Control device for rotary electric machine

Abstract

This control device for a rotary electric machine is configured such that when a first demagnetization determination means (62) determines that a first rotary electric machine (3) is demagnetized, the output of a second rotary electric machine (4) is suppressed while driving is continued, and when a second demagnetization determination means (72) determines that the second rotary electric machine (4) is demagnetized, the output of the first rotary electric machine (3) is suppressed while driving is continued.

Description

Rotating electric machine control device

[0001] The present disclosure relates to a control device for a rotating electric machine.

[0002] Rotating electric machines such as permanent magnet synchronous motors have permanent magnets as field poles. The output torque of a rotating electric machine having permanent magnets as field poles corresponds to the magnitude of the magnetic force of the permanent magnets. As is well known, the magnetic force of permanent magnets can decrease due to a phenomenon known as demagnetization. One cause of demagnetization of permanent magnets is an increase in the temperature of the permanent magnets. Therefore, when the temperature of the rotating electric machine increases and the permanent magnets as field poles become hot, demagnetization occurs, reducing the magnetic force of the permanent magnets, and the rotating electric machine is unable to obtain the desired output.

[0003] Various techniques have been proposed for controlling rotating electric machines to deal with demagnetization of permanent magnets. For example, Patent Document 1 discloses a technique in which a detected permanent magnet induced voltage is compared with the permanent magnet induced voltage in a fully magnetized state to generate an indication of the magnetism of the permanent magnet, and when the indication of the magnetism reaches a predetermined threshold, the rotating electric machine is disabled to avoid damage to components of the rotating electric machine.

[0004] Furthermore, Patent Document 2 discloses a technology in which magnetic force is estimated based on at least two detection signals from among the motor rotation speed, motor voltage, and motor current, and when it is determined that demagnetization has occurred from the estimated magnetic force, the technology selects whether to control the motor so that its reluctance torque increases, or to limit the output of the motor drive control unit.

[0005] JP 2003-204693 A JP 2013-110804 A

[0006] According to the conventional technology disclosed in Patent Document 1, when demagnetization of a permanent magnet is detected, the rotating electric machine is rendered inoperable to prevent damage to the components of the rotating electric machine, and therefore the rotating electric machine cannot be continuously driven after demagnetization of a permanent magnet is detected.

[0007] Furthermore, for example, in a device in which power is supplied from the same power source to a rotating electric machine used to drive a vehicle and a rotating electric machine used for generating electricity, if the shortfall in power supplied from the power source to one of the rotating electric machines is made up for by the output of the other rotating electric machine, when the shortfall in power is calculated from the torque command and the mechanical output of the rotational speed, according to the technology disclosed in Patent Document 2, the magnetic force is estimated based on at least two detection signals from the rotation speed, voltage, and current of the rotating electric machine, and therefore a mismatch occurs between the actual output of the rotating electric machine whose output torque has decreased due to demagnetization and the output calculated based on the above estimation.

[0008] In the above-described conventional technology, in order to compensate for the decrease in output of a rotating electric machine due to demagnetization with the output of another rotating electric machine, the insufficient or excess output is flowed out or in from the power supply, which raises concerns that a current larger than expected during normal operation may flow into the power supply, damaging components, or that the rotating electric machine may stop operating due to an overcurrent being detected on the power supply side.

[0009] The present disclosure discloses technology for solving the above-mentioned problems, and aims to provide a control device for a rotating electric machine that can continue to operate a rotating electric machine without causing damage to components, even if the output of one of multiple rotating electric machines connected to a common power source decreases due to demagnetization of a permanent magnet.

[0010] The control device for a rotating electric machine disclosed in the present application is a control device for a rotating electric machine that connects and drives at least one first rotating electric machine that has field poles made of permanent magnets and armature windings that generate magnetic flux that interlinks with the field poles and operates as an electric motor, and at least one second rotating electric machine that has field poles made of permanent magnets and armature windings that generate magnetic flux that interlinks with the field poles and operates as a generator, and is characterized in that it comprises: a first demagnetization determination means that determines demagnetization of the permanent magnets in the first rotating electric machine; and a second demagnetization determination means that determines demagnetization of the permanent magnets in the second rotating electric machine, and is configured as follows: when the first demagnetization determination means determines the demagnetization, the output of the second rotating electric machine is suppressed to continue the drive, and when the second demagnetization determination means determines the demagnetization, the output of the first rotating electric machine is suppressed to continue the drive.

[0011] According to the control device for a rotating electric machine disclosed herein, even if one of multiple rotating electric machines connected to a common power source experiences a decrease in output due to demagnetization of a permanent magnet, a control device for a rotating electric machine can be obtained that enables the rotating electric machine to continue operating without causing damage to components, etc.

[0012] 1 is a functional block diagram showing an overall configuration of a control device for a rotating electric machine according to Embodiment 1. FIG. 2 is a functional block diagram showing a configuration of a first control unit in the control device for a rotating electric machine according to Embodiment 1. FIG. 3 is a functional block diagram showing a configuration of a second control unit in the control device for a rotating electric machine according to Embodiment 1. FIG. 4 is a functional block diagram showing a configuration of a command adjustment unit in the control device for a rotating electric machine according to Embodiment 1. FIG. 5 is an explanatory diagram showing a limit torque characteristic for one rotating electric machine in a case where demagnetization has occurred in the other rotating electric machine in the control device for a rotating electric machine according to Embodiment 1. FIG. 6 is an explanatory diagram showing a limit torque characteristic for one rotating electric machine in a case where demagnetization has occurred in the one rotating electric machine in the control device for a rotating electric machine according to Embodiment 1. FIG. 7 is an explanatory diagram explaining output states of a first rotating electric machine and a second rotating electric machine during normal operation. FIG. 8 is an explanatory diagram explaining output states of the first rotating electric machine and the second rotating electric machine in a case where the second rotating electric machine is demagnetized. FIG. 9 is an explanatory diagram explaining output states of the first rotating electric machine and the second rotating electric machine in a case where the second rotating electric machine is demagnetized in the control device for a rotating electric machine according to Embodiment 1. 1 is an explanatory diagram illustrating an output state of a first rotating electric machine and a second rotating electric machine during normal operation; FIG. 2 is an explanatory diagram illustrating an output state of a first rotating electric machine and a second rotating electric machine when the first rotating electric machine is demagnetized; FIG. 3 is an explanatory diagram illustrating an output state of a first rotating electric machine and a second rotating electric machine when the first rotating electric machine is demagnetized, in a control device for a rotating electric machine according to embodiment 1; FIG. 4 is a block diagram illustrating a hardware configuration of a portion of the components in the control device for a rotating electric machine according to embodiment 1; and FIG. 5 is a functional block diagram illustrating an example configuration of a power supply in the control device for a rotating electric machine according to embodiment 1.

[0013] A control device for a rotating electric machine according to a first embodiment will be described below with reference to the drawings. The control device for a rotating electric machine according to the first embodiment will be described as a control device for a rotating electric machine that controls a first rotating electric machine for driving a vehicle and a second rotating electric machine for generating electricity in an EV (Electric Vehicle). However, the present disclosure is not limited to control devices for rotating electric machines in EVs and can be applied to other devices as well. Note that in each drawing, the same reference numerals indicate the same or corresponding parts.

[0014] Embodiment 1. Figure 1 is a functional block diagram showing the overall configuration of a control device for a rotating electric machine according to embodiment 1. In Figure 1, a control device 100 controls a first rotating electric machine 3 as a drive device for driving an EV vehicle, and a second rotating electric machine 4 as a generator for charging a battery as a power source 1 mounted on the EV. The first rotating electric machine 3 and the second rotating electric machine 4 receive power supply from a single common power source 1 and are controlled by the control device 100. The control device 100 is sometimes called a power converter because it has a power conversion function as described below, but here it will be called a control device.

[0015] The first rotating electric machine 3 and the second rotating electric machine 4 are, for example, permanent magnet type synchronous rotating electric machines, each having a rotor with field poles formed by permanent magnets and a stator with a three-phase stator winding as an armature winding consisting of U-phase, V-phase, and W-phase. The U-phase stator winding, V-phase stator winding, and W-phase stator winding of the first rotating electric machine 3 are connected to a U-phase terminal conductor U1, a V-phase terminal conductor V1, and a W-phase terminal conductor W1, respectively, which are derived from the first control unit 6. During normal operation, the first rotating electric machine 3 operates as an electric motor that drives a vehicle.

[0016] The U-phase stator winding, V-phase stator winding, and W-phase stator winding of the second rotating electric machine 4 are respectively connected to a U-phase terminal conductor U2, a V-phase terminal conductor V2, and a W-phase terminal conductor W2 that are derived from the second control unit 7. During normal operation, the second rotating electric machine 4 operates as a generator for charging the battery that serves as the power source 1.

[0017] A first rotation state detector 31 provided in the first rotating electric machine 3 detects the rotation speed N1 [rpm] and the electrical angular velocity ω1 [rad / s] of the rotor of the first rotating electric machine 3 and inputs them to the first control unit 6. A second rotation state detector 41 provided in the second rotating electric machine 4 detects the rotation speed N2 [rpm] and the electrical angular velocity ω2 [rad / s] of the rotor of the second rotating electric machine 4 and inputs them to the second control unit 7.

[0018] The power supply 1 is, for example, a large-capacity lithium-ion battery, but the power supply 1 may also include a boost converter. When the power supply 1 includes a boost converter, the control device 100 is configured to limit the output power of the boost converter to the minimum value of power that can be output by the power supply 1 and the boost converter. FIG. 10 is a functional block diagram showing an example of the configuration of the power supply in the control device for a rotating electric machine according to the first embodiment, illustrating an example of a configuration in which the power supply includes a boost converter. As shown in FIG. 10, the power supply 1 includes a battery 111, a boost converter 112, and minimum value selection means 113.

[0019] Here, assuming that the output power P111 [W] of the battery 111 is limited by the available output power P11 [W] and the output power P112 [W] of the boost converter 112 is limited by the available output power P12 [W], the power supply 1 is configured such that, in order to protect the components when the rotating electric machine is demagnetized, the output power P113 [W] of the power supply 1 is selected by minimum value selection means 113 from the output power P111 [W] of the battery 111 and the output power P112 [W] of the boost converter 112 so that the output power P113 [W] does not exceed the available output powers P11 [W] and P12 [W], and the selected output power is set as the output power P113 [W] of the power supply 1.

[0020] The control device 100 includes a command adjustment unit 5, a first control unit 6 for controlling the first rotating electric machine 3, and a second control unit 7 for controlling the second rotating electric machine. The command adjustment unit 5 generates a command torque τ1c [Nm] for the first rotating electric machine 3 by adjusting a first required torque τ1r [Nm] for the first rotating electric machine 3 that is input from outside the control device 100 in accordance with the operating state of the vehicle, and inputs the generated command torque τ1c [Nm] to the first control unit 6.

[0021] In addition, the command adjustment unit 5 generates a command torque τ2c [Nm] for the second rotating electric machine 4 by adjusting the second required torque τ2r [Nm] for the second rotating electric machine 4 input from outside the control device 100 in accordance with the operating state of the vehicle, and inputs the generated command torque τ2c [Nm] to the second control unit 7.

[0022] The first control unit 6 inputs the rotational speed N1 [rpm] and electrical angular speed ω1 [rad / s] of the rotor of the first rotating electric machine 3 detected by the first rotational state detector 31 to the command adjustment unit 5. The first control unit 6 also inputs a demagnetization determination flag F1 (described later) to the command adjustment unit 5. The second control unit 7 inputs the rotational speed N2 [rpm] and electrical angular speed ω2 [rad / s] of the rotor of the second rotating electric machine 4 detected by the second rotational state detector 41 to the command adjustment unit 5. The second control unit 7 also inputs a demagnetization determination flag F2 (described later) to the command adjustment unit 5.

[0023] 2 is a functional block diagram showing the configuration of a first control unit in the control device for a rotating electric machine according to Embodiment 1. In FIG. 2, the first control unit 6 has a first driving means 61, a first demagnetization determination means 62, and a first electric quantity detector 63. The first demagnetization determination means 62 includes a first estimator 621 and a first determiner 622. The first electric quantity detector 63 detects an armature current I1 [A] and a voltage Vi1 [V] of the first rotating electric machine 3.

[0024] The first drive means 61 includes a three-phase power conversion circuit (not shown) and a drive circuit (not shown) that drives semiconductor switching elements that constitute the three-phase power conversion circuit. The three-phase power conversion circuit is configured with a three-phase bridge circuit having a U-phase arm formed by a series connection of a U-phase upper arm semiconductor switching element and a U-phase lower arm semiconductor switching element, a V-phase arm formed by a series connection of a V-phase upper arm semiconductor switching element and a V-phase lower arm semiconductor switching element, and a W-phase arm formed by a series connection of a W-phase upper arm semiconductor switching element and a W-phase lower arm semiconductor switching element.

[0025] The U-phase terminal conductor U1 derived from the series connection portion of the U-phase upper arm semiconductor switching element and the U-phase lower arm semiconductor switching element is connected to the U-phase stator winding of the first rotating electric machine 3, the V-phase terminal conductor V1 derived from the series connection portion of the V-phase upper arm semiconductor switching element and the V-phase lower arm semiconductor switching element is connected to the V-phase stator winding of the first rotating electric machine 3, and the W-phase terminal conductor W1 derived from the series connection portion of the W-phase upper arm semiconductor switching element and the W-phase lower arm semiconductor switching element is connected to the W-phase stator winding of the first rotating electric machine 3.

[0026] During normal operation, the drive circuit in the first drive means 61 controls the switching of each semiconductor switching element, for example, by PWM (Pulse Width Modulation), so that the three-phase power conversion circuit operates as an inverter, thereby causing the first rotating electric machine 3 to operate as an electric motor for driving the vehicle.

[0027] The first estimator 621 in the first demagnetization determination means 62 calculates the magnetic flux amount of the permanent magnet that constitutes the field pole of the first rotating electric machine 3 based on the following equations (1), (2), and (3), and outputs the calculated amount as an estimated magnetic flux amount Φ1 [Wb].

[0028]

[0029] In equation (1), Φ DC is a steady term and is calculated by the following equation (2).

[0030] Also, in equation (1), Φ DIV is a differential term and is calculated by the following equation (3).

[0031] Here, ω is the electrical angular velocity ω1 [rad / s] of the rotor of the first rotating electric machine 3 detected by the first rotation state detector 31. d , I q are the d-axis current component and the q-axis current component of the armature current calculated using the armature current I1 [A] and the electrical angular velocity ω1 [rad / s] of the first rotating electric machine 3 detected by the first electric quantity detector 63. R is the resistance value [Ω] of the first rotating electric machine 3. Vq is the q-axis voltage command value for the first rotating electric machine 3. L d , L q are the d-axis inductance component and the q-axis inductance component of the first rotating electrical machine 3 derived from pre-stored information. K is a correction coefficient.

[0032] The amount of magnetic flux of the permanent magnet of the first rotating electric machine 3 may be estimated by a method other than the above calculation.

[0033] The first determiner 622 in the first demagnetization determination means 62 is configured to determine whether demagnetization has occurred in the permanent magnet of the first rotating electric machine 3 by comparing the estimated magnetic flux amount Φ1 [Wb] of the permanent magnet of the first rotating electric machine 3 estimated by the first estimator 621 with a preset threshold value Φth [Wb] (not shown), and when the estimated magnetic flux amount Φ1 [Wb] is smaller than the threshold value Φth [Wb], it determines that demagnetization has occurred in the permanent magnet of the first rotating electric machine 3 and outputs a demagnetization determination flag F1.

[0034] 3 is a functional block diagram showing the configuration of a second control unit in the control device for a rotating electric machine according to Embodiment 1. In FIG. 3, the second control unit 7 has a second driving means 71, a second demagnetization determination means 72, and a second electric quantity detector 73. The second demagnetization determination means 72 includes a second estimator 721 and a second determiner 722. The second electric quantity detector 73 detects the armature current I2 [A] and voltage Vi2 [V] of the second rotating electric machine 4.

[0035] The second drive means 71 includes a three-phase power conversion circuit (not shown) and a drive circuit (not shown) that drives the semiconductor switching elements that constitute the power conversion circuit. The three-phase power conversion circuit is configured with a three-phase bridge circuit having a U-phase arm formed by a series connection of a U-phase upper arm semiconductor switching element and a U-phase lower arm semiconductor switching element, a V-phase arm formed by a series connection of a V-phase upper arm semiconductor switching element and a V-phase lower arm semiconductor switching element, and a W-phase arm formed by a series connection of a W-phase upper arm semiconductor switching element and a W-phase lower arm semiconductor switching element.

[0036] The U-phase terminal conductor U2 derived from the series connection portion of the U-phase upper arm semiconductor switching element and the U-phase lower arm semiconductor switching element is connected to the U-phase stator winding of the second rotating electric machine 4, the V-phase terminal conductor V2 derived from the series connection portion of the V-phase upper arm semiconductor switching element and the V-phase lower arm semiconductor switching element is connected to the V-phase stator winding of the second rotating electric machine 4, and the W-phase terminal conductor W2 derived from the series connection portion of the W-phase upper arm semiconductor switching element and the W-phase lower arm semiconductor switching element is connected to the W-phase stator winding of the second rotating electric machine 4.

[0037] During normal operation, the drive circuit in the second drive means 71 controls the switching of each semiconductor switching element so that the three-phase power conversion circuit operates as a converter, whereby the second rotating electric machine 4 operates as a generator that charges the battery serving as the power source 1.

[0038] The second estimator 721 in the second demagnetization determination means 72 calculates the magnetic flux amount of the permanent magnet that constitutes the field magnetic pole of the second rotating electric machine 4 based on the above-mentioned equations (1), (2), and (3), and outputs the calculated amount as an estimated magnetic flux amount Φ2 [Wb].

[0039] In the above equations (1), (2), and (3), ω is the electrical angular velocity ω2 [rad / s] of the rotor of the second rotating electric machine 4 detected by the second rotation state detector 41. d , I q are the d-axis current component and the q-axis current component of the armature current calculated using the armature current I2 [A] and the electrical angular velocity ω2 [rad / s] of the second rotating electric machine 4 detected by the second electric quantity detector 73. R is the resistance value [Ω] of the second rotating electric machine 4. V q is the q-axis voltage command value for the second rotating electric machine 4. L d , L q are the d-axis inductance component and the q-axis inductance component of the second rotating electric machine 4 derived from pre-stored information. K is a correction coefficient.

[0040] The amount of magnetic flux of the permanent magnet of the second rotating electric machine 4 may be estimated by a method other than the above calculation.

[0041] The second determiner 722 in the second demagnetization determination means 72 is configured to determine whether demagnetization has occurred in the permanent magnet of the second rotating electric machine 4 by comparing the estimated magnetic flux amount Φ2 [Wb] of the permanent magnet of the second rotating electric machine 4 estimated by the second estimator 721 with a preset threshold value Φth [Wb] (not shown), and when the estimated magnetic flux amount Φ2 [Wb] is smaller than the threshold value Φth [Wb], it determines that demagnetization has occurred in the permanent magnet of the second rotating electric machine 4 and outputs a demagnetization determination flag F2.

[0042] Fig. 4 is a functional block diagram showing the configuration of a command adjustment unit in the control device for a rotating electric machine according to embodiment 1. In Fig. 4, command adjustment unit 5 includes first output calculation means 51, second output calculation means 52, adjustment means 53, first limiting means 54, and second limiting means 55.

[0043] The first output calculation means 51 calculates an estimated output P1 [W] of the first rotating electric machine 3 using a general formula for calculating the mechanical output of a rotating electric machine that uses the rotation speed and torque of the rotating electric machine, based on the command torque τ1c [Nm] for the first rotating electric machine 3 input from the first limiting means 54 and the rotation speed N1 [rpm] of the first rotating electric machine 3 input from the first rotation state detector 31, and inputs the calculated estimated output P1 [W] to the adjustment means 53. Note that the estimated output P1 [W] may be generated by a method other than the above.

[0044] The second output calculation means 52 calculates an estimated output P2 [W] of the second rotating electric machine 4 using a general formula for calculating the mechanical output of a rotating electric machine that uses the rotation speed and torque of the rotating electric machine, based on the command torque τ2c [Nm] for the second rotating electric machine 4 input from the second limiting means 55 and the rotation speed N2 [rpm] of the second rotating electric machine 4 input from the second rotation state detector 41, and inputs the calculated estimated output P2 [W] to the adjustment means 53. Note that the estimated output P2 [W] may be generated by a method other than the above.

[0045] The adjusting means 53 calculates an available output power P0 [W] (not shown) that can be output by the power supply 1, based on the rated voltage Vs [V] and rated current Is [A] of the power supply 1. The adjusting means 53 also derives an available output torque τ1p [Nm] for limiting the output of the first rotating electric machine 3, based on the estimated output P2 [W] of the second rotating electric machine 4 input from the second output calculating means 52 and the available output power P0 [W] of the power supply 1, and inputs this to the first limiting means 54.

[0046] Furthermore, the adjustment means 53 derives the output torque τ2p [Nm] for limiting the output of the second rotating electric machine 4 based on the estimated output P1 [W] of the first rotating electric machine 3 input from the first output calculation means 51 and the output power P0 [W] of the power source 1, and inputs it to the second limiting means 55.

[0047] Next, the first limiting means 54 will be described. The first limiting means 54 is configured to receive the required torque τ1r [Nm] for the first rotating electric machine 3 input from outside the control device 100, the demagnetization determination flag F1 input from the first demagnetization determination means 62 of the first control unit 6, the demagnetization determination flag F2 input from the second demagnetization determination means 72 of the second control unit 7, the rotational speed N1 [rpm] of the first rotating electric machine 3 input from the first rotation state detector 31, and the available output torque τ1p [Nm] input from the adjustment means 53.

[0048] When demagnetization occurs in the permanent magnet of the second rotating electric machine 4 and the demagnetization determination flag F2 is input, the first limiting means 54 outputs the smaller torque value of the limit torque τ1s1 [Nm] (not shown) set for the first rotating electric machine 3 based on Fig. 5 described later and the possible output torque τ1p [Nm] input from the adjusting means 53 as the command torque τ1c for the first rotating electric machine 3. In other words, the required torque τ1r [Nm] is limited to the smaller torque value of the limit torque τ1s1 [Nm] and the possible output torque τ1p [Nm], and the value of the limited torque is output as the command torque τ1c for the first rotating electric machine.

[0049] Now, Fig. 5 will be described. Fig. 5 is an explanatory diagram showing the torque limit characteristics for one rotating electric machine in the control device for a rotating electric machine according to embodiment 1 when demagnetization occurs in the other rotating electric machine, and shows a method for suppressing the output of a rotating electric machine for which demagnetization has not been determined. When the permanent magnets of the rotating electric machine are demagnetized, the torque of the rotating electric machine decreases, and therefore the actual output of the rotating electric machine decreases.

[0050] On the other hand, the first output calculation means 51 described above generates an estimated output P1 by estimating the output of the first rotating electric machine 3 from the command torque τ1c for the first rotating electric machine 3, and therefore a mismatch occurs between the estimated output P1 and the actual output of the first rotating electric machine 3. Furthermore, the second output calculation means 52 described above generates an estimated output P2 by estimating the output of the second rotating electric machine 4 from the command torque τ2c for the second rotating electric machine 4, and therefore a mismatch occurs between the estimated output P2 and the actual output of the second rotating electric machine 4.

[0051] Therefore, due to the above mismatch, there is a possibility that more power than expected will flow from the power supply 1 or more current than expected will flow into the power supply 1, which may damage components such as the power supply 1, or it may be necessary to detect an overcurrent in the power supply 1 and stop the operation of the first rotating electric machine 3 or the second rotating electric machine 4, or both.

[0052] Therefore, in the control device for a rotating electric machine according to the first embodiment, it is detected that the permanent magnet of the other rotating electric machine has been demagnetized based on the demagnetization determination flag F1 or the demagnetization determination flag F2, and a torque that limits the required torque τ1r or the required torque τ2r is provided in advance in the first limiting means 54 as a limit torque τ1s1, and in the second limiting means 55 as a limit torque τ2s1, so that the one rotating electric machine for which demagnetization has not been detected can be driven using only the power from the power source 1. Specifically, the first limiting means 54 and the second limiting means 55 are provided with limit torques τ1s1 and τ2s1 that set upper limits of torque for each rotational speed of one rotating electric machine so that the output of one rotating electric machine is suppressed when the other rotating electric machine is demagnetized.

[0053] 5 , if one rotating electric machine where demagnetization has not occurred is referred to as the first rotating electric machine 3 and the other rotating electric machine where demagnetization has occurred is referred to as the second rotating electric machine 4, the vertical axis represents the torque [Nm] of the first rotating electric machine 3 and the horizontal axis represents the rotation speed [rpm] of the first rotating electric machine 3. In this case, T0 represents the torque characteristics for the first rotating electric machine 3 in normal times when no demagnetization has occurred in the second rotating electric machine 4, and T1 represents the characteristic curve of the limit torque for the first rotating electric machine 3 when demagnetization has occurred in the second rotating electric machine 4.

[0054] 5 , if one rotating electric machine in which demagnetization has not occurred is the second rotating electric machine 4 and the other rotating electric machine in which demagnetization has occurred is the first rotating electric machine 3, the vertical axis represents the torque [Nm] of the second rotating electric machine 4 and the horizontal axis represents the rotation speed [rpm] of the second rotating electric machine 4. In this case, T0 represents the characteristic of the limit torque for the second rotating electric machine 4 in normal times when no demagnetization has occurred in the first rotating electric machine 3, and T1 represents the characteristic curve of the limit torque for the second rotating electric machine 4 when demagnetization has occurred in the first rotating electric machine 3.

[0055] 4, when the demagnetization determination flag F2 is input from the second demagnetization determination means 72, this means that demagnetization has occurred in the second rotating electric machine 4, which serves as the other rotating electric machine in FIG. 5 described above, and the first limiting means 54 sets a limit torque τ1s1 [Nm] for the first rotating electric machine 3, which serves as one rotating electric machine, in accordance with the rotation speed N1 [rpm] of the first rotating electric machine 3, based on the limit torque characteristic curve T1 shown in FIG. 5. As described above, the first limiting means 54 inputs the smaller torque value of the limit torque τ1s1 and the outputtable torque τ1p [Nm] input from the adjustment means 53 as a command torque τ1c for the first rotating electric machine to the first control unit 6 shown in FIG.

[0056] Next, when demagnetization occurs in the permanent magnet of the first rotating electric machine 3 and the demagnetization determination flag F1 is input, the first limiting means 54 outputs the smaller torque value of the limit torque τ1s2 [Nm] (not shown) set for the first rotating electric machine 3 based on Fig. 6 described later and the possible output torque τ1p [Nm] input from the adjusting means 53 as the command torque τ1c for the first rotating electric machine 3. In other words, the required torque τ1r [Nm] is limited to the smaller torque value of the limit torque τ1s2 [Nm] and the possible output torque τ1p [Nm], and the value of the limited torque is input to the first control unit 6 shown in Fig. 1 as the command torque τ1c for the first rotating electric machine 3.

[0057] Now, Fig. 6 will be described. Fig. 6 is an explanatory diagram showing the limited torque characteristics for one of the rotating electric machines when demagnetization occurs in the one of the rotating electric machines in the control device for the rotating electric machine according to embodiment 1. When the permanent magnets of the rotating electric machine are demagnetized, the characteristics of the rotating electric machine change, and the peak of the phase current flowing in the armature winding, i.e., the peak of the armature current, increases, which may be detected as an overcurrent.

[0058] Therefore, in the control device for a rotating electric machine according to the first embodiment, demagnetization of the permanent magnet of the rotating electric machine is detected from the demagnetization determination flag F1 or the demagnetization determination flag F2, and torques that limit the required torque τ1r or the required torque τ2r so that the rotating electric machine that has detected demagnetization can be driven at a level that is not detected as an overcurrent are provided in advance in the first limiting means 54 and the second limiting means 55 as limit torques τ1s2 [Nm] and τ2s2 [Nm] (neither of which is shown). Specifically, the first limiting means 54 and the second limiting means 55 are provided with limit torques τ1s2 [Nm] and τ2s2 [Nm] that suppress the maximum torque compared to that during normal operation so that the maximum torque is suppressed when the rotating electric machine is demagnetized.

[0059] Here, the limit torque τ1s2 [Nm] is a torque value at a level at which the armature current of the first rotating electric machine 3 in which demagnetization has occurred is not detected as an overcurrent, and the limit torque τ2s2 [Nm] is a torque value at a level at which the armature current of the second rotating electric machine 4 in which demagnetization has occurred is not detected as an overcurrent. In other words, when the first demagnetization determination means 62 determines demagnetization, the torque of the first rotating electric machine is suppressed so as to prevent an overcurrent from occurring in the first rotating electric machine 3, and when the second demagnetization determination means 72 determines demagnetization, the torque of the second rotating electric machine is suppressed so as to prevent an overcurrent from occurring in the second rotating electric machine.

[0060] 6 , if one of the rotating electric machines in which demagnetization has occurred is the first rotating electric machine 3, the vertical axis represents the torque [Nm] of the first rotating electric machine 3, and the horizontal axis represents the rotation speed [rpm] of the first rotating electric machine 3. In this case, T0 represents the torque characteristics for the first rotating electric machine 3 during normal operation when no demagnetization has occurred in the first rotating electric machine 3, and T1 represents the characteristic curve of the limit torque for the first rotating electric machine 3 when demagnetization has occurred in the first rotating electric machine 3.

[0061] 6 , if one of the rotating electric machines in which demagnetization has occurred is the second rotating electric machine 4, the vertical axis represents the torque [Nm] of the second rotating electric machine 4, and the horizontal axis represents the rotation speed [rpm] of the second rotating electric machine 4. In this case, T0 represents the torque characteristics for the second rotating electric machine 4 during normal operation when no demagnetization has occurred in the second rotating electric machine 4, and T2 represents the characteristic curve of the limit torque for the second rotating electric machine 4 when demagnetization has occurred in the second rotating electric machine 4.

[0062] 4, when the first limiting means 54 receives the demagnetization determination flag F1 from the first demagnetization determination means 62, it sets the limit torque τ1s2 [Nm] for the first rotating electric machine 3 based on the limit torque characteristic curve T2 shown in Fig. 6 and in accordance with the rotation speed N1 [rpm] of the first rotating electric machine 3. As described above, the first limiting means 54 inputs the smaller torque value of the limit torque τ1s2 and the outputtable torque τ1p [Nm] received from the adjusting means 53 as the command torque τ1c for the first rotating electric machine 3 to the first control unit 6 shown in Fig. 1.

[0063] When demagnetization has not occurred in either the first rotating electric machine 3 or the second rotating electric machine 4 and neither the demagnetization judgment flag F1 nor the demagnetization judgment flag F2 is input, the first limiting means 54 outputs a value obtained by limiting the required torque τ1r [Nm] for the first rotating electric machine 3 by the outputtable torque τ1p generated based on the estimated output P1 [W] as a command torque τ1c for the first rotating electric machine 3 and inputs it to the first control unit 6.

[0064] Next, the second limiting means 55 will be described. In Fig. 4, the second limiting means 55 is configured to receive the required torque τ2r [Nm] for the second rotating electric machine 4 input from outside the control device 100, the demagnetization determination flag F2 input from the second demagnetization determination means 72 of the second control unit 7, the demagnetization determination flag F1 input from the first demagnetization determination means 62 of the first control unit 6, the rotation speed N2 [rpm] of the second rotating electric machine 4 input from the second rotation state detector 41, and the available output torque τ2p [Nm] input from the adjustment means 53.

[0065] When demagnetization occurs in the permanent magnet of the first rotating electric machine 3 and the demagnetization determination flag F1 is input, the second limiting means 55 outputs the smaller torque value of the limit torque τ2s1 [Nm] set for the second rotating electric machine 4 based on the above-mentioned Fig. 5 and the possible output torque τ2p [Nm] input from the adjusting means 53 as the command torque τ2c for the second rotating electric machine 4. In other words, the required torque τ2r [Nm] is limited to the smaller torque value of the limit torque τ2s1 [Nm] and the possible output torque τ2p [Nm], and the value of the limited torque is input to the second control unit 7 shown in Fig. 1 as the command torque τ2c for the second rotating electric machine 4.

[0066] Next, when demagnetization occurs in the permanent magnet of the second rotating electric machine 4 and the demagnetization determination flag F2 is input, the second limiting means 55 sets the limit torque τ2s2 [Nm] for the second rotating electric machine 4 based on the limit torque characteristic curve T2 shown in Fig. 6 and in accordance with the rotation speed N2 [rpm] of the second rotating electric machine 4. As described above, the second limiting means 55 inputs the smaller torque value of the limit torque τ2s2 and the outputtable torque τ2p [Nm] input from the adjusting means 53 as the command torque τ2c for the second rotating electric machine 4 to the first control unit 6 shown in Fig. 1.

[0067] When demagnetization has not occurred in either the first rotating electric machine 3 or the second rotating electric machine 4 and neither the demagnetization judgment flag F1 nor the demagnetization judgment flag F2 is input, the second limiting means 55 outputs a value obtained by limiting the required torque τ2r [Nm] for the second rotating electric machine 4 by the outputtable torque τ2p generated based on the estimated output P2 [W] as a command torque τ2c for the second rotating electric machine 4 and inputs it to the second control unit 7.

[0068] Next, the operation of the control device for a rotating electric machine according to the first embodiment configured as described above will be described. During so-called normal operation, in which demagnetization has not occurred in either the first rotating electric machine 3 or the second rotating electric machine 4 and neither the demagnetization determination flag F1 nor the demagnetization determination flag F2 has been generated, the first limiting means 54 outputs a value obtained by limiting the required torque τ1r [Nm] for the first rotating electric machine 3 by the available output torque τ1p generated based on the estimated output P1 [W] as a command torque τ1c for the first rotating electric machine 3 and inputs this value to the first control unit 6. As a result, the first rotating electric machine 3 is controlled by the first control unit 6 to operate as an electric motor that generates a torque that follows the command torque τ1c, for example, to drive a vehicle.

[0069] Furthermore, during so-called normal operation when demagnetization has not occurred in either the first rotating electric machine 3 or the second rotating electric machine 4 and neither the demagnetization determination flag F1 nor the demagnetization determination flag F2 has been generated, the second limiting means 55 outputs a value obtained by limiting the required torque τ2r [Nm] for the second rotating electric machine 4 by the available output torque τ2p generated based on the estimated output P2 [W] as a command torque τ2c for the second rotating electric machine 4 and inputs this value to the second control unit 7. As a result, the second rotating electric machine 4 is controlled by the second control unit 7 to operate as a generator of torque that follows the command torque τ2c, and generates power to charge, for example, a battery serving as the power source 1.

[0070] Next, we will explain the operation when demagnetization occurs in the permanent magnet of the second rotating electric machine 4 when the output of the second rotating electric machine 4 as a generator is smaller than the output of the first rotating electric machine 3 as an electric motor.

[0071] 7A is an explanatory diagram illustrating the output states of the first rotating electric machine and the second rotating electric machine during normal operation, FIG. 7B is an explanatory diagram illustrating the output states of the first rotating electric machine and the second rotating electric machine when the second rotating electric machine is demagnetized, and FIG. 7C is an explanatory diagram illustrating the output states of the first rotating electric machine and the second rotating electric machine when the second rotating electric machine is demagnetized in the rotating electric machine control device according to Embodiment 1. In FIG. 7A, FIG. 7B, and FIG. 7C, the vertical axis represents output [W], A and A1 are schematic representations of the output of the first rotating electric machine 3 as an electric motor, B and B1 are schematic representations of the output of the second rotating electric machine 4 as a generator, and C, C1, and C2 are schematic representations of the power of the power source 1.

[0072] As shown in Figure 7A, during normal operation when no demagnetization occurs in the permanent magnets of either rotating electric machine, the output A of the first rotating electric machine 3 is greater than the power C supplied from the power source 1, so the power deficiency is compensated for by the output B of the second rotating electric machine 4.

[0073] Next, if demagnetization occurs in the permanent magnet of the second rotating electric machine 4, the torque of the second rotating electric machine 4 will decrease, and the output of the second rotating electric machine 4 will become an output B1 that is lower than the normal output B, as shown in Fig. 7B. On the other hand, the second output calculation means 52 estimates the output of the second rotating electric machine 4 based on the command torque τ2c [Nm] for the second rotating electric machine 4, and therefore cannot calculate an estimated output P2 that reflects the decrease in the output of the second rotating electric machine 4.

[0074] Therefore, the adjusting unit 53 determines that the first rotating electric machine 3 can be driven normally, the command torque τ1c [Nm] remains unchanged from that during normal operation, and the output of the first rotating electric machine 3 remains at the output A during normal operation. Therefore, if the first embodiment shown in FIG. 7B is not applied, the power shortage caused by the demagnetization of the permanent magnet of the second rotating electric machine 4 is compensated for by the power C1 [W] of the power supply 1, and the power output from the power supply 1 becomes the power C1 [W] that is higher than the power C [W] during normal operation. This causes more power than expected to flow from the power supply 1, which may cause the rotating electric machine to stop operating or damage its components by detecting an overcurrent in the power supply 1.

[0075] In contrast to this, in the control device for a rotating electric machine according to embodiment 1, the command torque τ1c [Nm] is limited as described above by the first limiting means 54 based on the demagnetization judgment flag F2 output by the second demagnetization judgment means 72 in the second control unit 7 when determining whether or not the permanent magnet of the second rotating electric machine 4 has been demagnetized. As a result, the output of the first rotating electric machine 3 driven by the first driving means 61 is reduced from the output A [W] during normal operation to the output A1 [W] as shown in FIG. 7C.

[0076] When the permanent magnet of the second rotating electric machine 4 is demagnetized, as described above with reference to Fig. 5, based on the demagnetization determination flag F2, the output of the first rotating electric machine 3 is suppressed by the upper torque limit value set in advance for each rotation speed when the second rotating electric machine 4 as the other rotating electric machine is demagnetized, so that the first rotating electric machine 3 can be driven only by the output C2 of the power source 1 shown in Fig. 7C. As a result, it is possible to prevent drive stop or damage to components due to overcurrent detection of the power source 1 caused by power flowing out of the power source 1 more than expected.

[0077] Furthermore, based on the demagnetization judgment flag F2, as explained above with reference to Figure 6, by limiting the maximum torque of the second rotating electric machine 4 when the second rotating electric machine 4 is demagnetized to a torque that is suppressed in advance from that during normal operation, the output of the second rotating electric machine 4 decreases from the output B during normal operation shown in Figure 7C to output B1, thereby preventing detection of an overcurrent in the power supply 1 and allowing the second rotating electric machine 4 to continue operating.

[0078] As described above, according to the control device for a rotating electric machine according to embodiment 1, even if the permanent magnet of the second rotating electric machine 4 is demagnetized, the first rotating electric machine 3 and the second rotating electric machine 4 can be continuously driven without damaging the components, thereby extending the vehicle's cruising range.

[0079] Next, we will explain the operation when demagnetization occurs in the permanent magnet of the first rotating electric machine 3 when the output of the first rotating electric machine 3 as an electric motor is smaller than the output of the second rotating electric machine 4 as a generator.

[0080] 8A is an explanatory diagram illustrating the output states of the first rotating electric machine and the second rotating electric machine during normal operation, FIG. 8B is an explanatory diagram illustrating the output states of the first rotating electric machine and the second rotating electric machine when the first rotating electric machine is demagnetized, and FIG. 8C is an explanatory diagram illustrating the output states of the first rotating electric machine and the second rotating electric machine when the first rotating electric machine is demagnetized in the rotating electric machine control device according to Embodiment 1. In FIG. 8A, FIG. 8B, and FIG. 8C, the vertical axis represents output [W], A and A1 are schematic representations of the output of the first rotating electric machine 3 as an electric motor, B and B1 are schematic representations of the output of the second rotating electric machine 4 as a generator, and C, C1, and C2 are schematic representations of the power of the power source 1.

[0081] As shown in Figure 8A, during normal operation when no demagnetization occurs in the permanent magnets of either rotating electric machine, the output B of the second rotating electric machine 4 is greater than the power C supplied from the power source 1, so the power shortage due to the output A of the first rotating electric machine 3 is compensated for by the output B of the second rotating electric machine 4.

[0082] Next, if demagnetization occurs in the permanent magnet of the first rotating electric machine 3, the output of the first rotating electric machine 3 becomes an output A1 that is lower than the output A during normal operation, as shown in Fig. 8B. On the other hand, the first output calculation means 51 estimates the output of the first rotating electric machine 3 based on the command torque τ1c [Nm] for the first rotating electric machine 3, and therefore cannot calculate an estimated output P1 that reflects the decrease in the output of the first rotating electric machine 3.

[0083] Therefore, the adjusting means 53 determines that the second rotating electric machine 4 can be driven normally, the command torque τ2c [Nm] remains unchanged from normal operation, and the output of the second rotating electric machine 4 remains at the output B during normal operation. Therefore, if the first embodiment shown in FIG. 8B is not applied, the excess power of the second rotating electric machine 4 due to the demagnetization of the first rotating electric machine 3 is regenerated to the power supply 1, and the power of the power supply 1 becomes power C1, which is higher than the power C during normal operation. As a result, if more power than expected flows into the power supply 1, an overcurrent of the power supply 1 may be detected, causing the rotating electric machine to stop operating or damaging its components.

[0084] In contrast to this, in the control device for a rotating electric machine according to embodiment 1, the command torque τ2c [Nm] is limited as described above by the second limiting means 55 based on the demagnetization judgment flag F1 output by the first demagnetization judgment means 62 in the first control unit 6 when determining whether or not the permanent magnet of the first rotating electric machine 3 has been demagnetized. As a result, the output of the second rotating electric machine 4 driven by the second driving means 71 is reduced from the output B [W] during normal operation to the output B1 [W] as shown in FIG. 8C.

[0085] When the permanent magnet of the first rotating electric machine 3 is demagnetized, as described above with reference to Fig. 5 , based on the demagnetization determination flag F1, the output of the second rotating electric machine 4 is suppressed by the upper torque limit value set in advance for each rotation speed when the first rotating electric machine 3 serving as the other rotating electric machine is demagnetized, and the first rotating electric machine 3 can be driven by the output C2 of the power source 1 and the suppressed output B1 of the second rotating electric machine 4 shown in Fig. 8C . As a result, it is possible to prevent drive stop or damage to components due to overcurrent detection of the power source 1 caused by power flowing into the power source 1 more than expected.

[0086] Furthermore, based on the demagnetization judgment flag F1, as explained above in Figure 6, by limiting the maximum torque of the first rotating electric machine 3 when the first rotating electric machine 3 is demagnetized to a torque that is suppressed in advance from normal operation, the output of the first rotating electric machine 3 decreases from the output A during normal operation shown in Figure 8C to output A1, so that the first rotating electric machine 3 can be continuously driven.

[0087] As described above, according to the control device for a rotating electric machine according to embodiment 1, even if the permanent magnet of the first rotating electric machine 3 is demagnetized, the first rotating electric machine 3 and the second rotating electric machine 4 can be continuously driven without damaging the components, and the vehicle can continue to run.

[0088] In the control device for a rotating electric machine according to the first embodiment described above, the command adjustment unit 5, at least the first demagnetization determination means 62 in the first control unit 6, and at least the second demagnetization determination means 72 in the second control unit 7 can be configured by an ECU (Electronic Control Unit).

[0089] 9 is a block diagram showing the hardware configuration of a portion of the components in the control device for a rotating electric machine according to the first embodiment, illustrating the hardware configuration of the ECU. In FIG. 9, the ECU 1000 is composed of a processor 1001 and a storage device 1002. The storage device 1002 includes a volatile storage device such as a random access memory and a non-volatile auxiliary storage device such as a flash memory. Note that a hard disk auxiliary storage device may be used instead of the flash memory.

[0090] The processor 1001 executes a program input from the storage device 1002. In this case, the program is input from the auxiliary storage device to the processor 1001 via the volatile storage device. The processor 1001 may also output data such as calculation results to the volatile storage device of the storage device 1002, or may store the data in the auxiliary storage device via the volatile storage device.

[0091] The control device for a rotating electric machine according to the first embodiment described above includes a plurality of rotating electric machines supplied with power from a common power source, the rotating electric machines including at least one rotating electric machine used for driving and at least one rotating electric machine used for generating electricity, and a demagnetization determination means for determining demagnetization of a permanent magnet of at least one of the plurality of rotating electric machines, and is configured such that, when demagnetization of one of the driving rotating electric machines or the generating rotating electric machine is determined, the output of the driving rotating electric machine or the generating rotating electric machine for which demagnetization has not been determined is suppressed, thereby continuing to drive the rotating electric machines. With this configuration, the rotating electric machines can be continuously driven even after demagnetization of the permanent magnet of one of the rotating electric machines occurs.

[0092] In the control device for a rotating electric machine according to the first embodiment, the demagnetization determination means is configured to suppress the torque of the rotating electric machine for which it has been determined that the permanent magnets have been demagnetized to a level that does not cause an overcurrent. With this configuration, when the permanent magnets of the rotating electric machine are demagnetized, the characteristics of the rotating electric machine change, making it possible to prevent an overcurrent caused by an increase in the peak of the phase current flowing through the armature winding.

[0093] Furthermore, in the rotating electric machine control device according to the first embodiment, the demagnetization determination means is configured to suppress the output of the rotating electric machine, for which demagnetization of the permanent magnets has not been determined, to a level that allows the rotating electric machine to be driven only by the power supplied from the power source. With this configuration, a mismatch between the actual output and the estimated output of the rotating electric machine, for which the permanent magnets have been demagnetized, will not cause current to flow in or out of the power source due to a shortage or excess of power, thereby preventing drive stop or damage to components due to detection of an overcurrent in the power source.

[0094] Furthermore, in the control device for a rotating electric machine according to the first embodiment, the demagnetization determination means is configured to suppress the output of the rotating electric machine, for which demagnetization of the permanent magnet has not been determined, to a value that is the minimum of the power that can be output, when the power supply that supplies power to the rotating electric machine is composed of a plurality of devices such as a battery and a boost converter. With this configuration, even when the power supply is composed of a plurality of devices such as a battery and a boost converter, a mismatch between the actual output and the estimated output of the rotating electric machine, for which the permanent magnet has been demagnetized, will not cause current to flow out or in from the power supply due to a shortage or excess of power, and it will be possible to prevent drive stoppage due to detection of an overcurrent in the power supply, damage to components, etc.

[0095] Furthermore, in the control device for a rotating electric machine according to the first embodiment, a first rotating electric machine, a second rotating electric machine, and a power supply are mounted on a vehicle, the first rotating electric machine operates as an electric motor that drives the vehicle, and the second rotating electric machine operates as a generator that charges the power supply, and when the second demagnetization determination means determines the demagnetization, the output of the first rotating electric machine is suppressed so that the vehicle can continue to run. With this configuration, even after the permanent magnets of the driving rotating electric machine are demagnetized, the rotating electric machine can be continuously driven, thereby allowing the vehicle to continue running.

[0096] In addition, in the control device for a rotating electric machine according to the first embodiment, a first rotating electric machine, a second rotating electric machine, and a power supply are mounted on a vehicle, the first rotating electric machine operates as an electric motor that drives the vehicle, the second rotating electric machine operates as a generator that charges the power supply, and when the first demagnetization determination means determines the demagnetization, the output of the second rotating electric machine is suppressed so that the cruising range of the vehicle charged with the power supply can be extended. With this configuration, by continuing to drive the second rotating electric machine for generating electricity even after the permanent magnet of the second rotating electric machine is demagnetized, the cruising range of the vehicle can be extended more than when it is driven only by the power supply.

[0097] Although exemplary embodiments are described in the present disclosure, the various features, aspects, and functions described in the embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are anticipated within the scope of the technology of the present disclosure. For example, variations in, addition to, or omission of at least one component are included.

[0098] REFERENCE SIGNS LIST 100 control device, 1 power supply, 111 battery, 112 boost converter, 113 minimum value selection means, 3 first rotating electric machine, 31 first rotation state detector, 4 second rotating electric machine, 41 second rotation state detector, 5 command adjustment unit, 51 first output calculation means, 52 second output calculation means, 53 adjustment means, 54 first limiting means, 55 second limiting means, 6 first control unit, 61, 71 driving means, 62 first demagnetization determination means, 621 first estimator, 622 first determiner, 63 first electric quantity detector, 7 second control unit, 71 second driving means, 72 second demagnetization determination means, 721 second estimator, 722 second determiner, 73 second electric quantity detector, U1, U2 U-phase terminal conductor, V1, V2 V-phase terminal conductor, W1, W2 W-phase terminal conductor, Vs Rated voltage, Is Rated current, I1, I2 Armature current, Vi1, Vi2 Voltage, N1, N2 Rotational speed, ω1, ω2 Electrical angular velocity, τ1r, τ2r Required torque, τ1c, τ2c Command torque, τ1p, τ2p Available output torque, τ1s1, τ1s2, τ2s1, τ2s2 Limit torque, F1, F2 Demagnetization judgment flag, Φ1, Φ2 Estimated magnetic flux amount, P0, P11, P12 Available output power, P1, P2 Estimated output, P111, P112, P113 Output power

Claims

1. At least one first rotating electrical machine including a field magnetic pole composed of a permanent magnet and an armature winding that generates a magnetic flux interlinking with the field magnetic pole, and operating as an electric motor; at least one second rotating electrical machine including a field magnetic pole composed of a permanent magnet and an armature winding that generates a magnetic flux interlinking with the field magnetic pole, and operating as a generator; a control device for the rotating electrical machines that are connected to a common power source and driven, the control device including: a first demagnetization determination means for determining demagnetization of the permanent magnet in the first rotating electrical machine; and a second demagnetization determination means for determining demagnetization of the permanent magnet in the second rotating electrical machine, wherein when the first demagnetization determination means determines the demagnetization, the output of the second rotating electrical machine is suppressed and the driving is continued, and when the second demagnetization determination means determines the demagnetization, the output of the first rotating electrical machine is suppressed and the driving is continued. A control device for a rotating electrical machine, characterized in that it is configured as described above.

2. The first rotating electrical machine, the second rotating electrical machine, and the power source are mounted on a vehicle, the first rotating electrical machine operates as an electric motor for driving the vehicle, the second rotating electrical machine operates as a generator for charging the power source, and when the first demagnetization determination means or the second demagnetization determination means determines the demagnetization, the output of the first rotating electrical machine is suppressed so that the vehicle can continue to run. The control device for a rotating electrical machine according to claim 1, characterized in that it is configured as described above.

3. The first rotating electrical machine, the second rotating electrical machine, and the power source are mounted on a vehicle, the first rotating electrical machine operates as an electric motor for driving the vehicle, the second rotating electrical machine operates as a generator for charging the power source, and when the first demagnetization determination means or the second demagnetization determination means determines the demagnetization, the output of the second rotating electrical machine is suppressed so that the cruising distance of the vehicle charged with the power source can be extended. The control device for a rotating electrical machine according to claim 1 or 2, characterized in that it is configured as described above.

4. When the first demagnetization determination means determines demagnetization, the torque of the first rotating electrical machine is suppressed so that no overcurrent occurs in the first rotating electrical machine. When the second demagnetization determination means determines demagnetization, the torque of the second rotating electrical machine is suppressed so that no overcurrent occurs in the second rotating electrical machine. The control device for a rotating electrical machine according to any one of claims 1 to 3, characterized in that it is configured as described above.

5. When the first demagnetization determination means determines demagnetization, the output of the second rotating electrical machine is suppressed so that the second rotating electrical machine is driven only by the power supplied from the power source. When the second demagnetization determination means determines demagnetization, the output of the first rotating electrical machine is suppressed so that the first rotating electrical machine is driven only by the power supplied from the power source. The control device for a rotating electrical machine according to any one of claims 1 to 4, characterized in that it is configured as described above.

6. The power source is composed of a plurality of devices. When the first demagnetization determination means determines demagnetization, the output of the second rotating electrical machine is suppressed so that the output of the power source becomes the minimum value of the power that can be output. When the second demagnetization determination means determines demagnetization, the output of the first rotating electrical machine is suppressed so that the output of the power source becomes the minimum value of the power that can be output. The control device for a rotating electrical machine according to any one of claims 1 to 5, characterized in that it is configured as described above.

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