JP2019213432A - Control unit built-in rotary electric machine - Google Patents

Abstract

To provide a control unit built-in rotary electric machine which can inhibit influence of noise on a thermosensor.SOLUTION: A control unit built-in rotary electric machine 1 has: a rotary electric machine 2 which includes a metal housing 20 incorporating a stator and a rotor; and a control unit 3 which drives and controls the rotary electric machine 2. The control unit 3 has: a semiconductor module 4 which incorporates a switching element 41 and a thermosensor 42 for detecting a temperature of the switching element 41; a metal heat radiation member 5 which radiates heat from the semiconductor module 4; and a cover 6 which covers the semiconductor module 4 and the heat radiation member 5. The semiconductor module 4 includes a lead frame 43 which is electrically connected to the switching element 41 and is thermally connected to the heat radiation member 5. The cover 6 holds a conductive member 61 which is disposed facing the heat radiation member 5. The conductive member 61 is electrically connected to the housing 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a controller-integrated rotating electrical machine in which a rotating electrical machine and a control device are integrated.

  As a control device that controls a rotating electrical machine, there is a control device that includes a semiconductor module with a built-in switching element, as disclosed in Patent Document 1. In such a control device, the semiconductor module is disposed in contact with the heat dissipation substrate in order to radiate the heat from the semiconductor module.

JP 2007-1110025 A

  However, in the configuration in which the temperature sensing element that detects the temperature of the switching element is built in the semiconductor module, there is a problem that electromagnetic noise from the outside may affect the temperature sensing element. That is, there is a concern that noise current flows through the temperature sensitive element due to the influence of electromagnetic noise from the outside and affects the output of the temperature sensitive element.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a controller-integrated dynamoelectric machine that can suppress the influence of noise on the temperature sensitive element.

One aspect of the present invention includes a rotating electrical machine (2) including a metal housing (20) including a stator (22) and a rotor (23).
A control device (3) for driving and controlling the rotating electrical machine,
The control device includes a semiconductor module (4) including a switching element (41) and a temperature sensitive element (42) for detecting the temperature of the switching element;
A metal heat dissipating member (5) for dissipating heat from the semiconductor module;
A cover (6) that covers the semiconductor module and the heat dissipation member;
The semiconductor module includes a lead frame (43) electrically connected to the switching element and thermally connected to the heat dissipation member,
The cover holds the conductive member (61) disposed to face the heat dissipation member,
The conductive member is in the controller-integrated dynamoelectric machine (1) electrically connected to the housing.

  In the controller-integrated rotating electrical machine, the conductive member is electrically connected to the housing. Thus, even if a noise current flows through the lead frame due to electromagnetic noise from the outside, at least a part of the noise current can be released to the housing via the conductive member. As a result, it is possible to suppress a noise current from flowing through the temperature sensitive element. That is, the influence of noise on the temperature sensitive element can be suppressed.

As mentioned above, according to the said aspect, the control apparatus integrated rotary electric machine which can suppress the influence of the noise to a temperature sensing element can be provided.
In addition, the code | symbol in the parenthesis described in the means to solve a claim and a subject shows the correspondence with the specific means as described in embodiment mentioned later, and limits the technical scope of this invention. It is not a thing.

FIG. 3 is an explanatory side view of the controller-integrated rotating electrical machine according to the first embodiment. FIG. 2 is an explanatory plan view of a controller-integrated dynamoelectric machine corresponding to the view taken along line II in FIG. FIG. 3 is a cross-sectional explanatory diagram of a part of the controller-integrated dynamoelectric machine corresponding to the cross section taken along line III-III in FIG. 2. FIG. 6 is an equivalent circuit diagram showing a current path of noise current when the conductive member is not electrically connected to the housing. FIG. 3 is an equivalent circuit diagram illustrating a current path of a noise current in the first embodiment. Sectional explanatory drawing of the control apparatus integrated rotary electric machine in Embodiment 2. FIG. Sectional explanatory drawing of the control apparatus integrated rotary electric machine in Embodiment 3. FIG. Sectional explanatory drawing of the control apparatus integrated rotating electrical machine in the fourth embodiment. FIG. 10 is an explanatory plan view of a controller-integrated rotating electrical machine according to a fifth embodiment. FIG. 10 is a cross-sectional explanatory diagram of a part of the controller-integrated dynamoelectric machine corresponding to the cross section taken along line XX in FIG. 9. FIG. 10 is a cross-sectional explanatory diagram of a part of the controller-integrated dynamoelectric machine corresponding to the cross section taken along line XI-XI in FIG. 9.

(Embodiment 1)
An embodiment according to a controller-integrated rotating electrical machine will be described with reference to FIGS.
As shown in FIG. 1, the controller-integrated rotating electrical machine of this embodiment includes a rotating electrical machine 2 and a control device 3. The rotating electrical machine 2 includes a metal housing 20 in which a stator 22 and a rotor 23 are built. The control device 3 drives and controls the rotating electrical machine 2.

As shown in FIGS. 2 and 3, the control device 3 includes a semiconductor module 4, a heat radiating member 5, and a cover 6. The semiconductor module 4 includes a switching element 41 and a temperature sensitive element 42. The temperature sensing element 42 is an element that detects the temperature of the switching element 41.
The heat radiating member 5 is a metal member that radiates heat from the semiconductor module 4. The cover 6 is a member that covers the semiconductor module 4 and the heat dissipation member 5.

As shown in FIG. 3, the semiconductor module 4 includes a lead frame 43. The lead frame 43 is electrically connected to the switching element 41 and thermally connected to the heat dissipation member 5.
The cover 6 holds a conductive member 61. The conductive member 61 is disposed to face the heat radiating member 5.
The conductive member 61 is electrically connected to the housing 20.

  The controller-integrated rotating electrical machine 1 of this embodiment can be a rotating electrical machine for a vehicle mounted on a vehicle. In this case, the rotating electrical machine 2 has, for example, a function as a generator (that is, an alternator) that is driven by a vehicle engine and generates power, and a function as an electric motor that starts the engine (that is, a starter motor). . Such a rotating electrical machine 2 is also referred to as ISG (abbreviation of Integrated Starter Generator). The rotating electrical machine 2 has a stator 22 and a rotor 23 as shown in FIG. The rotating electrical machine 2 has a shaft 24 integrated with the rotor 23. The stator 22, the rotor 23, and the shaft 24 are accommodated in a metal housing 20.

  The stator 22 has a stator core and a three-phase stator coil. The stator 22 generates a rotating magnetic field that rotates the rotor 23 by supplying an alternating current having a phase shift to the three-phase stator coil. The shaft 24 is formed integrally with the rotor 23 and rotates together with the rotor 23.

  As shown in FIG. 1, the control device 3 is fixed to one end of the rotating electrical machine 2 in the axial direction of the shaft 24. In this way, the controller-integrated rotating electrical machine 1 is formed by integrating the rotating electrical machine 2 and the control device 3. Hereinafter, the axial direction of the shaft 24 is also simply referred to as “axial direction”. That is, the arrangement direction in which the rotating electrical machine 2 and the control device 3 are aligned matches the axial direction. In addition, the side on which the control device 3 is disposed with respect to the rotating electrical machine 2 is referred to as the rear, and the opposite side is referred to as the front. In FIG. 1 and the like, the axial direction is indicated by an arrow X, the front is indicated by Xf, and the rear is indicated by Xr.

As shown in FIG. 3, the control device 3 has components of the control device 3 including the semiconductor module 4 mounted on a base frame 30 made of an insulator such as resin.
The control device 3 controls the electric power supplied from the battery to the rotating electrical machine 2 in order to cause the rotating electrical machine 2 to generate a driving force. Further, in order to charge the battery, the electric power generated by the rotating electrical machine 2 is converted and supplied to the battery. The control device 3 has an inverter circuit that performs power conversion between DC power and three-phase AC power. The semiconductor module 4 constitutes an inverter circuit.

  Each semiconductor module 4 has a switching element 41. As the switching element 41, for example, a MOSFET (that is, a metal oxide field effect transistor) or an IGBT (that is, an insulated gate bipolar transistor) can be used. Further, the semiconductor module 4 has a temperature sensitive element 42. As the temperature sensing element 42, for example, a temperature sensing diode can be used. A temperature-sensitive diode is an element that outputs a voltage according to temperature by passing a constant current. More specifically, the temperature-sensitive diode is an element whose voltage decreases as the temperature increases.

  The semiconductor module 4 includes a lead frame 43 that is electrically connected to the switching element 41. A part of the lead frame 43 protrudes and serves as a terminal for electrical connection with other electronic components. The lead frame 43 is molded by a molding resin 44 together with the switching element 41 and the temperature sensitive element 42 and integrated. A part of the lead frame 43 is also exposed in the thickness direction of the semiconductor module 4 to form a heat radiating surface 431. The heat radiating member 5 is thermally connected to the heat radiating surface 431 through the adhesive 11.

  The heat radiating member 5 is arranged on the semiconductor module 4 on the side opposite to the rotating electrical machine 2. At least a part of the conductive member 61 is disposed on the heat dissipation member 5 on the side opposite to the semiconductor module 4.

That is, as shown in FIG. 3, in the axial direction X, the rotating electrical machine 2, the semiconductor module 4, the heat radiating member 5, and the conductive member 61 are arranged in this order from the front side Xf to the rear side Xr.
The heat radiating member 5 includes a heat radiating substrate portion 51 and a plurality of fins 52. The heat dissipation board part 51 is in close contact with the heat dissipation surface 431 of the semiconductor module 4 via the adhesive 11. The fins 52 protrude from the heat dissipation substrate portion 51 in the normal direction of the heat dissipation substrate portion 51.

  The fins 52 protrude from the heat dissipation substrate portion 51 toward the rear Xr in the axial direction X. That is, the fin 52 protrudes toward the conductive member 61. However, the fin 52 is not in contact with the conductive member 61. That is, there is a gap between the heat radiating member 5 and the conductive member 61, and both are electrically insulated from each other.

  The heat dissipating member 5 and the conductive member 61 are arranged close to each other so that a sufficiently large electric capacity component is formed between them. The interval between the heat dissipation member 5 and the conductive member 61 is, for example, equal to or less than the interval between adjacent fins 52 of the heat dissipation member 5.

  In this embodiment, as shown in FIG. 2, the three heat radiating members 5 are arranged side by side in the circumferential direction. That is, the control device 3 arranges the three semiconductor modules 4 side by side in the circumferential direction, and the heat radiating member 5 is arranged corresponding to each semiconductor module 4. The positional relationship with respect to the conductive member 61 in the axial direction X is substantially the same in the three heat radiating members 5.

  As shown in FIGS. 1 and 2, the conductive member 61 is fixed to the cover 6 so as to overlap the three heat radiating members 5 in the axial direction X. The cover 6 is made of resin. As shown in FIG. 3, the cover 6 includes a bottom wall portion 62 that is orthogonal to the axial direction X, and a side wall portion 63 that is erected forward from the outer peripheral edge of the bottom wall portion 62 in the axial direction X. The conductive member 61 is fixed to the inner side surface of the bottom wall portion 62, that is, the front Xf side surface of the bottom wall portion 62.

  In this embodiment, the conductive member 61 is an iron plate and a magnetic member. Moreover, as shown in FIG. 2, the bottom wall part 62 has a substantially circular shape. The conductive member 61 is formed over substantially the entire bottom wall portion 62 and has a substantially circular shape.

  In this embodiment, as shown in FIG. 3, the conductive member 61 is electrically connected to the housing 20 via a metal bolt 12. That is, the bolt 12 erected in the axial direction X passes through a part of the cover 6 and is screwed into the female screw portion of the housing 20. Here, the head 121 of the bolt 12 is electrically connected to the conductive member 61 fixed to the cover 6. Further, the leg portion 122 of the bolt 12 is screwed into the housing 20 and electrically connected thereto. Thereby, the conductive member 61 and the housing 20 are electrically connected. The housing 20 is grounded by being fixed to a vehicle body or the like. Further, the bolt 12 passes through the base frame 30 of the control device 3 in the axial direction X.

Next, the effect of this embodiment is demonstrated.
In the controller-integrated rotating electrical machine 1, the conductive member 61 is electrically connected to the housing 20. Thus, even if a noise current flows through the lead frame 43 due to electromagnetic noise from the outside, at least a part of the noise current can be released to the housing 20 via the conductive member 61. As a result, it is possible to suppress a noise current from flowing through the temperature sensitive element 42. That is, the influence of noise on the temperature sensitive element 42 can be suppressed.

  That is, assuming that the conductive member 61 is not electrically connected to the housing 20 as shown in an equivalent circuit in FIG. 4, the noise current In passes through the lead frame 43, the parasitic capacitance C <b> 4 in the semiconductor module 4, and the like. Therefore, it propagates to the temperature sensitive element 42. In FIGS. 4 and 5, the symbol N indicates a noise current source.

  On the other hand, when the conductive member 61 is electrically connected to the housing 20 as in the controller-integrated rotating electrical machine 1 of this embodiment, a part of the noise current In is obtained as in the equivalent circuit of FIG. In1 passes through the capacitive component C2 between the lead frame 43 and the heat dissipation member 5 and the capacitive component C1 between the heat dissipation member 5 and the conductive member 61. That is, by connecting the conductive member 61 opposed to the heat radiating member 5 to the housing 20 and reducing the impedance of the current path passing through the heat radiating member 5 and the conductive member 61, the noise current to this current path is reduced. The inflow of In1 can be increased. As a result, the noise current In2 flowing to the temperature sensitive element 42 can be reduced.

  In addition, the heat radiating member 5 is disposed on the opposite side of the semiconductor module 4 from the rotating electrical machine 2. At least a part of the conductive member 61 is disposed on the heat radiating member 5 on the side opposite to the semiconductor module 4. Thereby, it is easy to radiate the heat of the semiconductor module 4 through the heat radiating member 5. And it is easy to arrange the conductive member 61 facing the heat radiating member 5. As a result, the impedance of the current path passing through the heat dissipation member 5 and the conductive member 61 can be easily reduced.

  As described above, according to the present embodiment, it is possible to provide a controller-integrated rotating electrical machine that can suppress the influence of noise on the temperature sensitive element.

(Embodiment 2)
As shown in FIG. 6, this embodiment is a form of the controller-integrated rotating electrical machine 1 in which a dielectric 13 having a dielectric constant higher than that of air is disposed between the conductive member 61 and the heat radiating member 5. .
That is, the dielectric 13 is disposed on the front side surface of the conductive member 61 made of an iron plate. The dielectric 13 may be formed, for example, by forming a dielectric film, or may be formed by disposing a dielectric plate.

Examples of the dielectric 13 include ceramic.
Other configurations are the same as those of the first embodiment.
Of the reference numerals used in the second and subsequent embodiments, the same reference numerals as those used in the above-described embodiments represent the same components as those in the above-described embodiments unless otherwise indicated.

In the present embodiment, the dielectric 13 is interposed between the conductive member 61 and the heat radiating member 5. Therefore, the capacitance of the capacitive component formed between the conductive member 61 and the heat radiating member 5 can be increased. As a result, the impedance of the current path passing through this capacitive component can be reduced. As a result, the noise current can easily escape to the housing 20 via the heat dissipation member 5 and the conductive member 61. Therefore, the superimposition of noise on the temperature sensitive element 42 can be suppressed.
In addition, the same effects as those of the first embodiment are obtained.

(Embodiment 3)
As shown in FIG. 7, this embodiment is a configuration of the controller-integrated dynamoelectric machine 1 in which the conductive member 61 and the heat radiating member 5 are electrically connected to each other.
That is, in the first embodiment (see FIG. 3), a gap is provided between the conductive member 61 and the heat dissipating member 5, and the two are not conducting. However, in this embodiment, as shown in FIG. 61 and the heat dissipation member 5 are electrically connected to each other. Specifically, the fins 52 of the heat dissipation member 5 are in contact with the conductive member 61.
Other configurations are the same as those of the first embodiment.

In this embodiment, the impedance of the current path passing through the capacitive component between the lead frame 43 and the conductive member 61 can be further reduced. That is, the impedance between the heat radiating member 5 and the conductive member 61 is substantially zero, and the impedance of the current path from the lead frame 43 to the housing 20 is close to the impedance between the lead frame 43 and the heat radiating member 5 and is small. Become. As a result, the noise current can easily escape to the housing 20 via the heat dissipation member 5 and the conductive member 61. Therefore, the superimposition of noise on the temperature sensitive element 42 can be further suppressed.
In addition, the same effects as those of the first embodiment are obtained.

(Embodiment 4)
As shown in FIG. 8, the present embodiment is a form of the controller-integrated dynamoelectric machine 1 in which the conductive member 61 has a conductive protrusion 611 that protrudes toward the heat dissipation member 5.
The conductive protrusion 611 and the heat dissipation member 5 are electrically connected to each other. Thereby, the conductive member 61 and the heat dissipation member 5 are electrically connected to each other.

The conductive protrusion 611 can be formed, for example, by bending a part of the conductive member 61 made of an iron plate.
In this embodiment, the conductive protrusion 611 is erected in the axial direction X. The conductive protrusion 611 is in contact with a part of the side surface of the fin 52 of the heat dissipation member 5.
Other configurations are the same as those of the third embodiment.

Also in this embodiment, as in the third embodiment, the impedance of the current path from the lead frame 43 to the housing 20 can be reduced.
In addition, since the conductive member 61 and the heat dissipation member 5 are electrically connected via the conductive protrusion 611, the degree of freedom in design can be improved. For example, the conductive member 61 and the heat dissipation member 5 can be electrically connected while maintaining the positional relationship in the axial direction X between the cover 6 and the heat dissipation member 5 at a predetermined distance. Therefore, the dimensional tolerance of each part can be relatively relaxed, and the controller-integrated dynamoelectric machine 1 that can be easily manufactured can be obtained.
In addition, the same effects as those of the third embodiment are obtained.

(Embodiment 5)
In the present embodiment, as shown in FIGS. 9 to 11, at least a part of the conductive member 61 is disposed opposite to the heat radiating member 5 in a direction orthogonal to the direction in which the rotating electrical machine 2 and the control device 3 are arranged. It is a form of the apparatus-integrated rotating electrical machine 1.

  In the present embodiment, a part of the conductive member 61 is a radial facing portion 613 that faces the heat radiating member 5 from the radial direction. Similarly to the first aspect, another part of the conductive member 61 is an axially facing portion 612 that faces the heat radiating member 5 from the axial direction.

  The axially facing portion 612 is fixed to the front side surface of the bottom wall portion 62 of the cover 6. The radial facing portion 613 is fixed to the inner peripheral side surface of the side wall portion 63 of the cover 6. Both the axial facing portion 612 and the radial facing portion 613 are electrically connected to the housing 20 of the rotating electrical machine 2.

In the present embodiment, as shown in FIG. 9, the radial facing portion 613 is continuously formed over the entire circumference of the cover 6. However, the formation region of the radial facing portion 613 may be formed only in a part of the circumferential direction such as a portion close to the heat radiating member 5.
Other configurations are the same as those of the first embodiment.

  In this embodiment, since the conductive member 61 is disposed opposite to the heat radiating member 5 from the radial direction, the impedance of the current path from the heat radiating member 5 to the radially outer side can be reduced.

In particular, in this embodiment, since the conductive member 61 is opposed to the heat radiating member 5 in both the axial direction and the radial direction, it is possible to increase a current path through which a noise current flows, and to the temperature sensitive element 42. It is easier to reduce noise superposition.
In addition, the same effects as those of the first embodiment are obtained.

In the said embodiment, although the form which fixed the electrically conductive member 61 to the inner surface of the cover 6 was shown, arrangement | positioning of the electrically conductive member 61 is not restricted to this. For example, the conductive member may be embedded in the cover, or the cover itself may be the conductive member.
In addition, the electrical connection between the conductive member and the housing is not limited to conduction by a bolt, and may be conduction through, for example, a conductive wire.

  The present invention is not limited to the above embodiments, and can be applied to various embodiments without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Controller-integrated rotating electrical machine 2 Rotating electrical machine 20 Housing 3 Controller 4 Semiconductor module 41 Switching element 42 Temperature sensing element 43 Lead frame 5 Heat radiation member 6 Cover 61 Conductive member

Claims (6)

A rotating electrical machine (2) comprising a metal housing (20) containing a stator (22) and a rotor (23);
A control device (3) for driving and controlling the rotating electrical machine,
The control device includes a semiconductor module (4) including a switching element (41) and a temperature sensitive element (42) for detecting the temperature of the switching element;
A metal heat dissipating member (5) for dissipating heat from the semiconductor module;
A cover (6) that covers the semiconductor module and the heat dissipation member;
The semiconductor module includes a lead frame (43) electrically connected to the switching element and thermally connected to the heat dissipation member,
The cover holds the conductive member (61) disposed to face the heat dissipation member,
The control device-integrated dynamoelectric machine (1), wherein the conductive member is electrically connected to the housing.   The controller-integrated dynamoelectric machine according to claim 1, wherein a dielectric (13) having a dielectric constant higher than that of air is disposed between the conductive member and the heat dissipation member.   The control device-integrated dynamoelectric machine according to claim 1, wherein the conductive member and the heat dissipation member are electrically connected to each other.   The control according to claim 3, wherein the conductive member has a conductive protrusion (611) protruding toward the heat dissipation member, and the conductive protrusion and the heat dissipation member are electrically connected to each other. Equipment-integrated rotating electrical machine.   The heat dissipating member is disposed on the opposite side of the rotating electrical machine in the semiconductor module, and at least a part of the conductive member is disposed on the opposite side of the heat dissipating member from the semiconductor module. 5. The controller-integrated rotating electrical machine according to claim 4.   At least one part (613) of the said electrically-conductive member is arrange | positioned facing the said heat radiating member in the direction orthogonal to the row direction of the said rotary electric machine and the said control apparatus. The controller-integrated rotating electrical machine described.

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