JP2509096Y2 - Electric motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electric motor that is connected between a prime mover and a load to drive the load.

(Prior Art) Conventionally, for example, a three-phase synchronous electric motor (hereinafter, referred to as an electric motor) that is connected to an output shaft of a diesel engine (hereinafter, referred to as a prime mover) by a coupling and rotates a propeller for ship propulsion together with the prime mover is there.

This electric motor, on the one hand, applies the propulsive force of the prime mover and, on the other hand, is also used as a generator for recovering surplus energy during deceleration of the ship.

(Problems to be solved by the invention) However, in the electric motor used for such an application,
Since both ends of the rotary shaft are connected to the prime mover and the propeller shaft, if a failure occurs in the bearing, the prime mover must be stopped as well as the ship until the bearing is repaired.

In addition, the rotating shaft of the electric motor must use an elastic coupling or the like at the connecting portion with the prime mover or the propeller shaft in order to release the axial extension due to heat during operation.

Then, not only the structure of the connecting portion becomes complicated, but also the reliability of the power transmission system may deteriorate.

Therefore, an object of the present invention is to provide an electric motor capable of independently repairing the load without stopping for a long period of time even if the bearing of the electric motor fails, thereby improving the reliability of the power transmission system. Is to get.

(Means for Solving the Problems) The present invention relates to an electric motor in which an output shaft of a prime mover is connected to one side of a rotary shaft and a load is connected to the other side of the rotary shaft, the rotary shaft is hollow, and the rotary shaft is penetrated. Insert the shaft loosely, connect the output shaft of the prime mover to one side of the through shaft, connect the other side of the rotary shaft to one side of the other side of the through shaft, and connect the load to the other side of the other side of the through shaft. Is characterized by.

(Operation) The rotary shaft of the electric motor and the output shaft of the prime mover are directly connected to the load via the other side of the through shaft, and therefore the rotary shaft can be disconnected regardless of whether the prime mover is connected to the load. Become.

(Embodiment) An embodiment of the electric motor of the present invention will be described below with reference to the drawings.

 FIG. 1 is a vertical sectional view showing an electric motor of the present invention.

In the figure, a through hole 2b is coaxially provided in the shaft center of the rotor shaft 2 of the electric motor 1, a slide bearing 9a is inserted on the left side of the rotor shaft 2, and an insulating slide bearing 9b is inserted on the right side thereof. Supported by a bearing 9.

Further, a salient pole type rotor core is provided at the center of the rotor shaft 2.
2c is fixed, and the stator core 1a is fixed to the outer circumference of the rotor core 2c at the inner circumference of the outer core.

Further, at the left end of the rotor shaft 2, an annular flange portion 2a
The through shaft 5 having the flange portion 5a formed at the left end is loosely inserted from the left side inside the through hole 2b of the rotor shaft 2.

The flange portion 5a at the left end of the penetrating shaft 5 is fastened to the flange portion 2a by a plurality of reamer bolts 6 penetrating the flange portion 2a of the rotor shaft 2 and press-fitted from the outside.

Further, on the left side surface of the flange portion 5a, a flange portion at the right end of the drive shaft 3 for driving a propeller for propelling a ship (not shown).
3a is connected and fixed by a plurality of reamer bolts 6.

On the other hand, a coupling 5b is fixed to the right end of the penetrating shaft 5 protruding from the right end of the rotor shaft 2 via a key (not shown), and a driving motor (not shown) installed on the right side of the electric motor 1 is attached to the coupling 5b. Flange part 4a at the left end of the output shaft 4 of
Are connected by a plurality of reamer bolts 6.

In the motor constructed in this way, the stator core
The rotating force of the rotor shaft 2 generated between 1a and
By being transmitted to the drive shaft 3 via 2a, 5a, 3a, a propeller (not shown) is driven via the penetrating shaft 5 and the drive shaft 3 to apply a propulsion force of a prime mover (not shown) for propelling the ship.

When a failure occurs in the bearing 9 of the electric motor 1 or the rotor winding (not shown) of the rotor core 2c, the prime mover (not shown) is temporarily stopped to remove the reamer bolt 6 between the flanges 2a and 5a. By displacing the rotor shaft 2 toward the prime mover side by, for example, about 5 mm and restarting the prime mover, maintenance or repair of the failed portion can be performed.

Further, even if the rotor shaft 2 thermally expands in the axial direction due to the temperature rise due to the operation of the electric motor 2, the right end is free in the axial direction due to the insulating slide bearing 9b, so that the right end is the same as the conventional electric motor. However, unlike the case of being connected to the output shaft of the prime mover, thrust force is not transmitted to the prime mover or the propeller propulsion shaft, so that the electric drive system can be improved in reliability.

Further, since the through shaft 5 is magnetically shielded by the rotor shaft 2, the use of the insulating slide bearing 9b on the prime mover side eliminates the need for the insulating coupling conventionally used on the prime mover side.

Further, since the rotor shaft 2 and the penetrating shaft 5 transmit only the driving force of only the electric motor 1 and the driving motor, respectively, and the added torque is not generated as in the conventional case, the diameter of the rotor shaft 2 can be reduced.

Further, in the above embodiment, the electric motor 1 is described as an example of a synchronous electric motor, but may be an induction electric motor or another direct current electric motor, the load may not be the propeller of the ship, the prime mover may not be a diesel engine, and the gas may be gas. It may be a turbine engine or even an electric motor.

Further, depending on the usage conditions of the electric motor 1, an elastic coupling, which is also used conventionally, is interposed between the flange portions 2a and 5a to protect the prime mover 1 and the propeller from the short-circuit torque of the electric motor 1. Good.

[Effect of device]

As described above, according to the present invention, in the electric motor in which the output shaft of the prime mover is connected to one side of the rotating shaft and the load is connected to the other side of the rotating shaft, the rotating shaft is hollow, and the penetrating shaft is loosely inserted into the rotating shaft. By connecting the output shaft of the prime mover to one side of this through shaft, connecting the other side of the rotating shaft to one side of the other side of the through shaft, and connecting the load to the other side of the other side of the through shaft, The rotary shaft and the output shaft of the prime mover are individually connected directly to the load via the other side of the through shaft, and the rotary shaft and the through shaft can be disconnected regardless of whether the prime mover is connected to the load. It is possible to obtain an electric motor that can easily eliminate the load due to the thermal expansion of the rotating shaft and the thrust force to the prime mover.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the electric motor of the present invention. DESCRIPTION OF SYMBOLS 1 ... Electric motor, 2 ... Rotor shaft, 2a, 3a, 4a, 5a ... Flange part, 2b ... Through hole, 3 ... Drive shaft, 4 ... Motor output shaft, 5
... Penetration shaft, 6 ... Reamer bolt, 9 ... Bearing.

Claims (1)

(57) [Scope of utility model registration request] 1. An electric motor in which an output shaft of a prime mover is connected to one side of a rotary shaft and a load is connected to the other side of the rotary shaft,
The rotating shaft is hollow, and the through shaft is loosely inserted into this rotating shaft,
The output shaft of the prime mover is connected to one side of the through shaft with a fastener, the other side of the rotary shaft is connected to one side of the other side of the through shaft, and the load is attached to the other side of the other side of the through shaft. An electric motor characterized by being connected.