JPH11299178A - Inverter-driven motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the efficiency of cooling and the reliability of an inverter- driven motor higher, and to reduce its size and cost as well. SOLUTION: An inverter driven motor is composed of an inverter 2 housed in a case, a motor 3 having a cooling mechanism 9 and driven by the inverter 2, distributing wires 4b for connecting the inverter 2 and the motors 3, heating components 2b being a part of heating components 2b out of electric components constituting the inverter 2, drawn out to the outside of the above-mentioned case, and fixed to a constituent substance of the motor 3, and distributing wires 4c for connecting the inverter 2 and the heating components 2b. Since heating bodies constituting the inverter 2 are drawn out to the outside of the inverter and cooled by the cooling fan 9 of the motor, it becomes possible to reduce the size of the inverter, and to make the efficiency of cooling higher. Accordingly, it becomes possible to enhance the reliability of the inverter, and to constitute it at a low cost as well, since there is no need to add any special apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter drive motor comprising an inverter and a motor driven by the inverter, and more particularly to an inverter drive motor which is inexpensive and excellent in cooling performance.

[0002]

2. Description of the Related Art FIG. 8 is a general block diagram of a system for driving a motor by an inverter. The output of the power supply 1 and the input of the inverter 2 are connected by a wiring 4a.
And an electric motor (motor) 3 are connected by a wiring 4b. The inverter 2 converts the power taken from the power supply 1 into required power, supplies the converted power to the motor 3, and drives the motor 3 at a required rotation speed.

FIG. 7 is a general configuration diagram of the inverter 2. The inverter 2 includes a rectifier circuit unit 2a for converting AC power taken from the power supply 1 into DC power, and a rectifier circuit unit 2a.
reactor 2b and capacitor 2c for smoothing the DC converted by a, and control unit 2d;
conversion unit 2e for converting into AC power based on a command from
It is composed of

[0004] The motor driven by the configuration shown in FIG.
Since the rotation speed is controlled based on a command from the control unit 2e, it is possible to save power. In addition, as a thing related to the electric motor driven by the inverter, for example,
JP-A-5-83899 and JP-A-62-23989
No. 6 publication.

[0005]

Devices driven by an electric motor (motor), such as an air conditioner, an outdoor unit of an air conditioner, a pump, a washing machine, and a fan device, are designed to save energy and facilitate control. In recent years, inverter-driven devices as described above have become mainstream. These devices are
On the other hand, there is a high demand for higher output and smaller size, and a large capacity motor, inverter, and other components are often housed in a small package.

As a conventional product, there is one in which an inverter is integrally formed on the back of a motor. In this case, the size can be reduced as compared with the case where the size of the inverter and the size of the motor are combined. However, there is a problem that, in addition to the problem that the cost is increased when such an integrated product is used, space saving cannot be achieved.

[0007] Since an inverter-integrated electric motor is larger than an electric motor alone, if it is combined with other components such as a fan device and an impeller to be housed in one package, This is because the package in the package becomes poor, and a large package is required.

In the case where the inverter, the electric motor, and other components are stored in the package, if the individual components are small, they can be stored in the package without any gaps. However, on the other hand, if the inverter, which is a heating element, and the electric motor, which is also a heating element, are housed separately in one package, a dedicated cooling mechanism is required for each heating element, and each of the heating elements has There is a problem that the structure becomes large.

An object of the present invention is to provide an inexpensive and compact inverter drive motor having high cooling efficiency and high reliability without providing a cooling mechanism in the inverter.

[0010]

The object of the present invention is to provide an inverter housed in a case, a motor having a cooling mechanism and driven by the inverter, and a first wiring connecting the inverter and the motor. A second heat-generating component connected to the inverter and the heat-generating component, the heat-generating component being a part of the heat-generating component of the electric components constituting the inverter and being drawn out of the case and fixed to the structure of the electric motor; This is achieved by having a configuration including the above wiring.

Since the heat-generating components that constitute the inverter and are drawn out 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 stored in a small package, the cooling efficiency does not decrease, and a highly reliable, inexpensive and small inverter-driven motor can be configured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of the inverter drive motor according to the first embodiment of the present invention. The inverter-driven motor according to this embodiment is configured such that the AC power supply 1
And an electric motor 3 connected to the inverter 2 via a wiring 4b.

The upper half of the electric motor 3 is shown in FIG.
As shown in (a), the openings at both ends of the cylindrical housing 3a are closed by end brackets 3b and 3c, respectively, and the shaft 3f is provided by bearings 3d and 3e provided at the center portions of both end brackets 3b and 3c. Are rotatably held. The central portion of this rotating shaft 3f (housing 3a
(Inside), a rotor 3g is fixedly mounted, and a housing 3a is provided.
The stator 3h is fixedly mounted on the inner peripheral surface of the.

The rotating shaft 3 is not only on its front side (end bracket 3b side) but also on its back side (end bracket 3c side).
Side), the cooling fan 9 is fitted to the rear-side protruding portion of the rotating shaft 3f, and the cooling fan 9 rotates with the rotation of the rotating shaft 3f to generate cooling air. . An end cover 3i is provided so as to change the direction of the cooling air toward the housing 3a and prevent the maintenance personnel from being injured by the cooling fan 9 which rotates by mistake.

In the present embodiment, the reactor 2b shown in FIG. 7 constituting the inverter is pulled out of a case (not shown) containing the inverter, and the housing 3
(a) The reactor 2b is fixed in a case 7 fixed to the outer peripheral portion, and the reactor 2b and the inverter main body are connected by a wiring 4c. It is preferable that the reactor 2b and the case 7 be fixed so that they are in close contact with each other in terms of heat conduction.

By doing so, the reactor 2b, which is a heating element having considerable heat among the electric components constituting the inverter, cools the case 7 made of iron by the cooling air, and heat conduction of the case 7 Since heat is taken by the housing 3a, it is cooled to a required temperature. Further, since the reactor 2b is drawn out of the inverter main body, the calorific value of the inverter is also reduced accordingly, and it is not necessary to provide a cooling mechanism in the inverter main body (the inverter from which the reactor is drawn out).

Accordingly, the size of the inverter body can be reduced because the reactor 2b is not built-in and a cooling mechanism is not required. Further, when the motor 3 with the case 7 is housed in a package, the case 7 is Can be placed in the dead space (Fig. 2
As shown in (b), when the columnar motor 3 is arranged in the rectangular space 10, the four corners of the rectangle are dead spaces 11.
However, the case 7 can be arranged so as to come to this dead space portion. ), A large-capacity motor or the like can be stored in the package.

In the embodiment shown in FIG. 2, a 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, on the side opposite to the housing 3a. doing. this is,
Since the electric motor 3 is also a heating element, it is to prevent the heat of the electric motor 3 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, FIG. As shown in the second 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 a third embodiment of the present invention. In the embodiment shown in FIG. 1, the reactor 2b is housed in the case 7, is fixed to the housing of the electric motor 3, and is cooled by cooling air. However, it is reactor 2
It is needless to say that the present invention is not limited to b and other inverter components 8 may be used.

Further, it is preferable to fix the parts drawn from the inverter to the structure of the motor 3 as in the first embodiment, but the structure of the motor 3 is not limited to the housing 3a, and the cooling air is efficiently cooled. It may be anywhere as long as it hits the target. Furthermore, it is not always necessary to fix to the electric motor structure, and a remote place may be used as long as cooling by the electric motor cooling mechanism can be used.

In the embodiment shown in FIG. 1, the reactor 2b
Was pulled out of the inverter 2 but the reactor 2
b is a considerable heating element and if this is exposed and placed, there is a risk that workers etc. may accidentally touch and burn.
It was stored in case 7. The same applies to the case where other electric components are drawn out of the inverter 2 to the outside and arranged. If there is a risk that the temperature of the electric component 8 reaches a required temperature or higher, it is stored in the case 7 as shown in FIG. Although it is necessary, if the electric component is not likely to reach the temperature or more regulated by the law, as shown in FIG. 6, it can be arranged without being housed in the case. When the case is not used, the cooling air directly cools the electric component 8, so that the cooling efficiency is increased.

[0023]

According to the present invention, since the electric parts constituting the inverter are drawn out of the inverter and fixed to the structure of the motor or installed at a place where the cooling operation of the motor cooling mechanism can reach, the cooling mechanism is provided on the inverter itself. It is possible to reduce the size by eliminating the need to provide a motor, so that the entire device using the inverter-driven motor can be compactly stored in one package, and a large-capacity motor can be stored even in a package of the same size. It is possible, and the reliability is improved because of the high cooling efficiency. Further, there is an effect that the cost can be reduced because a special device is not newly provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an inverter drive motor according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view (a) and an end view (b) of the electric motor shown in FIG.

FIG. 3 is a configuration diagram of an inverter drive motor according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of an inverter drive motor according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of an inverter drive motor according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram of an inverter drive motor according to a fifth embodiment of the present invention.

FIG. 7 is a general circuit diagram of an inverter.

FIG. 8 is a general configuration diagram of a motor driven by 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: case for storing electric parts, 8: electric parts, 9: cooling fan, 11: dead space.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takuya Kawashima 7-1-1 Higashi Narashino, Narashino City, Chiba Prefecture Inside the Industrial Equipment Division, Hitachi, Ltd. (72) Inventor ▲ Yanagi ▼ Eiji Tadashi 7-chome Higashi Narashino, Narashino City, Chiba Prefecture No. 1-1 Hitachi Industrial Machinery Division (72) Inventor Tsunehiro Endo 7-1-1 Higashi Narashino, Narashino City, Chiba Prefecture Inside Hitachi Industrial Co., Ltd. 7-1-1 Narashino Industrial Equipment Division, Hitachi, Ltd. (72) Inventor Yoshiyuki Taguchi 7-1-1, Higashi-Narashino, Narashino City, Chiba Pref.

Claims (7)

[Claims] 1. An inverter drive motor comprising an inverter, a motor driven by the inverter, and first wiring connecting the inverter to the motor, wherein an electric component forming the inverter is used for storing the inverter. An inverter-driven motor, which is drawn out of the case via a second wiring and fixed to a structure of the motor. 2. The inverter-driven electric motor according to claim 1, wherein the electric component drawn out to the outside is a reactor constituting the inverter. 3. The inverter-driven motor according to claim 1, wherein the electric component fixed to the structure is covered by 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 side in the case for the electric component. 5. The electric component according to claim 3, wherein the electric component is separated from the component in a case for the electric component and is fixed in close contact with the case, and the case is fixed to the component. An inverter-driven motor fixed to a structure. 6. The inverter-driven electric motor according to claim 1, wherein the electric motor has a cooling mechanism, and the electric component is installed at a location where the cooling action of the cooling mechanism can be performed. . 7. An inverter comprising: an inverter housed in an inverter housing case; a motor having a cooling mechanism driven by the inverter; and first wiring connecting the inverter and the motor. And the electric motor and the first wiring are housed in the same package for use in an inverter drive motor, wherein the electric components constituting the inverter are externally connected via a second wiring from a housing case of the inverter. An inverter-driven electric motor, wherein the second wiring length is long enough to allow the electric component to be installed at a location in the package where the cooling function of the cooling mechanism can reach.