JPH05254488A - Drive device for double reversing propeller - Google Patents

Abstract

PURPOSE:To provide a double reversing propeller which is reduced in its size and available for sharply reducing a space for a pusher chamber. CONSTITUTION:In a drive device for a double reversing propeller wherein propellers 5 and 6 are arranged to inner and outer shafts 3 and 4 which are coaxially arranged and the propellers 5 and 6 are rotated in a reverse direction to each other, the stator 11 of an induction motor is rotatably supported on the fixing side, and the outer and inner shafts 4 and 3 are coupled to the stator 11 and a rotor 13, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a contra-rotating propeller mounted on a ship, and more particularly to an electric drive device capable of directly driving the contra-rotating propeller.

[0002]

2. Description of the Related Art Generally, an electric propulsion system is often used for passenger ships, oil rigs, etc. due to restrictions such as noise and height of a propulsion chamber. Even in a ship that adopts the electric propulsion system as described above, if a contra-rotating propeller is installed in place of the one propeller that is normally equipped, propulsion efficiency can be improved, and the output of the propulsion motor and the generator that is the power supply can be improved. Can be expected to reduce. Therefore, in recent years, application of a counter-rotating propeller to an electric propulsion ship has been desired.

As shown in FIG. 3, a counter-rotating propeller conventionally applied to a ship is attached to one end of a counter-rotating shaft 9 so that a driving force from an engine 1 can be controlled by a planetary gear unit 2. The heavy reversing shaft 9 is transmitted to the inner shaft 3 and the outer shaft 4, respectively, and is driven by reversing the inner shaft 3 and the outer shaft 4 from each other.

[0004]

However, since the conventional drive unit uses the mechanical rotation converting mechanism such as the gear unit 2, the electric propulsion ship does not lose its original characteristics. Cannot be applied to. As a device for directly driving the contra-rotating propeller without using the gear device 2, electric motors 7 and 8 are connected to an inner shaft 3 and an outer shaft 4, respectively, as shown in FIG.
It is conceivable to drive the outer shaft 4 by the other electric motor 8, but since the two electric motors 7 and 8 are arranged side by side, they are relatively large and have a large propulsion chamber space.

Therefore, an object of the present invention is to provide a contra-rotating propeller drive device which can be downsized and which can significantly reduce the space of the propulsion chamber.

[0006]

In order to achieve the above-mentioned object, the present invention provides a contra-rotating propeller in which propellers are provided on an inner shaft and an outer shaft, which are coaxially arranged, and these propellers rotate in mutually opposite directions. In the drive unit, the stator of the induction motor is rotatably supported by the fixed system, and the outer shaft and the inner shaft are connected to the stator and the rotor, respectively.

[0007]

According to the above structure, the stator of the induction motor is rotatably supported. Therefore, when a rotating magnetic field is generated by this stator, the stator and the rotor act in opposite directions due to action and reaction. Rotate. Therefore, by rotating the outer shaft and the inner shaft in accordance with the rotation of the stator and the rotor, the contra-rotating propeller can be driven by only a single electric motor.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a drive device for a contra-rotating propeller according to this embodiment. In the figure, reference numerals 5 and 6 denote propellers that are arranged side by side on the same axis in the front-rear direction, and these propellers 5 and 6 are attached to one end of the counter-rotating shaft 9. The counter-rotating shaft 9 is composed of an inner shaft 3 and a cylindrical outer shaft 4 surrounding the inner shaft 3, and the inner shaft 3 has a propeller 5 on the rear side.
And a front side propeller 6 is attached to the outer shaft 4. At the other end of the counter-rotating shaft 9, an induction motor 10 for driving the propellers 5 and 6 in opposite directions is installed. The stator 11 of the induction motor 10 is rotatably supported by a fixed system (not shown), and the outer shaft 4 is connected to the stator (hereinafter, referred to as an outer rotor) 11 and the rotor (hereinafter, referred to as an inner rotor). The inner shaft 3 is connected to the so-called child 13.

The outer rotor 11 is formed in a cylindrical shape so as to surround the inner rotor 13, and an annular output shaft 11a provided at one end thereof and a projecting shaft 11b provided at the other end thereof are bearings 14 and 15 respectively. Is rotatably supported by a fixed system (not shown). A winding 12 is mounted in a slot formed on the inner peripheral surface of the outer rotor 11, and this winding 12 is a slip ring 16 fitted to the protruding shaft 11b.
Is electrically connected to. The slip ring 16 is provided to supply power to the winding 12, and is in electrical contact with the brush 17 provided in the fixed system. The slip ring 16 is connected to the brush 17 and the slip ring 16 from an AC power source (not shown). AC power can be supplied. The inner rotor 13 has a cage shape like a general induction motor, and the output shaft 13a at one end is inside the output shaft 11a of the outer rotor 11, and the protruding shaft 13b at the other end is the outer rotor 11. Are rotatably supported in the groove 11c via bearings 18 and 19, respectively. The outer shaft 4 and the inner shaft 3 of the counter-rotating shaft 9 are directly connected to the output ends 11a and 13a of the rotors 11 and 13, respectively.

Next, the operation of this embodiment will be described.

When driving the pair of propellers 5 and 6, an AC current is supplied from an AC power supply (not shown) to the winding 12 through the brush 17 and the slip ring 16. As a result, a rotating magnetic field is generated between the winding wire 12 and the inner rotor 13, the rotating magnetic field gives a rotating force to the inner rotor 13, and the rotor 13 starts rotating. At the same time, a reaction force is applied to the outer rotor 11, but at this time, the outer rotor 11 is in a state of being freely rotatable, so that the rotor 11 also starts rotating in the opposite direction to the rotor 13. The rotations of the outer rotor 11 and the inner rotor 13 are transmitted to the inner shaft 3 and the outer shaft 4, respectively, whereby the front and rear propellers 5 and 6 rotate in mutually opposite directions,
Propulsion force will be generated in the same direction.

As described above, according to this embodiment, since the stator 11 of the induction motor can be freely rotated,
Only one induction motor 10 can drive the propellers 5 and 6 in reverse. Therefore, there is no need to use a gear device or two electric motors as in the conventional case, the drive device can be downsized, and the space of the propulsion unit chamber can be significantly reduced. Therefore, it becomes possible to easily equip an electric propulsion ship with a counter-rotating propeller for an electric propulsion ship that has a limited height in the propulsion chamber, improve propulsion efficiency of the electric propulsion ship, and reduce the output of the power generation system that is a motor power source. be able to.

Further, since the stator 11 of the induction motor 10 of this embodiment has half the number of poles as compared with the stators of the motors 7 and 8 in the conventional two-motor system (FIG. 2), the motor 10 itself. Can be miniaturized as much as possible. That is, the rotation speed of the stator 11 doubles the rotation speed relative to the rotor 13 as compared with the rotation speeds of the conventional electric motors 7 and 8. Therefore, in order to obtain the same rotation speed at the same frequency, The winding wire 12 may be provided so that the number becomes 1/2.

Further, in this embodiment, the slip ring 16 is provided on the stator 11 and the brush 17 is electrically contacted with the slip ring 16 to supply electric power.
Even during the rotation of 1, the power supply to the winding wire 12 can be reliably ensured.

Further, since the induction machine is used, a slip ring and a brush for the inner rotor 13 are unnecessary.

[0017]

In summary, according to the present invention, the stator of the induction motor is rotatable, and the stator and the rotor of the motor are made to rotate in reverse by utilizing the action and reaction. The drive device of the reversing propeller can be miniaturized as much as possible, and the space of the propulsion unit room in the ship can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a contra-rotating propeller drive device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a contra-rotating propeller drive device using a two-motor system.

FIG. 3 is a view showing a conventional contra-rotating propeller drive device.

[Explanation of symbols]

 3 Inner shaft 4 Outer shaft 5,6 Propeller 9 Double reversal shaft 10 Induction motor 11 Outer rotor (stator) 12 Winding 13 Inner rotor (rotor) 14,15 Bearing 16 Slip ring 17 Brush

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hironobu Nakajima 1-1-1, Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Ltd. Tokyo No. 1 Factory

Claims (2)

[Claims] 1. In a contra-rotating propeller drive device in which a propeller is provided on each of an inner shaft and an outer shaft which are coaxially arranged, and these propellers are rotated in opposite directions, a stator of an induction motor is rotatably supported by a fixed system. A drive device for a contra-rotating propeller, which supports and connects the outer shaft and the inner shaft to the stator and the rotor, respectively. 2. The contra-rotating propeller drive device according to claim 1, wherein the stator has a slip ring for supplying electric power.