JP2021044921A - Rotary electric machine unit and magnet temperature estimation method - Google Patents

Abstract

To provide a rotary electric machine unit and magnet temperature estimation method that enable the temperature of a magnet of a rotor to be estimated accurately.SOLUTION: A rotary electric machine unit 10 includes: a rotary shaft 60; a rotary electric machine 12; and a gear mechanism 80. The rotary electric machine 12 has a rotor 14 that rotates integrally with the rotary shaft 60, and a stator 32. The rotor 14 has a magnet 16 assembled with a rotor core 78. The gear mechanism 80 is assembled with the rotary shaft 60, and is arranged so as to at least partially overlap the rotor 14 in the axial direction on the radially inner side of the rotor 14. The rotary electric machine unit 10 includes a temperature detection unit 104 that detects a temperature Tc of a coolant 58 moving to the radially outer side from the gear mechanism 80, and a magnet temperature calculation unit 121 that calculates Tm of the magnet 16 based on the temperature Tc detected by the temperature detection unit 104.SELECTED DRAWING: Figure 3

Description

The present invention relates to a magnet temperature estimation method for estimating a magnet temperature in a rotary electric machine unit mounted on an electric vehicle or the like and a rotary electric machine unit mounted on an electric vehicle or the like.

In a rotating electric machine having a rotor provided with a magnet and a stator, demagnetization of the magnet occurs when the temperature of the magnet exceeds the limit temperature. Therefore, it is necessary to properly control the temperature so that the temperature of the magnet does not exceed the limit temperature. However, since the rotor rotates at high speed, it is difficult to directly detect the temperature of the magnet.

Therefore, Patent Document 1 describes the voltage and current of the rotary electric machine, the rotation angle and rotational torque of the rotor, and the cooling oil stored in the bottom of the case accommodating the rotary electric machine and the transmission without directly detecting the temperature of the magnet. A magnet temperature estimation method for calculating the estimated temperature of a magnet based on the temperature is disclosed.

Japanese Unexamined Patent Publication No. 2014-092455

However, in the magnet temperature estimation method of Patent Document 1, the estimated temperature of the magnet is calculated based on a large number of parameters, but since a rounding error occurs in each of the large number of parameters, the estimated temperature of the magnet is determined by the rounding error of each parameter. The error in calculation becomes large. Further, the cooling oil stored in the bottom of the case is supplied to the transmission through the flow path outside the case and then supplied to the rotor to cool the rotor. Therefore, the temperature of the cooling oil stored in the bottom of the case has a large deviation from the temperature of the cooling oil immediately before being supplied to the rotor. Therefore, if the estimated temperature of the magnet is calculated based only on the temperature of the cooling oil stored in the bottom of the case, the calculated estimated temperature of the magnet will have a large error from the actual temperature of the magnet.

As described above, the magnet temperature estimation method of Patent Document 1 has a problem in the accuracy of the calculated estimated magnet temperature.

The present invention provides a rotary electric machine unit and a magnet temperature estimation method capable of accurately estimating the temperature of a rotor magnet.

The present invention
Rotating shaft and
A rotary electric machine having a substantially ring-shaped rotor that rotates integrally with the rotary shaft, and a stator arranged at predetermined intervals in the radial direction from the outer peripheral surface of the rotor.
A gear mechanism assembled on the rotating shaft and arranged radially inside the rotor.
The rotor has a substantially annular rotor core and a magnet attached to the rotor core.
The gear mechanism is arranged so that at least a part of it overlaps with the rotor in the axial direction.
The rotor is a rotary electric machine unit cooled by a refrigerant supplied from the gear mechanism.
A temperature detection unit that detects the temperature of the refrigerant moving radially outward from the gear mechanism, and
The magnet temperature calculation unit includes a magnet temperature calculation unit that calculates the estimated temperature of the magnet based on the temperature detected by the temperature detection unit.

In addition, the present invention
Rotating shaft and
A rotor having a substantially annular shape that rotates integrally with the rotary shaft, and a rotary electric machine having a stator arranged at a predetermined distance from the outer peripheral surface of the rotor.
A gear mechanism assembled on the rotating shaft and arranged radially inside the rotor.
The rotor has a substantially annular rotor core and a magnet attached to the rotor core.
The rotor is a magnet temperature estimation method for estimating the temperature of the magnet in a rotary electric machine unit, which is cooled by a refrigerant supplied from the gear mechanism.
A refrigerant temperature detection step of detecting the temperature of the refrigerant moving radially outward from the gear mechanism, and
The magnet temperature calculation step of calculating the estimated temperature of the magnet based on the temperature detected in the refrigerant temperature detection step is included.

According to the present invention, since the estimated temperature of the rotor magnet is calculated based on the temperature of the refrigerant moving radially outward from the gear mechanism, the temperature of the rotor magnet can be estimated accurately.

It is a block diagram of the vehicle which mounted the rotary electric machine unit of one Embodiment of this invention. It is a partial cross-sectional view of the cooling system of the vehicle which mounted the rotary electric machine unit of one Embodiment of this invention. It is a partial cross-sectional view which shows the flow of cooling oil in the rotary electric machine unit of FIG. 2 is an enlarged partial cross-sectional view of the planetary gear mechanism of FIGS. 2 and 3. It is a perspective view of the side cover of FIG.

Hereinafter, an embodiment of the rotary electric machine unit of the present invention will be described with reference to the accompanying drawings.

[Outline configuration of vehicle equipped with rotary electric machine unit]
As shown in FIG. 1, the rotary electric machine unit 10 of the present embodiment is mounted on the vehicle 18. In the present embodiment, the vehicle 18 on which the rotary electric machine unit 10 is mounted is a hybrid vehicle.

The vehicle 18 is equipped with an engine 20, a transmission 22, a rotary electric machine 12, a battery 28, a PDU (Power Drive Unit) 30, and an ECU (Electronic Control Unit) 120. The engine 20 and the transmission are mounted on the vehicle 18. The 22 is connected via a clutch 24, and the rotary electric machine 12 and the transmission 22 are connected by a rotary shaft 60. The ECU 120 controls the entire vehicle 18. The PDU 30 converts the electric power supplied from the battery 28 to the rotary electric machine 12 and the electric power supplied from the rotary electric machine 12 to the battery 28 based on the control signal from the ECU 120.

[Rotating machine unit]
The rotary electric machine unit 10 is a unitized version of the rotary shaft 60, the rotary electric machine 12, and a part of the transmission 22.

In the following description, front / rear, left / right, and up / down will be described according to the direction seen from the operator of the vehicle 18 with the rotary electric machine unit 10 mounted on the vehicle 18. Further, reference numerals L, R, U, and D in FIGS. 2 to 4 indicate left, right, upward, and downward, respectively, according to the directions seen from the operator of the vehicle 18.

As shown in FIGS. 2 and 3, the rotary electric machine unit 10 includes a rotary shaft 60, a rotary electric machine 12, a planetary gear mechanism 80, a case 40, and a side cover 42. The planetary gear mechanism 80 is a part of the configuration of the transmission 22. The rotary electric machine 12 and the planetary gear mechanism 80 are housed in the case 40.

The rotary shaft 60 extends in the left-right direction and is a cylindrical hollow member.

In the following description, for the sake of simplicity and clarity, the terms axial direction, radial direction, and circumferential direction refer to directions with reference to the rotation axis of the rotation shaft 60.

The rotary electric machine 12 generates the driving force of the vehicle 18 based on the electric power supplied from the battery 28 via the PDU (Power Drive Unit) 30. Further, the rotary electric machine 12 charges the battery 28 by outputting the regenerative power generated by performing the regenerative operation to the battery 28 via the PDU 30.

The rotary electric machine 12 includes a substantially annular rotor 14 that rotates integrally with the rotating shaft 60 as an inner rotor type rotating body, and a stator 32 that is arranged at a predetermined distance in the radial direction from the outer peripheral surface of the rotor 14. , Have.

The rotor 14 has a substantially ring-shaped rotor core 78 and a magnet 16 attached to the rotor core 78. In the present embodiment, the rotary electric machine 12 is a so-called IPM (Interior Permanent Magnet Motor) type rotary electric machine including a magnet-embedded rotor in which a magnet 16 is embedded in a rotor 14.

The stator 32 has a substantially annular stator core 92 arranged radially from the outer peripheral surface of the rotor 14 at a predetermined interval, and a coil 96 formed by winding a lead wire 94 around the stator core 92. ..

A bottomed tubular member 62 is attached to the rotating shaft 60 substantially coaxially with the rotating shaft 60. The tubular member 62 includes a bottom portion 72 fixed to the outer periphery of the rotating shaft 60 on the left side in the axial direction, and a side portion 74 extending to the right side in the axial direction from the outer edge of the bottom portion 72. The rotor 14 is assembled on the outer circumference of the side portion 74. The space inside the side portion 74 is formed as an opening 76.

The bottom portion 72 of the tubular member 62 projects from the base portion 82 to the right side in the axial direction from the base portion 82, the first protruding wall portion 84 projecting from the base portion 82 to the left in the axial direction, and substantially facing the first protruding wall portion 84. It has a second protruding wall portion 86. The base 82 extends along the radial direction.

The planetary gear mechanism 80 is assembled to the rotary shaft 60 and arranged in the opening 76. Therefore, the planetary gear mechanism 80 is arranged inside the rotor 14 in the radial direction so that at least a part thereof overlaps with the rotor 14 in the axial direction.

As shown in FIG. 4, the planetary gear mechanism 80 includes a sun gear 106 that is substantially coaxially assembled to the rotating shaft 60, a plurality of planetary gears 108 as pinion gears that mesh with the sun gear 106, and an outer gear that meshes with each planetary gear 108. The ring gear 110 and the planetary carrier 114 for connecting and fixing the gear shaft 112 of each planetary gear 108 are provided.

A bearing 116 is interposed between the outer peripheral surface of the gear shaft 112 and the planetary gear 108. In this case, the bearing 116 is fixed to the outer peripheral surface of the gear shaft 112, and the planetary gear 108 is rotatably mounted on the bearing 116 in response to the rotation of the sun gear 106. Further, a thrust washer 118 is interposed between both ends of the bearing 116 and the planetary gear 108 in the left-right direction and the planetary carrier 114 in order to suppress rattling of the bearing 116 and the planetary gear 108 in the left-right direction. ..

Therefore, when the sun gear 106 rotates with the rotation of the rotating shaft 60, each planetary gear 108 that meshes with the sun gear 106 rotates, and the ring gear 110 that meshes with each planetary gear 108 can be rotated.

[Cooling mechanism]
As shown in FIGS. 3 and 5, the side cover 42 is a disk-shaped lid that covers the rotary electric machine 12 housed in the case 40. The side cover 42 has a single introduction hole 44, a flow path 46, a single first discharge hole 48, a single second discharge hole 50, and a plurality of third discharge holes so as to face the rotary electric machine 12. 52 is formed. A flow path 54 is connected to the introduction hole 44, and cooling oil 58 is supplied from the pump 56 via the flow path 54.

The cooling oil 58 is preferably a lubricating oil that lubricates the transmission 22. For example, if the transmission 22 is an automatic transmission, ATF (Automatic Transmission Fluid) can be used as the cooling oil 58. The pump 56 may be either an electric pump or a mechanical pump. The cooling oil 58 is supplied from the pump 56 when the rotor 14 is rotating by the operation of the rotary electric machine 12 and the transmission 22. The solid line arrow in FIG. 3 schematically illustrates the flow of the cooling oil 58 in the vehicle 18.

The first discharge hole 48, the second discharge hole 50, and the third discharge hole 52 are nozzle-shaped, and the cooling oil 58 supplied from the pump 56 via the flow path 54, the introduction hole 44, and the flow path 46 is supplied. Inject or discharge to the rotor 14 and the stator 32. More specifically, the first discharge hole 48 mainly injects or discharges the cooling oil 58 toward the rotating shaft 60 of the rotor 14, and the second discharge hole 50 mainly is a tubular member constituting the rotor 14. The cooling oil 58 is injected or discharged toward the 62, and the third discharge hole 52 mainly injects or discharges the cooling oil 58 toward the stator 32.

The hollow portion of the rotating shaft 60 is formed as a single first axial flow path 66 extending in the axial direction (left-right direction). At the end facing the first discharge hole 48, the cooling oil 58 that communicates with the first axial flow path 66 and is injected or discharged from the first discharge hole 48 is guided to the first axial flow path 66. Shaft opening 68 is formed. Further, on the outer circumference of the rotary shaft 60, a plurality of second axial flow paths 70 are formed so as to communicate the outside of the rotary shaft 60 with the first axial flow path 66.

Therefore, the cooling oil 58 supplied from the first discharge hole 48 to the first axial flow path 66 through the shaft opening 68 is discharged from the rotary shaft 60 via each second axial flow path 70. The released cooling oil 58 is supplied to the transmission 22 including the rotor 14 and the planetary gear mechanism 80.

A plurality of through holes 88 penetrating in the axial direction (left-right direction) are formed in the base portion 82 of the tubular member 62 at positions radially inside the first protruding wall portion 84 and the second protruding wall portion 86. There is. Then, the cooling oil 58 injected from the side cover 42 to the bottom 72 is supplied to the inside (opening 76) of the tubular member 62 through the through hole 88.

The space in the vicinity of the through hole 88 formed by the base portion 82 and the first protruding wall portion 84 is configured as a storage portion 90 in which the cooling oil 58 is stored by the centrifugal force caused by the rotation of the rotor 14. In this case, even if the cooling oil 58 does not directly enter the through hole 88, the cooling oil 58 can be temporarily retained in the storage portion 90 and then supplied to the opening 76 through the through hole 88. Further, since the first protruding wall portion 84 protrudes to the vicinity of the side cover 42, when the cooling oil 58 in the first shaft flow path 66 overflows from the shaft opening 68, the centrifugal force caused by the rotation of the rotor 14 Alternatively, the overflowing cooling oil 58 can be supplied to the opening 76 from the inner peripheral side of the first protruding wall portion 84 through the storage portion 90 and the through hole 88 by the action of gravity.

Further, the inlet portion (where the cooling oil 58 is supplied) of the storage portion 90 is provided with an inclination at the base portion 82 and the first protruding wall portion 84 so that the storage portion 90 expands in diameter toward the right. There is. By doing so, it is possible to facilitate the storage of the cooling oil 58 in the storage portion 90 and to reduce the amount of the cooling oil 58 that does not enter the opening 76 through the through hole 88.

Since the planetary gear mechanism 80 is arranged in the opening 76, the cooling oil 58 guided from the through hole 88 through the second protruding wall portion 86 is under the action of centrifugal force caused by the rotation of the rotor 14. Is emitted outward in the radial direction, and a part thereof is also supplied to the planetary gear mechanism 80.

Further, the cooling oil 58 supplied to the opening 76 (cooling oil 58 flowing in through the through hole 88 and cooling oil 58 released through each of the second axial flow paths 70) is under the rotational action of the rotor 14. Moves along the side 74 to cool the rotor core 78. Since the magnet 16 is embedded in the rotor core 78, the cooling oil 58 that has moved along the side portion 74 can cool the magnet 16 via the side portion 74 and the rotor core 78. That is, the heat generated in the magnet 16 due to the rotation of the rotor 14 is dissipated in the path of the rotor core 78, the side portion 74, and the cooling oil 58.

Further, since the cooling oil 58 from the second shaft flow path 70 and the cooling oil 58 from the through hole 88 are supplied to the planetary gear mechanism 80, the sun gear 106 constituting the planetary gear mechanism 80, each planetary gear 108, The ring gear 110, the planetary carrier 114, the bearing 116 and the thrust washer 118 are lubricated and cooled by the cooling oil 58.

Further, when the centrifugal force caused by driving the planetary gear mechanism 80, more specifically, the centrifugal force caused by the rotation of the ring gear 110 causes the cooling oil 58 adhering to the planetary gear mechanism 80 to scatter outward in the radial direction. , The scattered cooling oil 58 may adhere to the side portion 74 constituting the rotor 14. 2 and 4 show how the cooling oil 58 is scattered from the ring gear 110 by a broken line with an arrow.

The cooling oil 58 supplied from the third discharge hole 52 of the side cover 42 cools each part of the stator 32.

Then, in the present embodiment, the cooling oil 58 that has cooled the rotor 14 and the stator 32 and the cooling oil 58 that has lubricated and cooled the planetary gear mechanism 80 fall into the oil pan 98 which is the bottom of the case 40 due to gravity. And be stored. The cooling oil 58 stored in the oil pan 98 is filtered by the strainer 100 by the drive of the pump 56, and then supplied to the side cover 42 via the flow path 102 and the flow path 54. That is, the cooling oil 58 stored in the oil pan 98 is reused for cooling the rotor 14 and the stator 32, and for lubrication and cooling of the transmission 22 by driving the pump 56.

[Magnet temperature estimation]
A guide member 41 for positioning the ring gear 110 of the planetary gear mechanism 80 in a rotatable state is fastened to the case 40 by a fastening member 411. In this embodiment, the fastening member 411 is a bolt.

The fastening member 411 extends axially so that the bolt head 411a is on the left side in the axial direction in the radial direction, and is fastened to the case 40. The fastening member 411 is arranged between the planetary gear mechanism 80 and the rotor 14 of the rotary electric machine 12 in the radial direction.

A temperature detection unit 104 is fixed to the fastening member 411 so as to project from the bolt head 411a toward the opening 76 of the tubular member 62 in the axial direction to the left. The temperature detection unit 104 is, for example, a thermistor. Since the temperature detection unit 104 is fixed to the fastening member 411 fastened to the case 40, the temperature detection unit 104 can be easily and stably fixed to the rotary electric machine unit 10.

The temperature detection unit 104 detects the temperature Tc of the cooling oil 58 moving radially outward from the planetary gear mechanism 80. At least a part of the temperature detection unit 104 is located in the opening 76 of the tubular member 62, and at least a part of the temperature detection unit 104 is arranged in a region where the planetary gear mechanism 80 and the rotor 14 of the rotary electric machine 12 overlap in the axial direction. It is arranged between the planetary gear mechanism 80 and the rotor 14 of the rotary electric machine 12 in the radial direction. Therefore, the temperature detection unit 104 determines the temperature of the cooling oil 58 moving from the planetary gear mechanism 80 to the rotor 14 in the radial direction in the region where the planetary gear mechanism 80 and the rotor 14 of the rotary electric machine 12 overlap in the axial direction. To detect. Then, the temperature detection unit 104 outputs the detected temperature Tc signal to the ECU 120 (see FIG. 1).

Returning to FIG. 1, the ECU 120 includes a magnet temperature calculation unit 121. The ECU 120 calculates the estimated temperature Tm of the magnet 16 of the rotor 14 by the magnet temperature calculation unit 121 based on the temperature Tc of the cooling oil 58 output from the temperature detection unit 104.

As described above, the temperature Tc of the cooling oil 58 detected by the temperature detection unit 104 is the temperature of the cooling oil 58 immediately before being moved outward in the radial direction from the planetary gear mechanism 80 and supplied to the rotor 14. Therefore, the magnet temperature calculation unit 121 determines the estimated temperature of the magnet 16 of the rotor 14 based on the temperature Tc of the cooling oil 58 detected by the temperature detection unit 104, that is, the temperature of the cooling oil 58 immediately before being supplied to the rotor 14. Since Tm is calculated, the temperature of the magnet 16 can be estimated accurately.

Further, the temperature detection unit 104 is arranged in a region where at least a part of the planetary gear mechanism 80 and the rotor 14 overlap in the axial direction, and is arranged between the planetary gear mechanism 80 and the rotor 14 in the radial direction. Therefore, the temperature detection unit 104 can more accurately detect the temperature of the cooling oil 58 immediately before being moved outward in the radial direction from the planetary gear mechanism 80 and supplied to the rotor 14. As a result, the temperature of the magnet 16 can be estimated more accurately.

In the present embodiment, the magnet temperature calculation unit 121 calculates the estimated temperature Tm of the magnet 16 of the rotor 14 based only on the temperature Tc of the cooling oil 58 detected by the temperature detection unit 104.

This makes it possible to simplify the configuration and calculation process of the magnet temperature calculation unit 121. Further, when the temperature of the magnet is estimated based on a large number of parameters, a rounding error occurs in each parameter input to the magnet temperature calculation unit 121, but the rotor 14 is based only on the temperature Tc detected by the temperature detection unit 104. By calculating the estimated temperature Tm of the magnet 16, the error generated in the magnet temperature calculating unit 121 can be reduced, so that the temperature of the magnet 16 can be estimated accurately.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified, improved, and the like.

For example, in the present embodiment, the rotary electric machine 12 is a so-called IPM (Interior Permanent Magnet Motor) type rotary electric machine provided with a magnet-embedded rotor in which a magnet 16 is embedded in the rotor 14, but the rotor An SPM (Surface Permanent Magnet Motor) type rotary electric machine in which a magnet 16 is arranged on the surface of the 14 may be used.

Further, for example, in the present embodiment, the rotary electric machine unit 10 includes a planetary gear mechanism 80 which is a part of the configuration of the transmission 22, but the rotary electric machine unit 10 is not limited to the planetary gear mechanism 80 and includes an arbitrary gear mechanism. May be.

In addition, at least the following matters are described in this specification. The components and the like corresponding to the above-described embodiment are shown in parentheses, but the present invention is not limited to this.

(1) Rotating shaft (rotating shaft 60) and
A rotary electric machine (rotary electric machine) having a substantially annular rotor (rotor 14) that rotates integrally with the rotary shaft, and a stator (stator 32) arranged at predetermined intervals in the radial direction from the outer peripheral surface of the rotor. 12) and
A gear mechanism (planetary gear mechanism 80) assembled to the rotating shaft and arranged inside the rotor in the radial direction is provided.
The rotor has a substantially annular rotor core (rotor core 78) and a magnet (magnet 16) attached to the rotor core.
The gear mechanism is arranged so that at least a part of it overlaps with the rotor in the axial direction.
The rotor is a rotary electric machine unit (rotary electric machine unit 10) cooled by a refrigerant (cooling oil 58) supplied from the gear mechanism.
A temperature detection unit (temperature detection unit 104) that detects the temperature (temperature Tc) of the refrigerant that moves radially outward from the gear mechanism, and
A rotary electric machine unit including a magnet temperature calculation unit (magnet temperature calculation unit 121) that calculates an estimated temperature (estimated temperature Tm) of the magnet based on the temperature detected by the temperature detection unit.

According to (1), the estimated temperature of the rotor magnet is calculated based on the temperature of the refrigerant moving radially outward from the gear mechanism detected by the temperature detection unit, so that the temperature of the rotor magnet is estimated accurately. it can.

(2) The rotary electric machine unit according to (1).
The temperature detection unit is a rotary electric machine unit in which at least a part thereof is arranged in a region where the gear mechanism and the rotor overlap in the axial direction and is arranged between the gear mechanism and the rotor in the radial direction.

According to (2), at least a part of the temperature detection unit is arranged in the region where the gear mechanism and the rotor overlap in the axial direction, and is arranged between the gear mechanism and the rotor in the radial direction. Since the detection unit can more accurately detect the temperature of the refrigerant immediately before being moved radially outward from the gear mechanism and supplied to the rotor, the temperature of the magnet can be estimated more accurately.

(3) The rotary electric machine unit according to (1) or (2).
The rotary electric machine and the gear mechanism are housed in a case (case 40).
The temperature detection unit is a rotary electric machine unit fixed to a fastening member (fastening member 411) fastened to the case.

According to (3), since the temperature detection unit is fixed to the fastening member fastened to the case, the temperature detection unit can be easily and stably fixed to the rotary electric machine unit.

(4) The rotary electric machine unit according to any one of (1) to (3).
The magnet temperature calculation unit is a rotary electric machine unit that calculates the estimated temperature of the magnet based only on the temperature detected by the temperature detection unit.

According to (4), since the magnet temperature calculation unit calculates the estimated temperature of the magnet based only on the temperature detected by the temperature detection unit, the magnet temperature calculation unit can be simplified. Further, since a rounding error occurs in each parameter input to the magnet temperature calculation unit, when the estimated temperature of the magnet is calculated based on a large number of parameters, the error generated in the magnet temperature calculation unit becomes large due to the rounding error of each parameter. By calculating the estimated temperature of the magnet based only on the temperature detected by the temperature detection unit, the error generated in the magnet temperature calculation unit can be reduced, so that the temperature of the magnet can be estimated accurately.

(5) Rotating shaft (rotating shaft 60) and
A rotary electric machine (rotary electric machine) having a substantially annular rotor (rotor 14) that rotates integrally with the rotary shaft, and a stator (stator 32) arranged at predetermined intervals in the radial direction from the outer peripheral surface of the rotor. 12) and
A gear mechanism (planetary gear mechanism 80) assembled to the rotating shaft and arranged inside the rotor in the radial direction is provided.
The rotor has a substantially annular rotor core (rotor core 78) and a magnet (magnet 16) attached to the rotor core.
The gear mechanism is arranged so that at least a part of it overlaps with the rotor in the axial direction.
The rotor is a magnet temperature estimation method for estimating the temperature of the magnet in the rotary electric machine unit (rotary electric machine unit 10), which is cooled by the refrigerant (cooling oil 58) supplied from the gear mechanism.
A refrigerant temperature detection step of detecting the temperature of the refrigerant moving radially outward from the gear mechanism, and
A magnet temperature estimation method including a magnet temperature calculation step of calculating an estimated temperature of the magnet based on the temperature detected in the refrigerant temperature detecting step.

According to (5), the magnet temperature estimation method is a magnet assembled to the rotor core of the rotor based on the temperature of the refrigerant moving radially outward from the gear mechanism by the refrigerant temperature detection step and the magnet temperature calculation step. Since the estimated temperature of the rotor is calculated, the temperature of the magnet of the rotor can be estimated accurately.

(6) The magnet temperature estimation method according to (5).
The gear mechanism is arranged so that at least a part of it overlaps with the rotor in the axial direction.
In the refrigerant temperature detection step, a magnet temperature estimation method for detecting the temperature of the refrigerant moving from the gear mechanism to the rotor in the radial direction in a region where the gear mechanism and the rotor overlap in the axial direction.

According to (6), in the refrigerant temperature detection step, the gear mechanism is detected by detecting the temperature of the refrigerant moving from the gear mechanism to the rotor in the radial direction in the region where the gear mechanism and the rotor overlap in the axial direction. Since the temperature of the refrigerant immediately before being supplied to the rotor by moving outward in the radial direction can be detected more accurately, the temperature of the magnet can be estimated more accurately.

(7) The magnet temperature estimation method according to (5) or (6).
In the magnet temperature calculation step, a magnet temperature estimation method for calculating the estimated temperature of the magnet based only on the temperature detected in the refrigerant temperature detection step.

According to (7), since the magnet temperature calculation step calculates the estimated temperature of the magnet based only on the temperature detected by the refrigerant temperature detection step, the magnet temperature calculation step can be simplified. Further, since each parameter used in the magnet temperature calculation process has a rounding error, when the estimated temperature of the magnet is calculated based on a large number of parameters, the error caused in the magnet temperature calculation process becomes large due to the rounding error of each parameter, but the refrigerant By calculating the estimated temperature of the magnet based only on the temperature detected in the temperature detection step, the error generated in the magnet temperature calculation step can be reduced, so that the temperature of the magnet can be estimated accurately.

10 Rotating machine unit 12 Rotating machine 14 Rotor 16 Magnet 32 Stator 40 Case 58 Cooling oil (refrigerant)
60 Rotating shaft 78 Rotor core 80 Planetary gear mechanism (gear mechanism)
104 Temperature detection unit 121 Magnet temperature calculation unit 411 Fastening member Tc temperature Tm Estimated temperature

Claims (7)

Rotating shaft and
A rotary electric machine having a substantially ring-shaped rotor that rotates integrally with the rotary shaft, and a stator arranged at predetermined intervals in the radial direction from the outer peripheral surface of the rotor.
A gear mechanism assembled on the rotating shaft and arranged radially inside the rotor.
The rotor has a substantially annular rotor core and a magnet attached to the rotor core.
The gear mechanism is arranged so that at least a part of it overlaps with the rotor in the axial direction.
The rotor is a rotary electric machine unit cooled by a refrigerant supplied from the gear mechanism.
A temperature detection unit that detects the temperature of the refrigerant moving radially outward from the gear mechanism, and
A rotary electric machine unit including a magnet temperature calculation unit that calculates an estimated temperature of the magnet based on the temperature detected by the temperature detection unit. The rotary electric machine unit according to claim 1.
The temperature detection unit is a rotary electric machine unit in which at least a part thereof is arranged in a region where the gear mechanism and the rotor overlap in the axial direction and is arranged between the gear mechanism and the rotor in the radial direction. The rotary electric machine unit according to claim 1 or 2.
The rotary electric machine and the gear mechanism are housed in a case.
The temperature detection unit is a rotary electric machine unit fixed to a fastening member fastened to the case. The rotary electric machine unit according to any one of claims 1 to 3.
The magnet temperature calculation unit is a rotary electric machine unit that calculates the estimated temperature of the magnet based only on the temperature detected by the temperature detection unit. Rotating shaft and
A rotor having a substantially annular shape that rotates integrally with the rotary shaft, and a rotary electric machine having a stator arranged at a predetermined distance from the outer peripheral surface of the rotor.
A gear mechanism assembled on the rotating shaft and arranged radially inside the rotor.
The rotor has a substantially annular rotor core and a magnet attached to the rotor core.
The rotor is a magnet temperature estimation method for estimating the temperature of the magnet in a rotary electric machine unit, which is cooled by a refrigerant supplied from the gear mechanism.
A refrigerant temperature detection step of detecting the temperature of the refrigerant moving radially outward from the gear mechanism, and
A magnet temperature estimation method including a magnet temperature calculation step of calculating an estimated temperature of the magnet based on the temperature detected in the refrigerant temperature detecting step. The magnet temperature estimation method according to claim 5.
The gear mechanism is arranged so that at least a part of it overlaps with the rotor in the axial direction.
In the refrigerant temperature detection step, a magnet temperature estimation method for detecting the temperature of the refrigerant moving from the gear mechanism to the rotor in the radial direction in a region where the gear mechanism and the rotor overlap in the axial direction. The magnet temperature estimation method according to claim 5 or 6.
In the magnet temperature calculation step, a magnet temperature estimation method for calculating the estimated temperature of the magnet based only on the temperature detected in the refrigerant temperature detection step.

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