, and a predetermined small gap is secured between the first rotor (permanent magnet) and the second rotor (magnetic member and coil). Therefore, it is possible to improve the power generation efficiency of the turbo generator.

Further, by eliminating the reinforcing ring, the load acting on the bearing that supports the rotating shaft can be reduced, and the durability of the bearing can be improved.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of an embodiment of a turbo generator according to the present invention.

FIG. 2 is an enlarged explanatory view of the turbo generator in the embodiment of FIG.

[Explanation of symbols]

 Reference Signs List 1 engine 4 controller 5 power converter 6 battery 9 crank pulley (drive means) 10 belt (drive means) 11 case 11a pulley portion (drive means) 12 first housing (housing) 13 turbine housing 14 second housing (housing) 14b Cylindrical part (load reduction means) 20 Turbo generator 21 Magnetic member (second rotor) 22 Coil (second rotor) 23 Rotary shaft 24 Permanent magnet (first rotor) 25 Turbine rotor 26 Slip ring

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02K 21/10 H02K 21/10

Claims (3)

[Claims] 1. A housing, a turbine rotor rotatably disposed in the housing by exhaust energy of an engine, and a rotating shaft rotatably supported by the housing and having one end fixed to the turbine rotor. A first rotor made of a permanent magnet fixed on the rotating shaft;
A case rotatably supported by the housing and accommodating the first rotor therein, a magnetic member fixed to the case so as to cover the outer periphery of the first rotor with a predetermined small gap, and A turbo generator comprising: a second rotor composed of a coil wound around the magnetic member; and driving means for rotating the case in a direction opposite to a rotation direction of the rotating shaft. 2. The turbo generator according to claim 1, wherein the drive unit is the engine that transmits its rotational power via a power transmission member. 3. The turbo generator according to claim 2, wherein the second rotor is connected to a battery via a slip ring provided on the housing.