JP2015204716A - Rotary electric machine integrated control apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine integrated control apparatus which prevents heat from being received from a motor and satisfactorily cools a control unit.SOLUTION: The rotary electric machine integrated control device includes: a motor which includes a rotor, a stator and a cooling fan and in which the cooling fan is rotated together with rotation of the rotor; and the control unit including a power element for power supply to the motor and an electronic control device for controlling drive of the power element. The motor includes a first housing in which the rotor, the stator and the cooling fan are accommodated and which includes an exhaust hole for guiding a stream of a gas that is generated with the rotation of the cooling fan to an external space. The control unit includes a second housing in which at least the electronic control device is accommodated. Further, a first passage connecting an internal space of the first housing and an internal space of the second housing and a second passage connecting the internal space of the second housing and the external space are included.

Description

  The present invention relates to a rotating electrical machine integrated control device in which an electric motor and a control unit for controlling the electric motor are integrally formed.

  In the rotating electric machine integrated control device, in addition to the heat generation of the electric motor accompanying the rotation, the electronic control device, the power element for power conversion, and the like generate heat. For this reason, the rotating electrical machine integrated control device is required to have higher thermal reliability than before.

  Patent Document 1 proposes a configuration in which a gap is provided between a rear bracket corresponding to a case of an electric motor and a control device, and cooling elements are cooled by passing cooling air through the gap. Has been.

JP 2006-33986 A

  However, in the controller-integrated rotating electrical machine disclosed in Patent Document 1, heat radiation from the switching element to the control board cannot be blocked, and the thermal reliability of the control board may be reduced. In addition, since the case for housing the control board and the rear bracket are thermally connected by the conductive stud, heat may be conducted from the electric motor to the control board, and the thermal reliability of the control board may be reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to suppress heat reception from an electric motor and to cool a control unit satisfactorily.

  The invention disclosed herein employs the following technical means to achieve the above object. Note that the reference numerals in parentheses described in the claims and in this section indicate a corresponding relationship with specific means described in the embodiments described later as one aspect, and limit the technical scope of the invention. Not what you want.

  In order to achieve the above object, the present invention includes a rotor (210), a stator (220), and a cooling fan (240), and an electric motor (200) in which the cooling fan rotates with rotation of the rotor, A rotating electrical machine integrated control device comprising: a control unit (300) having a power element (311) for power supply and an electronic control device (320) for controlling driving of the power element, The electric motor has a first casing (250) that houses a rotor, a stator, and a cooling fan, and has an exhaust hole (254) that guides a gas flow generated as the cooling fan rotates to an external space. A second housing (322) that houses at least the electronic control device, and further includes a first passage (700) that connects the internal space of the first housing and the internal space of the second housing; The internal space of the housing A second passage connecting the part space (800) is characterized in that it comprises.

  According to this, with the rotation of the cooling fan, the cooling air is directly introduced into the internal space of the second housing. For this reason, the heat generating element including the electronic control device can be efficiently cooled.

  In addition, since the cooling air passes through the members that connect the first housing that houses the rotor and the stator and the second housing that houses the electronic control unit, that is, the first passage and the second passage, The heat conducted through the first passage and the second passage can be cooled by the cooling air.

It is sectional drawing which shows schematic structure of the rotary electric machine integrated control apparatus which concerns on 1st Embodiment. It is sectional drawing of the electric motor in alignment with the II-II line | wire shown in FIG. It is a circuit diagram which shows the structure of a control part. It is a perspective view which shows the structure of a 1st channel | path. It is a perspective view which shows the structure of a 2nd channel | path.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same reference numerals are given to the same or equivalent parts.

(First embodiment)
Initially, with reference to FIGS. 1-3, schematic structure of the rotary electric machine integrated control apparatus which concerns on this embodiment is demonstrated.

  The rotating electrical machine integrated control apparatus according to the present embodiment is an electromechanical integrated rotating electrical machine integrated control apparatus mounted on a vehicle, for example. As shown in FIG. 1, the rotating electrical machine integrated control device 100 includes an electric motor 200 that is mechanically driven, and a control unit 300 that controls the driving of the electric motor 200.

  The electric motor 200 is a motor constituting a starter, for example, and includes a rotor 210 and a stator 220. A shaft 230 and a cooling fan 240 are fixed to the rotor 210. The shaft 230 rotates with the rotor 210 and transmits power to an engine (not shown). The cooling fan 240 rotates together with the rotor 210 to take cooling air from the external space into the electric motor 200 and discharge the heat generated in the electric motor 200 to the external space.

  As shown in FIG. 2, the rotor 210 is a cylindrical member coaxial with a stator 220 described later, and is disposed on the inner peripheral side of the stator 220. A shaft 230 is inserted and fixed in the cavity 211 including the axis of the rotor 210. The rotor 210 has a rotor coil 212 therein. As shown in FIG. 1, the rotor 210 rotates together with the shaft 230 around the axis L as a rotation axis. Further, the cooling fan 240 is fixed to the rotor 210 on one surface orthogonal to the rotation axis L, and the cooling fan 240 rotates within the surface orthogonal to the rotation axis L as the rotor 210 rotates. The cooling fan 240 takes in air from the external space by rotating. This air flow becomes cooling air and cools the entire electric motor 200.

  As shown in FIG. 2, the stator 220 has a cylindrical stator core 221 and a plurality of salient poles 222 projecting from the inner wall of the stator core 221 toward the inside of the cylinder, and each salient pole 222 has a stator coil 223. Is wrapped around. An alternating current flows through the stator coil 223, and the stator 220 functions as an electromagnet. The magnetic field formed by the stator 220 and the magnetic field formed by the current flowing through the rotor coil 212 interact to generate a moment of rotation in the rotor 210.

  The rotor 210 and the stator 220 are accommodated in a motor case 250 as shown in FIG. An insertion hole 251 for inserting the shaft 230 along the rotation axis L is formed in the motor case 250. A bearing 252 is disposed in the insertion hole 251 so that the shaft 230 does not precess. The motor case 250 corresponds to the first housing described in the claims.

  The control unit 300 is disposed adjacent to the electric motor 200 in the direction along the rotation axis L, and includes a power converter 310 and an electronic control unit 320 as shown in FIG. 1, thereby driving the electric motor 200. To control. The control unit 300 further includes a second housing 322 that houses the electronic control device 320.

  As shown in FIG. 3, the power converter 310 is an inverter that converts a direct current supplied from the direct current power source 400 into an alternating current. The converted electric power is supplied to the electric motor 200 and used for the rotational movement of the rotor 210. The power converter 310 in the present embodiment includes a plurality of power elements 311 and a free-wheeling diode 312 connected to each power element 311 in antiparallel. The power element 311 is a switching element typified by a MOSFET, and repeats an on / off operation at an appropriate timing. As a result, the direct current is converted into an alternating current. The free-wheeling diode 312 is connected to protect the power element 311 from the induced electromotive force generated by the electric motor 200 corresponding to the load. A capacitor 500 shown in FIG. 3 is a smoothing capacitor that is connected in parallel with the power converter 310 and suppresses fluctuations in DC voltage caused by the switching operation of the power element 311.

  Since the power element 311 generates heat due to the on-resistance, cooling is necessary to ensure thermal reliability. The power element 311 is thermally connected to a frame 610 as a bottom portion of a third housing 600 described later via solder (not shown). That is, the heat generated by the power element 311 is conducted to the frame 610. And in the frame 610, the radiation fin 611 is formed in the 1st surface 610a opposite to the surface (2nd surface 610b) to which the power element 311 was connected. Therefore, the heat conducted to the frame 610 is radiated from the radiation fins 611.

  As shown in FIG. 3, the electronic control device 320 is connected to the gate terminal of the power element 311 in the power converter 310, and controls on / off of the power element 311. As shown in FIG. 1, the electronic control device 320 in this embodiment is mounted on a substrate 321. The electronic control device 320 and the substrate 321 are accommodated in the second housing 322 and are protected from an external impact or the like.

  The control unit 300 is covered with an outer cover 620 and is protected from external impacts and the like. The outer cover 620 is fixed to the frame 610 by a general fixing method such as snap-fit or screwing, and the third casing 600 is configured by the frame 610, the heat radiation fins 611, and the outer cover 620. As shown in FIG. 1, in the control unit 300, the electronic control device 320 is housed in the second housing 322, but the power converter 310 is outside the second housing 322 and is in the third housing. It is arranged on the second surface 610 b of the frame 610 constituting the body 600.

  As shown in FIG. 1, the first surface 610 a of the frame 610 faces the motor case 250 as the first housing in the direction along the rotation axis L. The motor case 250 is formed with a suction hole 253 provided in the vicinity of the shaft 230 and an exhaust hole 254 provided on the outer edge of the motor case 250. That is, when the cooling fan 240 rotates, the cooling air passes through the facing region of the first housing 250 and the third housing 600 and takes heat from the power converter 310 by the heat radiating fins 611. The cooling air is sucked into the electric motor 200 from the suction hole 253 and takes heat from the rotor 210 and the stator 220. Thereafter, the cooling air is exhausted from the exhaust hole 254 to the outside.

  The rotating electrical machine integrated control device 100 according to the present embodiment includes a first passage 700 and a second passage 800 in addition to the above configuration. Hereinafter, the configuration of the first passage 700 and the second passage 800 will be described in detail with reference to FIGS. 1, 4, and 5. 4 and 5, the shapes of the screw heads 710 and 810, the screw threads formed on the screw shafts 720 and 820, and the like are illustrated in a simplified manner.

  As shown in FIG. 1, the first passage 700 connects a motor case 250 as a first housing and a second housing 322. The first passage 700 is provided so as to communicate the internal space of the motor case 250 and the internal space of the second housing 322, and air can move between the motor case 250 and the second housing 322. It has become. The first passage 700 in the present embodiment is a hollow bolt as shown in FIG. 4, for example, and includes a screw head 710 and a screw shaft 720. The 1st channel | path 700 has the through-hole 730 which penetrates a hollow volt | bolt along the direction where the screw shaft 720 extends. The first passage 700 penetrates from the internal space of the second housing 322 toward the external space, further penetrates the frame 610 of the third housing 600, and the tip of the screw shaft 720 is screwed into the motor case 250. ing.

  As shown in FIG. 1, the second passage 800 is provided so as to communicate the internal space and the external space of the second housing 322, and air movement between the second housing 322 and the external space is possible. It is possible. The second passage 800 in this embodiment is a hollow bolt as shown in FIG. 5, for example, and includes a screw head 810 and a screw shaft 820. The 2nd channel | path 800 has the 1st through-hole 830a which penetrates a hollow volt | bolt along the direction where the screw shaft 820 extends. Further, the second passage 800 has a second through hole 830b that penetrates from the outer wall of the screw shaft 820 toward the first through hole 830a. The second passage 800 penetrates from the internal space of the second housing 322 toward the external space, further penetrates the frame 610 of the third housing 600, and the tip of the screw shaft 720 is screwed into the motor case 250. ing. In the second through hole 830b, the opening formed in the outer wall of the screw shaft 820 is directed opposite to the position where the shaft 230 is formed, and air in the external space can be easily introduced into the first through hole 830a. .

  In the configuration as described above, the internal space of the motor case 250 becomes negative with respect to the external space as the cooling fan 240 rotates, and the air in the internal space of the second casing 322 connected by the first passage 700 is removed. Exhaust from the exhaust hole 254. As a result, the internal space of the second housing 322 also has a negative pressure relative to the external space. Since the internal space of the second housing 322 is connected to the external space by the second passage 800, the outside air passes through the second housing 322 through the second passage 322, as shown in FIG. The air is exhausted from the exhaust hole 254 of the motor case 250 through the one passage 700.

  Next, the effect of the rotary electric machine integrated control apparatus 100 according to the present embodiment will be described.

  As shown in FIG. 1, the rotary electric machine integrated control device 100 is configured such that the internal space of the motor case 250 communicates with the external space via the first passage 700, the second housing 322, and the second passage 800. Yes. Thus, the cooling air is directly introduced into the internal space of the second housing as the cooling fan rotates. For this reason, the heat generating element including the electronic control unit 320 can be efficiently cooled.

  In addition, the cooling air passes through the members connecting the motor case 250 as the first housing that accommodates the rotor 210 and the stator 220 and the second housing 322, that is, the interiors of the first passage 700 and the second passage 800. Therefore, the heat conducted through the first passage and the second passage from the motor case 250 toward the second housing 322 can be cooled by the cooling air.

  Moreover, the 1st channel | path 700 and the 2nd channel | path 800 are formed through the flame | frame 610 with which the power converter 310 containing the power element 311 which is a heat generating element is arrange | positioned. For this reason, the heat generated in the power converter 310 can be released to the outside by the cooling air flowing inside the first passage 700 and the second passage 800 via the frame 610. That is, heat radiation from the power converter 310 or the frame 610 toward the electronic control device 320 can be suppressed.

  In the above description, the constituent materials of the motor case 250, the second housing 322, the first passage 700, and the second passage 800 are not mentioned. For example, the motor case 250 and the second housing 322 are made of aluminum. The first passage 700 and the second passage 800 may be stainless steel. Since stainless steel has a lower thermal conductivity than aluminum, the amount of heat conducted through the first passage and the second passage from the motor case 250 toward the second housing 322 can be suppressed.

  Moreover, the 1st channel | path 700 and the 2nd channel | path 800 in this embodiment are hollow bolts. Therefore, the first passage 700 and the second passage 800 have a function as a member for fixing the motor case 250 and the second housing 322 to each other in addition to the function as a cooling air passage. Can do.

(Modification)
In the above embodiment, when the second housing 322 can sufficiently block the heat radiation of the power converter 310, it is preferable to have a heat insulating material on the inner wall surfaces of the first passage 700 and the second passage 800.

  As described above, the first passage 700 and the second passage 800 can release the heat generated by the power converter 310 to the outside via the frame 610. However, if the amount of heat is large, the received cooling air can be received. Since it will be introduced into the internal space of the second housing 322, the thermal reliability of the electronic control unit 320 may be reduced. On the other hand, when the second housing 322 can sufficiently block the heat radiation of the power converter 310, the cooling air is generated by providing a heat insulating material on the inner wall surfaces of the first passage 700 and the second passage 800. The amount of heat received from the power converter 310 via the frame 610 can be suppressed. For this reason, the internal space of the second housing 322 can be efficiently cooled.

(Other embodiments)
The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the above-described embodiment, the example in which the motor case 250 and the second housing 322 are made of aluminum and the first passage 700 and the second passage 800 are stainless steel has been described, but the present invention is not limited to this example. For example, the second housing 322 may be made of a resin such as a plastic having a low thermal conductivity for the purpose of blocking radiant heat.

  In the above-described embodiment, the example in which the first passage 700 and the second passage 800 are configured by hollow bolts is shown, but the present invention is not limited to this example. For example, a member that fixes the motor case 250 and the second housing 322 to each other may be used separately from the first passage 700 and the second passage 800 for allowing the cooling air to pass therethrough.

  In the above-described embodiment, the example in which the power converter 310 is disposed outside the second housing 322 has been described. However, the power converter 310 may be disposed in the internal space of the second housing 322.

DESCRIPTION OF SYMBOLS 100 ... Rotating electrical machine integrated control apparatus, 200 ... Electric motor, 250 ... Motor case (1st housing | casing), 300 ... Control part, 322 ... 2nd housing | casing, 700 ... 1st channel | path, 800 ... 2nd channel | path

Claims (5)

An electric motor (200) having a rotor (210), a stator (220), and a cooling fan (240), wherein the cooling fan rotates with the rotation of the rotor;
A rotating electrical machine integrated control comprising: a control unit (300) having a power element (311) for supplying power to the electric motor and an electronic control device (320) for controlling driving of the power element. A device,
The electric motor includes a first housing (250) that houses the rotor, the stator, and the cooling fan, and that has an exhaust hole (254) that guides a gas flow generated as the cooling fan rotates to an external space. And
The control unit includes at least a second housing (322) that houses the electronic control device,
A first passage (700) connecting the internal space of the first housing and the internal space of the second housing;
A rotating electrical machine integrated control device comprising: a second passage (800) connecting the internal space of the second housing and the external space. The first surface (610a) has a bottom portion (610) facing the electric motor, and includes a third housing (600) that houses the control unit,
The third housing has a radiation fin (611) formed integrally with the bottom portion on the first surface,
The power element is disposed on a second surface (610b) which is the back surface opposite to the first surface of the bottom portion, and the first passage and the second passage are formed through the bottom portion. The rotating electrical machine integrated control device according to claim 1.   3. The rotating electrical machine integrated control device according to claim 1, wherein the first passage and the second passage have a smaller thermal conductivity than the first housing and the second housing. 4. .   The rotating electrical machine integrated control device according to any one of claims 1 to 3, wherein the first passage and the second passage have a heat insulating material on an inner wall surface thereof.   The said 1st channel | path and the said 2nd channel | path are comprised by the hollow volt | bolt which fixes the said 1st housing | casing and the said 2nd housing | casing mutually, The any one of Claims 1-4 characterized by the above-mentioned. Rotating electrical machine integrated control device.

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