CN113530825A - Electric compressor - Google Patents

Electric compressor Download PDF

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Publication number
CN113530825A
CN113530825A CN202110389111.6A CN202110389111A CN113530825A CN 113530825 A CN113530825 A CN 113530825A CN 202110389111 A CN202110389111 A CN 202110389111A CN 113530825 A CN113530825 A CN 113530825A
Authority
CN
China
Prior art keywords
switching elements
arm switching
projection
motor
protrusion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110389111.6A
Other languages
Chinese (zh)
Inventor
多田佳史
冈田仁
八代圭司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of CN113530825A publication Critical patent/CN113530825A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/121—Casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/047—Cooling of electronic devices installed inside the pump housing, e.g. inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/003—Constructional details, e.g. physical layout, assembly, wiring or busbar connections
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/14—Mounting supporting structure in casing or on frame or rack
    • H05K7/1422—Printed circuit boards receptacles, e.g. stacked structures, electronic circuit modules or box like frames
    • H05K7/1427—Housings
    • H05K7/1432—Housings specially adapted for power drive units or power converters
    • H05K7/14322—Housings specially adapted for power drive units or power converters wherein the control and power circuits of a power converter are arranged within the same casing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/209—Heat transfer by conduction from internal heat source to heat radiating structure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Inverter Devices (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The housing of the electric compressor has: a motor chamber for accommodating the electric motor; an inverter chamber for accommodating an inverter device; and a partition wall partitioning the motor chamber and the inverter chamber from each other. The plurality of upper arm switching elements and the plurality of lower arm switching elements are arranged in a straight line on the circuit board. The partition wall has a 1 st protrusion and a 2 nd protrusion protruding toward the circuit substrate. The 1 st projection and the 2 nd projection extend along the plurality of upper arm switching elements and the plurality of lower arm switching elements, respectively. The partition wall has a groove portion between the 1 st protrusion and the 2 nd protrusion. The circuit board is disposed in the inverter chamber such that the 1 st projection is thermally coupled to the plurality of upper arm switching elements and the 2 nd projection is thermally coupled to the plurality of lower arm switching elements.

Description

Electric compressor
Technical Field
The present disclosure relates to an electric compressor.
Background
The electric compressor comprises: an electric motor; a motor control device that drives the electric motor; and a housing accommodating the motor control device therein. Further, for example, an electric compressor disclosed in japanese patent application laid-open No. 2019-173656 includes: a high voltage substrate, which is an example of a power substrate on which switching elements are mounted; and a low-voltage board, which is an example of a control board on which a control circuit for controlling the switching operation of the switching element is mounted. The high-voltage substrate is arranged to be capable of exchanging heat with a case as an example of the case.
Disclosure of Invention
Problems to be solved by the invention
As the electric drive of the mounted vehicle progresses, the electric compressor is required to be operated with a larger electric power. As the electric power handled by the electric compressor increases, heat generation of the elements on the power board increases, and stability of operation may be impaired. On the other hand, as the electric drive of the mounted vehicle progresses, further quietness is required of the electric compressor.
An object of the present disclosure is to provide an electric compressor having excellent quietness and operation stability.
Means for solving the problems
An electric compressor according to an aspect of the present disclosure includes: an electric motor that rotates the rotating shaft; a compression unit driven by the rotating shaft to compress a fluid; an inverter device that drives the electric motor and has a circuit board; and a housing. The housing has: a motor chamber that houses the electric motor; an inverter chamber that is disposed in parallel with the motor chamber in an axial direction of the rotating shaft and accommodates the inverter device; and a partition wall partitioning the motor chamber and the inverter chamber from each other. The plurality of upper arm switching elements are arranged in a straight line on the circuit board. The plurality of lower arm switching elements are arranged in a straight line on the circuit board. The partition wall has a 1 st protrusion and a 2 nd protrusion protruding toward the circuit substrate. The 1 st projection extends along the plurality of upper arm switching elements. The 2 nd protrusion extends along the plurality of lower arm switching elements. The partition wall has a groove portion between the 1 st protrusion and the 2 nd protrusion. The circuit board is disposed in the inverter chamber such that the 1 st projection is thermally coupled to the plurality of upper arm switching elements and the 2 nd projection is thermally coupled to the plurality of lower arm switching elements.
Drawings
Fig. 1 is a sectional view showing an electric compressor in the embodiment.
Fig. 2 is a circuit diagram showing an electrical configuration of the motor-driven compressor of fig. 1.
Fig. 3 is a schematic diagram of the power substrate of fig. 2.
Fig. 4A is a partial schematic view of the 1 st side of the power substrate of fig. 3.
Fig. 4B is a schematic sectional view taken along the line 4B-4B in fig. 3 in the direction of the arrows.
Detailed Description
Hereinafter, the electric compressor according to the embodiment will be described with reference to fig. 1 to 4B. The electric compressor of the present embodiment is used in, for example, a vehicle air conditioner.
As shown in fig. 1, a compression unit 12 for compressing a refrigerant as a fluid and an electric motor 13 for driving the compression unit 12 are housed in a casing 11 of the electric compressor 10. The compression portion 12 is, for example, a scroll-type compression portion having an unillustrated fixed scroll fixed to the housing 11 and an unillustrated movable scroll disposed to face the fixed scroll. The compression unit 12 is not limited to the scroll type, and may be, for example, a piston type or a vane type.
The casing 11 has an inlet 11a and an outlet 11 b. In addition, a rotary shaft 14 is accommodated in the housing 11. The rotary shaft 14 is rotatably supported by the housing 11. The compression section 12 is driven by a rotary shaft 14.
The electric motor 13 rotates the rotary shaft 14. The electric motor 13 has: a rotor 13a fixed to the rotary shaft 14 and rotating integrally with the rotary shaft 14; and a stator 13b fixed to an inner circumferential surface of the housing 11 and surrounding the rotor 13 a. A motor coil 15 is wound around the teeth of the stator 13 b. Then, electric power is supplied to the motor coil 15, whereby the rotor 13a and the rotary shaft 14 are rotated.
One end of an external refrigerant circuit 16 is connected to the suction port 11 a. The other end of the external refrigerant circuit 16 is connected to the discharge port 11 b. The refrigerant is sucked into the casing 11 from the external refrigerant circuit 16 through the suction port 11a, and the refrigerant sucked into the casing 11 is compressed by the compression unit 12. The refrigerant compressed by the compression unit 12 is discharged to the external refrigerant circuit 16 through the discharge port 11b, passes through the heat exchanger and the expansion valve of the external refrigerant circuit 16, and returns into the casing 11 through the suction port 11 a. The electric compressor 10 and the external refrigerant circuit 16 constitute a vehicle air-conditioning apparatus 17.
The housing 11 has: a motor chamber 18 for accommodating the electric motor 13; an inverter chamber 20 for housing the inverter device 19; and a partition wall 21 partitioning the motor chamber 18 and the inverter chamber 20 from each other. The inverter chamber 20 is arranged in parallel with the motor chamber 18 in the axial direction of the rotary shaft 14. The compression unit 12, the electric motor 13, and the inverter device 19 are arranged in parallel in the axial direction of the rotary shaft 14 in this order.
The housing 11 includes a cylindrical lid 22 attached to the partition wall 21 and having one end closed. The partition wall 21 and the lid portion 22 form the inverter chamber 20. A connector 23 electrically connected to the inverter device 19 is provided on the partition wall 21 and the lid 22. Dc power is input to the inverter device 19 via the connector 23. A gasket 24 for sealing is disposed between the partition wall 21 and the lid 22.
The partition wall 21 is provided with a conductive member 26 that electrically connects the electric motor 13 and the inverter device 19. The conductive member 26 is supported by the partition wall 21 via a support plate 27. The conductive member 26 penetrates the partition wall 21 and protrudes into the housing 11, specifically, into the motor chamber 18. The conductive member 26 is electrically connected to a motor wiring 13c drawn from the electric motor 13 via a cluster block 28 disposed in the housing 11.
The inverter device 19 includes a power board 30 and a control board 31, and drives the electric motor 13. The power board 30 is an example of a circuit board. The inverter device 19 includes an inverter circuit 32 mounted on the power board 30 and a control circuit 33 mounted on the control board 31. That is, the components of the inverter circuit 32 are mounted on the power board 30, and the components of the control circuit 33 are mounted on the control board 31. The heat Q generated in the power board 30 is transferred to the motor chamber 18 through the partition wall 21, and exchanges heat with the refrigerant.
As shown in fig. 2, the motor coil 15 of the electric motor 13 has a three-phase configuration, i.e., has a U-phase coil 15U, a V-phase coil 15V, and a W-phase coil 15W. In the present embodiment, the U-phase coil 15U, the V-phase coil 15V, and the W-phase coil 15W are Y-connected.
The converter circuit 32 includes a plurality of switching elements 41 to 52 constituting upper and lower arms of each phase. The switching elements 41 to 52 are each formed of a MOS transistor and have a parasitic diode 54 connected in parallel. The plurality of switching elements 41 to 52 perform a switching operation for driving the electric motor 13.
The plurality of switching elements 41 to 52 are mounted on the power board 30 so as to include a plurality of switching elements electrically connected in parallel with each other in each arm of each phase. Specifically, in inverter circuit 32, between positive electrode bus line Lp and negative electrode bus line Ln, switching element 1 for the U-phase upper arm 42 and switching element 1 for the U-phase lower arm 48 are connected in series. The 2 nd switching element 41 is connected in parallel with the 1 st switching element 42. The 2 nd switching element 47 is connected in parallel with respect to the 1 st switching element 48.
Between positive bus line Lp and negative bus line Ln, the 1 st switching element 44 for the upper arm of the V-phase and the 1 st switching element 50 for the lower arm of the V-phase are connected in series. The 2 nd switching element 43 is connected in parallel with the 1 st switching element 44. The 2 nd switching element 49 is connected in parallel with the 1 st switching element 50.
Between positive bus line Lp and negative bus line Ln, the 1 st switching element 46 for the W-phase upper arm and the 1 st switching element 52 for the W-phase lower arm are connected in series. The 2 nd switching element 45 is connected in parallel with respect to the 1 st switching element 46. The 2 nd switching element 51 is connected in parallel with the 1 st switching element 52.
The plurality of switching elements 41 to 52 include 2 nd switching elements 41, 43, 45, 47, 49, and 51 connected in parallel to the 1 st switching elements 42, 44, 46, 48, 50, and 52 constituting the arm, respectively. The 1 st switching element 42 is turned on and off in synchronization with the 2 nd switching element 41. The other 1 st switching elements 44, 46, 48, 50, 52 are also the same as the corresponding 2 nd switching elements 43, 45, 47, 49, 51.
Each gate of the plurality of switching elements 41 to 52 is electrically connected to the control circuit 33. The drains of the switching elements 41 to 46 are electrically connected to the positive electrode of an external power source 56. The sources of the switching elements 47 to 52 are electrically connected to the negative electrode of the external power source 56.
The power substrate 30 incorporates a filter circuit 58 and a snubber circuit 59, and a negative electrode bus line Ln is provided with a shunt resistor 60. The voltage across the shunt resistor 60 is obtained by the control circuit 33 as a value corresponding to the conduction current i and is reflected in the control.
The filter circuit 58 is disposed between the plurality of switching elements 41 to 52 and the external power source 56. The filter circuit 58 has a 1 st capacitor 61 and a coil 62. The coil 62 is a normal mode coil. The snubber circuit 59 has a resistor 63, a diode 64, and a 2 nd capacitor 65. The 1 st capacitor 61 is an electrolytic capacitor, and the 2 nd capacitor 65 is a ceramic capacitor.
The control circuit 33 converts the dc power into the ac power by switching the plurality of switching elements 41 to 52, and supplies the ac power to the electric motor 13. Specifically, the control circuit 33 controls the drive voltage of the electric motor 13 by pulse width modulation. The control circuit 33 generates a PWM signal using a high-frequency triangular wave signal called a carrier signal and a voltage command signal for instructing a voltage. The control circuit 33 controls on/off of each of the plurality of switching elements 41 to 52 using the generated PWM signal. Thereby, the dc voltage supplied from the external power supply 56 is converted into an ac voltage. The converted ac voltage is applied to the electric motor 13 as a drive voltage, thereby controlling the drive of the electric motor 13.
The control circuit 33 controls the PWM signal to variably control the on/off duty ratio of the plurality of switching elements 41 to 52. Thereby, the rotation speed of the electric motor 13 is controlled. The control circuit 33 is electrically connected to the air-conditioning ECU67, and when receiving information on the target rotation speed of the electric motor 13 from the air-conditioning ECU67, rotates the electric motor 13 at the target rotation speed.
As shown in fig. 3, the plurality of switching elements 41 to 52 are arranged in a spaced-apart relationship on the 1 st surface 30a, which is one surface of the power substrate 30, to constitute a 1 st switch group 71 and a 2 nd switch group 72.
The 1 st switch group 71 is composed of a plurality of switch elements 41 to 46 as upper arm switch elements. That is, the 1 st switching group 71 includes the 1 st switching elements 42, 44, 46 and the 2 nd switching elements 41, 43, 45 that constitute the upper arm of each phase.
The 2 nd switch group 72 is composed of a plurality of switch elements 47 to 52 as lower arm switch elements. That is, the 2 nd switch group 72 includes the 1 st switching element 48, 50, 52 and the 2 nd switching element 47, 49, 51 that constitute the lower arm of each phase.
The switching elements 41 to 46 constituting the 1 st switch group 71 are mounted in a line on the 1 st surface 30a of the power substrate 30. The switching elements 47 to 52 constituting the 2 nd switch group 72 are mounted in a line on the 1 st surface 30a of the power substrate 30. Therefore, in the power board 30, the plurality of upper arm switching elements and the plurality of lower arm switching elements are linearly arranged.
On the 2 nd surface 30b of the power substrate 30, a resistor 63, a diode 64, and a 2 nd capacitor 65, which are components of the snubber circuit 59 constituting the inverter circuit 32, are mounted, and a shunt resistor 60 is mounted. The resistor 63, the diode 64, and the 2 nd capacitor 65 are examples of electrical elements constituting the snubber circuit 59. The 2 nd surface 30b is a surface opposite to the 1 st surface 30 a.
The power substrate 30 includes a 1 st heat dissipation portion 74 and a 2 nd heat dissipation portion 75 provided at a portion of the 2 nd surface 30b corresponding to the arrangement region of the plurality of switching elements 41 to 52. The 1 st heat sink 74 corresponds to the 1 st switch group 71, and the 2 nd heat sink 75 corresponds to the 2 nd switch group 72.
A multilayer substrate is used as the power substrate 30. The 1 st heat sink member 74 and the 2 nd heat sink member 75 are formed by opening a resin layer (protective layer) constituting the outermost layer of the 2 nd surface 30b out of the metal layer and the resin layer constituting the power substrate 30. That is, the 1 st heat sink member 74 and the 2 nd heat sink member 75 are portions of the 2 nd surface 30b where the metal layer is exposed.
The resistor 63, the 2 nd capacitor 65, the diode 64, and the shunt resistor 60 are mounted between the 1 st heat sink 74 and the 2 nd heat sink 75. The power substrate 30 has a plurality of through holes 77.
The through holes 77 formed in the 1 st heat dissipating unit 74 thermally connect the plurality of switching elements 41 to 46 constituting the 1 st switch group 71 to the 1 st heat dissipating unit 74, thereby dissipating heat of the plurality of switching elements 41 to 46 to the 1 st heat dissipating unit 74. The through holes 77 formed in the 2 nd heat dissipating unit 75 thermally connect the plurality of switching elements 47 to 52 constituting the 2 nd switching group 72 to the 2 nd heat dissipating unit 75, thereby dissipating heat of the plurality of switching elements 47 to 52 to the 2 nd heat dissipating unit 75.
As shown in fig. 4A and 4B, the partition wall 21 has a 1 st protrusion 79 and a 2 nd protrusion 80 protruding toward the power substrate 30. The 1 st protrusion 79 is in thermal contact with the 1 st heat dissipation part 74 as a heat dissipation path. The 2 nd protrusion 80 thermally contacts the 2 nd heat dissipation part 75 as a heat dissipation path. A groove 81 is formed in the partition wall 21 at a position between the 1 st and 2 nd protrusions 79 and 80. The 1 st projection 79, the 2 nd projection 80, and the groove 81 extend linearly.
The electric compressor 10 includes a soft heat-dissipating member interposed between the 1 st and 2 nd protrusions 79 and 80 and the inverter circuit 32. In the present embodiment, the electric compressor 10 includes the 1 st heat radiation member 83 and the 2 nd heat radiation member 84 as examples of the heat radiation member. The 1 st heat dissipation member 83 is interposed between the 1 st protrusion 79 and the power substrate 30. The 2 nd heat dissipation member 84 is interposed between the 2 nd protrusion 80 and the power substrate 30. The 1 st heat dissipating member 83 and the 2 nd heat dissipating member 84 may be formed in a sheet shape.
The 1 st projection 79 and the 2 nd projection 80 are close to the 2 nd surface 30b of the power substrate 30 at positions corresponding to the arrangement regions of the plurality of switching elements 41 to 52. The 1 st and 2 nd protrusions 79 and 80 protrude from the bottom of the groove 81.
The 1 st projection 79 linearly extends along the 1 st switch group 71 composed of the switch elements 41 to 46. A1 st heat dissipation part 74 is provided on the rear surface of the arrangement region of the switching elements 41 to 46. The 1 st tip surface 79a of the 1 st protrusion 79 is located between the bottom of the groove 81 and the 1 st heat dissipation portion 74, and closer to the 1 st heat dissipation portion 74 than the bottom of the groove 81. The 1 st protrusion 79 is thermally coupled to the plurality of switching elements 41 to 46 via the 1 st heat radiation member 83. In other words, the power substrate 30 is disposed in the inverter chamber 20 such that the 1 st projection 79 is thermally coupled to the switching elements 41 to 46.
The 2 nd projection 80 linearly extends along the 2 nd switch group 72 including the switch elements 47 to 52. A2 nd heat dissipation part 75 is provided on the rear surface of the arrangement region of the switching elements 47 to 52. The 2 nd tip surface 80a of the 2 nd protrusion 80 is located between the bottom of the groove 81 and the 2 nd heat dissipation portion 75, closer to the 2 nd heat dissipation portion 75 than the bottom of the groove 81. The 2 nd protrusion 80 is thermally coupled to the plurality of switching elements 47 to 52 via the 2 nd heat dissipating member 84. In other words, the power substrate 30 is disposed in the inverter chamber 20 such that the 2 nd protrusion 80 is thermally coupled to the switching elements 47 to 52.
The groove 81 is recessed so as to be farther from the power substrate 30 than the 1 st tip surface 79a of the 1 st protrusion 79 and the 2 nd tip surface 80a of the 2 nd protrusion 80. The groove 81 is formed in the partition wall 21 at a position corresponding to a position between the 1 st switch group 71 and the 2 nd switch group 72. The resistor 63, the diode 64, and the 2 nd capacitor 65, which are components of the snubber circuit 59, are housed in the groove 81, and the shunt resistor 60 is housed in the groove 81.
Next, the operation of the present embodiment will be described.
The heat generated from the 1 st switch group 71 is transferred to the 1 st protrusion 79 via the plurality of through holes 77, the 1 st heat dissipation portion 74, and the 1 st heat dissipation member 83, and is dissipated. The heat generated from the 2 nd switch group 72 is transmitted to the 2 nd protrusion 80 via the plurality of through holes 77, the 2 nd heat dissipation portion 75, and the 2 nd heat dissipation member 84, and dissipated.
The effects of the present embodiment will be described.
(1) The electric compressor 10 includes an electric motor 13, a compression unit 12, an inverter device 19, and a casing 11. The electric motor 13 rotates the rotary shaft 14. The compression unit 12 is driven by the rotary shaft 14 to compress fluid. The inverter device 19 drives the electric motor 13 and has a power board 30. The housing 11 has: a motor chamber 18 for accommodating the electric motor 13; an inverter chamber 20 which is disposed in parallel with the motor chamber 18 in the axial direction of the rotary shaft 14 and accommodates the inverter device 19; and a partition wall 21 partitioning the motor chamber 18 and the inverter chamber 20 from each other. The upper arm switching elements 41 to 46 and the lower arm switching elements 47 to 52 are arranged linearly on the power board 30. The partition wall 21 has a 1 st protrusion 79 and a 2 nd protrusion 80 protruding toward the power substrate 30. The 1 st projection 79 extends along the switching elements 41 to 46 of the upper arm. The 2 nd projection 80 extends along the switching elements 47 to 52 of the lower arm. In the partition wall 21, a groove portion 81 is formed between the 1 st protrusion 79 and the 2 nd protrusion 80. The power substrate 30 is disposed in the inverter chamber 20 such that the 1 st projection 79 is thermally coupled to the switching elements 41 to 46 of the upper arm and the 2 nd projection 80 is thermally coupled to the switching elements 47 to 52 of the lower arm. Therefore, the heat generated by the switching elements 41 to 46 of the upper arm and the switching elements 47 to 52 of the lower arm is radiated to the housing 11 and further to the motor chamber 18 into which the refrigerant is introduced via the 1 st projection 79 and the 2 nd projection 80, respectively, and thus the electric compressor 10 is excellent in operation stability. The groove 81 is provided between the 1 st projection 79 and the 2 nd projection 80, and this structure also improves heat dissipation. Since the 1 st projection 79 and the 2 nd projection 80 are provided on the partition wall 21, they function as a plurality of ribs for improving the rigidity of the housing 11, and the quietness of the electric compressor 10 is improved.
(2) The resistor 63, the diode 64, and the 2 nd capacitor 65, which are components of the snubber circuit 59, are housed in the groove 81, and the shunt resistor 60 is housed in the groove 81. Therefore, the resistor 63, the diode 64, the 2 nd capacitor 65, and the shunt resistor 60 can be mounted between the regions where the switching elements 41 to 46 of the upper arms and the switching elements 47 to 52 of the lower arms are mounted, and the size increase of the power board 30 can be suppressed.
(3) Each arm of each phase includes a plurality of switching elements 41 to 52 electrically connected in parallel with each other. Therefore, the number of the switching elements 41 to 52 in each arm is increased compared to the case where each arm of each phase is constituted by 1 switching element, and the 1 st projection 79 and the 2 nd projection 80 are formed longer in accordance with the area where the switching elements 41 to 52 are arranged. As the 1 st projection 79 and the 2 nd projection 80 are formed long, the rigidity of the housing 11 is increased, and the quietness of the electric compressor 10 is further increased.
(4) The heat generated from the 1 st switch group 71 is radiated through the 1 st heat radiation member 83 and the 1 st protrusion 79. The heat generated from the 2 nd switch group 72 is dissipated through the 2 nd heat dissipating member 84 and the 2 nd protrusion 80. Therefore, the temperature variation between the switching elements 41 to 46 of the upper arms and between the switching elements 47 to 52 of the lower arms can be reduced.
(5) The plurality of switching elements 41 to 52 include 2 nd switching elements 41, 43, 45, 47, 49, 51 connected in parallel to the 1 st switching elements 42, 44, 46, 48, 50, 52, respectively. By providing the 2 nd switching elements 41, 43, 45, 47, 49, 51, the current flowing through the 1 st switching elements 42, 44, 46, 48, 50, 52 can be reduced.
This embodiment can be modified as follows. This embodiment and the following modifications can be combined and implemented within a range not technically contradictory to each other.
The power substrate 30 may not include at least one of the 1 st heat sink member 74 and the 2 nd heat sink member 75. The 1 st heat dissipation member 83 and the 2 nd heat dissipation member 84 may be in contact with the resin layer of the power substrate 30.
The electric compressor 10 may not include at least one of the 1 st heat radiation member 83 and the 2 nd heat radiation member 84. For example, grease may be disposed between the 1 st heat dissipation portion 74 and the 1 st protrusion 79 instead of the 1 st heat dissipation member 83, or grease may be disposed between the 2 nd heat dissipation portion 75 and the 2 nd protrusion 80 instead of the 2 nd heat dissipation member 84. The 1 st and 2 nd heat discharging members 83 and 84 may be continuous 1 heat discharging member.
The inverter circuit 32 may not include at least 1 of the 2 nd switching elements 41, 43, 45, 47, 49, and 51.
The groove 81 may be formed to accommodate at least 1 of the resistor 63, the diode 64, and the 2 nd capacitor 65, which are components of the snubber circuit 59, without accommodating the shunt resistor 60, or may be formed to accommodate the shunt resistor 60 without accommodating the snubber circuit 59. That is, at least 1 of the constituent components of the snubber circuit 59 and the shunt resistor 60 may be accommodated in the groove 81.
The 1 st and 2 nd protrusions 79 and 80 may be continuous 1 protrusion. The protrusion may be formed to surround the groove 81.
The 1 st capacitor 61 and the 2 nd capacitor 65 are not limited to electrolytic capacitors, and may be, for example, film capacitors.
In the embodiment, the electric compressor 10 constitutes the vehicle air-conditioning apparatus 17, but is not limited thereto. For example, the electric compressor 10 may be mounted on a fuel cell vehicle, and the air as the fluid supplied to the fuel cell may be compressed by the compression unit 12.

Claims (5)

1. An electric compressor is provided with:
an electric motor that rotates the rotating shaft;
a compression unit driven by the rotating shaft to compress a fluid;
an inverter device that drives the electric motor and has a circuit board; and
the outer shell is provided with a plurality of grooves,
the housing has: a motor chamber that houses the electric motor; an inverter chamber that is disposed in parallel with the motor chamber in an axial direction of the rotating shaft and accommodates the inverter device; and a partition wall partitioning the motor chamber and the inverter chamber from each other,
the electric compressor is characterized in that it is provided with,
a plurality of upper arm switching elements arranged in a straight line on the circuit board,
a plurality of lower arm switching elements arranged in a straight line on the circuit board,
the partition wall has a 1 st protrusion and a 2 nd protrusion protruding toward the circuit substrate,
the 1 st projection extends along the plurality of upper arm switching elements,
the 2 nd protrusion extends along the plurality of lower arm switching elements,
the partition wall has a groove portion between the 1 st protrusion and the 2 nd protrusion,
the circuit board is disposed in the inverter chamber such that the 1 st projection is thermally coupled to the plurality of upper arm switching elements and the 2 nd projection is thermally coupled to the plurality of lower arm switching elements.
2. The motor-driven compressor according to claim 1,
at least one of an electric element constituting a snubber circuit and a shunt resistor is mounted on the circuit board,
at least one of the electrical element and the shunt resistor is housed in the groove.
3. Motor compressor according to claim 1 or 2,
the electric motor has a plurality of phases,
the plurality of upper arm switching elements include a plurality of upper arm switching elements electrically connected in parallel with each other in each of the plurality of phases,
the plurality of lower arm switching elements include a plurality of lower arm switching elements electrically connected in parallel with each other in each of the plurality of phases.
4. The motor-driven compressor according to any one of claims 1 to 3,
a soft heat dissipation member is interposed between each of the 1 st projection and the 2 nd projection and the circuit board.
5. The motor-driven compressor according to any one of claims 1 to 4,
the circuit board has a 1 st surface and a 2 nd surface opposite to the 1 st surface,
the plurality of upper arm switching elements and the plurality of lower arm switching elements are disposed on the 1 st surface of the circuit board,
the partition wall is opposed to the 2 nd surface of the circuit substrate,
the 1 st projection and the 2 nd projection project toward the 2 nd surface of the circuit board.
CN202110389111.6A 2020-04-15 2021-04-12 Electric compressor Pending CN113530825A (en)

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CN117977992A (en) * 2024-03-28 2024-05-03 广州小鹏汽车科技有限公司 Switching circuit, power integration module and vehicle

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