JP7205370B2 - Model characteristics calculation device, model characteristics calculation method, and program - Google Patents

Description

The present invention relates to a technique for calculating characteristics of a model of an electric motor or generator in simulation.

There is a model characteristic calculation device that calculates the characteristics of a model of a motor or generator using three-dimensional analysis. For example, see Patent Document 1.

JP 2014-7079 A

However, since the model characteristic calculation device performs three-dimensional analysis, the characteristics of the model can be approximated to the characteristics of the actual motor. There is concern that it will

Accordingly, an object of one aspect of the present invention is to bring the characteristics of a model of an electric motor or generator closer to the characteristics of an actual electric motor or generator, and reduce the amount of calculation when calculating the characteristics of the model.

A model characteristic calculation device according to one aspect of the present invention is a model characteristic calculation device for calculating characteristics of a model of an electric motor or a generator, comprising: a first variable calculation unit; a second variable calculation unit; A magnetic flux derivation section and a magnetic flux correction section are provided.

The first variable calculator calculates a first variable related to the current flowing through the coil of the model.
The second variable calculator calculates a second variable related to the angular velocity of the rotor of the model.

The magnetic flux derivation unit uses the first variable to calculate or refer to the magnetic flux generated in the model.
The magnetic flux correction unit uses the first variable and the second variable to correct the magnetic flux calculated or referred to by the magnetic flux derivation unit so that the characteristics of the model approach the characteristics of the actual motor or generator.

This makes it possible to calculate the characteristics of the model without performing a three-dimensional analysis, taking into account the effects of eddy currents generated in the core on the magnetic field and changes in the magnetization characteristics of the core due to the angular velocity of the rotor. In addition, it is possible to bring the characteristics of the model closer to the characteristics of the actual motor and reduce the amount of calculation when calculating the characteristics of the model.

Further, the model characteristic calculation device includes a memory that stores information in which the first variable and the second variable are associated with the corrected magnetic flux, and the magnetic flux correction unit stores the information stored in the memory. The corrected magnetic flux corresponding to the first variable calculated by the first variable calculation unit and the second variable calculated by the second variable calculation unit may be acquired by referring to .

As a result, the amount of calculation when correcting the magnetic flux can be reduced, so the amount of calculation when calculating the characteristics of the model can be further reduced.

In addition, the magnetic flux correction unit is calculated or referred to by the magnetic flux derivation unit using a polynomial in which the order of the current and angular velocity as variables is set so that the characteristics of the model approach the characteristics of the actual motor or generator. It may be configured to correct the magnetic flux.

According to the present invention, the characteristics of the model of the electric motor or generator can be brought closer to the characteristics of the actual electric motor or generator, and the amount of calculation when calculating the characteristics of the model can be reduced.

It is a figure which shows an example of the model characteristic calculation apparatus of embodiment. It is a figure which shows an example of a model.

Embodiments will be described in detail below with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a model characteristic calculation device according to an embodiment.

A model characteristic calculation device 1 shown in FIG. 1 calculates, for example, in a simulation, the characteristics of a model of an electric motor or generator mounted on a vehicle such as an electric vehicle or a hybrid vehicle.

The model characteristic calculation device 1 also includes a processor 2 , a memory 3 , an input/output interface 4 and an input/output unit 5 . The hardware constituting the model characteristic calculation device 1 may be realized using a cloud or the like.

The processor 2 is composed of, for example, a Central Processing Unit (CPU), a multicore CPU, a programmable device (Field Programmable Gate Array (FPGA) or Programmable Logic Device (PLD)), or the like. In addition, the processor 2 executes a program stored in the memory 3 to perform each component (for example, a current calculation unit 21, a magnetic flux derivation unit 22, a torque calculation, which will be described later) that constitutes a model of the electric motor or the generator. 23, iron loss calculator 24, loss calculator 25, torque corrector 26, angular velocity calculator 27, iron loss corrector 28, and magnetic flux corrector 29). When distributing the program, for example, recording media such as Digital Versatile Disc (DVD) and Compact Disc Read Only Memory (CD-ROM) on which the program is recorded are sold. Alternatively, the program may be recorded in the storage device of the server computer, and the program may be transferred from the server computer to another computer via the network.

The memory 3 is composed of, for example, Read Only Memory (ROM) or Random Access Memory (RAM), and stores magnetic flux calculation results 31, torque calculation results 32, iron loss calculation results 33, etc. in addition to the above programs. .

The magnetic flux calculation result 31 is information indicating the result of calculation (FEM (Finite Element Method), etc.) performed in advance, and includes the current (Id, Iq) flowing in the coils of the model of the motor or generator, and the This information is associated with the magnetic flux (Φd, Φq) generated in the machine model.

The torque calculation result 32 is information indicating the result of a calculation (such as FEM) that has been performed in advance. This information is associated with torque (T).

The iron loss calculation result 33 is information indicating the result of calculation (such as FEM) performed in advance, and the current (Id, Iq) flowing in the coils of the model of the motor or generator and the This information is associated with the generated iron loss (Wi).

The input/output interface 4 sends information input from the input/output unit 5 by the user to the processor 2 . The input/output interface 4 also sends information sent from the processor 2 to the input/output unit 5 .

The input/output unit 5 can be, for example, a keyboard, a pointing device (such as a mouse), a touch panel, a display, a printer, and the like.

A communication interface 6 is an interface for connecting to a network such as a Local Area Network (LAN) or the Internet.

FIG. 2 is a diagram showing an example of a model of an electric motor or generator. The model shown in FIG. 2 is a model of a three-phase (U-phase, V-phase, W-phase) AC motor or generator.

The model shown in FIG. 2 includes a current calculation unit 21, a magnetic flux derivation unit 22, a torque calculation unit 23, an iron loss calculation unit 24, a loss calculation unit 25, a torque correction unit 26, an angular velocity calculation unit 27, It includes an iron loss correction section 28 and a magnetic flux correction section 29 .

The current calculator 21 (first variable calculator) calculates target voltages (Vu, Vv, Vw) applied to model coils, model coil inductances (Ld, Lq), model rotor electrical angular velocity (ω), , the resistance (R) of the model coil, and the electromotive force (Ke) generated in the model, the current (Id, Iq) flowing through the model coil is calculated as the first variable. For example, the current calculator 21 coordinates-transforms the target voltages (Vu, Vv, Vw) into the target voltages (Vd, Vq) in order to represent the torque component and the magnetic field component, and uses the voltage equation shown in Equation 1 below, Calculate the current (Id, Id).

The current calculator 21 calculates the inductances (Ld, Lq) using the currents (Id, Iq) and the magnetic fluxes (Φd′, Φq′) corrected by the magnetic flux corrector 29 . Further, the current calculator 21 may correct the resistance (R) of the coil of the model and the electromotive force (Ke) generated in the model according to the temperature of the model.

The magnetic flux derivation unit 22 uses the currents (Id, Iq) calculated by the current calculation unit 21 to calculate or refer to the magnetic fluxes (Φd, Φq) generated in the model. For example, the magnetic flux derivation unit 22 refers to the magnetic flux calculation result 31 stored in the memory 3, and converts the magnetic flux (Φd, Φq) corresponding to the current (Id, Iq) calculated by the current calculation unit 21 into a model The magnetic flux (Φd, Φq) generated at Alternatively, information indicating the correspondence between the current (Id, Iq) calculated by the current calculation unit 21 and the magnetic flux (Φd, Φq) generated in the model is stored in the memory 3 in advance, and the magnetic flux derivation unit 22 The information may be used to refer to the magnetic flux (Φd, Φq) corresponding to the current (Id, Iq). The correspondence may be obtained by calculation using, for example, the permeance method, or may be obtained by calculation using electromagnetic field analysis.

The torque calculator 23 uses the currents (Id, Iq) calculated by the current calculator 21 to calculate the torque (T) generated in the model. For example, the torque calculation unit 23 refers to the torque calculation result 32 stored in the memory 3, and generates a torque (T) corresponding to the current (Id, Iq) calculated by the current calculation unit 21 in the model. Let it be torque (T).

The iron loss calculator 24 uses the currents (Id, Iq) calculated by the current calculator 21 to calculate the iron loss (Wi) occurring in the model. For example, the iron loss calculation unit 24 refers to the iron loss calculation result 33 stored in the memory 3, and calculates the iron loss (Wi) corresponding to the current (Id, Iq) calculated by the current calculation unit 21 as Let it be the iron loss (Wi) occurring in the model.

The loss calculator 25 calculates a copper loss (Wc) occurring in the model using the currents (Id, Iq) calculated by the current calculator 21 and the resistance (R) of the coil of the model. Also, the loss calculator 25 uses the electrical angular velocity (ω) calculated by the angular velocity calculator 27 to calculate a mechanical loss (Wm) occurring in the model.

The torque correction unit 26 corrects the torque (T) calculated by the torque calculation unit 23 to torque (T′) using the currents (Id, Iq) calculated by the current calculation unit 21 .

The angular velocity calculator 27 (second variable calculator) uses the torque (T′) corrected by the torque corrector 26 to calculate the electrical angular velocity (ω) of the model rotor as a second variable.

The iron loss correction unit 28 corrects the iron loss calculated by the iron loss calculation unit 24 using the electrical angular velocity (ω) calculated by the angular velocity calculation unit 27 and the current (Id, Iq) calculated by the current calculation unit 21. (Wi) is corrected to iron loss (Wi').

The magnetic flux correction unit 29 uses the current (Id, Iq) calculated by the current calculation unit 21 and the angular velocity (ω) calculated by the angular velocity calculation unit 27 to correct the magnetic flux (Φd , Φq) are corrected to magnetic fluxes (Φd′, Φq′). For example, the magnetic flux correction unit 29 adjusts the model characteristics (inductance (Ld, Lq), copper loss (Wc), torque (T), iron loss (Wi), etc.) to approximate the characteristics of the actual motor or generator. Then, the magnetic fluxes (Φd, Φq) are corrected to the magnetic fluxes (Φd′, Φq′) using polynomials in which the orders of the currents (Id, Iq) and the angular velocity (ω) are set as variables.

As described above, in the model characteristic calculation device 1 of the embodiment, the magnetic flux derivation unit 22 uses the current (Id, Iq) calculated by the current calculation unit 21 and the angular velocity (ω) calculated by the angular velocity calculation unit 27 to The calculated or referenced magnetic flux (Φd, Φq) is corrected to the magnetic flux (Φd', Φq'). As a result, the characteristics of the model can be calculated by taking into account the effect of eddy currents generated in the core on the magnetic field and changes in the magnetization characteristics of the core due to the electrical angular velocity of the rotor without performing a three-dimensional analysis. Therefore, the characteristics of the model (inductance (Ld, Lq), copper loss (Wc), torque (T), iron loss (Wi), etc.) are brought closer to the characteristics of the actual motor, and the model characteristics are calculated. The amount of calculation can be reduced.

Moreover, the present invention is not limited to the above embodiments, and various improvements and modifications are possible without departing from the gist of the present invention.

<Modification 1>
The current calculation unit 21 uses the currents (Id, Iq) as the first variables, three-phase alternating currents (Iu, Iv, Iw), two-phase currents (Iα, Iβ), currents expressed in polar coordinates (I, β), or may be converted to a current expressed in another coordinate system. When configured in this manner, the magnetic flux derivation unit 22, the torque calculation unit 23, and the iron loss calculation unit 24 use the current converted by the current calculation unit 21 to calculate the magnetic flux (Φd, Φq), the torque (T) , and iron loss (Wi) are calculated. The loss calculator 25 uses the current converted by the current calculator 21 to calculate the copper loss (Wc). Further, the magnetic flux correction unit 29 uses the current converted by the current calculation unit 21 and the angular velocity (ω) calculated by the angular velocity calculation unit 27 to convert the magnetic fluxes (Φd, Φq) into magnetic fluxes (Φd′, Φq′). to correct.

<Modification 2>
The model includes a magnetic flux derivation unit 22' as a first variable calculation unit instead of the current calculation unit 21, and the magnetic flux derivation unit 22' uses the magnetic flux equation obtained by integrating the voltage equation over time. , as the first variable, the magnetic flux (Φd, Φq) occurring in the model or transformed into another coordinate system may be calculated. That is, the model shown in FIG. 2 is constructed entirely based on the voltage equation, but may be constructed entirely based on the magnetic flux equation. In this configuration, the torque calculator 23 and the iron loss calculator 24 use the magnetic flux calculated by the magnetic flux lead-out unit 22' to calculate the torque (T) and the iron loss (Wi). Also, the loss calculation unit 25 calculates the copper loss (Wc) using the magnetic flux calculated by the magnetic flux derivation unit 22'. Further, the magnetic flux correcting section 29 uses the angular velocity (ω) calculated by the angular velocity calculating section 27 to correct the magnetic flux calculated by the magnetic flux deriving section 22'.

<Modification 3>
The model includes an electromotive force calculator as a first variable calculator instead of the current calculator 21, and the magnetomotive force calculator uses the magnetomotive forces (Fd, Fq) generated in the model or other It may be configured to calculate the magnetomotive force converted into the coordinate system. When configured in this way, the magnetic flux derivation unit 22, the torque calculation unit 23, and the iron loss calculation unit 24 use the electromotive force calculated by the electromotive force calculation unit to calculate the magnetic flux (Φd, Φq), the torque (T) , and iron loss (Wi) are calculated. Also, the loss calculator 25 calculates a copper loss (Wc) using the electromotive force calculated by the electromotive force calculator. Further, the magnetic flux correction unit 29 corrects the magnetic flux using the magnetomotive force calculated by the magnetomotive force calculation unit and the angular velocity (ω) calculated by the angular velocity calculation unit 27 .

<Modification 4>
The angular velocity calculator 27 may convert the electrical angular velocity (ω) into the rotational speed, frequency, or mechanical angular velocity of the model rotor as a second variable. In this configuration, the iron loss correction unit 28 corrects the iron loss (Wi) to the iron loss (Wi') using the rotation speed, frequency, or mechanical angular velocity converted by the angular velocity calculation unit 27. . Also, the loss calculator 25 calculates a mechanical loss (Wm) using the rotational speed, frequency, or mechanical angular velocity converted by the angular velocity calculator 27 . Further, the magnetic flux correction unit 29 corrects the magnetic flux using the current (Id, Iq) calculated by the current calculation unit 21 and the rotation speed, frequency, or machine speed converted by the angular velocity calculation unit 27 . Alternatively, the magnetic flux correction unit 29 converts the current converted by the current calculation unit 21 (three-phase alternating current (Iu, Iv, Iw), two-phase current (Iα, Iβ), current expressed in polar coordinates (I, β) , or current expressed in another coordinate system) and the rotational speed, frequency, or machine speed converted by the angular velocity calculator 27, the magnetic flux is corrected. Alternatively, the magnetic flux correction unit 29 uses the magnetic flux calculated by the magnetic flux derivation unit 22′ or the magnetomotive force calculated by the electromotive force calculation unit and the rotation speed, frequency, or machine speed converted by the angular velocity calculation unit 28. , to correct the magnetic flux.

<Modification 5>
Information indicating the correspondence relationship between the first variable and the second variable at a certain operating point and the corrected magnetic flux (Φd′, Φq′) is stored in the memory 3, and the magnetic flux correction unit 29 stores the information may be referenced to obtain the corrected magnetic fluxes (Φd′, Φq′) corresponding to the first variable and the second variable.

As a result, the amount of calculation when correcting the magnetic flux (Φd, Φq) can be reduced, so the amount of calculation when calculating the characteristics of the model can be further reduced.

1 model characteristics calculation device 2 memory 3 processor 4 input/output interface 5 input/output unit 6 communication interface 21 current calculation unit 22 magnetic flux derivation unit 23 torque calculation unit 24 iron loss calculation unit 25 loss calculation unit 26 torque correction unit 27 angular velocity calculation unit 28 Iron loss correction unit 29 Magnetic flux correction unit

Claims (5)

A model characteristic calculation device for calculating characteristics of a model of an electric motor or a generator,
a first variable calculation unit that calculates a first variable related to the current flowing through the coil of the model;
a second variable calculator that calculates a second variable related to the angular velocity of the rotor of the model;
a magnetic flux derivation unit that calculates or refers to the magnetic flux generated in the model using the first variable;
A magnetic flux correction unit that corrects the magnetic flux calculated or referred to by the magnetic flux derivation unit using the first variable and the second variable so that the characteristics of the model approach the characteristics of an actual electric motor or generator. When,
with
The first variable calculation unit calculates the inductance of the model coil using the current and the magnetic flux corrected by the magnetic flux correction unit, and calculates the target voltage applied to the model coil, the inductance, the angular velocity, the A model characteristic calculation device, wherein the first variable is calculated using a resistance of a model coil and an electromotive force generated in the model. A model characteristic calculation device for calculating characteristics of a model of an electric motor or a generator,
a first variable calculation unit that calculates a first variable related to the current flowing through the coil of the model;
a second variable calculator that calculates a second variable related to the angular velocity of the rotor of the model;
The first variable and the second variable, and the model corrected using the first variable and the second variable so that the characteristics of the model approach the characteristics of an actual motor or generator. a memory that stores information in which the generated magnetic flux is associated with the corrected magnetic flux;
Magnetic flux correction for obtaining corrected magnetic flux corresponding to the first variable calculated by the first variable calculation unit and the second variable calculated by the second variable calculation unit by referring to the information Department and
with
The first variable calculation unit calculates the inductance of the model using the magnetic flux after correction acquired by the magnetic flux correction unit, and calculates the target voltage applied to the coil of the model, the inductance, the angular velocity, the model A model characteristic calculation device, wherein the first variable is calculated using a resistance of a coil and an electromotive force generated in the model. The model characteristic calculation device according to claim 1,
The magnetic flux correction unit is calculated by the magnetic flux derivation unit using a polynomial in which the order of the current and the angular velocity as variables is set so that the characteristics of the model approach the characteristics of an actual motor or generator. Alternatively, a model characteristic calculation device characterized by correcting the magnetic flux referred to. A model characteristic calculation method for calculating characteristics of a model of an electric motor or a generator in a model characteristic calculation device having a processor, comprising:
The processor
a first variable calculation step of calculating a first variable related to the current flowing through the coil of the model;
a second variable calculation step of calculating a second variable relating to the angular velocity of the rotor of the model;
a magnetic flux derivation step of calculating or referring to the magnetic flux generated in the model using the first variable;
A magnetic flux correction step of correcting the magnetic flux calculated or referred to in the magnetic flux derivation step using the first variable and the second variable so that the characteristics of the model approach the characteristics of an actual electric motor or generator. When,
has
The first variable calculating step calculates the inductance of the model coil using the magnetic flux corrected by the magnetic flux correcting step, and calculates a target voltage applied to the model coil, the inductance, the angular velocity, and the model coil. and the electromotive force generated in the model to calculate the first variable. A program for calculating characteristics of a model of an electric motor or a generator in a model characteristics calculation device comprising a processor, comprising:
to the processor;
The inductance of the model coil is calculated using the magnetic flux corrected by the magnetic flux correction step, and the target voltage applied to the model coil, the inductance, the angular velocity of the model rotor, the resistance of the model coil, and the a first variable calculation step of calculating a first variable related to the current flowing in the coil of the model using the electromotive force generated in the model;
a second variable calculation step of calculating a second variable relating to the angular velocity of the rotor of the model;
a magnetic flux derivation step of calculating or referring to the magnetic flux generated in the model using the first variable;
The magnetic flux correction for correcting the magnetic flux calculated or referred to in the magnetic flux derivation step, using the first variable and the second variable so that the characteristics of the model approach the characteristics of an actual motor or generator. a step;
program to run the

Images