JP2021093777A - Rotary electric machine system and control method for rotary electric machine system - Google Patents

Abstract

To suppress demagnetization corresponding to a temperature of a permanent magnet for magnetic field of a rotary electric machine and to suppress execution of torque limitation of the rotary electric machine.SOLUTION: A rotary electric machine system 10 comprises a motor 11, a battery 12, a power conversion device 13, and a control unit 14. The motor 11 includes a rotor including a magnet and a stator including a coil which generates a rotary magnetic field. The power conversion device 13 includes a booster 21 which boosts an output voltage of the battery 12. The control unit 14 controls a boosted voltage command Vb with respect to the boosted voltage outputted from the booster 21 and an advance angle θ with respect to a phase of an application voltage applied to the coil of the motor 11. The control unit 14 includes a magnet temperature estimation section 32 and a boosted voltage and advance angle control section 34. The boosted voltage and advance angle control section 34 switches efficiency preferential control and protection preferential control in accordance with a result of magnitude comparison between a temperature estimate Tm of the magnet of the motor 11 estimated by the magnet temperature estimation section 32 and a first temperature threshold.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary electric machine system and a control method for the rotary electric machine system.

Conventionally, in a rotary electric machine having a permanent magnet for a field magnet, a control device that corrects a torque command so as to compensate for a torque decrease based on a demagnetization characteristic according to the temperature of the permanent magnet is known (for example, a patent). Reference 1).
Conventionally, in a rotary electric machine having a permanent magnet for a field magnet, when the output limitation is executed based on the demagnetization characteristic according to the temperature of the permanent magnet, the temperature of a part other than the permanent magnet of the rotary electric machine and the rotary electric machine There is known a control device that suppresses excessive output limitation by referring to the flow rate of the coolant that cools the magnet (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 08-331900 Japanese Unexamined Patent Publication No. 2013-03929

By the way, in the control device of the rotary electric machine according to the above-mentioned prior art, there is a possibility that the permanent magnet is irreversibly demagnetized as the temperature of the rotary electric machine rises. Further, if the torque limitation of the rotating electric machine is executed in order to suppress the demagnetization of the permanent magnet, it may be difficult to secure a desired driving force. From these, it is desired to suppress the demagnetization according to the temperature of the permanent magnet for the field of the rotary electric machine and to suppress the execution of the torque limitation of the rotary electric machine.

The present invention has been made in view of the above circumstances, and is a rotary electric machine system capable of suppressing demagnetization according to the temperature of a magnet for a field of a rotary electric machine and suppressing execution of torque limitation of the rotary electric machine. It is an object of the present invention to provide a control method of a rotary electric machine system.

In order to solve the above problems and achieve the above object, the present invention has adopted the following aspects.
(1) The rotary electric machine system according to one aspect of the present invention (for example, the rotary electric machine system 10 in the embodiment) is a rotary electric machine (for example, an embodiment) including a rotor having a magnet and a stator having a winding for generating a rotational magnetic field. It has a motor 11) in the embodiment, a power supply (for example, a battery 12 in the embodiment), and a booster (for example, a booster 21 in the embodiment) that boosts the output voltage of the power supply, and also has the power supply and the rotation. A power conversion device that transfers power to and from an electric machine (for example, the power conversion device 13 in the embodiment) and a boost voltage command for the boost voltage output from the booster (for example, the boost voltage command Vb in the embodiment). ) And a control device (for example, the control unit 14 in the embodiment) for controlling the advance angle (for example, the advance angle θ in the embodiment) of the applied voltage applied to the winding of the rotary electric machine with respect to the phase. The control device includes a magnet temperature acquisition unit (for example, a magnet temperature estimation unit 32 in the embodiment) for acquiring the temperature of the magnet of the rotary electric machine (for example, a temperature estimation value Tm in the embodiment), and the magnet. Efficiency priority control that prioritizes the operating efficiency of the rotary electric machine according to the result of magnitude comparison between the temperature of the magnet acquired by the temperature acquisition unit and the predetermined threshold temperature (for example, the first temperature threshold in the embodiment). The control switching unit (for example, the boosted voltage and advance angle control unit 34 in the embodiment) is provided by switching between the protection priority control that prioritizes the suppression of demagnetization of the magnet.

(2) In the rotary electric machine system according to the above (1), the control device may set the boost voltage to the maximum voltage and fix the advance angle by the protection priority control.

(3) In the rotary electric machine system according to the above (1) or (2), the control device gives priority to the protection when the temperature of the magnet acquired by the magnet temperature acquisition unit is larger than the predetermined threshold temperature. Control may be performed.

(4) In the rotary electric machine system according to any one of (1) to (3) above, the control device has the temperature of the magnet acquired by the magnet temperature acquisition unit in the protection priority control and the second. The torque limitation of the rotary electric machine may be executed according to the result of the magnitude comparison with the predetermined threshold temperature (for example, the second temperature threshold in the embodiment).

(5) A method of controlling a rotary electric machine system according to one aspect of the present invention includes a rotary electric machine (for example, a motor 11 in the embodiment) having a rotor having a magnet and a stator having a winding for generating a rotating magnetic field, and a power supply. It has (for example, the battery 12 in the embodiment) and a booster (for example, the booster 21 in the embodiment) that boosts the output voltage of the power supply, and transfers power between the power supply and the rotary electric machine. The power conversion device (for example, the power conversion device 13 in the embodiment), the boost voltage command for the boost voltage output from the booster (for example, the boost voltage command Vb in the embodiment), and the winding of the rotary electric machine. A rotary electric system (for example, in the embodiment) including a control device (for example, the control unit 14 in the embodiment) for controlling the advance angle (for example, the advance angle θ in the embodiment) with respect to the phase of the applied voltage applied to the In the control method of the rotary electric machine system 10), the magnet temperature acquisition step (for example, embodiment) in which the control device acquires the temperature of the magnet of the rotary electric machine (for example, the estimated temperature value Tm in the embodiment). In step S04), the control device responds to the result of magnitude comparison between the temperature of the magnet acquired by the magnet temperature acquisition step and the predetermined threshold temperature (for example, the first temperature threshold in the embodiment). A control switching step (for example, step S06, step S07, step S06 in the embodiment) for switching and executing the efficiency priority control that prioritizes the operating efficiency of the rotary electric machine and the protection priority control that prioritizes the suppression of demagnetization of the magnet. S09 and step S10) are included.

(6) In the control method of the rotary electric machine system according to the above (5), the control device may set the boost voltage to the maximum voltage and fix the advance angle by the protection priority control.

(7) In the control method of the rotary electric machine system according to the above (5) or (6), the control device is used when the temperature of the magnet acquired by the magnet temperature acquisition step is larger than the predetermined threshold temperature. The protection priority control may be executed.

(8) In the control method of the rotary electric machine system according to any one of (5) to (7) above, the control device is the temperature of the magnet acquired by the magnet temperature acquisition step in the protection priority control. The torque limitation of the rotary electric machine may be executed according to the result of magnitude comparison between the temperature and the second predetermined threshold temperature (for example, the second temperature threshold in the embodiment).

According to (1) above, the temperature of the magnet can be adjusted by providing a control switching unit that switches between efficiency priority control and protection priority control according to the result of magnitude comparison between the temperature of the magnet for field magnetism and the predetermined threshold temperature. It is possible to suppress the execution of torque limitation of the rotating electric machine while suppressing the corresponding demagnetization.

In the case of (2) above, the protection priority control can perform energization that suppresses demagnetization according to the temperature of the magnet most by maximizing the boost voltage and fixing the advance angle. Compared to efficiency priority control, which performs energization to minimize loss, protection priority control can increase the guaranteed temperature for demagnetization with a magnet with low heat resistance, and the cost required for a magnet with desired performance increases. It can be suppressed.

In the case of (3) above, the protection priority control is executed when the temperature of the magnet is higher than the predetermined threshold temperature, for example, when the temperature of the magnet becomes higher than the predetermined threshold temperature when the efficiency priority control is executed. It is possible to prevent the torque limitation from being executed immediately. For example, it is possible to extend the time until the torque limitation is executed, and it is possible to easily secure a desired driving force.

In the case of (4) above, the protection priority control is, for example, efficiency priority control and protection priority control by executing torque limitation of the rotary electric machine according to the result of magnitude comparison between the magnet temperature and the second predetermined threshold temperature. Compared with the predetermined threshold temperature for determining the switching of the torque limit, it is possible to more appropriately determine whether or not the torque limitation is to be executed.

According to (5) above, the temperature of the magnet is adjusted by including a control switching step of switching between efficiency priority control and protection priority control according to the result of magnitude comparison between the temperature of the magnet for field magnetism and the predetermined threshold temperature. It is possible to suppress the execution of torque limitation of the rotating electric machine while suppressing the corresponding demagnetization.

In the case of (6) above, the protection priority control can perform energization that suppresses demagnetization according to the temperature of the magnet most by maximizing the boost voltage and fixing the advance angle. Compared to efficiency priority control, which performs energization to minimize loss, protection priority control can increase the guaranteed temperature for demagnetization with a magnet with low heat resistance, and the cost required for a magnet with desired performance increases. It can be suppressed.

In the case of (7) above, the protection priority control is executed when the temperature of the magnet is higher than the predetermined threshold temperature, for example, when the temperature of the magnet becomes higher than the predetermined threshold temperature when the efficiency priority control is executed. It is possible to prevent the torque limitation from being executed immediately. For example, it is possible to extend the time until the torque limitation is executed, and it is possible to easily secure a desired driving force.

In the case of (8) above, the protection priority control is, for example, efficiency priority control and protection priority control by executing torque limitation of the rotary electric machine according to the result of magnitude comparison between the magnet temperature and the second predetermined threshold temperature. Compared with the predetermined threshold temperature for determining the switching of the torque limit, it is possible to more appropriately determine whether or not the torque limitation is to be executed.

The block diagram which shows the structure of the rotary electric machine system which concerns on embodiment of this invention. The flowchart which shows the control method of the rotary electric machine system which concerns on embodiment of this invention.

Hereinafter, an embodiment of the rotary electric system of the present invention will be described with reference to the accompanying drawings.
The rotary electric system according to the present embodiment is mounted on, for example, an electric vehicle. The electric vehicle is an electric vehicle, a hybrid vehicle, a fuel cell vehicle, or the like. Electric vehicles are powered by batteries. The hybrid vehicle is driven by a battery and an internal combustion engine as power sources. A fuel cell vehicle is driven by a fuel cell as a power source.

FIG. 1 is a block diagram showing a configuration of a rotary electric machine system 10 according to an embodiment.
As shown in FIG. 1, the rotary electric machine system 10 includes a motor 11, a battery 12, a power conversion device 13, a control unit 14, and a gate drive unit 15.
The motor 11 is, for example, a three-phase AC permanent magnet type synchronous motor or a brushless DC motor. The three phases are U phase, V phase and W phase. The motor 11 includes a rotor having a permanent magnet for a field magnet and a stator having a three-phase winding that generates a rotating magnetic field that rotates the rotor.
The motor 11 generates rotational power by the electric power supplied from the battery 12 via the power conversion device 13. The motor 11 may generate generated electric power by a rotational driving force input to the rotary shaft from another power source such as an internal combustion engine or wheels or the like.
The battery 12 is a high-voltage battery such as a power source for a vehicle. For example, the battery 12 includes a plurality of battery cells connected in series or in parallel.

The power conversion device 13 includes a booster 21 and an inverter 22.
The booster 21 is connected between the positive electrode and the negative electrode of the battery 12 and the positive electrode and the negative electrode of the inverter 22. The booster 21 includes, for example, a switching element and a reactor. The booster 21 applies a boost voltage higher than the output voltage of the battery 12 (voltage between the positive electrode and the negative electrode) between the positive electrode and the negative electrode of the inverter 22 in response to a switching command input from the gate drive unit 15 to the gate of the switching element. Output to.
The inverter 22 is connected between the positive electrode and the negative electrode on the output side of the booster 21 and the three-phase winding of the motor 11. The inverter 22 includes, for example, a plurality of switching elements. For example, a plurality of switching elements are bridge-connected to form a three-phase bridge circuit. The inverter 22 converts the DC power output from the booster 21 into three-phase AC power in response to a switching command input from the gate drive unit 15 to the gate of the switching element.

The control unit 14 controls the operation of the motor 11 based on the detected values of the state quantities output from various sensors. The control unit 14 is a software function unit that functions by executing a predetermined program by a processor such as a CPU (Central Processing Unit). The software function unit is an ECU (Electronic Control Unit) including a processor such as a CPU, a ROM (Read Only Memory) for storing a program, a RAM (Random Access Memory) for temporarily storing data, and an electronic circuit such as a timer. .. At least a part of the control unit 14 may be an integrated circuit such as an LSI (Large Scale Integration).

The control unit 14 generates a control signal to be input to the gate drive unit 15. The control signal is a signal indicating the timing for driving each switching element of the power conversion device 13 on (conducting) / off (disconnecting). For example, the control signal is a pulse width modulated signal based on a sinusoidal voltage command value Vc, which will be described later, a carrier signal such as a triangular wave, and a switching frequency. The details of the control unit 14 will be described later.
The gate drive unit 15 is connected to the gate of each switching element of the power conversion device 13. The gate drive unit 15 generates a gate signal that drives each switching element on (conducting) / off (disconnecting) based on the control signal received from the control unit 14. For example, the gate signal is a signal generated by amplification of a control signal, level shift, or the like.

The details of the control unit 14 will be described below.
The control unit 14 includes a torque command calculation unit 31, a magnet temperature estimation unit 32, a magnet temperature determination unit 33, a boost voltage and advance angle control unit 34, a torque limit unit 35, and a current control unit 36.
The torque command calculation unit 31 determines the output torque of the motor 11 by searching a map for a predetermined map based on, for example, the accelerator operation amount Ac by the driver of the vehicle, the speed V of the vehicle, and the state amount of the boosted voltage command Vb described later. The torque command Tc for is calculated.

The magnet temperature estimation unit 32 estimates the temperature of the magnet of the motor 11 based on, for example, the rotation speed ω of the motor 11 according to the speed V of the vehicle and the state quantity of the boosted voltage command Vb described later. The magnet temperature estimation unit 32 is based on, for example, the state amount of the operating point of the motor 11, the temperature of the winding, the thermal model between the magnet and the winding, the temperature of the coolant that cools the motor 11, and the like. The estimated temperature value Tm is calculated.

The magnet temperature determination unit 33 determines the magnitude of the temperature estimation value Tm estimated by the magnet temperature estimation unit 32 and a predetermined temperature threshold value, and outputs a signal of the determination result. The predetermined temperature threshold value is, for example, a first temperature threshold value in the efficiency priority control or a second temperature threshold value in the protection priority control. The efficiency priority control is a control that prioritizes the operating efficiency of the motor 11. The efficiency priority control is, for example, a control that minimizes the loss of the motor 11. The protection priority control is a control that prioritizes the suppression of demagnetization of the magnet of the motor 11. The protection priority control is, for example, a control that limits the field weakening current (d-axis current described later) of the weakening magnetic flux control. The weakening magnetic flux control is an advance angle control in which the phase of the winding current (current of the winding of the motor 11) is set to a phase before the phase of the induced voltage so as to equivalently weaken the field amount of the rotor of the motor 11. .. The magnet temperature determination unit 33 sets a first temperature threshold value or a second temperature threshold value as a predetermined temperature threshold value according to a boost voltage and a control mode selection command received from the advance angle control unit 34, which will be described later.

The boost voltage and advance angle control unit 34 controls the boost voltage command Vb for the boost voltage output from the booster 21 and the advance angle θ with respect to the phase of the applied voltage applied to the three-phase windings of the motor 11. .. The advance angle θ is an angle at which the phase of the applied voltage is advanced in order to compensate for the phase delay of the winding current (current of the winding of the motor 11) with respect to the phase of the applied voltage caused by the inductance component of the winding of the motor 11. .. The advance angle θ makes the phase of the winding current match the desired phase by advancing the phase of the applied voltage so as to compensate for the phase delay of the winding current.
The boost voltage and advance angle control unit 34 outputs a selection command for selecting efficiency priority control or protection priority control as the control mode. The boost voltage and advance angle control unit 34 sets efficiency priority control to the default control mode in, for example, initial setting or reference setting.
The boost voltage and advance angle control unit 34 selects efficiency priority control or protection priority control as the control mode according to the signal of the determination result received from the magnet temperature determination unit 33. For example, the boosted voltage and advance angle control unit 34 selects efficiency priority control as the control mode when it is determined in the determination result signal that the temperature estimated value Tm is equal to or less than the first temperature threshold value. On the other hand, the boosted voltage and advance angle control unit 34 selects the protection priority control as the control mode when the temperature estimation value Tm is determined to be larger than the first temperature threshold value in the determination result signal.

For example, when efficiency priority control is selected as the control mode, the boost voltage and advance angle control unit 34 uses the motor 11 by searching a map for a predetermined map based on the accelerator operation amount Ac and the state amount such as the vehicle speed V. The boosted voltage command Vb that minimizes the loss of The boost voltage and advance angle control unit 34 calculates the optimum advance angle θ that compensates for the phase delay of the winding current with respect to the phase of the applied voltage of the motor 11 based on the state quantity such as the rotation speed ω of the motor 11.
For example, when the protection priority control is selected as the control mode, the boost voltage and advance angle control unit 34 sets the boost voltage command Vb to a predetermined maximum voltage and fixes the advance angle θ to an appropriate angle. The appropriate angle is at the time when the control mode is switched from the efficiency priority control to the protection priority control, for example, when the magnet temperature determination unit 33 determines that the temperature estimated value Tm is larger than the first temperature threshold value. The advance angle θ and the like.

The torque limiting unit 35 limits the size of the torque command Tc output from the torque command calculation unit 31 as necessary based on the determination result signal output from the magnet temperature determining unit 33. For example, when the torque limit unit 35 determines in the determination result signal that the temperature estimated value Tm is equal to or less than the second temperature threshold value, the torque limit unit 35 does not execute the restriction of the torque command Tc and receives it from the torque command calculation unit 31. The torque command Tc is output without being changed. On the other hand, when the torque limit unit 35 determines in the determination result signal that the temperature estimated value Tm is larger than the second temperature threshold, the torque limit unit 35 executes the limitation of the torque command Tc and receives it from the torque command calculation unit 31. The magnitude of the torque command Tc is regulated to a predetermined torque or less, and the regulated torque command Tc is output.

The current control unit 36 outputs a voltage command value Vc with respect to the applied voltage of the motor 11 based on the torque command Tc, the boost voltage command Vb, and the advance angle θ. The current control unit 36 executes current feedback control, for example, on the dq coordinates of the rotation orthogonal coordinates. The dq coordinates include a d-axis (field axis) in the magnetic flux direction of the field magnetic pole by the magnet of the rotor of the motor 11, and a q-axis (torque axis) in the direction orthogonal to the d-axis, and the rotation phase of the rotor of the motor 11. Rotates in synchronization with. The current control unit 36 calculates a d-axis current command and a q-axis current command, which are DC signals, as current commands for AC signals applied from the power conversion device 13 to each phase of the motor 11. The current control unit 36 calculates a phase voltage command value for the phase voltage applied to each phase of the motor 11 as a voltage command value Vc based on the d-axis current command and the q-axis current command. The current control unit 36 converts the detected value of the phase current actually supplied from the power conversion device 13 to each phase of the motor 11 on the dq coordinates based on the rotation angle of the rotor, and obtains the d-axis current and the q-axis current. And feedback control is executed so that the deviations between the d-axis current command and the q-axis current command are set to zero.
The current control unit 36 sets the voltage command value Vc, for example, by executing various current controls as necessary in cooperation with or independently of the above-mentioned boost voltage command Vb and efficiency priority control and protection priority control for the advance angle θ. calculate. Various current controls include, for example, control to make the d-axis current zero, control to maximize the output torque with respect to the same current of the motor 11, and control to weaken the magnetic flux. For example, the current control unit 36 executes the weakening magnetic flux control when suppressing the increase in the induced voltage in the high-speed rotation region of the motor 11 and relaxing the withstand voltage condition of the inverter 22.

The control method of the rotary electric machine system 10 will be described below.
FIG. 2 is a flowchart showing a control method of the rotary electric machine system 10 according to the embodiment.
First, in step S01, the control unit 14 acquires a state quantity such as an accelerator operation amount Ac and a vehicle speed V.
Next, in step S02, the control unit 14 calculates the rotation speed ω of the motor 11 based on the speed V of the vehicle and the like.
Next, in step S03, the control unit 14 calculates the torque command Tc based on the state quantities such as the accelerator operation amount Ac, the vehicle speed V, and the boost voltage command Vb.
Next, in step S04, the control unit 14 estimates the temperature of the magnet of the motor 11 based on the state quantities such as the rotation speed ω of the motor 11 and the boost voltage command Vb.

Next, in step S05, the control unit 14 determines whether or not execution of protection priority control is selected.
If the determination result in step S05 is "YES", the control unit 14 advances the process to step S09.
On the other hand, when the determination result in step S05 is "NO", the control unit 14 advances the process to step S06.

Next, in step S06, the control unit 14 determines whether or not the temperature estimation value Tm of the magnet of the motor 11 is larger than a predetermined temperature threshold value. The predetermined temperature threshold is the first temperature threshold.
If the determination result in step S06 is "YES", the control unit 14 advances the process to step S09.
On the other hand, when the determination result in step S06 is "NO", the control unit 14 advances the process to step S07.
Next, in step S07, the control unit 14 executes efficiency priority control. The control unit 14 calculates the boosted voltage command Vb that minimizes the loss of the motor 11, and also calculates the optimum advance angle θ that compensates for the phase delay of the winding current with respect to the phase of the applied voltage of the motor 11.
Next, in step S08, the control unit 14 executes current control and advances the process to the end.

Next, in step S09, the control unit 14 executes protection priority control. The control unit 14 sets the boost voltage command Vb to a predetermined maximum voltage and fixes the advance angle θ to an appropriate angle. The appropriate angle is, for example, the advance angle θ at this point.
Next, in step S10, the control unit 14 sets a second temperature threshold value at a predetermined temperature threshold value.
Next, in step S11, the control unit 14 determines whether or not the temperature estimation value Tm of the magnet of the motor 11 is larger than a predetermined temperature threshold value.
If the determination result in step S11 is "YES", the control unit 14 advances the process to step S12.
On the other hand, when the determination result in step S11 is "NO", the control unit 14 advances the process to step S08.
Next, in step S12, the control unit 14 executes the torque limit of the torque command Tc, and proceeds to the process in step S08 described above.

As described above, according to the rotary electric machine system 10 and the control method of the rotary electric machine system 10 of the present embodiment, the efficiency depends on the result of the magnitude comparison between the estimated temperature value Tm of the magnet for the field magnet and the predetermined temperature threshold value. By providing the step-up voltage and advance angle control unit 34 for switching between the priority control and the protection priority control, it is possible to suppress the execution of the torque limitation of the motor 11 while suppressing the demagnetization according to the temperature of the magnet.

In the protection priority control, the boost voltage command Vb is set to the maximum voltage and the advance angle θ is fixed, so that energization that suppresses demagnetization according to the temperature of the magnet can be performed most. Compared to efficiency priority control, which performs energization to minimize loss, protection priority control can increase the guaranteed temperature for demagnetization with a magnet with low heat resistance, and the cost required for a magnet with desired performance increases. It can be suppressed.

The protection priority control is executed when the temperature estimated value Tm of the magnet is larger than the first temperature threshold value. Therefore, for example, when the temperature estimated value Tm of the magnet becomes larger than the first temperature threshold value when the efficiency priority control is executed. It is possible to prevent the torque limitation from being executed immediately. For example, it is possible to extend the time until the torque limitation is executed, and it is possible to easily secure a desired driving force.

The protection priority control is for determining switching between efficiency priority control and protection priority control, for example, by executing torque limitation of the motor 11 according to the result of magnitude comparison between the magnet temperature estimated value Tm and the second temperature threshold value. Compared with the first temperature threshold value of No. 1, it is possible to more appropriately determine whether or not the torque limitation needs to be executed.

Hereinafter, a modified example of the embodiment will be described.
In the above-described embodiment, the power conversion device 13 is provided with the booster 21, but the present invention is not limited to this, and a voltage controller for boosting and lowering the voltage may be provided instead of the booster 21.

The embodiments of the present invention are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

10 ... rotary electric machine system, 11 ... motor (rotary electric machine), 12 ... battery (power supply), 13 ... power converter, 14 ... control unit (control device), 15 ... gate drive unit, 21 ... booster, 22 ... inverter , 31 ... Torque command calculation unit, 32 ... Magnet temperature estimation unit (magnet temperature acquisition unit), 33 ... Magnet temperature determination unit, 34 ... Boost voltage and advance angle control unit (control switching unit), 35 ... Torque limit unit, 36 … Current control unit

Claims (8)

A rotating electric machine having a rotor having a magnet and a stator having a winding that generates a rotating magnetic field,
Power supply and
A power conversion device having a booster for boosting the output voltage of the power supply and transmitting and receiving power between the power supply and the rotary electric machine.
It is provided with a boost voltage command for a boost voltage output from the booster and a control device for controlling the advance angle of the applied voltage applied to the winding of the rotary electric machine with respect to the phase.
The control device is
A magnet temperature acquisition unit that acquires the temperature of the magnet of the rotary electric machine,
According to the result of magnitude comparison between the temperature of the magnet and the predetermined threshold temperature acquired by the magnet temperature acquisition unit, the efficiency priority control that prioritizes the operating efficiency of the rotary electric machine and the demagnetization suppression of the magnet are prioritized. A rotary electric machine system characterized by being provided with a control switching unit that switches and executes protection priority control. The control device is
The rotary electric system according to claim 1, wherein the step-up voltage is maximized and the advance angle is fixed by the protection priority control. The control device is
The rotary electric system according to claim 1 or 2, wherein the protection priority control is executed when the temperature of the magnet acquired by the magnet temperature acquisition unit is larger than the predetermined threshold temperature. The control device is
It is characterized in that the torque limitation of the rotary electric machine is executed according to the result of magnitude comparison between the temperature of the magnet acquired by the magnet temperature acquisition unit in the protection priority control and the second predetermined threshold temperature. The rotary electric machine system according to any one of claims 1 to 3. A rotating electric machine having a rotor having a magnet and a stator having a winding that generates a rotating magnetic field,
Power supply and
A power conversion device having a booster for boosting the output voltage of the power supply and transmitting and receiving power between the power supply and the rotary electric machine.
A control method for a rotary electric machine system including a boost voltage command for a boost voltage output from the booster and a control device for controlling an advance angle of an applied voltage applied to the winding of the rotary electric machine with respect to a phase.
A magnet temperature acquisition step in which the control device acquires the temperature of the magnet of the rotary electric machine, and
The control device performs efficiency priority control that prioritizes the operating efficiency of the rotary electric machine and reduction of the magnet according to the result of magnitude comparison between the temperature of the magnet acquired by the magnet temperature acquisition step and the predetermined threshold temperature. A control method for a rotating electric machine system, which includes a control switching step for switching and executing protection priority control that prioritizes magnetic suppression. The control device is
The control method for a rotary electric system according to claim 5, wherein the step-up voltage is maximized and the advance angle is fixed by the protection priority control. The control device is
The control of the rotary electric system according to claim 5 or 6, wherein the protection priority control is executed when the temperature of the magnet acquired by the magnet temperature acquisition step is larger than the predetermined threshold temperature. Method. The control device is
It is characterized in that the torque limitation of the rotary electric machine is executed according to the result of magnitude comparison between the temperature of the magnet acquired by the magnet temperature acquisition step in the protection priority control and the second predetermined threshold temperature. The control method for a rotary electric system according to any one of claims 5 to 7.

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