JPH02119549A - Cooling device for variable-speed induction motor - Google Patents

Abstract

PURPOSE:To improve the efficiency of revolution, and to lengthen the durability of a resistance material, etc., by ventilating air outside of a machine frame through the resistance material by the use of a ventilator and cooling the resistance material and dissipating heat thereof and discharging air exhausted from the inside of a ventilating drum to the outside of the machine frame. CONSTITUTION:A sirocco fan 71 is turned by the revolution of a motor 72 and the outside air is sucked from a suction port 74A, and the outside air is blasted to a ventilation flue 67 in a machine frame 14. The outside air in the ventilation flue 67 is divided agitated by a disk 19 for cooling, one of the outside air is fed uniformly to a plurality of ventilation flues 60, and the other is introduced to a ventilation flue 68 from an opening section 64 through a terminal-box ventilation flue 65 from an opening section 63. The outside air is introduced to the ventilation flue 60 while being agitated by a disk 20 for cooling from the ventilation flue 68. The outside air induced to the ventilation flue 60 of each stator 25, 31 cools each stator and is introduced to a ventilation flue 69, and is exhausted to the outside of a machine from an exhaust port 66 while cooling a resistance material (r) and the periphery of the resistance material in the ventilation flue 69.

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, a cooling device for a variable speed induction motor, which includes a single rotor, a plurality of 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 which can smoothly shift over a wide range from high speed to low speed and generate high torque over a wide range by adjusting the voltage phase shifter. There is no disclosure of a cooling device.

[Object of the Invention] The present invention is intended to improve the above-mentioned drawbacks of the prior art, and is aimed at improving the voltage phase shift device of a variable speed induction motor to provide a relatively large phase difference during startup or during low/medium speed operation. 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 can 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 of the present invention includes a ventilation passage 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 both sides of the stator core. In the ventilation ducts leading to the parts and the ventilation ducts formed between the stators installed in parallel and the inner periphery of the machine frame, air from the cooling fan installed concentrically with the rotating shaft of the motor is connected to the ventilation duct of one stator and the ventilation duct of the machine frame. The ventilation passages of the terminal box provided on the outer periphery of the frame communicate with the ventilation passages of the other stator, and each ventilation passage leads to the ventilation passage formed between the stators arranged in parallel and the inner periphery of the machine frame. The air from the fan is discharged from the exhaust port opened in the outer machine frame made of resistance material, and the ventilation passage is formed between the outer circumference of the stator and the inner circumference of the machine frame, and between the stators installed in parallel and the inner circumference of the machine frame. At the boundary with the ventilation path or between the terminal box ventilation path provided on the outer periphery of the machine frame and the other stator ventilation path, there is a ventilation system that balances the air flow between one stator ventilation path and the other stator ventilation path. The problem was solved by installing a regulation board.

[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 rotational efficiency of the motor 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 blower to cool and radiate heat, and the exhaust air is discharged from the ventilation stream to the outside of the machine frame. Therefore, the plurality of conductors installed in the plurality of rotor cores , the resistance material connected in a short circuit between the plurality of stator cores functions accurately without fluctuation.

Specifically, the ventilation passage is connected to the circulation passage of one stator and the other stator, and the air supplied by the fan is equally divided by the regulating plate, so that the plurality of stators can be cooled evenly. Moreover, by concentrating the air blown equally into the air passages containing the resistive material after cooling the stator, it becomes equivalent to directly cooling the resistive material with a cooling fan. 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 inside the terminal box outside the machine frame, so the other stator is cooled without being affected by the heat generated by the resistive 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.

Rotor parts 2 and 3 made of iron cores are mounted on a rotor shaft 4 with an arbitrary spacing, and the rotor parts are 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. Furthermore, the rotor 8 connects in communication between the rotor parts 2.3 a separate conductor 55 with a bend to the set of conductors, ie to the ends 51 of the rotor parts 2, 3. By doing so, it is formed integrally. The conductor 55 connected in communication between the rotor parts 2 and 3
The curved portion and adjacent separate conductors are connected and welded using a resistance material r...for example, a copper-nickel alloy, a nickel-chromium alloy, an 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... can be formed in the cooling effecting body 13, for example, in a zigzag shape or in any other arbitrary cooling stirring body. Furthermore, a plurality of ventilation passages 60 are provided on the outer periphery of the stator 25, 31, which 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 fitted in bearing discs 15 and 16, and the rotor 4 is rotatable.

As shown in FIGS. 1 and 3, a rotary stator 31 and a second stator 25, each having a winding 22.23 on the outside thereof concentrically with respect to the rotor core 2.3, are arranged in parallel. Set up 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 circumferential 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 a drive device 29 fixed to the outer circumference of the machine frame 14. Attach to the shaft.

A drive gear 36 partially inserted into the machine frame 14 from the frontage part 37 is engaged with a gear 33 fitted to the rotary stator 31, and a small motor 35 equipped with a switch forming the drive device 29 is connected. , a second stator 25 connected to the rotating stator 31 via a rotating mechanism 30 consisting of a gear 33 and a driving gear 36, making the rotating stator 31 rotatable, and fixed to the machine frame 14. The rotary stator 31 is rotatable in relation to the
It is formed into a voltage phase shifter.

Reference numeral 38 is a solenoid that controls the entry and exit movement of the protruding piece.
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 provided in the opening.

Next, explanation will be given with reference to FIG. The cooling fan device 73 has a motor 72 that fixes and rotates a sirocco fan 71 fixedly installed in a fan case 70, 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. , are integrally attached together with the bearing plate 15 by bolts 17. Air is suctioned from the suction lower 4A, and communicated from the blower lower 4B to the opening 40 of the bearing plate 15 and to the ventilation passage within the machine frame.

On the other hand, a terminal block 75 is provided on the outer periphery of the machine frame to be connected to supply power to the windings 23.22 of the stator 25.31. It is provided inside. The terminal box 76 has a ventilation passage 67 formed by one end of the stator 31, the bearing plate 15, and the d frame 14.
and an opening 63.6 that communicates with one side end of the stator 25 and a ventilation passage 68 formed by the bearing plate 16 and the machine frame 14.
4 are provided respectively, and the terminal box 76 is connected to the ventilation passage 65.
form. Reference numeral 69 indicates a ventilation passage, which is formed between the stator 25 and the stator 31 and by the machine frame 14.
It is connected to an exhaust port 66 that exhausts the air outside the machine frame. Further communication
When the regulating plate 77 is installed in the f12f565 or the ventilation path 69 to divide the ventilation into the ventilation path 67 and the ventilation path 68, the ventilation is balanced. Although a detailed explanation of the regulation plate 77 will be omitted, a perforated plate, a woven net, etc. are used.

The operation of the embodiment configured above is as follows.

The cooling device for a variable speed induction motor according to the present invention rotates a sirocco fan 71 by the rotation of a motor 72 of a cooling fan device 73 provided concentrically with a rotating shaft, sucks outside air from a suction lower 4A, and The ventilation passage 67 in the machine frame 14 communicates with the ventilation opening 40 of the bearing board 15 from the ventilation lower 4B.
Blow outside air into the area. The outside air in the ventilation passage 67 is supplied to the cooling impeller 19.
One part is sent evenly through a plurality of ventilation passages 60 and 61 established on the outer periphery of the stator 31, and the other part is sent through the terminal box ventilation passage 65 from the opening 63 and into the ventilation passage 68 from the opening 64. Introduce. From the ventilation passage 68, the cooling impeller 2
A ventilation passage 60 opened on the outer periphery of the stator 25 and stirred at 0.
Outside air is introduced into 61.

The outside air introduced into the ventilation passages 60.61 of each stator 25.31 cools each stator and is introduced into the ventilation passage 69 formed by including the resistive material r, and the outside air divided by − degrees is concentrated here. let The ventilation passage 69 cools the resistive material r and its surroundings while exhausting the resistive material r and its surroundings to the outside of the machine frame through the ventilation opening 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 in a well-balanced manner to the ventilation passages 60.61 of 5.31, and from the ventilation passages 60.61 of the two stators to the ventilation passage 69.
Even if the outside air is ventilated in multiple degrees as described above, the ventilation passage 69, which becomes high temperature including the resistance vIr, is equivalent to being directly cooled by the cooling fan device 73.

(Effects of the Invention) As mentioned above, the rotor conductors are connected 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. The device can efficiently cool the heat generated by the resistive material without affecting other components.In other words, the temperature rises from the stator, which has a lower temperature rise, according to the temperature difference between the components facing the machine frame. A remarkable cooling effect can be obtained by ventilation through the highly resistant material, and the resistance material has twice as much ventilation as the stator. Furthermore, by providing a regulating plate, the cooling effects of the two stators can be balanced, and a stable electric motor without left and right distortion can be achieved. From the above, it is possible to operate the cooling fan device to introduce outside air into the ventilation path, effectively cooling and dissipating the heat from the resistance material, ensuring sufficient torque especially in the low and medium speed range, and increasing the electric efficiency of the motor. according to what you can do,
The effect of improving the durability of the resistance material is remarkable.

[Brief explanation of drawings]

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...For passage, 13...
・Cooling body, 14...Machine frame, 15.16...Bearing plate, 17...Bolt, 19.20...Quadruple for cooling,
21...Bearing, 22.23...Winding, 25...Second stator, 26...Sliding bearing, 28...Stop ring, 29...Drive device, 30...times Motion structure, 3
DESCRIPTION OF SYMBOLS 1... Rotating stator, 33... Gear 35... Small motor, 36... Drive gear, 37... Opening part,
38... Solenoid, 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... Sirocco fan, 72... Motor,
73... Cooling fan device, 74A... Suction port, 74
B...Air vent, 75...Terminal block, 76...Terminal box, 77...Regulation plate, 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. The rotor has an integral rotor short-circuited between child cores by a resistive material, and a plurality of stators each consisting of stator cores arranged in parallel to face each rotor core of the rotor. A phase difference is created 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 having 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,
In the ventilation passage formed by the outer periphery of the plurality of stators and the inner periphery of the machine frame, the ventilation passage leading to both sides of the stator core, and the ventilation duct formed between the stators arranged in parallel and the inner periphery of the machine frame. , the air from the cooling fan is communicated with the ventilation path of one stator and the ventilation path of the other stator through the ventilation path of a terminal box provided on the outer periphery of the machine frame, and each ventilation path is connected to the inner periphery of the machine frame. A cooling device for a variable speed induction motor, characterized in that the air blown by the cooling fan is discharged from an exhaust port provided on the outer periphery of the machine frame through a ventilation path formed between stators arranged in parallel. (2) Ventilation of the terminal box provided at the boundary between the ventilation passage formed by the outer circumference of the stator and the inner circumference of the machine frame, and the ventilation passage formed between the stators installed in parallel and the inner circumference of the machine frame, or on the outer circumference of the machine frame. According to claim (1), an air regulation plate is provided at the boundary between the air passage and the air passage of the other stator to balance the air flow between the air passage of one stator and the air passage of the other stator. Cooling system for variable speed induction motors.