JP2015048784A - Electric oil pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric oil pump which detects positional displacement between a pump plate and a pump housing, and can prevent the interference of a pump rotor.SOLUTION: A rubber-made contraction member 31 is arranged in a pump housing 15 in a state of being covered at an external periphery of a cylindrical iron frame 30. A plurality of piezoelectric elements 29 are arranged outside the radial direction of a boundary face between the pump housing 15 and a pump plate at equal intervals in the circumferential direction toward the outside of the radial direction from a center of a rotating shaft. A heat generation member 32 is arranged at an external peripheral face of the contraction member 31 opposing the piezoelectric elements 29 in a state of being closely adhered to the external peripheral face. When positional displacement is generated by an external force and the pump rotor 28 interferes, an output signal which is formed by converting a force received by each piezoelectric element 29 to a voltage is inputted into a controller 4, and a direction in which the positional displacement is generated is detected. By carrying electricity to the heat generation member 32 arranged in the direction in which the positional displacement is detected from the controller 4, the heat generation member 32 generates heat, the contraction member 31 is heated, and a heated portion is contracted in the radial direction.

Description

  The present invention relates to an electric oil pump device.

  Conventionally, a specific example of an electric oil pump device used as a hydraulic pump for a vehicle includes a combination of an oil pump that circulates fluid (oil) and an electric motor that drives the oil pump. An electric oil pump device has been proposed in which an electric motor shares a rotation shaft with an oil pump and is arranged side by side in the direction of the center axis of the oil pump, and the motor housing is integrally coupled to the pump housing to make it compact and lightweight ( For example, see Patent Document 1). According to the technique of Patent Document 1, a cylindrical portion having a smaller diameter than the motor housing is integrally formed at the center of the rear end surface of the pump housing, and the oil pump extends in the front-rear direction by a bearing device provided at the rear portion in the cylindrical portion. The rotating shaft of the drive electric motor is cantilevered.

JP 2010-112302 A

  In the electric oil pump device as described above, when an external force is applied and the radial positions of the pump plate and the pump housing are shifted in the opposite directions, the rotation shaft of the electric motor is inclined, and the pump rotor, the pump plate, and the pump housing Interference may occur during As a result, the rotating shaft is squeezed by the bearing inner ring and friction is increased, and an axial force acts on the rotating shaft due to relative displacement between the permanent magnet of the motor rotor and the motor stator. For this reason, there is a possibility that the load on the electric motor increases and the starting torque increases.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric oil pump device that can detect displacement between a pump plate and a pump housing and prevent interference with a pump rotor. There is.

  In order to solve the above-mentioned problems, according to a first aspect of the present invention, in the electric oil pump device, the pump rotor is rotatably supported around the rotation axis in the pump chamber formed between the pump plate and the pump housing. A metal oil pump, an electric motor which is provided adjacent to the oil pump in the direction of the rotation axis, and which rotates the pump rotor, and is rotatably supported by the pump housing, and the pump rotor and the electric motor A metal rotating shaft that connects the rotor of the motor, and a motor housing of the electric motor that is formed on the opposite side of the oil pump and housed in a control chamber covered with a cover to drive the electric motor A controller for controlling the oil pump, wherein the oil pump faces the outside of the outer peripheral surface of the pump rotor. A misalignment adjusting means is provided on the outer periphery of the fitted cylindrical fixing member and adjusts a misalignment in the radial direction between the pump plate and the pump housing, and the misalignment adjusting means includes the pump A plurality of circumferentially arranged plates between the pump housing and the pump housing; a stress detecting means for detecting a force received by the occurrence of the displacement; a cylindrical contracting member covering an outer periphery of the fixing member; A gist is provided with a misalignment correction unit that corrects the misalignment, and has a plurality of heat generating members that are disposed in contact with an outer peripheral surface and thermally contract the contraction member.

  According to a second aspect of the present invention, in the electric oil pump device according to the first aspect, the heat generating members of the stress detecting means and the misregistration correcting means face the same line in the radial direction from the center of the rotation axis. The gist is that they are arranged at equal intervals on the circumference.

  According to a third aspect of the present invention, in the electric oil pump device according to the second aspect, the heat generating members of the stress detecting means and the misalignment correcting means are connected to the controller, and an output signal of the stress detecting means The gist is to detect the direction of occurrence of the displacement and the amount of displacement, and to energize the heat generating member so as to offset the amount of displacement and the amount of thermal contraction of the contracting member.

  According to the first aspect of the present invention, the stress detection means is provided in the pump housing to detect the force received by the occurrence of the radial displacement between the pump plate and the pump housing, and the outer periphery of the pump rotor is outside. A misalignment adjusting means having a misalignment correcting means composed of a heat generating member and a contracting member is installed opposite to the above, and a gap is formed by thermal contraction to prevent misalignment. For this reason, even if interference occurs between the pump rotor, the pump plate, and the pump housing, the positional deviation can be corrected and interference of the pump rotor can be suppressed. As a result, it is possible to reduce the load on the electric motor and prevent an increase in starting torque.

  According to the second aspect of the present invention, since the stress detecting means and the heat generating member of the misalignment correcting means are installed facing the same radial position at equal intervals in the circumferential direction, they are substantially uniform over the entire circumference. Thus, it is possible to detect the direction of occurrence of misalignment and to secure a gap at the position in the direction of occurrence of misalignment. For this reason, a clearance can be adjusted and interference can be suppressed with respect to interference of a pump rotor.

  According to the invention of claim 3, since the stress detecting means and the heat generating member of the positional deviation correcting means are connected to and input to a controller that drives the electric motor, there is no need to provide a dedicated control circuit board, The amount of deviation and the amount of thermal contraction of the contracting member can be offset to suppress interference of the pump rotor. As a result, it is possible to reduce the load on the electric motor and prevent an increase in starting torque.

1 is a longitudinal sectional view of an electric oil pump device according to an embodiment of the present invention. The figure which shows schematic structure of the piezoelectric element and electrothermal contraction apparatus in FIG. (A) is a schematic sectional drawing when a pump rotor interferes, (b) is a schematic sectional drawing of the pump rotor after adjusting deviation | shift amount.

Hereinafter, an electric oil pump device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of an electric oil pump device 1 according to an embodiment of the present invention.
As shown in FIG. 1, an electric oil pump device 1 is used as, for example, a hydraulic pump for an automobile transmission, and rotates an oil pump (for example, an internal gear pump) 2 and an oil pump 2 (hereinafter referred to as an oil pump 2). (Referred to as a brushless motor) 3 is integrated in the housing. The brushless motor 3 is a brushless sensorless motor having a three-phase winding. A controller (ECU) 4 that controls the rotation of the brushless motor 3 is also incorporated in the housing.

  The electric oil pump device 1 is fastened and fixed to a transmission or an engine case (not shown) via a plurality of flange portions protruding from the end face of the pump plate 14 with bolts arranged in a circumferential direction with respect to the axis center through an attachment hole. Has been. In the following description, the left side of the drawing is the front and the right side is the rear.

  Here, the oil pump 2 uses a trochoid curved pump (see FIG. 2), and has outer teeth on the inner peripheral side of a pump outer rotor (hereinafter referred to as an outer rotor) 11 having inner teeth having a trochoidal tooth profile. A pump inner rotor (hereinafter referred to as an inner rotor) 12 is engaged, and a pump rotor 28 including the outer rotor 11 and the inner rotor 12 is eccentrically disposed in a pump housing 15 so as to be rotatable.

  The inner rotor 12 is externally fitted and fixed to a portion of the rotary drive shaft (rotary shaft) 7 that is closer to the front than the portion of the brushless motor 3 that will be described later, and rotates together with the rotary drive shaft 7. Yes. The outer rotor 11 has one more internal tooth than the outer teeth of the inner rotor 12, and is arranged so as to be rotatable in the pump housing 15 around a position eccentric with respect to the rotational drive shaft 7. Further, the inner rotor 12 rotates with its outer teeth meshing with the inner teeth of the outer rotor 11 at a part of its entire circumference, and each outer tooth substantially inscribed in the inner surface of the outer rotor 11 at various locations around the entire circumference. ing.

  Therefore, when the rotational drive shaft 7 is rotationally driven by the brushless motor 3, the volume of the gap between the outer rotor 11 and the inner rotor 12 of the oil pump 2 repeatedly expands and contracts during one rotation of the rotational drive shaft 7. As a result, a pumping operation is performed in which oil is sent from an import (suction port, not shown) provided in the pump plate 14 leading to the gap toward an outport (discharge port, not shown).

  The pump plate 14 and the pump housing 15 constituting the housing of the oil pump 2 are made of a metal nonmagnetic material (for example, aluminum die casting). The motor housing 17 and the cover 20 that house the brushless motor 3 are made of a thermoplastic resin material (for example, PPS, PBT resin, etc.). The housing body of the electric oil pump device 1 includes the pump plate 14, the pump housing 15, the motor housing 17, and the cover 20. Here, the motor housing 17 and the cover 20 form a waterproof housing.

  The motor housing 17 has a cylindrical shape, and a front end thereof is fixed to a portion near the outer periphery of the rear surface of the pump housing 15 via an oil seal 25. The rear end opening of the motor housing 17 is closed by the cover 20.

  The pump housing 15 is a thick plate-like case that expands in the radial direction, and a pump chamber 13 having a front opening is formed at the center thereof. A pump plate 14 is fixed to the front surface of the pump housing 15 via an O-ring 16, and the front surface of the pump chamber 13 is closed. An outer rotor 11 constituting the oil pump 2 is rotatably accommodated in the pump chamber 13, and an inner rotor 12 that meshes with the inner rotor 12 is disposed inside the outer rotor 11. The pump plate 14 is provided with a suction port and a discharge port penetrating in the axial direction.

  The brushless motor 3 includes a rotating motor rotor (hereinafter referred to as “rotor”) 6 and a motor stator (hereinafter referred to as “stator”) 5 fixed to the outside of the outer peripheral surface of the rotor 6. The rotor 6 is formed by arranging, for example, a plurality of permanent magnets 8 along the circumferential direction on the outer peripheral surface of the rotary drive shaft 7. The rotation drive shaft 7 is a metal rotation shaft shared by the brushless motor 3 and the oil pump 2.

  A cylindrical portion smaller in diameter than the motor housing 17 is integrally formed at the center of the rear end surface of the pump housing 15, and the rotary drive shaft 7 extending in the front-rear direction is cantilevered by bearings 26 and 27 provided at the rear portion in the cylindrical portion. Has been. In this embodiment, the bearings 26 and 27 are ball bearings that are two rolling bearings adjacent to the front and rear, the inner rings of both the bearings 26 and 27 are fixed to the rotary drive shaft 7, and the outer rings are fixed to the cylindrical portion. ing. The front portion of the rotary drive shaft 7 passes through a hole formed in the rear wall of the pump housing 15 and enters the pump chamber 13, and the front end thereof is connected to the inner rotor 12. An oil seal 25 is provided between a portion of the inner circumference of the cylindrical portion in front of the bearings 26 and 27 and the rotary drive shaft 7.

  The tip of the rotary drive shaft 7 that penetrates the inner rotor 12 of the pump rotor 28 is fitted into the pump plate 14 and fixed by a metal bush (for example, a winding bush) 34. On the inner periphery of the pump housing 15 outside the outer peripheral surface of the outer rotor 11 of the pump rotor 28, a cylindrical iron frame (fixing member) 30 and a cylindrical rubber contracting member 31 that covers the outer peripheral surface are rotor receiving portions. The electrothermal contraction device (positional deviation adjusting means) 33 is configured together with the heat generating member 32 (see FIG. 2) which is fixed as described above and arranged in close contact with the outer peripheral surface of the contracting member 31. A plurality of piezoelectric elements (stress detection means) 29 are installed in the circumferential direction on the boundary surface between the pump housing 15 and the pump plate 14. Here, as the piezoelectric element 29, for example, a pressure sensor (piezo element) that converts a force applied using the piezoelectric effect into a voltage and outputs the voltage is used.

  A rotor 6 constituting the brushless motor 3 is fixed to a rear end portion of the rotary drive shaft 7 protruding rearward from the cylindrical portion. The rotor 6 is formed in a cylindrical shape extending in the radial direction from the rear end of the rotary drive shaft 7 and surrounding the outer periphery of the bearings 26 and 27, and the permanent magnet 8 is provided on the outer periphery thereof. More specifically, the rotor 6 includes a perforated disc portion of the rotor core 10 and a cylindrical portion integrally formed on the outer periphery thereof, and the inner periphery of the disc portion is fixed to the rotary drive shaft 7, and the cylindrical portion Permanent magnets 8 are provided on the outer periphery. The axial position of the center of gravity of the rotating portion including the rotary drive shaft 7, the rotor 6 and the inner rotor 12 of the oil pump 2 is within the axial range of the bearings 26 and 27. In the present embodiment, the axial position of the center of gravity is between the two ball bearings constituting the bearings 26 and 27.

  In the stator 5, a plurality of inward salient poles (teeth) of the stator core 9 are arranged outside the outer peripheral surface of the rotor 6 through a slight air gap. A coil 19 is wound around each tooth of the stator core 9. Here, in order to insulate the coil 19 from the stator core 9, resin insulators 18 are mounted from both axial ends of the stator core 9.

  In the electric oil pump device 1 of the present embodiment, the control board 23 of the controller 4 for controlling the brushless motor 3 is accommodated in the control chamber 21 formed at the rear end of the motor housing 17 and attached to the motor housing 17. ing. On the control board 23, based on the inverter circuit that converts the DC power source into AC and supplies a drive current to each coil 19 of the brushless motor 3, and the rotational position information of the outer rotor 11 detected by a sensor such as a Hall element, A control circuit for controlling the inverter circuit is mounted. On both surfaces of the control board 23, electronic components 22 such as a microcomputer, an IC, a capacitor, and a coil of the above circuit constituting the controller 4 are mounted (in the figure, the electronic components 22 attached to the rear surface of the control board 23). An example).

  With the above configuration, the drive current controlled by the controller 4 is supplied to each coil 19 of the brushless motor 3. As a result, a rotating magnetic field is generated in the coil 19, torque is generated in the permanent magnet 8, and the rotor 6 is rotationally driven. Thus, when the inner rotor 12 is rotationally driven, the outer rotor 11 is driven and rotated, and the gap between the inner teeth of the outer rotor 11 and the outer teeth of the inner rotor 12 is repeatedly expanded and contracted. In addition, a pump operation for sucking and discharging oil through the discharge port is performed.

  The motor housing 17 and the cover 20 are joined to the fixed motor housing 17 by rotating the cover 20 and welding them together by frictional heat generated by rotation, for example, by spin welding. Here, in the center of the cover 20, in order to adjust the pressure (pressure) difference between the inside and outside of the motor housing 17 due to a sudden temperature change of the brushless motor 3 in the environment where the oil pump 2 is used, the outside and inside of the motor housing 17 are arranged. Is provided with a circular breathing hole 35 extending from one surface to the opposite surface in the axial direction of the oil pump 2. Further, a filter 24 covering the breathing hole 35 is fixed to the inner surface of the cover 20, and this filter 24 blocks water and allows air to pass through.

Next, FIG. 2 is a diagram showing a schematic configuration of the piezoelectric element 29 and the electrothermal contraction device 33 in FIG.
As shown in FIG. 2, a rubber shrink member (for example, a heat-shrink rubber tube) 31 having a large shrinkage rate is covered on the outer periphery of a circular iron frame 30 when viewed from the axial direction. Installation is fixed. A plurality (eight in the present embodiment) of the boundary between the pump housing 15 and the pump plate 14 (see FIG. 1) are arranged at equal intervals in the circumferential direction from the center of the rotating shaft toward the radially outer side. A piezoelectric element 29 is arranged. Each piezoelectric element 29 faces the outer peripheral surface of the contracting member 31. A plurality (eight in this embodiment) of heat generating members (e.g., nichrome wire) 32 are arranged in contact with the outer peripheral surface of the contracting member 31 at positions facing the piezoelectric element 29 as a pair. .

  When the pump housing 15 is displaced due to an excessive external force (for example, generated during transportation or adjustment), the rotational drive shaft 7 is tilted and the pump rotor 28 interferes, the force that each piezoelectric element 29 receives Is output to the controller 4 to detect the direction in which the positional deviation has occurred (position on the circumference, four directions in the present embodiment). When the controller 4 energizes the heat generating member 33 in the direction (position on the circumference) in which the misalignment is detected, the heat generating member 33 generates heat, the closely contacted contracting member 31 is heated, and the portion heated in the radial direction is Shrink. For this reason, for example, a gap due to thermal contraction is formed on the side where the positional deviation occurs, the thermal contraction amount and the deviation amount are offset, interference of the pump rotor 28 is suppressed, and the tilt of the rotary drive shaft 7 is eliminated. As a result, normal rotation of the brushless motor 3 can be obtained, and an increase in starting torque can be prevented.

Next, FIG. 3A is a schematic sectional view when the pump rotor 28 interferes, and FIG. 3B is a schematic sectional view of the pump rotor 28 after adjusting the deviation amount.
As shown in FIG. 3A, when an external force causes a positional shift indicated by an arrow in the radial direction between the pump housing 15 and the pump plate 14 and the rotation drive shaft 7 is inclined (the rotation axis is indicated by a two-dot chain line). As shown, the pump rotor 28 interferes with the pump housing 15 and the pump plate 14. At this time, for example, a force (indicated by an arrow) pressing one side (left side in the figure) of the outer rotor 11 upward in the axial direction and the other side (right side in the figure) downward in the axial direction works, and the pump rotor 28 and the pump housing No. 15 is pushed rightward and is displaced due to a displacement in the direction indicated by the arrow in the figure. At this time, referring to FIG. 1, the vicinity of the rear end portion of the rotary drive shaft 7 connected to the rotor 6 is distorted by the inner ring of the bearing 26.27 and the friction increases, and the permanent magnet 8 of the rotor 6 and the stator As a result of the relative displacement to 5, an axially upward force (in the right direction in FIG. 1) acts on the rotational drive shaft 7, the motor load increases, and the rotational drive shaft 7 is prevented from rotating.

  As shown in FIG. 3B, when the direction in which the positional deviation occurs is detected by the piezoelectric element 29 (see FIG. 2) and the contracting member 31 is thermally contracted by the amount of deviation C (right direction in the figure), A gap is formed in the pump housing 15 to offset the deviation amount C. As a result, the pump rotor 28 is returned to the right and the rotation drive shaft 7 is not inclined. As a result, the rotor receiving portion (the iron frame 30 and the contracting member 31) has a function of adjusting the displacement of the pump rotor 28, reduces the load on the brushless motor 3 (see FIG. 1), and reduces the output torque at startup. can do.

  Next, the operation and effect of the electric oil pump device 1 according to the present embodiment configured as described above will be described.

  According to the above configuration, in the electric oil pump device 1 in which the oil pump 2, the brushless motor 3, and the controller 4 are arranged side by side in the rotational axis direction of the oil pump 2, the circumferential direction is between the pump housing 15 and the pump plate 14. When a displacement of the pump housing 15 occurs due to an external force, a plurality of (eight in this embodiment) piezoelectric elements 29 are provided. 4 directions), and an electrothermal contraction device 33 comprising a heat generating member 32 and a contracting member 31 is installed outside the outer peripheral surface of the pump rotor 28 to thermally contract the contracting member 31 in the direction in which the misalignment has occurred. A gap was formed. Since the piezoelectric element 29 and the heat generating member 32 are installed at the same radial position at equal intervals in the circumferential direction, the direction of occurrence of positional deviation is detected almost uniformly over the entire circumference, and the position in the direction of occurrence of positional deviation is detected. A gap can be formed. For this reason, it becomes possible to adjust a clearance and suppress interference. The piezoelectric element 29 and the heat generating member 32 are connected to the controller 4 that drives the brushless motor 3, and the controller 4 receives an output signal from the piezoelectric element 29 and energizes the heat generating member 32 to generate heat.

  As a result, even if the pump rotor 28 interferes with the pump housing 15 and the pump plate 14, the contraction member 31 in the direction in which the displacement of the pump housing 15 has occurred is thermally contracted to form a gap, thereby causing the displacement of the pump housing 15. The amount C can be offset by this gap. As a result, it is possible to reduce the load on the brushless motor 3 and prevent an increase in starting torque. Further, it is not necessary to provide a dedicated control circuit board for inputting / outputting the piezoelectric element 29 and the heat generating member 32, and the gap can be easily adjusted.

  As described above, according to the present embodiment, it is possible to provide an electric oil pump device that can detect a displacement between the pump plate and the pump housing and prevent interference with the pump rotor.

  Although one embodiment according to the present invention has been described above, the present invention can also be implemented in other forms.

  In the said embodiment, although the example comprised by the eight heat generating members 32 arrange | positioned on the circumference at equal intervals in the electrothermal contraction apparatus 33 was shown, it is not limited to this, The direction to heat-shrink Any number can be used as long as (position) can be accurately set. Moreover, the heat generating member 32 is not limited to a single nichrome wire, and may have a width in the circumferential direction (for example, a plurality of nichrome wires arranged).

  In the above-described embodiment, the example in which the contraction member 31 on the side where the positional deviation is detected is thermally contracted has been described. However, the present invention is not limited to this. You may make it shrink. Further, a plurality of heat generating members 32 near the detected direction may be energized.

  In the above-described embodiment, the example in which the piezoelectric elements 29 and the heat generating members 33 are arranged in pairs on the circumference at equal intervals has been described. However, the present invention is not limited to this, and is arranged in the circumferential direction so that adjustment is possible. The arrangement may be shifted or the number of both may be increased or decreased.

  In the above embodiment, a case where a trochoid curve type pump is used as the inscribed gear pump has been described. However, the present invention is not limited to this, and the inner rotor 12 provided with inner teeth on the inner peripheral side of the outer rotor 11 and provided with outer teeth. The internal gear pump may be any internal gear pump in which the volume of the gap partitioned by the inscribed portion between the outer rotor 11 and the inner rotor 12 repeats expansion and contraction by rotating eccentrically while meshing. Further, the inner teeth of the outer rotor 11 and the outer teeth of the inner rotor 12 are not necessarily formed in a clear so-called tooth shape, and may be protrusions, protrusions, or engaging portions.

  In the above-described embodiment, the case where a plurality of permanent magnets 8 are arranged and fixed on the outer peripheral portion of the rotary drive shaft 7 as the rotor 6 of the brushless motor 3 has been described. You may make it use what fixed the permanent magnet.

  In the above embodiment, the brushless motor 3 in which the rotary drive shaft 7 is cantilevered as an electric motor for driving the oil pump has been described as an example. However, the present invention is not limited to this. It may be a brushless motor supported by bearings inside the pump housing 15 and the motor housing 17.

1: electric oil pump device, 2: oil pump, 3: brushless motor (electric motor), 4: controller, 5: stator for motor, 6: rotor for motor,
7: rotational drive shaft (rotary shaft), 8: permanent magnet, 9: stator core, 10: rotor core,
11: Outer rotor for pump, 12: Inner rotor for pump, 13: Pump chamber,
14: Pump plate, 15: Pump housing, 16: O-ring,
17: Motor housing, 18: Insulator, 19: Motor coil, 20: Cover, 21: Control room, 22: Electronic component, 23: Control board, 24: Filter, 25: Oil seal, 26, 27: Bearing, 28: Pump rotor, 29: piezoelectric element (stress detecting means),
30: Iron frame (fixing member), 31: Shrink member, 32: Heat generating member,
33: electrothermal contraction device (positional deviation adjusting means), 34: fixed bush, 35: breathing hole,
C: Deviation amount

Claims (3)

A metal oil pump in which a pump rotor is rotatably supported around a rotation axis in a pump chamber formed between a pump plate and a pump housing;
An electric motor provided adjacent to the oil pump in the direction of the rotation axis and driving the pump rotor;
A metal rotary shaft that is rotatably supported by the pump housing and connects the pump rotor and the rotor of the electric motor;
A controller that is formed on the motor housing of the electric motor on the opposite side of the oil pump, is housed in a control chamber whose opening is covered with a cover, and drives and controls the electric motor,
The oil pump is
It is installed on the outer periphery of a cylindrical fixing member fitted to the pump housing so as to face the outside of the outer peripheral surface of the pump rotor, and adjusts the radial positional deviation between the pump plate and the pump housing. A displacement adjustment means;
The positional deviation adjusting means is
A plurality of circumferentially arranged between the pump plate and the pump housing, stress detecting means for detecting the force received by the occurrence of the displacement;
A misalignment that corrects the misalignment, comprising: a cylindrical contracting member that covers the outer periphery of the fixing member; and a plurality of heat generating members that are disposed in contact with the outer peripheral surface of the contracting member and thermally contract the contracting member. An electric oil pump device comprising: a correction unit. The electric oil pump device according to claim 1,
The electric oil pump device characterized in that the heat generating members of the stress detecting means and the positional deviation correcting means are arranged at equal intervals on the circumference facing the same line in the radial direction from the center of the rotation axis. In the electric oil pump device according to claim 2,
The heat generating members of the stress detection means and the positional deviation correction means are connected to the controller, detect the generation direction and the deviation amount of the positional deviation based on the output signal of the stress detection means, and the deviation amount and the contraction. An electric oil pump device, wherein the heat generating member is energized so as to cancel out the amount of heat shrinkage of the member.

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