JPH09285056A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor including an inverter as a drive unit with a small installing space, and no fear of noise interference trouble, along with easy connection work by eliminating a connecting conduction wire. SOLUTION: A drive unit 14 as an inverter is mounted on a circuit board 12. The circuit board 12 is connected to a terminal part 11a of a coil 11 and fixed at a coil end 11b of a stator coil 11. In this way the driving device 14 is fixed in a nearest position to the end coil 11b of the stator coil 11, while the driving device 14 is connected directly to the terminal part 11a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a drive device such as an inverter.

[0002]

2. Description of the Related Art Conventionally, a motor having a drive device such as an inverter has been provided. In this case, the drive device is generally placed side by side on the motor, and in recent years, some drive devices are mounted outside the frame of the motor. Also, they are connected by a conductive wire such as a cable.

[0003]

Of the above-mentioned conventional ones, not only those in which the driving devices are arranged side by side on the motor but also those mounted on the outside of the frame of the motor have a large total size. Therefore, it required a large space for installation. Also, a separate conductive wire is required to connect the motor and the drive device, and furthermore, it is necessary to select a conductive wire that meets the ratings of the motor and the drive device before the connection, which is troublesome. .

[0004] Then, the connection operation itself by the conductive wire,
One end must be connected to the output terminal of the drive, and the other end must be connected to the input terminal of the motor. Particularly in a three-phase motor, it is necessary to connect both ends of each phase. It was really troublesome.

In addition, a so-called microsurge having a high peak value and a short pulse width is generated at the terminal of the coil of the motor. The microsurge propagates through the conductive line and is emitted from the conductive line to other devices as noise. There is a problem,
In addition, there has been a problem that noise generated from other devices easily enters the conductive wire.

The present invention has been made in view of the above circumstances, and therefore an object of the present invention is to provide a drive device such as an inverter so that the installation space can be reduced and a conductive wire for connection and It is an object of the present invention to provide a motor that can eliminate the need for selection work, facilitate connection work, and solve the problem of noise transfer.

[0007]

In order to achieve the above object, the motor of the present invention comprises a circuit board on which a driving device such as an inverter is mounted, and the circuit board is provided with a coil at the coil end of the stator coil. It is characterized in that it is connected and fixed to the terminal unit. According to this one,
The driving device is directly connected to and fixed to the end portion of the coil, which is closest to the coil end of the stator coil inside the motor.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 2 shows the overall configuration of a motor (in this case, a three-phase induction motor), and a motor case 1 is composed of a frame 2 and brackets 3 and 4 connected to both ends of the frame 2 in the axial direction. A stator 5 is fixed to the inner peripheral portion of the frame 2, and a rotor 7 having a rotating shaft 6 supported by brackets 3 and 4 is disposed in the internal space of the stator 5. Further, a cooling fan 8 is attached to the end of the rotary shaft 6 protruding from the bracket 3 on the side opposite to the load side, and a fan cover 9 surrounding the cooling fan 8 is attached.
Is attached to the bracket 3.

Here, the stator 5 is composed of a stator core 10 and a stator coil 11 mounted on the stator core 10, and a terminal portion 11a of the stator coil 11 extends from one coil end 11b (left side in the figure). It has a slight protrusion. On the other hand, the circuit board 12 has, for example, a ring shape as shown in FIG. 3, and the fitting insertion holes 13 are fitted into the terminal portions 11a of the stator coils 11 at three places which are arranged at substantially equal intervals. Therefore, in this case, three terminal portions 11a of the stator coil 11 also exist at substantially equal intervals.

Further, on the surface of the circuit board 12 opposite to the stator coil 11 side, for example, three driving devices 14 such as inverters (in this case, for each phase of U, V, W) unit circuits 14a,
14b and 14c are separately mounted, and a power receiving terminal 15 for receiving commercial power from the outside is provided at one location on the outer periphery of the same surface.
Although not shown in the figure, wiring for connecting the power receiving terminal 15 to the unit circuits 14a, 14b, 14c of the driving device 14, and the unit circuits 14a, 14b, 14
wiring for connecting c to each other, and unit circuits 14a, 14
Wiring patterns for connecting the b and 14c and the fitting hole 13 are provided on the circuit board 12 by printing, for example. The fitting insertion hole 13 portion in the wiring is a connection portion such as a land and a through hole. The drive unit 14 also includes a power supply circuit for rectifying and smoothing an external power supply received by the power receiving terminal 15.

With this structure, the circuit board 12 has the insertion hole 13 and the terminal portion 11a of the stator coil 11 as shown in FIG.
Then, the solder 16 is applied from the tip of the terminal portion 11a protruding from the fitting insertion hole 13 to the connection portion around the fitting insertion hole 13, and thus the circuit board 12 is attached to the stator coil 1
The end portion 1 of the coil 11 at the coil end 11b of No. 1
It is connected and fixed to 1a.

In the case of such a structure, the driving device 14 is arranged and fixed inside the motor together with the circuit board 12, and is not located outside the motor.
Since it is arranged closest to the coil end 11b of the stator coil 11 even when it is arranged inside the motor, it is not necessary to make the motor case 1 large, and even if it is made large, it is only a little. Thus, the overall size of the motor including the drive device 14 can be kept small, and the installation space can be reduced.

Further, the driving device 14 is directly connected to the terminal portion 11a of the stator coil 11 by the circuit board 12, so that a conductive wire for connection is not required separately, and the motor and the driving device 14 can be connected before the connection. Eliminates the effort of selecting a conductive wire that matches the rating. In addition, it is possible to eliminate the trouble of connecting both ends of the conductive wire to the motor and the drive device 14 one by one. Especially, in a three-phase motor, the connection of both ends of the individual conductive wires for each phase can be eliminated. It is possible to eliminate the trouble, and the connection work can be greatly facilitated.

Further, as described above, since the conductive wire is not required to connect the drive unit 14 and the motor, it is possible to prevent the noise from being emitted from the conductive wire. Can be prevented from penetrating through the conductive wire.

FIG. 4 shows the circuit board 18 on which only the power receiving terminal 17 is mounted and the driving device 14 is not mounted. For a motor driven by a commercial power source, the above circuit board 12 is used instead. The lever circuit board 18 is attached to the stator coil 11
It is used by being fixedly connected to the terminal portion 11a of.

In contrast to the above, FIG. 5 shows a second embodiment of the present invention, in which the terminal portion 11a of the stator coil 11 is connected and fixed to the circuit board 12 in place of the solder 16 described above. The nut 20 is screwed into the thread groove 19 formed in 11a. Even in this case, the same operation and effect as described above can be obtained.

FIG. 6 shows a third embodiment of the present invention.
Coil end 11b of circuit board 12 and stator coil 11
And a spacer 21 having a heat insulating property is interposed between and. According to this, the stator coil 11
It is possible to reduce the amount of heat generated by the heat transfer to the drive device 14 and reduce the influence of the heat. Further, in this case, by making the spacer 21 not only thermally insulating but also elastic (for example, rubber), it is possible to reduce the transmission of the vibration generated in the stator coil 11 to the driving device 14, The influence of vibration can also be reduced.

FIG. 7 shows a fourth embodiment of the present invention.
The circuit board 22 has a shape having an extension portion 22a extending to the stator core 10 side on the inner peripheral portion and an extension portion 22b extending to the non-stator core 10 side on the outer peripheral portion, and the extension portion 22a of the inner peripheral portion is formed. While surrounding the inner circumference of the coil end 11b of the stator coil 11, the coil end 11b is pressed, and in this state, the extension portion 22b of the outer peripheral portion is attached to the frame 2 of the motor case 1.
Is fixed to the coil end 11b with a screw 23, for example.
The thing which was made to shape is shown.

According to this, the circuit board 22 can be used also as a molding member for molding the coil end 11b of the stator coil 11, and accordingly, it contributes further to the downsizing of the motor and the installation space. be able to. In this case, the coil end 11b can also be protected by the circuit board 22. In this case, the circuit board 22 presses the coil end 11b.
May not be fixed to the frame 2 of the motor case 1, but may be performed by pressing the circuit board 22 with a protrusion or the like provided on the bracket 3, for example.

FIG. 8 shows a fifth embodiment of the present invention.
The power element 23 such as a transistor of the driving device 14 mounted on the circuit board 12 is provided in contact with the frame 2 of the motor case 1. According to this, heat generated by the power element 23 is applied to the frame 2 of the motor case 1.
Therefore, the cooling air generated by the cooling fan 8 can be used for cooling, and the performance of the drive device 14 can be improved.

FIG. 9 shows a sixth embodiment of the present invention.
When the motor is, for example, a brushless motor, the circuit board 24 is provided with an extension portion 24a located near the rotary shaft 6, and the extension portion 24a is provided corresponding to the detected object (for example, a permanent magnet) 25 provided on the rotary shaft 6. A sensor (for example, a Hall element) 26 that detects the rotational position of the rotor 7 is mounted. According to this, the mounting of the sensor 26 to the wiring can be done with the circuit board 24, and it is possible to avoid the need for a separate mounting / wiring member, and also to downsize the motor and eventually to reduce the installation space. It can further contribute.

FIG. 10 shows a seventh embodiment of the present invention, in which the coil end 11b of the stator coil 11 to the circuit board 12 and the driving device 14 are covered with a resin mold 27. According to this one, the drive device 14
To the frame 2 of the motor case 1 can be improved, and in addition, the electrical insulation, vibration resistance, and
Also, the environment resistance and the like can be improved.

[0023]

The present invention is as described above.
The following effects are obtained. According to the motor of claim 1, in the one having a drive device such as an inverter, the installation space can be reduced, and the conductive wire for connection and the selection work thereof can be eliminated, and the connection work can be performed. Can be facilitated and the problem of noise transfer can be solved.

According to the motor of the second aspect, it is possible to reduce the influence of heat from the stator coil on the drive device. According to the motor of claim 3, the installation space can be further reduced. According to the motor of the fourth aspect, the heat generated by the power element can be transferred to the frame to be cooled, and the performance thereof can be made excellent.

According to the motor of the fifth aspect, a separate mounting / wiring member is not required for mounting / wiring the sensor for detecting the rotational position of the rotor, which can further contribute to the reduction of the installation space.

According to the sixth aspect of the present invention, the thermal conductivity from the drive unit to the frame can be improved, and the electric insulation, vibration resistance, environment resistance and the like of the drive unit can also be improved.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional side view of a main part showing a first embodiment of the present invention.

FIG. 2 is a side view of the motor in a cross-section of the upper half thereof.

FIG. 3 is a front view of the circuit board.

FIG. 4 is a front view of a different circuit board.

FIG. 5 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 6 is a view corresponding to FIG. 1, showing a third embodiment of the present invention.

FIG. 7 is a diagram corresponding to FIG. 1 showing a fourth embodiment of the present invention.

FIG. 8 is a view corresponding to FIG. 1 showing a fifth embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 1 showing a sixth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 1, showing a seventh embodiment of the present invention;

[Explanation of symbols]

2 is a frame, 11 is a stator coil, 11a is a terminal portion of the stator coil, 11b is a coil end, 12 is a circuit board, 14 is a driving device, 16 is solder, 20 is a nut, 21
Is a spacer, 22 is a circuit board, 23 is a power element, 24
Is a circuit board, 26 is a sensor, and 27 is a resin mold.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshio Sugishita 2-4 Suehiro-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Stock company Toshiba Keihin office

Claims (6)

[Claims] 1. A motor comprising a circuit board on which a driving device such as an inverter is mounted, and the circuit board is connected to and fixed to a terminal portion of a coil at a coil end of a stator coil. 2. The motor according to claim 1, wherein a spacer having a heat insulating property is interposed between the circuit board and the coil end of the stator coil. 3. The motor according to claim 1, wherein the circuit board is also used as a molding member for molding the coil end of the stator coil. 4. The motor according to claim 1, wherein the power element mounted on the circuit board is provided in contact with the frame. 5. The motor according to claim 1, wherein a sensor for detecting a rotational position of the rotor is mounted on the circuit board. 6. The motor according to claim 1, wherein the circuit board and the driving device are covered with a resin mold from the coil end of the stator coil.