JPH02299447A - Rotor for motor - Google Patents

Abstract

PURPOSE:To reduce the number of parts and contrive cost down by a method wherein cooling fins are provided with a disc type ring to make a cooling fan while the ring is formed integrally with a short-circuit ring and the cooling fins. CONSTITUTION:A cooling fan 70 is constituted of short-circuit rings 6, 7, formed by casting into the outside of rotor parts 2, 3, cooling fins 72 and a disc type ring 73. The cooling fan 70 sucks atmosphere from the direction of a rotary shaft 4 by the rotation of a rotor 8 and discharges air radially about the rotary shaft 4 by the cooling fan 72. Stator coils 22, 23 are in the direction of discharge and, therefore, they are cooled directly. Thereafter, the air cools stators 25, 31 through a ventilating passage 60 and is discharged out of an air discharging port 66. Heat, generated in the rotor 8, is transferred to the short-circuit rings 6, 7, the cooling fins 72 and the disc type ring 73 but effective heat dissipation is effected since heat dissipating area is expanded by the disc type ring 73 and the like. According to this method, a plurality of fans may be formed without increasing the number of parts and cooling effect may be improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a rotor for an induction motor.

[Conventional technology]

A conventional technique is shown in FIG. Operation of electric motors, not just induction motors, is accompanied by heat generation, and as a countermeasure against this, a plurality of cooling fins 82 are provided on the short circuit ring 81 formed by casting, especially in the rotor 80 of the squirrel cage induction motor. Efforts have been made to increase the cooling effect by increasing the heat dissipation area and stirring the atmosphere. However, this cooling fin 82
Although there was a heat sink and an atmosphere agitation function, there was no fan function, and it was necessary to provide a separate fan for suction or ventilation inside and outside the motor frame.

For this purpose, a suction or ventilation fan was provided on the rotating shaft of the rotor (2), and the fan was rotated by a separate electric motor to perform suction or ventilation.

[Problem to be solved by the invention]

According to conventional technology, the motor is cooled by a fan installed on the rotating shaft of the rotor or by a fan separately driven by the motor. Therefore, providing a fan reduces the restrictions on the peripheral shape and increases the number of parts. Therefore, these cost problems have been solved by reducing the cost of component materials and manufacturing, but this method is still used, with a separate cooling fan.

In view of the above, the technical challenge is to develop a cooling fan or its device that reduces the number of parts and costs.

[Means to solve the problem]

According to the present invention, a rotor core group is formed by laminating steel plates having a plurality of slots, and rotor conductors are formed in the plurality of slots by casting, and the rotor conductors are formed on both sides or one side of the rotor core group. In a rotor formed with a short-circuit ring and cooling fins for short-circuiting the rotor, a disc-shaped ring is provided outside the cooling fin to form the cooling fin as a cooling fan, and the disc-shaped ring is configured to form a cooling fan. conductor,
The short circuit ring and cooling fins are integrally formed by casting at the same time as a means to solve the above problem.

[For production]

By providing a disc-shaped ring on the outside of the conventional cooling fin,
Conventional cooling fins use short-circuit rings, cooling fins, and disk-shaped rings2) to draw suction from the direction of the rotation axis of the rotor.
A fan is formed around the outer circumference of the rotor, and has the same effect as a plate fan.

Furthermore, by forming the disk-shaped ring by casting simultaneously with the formation of the short circuit ring and the cooling fins, the cooling fan is formed integrally with the rotor.

C Embodiment] The configuration of a variable speed induction motor according to the present invention will be explained below with reference to FIGS. 1 to 3.

A rotor portion 2.3 consisting of an iron core is mounted on a rotor shaft 4 at an arbitrary interval, and the rotor portion is formed by stacking steel plates with a plurality of conductor holes to form a rotor core. Applying an insulating material to the rotor core and casting aluminum to form a plurality of conductors 5 in the conductor holes, short circuit rings 6 and 7 at one end thereof, and an end portion 51 for the plurality of conductors at the other side. did.

Further, a conductor 55 is connected in a continuous manner between the rotor portions 2 and 3 to form an integral structure. Rotor part 2
, 3, the conductor 55 connected in a continuous manner between the resistive material r...
・For example, short-circuit connections are made through aluminum, copper-nickel alloy, nickel-chromium alloy, iron-chromium alloy, stainless steel, etc. A conductor 55 between the rotor parts 2 and 3
The space formed by the resistive material and its surroundings may be left as is or may be formed from a non-magnetic material.

Moreover, the resistance material r can be formed in the cooling effecting body 13 as a cooling agitator having an arbitrary shape. In this way, the rotor parts 2, 3, the conductor 55 and the resistive material r form the integral rotor 8.
form.

Also, in the rotor part 2.3, both sides 10.11 of the rotor 8 are provided.
Provide multiple ventilation shells that communicate with the

A stator 25.31 respectively faces the rotor part 2.3.
are provided concentrically with the rotor portions 2, 3, and the stator 25.
31, a plurality of ventilation passages 60 communicating with both sides of the stator.
will be established.

Bearing discs 15 and 16 provided on both sides of the cylindrical machine frame 14 are integrally assembled to both sides with bolts 17, cooling impellers 19 and 20 are attached to both sides of the rotor 8, and the rotor Both ends of the shaft 4 are supported by bearings 21.21 fitted in bearing discs 15.16, and the rotor 4 is rotatable.

As shown in FIGS. 1 and 2, a winding 22.23 is disposed concentrically with respect to the rotor portion 2.3 on its outer side as previously described.
The rotating stator 31 and the second stator 25 are arranged side by side, facing each other. Also, at this time, as is clear from Fig. 1, the stator 2
The coil ends of the windings 22 and 23 protruding in the four directions of the rotation axis in 5.3.1 are provided so as to spread outward from the stator circumference from the center of the stator 25 and 31, and are arranged between the plurality of rotor cores. To make it possible to shorten the length of the variable speed induction motor in the four directions of the rotating shaft according to the present invention, in which the resistance material is provided in the variable speed induction motor.

A sliding bearing 26 is installed between the machine frame 14 and the rotary stator 31, and the sliding bearing 26 is fixed in horizontal movement by a stop ring 28 fitted to the machine frame 14. The second stator 25 is a fixed stator fixed to the inner wall surface of the machine frame 14. A gear 33 is fitted on the outer circumferential surface of one side of the rotary stator 31 (2), and a drive device 2 is fixed to the outer circumference of the machine frame 14.
A small motor 35 for forward and reverse rotation consisting of 9 is provided with an outer frame 32, a drive gear 36 is pivotally attached to the small motor 35, and the drive gear 36 is engaged with the outer frame 32 to rotate the reduction gear 34. Installed so that it can move freely.

The reduction gear 34, which is partially inserted into the machine frame 14 through the opening 37, is engaged with the gear 33 fitted to the rotary stator 31, and a small motor 35 equipped with a switch that serves as the drive device 29 is connected. Rotating stator 31 via rotating mechanism 30 consisting of gear 33, drive gear 36, and reduction gear 34
The rotary stator 31 is rotatably connected to the machine frame 14, and the rotary stator 31 is rotatably connected to the second stator 25 fixed to the machine frame 14. It is. code 3
8 is a solenoid that controls the entry and exit movement of the projecting piece, and solenoid 3
8 is attached to the machine frame 14, and its projecting piece is freely engaged with the gear 33 fitted to the rotary stator 31 (2). This is a stopper to prevent it from turning easily unless necessary.

A plurality of openings 39 are opened, and the plurality of openings 39 are formed as air exhaust ports 66.

A plurality of ventilation holes 40... are bored in the bearing discs 15, 16.

Next, FIG. 3 shows a rotor portion 2 including a resistive material r and a conductor 55.
, 3 is a side cross-sectional view. Ends 51 of rotor parts 2, 3
A plurality of conductors 55 formed by a conductor 56 and a conductor 57 having a curved portion are fixed in a continuous manner.

A resistive material r is placed around the conductor 55 fixed in a continuous manner.
Connect and weld. At this time, the resistance material r may be formed integrally with the conductor 55 by die-casting. The conductors 56 and 57 having curved portions were shown above, but in some cases the curved portion may be omitted.2) In that case, the conductor 56 and the conductor 57 may be aligned with each other by providing an arbitrary interval. be.

Incidentally, although the example in which the conductor 55 is formed by the conductor 56 and the conductor 57 has been shown, the conductor 55 is formed by the conductor 56 and the conductor 5 having a curved part.
7 are provided symmetrically and the combined portions are fixed by welding means such as spot welding (2), or may be integrally formed by die casting as described above. At this time, the conductor 56,
The cross-sectional shape of 57 can be arbitrarily selected.

By the way, in this embodiment, the voltage phase shifting device is shown to be based on the rotation of the stator, but the method of creating a phase difference between one stator and the other stator, such as a method of changing the wiring of the stator, is not limited to this embodiment. .

By the way, the induction motor of this embodiment is a multi-stator induction motor 2), and more specifically, a single rotor, a plurality of stators, and one stator among the plurality of stators. the rotor by adjusting a voltage phase shifter that creates a phase difference between the voltage induced in the opposing rotor conductor portions and the voltage induced in the corresponding rotor conductor portion facing the other stator. The rotational speed and generated torque of the rotor can be changed arbitrarily, but when generating high torque especially in the low speed range, current flows through the resistance material between the rotor cores due to the phase difference, causing heat generation. 2) In order to suppress the rise in temperature of the electric motor due to this heat generation, an efficient and simple cooling device is required.

The configuration of the variable speed induction motor according to the present invention has been described above.

Next, an embodiment of the present invention is shown in FIG.

FIG. 4 shows the rotor 8 with some parts omitted.

A cooling fan 70 is constituted by short-circuit rings 6, 7, cooling fins 72, and a disc-shaped ring 73 formed by casting on the outside of the rotor parts 2, 3 made of laminated steel plates. At this time, if the cooling fins 72 are formed radially and linearly centering on the inside of the rotor, they can function as a cooling fan whether the rotor rotates forward or backward.

This cooling fan sucks in outside air from the direction of the rotating shaft 4 as the rotor 8 rotates, and discharges it radially around the rotating shaft 4 through the cooling fins 72 .

Since the stator coils 22 and 23 are visible in the discharge direction, they are directly cooled, and then the stators 25 and 3 are cooled through the ventilation path 6o.
．． At the same time, the heat generated by the rotor 8 is conducted to the short-circuit ring 6゜7, the cooling fins 72, the plate-shaped ring 73, etc., but the heat dissipation area is expanded by the plate-shaped ring 73, etc. Because of this, heat is dissipated effectively. Furthermore, by providing the disk-shaped ring 73 on the outside of the cooling fins 72, it is now possible to add a cooling fan, which has been formed as a separate component, to the rotor, and it has become possible to form a plurality of fans integrally.

Further, at this time, the number of parts does not increase.

〔Effect of the invention〕

With the above configuration, it is possible to install multiple cooling fans without increasing the number of parts 2)
The fan, which has been a separate component up to now, can be formed integrally with the rotor, and the cooling effect can be improved.

In this way, since there are no surrounding restrictions due to the provision of a separate fan, it is possible to reduce the size accordingly.
), it has a great effect in that it can improve not only the cost but also the performance by improving the cooling effect due to the reduction in the number of parts.

[Brief explanation of drawings]

Fig. 1 shows a variable speed induction motor according to the present invention, and Fig. 2 shows a variable speed induction motor according to the present invention.
3 is a detailed view between the rotor cores of the variable speed induction motor according to the present invention, FIG. 4 is a perspective view of the rotor portion showing an embodiment with a part omitted, and FIG. 5 indicates a conventional example,
It is a perspective view of a rotor part with a part omitted. 1... variable speed induction motor, 2.3... rotor part,
4... Rotor shaft, end... Rotor conductor, 6, 7... Short circuit ring, 8... Rotor, 10.11... Both sides, 13
...Cooling body, 14...Machine frame, 15.16...
Bearing board, 17... Bolt, 21... Bearing, 22, 2
3 river windings, 25... second stator, 26... sliding bearing, 28... stop ring, 29... drive device,
30... Rotating mechanism, 31... Rotating stator, 32...
・Outer frame, 33... Gear, 34... Reduction gear, 3
5... Small motor, 36... Drive gear, 37...
・Opening, 38... Solenoid, 40... Ventilation port,
51... End portion, 55... Conductor having a curved portion, 56
...Conductor, 57...Conductor, 60...Ventilation path, 66
...Exhaust port, 70...Cooling fan, 72...Cooling fin, 73...Disc ring, 80...Rotor, 8
1... Short circuit ring, 82... Cooling fin, r... Resistance material.

Claims (2)

[Claims] (1) A rotor core group made of laminated steel plates with a plurality of slots, rotor conductors in the plurality of slots by casting, and rotor conductors on both sides or one side of the rotor core group. 1. A rotor for an electric motor, comprising a short-circuit ring for short-circuiting and a cooling fin, the rotor comprising a disk-shaped ring provided on the outside of the cooling fin to form the cooling fin into a cooling fan. (2) The motor rotor according to claim 1, wherein the disc-shaped ring provided on the outside of the cooling fin is integrally formed by casting at the same time as the rotor conductor, the short-circuit ring, and the cooling fin.