JP2009273268A - Frequency conversion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deterioration in equipment by ensuring a prescribed cooling capability without being affected by ambient conditions of an installation place. <P>SOLUTION: An electric motor 2 and a power generator 3 are placed on a base 1 while a package 5 is mounted so as to cover the apparatuses. The package 5 is provided with each inlet port 5a, 5a at a position facing each anti-coupling side 4b of the electric motor 2 and the power generator 3 and an exhaust port 5b at a circumferential position facing a coupling 4. When the electric motor 2 and the power generator 3 are driven, cooling air is sucked into the inside of each apparatus by rotation of cooling fans 2e, 3e via each inlet port 5a, respectively located on the anti-coupling side 4b, of the package 5 and each inlet port 2c, 3c of each apparatus. After cooling the inside of each apparatus, the cooling air is exhausted to the outside of the package 5 via each exhaust port 2d, 3d, located on the coupling side 4a, of each apparatus and the exhaust port 5b of the package 5 so as to ensure a prescribed cooling-air flow. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary frequency converter that uses an electric motor and a generator to transfer power between systems having different frequencies.

  A frequency converter is used when power is transferred between systems having different frequencies. In addition to the converter system that converts the power on the supply side into direct current and then converts it into a predetermined alternating frequency, the frequency conversion device includes, for example, two synchronous machines having different pole numbers as described in Patent Document 1. There is a method to use. In this method, one synchronous machine is connected to a frequency power source on the power supply side and operated as an electric motor, and the other synchronous machine is connected to a frequency power source on the power receiving side and operated as a generator.

  Therefore, when frequency conversion of 50 Hz / 60 Hz is performed, for example, the number of poles of the motor that is one of the synchronous machines is selected as 10 poles, and the number of poles of the generator that is the other synchronous machine is selected as 12 poles. By operating by inputting electric power, it can be converted into electric power of 60 Hz by a generator and output.

  This type of frequency converter is generally configured by mounting an electric motor and a generator on a base and connecting the rotating shafts of the electric motor and the generator via a coupling. In the electric motor and the generator, an air inlet and an air outlet are provided in the casing, respectively, and a cooling fan is attached to an internal rotating shaft.

And when the electric motor and the generator are driven, the cooling air is sucked into the device through the intake port by each cooling fan, and after cooling the inside of the device, it is exhausted to the outside through the exhaust port, The frequency of the electric power can be converted and output while suppressing the temperature rise of the electric motor and the generator.
Japanese Patent No. 2575535

  By the way, in the frequency converter as described above, depending on the ambient conditions of the installation location, the flow of cooling air in the intake direction and the exhaust direction may be disturbed, and the cooling capacity for the inside of the equipment may be reduced. For example, cooling air whose temperature has risen due to cooling inside the equipment is exhausted to the outside from the exhaust port of the casing. However, if the flow of cooling air is disturbed, the exhausted cooling air is re-applied to the air intake port of the equipment. May be sucked into the equipment. Then, the cooling air whose temperature has risen recirculates inside the device, thereby reducing the cooling capacity of the device. As a result, there is a problem that the device rises in temperature and causes performance degradation and insulation deterioration.

  The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to ensure a predetermined cooling capacity without being affected by the ambient conditions of the installation location. An object of the present invention is to provide a frequency conversion device capable of preventing deterioration of equipment.

  In order to achieve the above object, a frequency converter according to the present invention includes a base, a motor and a generator mounted on the base and having different numbers of poles, and a coupling for connecting the rotating shaft of the motor and the generator. And an air inlet or an exhaust port at a position that covers the electric motor and the generator, and that faces the anti-coupling side of the electric motor and the generator, respectively, and an air outlet or an air intake port at a circumferential position that faces the coupling And a package.

  According to the present invention, the electric motor and the generator are covered with the package, and the cooling air is sucked from the air inlet provided in the package to cool the device, and then the package is discharged from the air outlet provided in the package. It will be released to the outside. As a result, the cooling air can be secured without being affected by the ambient conditions of the installation location, and the flow of the predetermined cooling air can be secured, and the cooling air whose temperature has risen does not circulate inside the equipment again. The cooling capacity can be ensured to prevent the deterioration of the equipment.

  Hereinafter, a frequency converter according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of a frequency converter according to the present invention. In FIG. 1, an electric motor 2 and a generator 3 having different numbers of poles are placed on a base 1. The electric motor 2 and the generator 3 are installed so that the respective rotating shafts 2a and 3a are aligned, and the opposite ends of the rotating shafts 2a and 3a are connected by a coupling 4 so as to be integrated. Has been.

  The electric motor 2 and the generator 3 are configured by housing components such as a rotor and a stator in casings 2b and 3b. The casings 2b and 3b are provided with a plurality of air inlets 2c and 3c at intervals in the circumferential direction at positions far from the coupling 4, that is, on the side opposite to the coupling 4b. That is, a plurality of exhaust ports 2d and 3d are provided at the coupling side 4a at intervals in the circumferential direction.

  Cooling fans 2e and 3e attached to the rotary shafts 2a and 3a are provided at positions inside the exhaust ports 2d and 3d, respectively. When the motor 2 and the generator 3 are driven, the cooling fans 2e and 3e are provided. As shown by the arrows in the figure, the cooling air is sucked from the intake ports 2c and 3c on the anti-coupling side 4b, and the inside of the equipment is cooled, and then the casing 2b is discharged from the exhaust ports 2d and 3d on the coupling side 4a. , 3b is exhausted to the outside.

  A package 5 is attached to the base 1 so as to cover the electric motor 2 and the generator 3. In the package 5, intake ports 5 a and 5 a are respectively provided at positions facing the anti-coupling side 4 b of the electric motor 2 and the generator 3, and the exhaust port 5 b is disposed at a circumferential position facing the coupling 4. Is provided.

  Therefore, when the electric motor 2 and the generator 3 are driven, the cooling fans 2e and 3e rotate, so that the cooling air flows through the air intake 5a of the package 5 and the air intakes 2c and 3c of the respective devices located on the anti-coupling side 4b. The air is sucked into the inside of the device, and after cooling the inside of the device, the air is exhausted to the outside of the package 5 through the exhaust ports 2d and 3d of the device located on the coupling side 4a and the exhaust port 5b of the package 5. .

  Thereby, the electric motor 2 and the generator 3 are less affected by the ambient conditions of the installation location due to the presence of the package 5 covering these devices, and the intake port 5a of the package 5 and the intake ports 2c, The cooling air is reliably taken in because 3c is located close to the distance, and the temperature rises because the exhaust ports 2d and 3d of each device and the exhaust port 5b of the package 5 are located close to each other. The cooling air is surely discharged, and a predetermined flow of cooling air can be secured as shown by the arrows in the figure.

  Further, since the positions of the intake port 5a and the exhaust port 5b of the package 5 are separated from each other, the high-temperature cooling air exhausted from the exhaust port 5b is again sucked through the intake port 5a and circulates inside the device. This is no longer the case, and each device can ensure a predetermined cooling capacity and prevent deterioration.

  In the above embodiment, the intake side (the side where the intake ports 2c, 3c, 5a are provided) in the electric motor 2, the generator 3, and the package 5 is configured as the anti-coupling side 4b, and the exhaust side (exhaust ports 2d, 3d). In the above description, the cooling fan 2e, 3e, the side where the exhaust port 5b is provided) is configured as the coupling side 4a. Conversely, the intake side of the motor 2 and the generator 3 or the package 5 is configured as the coupling side 4a. The same effect can be obtained even if the exhaust side is configured as the anti-coupling side 4b to configure the flow of cooling air in the direction opposite to the arrow shown in the figure.

  FIG. 2 is a sectional view showing a second embodiment of the frequency converter according to the present invention. In FIG. 2, the present embodiment is different from the first embodiment in that the coupling side 4 a and the anti-coupling side 4 b of the motor 2 are shielded between the motor 2 and the generator 3 and the package 5. And a second partition plate 7 that blocks the coupling side 4a and the anti-coupling side 4b of the generator 3 is provided.

  According to the present embodiment, the cooling air exhausted from the exhaust ports 2d and 3d on the coupling side 4a of each device flows into the intake ports 2c and 3c on the anti-coupling side 4b. 2 can be reliably prevented by blocking the partition plates 6 and 7, so that the high-temperature cooling air exhausted from the exhaust ports 2d and 3d is again sucked through the intake ports 2c and 3c and circulates inside the equipment. Therefore, it is possible to prevent the deterioration of each device by ensuring a predetermined cooling capacity.

It is sectional drawing which shows 1st embodiment of the frequency converter by this invention. It is sectional drawing which shows 2nd embodiment of the frequency converter by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Electric motor 3 ... Generator 2a, 3a ... Rotary shaft 2b, 3b ... Casing 2c, 3c ... Intake port 2d, 3d ... Exhaust port 2e, 3e ... Cooling fan 4 ... Coupling 4a ... Coupling side 4b ... Anti-coupling side 5 ... package 5a ... intake port 5b ... exhaust port 6 ... first partition plate 7 ... second partition plate

Claims (3)

Base and
An electric motor and a generator with different number of poles mounted on this base;
A coupling for connecting the rotating shafts of the electric motor and the generator;
A package that covers the electric motor and the generator and has an intake port at a position facing the anti-coupling side of the electric motor and the generator, respectively, and an exhaust port at a circumferential position facing the coupling. A frequency converter.   The intake port and the exhaust port in claim 1 are reversed, and an exhaust port is provided at a position facing the anti-coupling side of the electric motor and the generator, respectively, and an intake port is provided at a circumferential position facing the coupling. The frequency converter according to claim 1, wherein:   A first partition plate is provided between the motor and the generator and the package to block the coupling side and the anti-coupling side of the motor, and the second is to block the coupling side and the anti-coupling side of the generator. The frequency converter according to claim 1, wherein a partition plate is provided.

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