WO2013161521A1

WO2013161521A1 - Driver-integrated motor

Info

Publication number: WO2013161521A1
Application number: PCT/JP2013/060042
Authority: WO
Inventors: 月岡靖幸; 倉本雅哉
Original assignee: 日本電産サンキョー株式会社
Priority date: 2012-04-23
Filing date: 2013-04-02
Publication date: 2013-10-31
Also published as: JP2013226015A; JP6017823B2

Abstract

Provided is a driver-integrated motor capable of suppressing temperature increases in electronic parts mounted on a circuit board as caused by heat produced by the motor body, and temperature increases in the electronic parts as caused by heat produced by the driver unit. Specifically, the driver-integrated motor (1) is provided with a motor main body (2), a driver unit (3), and a medial member (4) disposed between the motor main body (2) and the driver unit (3). In the driver-integrated motor (1), when the exhaust heat amount of the driver unit (3) is greater than the exhaust heat amount of the motor main body (2), a medial member (4) formed of a member having heat conductivity equal to or higher than the heat conductivity of the case body (15) of the driver unit (3), is disposed between the motor main body (2) and the driver unit (3), and when the exhaust heat amount of the motor main body (2) is greater than the exhaust heat amount of the driver unit (3), a medial member (4) formed of a member having heat conductivity lower than the heat conductivity of the case body (15) is disposed between the motor main body (2) and the driver unit (3).

Description

Driver integrated motor

The present invention relates to a driver integrated motor in which a motor body and a driver are integrated.

Conventionally, a driver-integrated motor in which a motor body and a driver are integrated is known (see, for example, Patent Document 1). In the driver integrated motor described in Patent Document 1, the driver unit includes a circuit board on which electronic components such as a power transistor are mounted, and a case body in which the circuit board is accommodated. In this driver-integrated motor, the motor main body and the driver are connected via a support column, and a gap is formed between the motor main body and the driver. Therefore, in this driver-integrated motor, heat transfer between the motor body and the driver is suppressed.

JP 2004-201415 A

When the temperature of the electronic component mounted on the circuit board exceeds the allowable temperature, the electronic component may not function normally, so it is necessary to suppress the temperature rise of the electronic component. In the driver-integrated motor of Patent Document 1, heat transfer between the motor main body and the driver is suppressed, so that it is possible to suppress the temperature rise of electronic components due to the heat generated in the motor main body. is there. However, in this driver-integrated motor, the heat generated in the driver section cannot be efficiently released to the motor main body section, so it is difficult to suppress the temperature rise of the electronic components due to the heat generated in the driver section. is there.

Therefore, an object of the present invention is to suppress the temperature rise caused by the heat generated in the motor main body portion and the temperature rise caused by the heat generated in the driver portion of the electronic component mounted on the circuit board. The object is to provide a driver integrated motor.

In order to solve the above-described problems, a driver-integrated motor according to the present invention includes a motor body having a rotor and a stator, a circuit board on which a drive circuit for driving the rotor is mounted, and a case in which the circuit board is accommodated. A driver unit having a body, and an intermediate member disposed between the motor main body unit and the driver unit, and when the heat generation amount of the driver unit is larger than the heat generation amount of the motor main body unit, the heat of the case body When an intermediate member formed of a member having a thermal conductivity equal to or higher than the conductivity is disposed between the motor body and the driver part, and the heat generation amount of the motor body part is larger than the heat generation amount of the driver part, the case An intermediate member formed of a member having a thermal conductivity lower than that of the body is disposed between the motor main body portion and the driver portion.

In the driver-integrated motor of the present invention, when the heat generation amount of the driver portion is larger than the heat generation amount of the motor main body portion, an intermediate member formed of a member having a thermal conductivity equal to or higher than that of the case body is used as the motor. It is arranged between the main body part and the driver part, and when the calorific value of the motor main body part is larger than the calorific value of the driver part, it is formed of a member having a thermal conductivity lower than that of the case body. An intermediate member is disposed between the motor body and the driver. For this reason, when the amount of heat generated in the driver section is large, it is possible to efficiently release the heat generated in the driver section to the motor body, and as a result, in the driver section of the electronic component mounted on the circuit board. It becomes possible to suppress the temperature rise caused by the generated heat. In addition, when the heat generation amount of the motor main body is large, it is possible to suppress the heat generated in the motor main body from being transmitted to the driver section. As a result, the electronic components mounted on the circuit board can be prevented. It becomes possible to suppress the temperature rise caused by the heat generated in the motor main body. As described above, according to the present invention, it is possible to suppress the temperature rise caused by the heat generated in the motor main body portion and the temperature rise caused by the heat generated in the driver portion of the electronic component mounted on the circuit board. Become.

In the present invention, if only the intermediate member is replaced according to the heat generation amount of the driver section and the heat generation amount of the motor main body section, it becomes possible to suppress the temperature rise of the electronic components mounted on the circuit board. The versatility of the integrated motor can be improved.

In the present invention, the heat generation amount of the motor main body and the heat generation amount of the driver section to be compared are, for example, the heat generation amounts when the rotor is driven at the rated output. Further, in the present invention, for example, based on the temperature of the end surface on the intermediate member side of the motor main body portion and the temperature of the end surface on the intermediate member side of the case body, the heat generation amount of the motor main body portion and the heat generation amount of the driver portion. Are compared.

In the present invention, the driver-integrated motor preferably includes a flat plate-like elastic member sandwiched between the motor main body and the intermediate member. If comprised in this way, it will become possible to improve the adhesiveness of a motor main-body part and an elastic member, and to improve the adhesiveness of an intermediate member and an elastic member. Therefore, it becomes possible to improve the waterproofness between the motor body and the intermediate member.

In this invention, a case body is provided with the cylindrical member formed in a substantially cylindrical shape, and the cover member which covers the end surface opposite to the end surface of the intermediate member side of a cylindrical member, and a cover member is an intermediate member of a driver part. It is preferable that a cover portion constituting an end surface opposite to the end surface on the side is provided, a heat radiating plate is disposed inside the cover portion, and the circuit board is fixed to the inner surface of the cover portion. If comprised in this way, it will become possible to raise the relative positional accuracy of a circuit board with respect to the inner surface of a cover part. Therefore, it is possible to reliably contact the heat sink disposed inside the cover portion and the circuit board or the electronic component mounted on the circuit board. As a result, it is possible to efficiently dissipate heat of the electronic component using the heat sink.

In the present invention, for example, the circuit board is fixed to the inner side surface of the cover portion via a support, and the circuit board or the electronic component mounted on the circuit board is in contact with the heat sink.

In the present invention, it is preferable that a heat radiating fin is formed on the outer surface of the cover portion. If comprised in this way, it will become possible to dissipate the heat | fever of an electronic component efficiently using the fin for thermal radiation.

As described above, in the driver-integrated motor of the present invention, the temperature rise caused by the heat generated in the motor main body portion and the temperature rise caused by the heat generated in the driver portion of the electronic component mounted on the circuit board are reduced. It becomes possible to suppress.

It is a perspective view of a driver integrated motor concerning an embodiment of the invention. It is a top view which shows the driver part of the driver integrated motor shown in FIG. 1, an intermediate member, and its peripheral part. It is a perspective view of the intermediate member shown in FIG. It is sectional drawing for demonstrating the structure of the case body concerning other embodiment of this invention.

1 Motor (driver integrated motor)
2 Motor body section 3 Driver section 4 Intermediate member 9a Rear end face (end face of motor body section on the intermediate member side)
13, 14

Circuit board

15, 25 Case body 15a Front end surface (end surface on the intermediate member side of the case body)
16 FET (electronic parts)
17 heat sink 20 elastic member 23 cylinder member 24 cover member 24a cover part 28 support

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Configuration of driver integrated motor)
FIG. 1 is a perspective view of a driver-integrated motor 1 according to an embodiment of the present invention. FIG. 2 is a plan view showing the driver unit 3, the intermediate member 4, and the peripheral portion of the driver integrated motor 1 shown in FIG. FIG. 3 is a perspective view of the intermediate member 4 shown in FIG. In the following description, the axial direction (Z direction in FIG. 1 and the like) of the driver integrated motor 1 is referred to as “axial direction”. Also, the output side (Z1 direction side in FIG. 1 etc.) of the driver integrated motor 1 is the “front” side, and the counter output side (Z2 direction side in FIG. 1 etc.) of the driver integrated motor 1 is “rear (rear)”. ”Side.

The driver integrated motor 1 (hereinafter referred to as “motor 1”) of this embodiment is an industrial servo motor, and its rated output is 50 W to 750 W. The motor 1 includes a motor main body 2 and a driver unit 3. Further, the motor 1 includes an intermediate member 4 disposed between the motor main body 2 and the driver unit 3 and a heat radiating member 5 for heat dissipation fixed to the driver unit 3. In this embodiment, the internal structure and outer shape of the motor body 2 may change depending on the rated output of the motor 1, but the driver unit 3 is used in common regardless of the rated output of the motor 1. Is done.

The motor body 2 includes a rotor and a stator (not shown). One of the rotor or the stator includes a driving magnet, and the other of the rotor or the stator includes a driving coil. The motor body 2 includes a substantially cylindrical case body 8 in which the rotor and the stator are accommodated, a holder 9 fixed to the rear end surface of the case body 8, and a flange 10 fixed to the front end surface of the case body 8. And.

The case body 8, the holder 9, and the flange 10 are made of an aluminum alloy. The holder 9 is formed in a substantially cylindrical shape. Specifically, the holder 9 is formed in a substantially cylindrical shape having a substantially circular inner peripheral surface when viewed from the axial direction of the motor 1 and a substantially square outer peripheral surface. On the inner peripheral side of the holder 9, cables (not shown) that connect

circuit boards

13 and 14, which will be described later, constituting the driver unit 3 and the motor main unit 2 are routed. The flange 10 is formed in a substantially cylindrical shape. Specifically, the flange 10 is formed in a substantially cylindrical shape in which the shape of the inner peripheral surface when viewed from the axial direction is a substantially circular shape and the shape of the outer peripheral surface is a substantially square shape. An output shaft of the motor main body 2 is disposed on the inner peripheral side of the flange 10. The flange 10 is provided to attach the motor 1 to industrial equipment.

The driver unit 3 includes two

circuit boards

13 and 14 on which a drive circuit and the like for driving the rotor are mounted, and a case body 15 in which the

circuit boards

13 and 14 are accommodated. The case body 15 is formed in a substantially rectangular tube shape. The case body 15 is formed of an aluminum alloy. Various electronic components such as a field effect transistor (FET) 16 for supplying a current to the driving coil are mounted on the circuit board 13. Various electronic components such as an integrated circuit (IC, not shown) are mounted on the circuit board 14.

The heat radiation member 5 includes a flat base portion 5a whose front side surface is fixed to the rear end surface of the case body 15, and a plurality of fins 5b formed on the rear side surface of the base portion 5a. A heat radiating plate 17 for heat dissipation is fixed to the front side surface of the base portion 5a. The heat radiating plate 17 is formed of a heat radiating member such as an aluminum alloy. The heat radiating plate 17 is disposed inside the case body 15. The circuit board 13 is fixed to the heat sink 17. In addition, the circuit board 14 is fixed to the heat radiating plate 17 via a support 18 disposed between the circuit board 13 and the circuit board 14.

As shown in FIG. 3, the intermediate member 4 is formed in a substantially rectangular tube shape, and the inner peripheral side of the intermediate member 4 is a through hole through which a cable connecting the motor main body 2 and the

circuit boards

13 and 14 passes. 4a. The intermediate member 4 and the case body 15 are fixed to each other with the rear end surface of the intermediate member 4 and the front end surface 15a of the case body 15 in contact with each other.

A flat elastic member 20 is sandwiched between the intermediate member 4 and the holder 9. The elastic member 20 is formed of an elastic material having elasticity such as rubber. At the center of the elastic member 20, a through hole 20 a (see FIG. 2) for passing a cable connecting the motor main body 2 and the

circuit boards

13 and 14 is formed. The intermediate member 4 and the holder 9 are arranged so that the front end surface of the intermediate member 4 and the elastic member 20 are in close contact, and the rear end surface 9a of the holder 9 and the elastic member 20 are in close contact with each other in the axial direction. In a compressed state, they are fixed to each other.

In the motor 1 configured as described above, when current is supplied to the driving coil and the rotor rotates, the driving coil and the like generate heat, the motor main body 2 generates heat, and the electronic components such as the FET 16 The driver unit 3 generates heat and generates heat.

In this embodiment, when the amount of heat generated by the driver unit 3 is larger than the amount of heat generated by the motor body 2, the intermediate member 4 formed of a member having a thermal conductivity equal to or higher than the thermal conductivity of the case body 15 is used as the motor body. It is arranged between the part 2 and the driver part 3. Specifically, an intermediate member 4 made of an aluminum alloy or a copper alloy is disposed between the motor main body 2 and the driver unit 3. When the intermediate member 4 is formed of an aluminum alloy, the intermediate member 4 can be reduced in weight. Further, when the intermediate member 4 is formed of a copper alloy, the rigidity of the intermediate member 4 can be increased.

On the other hand, when the heat generation amount of the motor main body 2 is larger than the heat generation amount of the driver unit 3, the intermediate member 4 formed of a member having a thermal conductivity lower than that of the case body 15 is used as the motor main body portion. 2 and the driver unit 3. Specifically, an intermediate member 4 formed of resin, rubber, or the like is disposed between the motor main body 2 and the driver unit 3. For example, an intermediate member 4 made of polycarbonate (PC) is disposed between the motor body 2 and the driver unit 3.

Note that the shape of the intermediate member 4 formed of a member having a thermal conductivity equal to or higher than the thermal conductivity of the case body 15 and the intermediate member formed of a member having a thermal conductivity lower than the thermal conductivity of the case body 15 The shape of 4 is the same. Further, when the rated output of the motor 1 is relatively small, the amount of heat generated by the driver unit 3 is larger than the amount of heat generated by the motor body 2, and when the rated output of the motor 1 is relatively large, the motor body. 2 is larger than the amount of heat generated by the driver unit 3.

In this embodiment, the heat generation amount of the motor main body 2 and the heat generation amount of the driver unit 3 to be compared are the heat generation amounts when the rotor is driven at the rated output. That is, the amount of heat generated by the motor body 2 when the rotor is driven at the rated output and the amount of heat generated by the driver unit 3 are compared to determine which amount of heat is larger. Further, based on the temperature of the rear end surface 9 a of the holder 9 and the temperature of the front end surface 15 a of the case body 15, the heat generation amount of the motor body 2 and the heat generation amount of the driver unit 3 are compared. That is, based on the temperature of the end surface on the intermediate member 4 side of the motor main body 2 and the temperature of the end surface on the intermediate member 4 side of the case body 15, the heat generation amount of the motor main body portion 2 and the heat generation amount of the driver portion 3. Are compared. Specifically, if the temperature of the front end surface 15a of the case body 15 is higher than the temperature of the rear end surface 9a of the holder 9, the amount of heat generated by the driver unit 3 becomes larger than the amount of heat generated by the motor body 2, and the rear end surface 9a. Is higher than the temperature of the front end face 15 a, the amount of heat generated by the motor body 2 is greater than the amount of heat generated by the driver unit 3.

The heat generation amount of the motor main body 2 and the heat generation amount of the driver unit 3 to be compared are calculated before the assembly of the motor 1 by calculation or experiment. Further, based on the calculation result of the calorific value, the intermediate member 4 formed of a member having a thermal conductivity equal to or higher than the thermal conductivity of the case body 15 is disposed between the motor main body 2 and the driver unit 3. Or whether the intermediate member 4 formed of a member having a thermal conductivity lower than that of the case body 15 is disposed between the motor main body 2 and the driver unit 3 before the motor 1 is assembled. The determined intermediate member 4 is assembled to the motor 1.

(Main effects of this form)
As described above, in this embodiment, when the heat generation amount of the driver unit 3 is larger than the heat generation amount of the motor main body unit 2, the driver unit 3 is formed of a member having a thermal conductivity equal to or higher than that of the case body 15. When the intermediate member 4 is disposed between the motor main body 2 and the driver unit 3 and the heat generation amount of the motor main body unit 2 is larger than the heat generation amount of the driver unit 3, the heat conductivity of the case body 15 is lower. An intermediate member 4 formed of a member having thermal conductivity is disposed between the motor main body 2 and the driver unit 3. Therefore, in this embodiment, when the amount of heat generated by the driver unit 3 is large, it is possible to efficiently release the heat generated in the driver unit 3 to the motor main body unit 2. It becomes possible to suppress the temperature rise caused by the heat generated in the driver unit 3 of the electronic component to be mounted. Further, in the present embodiment, when the heat generation amount of the motor main body 2 is large, it is possible to suppress the heat generated in the motor main body 2 from being transmitted to the driver unit 3, and as a result, the circuit board. It is possible to suppress the temperature rise caused by the heat generated in the motor main body 2 of the electronic components mounted on 13 and 14.

Further, in this embodiment, if only the intermediate member 4 is replaced according to the heat generation amount of the motor main body 2 and the heat generation amount of the driver unit 3, the temperature rise of the electronic components mounted on the

circuit boards

13 and 14 can be suppressed. Therefore, the versatility of the motor 1 can be improved.

In this embodiment, the elastic member 20 is sandwiched between the intermediate member 4 and the holder 9. The intermediate member 4 and the holder 9 are in close contact with the front end surface of the intermediate member 4 and the elastic member 20. 9, the elastic member 20 is fixed to each other in a state where the elastic member 20 is compressed in the axial direction so that the rear end surface 9a and the elastic member 20 are in close contact with each other. Therefore, in this embodiment, it becomes possible to improve the waterproofness between the motor main body 2 and the intermediate member 4.

In this embodiment, the circuit board 13 is fixed to the heat sink 17. Therefore, the circuit board 13 on which electronic components such as the FET 16 are mounted can be reliably brought into contact with the heat radiating plate 17. Therefore, in this embodiment, it is possible to efficiently dissipate the heat of the electronic component having a large calorific value such as the FET 16 mounted on the circuit board 13 by using the heat radiating plate 17.

(Modification of case body)
FIG. 4 is a cross-sectional view for explaining the configuration of a case body 25 according to another embodiment of the present invention.

In the above-described form, the driver unit 3 includes the case body 15 formed in a substantially rectangular tube shape. In addition to this, for example, as shown in FIG. 4, the driver unit 3 replaces the case body 15 with a cylindrical member 23 formed in a substantially square cylindrical shape, and a cover member 24 that covers the rear end surface of the cylindrical member 23. The case body 25 comprised from may be provided.

The cover member 24 includes a cover portion 24a that constitutes the rear end surface of the driver portion 3. The rear side surface of the heat sink 17 is in contact with the front side surface of the cover portion 24a. The circuit board 13 is fixed to the front side surface of the cover portion 24a. Specifically, the circuit board 13 is fixed to the front side surface of the cover portion 24 a via the support column 28. Further, the circuit board 14 is fixed to the circuit board 13 via a support column 18 disposed between the circuit board 13 and the circuit board 14. The rear side surface of the circuit board 13 is in contact with the front side surface of the heat sink 17.

In the case body 25, since it becomes possible to raise the relative positional accuracy of the circuit board 13 with respect to the front side surface of the cover part 24a, the heat sink 17 arrange | positioned in the front side of the cover part 24a, and electronic components, such as FET16, are mounted. The circuit board 13 can be reliably brought into contact with the circuit board 13. As a result, similarly to the above-described embodiment, it is possible to efficiently dissipate the heat of electronic components having a large heat generation amount such as the FET 16 mounted on the circuit board 13 using the heat radiating plate 17.

In addition, in the example shown in FIG. 4, although the fin for heat radiation is not formed in the rear side surface of the cover part 24a, the fin for heat radiation may be formed in the rear side surface of the cover part 24a. In this case, it becomes possible to more efficiently dissipate the heat of the electronic components having a large calorific value such as the FET 16 mounted on the circuit board 13 by using the fins for heat dissipation. In the example shown in FIG. 4, an electronic component such as FET 16 is mounted on the front side surface of the circuit board 13, and the rear side surface of the circuit board 13 is in contact with the front side surface of the heat sink 17. An electronic component such as FET 16 may be mounted on the rear side surface, and the electronic component may be in contact with the front side surface of the heat sink 17.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

In the embodiment described above, the heat generation amount of the motor main body 2 and the heat generation amount of the driver unit 3 are compared based on the temperature of the rear end surface 9a of the holder 9 and the temperature of the front end surface 15a of the case body 15. In addition to this, the amount of heat generated by the motor body 2 and the amount of heat generated by the driver unit 3 are compared based on, for example, the temperature of the other part of the motor body 2 and the temperature of the other part of the driver unit 3. May be. For example, the amount of heat generated by the motor body 2 and the amount of heat generated by the driver unit 3 are compared based on the temperature in the vicinity of the driving coil of the motor body 2 and the temperature in the vicinity of the FET 16 of the driver unit 3. May be.

In the embodiment described above, the elastic member 20 is sandwiched between the intermediate member 4 and the holder 9, but the elastic member 20 may not be sandwiched between the intermediate member 4 and the holder 9. In the embodiment described above, an elastic member corresponding to the elastic member 20 is not sandwiched between the intermediate member 4 and the case body 15, but an elastic member is sandwiched between the intermediate member 4 and the case body 15. Also good.

In the embodiment described above, the intermediate member 4 is formed of a member having a thermal conductivity equal to or higher than that of the case body 15 and a member having a thermal conductivity lower than that of the case body 15. The shape of the intermediate member 4 is the same. In addition to this, for example, the contact area between the case member 15 and the elastic member 20 formed by a member having a thermal conductivity equal to or higher than that of the case member 15 is greater than the heat conductivity of the case member 15. The intermediate member 4 may be formed so as to be larger than the contact area between the intermediate member 4 formed of a member having a low thermal conductivity, the case body 15 and the elastic member 20. In this case, the outer shape of the intermediate member 4 formed of a member having a thermal conductivity equal to or higher than that of the case body 15 and a member having a thermal conductivity lower than that of the case body 15 are formed. Further, the outer shape of the intermediate member 4 may be the same or different.

Claims

A motor main unit having a rotor and a stator; a driver unit having a circuit board on which a drive circuit for driving the rotor is mounted; and a case body accommodating the circuit board; the motor main unit and the driver An intermediate member disposed between the two parts,
When the heat generation amount of the driver portion is larger than the heat generation amount of the motor main body portion, the intermediate member formed of a member having a thermal conductivity equal to or higher than the heat conductivity of the case body is the motor main body portion and the motor body portion. Placed between the driver and
When the heat generation amount of the motor main body is larger than the heat generation amount of the driver unit, the intermediate member formed of a member having a thermal conductivity lower than the thermal conductivity of the case body is the motor main body portion. A driver-integrated motor, which is disposed between the driver unit and the driver unit.
2. The driver-integrated motor according to claim 1, wherein the heat generation amount of the motor main body and the heat generation amount of the driver section to be compared are heat generation amounts when the rotor is driven at a rated output.
Based on the temperature of the end surface of the motor body portion on the intermediate member side and the temperature of the end surface of the case body on the side of the intermediate member, the heat generation amount of the motor body portion and the heat generation amount of the driver portion are 3. The driver integrated motor according to claim 1, wherein the motor is integrated.
4. The driver-integrated motor according to claim 1, further comprising a flat elastic member sandwiched between the motor main body and the intermediate member. 5.
The case body includes a cylindrical member formed in a substantially cylindrical shape, and a cover member that covers an end surface of the cylindrical member opposite to the end surface on the intermediate member side,
The cover member includes a cover portion that constitutes an end surface of the driver portion opposite to the end surface on the intermediate member side,
Inside the cover part, a heat dissipation plate for heat dissipation is arranged,
5. The driver-integrated motor according to claim 1, wherein the circuit board is fixed to an inner surface of the cover portion.
The circuit board is fixed to the inner surface of the cover part via a support,
6. The driver integrated motor according to claim 5, wherein the circuit board or an electronic component mounted on the circuit board is in contact with the heat radiating plate.
The driver-integrated motor according to claim 5 or 6, wherein a fin for heat radiation is formed on an outer surface of the cover portion.