CN111987974A - Rotating electric machine control device - Google Patents
Rotating electric machine control device Download PDFInfo
- Publication number
- CN111987974A CN111987974A CN202010391205.2A CN202010391205A CN111987974A CN 111987974 A CN111987974 A CN 111987974A CN 202010391205 A CN202010391205 A CN 202010391205A CN 111987974 A CN111987974 A CN 111987974A
- Authority
- CN
- China
- Prior art keywords
- temperature
- voltage
- voltage command
- inverter
- switching element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims abstract description 16
- 230000003313 weakening effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 238000003079 width control Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 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
Images
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
Abstract
Provided is a rotating electric machine control device which can suppress damage to elements constituting an inverter even when the temperature of the elements becomes high. The method comprises 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 and converting DC power on a DC power supply line 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) is provided with 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 by 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 by the temperature detection unit (52) is higher than a predetermined temperature.
Description
Technical Field
The present application relates to a rotating electric machine control device.
Background
In a rotating electrical machine control device having a drive circuit including a converter and an inverter, switching loss increases when the temperature of a switching element of the inverter increases.
On the other hand, the element voltage resistance of the switching element of the inverter has such a temperature dependency that the element temperature decreases. The following techniques are known: the lower the element temperature of the switching element, the lower the upper limit value of the input voltage of the drive 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 electrical load, thereby reducing the switching loss of the drive circuit (see patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese patent application laid-open No. 2010-75048
Disclosure of Invention
Technical problem to be solved by the invention
In patent document 1, as the temperature of the switching element of the inverter increases, the voltage of the dc power supply line increases, and the switching loss of the inverter, which is proportional to the voltage of the dc power supply line, increases. Further, if the temperature of the switching element of the inverter becomes high, 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 electric machine control device capable of suppressing damage to switching elements constituting a drive circuit of an inverter even if the temperature of the switching elements becomes high.
Technical scheme for solving technical problem
The present invention relates to a rotating electric machine control device, including: a converter configured to control the 1 st switching element in accordance with a voltage command value to output an output voltage of the dc power supply to a dc power supply wiring; an inverter having a plurality of 2 nd switching elements and diodes connected in parallel to the 2 nd switching elements, for converting a dc power on a dc power supply wiring into an ac power; and a control circuit that controls the converter and the switching elements of the inverter based on an operation command from the outside, the control circuit including a temperature detection unit that detects a temperature of the switching elements or the diodes of the inverter, and a voltage command setting unit that adjusts a voltage command value based on the temperature of the switching elements or the diodes output by the temperature detection unit, the voltage command setting unit setting the voltage command value to be lower than the voltage command value calculated based on the operation command when the temperature of the switching elements or the diodes output by the temperature detection unit is higher than a predetermined temperature.
Effects of the invention
In the present application, since the voltage of the dc power supply line 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 damage to the switching element can be suppressed.
Drawings
Fig. 1 is a configuration diagram of a rotating electric machine control device according to embodiment 1.
Fig. 2 is a block diagram of a voltage command setting unit constituting a control circuit of the apparatus according to embodiment 1.
Fig. 3 is a flowchart of the processing 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 temperature of the switching element and the dc power supply wiring voltage in the control device according to embodiment 1.
Fig. 5 is a block diagram of a field-weakening current control unit constituting a control circuit of the control device according to embodiment 2.
Fig. 6 is a flowchart for explaining the operation of the control device according to embodiment 2.
Detailed Description
A rotating electric 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 rotating electric machine control device according to embodiment 1, and fig. 2 is a block diagram of a voltage command setting unit 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 electric machine. A control circuit 5 for controlling the converter 3 and the inverter 4 based on an operation command from the outside is also provided.
The converter 3 boosts a 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 converter 3 and the inverter 4 based on operation commands such as a requested torque and a requested rotational speed, such as a torque, output from a host control unit (ECU) not shown, to drive and control the motor 2.
The converter 3 includes switching elements S1 and S2 connected in series and diodes D1 and D2 connected in parallel to the switching elements S1 and S2, and is connected in series between the dc power supply 1 and the dc power supply line 6 on the input side of the inverter 4. The converter 3 is a device that variably controls a voltage obtained by applying a voltage output 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 output from a voltage command setting unit 51 of the control circuit 5.
In the inverter 4, the U-phase arm is composed of switching elements S3 and S4 connected in series, the V-phase arm is composed of switching elements S5 and S6 connected in series, the W-phase arm is composed of switching elements S7 and S8 connected in series, and the inverter 4 is connected in series between the dc power supply line 6 and the motor 2. The switching elements S3 to S8 are connected in parallel to 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 points of the switching elements S3 to S8 connected in series in the inverter 4 are connected to the armature winding of the motor 2.
The switching elements S3 to S8 of the inverter 4 are each provided with a temperature-voltage converter 7 such as a thermistor that can convert 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 includes only the voltage command setting means 51 and the temperature detection means 52 shown in fig. 1, but also includes a circuit that generates a Pulse Width Control (PWC) signal for controlling 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 an operation command such as a requested torque and a requested rotational speed output from a higher-level ECU.
The voltage detected by the temperature-voltage converter 7 is input to the temperature detection means 52 of the control circuit 5, and the temperature detection means 52 performs calculation from the voltage to the temperature to detect the temperature of the switching elements S3 to S8.
The voltage command setting means 51 outputs a voltage command value based on the switching element temperature output from the temperature detection means 52, and an operation command such as torque and rotational speed output from a host ECU or the like, and controls the switching elements S1 and S2 of the converter 3 to set the voltage to be applied to the dc power supply line 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 in electric vehicles such as hybrid vehicles and electric cars.
Fig. 2 is a block diagram illustrating the configuration of voltage command setting section 51 used in control circuit 5 according to embodiment 1 of the present application.
The voltage command setting means 51 is configured by a voltage calculation unit 51a, a voltage limit amount calculation unit 51b, and a limit processing unit 51c, and is configured to be able to set the voltage command value of the converter 3 to be low (e.g., the on ratio of the switching elements S1, S2 is small) when the switching element temperature of the inverter 4 is higher than a predetermined temperature.
The voltage calculation unit 51a calculates and outputs the pre-limit voltage command value based on the operation command output from the upper ECU or the like. The voltage limit amount calculation unit 51b calculates and outputs a limit amount of a voltage that can limit the pre-limit voltage command value according to the switching element temperature of the inverter 4. The limitation processing unit 51c can reduce the output voltage command value by subtracting the limitation amount from the pre-limitation command value.
Fig. 3 is a diagram showing a processing flow of the voltage limit amount calculation unit 51b of the voltage command setting means 51 provided in 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, the voltage of the dc power supply wiring 6, which is the output of the converter 3, can be reduced as shown in fig. 4.
This can reduce switching losses generated in the switching elements S3 to S8 of the inverter 4 in proportion to the voltage of the dc power supply line 6. By reducing the switching loss, the temperature rise of the switching elements S3 to S8 can be suppressed, and 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 is detected as the temperature detection of the switching elements S3 to S8 of the inverter 4, but the temperature of the switching elements S3 to S8 may be estimated by detecting the temperature of the diodes D3 to D8 connected in parallel to the switching elements S3 to S8. The 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 temperatures of the diodes D3 to D8 are high, the switching loss generated in the diodes D3 to D8 is also reduced by lowering the voltage of the dc power supply line 6, so that the temperature rise of the diodes D3 to D8 can be suppressed, and the element breakage of the diodes D3 to D8 can be similarly suppressed.
According to this configuration, not only can the temperature rise of the switching elements S3 to S8 of the inverter 4 be suppressed, but also the temperature rise of the diodes D3 to D8 can be suppressed, and element damage due to heat generation can be suppressed.
Next, a rotating electric 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 field weakening 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 field weakening current control unit 53.
The rotating electrical machine control device according to embodiment 2 is a device that can suppress a voltage increase in the dc power supply line 6 by setting the field weakening current of the motor 2 to be larger than a value determined based on an operation command when the temperature of the switching elements S3 to S8 of the inverter 4 is higher than a predetermined temperature, and the field weakening current control unit 53 includes a field weakening current calculation unit 53a and a control unit 53 b.
The field weakening current calculation unit 53a receives an operation command from the upper ECU, the element temperatures of the switching elements S3 to S8 of the inverter 4, and the voltage of the dc power supply line 6, and calculates the field weakening current of the motor 2. The controller 53b generates voltage command values for the switching elements S3 to S8 of the inverter 4 based on the output from the field weakening current calculation unit 53 a.
Fig. 6(a) is a diagram showing a relationship between an operation command and the element temperature of the switching elements S3 to S8 and the voltage of the dc power supply line 6, and fig. 6(b) is a diagram showing a relationship in which the field weakening current is increased when the element temperature of the switching elements S3 to S8 is high.
As shown in fig. 6(a), when the operation command is plotted on the horizontal axis and the voltage of the dc power supply line 6 is plotted on the vertical axis, it is necessary to set the solid line a when the temperature of the switching element is low and set the solid line B 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 shown by the solid line B so as to reduce the voltage of the dc power supply wiring 6 when the temperature of the switching element is high. On the other hand, when the switching element temperature is low, the field-weakening current is increased when the requested rotation speed of the operation command is high as shown by 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 processing, it is possible to suppress a voltage rise of the dc power supply wiring 6, and the voltage of the dc power supply wiring 6 becomes equal to or higher than the voltage of the dc power supply 1, thereby suppressing an uncontrollable switching state of the inverter 4.
Thus, when the temperature of the switching elements S3 to S8 of the inverter 4 is higher than a predetermined temperature, the voltage of the dc power supply line 6 can be suppressed by increasing the field weakening current of the motor 2 when the voltage of the dc power supply line 6 is set to be low, and the switch controllable state of the inverter 4 can be maintained.
Various exemplary embodiments and examples are described in the present disclosure, but the various features, forms, and functions described in 1 or more embodiments are not limited to the application to the specific embodiments, and may be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not illustrated are also assumed to be included in the technical scope disclosed in the present application. 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 symbols
1: a direct-current power supply is arranged in the shell,
2: an electric motor (a rotary electric machine),
3: the number of the converters is such that,
4: an inverter for converting the voltage of the power source into a DC voltage,
5: a control circuit for controlling the operation of the electronic device,
6: the wiring of a direct-current power supply,
7: a temperature-voltage converter for converting a temperature of the power supply into a voltage,
51: a voltage command setting unit for setting a voltage command,
52: a temperature detection unit for detecting the temperature of the liquid crystal,
51 a: a voltage operation unit for operating the voltage of the power supply,
51 b: a voltage limit amount calculation unit for calculating a voltage limit amount,
51 c: a limiting processing unit for limiting the number of times,
53: a flux-weakening current control part for controlling the flux-weakening current,
53 a: a weak magnetic current computing part for computing the weak magnetic current,
53 b: a control part for controlling the operation of the display device,
S1-S8: a switching element for switching the switching element between a first state and a second state,
D1-D8: and a diode.
Claims (3)
1. A rotating electric machine control device characterized by comprising:
a converter configured to control the 1 st switching element in accordance with a voltage command value to output an output voltage of the dc power supply to a dc power supply wiring;
an inverter having a plurality of 2 nd switching elements and diodes connected in parallel to the 2 nd switching elements, for converting the dc power on the dc power supply wiring into ac power; and
a control circuit for controlling the switching elements of the converter and the inverter based on an external operation command,
the control circuit includes a temperature detection unit that detects a temperature of a switching element or a diode of the inverter, and a voltage command setting unit that adjusts the voltage command value based on the temperature of the switching element or the diode output by the temperature detection unit,
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 element or the diode output by the temperature detection means is higher than a predetermined temperature.
2. The rotating electric machine control apparatus according to claim 1,
the voltage command setting unit includes:
a voltage calculation unit that calculates a pre-limit voltage command value based on the control command;
a voltage limit amount calculation unit that calculates a limit amount by which a voltage of the pre-limit voltage command value can be limited, 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 pre-limitation voltage command value.
3. The rotating electric machine control apparatus according to claim 1 or 2,
the control circuit includes a field-weakening current control section of the rotating electrical machine,
the field weakening current control unit controls the switching element of the inverter so that a 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 by the temperature detection unit is higher than a predetermined temperature.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019096530A JP6800278B2 (en) | 2019-05-23 | 2019-05-23 | Rotating electric machine control device |
| JP2019-096530 | 2019-05-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111987974A true CN111987974A (en) | 2020-11-24 |
| CN111987974B CN111987974B (en) | 2024-03-26 |
Family
ID=73441733
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010391205.2A Active CN111987974B (en) | 2019-05-23 | 2020-05-11 | Rotary electric machine control device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6800278B2 (en) |
| CN (1) | CN111987974B (en) |
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
-
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 |
|---|---|
| JP2020191745A (en) | 2020-11-26 |
| CN111987974B (en) | 2024-03-26 |
| JP6800278B2 (en) | 2020-12-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5217579B2 (en) | Electric motor control method and control apparatus | |
| JP5630474B2 (en) | Inverter | |
| JP6330057B2 (en) | Power conversion device and electric power steering device using the same | |
| CN111245323B (en) | Motor control method and device, computer readable storage medium and electrical equipment | |
| JP6107936B2 (en) | Power converter | |
| WO2014167714A1 (en) | Power conversion device, motor drive device provided therewith, fan provided with said motor drive device, compressor, and air conditioner, refrigerator, and freezer provided with said fan and compressor | |
| WO2014097804A1 (en) | Inverter device | |
| AU2017336112A1 (en) | Control device for power converter | |
| JP6425898B2 (en) | Inverter control device and method thereof | |
| US20190367080A1 (en) | Control device and electric power steering device using same | |
| JP6449129B2 (en) | Power converter | |
| JP6852539B2 (en) | Rotating machine control device | |
| KR101473097B1 (en) | Motor control apparatus and motor control method | |
| CN110011573B (en) | Motor control device | |
| JP2005253213A (en) | Method and device for controlling multi-axis motor | |
| CN111987974B (en) | Rotary electric machine control device | |
| JP2020014326A (en) | Electric power conversion device | |
| JP2015201956A (en) | Vector control device, inverter with the same integrated therein, and set device of the inverter with the same integrated therein and motor | |
| US11296625B2 (en) | Control device and control method for synchronous electric motor | |
| JP2009077606A (en) | Power generator and related controller for electric motor | |
| JPWO2016084170A1 (en) | Motor control device and control method | |
| KR101901544B1 (en) | Motor control device and motor control method | |
| WO2016194140A1 (en) | Elevator control device and elevator control method | |
| JP2013135516A (en) | Electric power conversion system and air conditioner | |
| JP2011166989A (en) | Drive device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |