Control device for a rotating electric machine

Abstract

The control device of the rotary electric machine according to the present application is configured to suppress the output of the second rotary electric machine (4) to continue the drive when the first demagnetization determination unit (62) determines the demagnetization of the first rotary electric machine (3), and suppress the output of the first rotary electric machine (3) to continue the drive when the second demagnetization determination unit (72) determines the demagnetization of the second rotary electric machine (4).

Description

Technical Field

[0001] This disclosure relates to a control device for a rotating electric machine. Background Technology

[0002] Rotating electrical machines, such as permanent magnet synchronous motors, possess permanent magnets as excitation poles. The output torque of a rotating electrical machine with permanent magnets as excitation poles corresponds to the magnitude of the magnetic force of the permanent magnets. It is well known that permanent magnets experience a decrease in magnetic force due to a phenomenon called demagnetization. One reason for this demagnetization is an increase in the temperature of the permanent magnet. Therefore, when the temperature of the rotating electrical machine rises and the permanent magnets serving as excitation poles become high-temperature, demagnetization occurs, leading to a decrease in the magnetic force of the permanent magnets and making it impossible to obtain the desired output from the rotating electrical machine.

[0003] In the past, various technologies for controlling rotating electric machines have been proposed to address the demagnetization of permanent magnets. For example, Patent Document 1 discloses a technology that compares the detected induced voltage of a permanent magnet with the induced voltage of a permanent magnet in a fully magnetized state to generate a magnetic display of the permanent magnet. When this magnetic display reaches a predetermined threshold, the rotating electric machine is prevented from operating to avoid damage to its components.

[0004] In addition, Patent Document 2 discloses a technique that estimates magnetic force based on at least two detection signals among motor speed, motor voltage, and motor current. When the estimated magnetic force indicates demagnetization, the technique selects to increase the reluctance torque of the motor or limit the output of the motor drive control unit.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2003-204693

[0008] Patent Document 2: Japanese Patent Application Publication No. 2013-110804 Summary of the Invention

[0009] The technical problem that the invention aims to solve

[0010] According to the prior art disclosed in Patent Document 1, when the demagnetization of the permanent magnet is detected, the rotary motor will be rendered inoperable in order to prevent damage to the structural components of the rotary motor. Therefore, after the demagnetization of the permanent magnet is detected, the rotary motor cannot be driven.

[0011] Furthermore, for example, in a device where a rotating motor for driving a vehicle and a rotating motor for generating electricity are powered by the same power source, if the insufficient power supply to one rotating motor is compensated by the output of the other rotating motor, when the aforementioned power deficiency is calculated based on the mechanical output of torque command and speed, according to the technology disclosed in Patent Document 2, the magnetic force is estimated based on at least two detection signals among the rotating motor's speed, voltage, and current. Therefore, a mismatch will occur between the actual output of the rotating motor, which experiences a decrease in output torque due to demagnetization, and the output calculated based on the aforementioned estimation.

[0012] In the aforementioned prior art, in order to compensate for the output reduction of the rotating motor caused by demagnetization by using the output of another rotating motor, insufficient or excessive output flows out of or into the power supply. This presents potential risks such as a larger current flowing into the power supply than intended for normal operation, leading to damage to structural components, or an overcurrent detected on the power supply side causing the rotating motor to stop operating.

[0013] This disclosure discloses a technology for solving the above-mentioned problems, the purpose of which is to provide a control device for a rotating electric motor that can continuously drive the rotating electric motor even if the output of one of a plurality of rotating electric motors connected to a general power supply is reduced due to demagnetization of a permanent magnet, without causing damage to structural components or the like.

[0014] Technical means for solving technical problems

[0015] The control device for the rotary electric machine disclosed in this application connects at least one first rotary electric machine and at least one second rotary electric machine to a universal power supply for driving. At least one first rotating electric motor has an excitation pole composed of permanent magnets and an armature winding that generates magnetic flux linked with the excitation pole, and operates as an electric motor. At least one second rotating electric motor has excitation poles made of permanent magnets and armature windings that generate magnetic flux linked with the excitation poles, and operates as a generator. The control device for the rotary electric motor is characterized in that it includes: A first demagnetization determination unit for determining the demagnetization of the permanent magnet in the first rotating motor; and A second demagnetization determination unit for determining the demagnetization of the permanent magnet in the second rotary motor. When the first demagnetization determination unit determines that demagnetization has occurred, it suppresses the output of the second rotary motor to continue the drive. When the second demagnetization determination unit determines that the demagnetization has occurred, it suppresses the output of the first rotary motor to continue the drive.

[0016] Invention Effects

[0017] According to the control device for the rotating electric machine disclosed herein, a control device for the rotating electric machine can be obtained, which can achieve continuous driving of the rotating electric machine even if the output of one of a plurality of rotating electric machines connected to a general power supply is reduced due to demagnetization of the permanent magnet, without causing damage to structural components, etc. Attached Figure Description

[0018] Figure 1 This is a functional block diagram showing the overall structure of the control device for the rotary electric machine according to Embodiment 1.

[0019] Figure 2 This is a functional block diagram showing the structure of the first control unit in the control device for the rotary electric machine according to Embodiment 1.

[0020] Figure 3 This is a functional block diagram showing the structure of the second control unit in the control device for the rotary electric machine according to Embodiment 1.

[0021] Figure 4 This is a functional block diagram showing the structure of the command adjustment unit in the control device of the rotary electric machine according to Embodiment 1.

[0022] Figure 5 This is an explanatory diagram showing the limiting torque characteristics of one rotating motor when another rotating motor demagnetizes in the control device for the rotating motor according to Embodiment 1.

[0023] Figure 6 This is an explanatory diagram showing the limiting torque characteristics of a rotating motor when it demagnetizes, in the control device for the rotating motor according to Embodiment 1.

[0024] Figure 7A This is an explanatory diagram illustrating the output states of the first and second rotary motors during normal operation.

[0025] Figure 7B This is an explanatory diagram illustrating the output states of the first and second rotary motors when the second rotary motor is demagnetized.

[0026] Figure 7C This is an explanatory diagram illustrating the output states of the first and second rotary motors when the second rotary motor is demagnetized in the control device for the rotary electric machine according to Embodiment 1.

[0027] Figure 8A This is an explanatory diagram illustrating the output states of the first and second rotary motors during normal operation.

[0028] Figure 8B This is an explanatory diagram illustrating the output states of the first and second rotary motors when the first rotary motor is demagnetized.

[0029] Figure 8C This is an explanatory diagram illustrating the output states of the first and second rotary motors when the first rotary motor is demagnetized in the control device for the rotary electric machine according to Embodiment 1.

[0030] Figure 9 This is a block diagram showing a portion of the hardware structure of the structural elements in the control device for the rotating electric machine according to Embodiment 1.

[0031] Figure 10 This is a functional block diagram illustrating an example of the power supply structure in the control device for the rotating electric machine according to Embodiment 1. Detailed Implementation

[0032] The control device for the rotary motor according to Embodiment 1 will be described below based on the accompanying drawings. The control device for the rotary motor according to Embodiment 1 described below is a control device for controlling a first rotary motor for driving a vehicle and a second rotary motor for generating electricity in an electric vehicle (EV). However, this disclosure is not limited to a control device for a rotary motor in an EV, and can also be applied to other devices. Furthermore, in the accompanying drawings, the same reference numerals denote the same or equivalent parts.

[0033] Implementation method 1.

[0034] Figure 1 This is a functional block diagram showing the overall structure of the control device for the rotary electric machine according to Embodiment 1. Figure 1 In this embodiment, the control device 100 controls a first rotary motor 3, which serves as a drive unit, and a second rotary motor 4, which serves as a generator. The drive unit is used to drive the EV vehicle, and the generator is used to charge the battery, which serves as the power source 1 for the EV. The first rotary motor 3 and the second rotary motor 4 receive power from a common power source 1 and are controlled by the control device 100. As described later, the control device 100 has a power conversion function and is therefore also referred to as a power converter; here, it is referred to as the control device.

[0035] The first rotary motor 3 and the second rotary motor 4 are, for example, permanent magnet type synchronous rotary motors. The rotor has excitation poles composed of permanent magnets, and the stator has a three-phase stator winding consisting of armature windings 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 rotary motor 3 are respectively connected to the U-phase terminal conductor U1, V-phase terminal conductor V1, and W-phase terminal conductor W1 derived from the first control unit 6. During normal operation, the first rotary motor 3 operates as a motor to drive the vehicle.

[0036] The U-phase stator winding, V-phase stator winding, and W-phase stator winding of the second rotary motor 4 are respectively connected to the U-phase terminal conductor U2, V-phase terminal conductor V2, and W-phase terminal conductor W2 derived from the second control unit 7. During normal operation, the second rotary motor 4 functions as a generator for charging the battery, which serves as the power source 1.

[0037] A first rotational state detector 31 installed on the first rotary motor 3 detects the rotational speed N1 [rpm] and electrical angular velocity ω1 [rad / s] of the rotor of the first rotary motor 3 and inputs the data to the first control unit 6. Furthermore, a second rotational state detector 41 installed on the second rotary motor 4 detects the rotational speed N1 [rpm] and electrical angular velocity ω2 [rad / s] of the rotor of the second rotary motor 4 and inputs the data to the second control unit 7.

[0038] Power supply 1 may be composed of, for example, a high-capacity lithium-ion battery, but it may also be equipped with a boost converter. When power supply 1 is equipped with a boost converter, control device 100 is configured to limit the output power of the boost converter to the minimum power that power supply 1 and the boost converter can output. Figure 10 This is a functional block diagram illustrating an example of the structure of the power supply in the control device for the rotating electric machine according to Embodiment 1, showing an example of a power supply structure equipped with a boost converter. For example... Figure 10 As shown, the power supply 1 includes a battery 111, a boost converter 112, and a minimum value selection unit 113.

[0039] Here, power supply 1 is configured such that when the output power P111[W] of battery 111 is limited by the output power P11[W] and the output power P112[W] of boost converter 112 is limited by the output power P12[W], the minimum value selection unit 113 selects the minimum value between the output power P111[W] of battery 111 and the output power P112[W] of boost converter 112, so that the output power P113[W] of power supply 1 does not exceed the aforementioned output power P11[W] and P12[W], so as to protect the components when the rotating motor demagnetizes, and the selected output power is used as the output power P113[W] of power supply 1.

[0040] The control device 100 includes a command adjustment unit 5, a first control unit 6 for controlling the first rotary motor 3, and a second control unit 7 for controlling the second rotary motor. The command adjustment unit 5 adjusts the first requested torque τ1r [Nm] for the first rotary motor 3 input from outside the control device 100 according to the driving state of the vehicle, thereby generating a command torque τ1c [Nm] for the first rotary motor 3, and inputs the generated command torque τ1c [Nm] to the first control unit 6.

[0041] Furthermore, the command adjustment unit 5 adjusts the second requested torque τ2r[Nm] for the second rotary motor 4 input from outside the control device 100 according to the vehicle's driving state, thereby generating a command torque τ2c[Nm] for the second rotary motor 4, and inputs the generated command torque τ2c[Nm] to the second control unit 7.

[0042] The first control unit 6 inputs the rotor speed N1 [rpm] and electrical angular velocity ω1 [rad / s] of the first rotary motor 3 detected by the first rotational state detector 31 to the command adjustment unit 5. Furthermore, the first control unit 6 inputs the demagnetization determination flag F1, described later, to the command adjustment unit 5. The second control unit 7 inputs the rotor speed N2 [rpm] and electrical angular velocity ω2 [rad / s] of the second rotary motor 4 detected by the second rotational state detector 41 to the command adjustment unit 5. Furthermore, the second control unit 7 inputs the demagnetization determination flag F2, described later, to the command adjustment unit 5.

[0043] Figure 2 This is a functional block diagram showing the structure of the first control unit in the control device for the rotating electric machine according to Embodiment 1. Figure 2 In this configuration, the first control unit 6 includes a first drive unit 61, a first demagnetization determination unit 62, and a first electrical quantity detector 63. The first demagnetization determination unit 62 includes a first estimator 621 and a first determiner 622. The first electrical quantity detector 63 detects the armature current I1[A] and voltage Vi1[V] of the first rotary motor 3.

[0044] The first drive unit 61 includes a three-phase power conversion circuit (not shown) and a drive circuit (not shown) for driving the semiconductor switching elements constituting the three-phase power conversion circuit. The three-phase power conversion circuit is composed of a three-phase bridge circuit, which has a U-phase bridge arm composed of a series connection of a U-phase upper bridge arm semiconductor switching element and a U-phase lower bridge arm semiconductor switching element, a V-phase bridge arm composed of a series connection of a V-phase upper bridge arm semiconductor switching element and a V-phase lower bridge arm semiconductor switching element, and a W-phase bridge arm composed of a series connection of a W-phase upper bridge arm semiconductor switching element and a W-phase lower bridge arm semiconductor switching element.

[0045] The U-phase terminal conductor U1, derived from the series connection of the U-phase upper bridge arm semiconductor switching element and the U-phase lower bridge arm semiconductor switching element, is connected to the U-phase stator winding of the first rotary motor 3. The V-phase terminal conductor V1, derived from the series connection of the V-phase upper bridge arm semiconductor switching element and the V-phase lower bridge arm semiconductor switching element, is connected to the V-phase stator winding of the first rotary motor 3. The W-phase terminal conductor W1, derived from the series connection of the W-phase upper bridge arm semiconductor switching element and the W-phase lower bridge arm semiconductor switching element, is connected to the W-phase stator winding of the first rotary motor 3.

[0046] In normal operation, the drive circuit in the first drive unit 61 performs PWM (Pulse Width Modulation) control on the switching of each semiconductor switching element, so that the three-phase power conversion circuit operates as an inverter. Thus, the first rotary motor 3 operates as a motor for driving the vehicle.

[0047] The first estimator 621 in the first demagnetization determination unit 62 calculates the magnetic flux of the permanent magnet constituting the excitation pole of the first rotary motor 3 based on the following equations (1), (2), and (3), and outputs it as the estimated magnetic flux Φ1[Wb].

[0048] [Mathematical Expression 1]

[0049] In equation (1), Φ DC For steady-state terms, the following equation (2) is used for calculation.

[0050] [Mathematical Expression 2]

[0051] In addition, in equation (1), Φ DIV The differential term is calculated using the following formula (3).

[0052] [Mathematical Expression 3]

[0053] Here, ω is the electrical angular velocity ω1 [rad / s] of the rotor of the first rotating motor 3 detected by the first rotational state detector 31. d I q It is the d-axis current component and q-axis current component of the armature current obtained by calculating the armature current I1 [A] of the first rotating motor 3 detected by the first electrical quantity detector 63 and the electrical angular velocity ω1 [rad / s]. R is the resistance value of the first rotating motor 3 [Ω], V q This refers to the q-axis voltage command value for the first rotary motor 3. L d L q These are the d-axis and q-axis inductance components of the first rotary motor 3, derived from pre-stored information. K is a correction coefficient.

[0054] In addition, the magnetic flux of the permanent magnet of the first rotating motor 3 can also be estimated using methods other than the above calculations.

[0055] The first determiner 622 in the first demagnetization determination unit 62 is configured to compare the estimated magnetic flux Φ1[Wb] of the permanent magnet of the first rotary motor 3 estimated by the first estimator 621 with a preset threshold Φth[Wb] (not shown), thereby determining whether the permanent magnet of the first rotary motor 3 has demagnetized. When the estimated magnetic flux Φ1[Wb] is less than the threshold Φth[Wb], it is determined that the permanent magnet of the first rotary motor 3 has demagnetized, and the demagnetization determination flag F1 is output.

[0056] Figure 3 This is a functional block diagram showing the structure of the second control unit in the control device for the rotating electric machine according to Embodiment 1. Figure 3 In this configuration, the second control unit 7 includes a second drive unit 71, a second demagnetization determination unit 72, and a second electrical quantity detector 73. The second demagnetization determination unit 72 includes a second estimator 721 and a second determiner 722. The second electrical quantity detector 73 detects the armature current I2[A] and voltage Vi2[V] of the second rotary motor 4.

[0057] The second drive unit 71 includes a three-phase power conversion circuit (not shown) and a drive circuit (not shown) for driving the semiconductor switching elements constituting the power conversion circuit. The three-phase power conversion circuit is composed of a three-phase bridge circuit, which has a U-phase bridge arm composed of a series connection of a U-phase upper bridge arm semiconductor switching element and a U-phase lower bridge arm semiconductor switching element, a V-phase bridge arm composed of a series connection of a V-phase upper bridge arm semiconductor switching element and a V-phase lower bridge arm semiconductor switching element, and a W-phase bridge arm composed of a series connection of a W-phase upper bridge arm semiconductor switching element and a W-phase lower bridge arm semiconductor switching element.

[0058] The U-phase terminal conductor U2, derived from the series connection of the U-phase upper bridge arm semiconductor switching element and the U-phase lower bridge arm semiconductor switching element, is connected to the U-phase stator winding of the second rotary motor 4. The V-phase terminal conductor V2, derived from the series connection of the V-phase upper bridge arm semiconductor switching element and the V-phase lower bridge arm semiconductor switching element, is connected to the V-phase stator winding of the second rotary motor 4. The W-phase terminal conductor W2, derived from the series connection of the W-phase upper bridge arm semiconductor switching element and the W-phase lower bridge arm semiconductor switching element, is connected to the W-phase stator winding of the second rotary motor 4.

[0059] The drive circuit in the second drive unit 71 controls the switching of each semiconductor switching element during normal operation, so that the three-phase power conversion circuit operates as a converter. As a result, the second rotary motor 4 operates as a generator, which charges the battery that serves as the power source 1.

[0060] The second estimator 721 in the second demagnetization determination unit 72 calculates the magnetic flux of the permanent magnet constituting the excitation pole of the second rotary motor 4 based on the above equations (1), (2), and (3), and outputs it as the estimated magnetic flux Φ2[Wb].

[0061] In equations (1), (2), and (3) above, ω is the electrical angular velocity ω2 [rad / s] of the rotor of the second rotating motor 4 detected by the second rotating state detector 41. d I q It is the d-axis current component and q-axis current component of the armature current obtained by calculating the armature current I2 [A] of the second rotating motor 4 detected by the second electrical quantity detector 73 and the electrical angular velocity ω2 [rad / s]. R is the resistance value of the second rotating motor 4 [Ω], V q This refers to the q-axis voltage command value for the second rotary motor 4. d L q These are the d-axis and q-axis inductance components of the second rotary motor 4, derived from pre-stored information. K is a correction coefficient.

[0062] In addition, the magnetic flux of the permanent magnet of the second rotating motor 4 can also be estimated using methods other than the above calculations.

[0063] The second demagnetization determination unit 72 has a second determination unit 722 configured to compare the estimated magnetic flux Φ2[Wb] of the permanent magnet of the second rotary motor 4 estimated by the second estimator 721 with a preset threshold Φth[Wb] (not shown) to determine whether the permanent magnet of the second rotary motor 4 has demagnetized. When the estimated magnetic flux Φ2[Wb] is less than the threshold Φth[Wb], it is determined that the permanent magnet of the second rotary motor 4 has demagnetized, and a demagnetization determination flag F2 is output.

[0064] Figure 4 This is a functional block diagram showing the structure of the command adjustment unit in the control device of the rotary electric machine according to Embodiment 1. Figure 4 In the instruction adjustment unit 5, there are a first output arithmetic unit 51, a second output arithmetic unit 52, an adjustment unit 53, a first restriction unit 54 and a second restriction unit 55.

[0065] The first output calculation unit 51 calculates the estimated output P1[W] of the first rotary motor 3 based on the command torque τ1c[Nm] for the first rotary motor 3 input from the first limiting unit 54 and the rotational speed N1[rpm] of the first rotary motor 3 input from the first rotational state detector 31, using a general formula for calculating the mechanical output of a rotary motor based on its rotational speed and torque, and then inputs it to the adjustment unit 53. Alternatively, the estimated output P1[W] can also be obtained using methods other than those described above.

[0066] The second output calculation unit 52 calculates the estimated output P2[W] of the second rotary motor 4 based on the command torque τ2c[Nm] for the second rotary motor 4 input from the second limiting unit 55 and the rotational speed N2[rpm] of the second rotary motor 4 input from the second rotational state detector 41, using a general formula for calculating the mechanical output of a rotary motor based on its rotational speed and torque, and then inputs it to the adjustment unit 53. Alternatively, the estimated output P2[W] can also be obtained using methods other than those described above.

[0067] The adjustment unit 53 calculates the output power P0 [W] (not shown) that the power supply 1 can output based on the rated voltage Vs [V] and rated current Is [A] of the power supply 1. In addition, the adjustment unit 53 derives the output torque τ1p [Nm] for limiting the output of the first rotary motor 3 based on the estimated output P2 [W] of the second rotary motor 4 input from the second output calculation unit 52 and the output power P0 [W] of the power supply 1, and inputs it to the first limiting unit 54.

[0068] Furthermore, the adjustment unit 53 derives the output torque τ2p[Nm] for limiting the output of the second rotary motor 4 based on the estimated output P1[W] of the first rotary motor 3 input from the first output calculation unit 51 and the output power P0[W] of the power supply 1, and inputs it to the second limiting unit 55.

[0069] Next, the first limiting unit 54 will be described. The first limiting unit 54 is configured to receive the requested torque τ1r [Nm] for the first rotary motor 3 input from outside the control device 100, the demagnetization determination flag F1 input from the first demagnetization determination unit 62 of the first control unit 6, the demagnetization determination flag F2 input from the second demagnetization determination unit 72 of the second control unit 7, the rotational speed N1 [rpm] of the first rotary motor 3 input from the first rotational state detector 31, and the output torque τ1p [Nm] input from the adjustment unit 53.

[0070] When the permanent magnet of the second rotary motor 4 demagnetizes and the demagnetization judgment flag F2 is input, the first limiting unit 54 outputs based on the following description. Figure 5 The torque value that is smaller of the limiting torque τ1s1[Nm] (not shown) set for the first rotary motor 3 and the output torque τ1p[Nm] input from the adjustment unit 53 is used as the command torque τ1c for the first rotary motor 3. In other words, the requested torque τ1r[Nm] is limited to the smaller of the limiting torque τ1s1[Nm] and the output torque τ1p[Nm], and the limited torque value is output as the command torque τ1c for the first rotary motor.

[0071] Here is the Figure 5 Please provide an explanation. Figure 5 This is an explanatory diagram showing the torque limiting characteristics of one rotating motor in the control device for the rotating electric motor according to Embodiment 1 when another rotating motor demagnetizes. It illustrates a method for suppressing the output of the rotating motor in which demagnetization is not determined. When the permanent magnet of the rotating motor demagnetizes, the torque of the rotating motor decreases, and therefore the actual output of the rotating motor decreases.

[0072] On the other hand, the first output processing unit 51 generates an estimated output P1 based on the command torque τ1c for the first rotary motor 3, thus creating a mismatch between the estimated output P1 and the actual output of the first rotary motor 3. Furthermore, the second output processing unit 52 generates an estimated output P2 based on the command torque τ2c for the second rotary motor 4, also creating a mismatch between the estimated output P2 and the actual output of the second rotary motor 4.

[0073] Therefore, due to the above mismatch, it is possible for power supply 1 to flow out of the expected power or to flow into power supply 1, which may damage structural components such as power supply 1, or it may be necessary to detect the overcurrent of power supply 1 to stop the drive of the first rotary motor 3, the second rotary motor 4, or both of them.

[0074] Therefore, in the control device for the rotary electric machine of Embodiment 1, the first limiting unit 54 is provided with a torque for limiting the requested torque τ1r or the requested torque τ2r as a limiting torque τ1s1, and the second limiting unit 55 is provided with a torque for limiting the requested torque τ1r or the requested torque τ2r as a limiting torque τ2s1, so that when the permanent magnet of the other rotary electric machine is detected to have demagnetized based on the demagnetization determination flag F1 or the demagnetization determination flag F2, the rotary electric machine that has not detected demagnetization can be driven solely by the power of the power supply 1. Specifically, the first limiting unit 54 and the second limiting unit 55 are provided with limiting torques τ1s1 and τ2s1 obtained by setting an upper limit value of the torque for each speed of one of the rotary electric machines, so as to suppress the output of one rotary electric machine when the other rotary electric machine demagnetizes.

[0075] exist Figure 5In this diagram, if we designate the first rotary motor 3 as the one that has not demagnetized and the second rotary motor 4 as the one that has demagnetized, then the vertical axis represents the torque [Nm] of the first rotary motor 3, and the horizontal axis represents the rotational speed [rpm] of the first rotary motor 3. In this case, T0 shows the torque characteristic of the second rotary motor 4 relative to the first rotary motor 3 under normal conditions when it has not demagnetized, and T1 shows the characteristic curve of the limited torque of the second rotary motor 4 relative to the first rotary motor 3 when it has demagnetized.

[0076] On the other hand, Figure 5 In this diagram, if we designate the rotary motor that has not demagnetized as the second rotary motor 4 and the other rotary motor that has demagnetized as the first rotary motor 3, then the vertical axis represents the torque [Nm] of the second rotary motor 4, and the horizontal axis represents the rotational speed [rpm] of the second rotary motor 4. In this case, T0 shows the characteristic of the limiting torque for the second rotary motor 4 when the first rotary motor 3 has not demagnetized, and T1 shows the characteristic curve of the limiting torque for the second rotary motor 4 when the first rotary motor 3 has demagnetized.

[0077] At this time, Figure 4 If the first limiting unit 54 receives a demagnetization determination flag F2 from the second demagnetization determination unit 72, then it is considered as described above. Figure 5 Another rotating motor, the second rotating motor 4, demagnetizes, and the limiting torque τ1s1[Nm] for the first rotating motor 3, which is also a rotating motor, is based on... Figure 5 The characteristic curve T1 of the limiting torque shown is set according to the rotational speed N1 [rpm] of the first rotary motor 3. As described above, the first limiting unit 54 inputs the smaller of the limiting torque τ1s1 and the output torque τ1p [Nm] input from the adjustment unit 53 as the command torque τ1c for the first rotary motor. Figure 1 The first control unit 6 is shown.

[0078] Next, if the permanent magnet of the first rotary motor 3 demagnetizes and the demagnetization determination flag F1 is input to the first limiting unit 54, the output will be based on the following description. Figure 6 The torque value that is smaller of the limiting torque τ1s2 [Nm] (not shown) set for the first rotary motor 3 and the output torque τ1p [Nm] input from the adjustment unit 53 is used as the command torque τ1c for the first rotary motor 3. In other words, the requested torque τ1r [Nm] is limited to the smaller of the limiting torque τ1s2 [Nm] and the output torque τ1p [Nm], and this limited torque value is input to... Figure 1 The first control unit 6 shown is used as the command torque τ1c for the first rotary motor 3.

[0079] Here is the Figure 6 Please provide an explanation. Figure 6 This is an explanatory diagram showing the limiting torque characteristics of a rotating motor when it demagnetizes in the control device for the rotating motor according to Embodiment 1. When the permanent magnet of the rotating motor demagnetizes, the characteristics of the rotating motor change, and the peak value of the phase current flowing through the armature winding, i.e., the peak value of the armature current, increases, thus creating the possibility of overcurrent being detected.

[0080] Therefore, in the control device for the rotary electric machine according to Embodiment 1, the first limiting unit 54 and the second limiting unit 55 are pre-equipped with limiting torques τ1s2[Nm] and τ2s2[Nm] (not shown) to limit the requested torque τ1r or requested torque τ2r, so that the permanent magnet of the rotary electric machine is detected to have demagnetized according to the demagnetization determination flag F1 or demagnetization determination flag F2, and the rotary electric machine that has been demagnetized can be driven at a level where no overcurrent is detected. Specifically, the first limiting unit 54 and the second limiting unit 55 are equipped with limiting torques τ1s2[Nm] and τ2s2[Nm] that further suppress the maximum torque compared to normal operation, so that the maximum torque is suppressed when the rotary electric machine is demagnetized.

[0081] Here, the limiting torque τ1s2 [Nm] is a torque value that prevents the armature current of the first rotating motor 3, which is undergoing demagnetization, from being detected as an overcurrent, and the limiting torque τ2s2 [Nm] is a torque value that prevents the armature current of the second rotating motor 4, which is undergoing demagnetization, from being detected as an overcurrent. That is, the configuration is such that when the first demagnetization determination unit 62 determines demagnetization, the torque of the first rotating motor is suppressed so that the first rotating motor 3 does not generate overcurrent; and when the second demagnetization determination unit 72 determines demagnetization, the torque of the second rotating motor is suppressed so that the second rotating motor does not generate overcurrent.

[0082] exist Figure 6 In the diagram, if a demagnetized rotary motor is designated as the first rotary motor 3, then the vertical axis represents the torque [Nm] of the first rotary motor 3, and the horizontal axis represents the rotational speed [rpm] of the first rotary motor 3. In this case, T0 shows the torque characteristics of the first rotary motor 3 during normal operation without demagnetization, and T1 shows the characteristic curve of the limiting torque of the first rotary motor 3 when demagnetization occurs.

[0083] On the other hand, Figure 6In the diagram, if the demagnetized rotary motor is designated as the second rotary motor 4, then the vertical axis represents the torque [Nm] of the second rotary motor 4, and the horizontal axis represents the rotational speed [rpm] of the second rotary motor 4. In this case, T0 shows the torque characteristics of the second rotary motor 4 during normal operation without demagnetization, and T2 shows the characteristic curve of the limited torque of the second rotary motor 4 when demagnetization occurs.

[0084] exist Figure 4 In the process, when the first limiting unit 54 inputs the demagnetization determination flag F1 from the first demagnetization determination unit 62, the limiting torque τ1s2 [Nm] for the first rotating motor 3 is based on... Figure 6 The limiting torque characteristic curve T2 shown is set according to the rotational speed N1 [rpm] of the first rotary motor 3. As described above, the first limiting unit 54 inputs the smaller of the limiting torque τ1s2 and the output torque τ1p [Nm] input from the adjustment unit 53 to... Figure 1 The first control unit 6 shown is used as the command torque τ1c for the first rotary motor 3.

[0085] When neither the first rotary motor 3 nor the second rotary motor 4 has demagnetized and neither the demagnetization determination flag F1 nor the demagnetization determination flag F2 has been input, the first limiting unit 54 uses the outputtable torque τ1p generated based on the estimated output P1[W] to limit the requested torque τ1r[Nm] for the first rotary motor 3, and outputs the value obtained therefrom as the command torque τ1c for the first rotary motor 3 and inputs it to the first control unit 6.

[0086] Next, the second limiting unit 55 will be explained. Figure 4 In this configuration, the second limiting unit 55 is configured to receive inputs including the requested torque τ2r [Nm] for the second rotary motor 4 from an external input of the control device 100, the demagnetization determination flag F2 from the second demagnetization determination unit 72 of the second control unit 7, the demagnetization determination flag F1 from the first demagnetization determination unit 62 of the first control unit 6, the rotational speed N2 [rpm] of the second rotary motor 4 from the second rotational state detector 41, and the output torque τ2p [Nm] from the adjustment unit 53.

[0087] When the permanent magnet of the first rotary motor 3 demagnetizes and the demagnetization judgment flag F1 is input, the second limiting unit 55 outputs based on the following description. Figure 5The torque value that is smaller of the limiting torque τ2s1 [Nm] set for the second rotary motor 4 and the output torque τ2p [Nm] input from the adjustment unit 53 is used as the command torque τ2c for the second rotary motor 4. In other words, the requested torque τ2r [Nm] is limited to the smaller of the limiting torque τ2s1 [Nm] and the output torque τ2p [Nm], and this limited torque value is input to... Figure 1 The second control unit 7 shown is used as the command torque τ2c for the second rotary motor 4.

[0088] Next, if the permanent magnet of the second rotary motor 4 demagnetizes and the demagnetization judgment flag F2 is input, then the second limiting unit 55 is based on Figure 6 The characteristic curve T2 of the limiting torque shown is used to set the limiting torque τ2s2 [Nm] for the second rotary motor 4 based on the rotational speed N2 [rpm] of the second rotary motor 4. As described above, the second limiting unit 55 inputs the smaller of the limiting torque τ2s2 and the output torque τ2p [Nm] input from the adjustment unit 53 to... Figure 1 The first control unit 6 shown is used as the command torque τ2c for the second rotary motor 4.

[0089] When neither the first rotary motor 3 nor the second rotary motor 4 has demagnetized and neither the demagnetization determination flag F1 nor the demagnetization determination flag F2 has been input, the second limiting unit 55 uses the output torque τ2p generated based on the estimated output P2[W] to limit the requested torque τ2r[Nm] for the second rotary motor 4, and outputs the value obtained therefrom as the command torque τ2c for the second rotary motor 4 and inputs it to the second control unit 7.

[0090] Next, the operation of the control device for the rotary electric machine according to Embodiment 1, configured as described above, will be explained. During the so-called normal operation, when neither the first rotary electric machine 3 nor the second rotary electric machine 4 has demagnetized, and neither the demagnetization determination flag F1 nor the demagnetization determination flag F2 is generated, the first limiting unit 54 limits the requested torque τ1r [Nm] for the first rotary electric machine 3 using the output torque τ1p generated based on the estimated output P1 [W]. The value obtained is then output as the command torque τ1c for the first rotary electric machine 3 and input to the first control unit 6. Thus, the first control unit 6 controls the first rotary electric machine 3 to operate as a motor that generates torque following the command torque τ1c, for example, to drive a vehicle.

[0091] Furthermore, during the so-called normal operation where neither the first rotary motor 3 nor the second rotary motor 4 has demagnetized, and neither the demagnetization determination flag F1 nor the demagnetization determination flag F2 is generated, the second limiting unit 55 uses the output torque τ2p generated based on the estimated output P2[W] to limit the requested torque τ2r[Nm] for the second rotary motor 4, and outputs the resulting value as the command torque τ2c for the second rotary motor 4, and inputs it to the second control unit 7. Thus, the second control unit 7 controls the second rotary motor 4 to operate as a generator that follows the torque of the command torque τ2c, for example, generating power to charge the battery that serves as the power source 1.

[0092] Next, the operation when demagnetization occurs in the permanent magnet of the second rotary motor 4 when the output of the second rotary motor 4, which is a generator, is less than the output of the first rotary motor 3, which is a motor, will be explained.

[0093] Figure 7A This is an explanatory diagram illustrating the output states of the first and second rotary motors during normal operation. Figure 7B This is an explanatory diagram illustrating the output states of the first and second rotary motors when the second rotary motor is demagnetized. Figure 7C This is an explanatory diagram illustrating the output states of the first and second rotary motors when the second rotary motor is demagnetized in the control device for the rotary electric machine according to Embodiment 1. Figure 7A , Figure 7B , Figure 7C In the diagram, the vertical axis represents the output [W], A and A1 schematically represent the output of the first rotating motor 3 as an electric motor, B and B1 schematically represent the output of the second rotating motor 4 as a generator, and C, C1, and C2 schematically represent the power of the power source 1.

[0094] like Figure 7A As shown, during the normal operation when the permanent magnets of all rotating motors have not demagnetized, the output A of the first rotating motor 3 is greater than the power C provided by the power source 1, so the insufficient power is supplemented by the output B of the second rotating motor 4.

[0095] Next, if we assume that the permanent magnet of the second rotary motor 4 demagnetizes, then the torque of the second rotary motor 4 will decrease, therefore... Figure 7B As shown, the output of the second rotary motor 4 becomes an output B1 that is lower than the normal output B. On the other hand, the second output calculation unit 52 estimates the output of the second rotary motor 4 based on the command torque τ2c[Nm] for the second rotary motor 4, therefore, it cannot calculate the estimated output P2 that reflects the decrease in the output of the second rotary motor 4.

[0096] Therefore, the adjustment unit 53 determines that the first rotary motor 3 can be driven as usual, the command torque τ1c [Nm] is the same as during normal operation, and the output of the first rotary motor 3 remains unchanged as the output A during normal operation. Therefore, when not using Figure 7B In the case of Embodiment 1 shown, the insufficient power caused by the demagnetization of the permanent magnet of the second rotary motor 4 is supplemented by the power C1[W] of the power supply 1, and the power output of the power supply 1 becomes a further increase of power C1[W] compared to the power C[W] during normal operation. As a result, more power than expected flows from the power supply 1, which may stop the drive of the rotary motor due to the detection of overcurrent in the power supply 1 or cause damage to structural components.

[0097] In contrast, according to the control device for the rotating electric machine according to Embodiment 1, based on the demagnetization determination flag F2 output by the second demagnetization determination unit 72 in the second control unit 7 determining the demagnetization of the permanent magnet of the second rotating electric machine 4, the command torque τ1c [Nm] is limited to the value described above by the first limiting unit 54. As a result, as Figure 7C As shown, the output of the first rotary motor 3 driven by the first drive unit 61 decreases from the output A[W] during normal operation to the output A1[W].

[0098] In the event of demagnetization of the permanent magnet in the second rotary motor 4, based on the demagnetization determination flag F2, as described above... Figure 5 As explained, in the event of demagnetization of the second rotary motor 4, which is another rotary motor, the output of the first rotary motor 3 is suppressed by pre-setting the upper limit of torque for each speed, thereby relying solely on... Figure 7C The output C2 of the power supply 1 shown can drive the first rotary motor 3. As a result, it is possible to prevent drive stoppage or damage to structural components caused by the detection of overcurrent in the power supply 1 due to excessive power flowing from it.

[0099] In addition, based on the demagnetization determination flag F2, as described above... Figure 6 As explained, the maximum torque of the second rotary motor 4 when demagnetization occurs is limited from its normal operating torque to a pre-suppressed torque, thereby reducing the output of the second rotary motor 4 from... Figure 7C During normal operation, the output B drops to output B1, which prevents the detection of overcurrent in power supply 1 and allows the second rotary motor 4 to continue driving.

[0100] As described above, according to the control device for the rotary motor according to Embodiment 1, even if the permanent magnet of the second rotary motor 4 demagnetizes, the first rotary motor 3 and the second rotary motor 4 can be continuously driven without damaging the structural components, and the driving range of the vehicle can be extended.

[0101] Next, the operation when demagnetization occurs in the permanent magnet of the first rotary motor 3 when the output of the first rotary motor 3, which is a motor, is less than the output of the second rotary motor 4, which is a generator, will be explained.

[0102] Figure 8A This is an explanatory diagram illustrating the output states of the first and second rotary motors during normal operation. Figure 8B This is an explanatory diagram illustrating the output states of the first and second rotary motors during demagnetization of the first rotary motor. Figure 8C This is an explanatory diagram illustrating the output states of the first and second rotary motors when the first rotary motor is demagnetized in the control device for the rotary electric machine according to Embodiment 1. Figure 8A , Figure 8B , Figure 8C In the diagram, the vertical axis represents the output [W], A and A1 schematically represent the output of the first rotating motor 3 as an electric motor, B and B1 schematically represent the output of the second rotating motor 4 as a generator, and C, C1, and C2 schematically represent the power of the power source 1.

[0103] like Figure 8A As shown, during the normal operation when the permanent magnets of all rotating motors have not demagnetized, since the output B of the second rotating motor 4 is greater than the power C provided by the power source 1, the power that is insufficient due to the output A of the first rotating motor 3 is supplemented by the output B of the second rotating motor 4.

[0104] Next, if we assume that the permanent magnet of the first rotating motor 3 demagnetizes, then as follows: Figure 8B As shown, the output of the first rotary motor 3 becomes an output A1 that is lower than the output A during normal operation. On the other hand, the first output calculation unit 51 estimates the output of the first rotary motor 3 based on the command torque τ1c[Nm] for the first rotary motor 3, therefore, it cannot calculate the estimated output P1 that reflects the decrease in the output of the first rotary motor 3.

[0105] Therefore, the adjustment unit 53 determines that the second rotary motor 4 can be driven as usual, the command torque τ2c [Nm] is the same as usual, and the output of the second rotary motor 4 remains unchanged from the output B during normal operation. Therefore, when not applying Figure 8B In the case of Embodiment 1 shown, the excess power of the second rotary motor 4 due to the demagnetization of the first rotary motor 3 is regenerated into the power supply 1, and the power of the power supply 1 becomes a power C1 that is further increased compared to the power C during normal operation. As a result, an unexpected current flows into the power supply 1, which may lead to the detection of overcurrent in the power supply 1, causing the drive of the rotary motor to stop or damage to structural components.

[0106] In contrast, according to the control device for the rotating electric machine according to Embodiment 1, based on the demagnetization determination flag F1 output by the first demagnetization determination unit 62 in the first control unit 6 determining the demagnetization of the permanent magnet of the first rotating electric machine 3, the command torque τ2c [Nm] is limited to the value described above by the second limiting unit 55. As a result, as Figure 8C As shown, the output of the second rotary motor 4 driven by the second drive unit 71 decreases from the output B[W] during normal operation to the output B1[W].

[0107] In the event of demagnetization of the permanent magnet of the first rotary motor 3, based on the demagnetization determination flag F1, as described above... Figure 5 As explained, when the first rotary motor 3, which is another rotary motor, demagnetizes, the output of the second rotary motor 4 is suppressed according to the torque upper limit value preset for each speed, thereby achieving [the desired effect]. Figure 8C The output C2 of the power supply 1 and the suppressed output B1 of the second rotary motor 4 can drive the first rotary motor 3. As a result, it is possible to prevent drive stoppage or damage to structural components caused by the detection of overcurrent in the power supply 1 due to unexpected power flowing into it.

[0108] In addition, based on the demagnetization determination flag F1, as described above... Figure 6 As explained, the maximum torque of the first rotary motor 3 when demagnetization occurs is limited from its normal state to a pre-suppressed torque, thereby reducing the output of the first rotary motor 3 from... Figure 8C During normal operation, the output A drops to output A1, thus allowing the first rotary motor 3 to continue driving.

[0109] As described above, according to the control device for the rotary motor according to Embodiment 1, even if the permanent magnet of the first rotary motor 3 demagnetizes, the first rotary motor 3 and the second rotary motor 4 can be continuously driven without damaging the structural components, and the vehicle can continue to travel.

[0110] In the control device for the rotary electric machine according to Embodiment 1 above, the command adjustment unit 5, at least the first demagnetization determination unit 62 in the first control unit 6, and at least the second demagnetization determination unit 72 in the second control unit 7 can be composed of an ECU (Electronic Control Unit).

[0111] Figure 9 This is a block diagram illustrating a portion of the hardware structure of the structural elements in the control device for the rotary electric machine according to Embodiment 1, showing the hardware structure of the aforementioned ECU. Figure 9In this configuration, the ECU 1000 comprises a processor 1001 and a storage device 1002. The storage device 1002 includes volatile storage devices such as random access memory and non-volatile auxiliary storage devices such as flash memory. Alternatively, an auxiliary storage device such as a hard disk can be used instead of flash memory.

[0112] The processor 1001 executes the 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. Alternatively, the processor 1001 can output data such as calculation results to the volatile storage device of the storage device 1002, or it can save data to the auxiliary storage device via the volatile storage device.

[0113] The control device for the rotary electric machine according to Embodiment 1 described above is configured to have multiple rotary electric machines powered by a general-purpose power supply. Each rotary electric machine includes at least one rotary electric machine for driving and at least one rotary electric machine for generating electricity. It also includes a demagnetization determination unit that determines the demagnetization of the permanent magnet of at least one of the multiple rotary electric machines. If demagnetization is determined in either the driving or generating rotary electric machine, the output of the driving or generating rotary electric machine that was not determined to be demagnetized is suppressed, so that driving of each rotary electric machine can continue. With this structure, even after demagnetization of the permanent magnet of any one rotary electric machine, driving of the rotary electric machine can continue.

[0114] Furthermore, in the control device for the rotating electric machine according to Embodiment 1, the demagnetization determination unit is configured to suppress the torque of the rotating electric machine when the permanent magnet is determined to be demagnetized to a level that will not generate overcurrent. With this structure, the characteristics of the rotating electric machine change when the permanent magnet of the rotating electric machine is demagnetized, thus preventing overcurrent caused by an increase in the peak value of the phase current flowing through the armature winding.

[0115] Furthermore, in the control device for the rotating electric machine according to Embodiment 1, the demagnetization determination unit is configured to suppress the output of the rotating electric machine in which demagnetization of the permanent magnet is not determined to be occurring to a level where it can be driven solely by the power supplied by the power source. With this structure, current from insufficient or excessive power caused by a mismatch between the actual output and the estimated output of the rotating electric machine due to permanent magnet demagnetization will not flow from or into the power source, thus preventing drive stoppage or damage to structural components due to detected overcurrent in the power source.

[0116] Furthermore, in the control device for the rotary electric machine according to Embodiment 1, the demagnetization determination unit is configured to suppress the output of the rotary electric machine in cases where the power supply to the rotary electric machine consists of multiple devices such as a battery and a boost converter, by using a value obtained after taking the minimum output power. With this structure, even when the power supply consists of multiple devices such as a battery and a boost converter, current from insufficient or excessive power caused by a mismatch between the actual output and the estimated output of the rotary electric machine due to permanent magnet demagnetization will not flow out of or into the power supply, thus preventing drive stoppage or damage to structural components caused by detecting overcurrent in the power supply.

[0117] Furthermore, in the control device for the rotary electric motor according to Embodiment 1, a first rotary electric motor, a second rotary electric motor, and a power supply are mounted on a vehicle. The first rotary electric motor operates as a motor driving the vehicle, and the second rotary electric motor operates as a generator charging the power supply. When the second demagnetization determination unit determines that demagnetization has occurred, it suppresses the output of the first rotary electric motor so that the vehicle can continue to travel. With this structure, even after the permanent magnet of the drive rotary electric motor has demagnetized, the vehicle can continue to travel by continuing to drive the rotary electric motor.

[0118] Furthermore, in the control device for the rotary motor according to Embodiment 1, a first rotary motor, a second rotary motor, and a power supply are mounted on a vehicle. The control device for the rotary motor is configured such that the first rotary motor operates as a motor driving the vehicle, and the second rotary motor operates as a generator charging the power supply. When the first demagnetization determination unit determines that demagnetization has occurred, it suppresses the output of the second rotary motor to extend the driving range of the vehicle after charging the power supply. With this structure, even after the permanent magnet of the second rotary motor used for power generation demagnetizes, the rotary motor can continue to be driven, thereby further extending the vehicle's driving range compared to the case where it is driven solely by the power supply.

[0119] This disclosure describes exemplary embodiments, but the various features, methods, and functions described in the embodiments are not limited to the application of specific embodiments, and can be applied to the embodiments individually or in various combinations. Therefore, it can be considered that numerous modifications not illustrated are also included within the technical scope of this disclosure. For example, cases may include modifications, additions, or omissions of at least one structural element.

[0120] Label Explanation

[0121] 100 control devices, 1 power supply, 111 batteries. 112 boost converter 113 Minimum value selection unit, 3. First rotating motor; 31. First rotating state detector. 4. Second rotating motor; 41. Second rotating status detector. 5. Instruction adjustment unit, 51 first output arithmetic unit, 52 Second output arithmetic unit, 53 Adjustment unit, 54 First limiting unit, 55 Second limiting unit, 6. First control unit, 61, 71 drive units, 62 First demagnetization determination unit, 621 First estimator, 622 First Decision Maker, 63 First Electrical Quantity Detector 7. Second Control Unit, 71. Second Drive Unit 72 Second Demagnetization Detection Unit, 721 Second Estimator 722 Second Decision Maker, 73 Second Electrical Quantity Detector U1 and U2 phase terminal conductors, V1 and V2 phase terminal conductors W1, W2W phase terminal conductors, Vs rated voltage Is is the rated current, I1 and I2 are the armature currents. Vi1 and Vi2 voltages, N1 and N2 rotational speeds ω1, ω2 electrical angular velocities, τ1r, τ2r requested torque, τ1c and τ2c are command torques, while τ1p and τ2p are output torques. τ1s1, τ1s2, τ2s1, τ2s2 limit torque. F1 and F2 demagnetization criteria 1. 2. Estimated magnetic flux P0, P11, and P12 are output power; P1 and P2 are estimated outputs. Output power of P111, P112, and P113.

Claims

1. A control device for a rotary electric motor, comprising connecting at least one first rotary electric motor and at least one second rotary electric motor to a universal power supply for driving. At least one of the first rotary electric motors includes excitation poles composed of permanent magnets and armature windings that generate magnetic flux linked with the excitation poles, and operates as an electric motor. At least one of the second rotating electric machines has an excitation pole made of permanent magnets and an armature winding that generates magnetic flux linked with the excitation pole, and operates as a generator. The control device for the rotary electric motor is characterized in that it comprises: A first demagnetization determination unit for determining the demagnetization of the permanent magnet in the first rotary motor; as well as A second demagnetization determination unit for determining the demagnetization of the permanent magnet in the second rotary motor. When the first demagnetization determination unit determines that demagnetization has occurred, it suppresses the output of the second rotary motor to continue the drive. When the second demagnetization determination unit determines that the demagnetization has occurred, it suppresses the output of the first rotary motor to continue the drive.

2. The control device for a rotating electric motor as described in claim 1, characterized in that, The first rotary motor, the second rotary motor, and the power supply are mounted on the vehicle. The first rotary motor operates as an electric motor to drive the vehicle. The second rotary motor operates as a generator to charge the power source. When the first demagnetization determination unit or the second demagnetization determination unit determines that the vehicle is demagnetized, the output of the first rotary motor is suppressed so that the vehicle can continue to drive.

3. The control device for a rotating electric motor as described in claim 1 or 2, characterized in that, The first rotary motor, the second rotary motor, and the power supply are mounted on the vehicle. The first rotary motor operates as an electric motor to drive the vehicle. The second rotary motor operates as a generator to charge the power source. When the first demagnetization determination unit or the second demagnetization determination unit determines that the vehicle is demagnetized, the output of the second rotary motor is suppressed so as to extend the driving range of the vehicle after the power supply is charged.

4. The control device for a rotating electric motor as described in any one of claims 1 to 3, characterized in that, The system is configured such that when the first demagnetization determination unit determines that demagnetization has occurred, it suppresses the torque of the first rotary motor so that the first rotary motor does not generate overcurrent. When the second demagnetization determination unit determines that demagnetization has occurred, the torque of the second rotary motor is suppressed so that the second rotary motor does not generate overcurrent.

5. The control device for a rotating electric motor as described in any one of claims 1 to 4, characterized in that, The system is configured such that when the first demagnetization determination unit determines that demagnetization has occurred, it suppresses the output of the second rotary motor, so that the second rotary motor is driven solely by power supplied from the power source. When the second demagnetization determination unit determines that demagnetization has occurred, the output of the first rotary motor is suppressed so that the first rotary motor is driven solely by the power supplied from the power source.

6. The control device for a rotating electric machine as described in any one of claims 1 to 5, characterized in that, The power supply is composed of multiple devices, and the control device for the rotating motor is configured as follows: When the first demagnetization determination unit determines that demagnetization has occurred, it suppresses the output of the second rotary motor so that the output of the power supply is at its minimum output power. When the second demagnetization determination unit determines that demagnetization has occurred, it suppresses the output of the first rotary motor so that the output of the power supply becomes the minimum output power.

Images