JP2004222428A - Power module integrated actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power module integrated actuator wherein the shortening of the actuator in an axial direction, simplifying of wiring and the prevention of miswiring can be achieved simultaneously, while an improvement of heat dissipating performance of a power switching element arranged on a power module part and an actuator is realized. <P>SOLUTION: In the power module integrated actuator, a power module PM wherein a power switching element 11 or the like is included in a cylindrical cabinet 4 is arranged on the circumference of a housing 1. A plurality of heat dissipating fins 8 are arranged which are formed between the housing 1 and the power module PM so as to stretch toward an axial direction, fixed with the housing 1 by bonding, and attached so as to be in contact with the power module PM. Cooling passages 9 are so surrounded with a part between the housing 1 and the power module PM that cooling medium passes parts between the plurality of heat dissipating fins 8. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power module-integrated actuator that integrally includes a power module that incorporates a circuit element that requires heat radiation.
[0002]
[Prior art]
An actuator in which a power module in which a power switching element or the like is mounted on a conventional AC or DC motor is integrated is described in, for example, Patent Document 1.
Patent Literature 1 discloses a motor unit including a stator and a rotor, a rotating shaft that holds the rotor, a cooling fan provided on the non-load side of the rotating shaft, an encoder for detecting the number of rotations directly connected to the rotating shaft, and A motor having a load-side and a non-load-side end bracket for supporting a bearing, and a housing. The motor includes a hollow cylindrical case including an inverter circuit, a case including a control circuit, and a converter circuit. The cases are stacked in multiple stages in the axial direction between the end bracket on the non-load side and the cooling fan and fixed to the end bracket or the housing on the non-load side. With such a structure, miniaturization of the actuator and erroneous wiring between the control circuit and the motor are prevented.
[0003]
[Patent Document 1] Japanese Patent Application Laid-Open No. H11-27903 (specification pages 4 to 5, FIGS. 1 to 6)
[0004]
[Problems to be solved by the invention]
However, the conventional power module integrated actuator has a structure in which the case incorporating the control circuit, the inverter circuit, and the converter circuit is attached between the end bracket on the non-load side and the cooling fan, so that the actuator becomes longer in the axial direction. There was a disadvantage.
Since the power module has a power switching element that requires heat radiation, it is necessary to include a heat sink especially when the output of the motor of the actuator is relatively large. General. In this case, there has been a problem that the heat sink of the actuator and the heat sink of the power module each become large, and sufficient cooling cannot be performed at a joint of a robot or the like having a limitation in the mounting structure of the actuator.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and realizes a power switching element provided in a power module unit, an improvement in heat radiation performance of an actuator, a shortening of an actuator in an axial direction, and simplification of wiring. It is an object of the present invention to provide a power module-integrated actuator capable of simultaneously achieving integration and prevention of incorrect wiring.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a power module integrated actuator according to claim 1 is arranged via a housing, a stator held by the housing and having an armature winding, and a magnetic gap between the stator and the stator. In addition, an actuator including a rotor held on a rotating shaft, a bearing supporting the rotating shaft, an end bracket holding the bearing, and an encoder provided on a non-load side of the rotating shaft. A power module provided on the outer peripheral side of the housing and having a built-in power switching element or the like in a cylindrical housing, formed so as to extend in the axial direction between the housing and the power module, and A heat release member comprising a plurality of high heat conductive members fixed to one of the housing or the power module and attached to contact the other. And the fin, in which a cooling passage formed so as to pass the refrigerant between the plurality of heat radiating fins are enclosed between the housing and the power module.
According to a second aspect of the present invention, in the power module-integrated actuator according to the first aspect, a cooling fan is provided on one of a load side and a non-load side of the rotating shaft.
According to a third aspect of the present invention, in the power module-integrated actuator according to the first aspect, a case having a built-in wiring between the encoder and the power module is attached adjacent to the end bracket on the non-load side. is there. According to a fourth aspect of the present invention, in the power module-integrated actuator according to any one of the first to third aspects, a heat pipe is built in the cooling passage, and a heat radiating portion of the heat pipe is provided outside the actuator. A heat sink is provided.
According to a fifth aspect of the present invention, in the power module-integrated actuator according to any one of the first to fourth aspects, a gear box is attached to a load side of the rotating shaft.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1A and 1B show a power module integrated type actuator according to a first embodiment of the present invention, wherein FIG. 1A is a cross-sectional view thereof, and FIG. 1B is a front cross-sectional view of a state where a power module, a radiation fin and a housing are assembled. is there. FIG. 2 is an overall perspective view of the power module with the cover removed according to the first embodiment. FIG. 3 is a perspective view of a case incorporating wiring between the encoder and the power module according to the first embodiment.
In the figure, 1 is a housing, 2 is a stator, 2a is an iron core, 2b is an armature winding, 3 is a rotor, 3a is an iron core, 3b is a rotor conductor, 4 is a housing, 4a is a heat sink, 4b is a radiating fin fitting portion, 4c is a wall portion, 4d is a cover, 5 is a cooling fan, 6 is a rotating shaft, 7 is a baffle plate, 8 is a radiating fin, 9 is a cooling passage, 9a is a refrigerant inlet, 9b Is a refrigerant outlet, 10 is an insulating circuit board, 11 is a power switching element, 12 is a drive IC, 13 is an insulating / radiating gel, 14 is a case, 15 is an encoder, 16 is a connector pin constituting an input / output terminal, 17 Is a PWM signal and power input / output line, 19 is a bearing, 20 is a load side end bracket, and 21 is a non-load side end bracket.
[0008]
The features of the present invention are as follows.
As shown in FIGS. 1A and 1B, the power module-integrated actuator basically includes a motor unit including a stator 2 and a rotor 3, a rotating shaft 6 for holding the rotor 3, A cooling fan 5 provided on the non-load side of the rotating shaft 6; a rotational speed detecting encoder 15 directly connected to the rotating shaft 6; load-side and non-load-side end brackets 20 and 21 supporting a bearing 19; 1. Here, the stator 2 shows an example of an induction motor in which an iron core 2a has an armature winding 2b, and the rotor 3 has an iron core 3a having a rotor conductor 3b.
[0009]
On the outer peripheral side of the housing 1, a power module PM in which a power switching element 11, a drive IC 12, and the like are built in a cylindrical housing 4 is provided. A plurality of radiating fins 8 are formed between the housing 1 and the power module PM so as to extend in the axial direction, and are fixed to the housing 1 by bonding and attached so as to contact the power module PM. Is provided. Further, a cooling passage 9 is formed so as to be surrounded by the housing 1 and the power module PM so that the refrigerant passes between the plurality of radiating fins 8.
[0010]
Next, the power module PM will be described in detail. As shown in FIGS. 1 (a), 1 (b) and 2, the power module PM basically has a regular hexagonal heat sink 4a made of a high heat conductive member having good heat dissipation such as aluminum. A housing 4 that covers the outer periphery of the heat radiating plate 4a and is made of a cover 4d made of a material having a good heat radiating property such as a metal or a resin material, and is mounted on the heat radiating plate 4a via an insulating circuit board 10. And a drive IC 12. A radiating fin fitting portion 4b is formed on the inner diameter side of the radiating plate 4a of the housing, and a power switching element 11 and a drive IC 12 mounted on the radiating plate 4a are formed in six radially extending walls. It is designed to be partitioned by the part 4c. The space inside the housing 4 is filled with an insulating / radiating gel 13.
[0011]
A cooling fan 5 is provided on the load side of the rotating shaft 6 as shown in FIG. 1A. The cooling fan 5 introduces external air into the load-side refrigerant inlet 9a. , Through the cooling passage 9 formed with the power module PM and the radiating fins 8, and discharged from the refrigerant outlet 9b. The air guide plate 7 is fixed to the refrigerant inlet 9a in order to efficiently introduce air for cooling into the refrigerant inlet 9a.
[0012]
Then, as shown in FIG. 1A, a disk-shaped case 14 having a built-in wiring between the encoder 15 and the power modules 11 and 12 is attached to the end bracket 21 on the non-load side as shown in FIG. ing.
As shown in FIG. 3, the case 14 has a circular encoder mounting portion 23 at the center and a refrigerant outlet 9b around the encoder mounting portion 23. The case 14 has a built-in connector hole 22 for receiving an input / output connector pin 16 provided on the power module PM. The connector hole 22 is connected to an external peripheral circuit through the PWM signal and the power input / output line 17. Has become.
[0013]
Next, the operation will be described.
In the power module-integrated actuator, when external air is introduced from the load-side refrigerant inlet 9 a by the cooling fan 5, cooling air flows through the cooling passage 9 formed in the housing 1, the power module PM and the radiation fin 8. As a result, the heat generated in one motor portion is transmitted from the housing 1 through the radiating fins 8 and exchanged with the cooling air in the cooling passage 9, and the heat generated in the other power modules 11 and 12 is transmitted through the radiating plate 4 a. The heat is transmitted to the radiation fins 8 and heat is exchanged by the cooling air in the cooling passage 9.
[0014]
The power module-integrated actuator according to the first embodiment of the present invention includes a power module PM provided on the outer peripheral side of the housing 1 and including the power switching element 11 and the like in the cylindrical housing 4, and the housing 1 and the power module. A radiation fin 8 formed of a plurality of high heat conducting members fixed to one of the housing 1 and the power module PM and formed so as to extend in the axial direction between the PM and the housing 1 or the power module PM; A configuration including a cooling passage 9 formed between the plurality of radiating fins 8 and surrounded by the cooling module 9 and surrounded by the cooling module 1 and the power module PM. Since the configuration in which the fan 5 is provided is employed, the heat radiation between the housing 1 and the power module PM is shared by the radiation fins 8. More, it improves the heat dissipation, attached to the actuator is simple, yet it is possible to shorten the axial direction.
Furthermore, since the case 14 containing the wiring between the encoder 15 and the elements inside the power module PM is mounted adjacent to the end bracket 21 on the non-load side of the housing 1, the wiring between the actuator and the power module is simplified. Erroneous wiring can be prevented.
[0015]
FIG. 4 is a front view showing a state in which a housing with radiation fins is attached to a housing of a power module-integrated actuator according to a second embodiment of the present invention.
The difference of the second embodiment from the first embodiment is that the power module and the power module 28 are integrally formed by replacing the power module and the heat radiation fin of the first embodiment with a separate structure. It is a point that has become.
Specifically, the outer periphery of the radiating fin mounting portion 27 is formed in a planar shape, and the inner side of the radiating fin mounting portion 27 is formed in a circular shape so as to fit with the housing 1. A plurality of radiating fins 29 are mounted on a plane portion of the radiating fin mounting portion 27, and a power module 28 is mounted on the radiating fin 29.
In the second embodiment of the present invention, the power fins 29 and the power module 28 are integrated with each other in place of the power module and the heat fins of the first embodiment being separated from each other. Heat can be efficiently dissipated to the housing. Further, even when the width of the power module is close to the diameter of the actuator and it is difficult to mount the power module around the actuator, the power module can be easily mounted on the actuator.
[0016]
FIG. 5 is a cross-sectional view of a power module-integrated actuator according to a third embodiment of the present invention.
The third embodiment is different from the second embodiment in that a gearbox 24 is mounted on the load side of the rotating shaft, that is, adjacent to the load-side end bracket 20, and the rotating shaft 6 is used as the shaft output from the actuator. is there. Further, a heat pipe module 25 is inserted into the cooling passage 9 described in the first embodiment. The heat absorbing portion of the heat pipe is arranged near the gear box 24 and in the central portion of the motor portion, and guides the absorbed heat from the refrigerant discharge port 9b on the non-load side to the heat sink 26 serving as a heat radiating portion to radiate heat. .
In the third embodiment, the gear unit 24 is mounted on the load side of the actuator. When the cooling fan cannot introduce refrigerant such as air into the refrigerant passages and the radiation fins from the load side, the heat pipe module 25 is radiated. Since it is inserted in the cooling passage between the fins, cooling performance and miniaturization can be achieved at the same time. Further, since the gearbox has a diameter similar to that of the housing 4 of the power module, it is possible to select a wider gear ratio than a gearbox having the same diameter of the conventional actuator.
[0017]
The housing 4 of the power module is not limited to a regular polyhedron, but can be formed of an appropriate plane according to the size of the element. The number of elements to be mounted is set according to the shape and capacity of the actuator. It does not matter.
Further, in the embodiment, the example in which the cooling fan 5 is attached to the load side is shown, but the cooling fan 5 can be attached to the non-load side.
Further, while the mounting position of the cooling fan 5 is fixed to the load side, the mounting directions of the blow-out side and the discharge side are changed, and the direction of the refrigerant is changed from the refrigerant outlet 9b to the refrigerant inlet 9a according to the rotation direction of the fan. It does not matter.
[0018]
【The invention's effect】
As described above, the present invention has the following effects.
A power module-integrated actuator according to a first embodiment of the present invention includes a power module provided on the outer peripheral side of a housing and having a power switching element or the like built in a cylindrical housing, and an axial direction between the housing and the power module. And a radiation fin formed of a plurality of high heat conducting members fixed to one of the housing and the power module and attached to contact the other, and surrounded by the housing and the power module. A configuration including a cooling passage formed so that a refrigerant passes between a plurality of radiation fins, and a configuration in which a cooling fan is provided on one of the load side and the non-load side of the rotating shaft, so that a space between the housing and the power module is provided. The structure allows heat radiation to be shared by the radiation fins, improving heat radiation and Attached to it is simple, yet it is possible to shorten the axial direction.
Furthermore, since the present actuator is configured to mount a case having a built-in wiring between elements inside the encoder and the power module adjacent to the end bracket on the non-load side of the housing, the wiring between the actuator and the power module is simplified. In addition, erroneous wiring can be prevented.
In the second embodiment of the present invention, the power module and the heat fin are separated from each other in place of the structure of the first embodiment, and the heat fin and the power module are integrated. Heat can be efficiently dissipated. Further, even when the width of the power module is close to the diameter of the actuator and it is difficult to mount the power module around the actuator, the power module can be easily mounted on the actuator.
The third embodiment of the present invention has a configuration in which a gear unit is mounted on the load side of an actuator. When a refrigerant such as air cannot be introduced into a refrigerant passage or a radiation fin from a load side by a cooling fan, a heat pipe module is mounted. Since it is inserted in the cooling passage between the radiation fins, cooling performance and miniaturization can be achieved at the same time. In addition, since the gear box has a diameter approximately equal to that of the housing of the power module, it is possible to select a wider gear ratio than a gear box having the same diameter of a conventional actuator.
[Brief description of the drawings]
FIG. 1 is a power module-integrated actuator showing a first embodiment of the present invention, wherein (a) is a cross-sectional view thereof, and (b) is a front cross-sectional view of a state where a power module, a radiation fin and a housing are assembled. It is.
FIG. 2 is an overall perspective view of the power module with a cover removed according to the first embodiment.
FIG. 3 is a perspective view of a case incorporating wiring between the encoder and the power module according to the first embodiment.
FIG. 4 is a front view showing a state in which a housing with a radiation fin is attached to a housing of a power module-integrated actuator according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view of a power module-integrated actuator according to a third embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Stator 2a Iron core 2b Armature winding 3 Rotor 3a Iron core 3b Rotor conductor 4 Housing 4a Heat sink 4b Heat sink fin fitting part 4c Wall 4d Cover 5 Cooling fan 6 Rotating shaft 7 Wind guide plate Reference Signs List 8 radiating fin 9 cooling passage 9a refrigerant inlet 9b refrigerant outlet 10 insulating circuit board 11 power switching element 12 drive IC
13 Gel for insulation and heat dissipation 14 Case 15 Encoder 16 Connector pin (input / output terminal)
17 PWM signal and power input / output line 19 Bearing 20 End bracket (load side)
21 End bracket (anti-load side)
22 Connector hole (input / output terminal receiver)
23 Encoder mounting part 24 Gear box 25 Heat pipe module 26 Heat sink 27 Radiation fin mounting part 28 Power module 29 Radiation fin PM Power module

Claims (5)

A housing,
A stator having an armature winding held by the housing;
Along with being arranged via the stator and the magnetic gap, a rotor held on a rotating shaft,
A bearing that supports the rotating shaft;
An end bracket for holding the bearing,
An actuator provided with an encoder provided on the non-load side of the rotating shaft,
A power module provided on the outer peripheral side of the housing and including a power switching element and the like in a cylindrical housing;
A heat radiator comprising a plurality of high heat conducting members formed so as to extend in the axial direction between the housing and the power module, and fixed to one of the housing or the power module and attached to contact the other. A power module-integrated actuator, comprising: a fin; and a cooling passage surrounded by the housing and the power module, the cooling passage being formed between the plurality of radiating fins to allow a refrigerant to pass therethrough. The power module integrated actuator according to claim 1, wherein a cooling fan is provided on one of the load side and the non-load side of the rotating shaft. The power module-integrated actuator according to claim 1, wherein a case containing a wiring between the encoder and the power module is mounted adjacent to the end bracket on the non-load side. The power module integrated actuator according to any one of claims 1 to 3, wherein a heat pipe is built in the cooling passage, and a heat sink serving as a heat radiating portion of the heat pipe is provided outside the actuator. . The power module-integrated actuator according to any one of claims 1 to 4, wherein a gear box is attached to a load side of the rotating shaft.

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