JP2005073500A - Inverter-driven motor and equipment driven by inverter-driven motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cooling efficiency of an inverter drive motor and to reduce the size, reliability and cost.
SOLUTION: An inverter 2 housed in a case, an electric motor 3 having a cooling mechanism 9 and driven by the inverter 2, a wiring 4b connecting the inverter 2 and the electric motor 3, and an electric component constituting the inverter 2 Part of the heat generating component 2b, the heat generating component 2b drawn out of the case and fixed to the component of the motor 3, and the wiring 4c connecting the inverter 2 and the heat generating component 2b, and the inverter drive motor Configure. Since the heating element constituting the inverter 2 is drawn out of the inverter and cooled by the cooling fan 9 of the electric motor, the inverter can be reduced in size, the cooling efficiency is increased, the reliability is improved, and any special device can be used. Since it is not necessary to add, it can be configured at low cost.
[Selection] Figure 1

Description

  The present invention relates to an inverter drive motor including an inverter and an electric motor driven by the inverter, and more particularly to an inverter drive motor that is inexpensive and excellent in cooling performance.

  FIG. 8 is a general configuration diagram of a system for driving an electric motor with an inverter. The output of the power source 1 and the input part of the inverter 2 are connected by a wiring 4a, and the output part of the inverter 2 and the electric motor (motor) 3 are connected by a wiring 4b. The inverter 2 converts electric power taken from the power source 1 into required electric power, supplies this converted electric power to the motor 3, and drives the motor 3 at the required rotational speed.

  FIG. 7 is a general configuration diagram of the inverter 2. The inverter 2 is smoothed by a rectifying circuit unit 2a that converts AC power taken from the power source 1 into DC power, a reactor 2b that smoothes the DC converted by the rectifying circuit unit 2a, a capacitor 2c, and a control unit 2d. It is comprised with the conversion part 2e which converts direct current | flow into alternating current power based on the instruction | command from the control part 2d.

  Since the motor driven by the configuration as shown in FIG. 8 is controlled based on a command from the control unit 2e, it is possible to save power. Note that, as related to an electric motor driven by an inverter, there are, for example, Japanese Patent Laid-Open Nos. 5-83989 and 62-239896.

  In recent years, devices driven by electric motors (motors), such as air conditioners, outdoor units of air conditioners, pumps, washing machines, fan devices, etc., have been driven by inverters as described above in order to save energy and facilitate control. Things are becoming mainstream. On the other hand, these devices are also highly demanded for higher output and smaller size, and are often configured by storing a large-capacity motor, inverter, and other components in a small package.

  As a conventional product, there is one in which an inverter is integrated into the back of an electric motor. If it does in this way, size reduction can be achieved rather than what combined the magnitude | size of the inverter and the magnitude | size of the electric motor. However, such an integrated product has a problem that it cannot save space in addition to the problem that the cost is increased.

  This is because an inverter-integrated electric motor is larger than a single electric motor, so if it is combined with other components, such as a fan device, together with an impeller, etc., and stored in one package, This is because the package will become worse and will require a larger package.

  When an inverter, an electric motor, and other components are stored in a package, if each component is small, it can be stored in the package without a gap, so that a small package can be obtained. However, on the other hand, if an inverter that is a heating element and an electric motor that is also a heating element are separately housed in one package, a dedicated cooling mechanism is required for each heating element. There arises a problem that the structure becomes large.

  An object of the present invention is to provide a small inverter-driven electric motor that has high cooling efficiency and reliability, is inexpensive, and is not provided with a cooling mechanism in the inverter.

  The object is to provide an inverter housed in a case, a motor that has a cooling mechanism and is driven by the inverter, a first wiring that connects the inverter and the motor, and electrical components that constitute the inverter. A part of the heat generating parts, the heat generating part drawn out of the case and fixed to the constituent body of the electric motor, and the second wiring for connecting the inverter and the heat generating part are configured. This is achieved.

  Since the heat generating components that constitute the inverter and are drawn to the outside are cooled by the cooling mechanism of the electric motor, the amount of heat generated by the inverter body is reduced, and the inverter itself does not require a cooling mechanism. For this reason, even if it is housed in a small package, the cooling efficiency does not decrease, and it is possible to configure a highly reliable, inexpensive, and small inverter-driven motor.

  According to the present invention, the electric parts constituting the inverter are pulled out from the inverter and fixed to the motor structure or installed in a place where the cooling action of the motor cooling mechanism extends, so there is no need to provide a cooling mechanism in the inverter itself. It is possible to reduce the size, the entire device using the inverter-driven motor can be stored compactly in one package, and even a package of the same size can store a large capacity motor, Reliability is improved due to high cooling efficiency. Furthermore, since a special device is not newly provided, there is an effect that the cost can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram of an inverter-driven motor according to the first embodiment of the present invention. The inverter drive motor according to this embodiment includes an inverter 2 connected to the AC power source 1 via a wiring 4a and a motor 3 connected to the inverter 2 via a wiring 4b.
As shown in FIG. 2 (a), the electric motor 3 has both ends of the cylindrical housing 3a closed by end brackets 3b and 3c as shown in FIG. The shaft 3f is rotatably held by bearings 3d and 3e provided at the center portion. A rotor 3g is fixed to the central portion (inside the housing 3a) of the rotating shaft 3f, and a stator 3h is fixed to the inner peripheral surface of the housing 3a.

  The rotating shaft 3 protrudes not only on the front side (end bracket 3b side) but also on the back side (end bracket 3c side), and the cooling fan 9 is fitted to the back side protruding portion of the rotating shaft 3f. With the rotation of 3f, the cooling fan 9 also rotates to generate cooling air. An end cover 3i is provided so that the direction of the cooling air is changed to the housing 3a side and the maintenance fan is not injured by the cooling fan 9 that rotates accidentally.

  In the present embodiment, the reactor 2b shown in FIG. 7 constituting the inverter is pulled out from a case (not shown) housing the inverter, the reactor 2b is fixed in the case 7 fixed to the outer periphery of the housing 3a of the electric motor 3, and the reactor 2b And the inverter body are connected by wiring 4c. It is preferable in terms of heat conduction that the reactor 2b and the case 7 are fixed to each other.

  By doing in this way, in the reactor 2b which is a heating element having a considerable heat among the electric parts constituting the inverter, the iron case 7 is cooled by the cooling air, and the heat of the case 7 is transferred to the housing by heat conduction. Since it is deprived of 3a, it is cooled to the required temperature. Further, since the reactor 2b is drawn out from the inverter main body, the amount of heat generated in the inverter is also reduced accordingly, and it is not necessary to provide a cooling mechanism in the inverter main body (inverter with the reactor drawn out).

  Therefore, since the reactor 2b is not built in and the cooling mechanism is unnecessary, the size of the inverter main body can be reduced, and when the electric motor 3 to which the case 7 is attached is housed in the package, the case 7 is conventionally a dead space. (As shown in FIG. 2B, when the cylindrical motor 3 is arranged in the rectangular space 10, the four corners of the rectangle become the dead space 11, but this dead It can be arranged so that the case 7 comes to the space portion.) As a result, a large-capacity motor can be accommodated in the package.

  In the embodiment shown in FIG. 2, the box-shaped hollow case 7 made of iron is fixed to the outer periphery of the housing 3a of the electric motor 3, and the reactor 2b is fixed to the upper end surface in the case 7, that is, the side opposite to the housing 3a. . This is because the electric motor 3 is also a heating element, so that the heat of the electric motor 3 is prevented from being conducted to the reactor 2b side.

  However, if the cooling fan 9 is a large-capacity fan and the cooling rate is high and the motor 3 is sufficiently cooled, or if the amount of heat generated by the motor 3 itself is small, the second embodiment of FIG. As shown in the embodiment, the cooling efficiency is higher when the reactor 2b is fixed in the case 7 so as to be in close contact with the housing 3a.

  FIG. 4 is a configuration diagram of an inverter drive motor according to the third embodiment of the present invention. In the embodiment of FIG. 1, the reactor 2 b is housed in the case 7, is closely fixed to the housing of the electric motor 3, and is cooled with cooling air. However, drawing out from the inverter is not limited to the reactor 2b, and it goes without saying that other inverter components 8 may be used.

  Moreover, although it is preferable to fix the component pulled out from the inverter to the structural body of the electric motor 3 like 1st Embodiment, the structural body of the electric motor 3 is not restricted to the housing 3a part, The location which cooling air hits efficiently If so, anywhere. Further, it is not necessarily fixed to the motor structure, and may be a remote location as long as the cooling by the motor cooling mechanism can be used.

  In the embodiment shown in FIG. 1, the reactor 2 b is pulled out from the inverter 2, but the reactor 2 b is a considerable heating element, and there is a risk that an operator or the like may accidentally touch and burn if placed with the reactor 2 b exposed. And stored in the case 7. The same applies to the case where other electrical components are pulled out from the inverter 2 and arranged, and if there is a risk that the temperature of the electrical component 8 reaches a required temperature or more, it is stored in the case 7 as shown in FIG. As long as it is necessary, if it is an electrical component which does not have a possibility of reaching the temperature regulated by law, it can be arranged without being housed in the case as shown in FIG. When the case is not used in this way, the cooling air directly cools the electrical component 8, so that the cooling efficiency is increased.

It is a lineblock diagram of the inverter drive motor concerning a 1st embodiment of the present invention. It is the fragmentary sectional view (a) and end elevation (b) of the electric motor shown in FIG. It is a block diagram of the inverter drive motor which concerns on 2nd Embodiment of this invention. It is a block diagram of the inverter drive motor which concerns on 3rd Embodiment of this invention. It is a block diagram of the inverter drive motor which concerns on 4th Embodiment of this invention. It is a block diagram of the inverter drive motor which concerns on 5th Embodiment of this invention. It is a general circuit diagram of an inverter. It is a general block diagram of the electric motor driven with an inverter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Power supply, 2 ... Inverter, 2b ... Reactor, 3 ... Electric motor (motor), 3a
... Housing, 3b, 3c ... End bracket, 3d, 3e ... Bearing, 3f ... Rotating shaft, 3g ... Rotor, 3h ... Stator, 3i ... End cover, 4a, 4b, 4c ... Wiring, 7 ... For storing electrical components Case, 8 ... electric parts, 9 ... cooling fan, 11 ... dead space.

Claims (7)

In an inverter drive motor comprising an inverter, an electric motor driven by the inverter, and a first wiring connecting the inverter to the electric motor, an electrical component constituting the inverter is a second from a housing case of the inverter. An inverter-driven electric motor, wherein the electric motor is pulled out to the outside through wiring and is fixed to a component of the electric motor. 2. The inverter drive motor according to claim 1, wherein the electrical component drawn out to the outside is a reactor constituting the inverter. 3. The inverter drive motor according to claim 1, wherein the electric component fixed to the component is covered with a case for the electric component. 4. The inverter-driven electric motor according to claim 3, wherein the electric component is fixed in close contact with the component body in a case for the electric component. 4. The electrical component according to claim 3, wherein the electrical component is fixed to the structural body by being spaced from the structural body and fixed in close contact with the case in the electrical component case, and the case is secured to the structural body. An inverter-driven electric motor characterized by 6. The inverter-driven motor according to claim 1, wherein the electric motor includes a cooling mechanism, and the electric component is installed at a location where the cooling action of the cooling mechanism reaches. An inverter housed in an inverter housing case, an electric motor having a cooling mechanism and driven by the inverter, and a first wiring connecting the inverter and the electric motor, the inverter, the electric motor, and the electric motor In the inverter drive motor that is used while being housed in the same package with the first wiring, the electrical components constituting the inverter are drawn out from the housing case of the inverter via the second wiring, The inverter-driven electric motor according to claim 1, wherein the second wiring length is a length that allows the electrical component to be installed at a location where the cooling action of the cooling mechanism in the package reaches.

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