CN111987974B - Rotary electric machine control device - Google Patents
Rotary electric machine control device Download PDFInfo
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- CN111987974B CN111987974B CN202010391205.2A CN202010391205A CN111987974B CN 111987974 B CN111987974 B CN 111987974B CN 202010391205 A CN202010391205 A CN 202010391205A CN 111987974 B CN111987974 B CN 111987974B
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- temperature
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- voltage command
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- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000003313 weakening effect Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 9
- 238000003079 width control Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Provided is a rotating electrical machine control device which can suppress breakage of elements constituting an inverter even when the temperature of the elements increases. Comprising the following steps: a converter (3) for controlling the output voltage of the DC power supply (1) according to the voltage command value and outputting the output voltage to the DC power supply wiring (6); an inverter (4) having a plurality of switching elements and diodes, for converting DC power on a DC power supply wiring into AC power; and a control circuit (5) for controlling the converter and the inverter based on an external operation command, wherein the control circuit (5) comprises a temperature detection unit (52) for detecting the temperature of the switching element or the diode of the inverter (4), and a voltage command setting unit (51) for adjusting the voltage command value based on the temperature output from the temperature detection unit (52), and the voltage command setting unit (51) sets the voltage command value to be lower when the temperature of the switching element or the diode output from the temperature detection unit (52) is higher than a predetermined temperature.
Description
Technical Field
The present application relates to a rotating electrical machine control device.
Background
In a rotating electrical machine control device having a drive circuit including a converter and an inverter, when the temperature of a switching element of the inverter increases, switching loss increases.
On the other hand, the element voltage resistance of the switching element of the inverter has such a temperature dependence that decreases with a decrease in element temperature. The following techniques are known: the lower the element temperature of the switching element is, the lower the upper limit value of the input voltage of the driving circuit is set, and the output voltage of the dc voltage is set so as not to exceed the set upper limit value of the input voltage in response to a request from the electric load, thereby reducing the switching loss of the driving circuit (see patent document 1).
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open publication No. 2010-75048
Disclosure of Invention
Technical problem to be solved by the invention
In patent document 1, the voltage of the dc power supply wiring increases as the temperature of the switching element of the inverter increases, and the switching loss of the inverter increases in proportion to the voltage of the dc power supply wiring. In addition, if the temperature of the switching element of the inverter increases, the switching element may be damaged in the worst case.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a rotating electrical machine control device capable of suppressing breakage of a switching element constituting a drive circuit of an inverter even when the temperature of the switching element increases.
Technical proposal adopted for solving the technical problems
The rotating electrical machine control device according to the present invention includes: a converter configured to control the 1 st switching element according to a voltage command value so as to output an output voltage of the direct-current power supply to the direct-current power supply wiring; an inverter having a plurality of 2 nd switching elements and diodes connected in parallel with the 2 nd switching elements, the inverter converting direct-current power on a direct-current power supply wiring into alternating-current power; and a control circuit for controlling the switching elements of the converter and the inverter based on an external operation command, wherein the control circuit includes a temperature detection means for detecting the temperature of the switching elements or diodes of the inverter, and a voltage command setting means for adjusting a voltage command value based on the temperature of the switching elements or diodes output from the temperature detection means, and the voltage command setting means sets the voltage command value to be lower than a voltage command value calculated based on the operation command when the temperature of the switching elements or diodes output from the temperature detection means is higher than a predetermined temperature.
Effects of the invention
In the present application, since the voltage of the dc power supply wiring is reduced when the temperature of the switching element of the inverter is high, the temperature of the switching element of the inverter can be reduced, and breakage of the switching element can be suppressed.
Drawings
Fig. 1 is a configuration diagram of a rotary electric machine control device according to embodiment 1.
Fig. 2 is a block diagram of a voltage command setting means constituting a control circuit of the device according to embodiment 1.
Fig. 3 is a flowchart of a process of the voltage limit amount calculation unit constituting the control circuit of the device according to embodiment 1.
Fig. 4 is a flowchart illustrating a relationship between the switching element temperature and the dc power supply wiring voltage in the control device according to embodiment 1.
Fig. 5 is a block diagram of a weak current control unit constituting a control circuit of the control device according to embodiment 2.
Fig. 6 is a flowchart illustrating the operation of the control device according to embodiment 2.
Detailed Description
Embodiment 1.
A rotating electrical machine control device according to embodiment 1 of the present application will be described below with reference to fig. 1 to 4.
Fig. 1 is a diagram illustrating a configuration of a rotary electric machine control device according to embodiment 1, and fig. 2 is a block diagram of voltage command setting means constituting the control device.
In fig. 1, a drive circuit including a converter 3 and an inverter 4 is connected between a dc power supply 1 and a motor 2 as a rotating electrical machine. A control circuit 5 is also provided for controlling the converter 3 and the inverter 4 based on an external operation instruction setting.
The converter 3 boosts the dc voltage from the dc power supply 1, and the inverter 4 converts the dc voltage boosted by the converter 3 into an ac voltage. The control circuit 5 controls the inverter 4 and the converter 3 to drive and control the motor 2 based on an operation command such as a requested torque such as a torque and a requested rotational speed, which are output from a higher-level control unit (ECU) not shown.
The converter 3 is configured by switching elements S1 and S2 connected in series and diodes D1 and D2 connected in parallel to the respective switching elements S1 and S2, and is connected in series between the dc power supply 1 and a dc power supply wiring 6 as an input side of the inverter 4. The converter 3 is a device for variably controlling a voltage obtained by applying a voltage outputted from the dc power supply 1 to the dc power supply wiring 6 based on a voltage command value such as a Pulse Width Control (PWC) signal outputted from the voltage command setting unit 51 of the control circuit 5.
In the inverter 4, a U-phase arm is configured by switching elements S3 and S4 connected in series, a V-phase arm is configured by switching elements S5 and S6 connected in series, a W-phase arm is configured by switching elements S7 and S8 connected in series, and the inverter 4 is connected in series between the dc power supply wiring 6 and the motor 2. The switching elements S3 to S8 are connected in parallel with the diodes D3 to D8. The inverter 4 converts a direct-current voltage into an alternating-current voltage based on a Pulse Width Control (PWC) signal or the like output from the control circuit 5.
The connection point of the switching elements S3 to S8 connected in series of the inverter 4 is connected to the armature winding of the motor 2.
The switching elements S3 to S8 of the inverter 4 are provided with a temperature-voltage converter 7 such as a thermistor capable of converting temperature into voltage (fig. 1 shows only the portion of the switching element S6, but is actually provided in all the switching elements).
The control circuit 5 is shown in fig. 1 as only the voltage command setting unit 51 and the temperature detecting unit 52, but includes a circuit for generating a Pulse Width Control (PWC) signal for controlling the on/off of the switching elements S1 and S2 of the converter 3 and the switching elements S3 to S8 of the inverter 4 based on operation commands such as a request torque and a request rotational speed output from the host ECU.
The voltage detected by the temperature-voltage converter 7 is input to the temperature detection unit 52 of the control circuit 5, and the temperature detection unit 52 performs temperature detection of the switching elements S3 to S8 by performing calculation from the voltage to the temperature.
Voltage command setting section 51 outputs a voltage command value based on an operation command such as a switching element temperature output from temperature detecting section 52, torque output from a host ECU, and rotational speed, controls switching elements S1 and S2 of converter 3, and sets a voltage applied to dc power supply wiring 6.
The motor 2 can generate torque by supplying power obtained by converting dc power into ac power by the inverter 4 to the armature winding, and can be used for an electric vehicle such as a hybrid vehicle or an electric car.
Fig. 2 is a block diagram illustrating a configuration of voltage command setting means 51 used in control circuit 5 according to embodiment 1 of the present application.
The voltage command setting means 51 is constituted by a voltage calculating unit 51a, a voltage limiting amount calculating unit 51b, and a limiting processing unit 51c, and is configured to be able to set the voltage command value of the converter 3 to be low (the on ratio of the switching elements S1, S2 becomes small, etc.) when the switching element temperature of the inverter 4 is higher than a predetermined temperature.
The voltage calculation unit 51a calculates and outputs a voltage command value before restriction based on an operation command output from the host ECU or the like. The voltage limit amount calculation unit 51b calculates and outputs a limit amount by which the voltage of the pre-limit voltage command value can be limited, based on the switching element temperature of the inverter 4. The limit processing unit 51c can reduce the output voltage command value by subtracting the limit amount from the pre-limit command value.
Fig. 3 is a diagram showing a flow of processing by the voltage limit amount calculation unit 51b provided in the voltage command setting unit 51 of the control circuit 5, and fig. 4 is a diagram showing a voltage of the dc power supply wiring 6 with respect to a switching element temperature of the inverter 4.
As shown in fig. 3, when the switching element temperature becomes equal to or higher than a predetermined temperature, the voltage limit amount calculation unit 51b increases the limit amount. By increasing the limit amount, the voltage command value for the converter 3 can be set low, and as a result, as shown in fig. 4, the voltage of the dc power supply wiring 6, which is the output of the converter 3, can be reduced.
This reduces switching loss generated in the switching elements S3 to S8 of the inverter 4 in proportion to the voltage of the dc power supply wiring 6. By reducing the switching loss, the temperature rise of the switching elements S3 to S8 can be suppressed, and the element damage due to heat generation can be suppressed.
In the control device according to embodiment 1 of the present application, the temperature of the switching elements S3 to S8 of the inverter 4 is detected as the temperature detection of the switching elements themselves, but the temperatures of the switching elements S3 to S8 may be estimated by detecting the temperatures of the diodes D3 to D8 connected in parallel to the switching elements S3 to S8. Further, a temperature-voltage converter 7 such as a thermistor may be provided for both the switching elements S3 to S8 and the diodes D3 to D8, and the temperatures of the switching elements S3 to S8 and the diodes D3 to D8 may be detected.
When the temperature of the diodes D3 to D8 is high, the switching loss generated in the diodes D3 to D8 is also reduced by reducing the voltage of the dc power supply wiring 6, so that the temperature rise of the diodes D3 to D8 can be suppressed, and the breakage of the elements of the diodes D3 to D8 can be similarly suppressed.
According to this configuration, not only the temperature rise of the switching elements S3 to S8 of the inverter 4 but also the temperature rise of the diodes D3 to D8 can be suppressed, and element damage due to heat generation can be suppressed.
Embodiment 2.
Next, a rotating electrical machine control device according to embodiment 2 of the present application will be described with reference to fig. 5 and 6.
The rotating electrical machine control device according to embodiment 2 is a device in which a low-current control unit 53 as shown in fig. 5 is further provided to the control circuit 5 according to embodiment 1, and fig. 5 is a block diagram of the low-current control unit 53.
In the rotating electrical machine control device according to embodiment 2, when the temperature of the switching elements S3 to S8 of the inverter 4 is higher than a predetermined temperature, the field weakening current of the motor 2 is set to be larger than a value determined based on an operation command, and thus the voltage rise of the dc power supply wiring 6 can be suppressed, and the field weakening current control unit 53 includes a field weakening current operation unit 53a and a control unit 53b.
The weak current calculation unit 53a receives an operation command from the host ECU, the element temperatures of the switching elements S3 to S8 of the inverter 4, and the voltage of the dc power supply wiring 6, and calculates the weak current of the motor 2. The control unit 53b generates voltage command values for the switching elements S3 to S8 of the inverter 4 based on the output from the weak current operation unit 53 a.
Fig. 6 (a) is a graph showing a relationship between the operation command and the element temperatures of the switching elements S3 to S8 and the voltage of the dc power supply wiring 6, and fig. 6 (b) is a graph showing a relationship in which the field weakening current increases when the element temperatures of the switching elements S3 to S8 are high.
As shown in fig. 6 (a), when the operation command is on the horizontal axis and the voltage of the dc power supply line 6 is on the vertical axis, the solid line a is required when the temperature of the switching element is low, and the solid line B is required when the temperature of the switching element is high.
At this time, as shown in fig. 6 (B), even when the rotation speed of the operation command is low, the absolute value of the field weakening current is set to be large as in the solid line B when the switching element temperature is high, so that the voltage of the dc power supply wiring 6 is reduced. On the other hand, when the switching element temperature is low, the field weakening current is increased only when the requested rotation speed of the operation command is high as in the solid line a.
When the field weakening current is increased, the voltage applied to the motor 2 by the inverter 4 can be reduced, and therefore the element temperatures of the switching elements S3 to S8 of the inverter 4 can be reduced.
By performing the above-described processing, the voltage rise of the dc power supply wiring 6 can be suppressed, and the voltage of the dc power supply wiring 6 becomes equal to or higher than the voltage of the dc power supply 1, so that the uncontrollable switching state of the inverter 4 can be suppressed.
Thus, when the temperature of the switching elements S3 to S8 of the inverter 4 is higher than the predetermined temperature, the field weakening current of the motor 2 is increased when the voltage of the dc power supply wiring 6 is set low, whereby the voltage of the dc power supply wiring 6 can be suppressed, and the switching controllable state of the inverter 4 can be maintained.
The present disclosure describes various exemplary embodiments and examples, but the various features, aspects and functions described in 1 or more embodiments are not limited to the application of the specific embodiments and can be applied to the embodiments alone or in various combinations.
Accordingly, numerous modifications, not illustrated, are contemplated as falling within the scope of the disclosed technology. For example, the case where at least 1 component is modified, added or omitted, and the case where at least 1 component is extracted and combined with the components of the other embodiments are also included.
Description of the reference numerals
1: the direct current power supply is provided with a direct current power supply,
2: an electric motor (rotating electric machine),
3: the power of the converter is converted to power,
4: an inverter is provided with a first inverter and a second inverter,
5: the control circuitry is configured to control the operation of the control circuitry,
6: the direct-current power supply wiring is provided,
7: a temperature-voltage converter is provided with a temperature-voltage converter,
51: a voltage command setting unit for setting the voltage command,
52: a temperature detecting unit for detecting the temperature of the liquid crystal,
51a: a voltage operation unit for performing a voltage operation on the voltage,
51b: a voltage limit amount calculation unit for calculating the voltage limit amount,
51c: a restriction processing section for restricting the movement of the first member,
53: a weak-current control part,
53a: a weak-current operation part, which is used for operating the current sensor,
53b: the control part is used for controlling the control part to control the control part,
S1-S8: the switching element is arranged such that,
D1-D8: a diode.
Claims (2)
1. A rotary electric machine control apparatus, characterized by comprising:
a converter configured to control the 1 st switching element according to a voltage command value so as to output an output voltage of the direct-current power supply to the direct-current power supply wiring;
an inverter having a plurality of 2 nd switching elements and diodes connected in parallel with the 2 nd switching elements, the inverter converting the dc power on the dc power supply wiring into ac power; and
a control circuit that controls switching elements of the converter and the inverter based on an external operation command,
the control circuit has a temperature detecting unit for detecting the temperature of a switching element or a diode of the inverter, and a voltage command setting unit for adjusting the voltage command value based on the temperature of the switching element or the diode output by the temperature detecting unit,
the voltage command setting means sets the voltage command value to be lower than the voltage command value calculated based on the operation command when the temperature of the switching element or diode output by the temperature detecting means is higher than a predetermined temperature,
the voltage command setting unit includes:
a voltage calculation unit that calculates a pre-restriction voltage command value based on the operation command;
a voltage limit amount calculation unit that calculates a limit amount of a voltage that can limit the pre-limit voltage command value, based on a temperature of a switching element or a diode of the inverter; and
And a limitation processing unit that outputs a voltage command value obtained by subtracting the limitation amount from the voltage command value before limitation.
2. The rotating electrical machine control device according to claim 1, wherein,
the control circuit includes a weak current control section of the rotating electric machine,
the field weakening current control unit controls the switching element of the inverter so that the field weakening current of the rotating electrical machine is set to be larger than a value determined based on the operation command when the temperature of the switching element or the diode output from the temperature detection unit is higher than a predetermined temperature.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-096530 | 2019-05-23 | ||
| JP2019096530A JP6800278B2 (en) | 2019-05-23 | 2019-05-23 | Rotating electric machine control device |
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| Publication Number | Publication Date |
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| CN111987974A CN111987974A (en) | 2020-11-24 |
| CN111987974B true CN111987974B (en) | 2024-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010391205.2A Active CN111987974B (en) | 2019-05-23 | 2020-05-11 | Rotary electric machine control device |
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| JP (1) | JP6800278B2 (en) |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009232604A (en) * | 2008-03-24 | 2009-10-08 | Aisin Aw Co Ltd | Rotating electric machine control system |
| JP2011066989A (en) * | 2009-09-16 | 2011-03-31 | Denso Corp | Power conversion device |
| CN103222174A (en) * | 2010-12-02 | 2013-07-24 | 三菱电机株式会社 | Power conversion apparatus |
| CN104272582A (en) * | 2012-05-11 | 2015-01-07 | 本田技研工业株式会社 | Power source control device for rotating electrical machine |
| KR101694213B1 (en) * | 2015-11-27 | 2017-01-09 | 현대자동차주식회사 | Motor controlling device for vehicle and control method thereof |
-
2019
- 2019-05-23 JP JP2019096530A patent/JP6800278B2/en active Active
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2020
- 2020-05-11 CN CN202010391205.2A patent/CN111987974B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009232604A (en) * | 2008-03-24 | 2009-10-08 | Aisin Aw Co Ltd | Rotating electric machine control system |
| JP2011066989A (en) * | 2009-09-16 | 2011-03-31 | Denso Corp | Power conversion device |
| CN103222174A (en) * | 2010-12-02 | 2013-07-24 | 三菱电机株式会社 | Power conversion apparatus |
| CN104272582A (en) * | 2012-05-11 | 2015-01-07 | 本田技研工业株式会社 | Power source control device for rotating electrical machine |
| KR101694213B1 (en) * | 2015-11-27 | 2017-01-09 | 현대자동차주식회사 | Motor controlling device for vehicle and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6800278B2 (en) | 2020-12-16 |
| JP2020191745A (en) | 2020-11-26 |
| CN111987974A (en) | 2020-11-24 |
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