JP6983290B1 - Rotating machine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a rotary electric machine capable of accurately correcting an estimated value of a coil temperature by a detection value of a coil temperature by a temperature sensor. SOLUTION: A coil temperature Tmpd is detected based on an output signal of a temperature sensor, a coil temperature Tmpe is estimated based on an operating state of a rotary electric machine, a rotation speed of the rotary electric machine is equal to or less than a speed threshold, and rotation is performed. A rotary electric machine control device that corrects the estimated value Tmpe of the coil temperature based on the detected value Tmpd of the coil temperature when the low speed and low load state in which the torque of the electric machine is equal to or less than the torque threshold continues for the determination period. [Selection diagram] FIG. 9

Description

The present application relates to a control device for a rotary electric machine.

The rotary electric machine has a stator having a stator core around which a coil is wound, and a rotor arranged radially inside the stator. The rotary electric machine functions as an electric motor or a generator by passing an electric current through the coil. When a current flows through the coil, the coil, stator core, and the like generate heat. If the temperature of the coil rises due to this heat generation, the coil may fail.

A temperature sensor is attached to the coil to detect the temperature of the coil and protect the rotating electric machine from overheating. When the amount of heat generated by the coil is large and the temperature rises sharply, the temperature detected by the temperature sensor may not be able to follow the actual coil temperature of the coil portion to be estimated.

Patent Document 1 discloses a technique of calculating the calorific value of a coil from the current flowing through the coil, calculating the amount of heat dissipated from the coil, and estimating the coil temperature.

Japanese Unexamined Patent Publication No. 2008-187858

However, when the rotating speed of the rotary electric machine and the operating point of the torque are repeatedly changed, an error in the amount of heat generated and an error in the amount of heat radiation are accumulated, and there is a problem that the estimation error of the coil temperature becomes large. On the other hand, when trying to correct the estimated temperature by the temperature detected by the temperature sensor, the temperature difference between the detected temperature and the actual coil temperature of the estimated part becomes large under the condition that the calorific value of the coil is large, and the estimated temperature is calculated by the detected temperature. When corrected, there was a problem that the estimation error became larger.

Therefore, it is an object of the present application to provide a control device for a rotary electric machine capable of accurately correcting an estimated value of a coil temperature by a value detected by a temperature sensor.

The control device for the rotary electric machine according to the present application is
A temperature detector that detects the temperature based on the output signal of the temperature sensor that detects the temperature of the coil provided in the stator of the rotary electric machine.
A temperature estimation unit that estimates the temperature of the coil based on the operating state of the rotary electric machine,
When the low speed and low load state in which the rotation speed of the rotary electric machine is equal to or less than the speed threshold and the torque of the rotary electric machine is equal to or less than the torque threshold value continues during the determination period, the temperature is based on the detected value of the temperature. It is provided with a temperature correction unit that corrects the estimated value of the temperature estimated by the estimation unit.

According to the control device of the rotary electric machine of the present application, the energization current of the coil becomes small and the calorific value of the coil becomes small in the low speed and low load state. If this low speed and low load state continues during the judgment period, the temperature difference between the temperature estimation part and the temperature detection part becomes small, so in this state, the temperature estimation value is corrected based on the temperature detection value. Thereby, the correction accuracy can be improved.

It is a schematic block diagram of the rotary electric machine and the control device of the rotary electric machine which concerns on Embodiment 1. FIG. It is a schematic sectional drawing of the rotary electric machine which concerns on Embodiment 1. FIG. It is a schematic circuit diagram of the inverter which concerns on Embodiment 1. FIG. It is a schematic block diagram of the control device of the rotary electric machine which concerns on Embodiment 1. FIG. It is a schematic hardware block diagram of the control device of the rotary electric machine which concerns on Embodiment 1. FIG. It is a figure explaining the region of the low speed low load state which concerns on Embodiment 1. FIG. It is a time chart explaining the change of each coil temperature at the operating point a where the torque is large which concerns on Embodiment 1. FIG. It is a time chart explaining the change of each coil temperature at the operating point b where the torque is small which concerns on Embodiment 1. FIG. It is a time chart explaining the process of the temperature correction part which concerns on Embodiment 1. FIG. It is a figure explaining the torque reduction rate data which concerns on Embodiment 1. It is a figure explaining the offset temperature data which concerns on Embodiment 2. It is a time chart explaining the processing of the temperature correction part which concerns on Embodiment 2. It is a time chart explaining the processing of the temperature correction part which concerns on Embodiment 3. It is a figure explaining the temperature prediction data of the temperature estimation part which concerns on Embodiment 5. It is a block diagram of the temperature estimation part which concerns on Embodiment 5.

1. 1. Embodiment 1
Hereinafter, the control device 30 (hereinafter, simply referred to as the control device 30) of the rotary electric machine according to the first embodiment will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a rotary electric machine 1, an inverter 4, a control device 30, and the like.

1-1. Rotating electric machine 1
FIG. 2 shows a cross-sectional view of the rotary electric machine 1 cut along a plane passing through the center of rotation. The rotary electric machine 1 has a cylindrical stator 100 and a cylindrical rotor 200 arranged radially inside the stator 100 and rotatably supported by bearings 204 and 205. In the present embodiment, the rotary electric machine 1 is a permanent magnet synchronous motor, the stator 100 is wound with a coil 102, and the rotor 200 is provided with a permanent magnet 202. The rotary electric machine 1 may be a field coil type synchronous motor provided with a field coil on the rotor. Alternatively, the rotary electric machine 1 may be an induction motor in which a cage-shaped electric conductor is provided in the rotor.

The stator 100 includes a stator core 101 in which an annular plate-shaped electromagnetic steel plate is laminated in the axial direction, and a coil 102 wound around each tooth of the stator core 101. A plurality of teeth are provided at equal intervals in the circumferential direction. The coil 102 has a coil portion 104 (coil portion 104 in the core) arranged in the stator core 101 (inside the slot), and a coil end portion 103 protruding from the stator core 101 on both sides in the axial direction. There is. As the coil 102, a multi-phase coil (in this example, three-phase coils Cu, Cv, and Cw of U phase, V phase, and W phase) is provided, and the end of the coil of each phase is attached to the inverter 4. It is connected. A plurality of sets (for example, two sets) of three-phase coils may be provided.

A temperature sensor 110 for detecting the temperature of the coil is provided. In the present embodiment, the temperature sensor 110 is attached to the coil end portion 103 on one side in the axial direction and detects the temperature of the coil end portion 103. The output signal of the temperature sensor 110 is input to the control device 30.

The rotor 200 is provided on a rotor core 201 in which an annular plate-shaped electromagnetic steel plate is vertically laminated, a permanent magnet 202 mounted in each slot of the rotor core 201, and an inner peripheral surface of the rotor core 201. It is provided with a fixed rotation shaft 203. The permanent magnet 202 may be fixed to the outer peripheral surface of the rotor core 201.

The stator 100 and rotor 200 are housed in a housing. The housing includes a bottomed cylindrical first housing 300 with a deep bottom and a shallow bottomed cylindrical second housing 301 that closes the opening of the first housing 300. A stator 100 (stator core 101) is fixed to the inner peripheral surface of the peripheral wall of the first housing 300. The bottom wall of the first housing 300 and the bottom wall of the second housing 301 are provided with through holes through which the rotation shaft 203 penetrates, and the inner peripheral surface of the through holes in the bottom wall of the first housing 300 is the first. One side of the rotating shaft 203 in the axial direction is rotatably supported via the bearing 204, and the inner peripheral surface of the through hole in the bottom wall of the second housing 301 is formed on the rotating shaft 203 via the second bearing 205. It rotatably supports the other side in the axial direction.

Various cooling mechanisms are used for the cooling mechanism of the rotary electric machine 1, for example, an oil-cooled type in which cooling oil is supplied into the housing to cool the stator and the rotor, and the housing and the stator are cooled by the cooling water. It is a water-cooled type, or an air-cooled type in which the stator and rotary type are cooled by cooling air.

The rotation shaft 203 is provided with a rotation sensor 2 for detecting the rotation angle of the rotor 200. A resolver, an encoder, an MR sensor, or the like is used for the rotation sensor 2. The output signal of the rotation sensor 2 is input to the control device 30.

1-2. Inverter 4
As shown in FIG. 3, in the inverter 4, the switching element SP on the positive electrode side connected to the positive electrode side of the DC power supply 3 and the switching element SN on the negative electrode side connected to the negative electrode side of the DC power supply 3 are connected in series. Three sets of series circuits (legs) are provided corresponding to each of the three phases. Then, the connection points of the two switching elements in the series circuit of each phase are connected to the coils of the corresponding phases.

Specifically, in the U-phase series circuit, the switching element SPu on the positive electrode side of the U phase and the switching element SNu on the negative electrode side of the U phase are connected in series, and the connection point of the two switching elements is the coil Cu of the U phase. It is connected to the. In the V-phase series circuit, the switching element SPv on the positive electrode side of the V phase and the switching element SNv on the negative electrode side of the V phase are connected in series, and the connection points of the two switching elements are connected to the coil Cv of the V phase. .. In the W-phase series circuit, the switching element SPw on the positive electrode side of W and the switching element SNw on the negative electrode side of W phase are connected in series, and the connection points of the two switching elements are connected to the coil Cw of W phase. The smoothing capacitor 7 is connected between the positive electrode side and the negative electrode side of the DC power supply 3.

FETs (Field Effect Transistors) with diodes connected in anti-parallel, IGBTs (Insulated Gate Bipolar Transistors) with diodes connected in anti-parallel, MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), and diodes are connected in anti-parallel to the switching elements. Bipolar transistors and the like are used. The gate terminal of each switching element is connected to the control device 30 via a gate drive circuit or the like. Each switching element is turned on or off by a switching signal output from the control device 30.

The DC power supply 3 outputs a DC voltage Vdc to the inverter 4. The DC power supply 3 may be any device as long as it is a device that outputs a DC voltage such as a battery, a DC-DC converter, a diode rectifier, and a PWM rectifier. The DC power supply 3 is provided with a voltage sensor 6 for detecting the DC voltage Vdc of the DC power supply 3, and the output signal of the voltage sensor 6 is input to the control device 30.

A current sensor 5 for detecting the current flowing through the coils of each phase is provided. The current sensor 5 is provided on the electric wire connecting the series circuit of the two switching elements of each phase and the coil of each phase. The output signal of the current sensor 5 is input to the control device 30. The current sensor 5 may be provided in a series circuit of two switching elements of each phase.

1-3. Control device 30
The control device 30 controls the rotary electric machine 1 via the inverter 4. As shown in FIG. 4, the control device 30 includes an operating state detection unit 31, a torque control unit 32, a temperature detection unit 33, a temperature estimation unit 34, a temperature correction unit 35, an output limiting unit 36, and the like. Each function of the control device 30 is realized by a processing circuit provided in the control device 30. Specifically, as shown in FIG. 5, the control device 30 includes an arithmetic processing unit 90 (computer) such as a CPU (Central Processing Unit), a storage device 91 for exchanging data with the arithmetic processing unit 90, as a processing circuit. The arithmetic processing unit 90 includes an input circuit 92 for inputting an external signal, an output circuit 93 for outputting a signal from the arithmetic processing unit 90 to the outside, and the like.

The arithmetic processing device 90 is provided with an ASIC (Application Specific Integrated Circuit), an IC (Integrated Circuit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), various logic circuits, various signal processing circuits, and the like. You may. Further, as the arithmetic processing unit 90, a plurality of the same type or different types may be provided, and each processing may be shared and executed. The storage device 91 includes a RAM (Random Access Memory) configured to be able to read and write data from the arithmetic processing unit 90, a ROM (Read Only Memory) configured to be able to read data from the arithmetic processing unit 90, and the like. Has been done. The input circuit 92 is connected to various sensors and switches such as a rotation sensor 2, a current sensor 5, a voltage sensor 6, and a temperature sensor 110, and A / D conversion in which the output signals of these sensors and switches are input to the arithmetic processing device 90. Equipped with vessels, etc. The output circuit 93 is provided with a drive circuit or the like to which an electric load such as a gate drive circuit for driving the switching element on and off is connected and a control signal is output from the arithmetic processing device 90 to these electric loads.

Then, in each function of the control units 31 to 36 of FIG. 4 included in the control device 30, the arithmetic processing unit 90 executes software (program) stored in the storage device 91 such as a ROM, and the storage device 91, It is realized by cooperating with other hardware of the control device 30 such as the input circuit 92 and the output circuit 93. The setting data such as the speed threshold value N1, the torque threshold value Tq1, the determination period Tth, and the determination counter value Cth used by the control units 31 to 36 and the like are stored in the storage device 91 such as ROM as a part of the software (program). It is remembered. Hereinafter, each function of the control device 30 will be described in detail.

1-3-1. Operating state detection unit 31
The operating state detection unit 31 detects the magnetic pole position θ (rotor rotation angle θ) of the rotor and the rotation angular velocity ω at the electric angle. In the present embodiment, the operating state detection unit 31 detects the rotation angle θ (magnetic pole position θ) and the rotation angular velocity ω of the rotor based on the output signal of the rotation sensor 2. The magnetic pole position θ (rotation angle θ) is set in the direction of the N pole of the permanent magnet provided in the rotor. The operating state detection unit 31 calculates the rotation speed N [rpm] at the mechanical angle by multiplying the rotation angular velocity ω [rad / s] at the electric angle by a predetermined conversion constant. The operating state detection unit 31 is configured to estimate the rotation angle (pole position) based on the current information obtained by superimposing the harmonic component on the current command value without using the rotation sensor. It may be (so-called sensorless method).

The operating state detection unit 31 detects the currents Iur, Ivr, and Iwr flowing through the coils of each of the three phases based on the output signal of the current sensor 5. The operating state detection unit 31 detects the DC voltage Vdc supplied to the inverter 4 based on the output signal of the voltage sensor 6.

1-3-2. Torque control unit 32
The torque control unit 32 controls the applied voltage applied to the three-phase coil of the rotary electric machine 1 to control the torque of the rotary electric machine 1. In the present embodiment, the torque control unit 32 includes a current command value calculation unit 321, a voltage command value calculation unit 322, and a switching control unit 323.

The current command value calculation unit 321 calculates the current command value based on the torque command value To, the rotation speed N, and the DC voltage Vdc. In the present embodiment, the current command value calculation unit 321 calculates the current command value Ido on the d-axis and the current command value Iqo on the q-axis. The d-axis is set in the direction of the magnetic poles (N pole, magnetic pole position θ) of the rotor, and the q-axis is set in the direction advanced by 90 ° in electrical angle from the d-axis. The rotating coordinate system of the dq axis rotates in synchronization with the rotation of the magnetic pole position θ of the rotor. In the present embodiment, as the torque command value To, the value after processing by the output limiting unit 36, which will be described later, is used.

The current command value calculation unit 321 calculates the current command values Ido and Iqo of the d-axis and the q-axis according to known vector control methods such as maximum torque current control, field weakening control, and Id = 0 control. The torque command value To may be calculated inside the control device 30 or may be transmitted from the outside of the control device 30.

The voltage command value calculation unit 322 calculates the three-phase voltage command values Vuo, Vvo, and Vwo based on the current command value. In the present embodiment, the voltage command value calculation unit 322 describes the d-axis and the q-axis so that the current detection values Idr and Iqr of the d-axis and the q-axis approach the current command values Ido and Iqo of the d-axis and the q-axis. Current feedback control is performed to change the voltage command values Vdo and Vqo of.

The voltage command value calculation unit 322 performs three-phase two-phase conversion and rotational coordinate conversion on the current detection values Iur, Ivr, and Iwr of the three-phase coil based on the magnetic pole position θ, and the current detection values Idr and q of the d-axis. Convert to the current detection value Iqr of the shaft.

Then, the voltage command value calculation unit 322 performs fixed coordinate conversion and two-phase three-phase conversion on the d-axis and q-axis voltage command values Vdo and Vqo based on the magnetic pole position θ, and performs three-phase voltage command values. Convert to Vuo, Vvo, Vwo.

The switching control unit 323 applies a voltage to the three-phase coil by controlling the switching element of the inverter 4 on and off by PWM control (Pulse Width Modulation) based on the three-phase voltage command values Vuo, Vvo, and Vwo. Apply. The switching control unit 323 controls on / off of a plurality of switching elements by comparing each of the three-phase voltage command values Vuo, Vvo, and Vwo with the carrier wave. The carrier wave is a triangular wave that vibrates with an amplitude of DC voltage Vdc in a PWM cycle.

1-3-3. Temperature detector 33
The temperature detection unit 33 detects the coil temperature Tmpd (hereinafter referred to as the detection temperature Tmpd) based on the output signal of the temperature sensor 110. In the present embodiment, the temperature sensor 110 is attached to the coil end portion 103, and the detected temperature Tmpd is the temperature of the coil end portion 103. The coil end portion 103 is exposed to the outside from the stator core, and is easily cooled by a refrigerant (otherwise, oil or air).

On the other hand, the temperature estimation portion, which is the portion of the coil whose coil temperature is estimated by the temperature estimation unit 34 described later, is set to the coil portion where the temperature is difficult to be cooled by the cooling mechanism and the temperature becomes high. In the present embodiment, the temperature estimation portion is set to the coil portion 104 in the core (for example, the central portion in the axial direction) arranged in the stator core.

The mounting location of the temperature sensor 110 and the temperature estimation portion may be changed depending on the configuration of the cooling mechanism and the structure of the rotary electric machine.

1-3-4. Temperature estimation unit 34
The temperature estimation unit 34 estimates the coil temperature Tmpe (hereinafter referred to as the estimated temperature Tmpe) based on the operating state of the rotary electric machine. Various known methods can be used as the method for estimating the coil temperature, but in the present embodiment, the following simple example is shown.

As shown in the following equation, the temperature estimation unit 34 adds the temperature rise amount ΔTup of the coil due to the heat generation of the coil to the estimated temperature Tmpe (n-1) calculated in the previous calculation cycle, and heats the coil to dissipate heat. The value obtained by subtracting the temperature decrease amount ΔTdwn is calculated as the estimated temperature Tmpe (n) of the current calculation cycle.
Tmpe (n) = Tmpe (n-1) + ΔTup (n) -ΔTdwn (n)
ΔTup (n) = K1 × I (n) ²
ΔTdwn (n) = K2 × {Tmpe (n-1) -Tnbr} ... (1)

Here, I (n) represents the current value flowing through the coil and is calculated based on the current detection value or the current command value. K1 is a heat generation coefficient according to the resistance of the coil. Tnbr is the temperature of the peripheral member to which the heat of the coil is transferred, for example a simplified standard temperature of the refrigerant is set. K2 is a heat dissipation coefficient according to the thermal conductivity between the coil and the peripheral member. (N-1) indicates that it is the calculated value of the previous calculation cycle, and (n) indicates that it is the calculated value of the current calculation cycle.

As in Patent Document 1, the estimated temperature Tmpe may be calculated using a more complicated arithmetic expression.

1-3-5. Temperature correction unit 35
<Issues of temperature correction>
The estimated temperature Tmpe deviates from the actual temperature Tmpr of the temperature estimation part due to error factors such as the estimation error of the temperature estimation process, the state of the refrigerant of the cooling mechanism (temperature, flow rate), the surrounding environment of the rotating electric machine, and the secular change of the rotating electric machine. In some cases. When a deviation occurs, it is desirable to correct the estimated temperature Tmpe by the detected temperature Tmpd. However, since the temperature detection portion and the temperature estimation portion are different, a temperature difference occurs between the detection temperature Tmpd of the temperature detection portion and the actual temperature Tmpr of the temperature estimation portion, and the temperature difference changes depending on the operating state of the rotary electric machine. Therefore, if the estimated temperature Tmpe is not corrected by the detected temperature Tmpd in consideration of the operating state of the rotary electric machine, the estimated temperature Tmpe may deviate from the actual temperature Tmpr due to the correction.

FIG. 6 shows an operating region of a rotary electric machine in which the horizontal axis is the rotation speed N and the vertical axis is the torque T. FIG. 6 shows the maximum torque Tmax that can be output by the rotary electric machine at each rotation speed N. At each rotation speed N, the range of the maximum torque Tmax or less is the operating region of the rotary electric machine. FIG. 6 shows a region in a low speed and low load state, which will be described later.

FIG. 7 shows an example of transient temperature rise behavior of the estimated temperature Tmpe, the actual temperature Tmpr of the temperature estimation portion, and the detected temperature Tmpd at the operating point a where the torque T is larger than that in the region of the low speed and low load state of FIG. Is shown. The actual temperature Tmpr is measured by a temperature sensor provided for the experiment or obtained by analysis. FIG. 8 shows an example of the transient temperature rise behavior of the estimated temperature Tmpe, the actual temperature Tmpr of the temperature estimation portion, and the detected temperature Tmpd at the operating point b in the region of the low speed and low load state of FIG.

At the operating point a, since the torque T is large, the energizing current of the coil is large and the calorific value of the coil is large. Therefore, the temperature rise of the estimated temperature Tmpe and the actual temperature Tmpr of the temperature estimation portion set in the coil portion where the temperature is relatively high is steep, and it is difficult to be cooled by the cooling mechanism. On the other hand, since the temperature detection portion is a coil portion that is easily cooled by the cooling mechanism, the temperature rise of the detection temperature Tmpd is slower than that of the estimated temperature Tmpe and the actual temperature Tmpr, and the estimated temperature Tmpe and the actual temperature Tmpr become the same. On the other hand, the deviation of the detected temperature Tmpd is large. That is, at the operating point a where the calorific value of the coil is large, the temperature gradient between the temperature estimation portion that is difficult to be cooled by the cooling mechanism and the temperature detection portion that is easily cooled by the cooling mechanism is large.

On the other hand, at the operating point b, since the torque T is small, the energizing current is small and the calorific value of the coil is small. Therefore, the temperature rise of the estimated temperature Tmpe and the actual temperature Tmpr of the temperature estimation portion is gradual, and the temperature rise of the detected temperature Tmpd is also gradual. Therefore, the deviation of the detected temperature Tmpd from the estimated temperature Tmpe and the actual temperature Tmpr is small. That is, at the operating point b where the calorific value of the coil is small, the temperature gradient between the temperature estimation portion that is difficult to be cooled by the cooling mechanism and the temperature detection portion that is easily cooled by the cooling mechanism is small.

Therefore, in the steady state at the operating point where the calorific value of the coil is small, the temperature difference between the temperature estimation part and the temperature detection part becomes small. Can be improved.

<Temperature correction under low speed and low load>
Therefore, the temperature correction unit 35 sets the detection temperature Tmpd when the low-speed low-load state in which the rotation speed N is the speed threshold N1 or less and the torque is the torque threshold Tq1 or less continues for the determination period Tth. Based on this, the estimated temperature Tmp estimated by the temperature estimation unit 34 is corrected.

In the low speed and low load state, the energizing current of the coil becomes small, and the calorific value of the coil becomes small. If this low-speed, low-load state continues for the determination period Tth, the temperature difference between the temperature estimation part and the temperature detection part becomes small. The accuracy can be improved.

For example, the low speed low load state is set as shown in FIG. That is, in the region where the rotation speed N is the speed threshold value N1 or less, the torque T is the torque threshold value Tq1 or less, and the output P of the rotary electric machine is the output threshold value P1 or less, the low speed low load state is generated. Set. There may be no condition for output P. The output P is calculated by multiplying the rotation speed N and the torque T. In such a low speed and low load state, the calorific value of the coil of the rotary electric machine is relatively small, and the difference between the estimated temperature Tmpe and the detected temperature Tmpd is small. As the torque T, the torque command value To may be used, or the actual torque value calculated based on the dq-axis current detection value and the rotation speed N using a known torque calculation formula may be used.

In the present embodiment, when the temperature correction unit 35 corrects the estimated temperature Tmpe based on the detected temperature Tmpd, the temperature correction unit 35 corrects the estimated temperature Tmpe to the detected temperature Tmpd as shown in the following equation.
Tmpe (n) = Tmpd ... (2)

<Allow temperature correction by temperature fluctuation range>
Even if the low-speed low-load state continues for the determination period Tth, some factor (for example, the state before the low-speed low-load state, the change in the refrigerant temperature, the change in the operating point in the low-speed low-load state). Therefore, the temperature may not be sufficiently stable.

Therefore, in the present embodiment, the temperature correction unit 35 continues the low speed and low load state during the determination period Tth, the fluctuation range of the detection temperature Tmpd is equal to or less than the determination width ΔTmpd, and the estimated temperature Tmpe. When the fluctuation range of the above is equal to or less than the determination width ΔTmpe, the estimated temperature Tmpe is corrected based on the detected temperature Tmpd.

According to this configuration, the temperature can be corrected while the temperature is surely stable, and the correction accuracy can be improved.

<Judgment by counter value>
In the present embodiment, the counter function of the control device 30 is used to determine whether or not to perform temperature correction. The temperature correction unit 35 counts up the counter value Cnt for measuring the elapsed time in the low speed low load state, resets the counter value Cnt to 0 in the case of not in the low speed low load state, and counter value Cnt. Is configured to modify the estimated temperature Tmpe based on the detected temperature Tmpd when the determination counter value Cth corresponding to the determination period Tth is reached.

According to this configuration, it is possible to determine whether or not to perform temperature correction by using the counter function of the control device 30.

Further, the temperature correction unit 35 sets the detection temperature Tmpd at the time when the counter value Cnt starts counting up from 0 as the reference detection value Tmpd0, and after the counter value Cnt starts counting up from 0, the detection temperature Tmpd changes. , When the determination range set based on the reference detection value Tmpd0 is deviated, the counter value Cnt is reset to 0. Further, the temperature correction unit 35 sets the estimated temperature Tmpe at the time when the counter value Cnt starts counting up from 0 as the reference estimated value Tmpe0, and after the counter value Cnt starts counting up from 0, the estimated temperature Tmpe is set. , The counter value Cnt is reset to 0 when the determination range set based on the reference estimated value Temperature0 is deviated.

According to this configuration, it is possible to determine whether the detected temperature Tmpd and the estimated temperature Tmpe are stable by using the counter function, and both the detected temperature Tmpd and the estimated temperature Tmpe have the determination period Tth in the low speed and low load state. During the period, if the determination range is stable, the temperature can be corrected and the correction accuracy can be improved.

<Control behavior>
FIG. 9 shows an example of control behavior. In FIG. 9, the description of the reset process of the counter value Cnt due to the fluctuation of the estimated temperature Tmpe will be omitted. Before the time t01, the torque T is higher than that in the low speed and low load state, the calorific value of the coil is large, and the detected temperature Tmpd and the estimated temperature Tmpe are high. The torque is decreasing, and at time t01, the vehicle is in a low speed and low load state.

At time t01, the temperature correction unit 35 determines that the low speed and low load state has been reached, starts counting up the counter value Cnt from 0, and sets the detection temperature Tmpd at that time as the reference detection value Tmpd0. .. Then, the temperature correction unit 35 sets the value obtained by adding the determination width ΔTmpd to the reference detection value Tmpd0 as the upper limit value Tmpmax of the determination range, and sets the value obtained by subtracting the determination width ΔTmpd from the reference detection value Tmpd0 as the lower limit value of the determination range. Set as Tmpmin. Although not shown, the determination range is similarly set for the estimated temperature Tmpe, and the fluctuation of the estimated temperature Tmpe is determined.

Even after the low speed and low load state, the detected temperature Tmpd and the estimated temperature Tmp do not decrease immediately due to the response delay due to the heat capacity and heat dissipation, but decrease with a delay. In the example of FIG. 9, since the calorific value of the coil before the low speed and low load state was large and the detection temperature Tmpd and the estimated temperature Tmpe were high, the detection temperature Tmpd decreased even after the low speed and low load state. At time t02, the detected temperature Tmpd fell below the lower limit value Tmpmin of the determination range. Therefore, the temperature correction unit 35 determined that the detected temperature Tmpd deviated from the determination range, and reset the counter value Cnt to 0. There is. As described above, when the temperature change is large, the counter value is reset to 0, the temperature is not corrected, and the deterioration of the correction accuracy can be suppressed.

After resetting at time t02, the temperature correction unit 35 starts counting up the counter value Cnt from 0 because it is in a low speed and low load state, and sets the detection temperature Tmpd at that time as the reference detection value Tmpd0. , The upper limit value Tmpmax and the lower limit value Tmpmin of the determination range are set with reference to the reference detection value Tmpd0.

Since the low speed and low load state was lost due to the increase in torque between the time t03 and the time t04, the temperature correction unit 35 resets the counter value Cnt to 0. Then, at time t04, the low speed and low load state was reached again due to the decrease in torque. Therefore, since the temperature correction unit 35 is in the low speed and low load state, the counter value Cnt is started to be counted up from 0, and the counter value Cnt is started to be counted up. The detection temperature Tmpd at that time is set as the reference detection value Tmpd0, and the upper limit value Tmpmax and the lower limit value Tmpmin of the determination range are set based on the reference detection value Tmpd0.

Since the temperature change of the detected temperature Tmpd is small after the time t04, the detected temperature Tmpd is within the determination range, and the counter value Cnt is not reset to 0. At time t05, the temperature correction unit 35 determines that the condition for temperature correction is satisfied because the counter value Cnt reaches the determination counter value Cth and the determination period Tth has elapsed, and the estimated temperature is estimated based on the detected temperature Tmpd. I am fixing the temperature. As described above, when the temperature change is small, the counter value is not reset to 0, and the temperature is corrected with high accuracy while the temperature is stable.

After the temperature correction, the temperature correction unit 35 resets the counter value Cnt to 0 and starts the count-up again. Since the low speed and low load state has disappeared due to the increase in torque after the time t06, the temperature correction unit 35 resets the counter value Cnt to 0.

1-3-6. Output limiting unit 36
The output limiting unit 36 limits the output of the rotary electric machine when the estimated temperature Tmpe exceeds the threshold temperature Tmpa. For example, the output limiting unit 36 refers to the torque reduction rate data in which the relationship between the estimated temperature Tmpe and the torque reduction rate Tdcr as shown in FIG. 10 is set in advance, and the torque reduction rate Tdcr corresponding to the current estimated temperature Tmpe. Is calculated. As shown in FIG. 10, when the estimated temperature Tmpe is equal to or lower than the threshold temperature Tmpa, the torque reduction rate Tdcr is set to 100%, and as the estimated temperature Tmpe becomes larger than the threshold temperature Tmpa, the torque reduction rate Tdcr Gradually decreases from 100%. Alternatively, the output limiting unit 36 gradually reduces the torque reduction rate Tdcr when the estimated temperature Tmpe exceeds the threshold temperature Tmpa, and sets the torque reduction rate Tdcr when the estimated temperature Tmpe is below the threshold temperature Tmpa. Feedback control that gradually increases may be performed.

The output limiting unit 36 sets the final torque command value To by multiplying the torque command value To by the torque reduction rate Tdcr. By limiting the output, it is possible to suppress the coil temperature of the rotary electric machine from rising too much, and to suppress a failure due to the temperature rise.

2. 2. Embodiment 2
The control device 30 according to the second embodiment will be described. The description of the same components as those in the first embodiment will be omitted. The basic configuration of the rotary electric machine 1 and the control device 30 according to the present embodiment is the same as that of the first embodiment, but the method of modifying the estimated temperature Tmpe based on the detected temperature Tmpd is different from that of the first embodiment.

In the present embodiment, when the temperature correction unit 35 corrects the estimated temperature Tmpe based on the detected temperature Tmpd, the estimated temperature Tmpe is added to the detected temperature Tmpd by the offset temperature ΔToff as shown in the following equation. Correct to.
Tmpe (n) = Tmpd + ΔToff ... (3)

According to this configuration, the accuracy of temperature correction can be improved by setting the temperature difference between the temperature estimation portion and the temperature detection portion to the offset temperature ΔToff in the steady state of the low speed and low load state.

The offset temperature ΔToff is set in advance corresponding to the temperature difference that occurs between the temperature of the temperature estimation portion and the temperature of the temperature sensor mounting location (temperature detection portion) in the steady state in the low speed and low load state. ing.

The temperature correction unit 35 refers to the offset temperature data in which the relationship between the rotation speed N and the offset temperature ΔToff is set in advance, and calculates the offset temperature ΔToff corresponding to the detected value of the rotation speed. For example, the offset temperature data is map data with the rotation speed N as the map axis as shown in FIG.

For example, when the cooling oil is scooped up by the rotation of the rotor, when the rotation speed N is low, the degree of stirring of the cooling oil is low and the coil temperature unevenness becomes large. Therefore, even in the low speed and low load state, the temperature difference between the temperature estimation portion and the temperature detection portion differs depending on the rotation speed N. Alternatively, when the fan of the cooling air is driven by the rotation of the rotor, the temperature difference is similarly different depending on the rotation speed N. Further, when the rotation speed N increases, the output increases, the calorific value of the coil increases, and the temperature difference differs even with the same torque. Therefore, the correction accuracy can be improved by setting the offset temperature ΔToff according to the rotation speed N.

If the torque T is different at each rotation speed N, the temperature difference between the temperature estimation portion and the temperature detection portion is different, but the maximum torque in the low speed and low load state region at each rotation speed N (in this example, the torque threshold value). If the temperature difference in the steady state in the case of Tq1 etc.) is set to the offset temperature ΔToff, the estimated temperature Tmpe is corrected to the side where the temperature becomes higher, so that it can be corrected to the safe side from the viewpoint of overheat protection. The offset temperature ΔToff may be set based on the torque T in addition to the rotation speed N.

As the detection value of the rotation speed N used when referring to the offset temperature data, the average value of the rotation speed N during the immediately preceding determination period Tth is used. By using the average value of the rotation speed N in this way, it is possible to calculate the temperature difference due to the heat generation state and the cooling state of the average rotary electric machine during the determination period Tth, and to improve the setting accuracy of the offset temperature ΔToff. Can be done.

In the present embodiment, the temperature sensor is attached to a place where the temperature is lower than the temperature estimation portion in a steady state. In the present embodiment, as described above, the temperature sensor is attached to the coil end portion 103 axially protruding from the stator core, and the temperature estimation portion is the coil portion 104 (core) arranged in the stator core. The inner coil portion 104). The offset temperature ΔToff is set to a positive value. Further, the offset temperature ΔToff is set to increase as the rotation speed N increases.

In this way, even when the temperature sensor is attached to the coil end portion 103, which is easy to attach, the offset temperature ΔToff is set to a positive value, and the temperature of the temperature estimation portion where the temperature becomes higher is corrected. The accuracy can be improved. The offset temperature ΔToff may be set to a negative value.

<Control behavior>
FIG. 12 shows an example of the control behavior according to the present embodiment. At time t11, the temperature correction unit 35 determines that the low speed and low load state has been reached, starts counting up the counter value Cnt from 0, sets the detection temperature Tmpd at that time as the reference detection value Tmpd0, and sets the reference. The upper limit value Tmpmax and the lower limit value Tmpmin of the determination range are set based on the detected value Tmpd0 (not shown).

Since the temperature change of the detected temperature Tmpd is small after the time t11, the detected temperature Tmpd is within the determination range, and the counter value Cnt is not reset to 0. Note that FIG. 12 does not show the behavior of the counter value Cnt. At time t12, the temperature correction unit 35 determines that the temperature correction condition is satisfied because the counter value Cnt has reached the determination counter value Cth, and calculates the average value of the rotation speed N during the immediately preceding determination period Tth. Then, the offset temperature ΔToff corresponding to the average value of the rotation speed N is calculated, and the estimated temperature Tmpe is corrected to the value obtained by adding the offset temperature ΔToff to the detected temperature Tmpd. As a result, the estimated temperature Tmpe can be brought close to the actual temperature Tmpr of the temperature estimation portion.

3. 3. Embodiment 3
The control device 30 according to the third embodiment will be described. The description of the same components as those in the first embodiment will be omitted. The basic configuration of the rotary electric machine 1 and the control device 30 according to the present embodiment is the same as that of the first embodiment, but the temperature is periodically corrected even after the temperature correction condition is satisfied and the determination period Tth has elapsed. Is different from the first embodiment in that

In the present embodiment, the temperature correction unit 35 continues the low speed and low load state for the determination period Tth or more, the fluctuation range of the detection temperature Tmpd is equal to or less than the determination width ΔTmpd, and the estimated temperature Tmpe. When the fluctuation width is equal to or less than the determination width ΔTmpe, the estimated temperature Tmpe is periodically corrected based on the detected temperature Tmpd.

According to this configuration, when the temperature correction condition is satisfied for the determination period Tth or more, the estimated temperature Tmpe is periodically corrected by the latest detection temperature Tmpd, and the correction accuracy can be improved.

The periodic correction cycle may be set to a predetermined cycle, or may be set to the calculation cycle of the estimated temperature Tmpe or the counter value Cnt.

In the present embodiment, when the counter value Cnt is equal to or greater than the determination counter value Cth corresponding to the determination period Tth, the temperature correction unit 35 periodically corrects the estimated temperature Tmpe based on the detected temperature Tmpd. It is configured in.

<Control behavior>
FIG. 13 shows an example of the control behavior according to the present embodiment. At time t21, the temperature correction unit 35 determines that the low speed and low load state has been reached, starts counting up the counter value Cnt from 0, sets the detection temperature Tmpd at that time as the reference detection value Tmpd0, and sets the reference. The upper limit value Tmpmax and the lower limit value Tmpmin of the determination range are set based on the detected value Tmpd0 (not shown).

Since the temperature change of the detected temperature Tmpd is small after the time t21, the detected temperature Tmpd is within the determination range, and the counter value Cnt is not reset to 0. At time t22, the temperature correction unit 35 determines that the condition for temperature correction is satisfied because the counter value Cnt becomes equal to or higher than the determination counter value Cth, and corrects the estimated temperature Tmpe based on the detected temperature Tmpd. .. The counter value Cnt may be limited to an upper limit by the determination counter value Cth.

After the time t22, the temperature correction unit 35 corrects the estimated temperature Tmpe based on the detected temperature Tmpd at each correction cycle while the counter value Cnt is equal to or higher than the determination counter value Cth. In the example of FIG. 13, the correction cycle is a count-up cycle of the counter value Cnt.

In the example of FIG. 13, as in the second embodiment, the temperature correction unit 35 calculates the offset temperature ΔToff based on the rotation speed N at each correction time, and sets the estimated temperature Tmpe to the detection temperature Tmpd and the offset temperature ΔToff. Is configured to be modified to the sum of the values.

When the temperature correction is performed at each correction time, the temperature correction unit 35 calculates the average value of the rotation speed N during the determination period Tth immediately before each correction time, refers to the offset temperature data, and refers to the rotation speed N. The offset temperature ΔToff corresponding to the average value is calculated.

As described above, when the temperature correction condition is satisfied for the determination period Tth or more, the estimated temperature Tmpe is periodically corrected by the latest detection temperature Tmpd, and the correction accuracy can be improved.

4. Embodiment 4
The control device 30 according to the fourth embodiment will be described. The description of the same components as those in the first embodiment will be omitted. The basic configuration of the rotary electric machine 1 and the control device 30 according to the present embodiment is the same as that of the first embodiment, but a plurality of temperature sensors are provided and the estimated temperature is modified based on the plurality of detected temperatures. The point is different from the first embodiment.

In this embodiment, a plurality of temperature sensors are provided. Then, the temperature detection unit 33 detects the temperature of the plurality of coil portions based on the output signals of the plurality of temperature sensors. Then, when the temperature correction unit 35 corrects the estimated temperature Tmpe based on the detected temperature Tmpd, the temperature correction unit 35 corrects the estimated temperature Tmpe based on the highest detected temperature among the plurality of detected temperatures.

As described above, the coil temperature may be uneven depending on the cooling state of the cooling mechanism due to the rotation speed N or the like. According to this configuration, when there is a difference in a plurality of detected temperatures due to the unevenness of the coil temperature, the estimated temperature is corrected to the side where the temperature becomes higher, so that it can be corrected to the safe side from the viewpoint of overheat protection. ..

It should be noted that the determination of whether the fluctuation range of the detected temperature is equal to or less than the determination range and the reset processing of the counter value due to the fluctuation of the detected temperature may be performed for each of the plurality of detected temperatures, or the highest detected temperature. It may be done for the temperature detected by a preset single or multiple temperature sensors.

5. Embodiment 5
The control device 30 according to the fifth embodiment will be described. The description of the same components as those in the first embodiment will be omitted. The basic configuration of the rotary electric machine 1 and the control device 30 according to the present embodiment is the same as that of the first embodiment, but the method of estimating the coil temperature in the temperature estimation unit 34 is different from that of the first embodiment.

In the present embodiment, the temperature estimation unit 34 refers to the temperature prediction data at the calculation timing for each estimation calculation cycle Δt set in advance, and uses the current rotation speed N, the current torque information, and the previous calculation timing. Estimated temperature Tmpe (n) corresponding to the calculated estimated temperature Tmpe (n-1) after the elapse of the estimated calculation cycle Δt from the previous calculation timing (hereinafter referred to as the estimated temperature Tmpe (n) of the current calculation timing. ) Is calculated. The relationship between the rotation speed N, torque information, and the coil temperature Tmp (t0) at the reference time point t0 and the coil temperature Tmp (t0 + Δt) after the estimation calculation cycle Δt has elapsed from the reference time point t0 is preset in the temperature prediction data. Has been done. The temperature prediction data is set based on the time-series behavior of the coil temperature acquired by experiment or analysis at each operating point of the rotation speed N and the torque T.

The temperature estimation unit 34 corresponds to the temperature Tmp (t0) at the reference time corresponding to the estimated temperature Tmpe (n-1) of the rotary electric machine calculated at the previous calculation timing from the temperature prediction data, and the current rotation speed N. The rotation speed N and the torque information corresponding to the current torque information are searched, and the estimation calculation is performed from the temperature Tmp (t0) at the searched reference time point, the rotation speed N, and the reference time point t0 set corresponding to the torque information. The temperature Tmp (t0 + Δt) of the rotary electric machine after the lapse of the cycle Δt is calculated as the estimated temperature Tmp (n) after the lapse of the estimated calculation cycle Δt from the previous calculation timing.

In the present embodiment, the torque load factor Tload (= T / Tmax × 100%), which is the ratio of the torque T of the rotary electric machine to the maximum torque Tmax that can be output at the corresponding rotation speed N, is used as the torque information. The torque T may be used as the torque information.

The temperature estimation unit 34 refers to the maximum torque data in which the relationship between the rotation speed N and the maximum torque Tmax is preset as shown in FIG. 6, and calculates the maximum torque Tmax corresponding to the current rotation speed N. Then, the temperature estimation unit 34 divides the current torque T by the calculated maximum torque Tmax to calculate the current torque load factor Tload.

Further, as the temperature prediction data, torque information and the coil temperature Tmp (t0) at the reference time point t0 and the estimation calculation from the reference time point t0 are performed for each of the reference rotation speeds N0, N1 ... The temperature prediction data of the reference speed whose relationship with the coil temperature Tmp (t0 + Δt) after the lapse of the period Δt is preset is provided. Then, the temperature estimation unit 34 receives the temperature of the reference speed corresponding to the current rotation speed N from the temperature prediction data of the plurality of reference speeds provided corresponding to each of the plurality of reference rotation speeds N0, N1 ... Select the prediction data, refer to the temperature prediction data of the selected reference speed, and estimate the current calculation timing corresponding to the current torque information and the estimated temperature Tmpe (n-1) calculated at the previous calculation timing. The temperature Tmpe (n) is calculated.

In the present embodiment, as shown in FIG. 14, the temperature prediction data of the reference speed of each reference rotation speed is the map data with the torque load factor Tload and the coil temperature Tmp (t0) at the reference time as the map axis. There is. The grid points of the map axis of the torque load factor Tload and the map axis of the coil temperature Tmp (t0) at the reference time point are set in predetermined increments, respectively. Torque load factor At each intersection of each grid point of the map axis of the load and each grid point of the map axis of the coil temperature Tmp (t0) at the reference time, the rotary electric machine after the estimation calculation cycle Δt has elapsed from the corresponding reference time point t0. The value of the coil temperature Tmp (t0 + Δt) of is set.

In the present embodiment, seven reference rotation speeds N0, N1, ... N6 are provided, the step of the map axis of the torque load factor Tload is set to 20%, and the temperature Tmp (t0) at the reference time point is set. The notch of the map axis of is set to 20 ° C.

The temperature estimation process of the temperature estimation unit 34 is executed every estimation calculation cycle Δt. As shown in FIG. 15, as described above, the temperature estimation unit 34 refers to the maximum torque data and calculates the maximum torque Tmax corresponding to the current rotation speed N. Then, the temperature estimation unit 34 divides the current torque T (torque command value To in this example) by the maximum torque Tmax to calculate the torque load factor Load. Then, the temperature estimation unit 34 refers to the temperature prediction data, and corresponds to the current rotation speed N, the current torque load factor Load, and the estimated temperature Tmpe (n-1) of the previous calculation timing, and has the current calculation timing. The estimated temperature Tmpe (n) is calculated. The temperature estimation unit 34 holds the estimated temperature Tmpe (n) of the current calculation timing in the RAM or the like, and uses it as the estimated temperature Tmpe (n-1) of the previous calculation timing at the next calculation timing.

When the temperature correction unit 35 corrects the estimated temperature Tmpe (n) based on the detected temperature Tmpd, the temperature correction unit 35 corrects the estimated temperature Tmpe (n) calculated by referring to the temperature prediction data, and at the next calculation timing. The estimated temperature Tmpe (n-1) used in the RAM or the like is also modified.

A plurality of temperature prediction data are preset according to the state of the cooling mechanism and one or both of the DC voltage Vdc, and the estimation calculation is performed according to the state of the cooling mechanism and one or both of the DC voltage Vdc. The temperature prediction data used may be changed.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations. Therefore, innumerable variations not exemplified are envisioned within the scope of the techniques disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Rotating electric machine, 30 Rotating electric machine control device, 33 temperature detection unit, 34 temperature estimation unit, 35 temperature correction unit, 100 stator, 101 stator core, 102 coil, 103 coil end unit, 110 temperature sensor, Cnt counter value , Cth judgment counter value, N rotation speed, N0 reference rotation speed, N1 speed threshold, Tmpd detection temperature (coil temperature detection value), Tmpd0 reference detection value, Tmpe estimated temperature (coil temperature estimation value), Tmpe0 reference estimation value , Tq1 torque threshold, Tth judgment period, ΔToff offset temperature

Claims (13)

A temperature detector that detects the temperature based on the output signal of the temperature sensor that detects the temperature of the coil provided in the stator of the rotary electric machine.
A temperature estimation unit that estimates the temperature of the coil based on the operating state of the rotary electric machine,
When the low speed and low load state in which the rotation speed of the rotary electric machine is equal to or less than the speed threshold and the torque of the rotary electric machine is equal to or less than the torque threshold value continues during the determination period, the temperature is based on the detected value of the temperature. A control device for a rotary electric machine including a temperature correction unit that corrects an estimated value of the temperature estimated by the estimation unit. In the temperature correction unit, the low speed and low load state continues during the determination period, the fluctuation range of the detected value of the temperature is equal to or less than the determination range, and the fluctuation range of the estimated temperature value is The control device for a rotary electric machine according to claim 1, wherein when the temperature is equal to or less than the determination width, the estimated value of the temperature is corrected based on the detected value of the temperature. When the temperature correction unit corrects the estimated value of the temperature based on the detected value of the temperature, the temperature correcting unit corrects the estimated temperature to a value obtained by adding the offset temperature to the detected value of the temperature. Or the control device for the rotary electric machine according to 2. The offset temperature is a temperature difference that occurs between the temperature of the temperature estimation portion, which is the portion of the coil that estimates the temperature, and the temperature of the mounting location of the temperature sensor in the low speed and low load state in the steady state. The control device for a rotary electric machine according to claim 3, which is preset in accordance with the above. The temperature correction unit refers to the offset temperature data in which the relationship between the rotation speed and the offset temperature is preset, and calculates the offset temperature corresponding to the detected value of the rotation speed according to claim 3 or 4. Rotating electric machine control device. The control device for a rotary electric machine according to claim 5, wherein the temperature correction unit uses the average value of the detection values of the rotation speed during the immediately preceding determination period as the detection value of the rotation speed. The temperature sensor is attached to a place where the temperature is lower than the temperature estimation part, which is the part of the coil that estimates the temperature, in a steady state.
The control device for a rotary electric machine according to any one of claims 3 to 6, wherein the offset temperature is set to a positive value. The temperature sensor is attached to a coil end portion that protrudes axially from the stator core.
The temperature estimation part, which is the part of the coil that estimates the temperature, is the coil part arranged in the stator core.
The control device for a rotary electric machine according to any one of claims 3 to 7, wherein the offset temperature is set to a positive value. In the temperature correction unit, the low speed and low load state continues for the determination period or longer, the fluctuation range of the detected value of the temperature is equal to or less than the determination range, and the fluctuation range of the estimated temperature value. The control device for a rotary electric machine according to claim 1, wherein when the temperature is equal to or less than the determination width, the estimated value of the temperature is corrected periodically based on the detected value of the temperature. The temperature correction unit counts up the counter value for measuring the elapsed time in the low speed low load state, resets the counter value to 0 in the case of not in the low speed low load state, and the counter. The control device for a rotary electric machine according to claim 1, wherein when the value reaches the determination counter value corresponding to the determination period, the estimated value of the temperature is corrected based on the detected value of the temperature. The temperature correction unit sets the detection value of the temperature at the time when the counter value starts counting up from 0 as a reference detection value, and after starting to count up the counter value from 0, the detection value of the temperature. However, when the determination range deviated from the determination range set based on the reference detection value, the counter value is reset to 0, and the counter value is reset to 0.
The estimated value of the temperature at the time when the counter value starts counting up from 0 is set as the reference estimated value, and after the counter value starts counting up from 0, the estimated value of the temperature becomes the reference estimated value. The control device for a rotary electric machine according to claim 10, wherein the counter value is reset to 0 when the determination range deviated from the determination range set with reference to. The temperature correction unit according to claim 10 or 11 periodically corrects an estimated value of the temperature based on the detected value of the temperature when the counter value is equal to or higher than the determination counter value. Control device for rotary electric machine. A plurality of the temperature sensors are provided, and the temperature sensors are provided.
The temperature detection unit detects a plurality of temperatures based on the output signals of the plurality of temperature sensors.
When the temperature correction unit corrects the temperature estimation value based on the temperature detection value, the temperature correction unit obtains the temperature estimation value based on the highest temperature detection value among the plurality of temperature detection values. The control device for a rotary electric machine according to any one of claims 1 to 12.

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