JP3309684B2 - Motor drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor driving device.

[0002]

2. Description of the Related Art Conventionally, for example, in a motor driving device mounted on an electric vehicle, a motor is controlled by a CPU, and a torque command, a resolver signal, and the like are input to the CPU, and these signals are transmitted. Is output from the CPU.
Then, the current command signal is input to a current comparison circuit,
In the current comparison circuit, a current command signal and a motor current signal fed back from the motor are compared to determine a deviation.

The deviation obtained by the current comparison circuit is output to a PWM signal generation circuit. The PWM signal generation circuit compares the input deviation with a reference triangular wave. Is generated, and the switching pulse is output to the gate circuit as a PWM signal. The gate circuit outputs the input PWM signal to the inverter, and the inverter switches a DC current from the battery to generate a three-phase (U-phase, V-phase, and W-phase) AC current. . The motor is driven by supplying the alternating current generated in this manner.

However, in the motor driving device, since the motor and the inverter are formed separately from each other and are connected by a lead wire, electromagnetic noise is generated from the lead wire. In view of this, there has been provided a motor drive device in which an inverter is integrally provided directly above a motor (see Japanese Patent Application Laid-Open No. 6-30547). In the motor driving device, a heat sink is formed at a lower portion of an inverter case that houses the inverter, and both side walls of the heat sink are fixed to side surfaces of the motor. In addition, a connector is attached to a lead wire on the motor side, and a socket is attached to a board on the inverter side, and the motor and the inverter are connected by connecting the connector and the socket.

In this case, since the length of the lead wire can be shortened, generation of electromagnetic noise can be suppressed.

[0006]

However, in the above-mentioned conventional motor driving device, since the connecting portion between the connector and the socket is provided in the inverter case,
When dividing the motor and the inverter for maintenance and management, it is necessary to remove the inverter case from the motor and separate the connector and the socket. Therefore, workability in maintenance / management and the like is reduced.

Further, although the lead wire is expensive, the lead wire can be extended to the substrate on the inverter side, so that the cost of the motor driving device increases. The present invention solves the problems of the conventional motor drive device,
An object of the present invention is to provide a motor drive device that can improve workability in maintenance and management and can reduce cost.

[0008]

For this purpose, in the motor driving apparatus of the present invention, a motor, a cylindrical portion, and a motor housing chamber for housing the motor are formed by closing one end of the cylindrical portion. A motor case with a lid,
A plurality of transistors, each of which is turned on
An inverter for generating a phase current by turning off the inverter, supplying the phase current to the motor, and an inverter accommodating chamber which is detachably fixed directly above the motor case and accommodates the inverter; An inverter case provided with partition means for partitioning the storage chamber and the inverter storage chamber, and extending through the partition means, one end of which is connected to the inverter and the other end of which is connected to the motor; And a connecting member that is electrically connected. One of the motor case and the inverter case has an opening at a position corresponding to a connection between the other end of the connecting member and the motor. In addition, a cover is detachably provided in the opening.

In another motor driving device of the present invention,
Further, one of the motor case and the inverter case has an intermediate case. The opening is formed in the intermediate case.

[0010] In still another motor driving device of the present invention, the connecting member further includes a metal rod-shaped adapter and an insulating member disposed between the adapter and the partitioning means. In still another motor driving device according to the present invention, a first motor driving device is further provided between the partitioning means and the insulating member.
A second sealing member is provided between the insulating member and the adapter.
Are provided respectively.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a main part of a motor driving device according to an embodiment of the present invention.
FIG. 3 is a first cross-sectional view of a motor drive device according to an embodiment of the present invention, FIG. 3 is a second cross-sectional view of the motor drive device according to the embodiment of the present invention, and FIG. 5 is an exploded side view of the connecting member according to the embodiment of the present invention, FIG. 6 is a plan view showing an attached state of the connecting member according to the embodiment of the present invention, and FIG. 7 is an embodiment of the present invention. It is a front view showing the attachment state of the connecting member in a form.

In the figure, 11 is a motor assembly,
Reference numeral 12 denotes an inverter assembly disposed immediately above the motor assembly 11. In the motor assembly 11, a motor 15 is housed in a motor case 14, and in the inverter assembly 12, an inverter 13 and a capacitor 10 are stored in an inverter case 16.
2. The control board 103 is accommodated.

The motor case 14 has a substantially cylindrical portion 14a having a bottom, and one end of the cylindrical portion 14a is closed.
It comprises a lid portion 14b which forms a closed motor housing 18. On the other hand, the inverter case 16 is snapped onto a base 16a disposed in the center, an intermediate case 16b disposed between the base 16a and the cylindrical portion 14a, a bracket 16c, and the base 16a. And an inverter cover 16d forming an inverter accommodating chamber 19, and the intermediate case 16b and the bracket 16c are fixed to the cylindrical portion 14a by bolts b1.
Then, it is detachably fixed to the base 16a by bolts b2.

A partition means is constituted by the base 16a and the top wall 71 of the intermediate case 16b.
9 are defined. An accommodation chamber 68 is formed in the intermediate case 16b, and an opening 75 formed on the lower surface of the intermediate case 16b and an opening formed on the upper surface of the cylindrical portion 14a in correspondence with the opening 75. 115 allows the housing chamber 68 and the motor housing chamber 18 to communicate with each other.

In the present embodiment, the intermediate case 16b and the bracket 16c are separately provided on the front side and the rear side of the motor case 14, respectively. It can also be arranged. Further, the inverter accommodating chamber 19 is sealed by the base 16a and the inverter cover 16d. The base 16a and the bracket 16c
Is formed with a breather 101 for eliminating a pressure difference between the inside and outside of the inverter cover 16d, so that air can freely move through the breather 101.

A plurality of fins 24 are formed on the outer peripheral surface of the cylindrical portion 14a, and each of the fins 24 emits heat generated by the motor 15. On the other hand, a plurality of fins 26 are formed downward on the lower surface of the base 16a, and the fins 26 emit heat generated by the inverter 13. And the cylindrical portion 1
A hole is formed in the center of the bottom of 4a and the center of lid portion 14b, and a motor shaft 27 is provided through the hole, and is rotatably supported by bearings 29 and 30. Further, a convex portion is formed adjacent to the hole at the center of the lid portion 14b, and the convex portion is closed by the lid member 33 to become the sensor chamber.

A resolver 35 is provided in the sensor chamber 34.
The resolver 35 detects the magnetic pole position of the motor 15 based on the rotation of the motor shaft 27 that penetrates the hole and projects into the sensor chamber 34. The motor 15
The rotor 37 is attached to substantially the center of the motor shaft 27 in the axial direction, and is rotated together with the motor shaft 27. The stator 38 is fixed to the inner peripheral surface of the cylindrical portion of the cylindrical portion 14a so as to face the rotor 37. , And three-phase (U-phase, V-phase, and W-phase) alternating currents generated in the inverter 13 are supplied to the U
And windings 39 for each of the V, V and W phases.

Therefore, by supplying a three-phase alternating current to each winding 39, the rotor 37 and the motor shaft 27 can be rotated.
The rotor 37 is fitted to the motor shaft 27 in a state where a plurality of steel plates are stacked. On the outer periphery of the rotor 37, permanent magnets 105 are disposed at a plurality of positions in the circumferential direction. The permanent magnet 105 is fixed while being held down by stoppers 106 and 107 provided at both ends.

Further, at the bottom of the cylindrical portion 14a,
The rear case 81 is attached by bolts b5.
The rear case 81 has a concave portion, and by fixing a rear cover 82 to the rear case 81, a torque transmission chamber 83 is formed.
Is formed. A counter shaft 84 is rotatably supported in the torque transmission chamber 83 via bearings 85 and 86 in parallel with the motor shaft 27.

A counter drive gear 87 is fixed to the motor shaft 27, and a counter driven gear 88 and a parking gear 126 are fixed to the counter shaft 84. The counter drive gear 87 and the counter driven gear 88 are meshed (engaged). An output gear 89 is provided on the counter shaft 84, and the output gear 8
9 is transmitted to the differential device 90.

The differential device 90 is provided with a ring gear 91 on the outer periphery, and a differential case 92 rotatably supported via bearings 79 and 80.
It comprises a pinion shaft 93 fixed to the differential case 92, a pinion 94 rotatably supported by the pinion shaft 93, and left and right side gears 95 and 96 meshing with the pinion 94. Therefore, while the rotation transmitted to the ring gear 91 is transmitted to the left and right drive shafts 97 and 98 by the differential device 90,
The drive shafts 97 and 98 can be made differential to absorb the difference in the number of rotations.

In the lowermost part of the torque transmission chamber 83, oil for lubrication and cooling is stored, and the ring gear 9
The oil is scraped as the 1 rotates. The scooped oil circulates through the counter drive gear 87, the counter driven gear 88, the output gear 89, the differential device 90, the ring gear 91, etc. in the torque transmission chamber 83, and the motor shaft 27 through the oil receiving pipe 110. Oil passage 1 inside
11 through an oil hole 108 formed in the motor shaft 27 and an oil groove 109 formed in the stopper 106 to the oil passage 120 formed in the rotor 37 by centrifugal force caused by the rotation of the rotor 37. Then, the rotor 37 is cooled, and the winding 39 is cooled by centrifugal force generated as the rotor 37 rotates.

By the way, the lead wire 39 of each winding 39
“a” respectively extend upward, and a crimp terminal 41 is connected to the tip of each lead wire 39a. And the crimp terminal 41 is
The connection member 51 is connected to the connection member 51 by the bolt b3 in the storage chamber 68. On the other hand, the output terminal 62 of each transistor module 13a of the inverter 13 is connected to the connecting member 51 and the bolt b4 in the inverter cover 16d. The connecting member 51 penetrates the base 16a from inside the inverter cover 16d and further penetrates the top wall 71 of the intermediate case 16b.
b. The connecting member 5 is provided in the intermediate case 16b.
An accommodation chamber 68 surrounding the lower end side of 1 is formed. In addition,
The transistor module 13a includes two transistors (not shown).

Each connecting member 51 is made of an insulating material (for example,
Sleeve-shaped bush 53 made of "nylon 66" (trade name), sleeve-shaped support 54 made of an insulating material (for example, "nylon 66"), and rod-shaped adapter 56 made of metal (for example, tough pitch copper). And the inverter 56 and the motor 15
Are electrically connected. The bush 53 extends downward from the abutting surface of the base 16a and the intermediate case 16b through a hole 118 formed in the top wall 71 of the intermediate case 16b. Extending upward through a hole 119 formed in the hole 16a;
The adapter 56 is provided inside the support 54 and the bush 5.
3. The bush 53 and the support 54 constitute an insulating member.

In this case, a bush 53 is provided between the adapter 56 and the top wall 71 of the intermediate case 16b.
The adapters 56 are electrically insulated from the motor case 14 and the inverter case 16 because the support members 54 are provided between the motor case 14 and the base 16a. Further, since the connecting member 51 for connecting the motor 15 and the inverter 13 is provided in the motor case 14 and the inverter case 16, the lead wire 39a can be extremely short. Therefore, generation of electromagnetic noise from the lead wire 39a can be sufficiently suppressed.

Further, since a part between the motor 15 and the inverter 13 can be connected by the adapter 56,
The cost of the motor drive device can be reduced as compared with the case where all are connected by lead wires. The bush 53
Has a flange 53a at the upper end, the support 54 has a flange 54a at the lower end, and the adapter 56 has a projection 56a at the center. Then, the flange portion 53a of the bush 53 and the flange portion 54a of the support member 54 are abutted so as to sandwich the projection 56a.
6b is abutted so as to sandwich the flange portions 53a and 54a. Therefore, the flange portion 5
A concave portion 57 for accommodating the projection 56a is provided on the upper surface of the projection 3a.
However, the flange portion 53 is provided on the lower surface of the base 16a.
a, a concave portion 58 for accommodating 54a is formed.

The bush 53 has a window 53
b is formed, and the adapter 56 is formed by the window 53b.
Is exposed, and the crimp terminal 41 is fixed to the lower end by a bolt b3. To this end, a mounting hole 56b is formed at the lower end of the adapter 56. An O-ring 63 as a first seal member is provided on the outer periphery of the bush 53, and an O-ring 64 as a second seal member is provided on the outer periphery of the adapter 56.
The space between the bush 53 and the top wall 71 of the intermediate case 16b and the space between the adapter 56 and the bush 53 are sealed. Therefore, it is possible to prevent oil, dust (dust) and the like in the motor storage chamber 18 from entering the inverter storage chamber 19 via the storage chamber 68, and to further improve the airtightness of the inverter storage chamber 19. Can be. Further, a sealing material (not shown) is applied between the intermediate case 16b and the base 16a, between the intermediate case 16b and the motor case 14, and between the intermediate case 16b and the cover 70, so that dust, water, etc. From entering the motor housing 18, the inverter housing 19 and the housing 68.

The flanges 53a and 54a and the adapter 56 are notched at two places in the circumferential direction to form detent surfaces S1 to S3, respectively. By the way, the adapter 56 is protruded upward from the support 54, and extends further upward through the current sensor 66 and the rubber spacer 67. Therefore, by fixing the output terminal 62 to the upper end of the adapter 56 with the bolt b4, the current sensor 66 can be pressed against the upper end of the support 54 and supported. To this end, a mounting hole 56c is formed at the upper end of the adapter 56.

Next, the intermediate case 16b will be described. FIG. 8 is a sectional view of the intermediate case according to the embodiment of the present invention. In the drawing, reference numeral 16b denotes an intermediate case. The intermediate case 16b includes a top wall 71, a back wall 72, and a side wall 73, and is connected to a storage chamber 68 surrounded by the top wall 71, the back wall 72, and the side wall 73. 51 is accommodated. An opening 74 is formed in the intermediate case 16b at a position on the front surface corresponding to the connection between the connecting member 51 and the crimp terminal 41 (FIG. 2).
The cover 70 is provided detachably. Therefore, by removing the cover 70, the housing chamber 68 can be accessed via the opening 74, and the connection member 51 and the crimp terminal 41 can be detached. Further, the connecting member 5
The motor case 14 can be separated from the intermediate case 16b and the bracket 16c in a state where the terminal 1 and the crimp terminal 41 are separated.

Therefore, since the motor 15 and the inverter 13 can be easily divided for maintenance and management, workability in maintenance and management of the motor driving device can be improved. Further, the O-ring 63,
64, the bush 53 and the intermediate case 16 respectively.
b between the top wall 71 and the adapter 56 and the bush 53
Between the motor 1 and the motor 1
Even in a state where it is separated from 5, it is possible to prevent dust, water, and the like from entering from outside into the inverter housing chamber 19 via the housing chamber 68. Therefore, the airtightness of the inverter accommodating chamber 19 can be maintained.

An opening 75 is formed on the lower surface of the intermediate case 16b, and the crimp terminal 41 extends to the accommodation chamber 68 via the opening 75. In the present embodiment, the opening 74 is connected to the intermediate case 16 b of the inverter case 16.
However, it can also be formed on the lid portion 14b of the motor case 14 (FIG. 3).

The present invention is not limited to the above embodiment, but can be variously modified based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0033]

As described above in detail, according to the present invention, in a motor driving device, a motor, a cylindrical portion, and a motor housing for housing the motor with one end of the cylindrical portion closed. A motor case having a lid forming a chamber, an inverter including a plurality of transistors, generating a phase current by turning on / off each of the transistors, and supplying the phase current to the motor; and the motor case. An inverter case, which is removably fixed directly above, forms an inverter accommodating chamber for accommodating the inverter, and has a dividing means for dividing the motor accommodating chamber and the inverter accommodating chamber, and penetrates the dividing means. And the other end is connected to the motor, and the other end is connected to the motor, and has a connecting member for electrically connecting the inverter and the motor. . One of the motor case and the inverter case has an opening at a position corresponding to a connection between the other end of the connecting member and the motor.
In addition, a cover is detachably provided in the opening.

In this case, by removing the cover, the connecting portion can be accessed through an opening provided in one of the motor case and the inverter case, and the connecting member and the motor can be detached. Furthermore, the motor case and the inverter case can be separated with the connecting member and the motor separated. Therefore, the motor and the inverter can be easily divided for maintenance and management, etc.
Workability in management and the like can be improved.

In another motor driving device of the present invention,
Further, one of the motor case and the inverter case has an intermediate case. The opening is formed in the intermediate case.

In this case, by removing the cover, the inside of the intermediate case can be accessed through the opening, and the connecting member and the motor can be attached and detached. Further, with the coupling member and the motor separated, one of the motor case and the inverter case can be separated from the intermediate case. Therefore, the motor and the inverter can be easily divided for maintenance / management and the like, so that workability in maintenance / management and the like of the motor driving device can be improved.

[0037] In still another motor drive device of the present invention, the connecting member further includes a metal rod-shaped adapter and an insulating member disposed between the adapter and the partitioning means. In this case, since a part between the motor and the inverter can be connected by the rod-shaped adapter, the cost of the motor driving device can be reduced as compared with the case where all are connected by the lead wire.

In still another motor driving device of the present invention, a first seal member is provided between the partitioning means and the insulating member, and a second seal member is provided between the insulating member and the adapter. Is done. In this case, it is possible to prevent oil, dust and the like in the motor accommodating chamber from entering the inverter accommodating chamber, so that the airtightness of the inverter accommodating chamber can be further improved. Further, even when the inverter is separated from the motor, it is possible to prevent dust, water, and the like from entering from outside into the inverter housing room via the motor housing room. Therefore, the airtightness of the inverter accommodating chamber can be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a motor drive device according to an embodiment of the present invention.

FIG. 2 is a first sectional view of the motor drive device according to the embodiment of the present invention.

FIG. 3 is a second sectional view of the motor drive device according to the embodiment of the present invention.

FIG. 4 is an exploded front view of the connecting member according to the embodiment of the present invention.

FIG. 5 is an exploded side view of the connecting member according to the embodiment of the present invention.

FIG. 6 is a plan view showing an attached state of a connecting member according to the embodiment of the present invention.

FIG. 7 is a front view showing an attached state of the connecting member according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view of the intermediate case according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Inverter 14 Motor case 15 Motor 16a Base 16b Intermediate case 18 Motor accommodation room 19 Inverter accommodation room 51 Connecting member 53 Bush 54 Support 56 Adapter 63, 64 O-ring 70 Cover 71 Top wall 74, 75, 115 Opening

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-8-65944 (JP, A) JP-A-8-214492 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 5/04 H02K 5/10

Claims (4)

(57) [Claims] 1. A motor, a cylindrical portion, and the cylindrical portion
A motor case having a lid part forming a motor housing chamber for housing the motor by closing one end of the motor case, a plurality of transistors, and a phase current is generated by turning on / off each of the transistors; An inverter for supplying a phase current to the motor; and a section detachably fixed directly above the motor case to form an inverter accommodating chamber for accommodating the inverter, and defining the motor accommodating chamber and the inverter accommodating chamber. An inverter case having means and a connecting member extending through the partitioning means, one end of which is connected to the inverter, and the other end of which is connected to the motor, and which electrically connects the inverter and the motor. , sales of the motor case and the inverter case
Chino one has an opening at a position corresponding to the connecting portion of the other end and the motor of the connecting member, a motor drive device, characterized in that the cover to the opening portion is detachably attached. 2. The motor case and the inverter case.
While comprises an intermediate casing of the motor driving device according to claim 1 wherein the openings formed in the casing between the middle. 3. The motor drive device according to claim 1, wherein the connecting member comprises a metal rod-shaped adapter and an insulating member disposed between the adapter and the partitioning means. 4. The motor drive according to claim 3 , wherein a first seal member is provided between the partitioning means and the insulating member, and a second seal member is provided between the insulating member and the adapter. apparatus.