JPH02131344A - Cooler for variable speed induction motor - Google Patents

Abstract

PURPOSE:To cool a resistor member and a plurality of stators evenly by supplying air from the outside of a machine frame through a fan to the resistor member and radiating heat therefrom then discharging air from an air drum to the outside of the machine frame. CONSTITUTION:Air is fed from the outside of an air path 67 to a plurality of air paths 60, 61 arranged at the outer circumference of a stator 31 and through an opening 63, an air path 65 of an air drum 76 and an opening 75 to an air path 79 and furthermore fed through an opening 64 to an air path 68. Air at the air path 68 is agitated through cooling vanes and led to the air paths 60, 61 arranged at the outer circumference of a stator 25. Outer air led to the air paths 60, 61 of the stators 25, 31 cools the stators and led to an air path 69 where a resistor member (r) and the vicinity thereof are cooled by a large amount of outer air fed through the opening 75 and the outer air led to the air paths 60, 61, then the outer air is discharged through a discharge port 66 to the outside of the machine frame.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device for a variable speed induction motor, and more particularly, to a cooling device for a variable speed induction motor, and more particularly, to a cooling device for a variable speed induction motor, including a single rotor, multiple stators, and a voltage phase shift device. The present invention relates to a cooling device for a variable speed induction motor having a so-called multiple stator configuration and capable of arbitrarily changing the rotational speed of a rotor and the generated torque by adjusting a voltage phase shift device.

[Conventional technology and its problems]

This type of induction motor is characterized by the generation of heat in the resistive material connecting the rotor conductors during startup, which takes a relatively large phase difference based on the adjustment of the voltage phase shifter, or during low to medium speed operation. and a variable speed induction motor according to the present invention, more particularly a single rotor with multiple rotor cores and multiple stators and a voltage phase shifter, and by adjusting the voltage phase shifter, it is possible to smoothly change gears over a wide range from high speed to low speed and generate high torque over a wide range. There is no disclosure of a cooling device.

(Objective of the Invention) The present invention is intended to improve the drawbacks of the above-mentioned prior art.The present invention is aimed at improving the above-mentioned drawbacks of the prior art. To reduce the heat generated by the resistive material and the increase in heat storage in the component parts, a cooling device is used to ventilate the resistive material, multiple stators, rotors, etc. to cool and dissipate the heat, thereby effectively increasing the rotational efficiency of the motor and reducing the resistance. An object of the present invention is to provide a cooling device for improving the durability of materials.

The variable speed induction motor of the present invention is used by being connected to a single-phase or three-phase power source, etc., and the rotor type may be a normal squirrel cage type, a double squirrel cage type, a deep groove cage type, a special squirrel cage type, or a wound type. It can be applied to any format such as

[Means for solving problems]

In order to achieve the above object, the variable speed induction motor cooling device according to the present invention includes a ventilation passage 61 formed by the outer periphery of the plurality of stators and the inner periphery of the machine frame of the variable speed induction motor, and a stator core. In the ventilation passage 60 that leads to both sides and the ventilation passage 69 formed between the stators arranged in parallel and the inner periphery of the machine frame, the air from the cooling fan installed concentrically with the rotating shaft of the electric motor is transferred to the ventilation passage of one stator. 67, the ventilation passage 79 consisting of an opening provided in the machine frame between the stators through the ventilation passage 65 of the ventilation barrel provided on the outer periphery of the machine frame, and the ventilation passage 68 of the other stator. The passage leads to a ventilation passage 69 formed between the stators arranged in parallel and the inner periphery of the machine frame, and exhausts the air from the cooling fan through an exhaust port 66 opened in the outer machine frame made of resistance material.
A ventilation passage 65 of the ventilation barrel provided at the boundary between the ventilation passage 61 formed by the outer periphery of the stator and the inner periphery of the machine frame, and the ventilation passage 69 formed between the stators arranged in parallel and the inner periphery of the machine frame, or on the outer periphery of the machine frame. The problem was solved by installing a regulating plate to balance the air flow in at least one of the openings.

[For production]

The variable speed induction motor according to the present invention does not cause any trouble because the time required from startup to maximum speed operation is extremely short, but especially when operating in the medium and low speed range, the resistance material Heat generation increases, and due to the heat generation effect, the motor compensation rotation efficiency and the durability of the resistance material are significantly reduced. In the present invention, the air outside the machine frame is ventilated through the resistance material by the blowing ffl device to cool and radiate heat, and the exhaust air is discharged from the inside of the ventilation shell to the outside of the machine frame. A resistance material in which conductors are short-circuited and connected between a plurality of stator cores functions accurately without fluctuation.

In detail, the ventilation path is connected to the ventilation path between the stators and the ventilation path between one stator and the other stator, and the air blown by the fan is divided equally by a regulating plate to evenly cool the resistive material and multiple stators. I can do it. Furthermore, since the relatively low-temperature stator is cooled before the relatively high-temperature resistive material is cooled, it is possible to prevent heat from spreading from the resistive material to the stator.

From a different point of view, when the variable speed induction motor of the present invention is normally cooled by air blowing from a cooling fan, one stator, the resistor material, and the other stator are usually cooled in this order. It is inevitable that the heat generated by the stator will spread to the other stator. In other words, the air from the cooling fan is divided equally and connected to the ventilation path of the other stator via the ventilation path formed in the terminal box outside the separate frame, so the other stator is cooled without being affected by the heat generated by the resistor material. can do.

(Example) An embodiment will be described with reference to FIGS. 1 to 4.

Reference numeral 1 in FIG. 1 is a variable speed induction motor according to the present invention, and the induction motor has the following configuration.

The rotor parts 2 and 3 made of iron cores are mounted on the rotor@4 with an arbitrary interval, and the rotor part is made by casting aluminum into the rotor core and having a plurality of conductors 5 and one end thereof. An end portion 51 was formed by combining the short circuit rings 6 and 7 and the plurality of conductors on the other side. Further, the rotor 8 connects a separate conductor 55 having a curved portion to the pair of conductors between the rotor parts 2 and 3, that is, to the ends 51 of the rotor parts 2 and 3. It is formed integrally by connecting. A conductor 5 connected in an O shape between the rotor parts 2 and 3.
5 is connected and welded between the curved portion and adjacent separate conductors using a resistance material r...for example, copper-nickel alloy, nickel-chromium alloy, iron-chromium alloy, or stainless steel. At this time, the resistance material r is integrally formed so as to surround the separate conductor 55 and is welded, or a plurality of resistance pieces are welded between the separate conductors.

Further, the resistance material r extending over the curved portion is provided with a notch extending outward from the rotor starting from the center line of the rotating shaft 4. Also,
A plurality of resistive materials r... are formed into a zigzag shape or any other cold [! The cooling effecting body 13 can be formed as a stirring body. Furthermore, a plurality of ventilation passages 60 are provided on the outer periphery of the stator 25, 31 and communicate with both sides of the stator, and a ventilation passage 61 is provided between the outer periphery of the stator and the inner periphery of the machine frame.

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 blown into bearing discs 15 and 16, so that the rotor 4 can freely rotate.

As shown in FIGS. 1 and 3, a rotation factor 31 having windings 22 and 23 on the outer side of the rotor core 2.3 and a second stator 25 are arranged facing each other in parallel. Cheating. Machine frame 1
A sliding bearing 26 is installed between the rotary stator 31 and the rotating stator 31, and horizontal movement of the sliding bearing 26 is fixed by a stop ring 28 fitted to the machine frame 14. Second stator 2
A fixed stator 5 is fixed to the inner wall surface of the machine frame 14.

A gear 33 is fitted on the outer peripheral surface of one side of the rotary stator 31, and a drive gear 36 is connected to a small motor 35 for forward and reverse rotation, which is formed by a drive device 29 fixed on the outer periphery of the machine frame 14. Attach the shaft.

The driving gear 36 partially inserted into the machine frame 14 through the opening 37 is engaged with the gear 33 fitted to the rotation factor 31, and a small motor 35 equipped with a switch forming the driving device 29 is connected. , a second stator connected to the rotating stator 31 via a rotating mechanism 30 consisting of a gear 33 and a driving gear 36, the rotating stator 31 being rotatable, and fixed to the machine frame 14. 25, a rotatable rotary stator 31,
It is configured in a voltage phase shifter.

Reference numeral 38 is a solenoid for controlling the protrusion, and the solenoid 38 is attached to the frame 14 and the protrusion is controlled by the rotary stator 3.
It is freely engaged with the gear 33 fitted to the gear 1,
This is a stopper that prevents the stator from easily turning unnecessarily due to reactions to the stator when torque is generated. Bearing board 15
A plurality of ventilation holes 40... are bored in the.

Next, a description will be given with reference to FIGS. 2 to 4.

The cooling fan device 73 has a motor 72 that fixes and rotates the sirocco fan 71 fixedly installed on the fan goose 7o, and the fan case 70 is installed on the side of the bearing plate 15 so that the motor 72 is formed concentrically with the rotating shaft 4. , bolt 1 together with bearing plate 15
Assemble it as one piece according to step 7. Air is sucked through the suction port 74A, and the air is communicated with the opening 40 of the bearing plate 15 through the ventilation port 74B, which communicates with the ventilation path within the machine frame.

A ventilation cylinder 76 is provided on the outer circumferential surface of the machine frame, and the ventilation cylinder 76 has a ventilation passage 67 formed by one end of the stator 31, the bearing plate 15, and the rectangular frame 14, and one end of the stator 25. and bearing plate 1
6 and the machine frame 14, and an opening 75 is provided in the machine frame 14 between both stators 25, 31, and A path 65 is formed. A ventilation passage 69 is formed between the stator 25 and the stator 31 and by the machine frame 14, and is connected to an exhaust port 66 for exhausting air outside the machine frame.

Furthermore, a regulating plate 77.78 is installed in the ventilation passage 65 or ventilation passage 69.
This is to balance the ventilation when dividing the ventilation into the ventilation passages 67, 68, and seven ventilation passages. Although a detailed explanation of the regulation plates 77 and 78 will be omitted,
Perforated plates, woven nets, etc. are used.

The operation of the embodiment configured above is as follows.

The variable speed induction motor cooling device according to the present invention rotates the Sirotsko fan 71 by the rotation of the motor 72 of the cooling fan device 73 provided concentrically with the rotating shaft, sucks outside air from the suction port 74A, and The ventilation port 74B communicates with the ventilation port 40 of the bearing board 15, and the ventilation passage 67 in the machine frame 14
Blow outside air into the area. The outside air in the ventilation passage 67 is divided while being stirred by a single cooling impeller, and one part is sent evenly through the plurality of ventilation passages 60 and 61 opened around the outer periphery of the stator 31, and the other part is sent from the opening 63 to the ventilation body 76. Passing through the ventilation path 65 and opening 75
It is introduced into the ventilation passage 79 through the opening 64 and into the ventilation passage 68 through the opening 64 . From the ventilation passage 68, outside air is stirred by the cooling impeller 20 and introduced into ventilation passages 60, 61 opened around the outer periphery of the stator 25.

The outside air introduced into the ventilation passages 60.61 of each stator 25.31 cools each stator and is introduced into the ventilation passages 69 formed including the resistive material r, where the once divided outside air is concentrated. . In the ventilation passage 69, a large amount of outside air from the opening 75 and the outside air introduced into the ventilation passages 60, 61 cool the resistive material r and its surroundings, and exhaust the air out of the machine frame from the exhaust port 66.

The outside air blown to one stator and the other stator does not pass through the relatively high-temperature ventilation path 69, but first passes through the ventilation paths 67 and 58, so there is no heat spread due to the heat generated by the resistor material r. In addition, the stator 2 is controlled by the regulating plate 77 provided at any position in the ventilation passage
Air is blown to the ventilation passages 60.61 of 5.31 in a well-balanced manner, and the darkness of the air blown to the opening 75 is adjusted by the regulating plate 78. Air is concentrated in the six ventilation passages from the ventilation passages 60, 61 and openings 75 of the two stators, and even if the outside air is once divided and ventilated as described above, the ventilation passage 69 containing the resistive material r becomes hot. is equivalent to direct cooling by the cooling fan device 73.

(Effects of the Invention) As mentioned above, the rotor conductor can be controlled at startup with a relatively large phase difference by adjusting the voltage phase shift device of the variable speed induction motor according to the present invention, or during low/medium speed operation. It is possible to create a device that efficiently cools the heat generated by the connected resistance materials without affecting other components.In other words, according to the temperature difference of each component in the machine frame, the temperature is lowered from the stator with the lowest temperature rise. A remarkable cooling effect can be obtained by providing ventilation to the resistance material with a high rise, and the resistance material has twice the ventilation as the stator.Also, by providing a regulating plate to balance the cooling effect, a stable electric motor with no left and right distortion can be achieved. can do.

Based on the above, the cooling fan device is operated to introduce outside air into the ventilation path, effectively cooling and dissipating the heat from the resistance material.
In addition to being able to fully secure torque in the medium speed range and increasing the electric efficiency of the motor, it also has a remarkable effect of improving the durability of the resistance material.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a variable speed induction motor according to the present invention, Fig. 2 is a plan sectional view of Fig. 1, Fig. 3 is a front sectional view of a rotating stator portion, and Fig. 4 is a fixed stator. It is a front sectional view of a part. 1... variable speed induction motor, 2.3... rotor part,
4... Rotor shaft, 5... Rotor conductor, 6.7...
Short circuit ring, 8... Rotor, 12... Passage body, 13...
- Cooling body, 14... Machine frame, 15.16... Bearing plate, 17... Bolt, 19.20... Cooling impeller,
21...Bearing, 22.23...Winding, 25...Second stator, 26...Sliding bearing, 28...Stop ring, 29...One drive device, 30...times Movement mechanism, 3
DESCRIPTION OF SYMBOLS 1... Rotating stator, 33... Gear 35... Small motor, 36... Drive gear, 37... Opening part,
38... Renoid, 40... Ventilation port, 51...
End, 55... Separate conductor with curve, 60.6
1... Ventilation duct, 63, 64... Opening, 65...
Ventilation duct, 66... Ventilation port, 67... Ventilation duct, 68.
... Ventilation duct, 69... Ventilation duct, 70... Fan case, 71... Sirotskov 7n, 72... Motor,
73... Cooling fan device, 74A... Suction port, 74
B... Ventilation port, 75... Opening, 76... Blower cylinder, 77.78... Regulation plate, 79... Ventilation path, r...
・Resistance material.

Claims (2)

[Claims] (1) A plurality of rotor conductors are installed in a continuous manner on a plurality of rotor cores that are mounted on the same rotating shaft at regular intervals, and the rotor conductors are connected to the plurality of rotating shafts. It has an integral rotor whose child cores are short-circuited by a resistive material, and a plurality of stators each consisting of stator cores arranged in parallel facing each rotor core of the rotor. , a phase difference between the voltage induced in the conductor part of the rotor facing one of the plurality of stators and the voltage induced in the conductor part of the rotor facing the other stator. A cooling device for a variable speed induction motor, which has a voltage phase shift device inside and outside of a motor frame, the cooling device having a cooling fan concentrically with the rotating shaft of the variable speed induction motor,
A ventilation passage 61 formed by the outer periphery of the plurality of stators and the inner periphery of the machine frame, a ventilation passage 60 communicating with both sides of the stator core, and ventilation formed between the stators arranged in parallel and the inner periphery of the machine frame. In the passage 69, the air from the cooling fan is passed through the ventilation passage 67 of one of the stators, the ventilation passage 65 of the ventilation barrel provided on the outer periphery of the machine frame, and the ventilation passage 79 consisting of an opening provided in the machine frame between the stators. ,
The ventilation passage 6 communicates with the ventilation passage 68 of the other stator, and each ventilation passage is formed between the inner periphery of the machine frame and between the stators arranged in parallel.
9, the air blown by the cooling fan is discharged from an exhaust port 66 provided on the outer periphery of the machine frame. (2), Ventilation passage 61 formed by the outer circumference of the stator and the inner circumference of the machine frame
and a ventilation passage 6 formed between the stators arranged in parallel and the inner periphery of the machine frame.
9 or on the outer periphery of the machine frame.
2. The cooling device for a variable speed induction motor according to claim 1, wherein a regulating plate is provided in at least one of the openings provided in the opening to balance the air flow.