JP2003153588A - Motor driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To utilize each inverter effectively at the time of driving a plurality of motors by means of a plurality of inverters. SOLUTION: In the motor driver for switching the relation of connection between first and second motors 1, 2 and first and second inverter circuits 22, 23 at a connection switching section 4, first and second control sections 51, 52 judges the current relation of connection between the first and second motors 1, 2 and the first and second inverter circuits 22, 23 and control the connection switching section 4 to switch the relation of connection between the first and second motors 1, 2 and the first and second inverter circuits 22, 23 such that the lifetime of first and second power modules 32, 42 is averaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive device having a plurality of inverters corresponding to a plurality of motors and controlling each inverter to drive a plurality of motors.

[0002]

2. Description of the Related Art Conventionally, a motor drive device for driving a plurality of motors is provided with respective inverters corresponding to the respective motors, and the respective plurality of motors are driven by controlling the respective inverters. It was

[0003]

In the above-mentioned conventional motor drive device, when one motor is a drive motor for an electric vehicle and the other motor is a motor exclusively for regeneration, use of each motor is performed. Frequency may vary. In such a case, the life of the motor drive device is determined by the life of the power module of the inverter connected to the frequently used motor.

That is, in such a motor drive device, in order to reduce costs, the power module of one inverter is often the same as the power module of the other inverter, and a circuit constituting the motor drive device is used. Etc. are often shared. Therefore, as described above, when one of the inverters has reached the end of its life, it is necessary to replace the entire motor drive device, regardless of whether the other inverter can be used, and the life of the power module cannot be effectively utilized. .

Further, in the conventional motor drive device, when one motor is operating under high load, even if the load of the other motor is low, the heat generated by the inverter driving the motor operating under high load is generated. Therefore, the output of the motor is controlled to be reduced, and the two inverters cannot be effectively used.

Therefore, the present invention has been proposed in view of the above-mentioned circumstances, and provides a motor drive device capable of effectively utilizing each inverter when driving a plurality of motors by a plurality of inverters. To do.

[0007]

In order to solve the above-mentioned problems, in the motor drive device according to the first aspect, the motor module is connected to any one of a plurality of motors to drive the power module, A plurality of inverters for supplying electric power to the connected motors, the above-mentioned motors, connection determining means for determining a connection relationship between the inverters, the motors and the inverters determined by the connection determining means, Motor drive control means for controlling each inverter so as to control the electric power supplied to each motor, connection switching means for switching the connection relationship between the plurality of motors and the plurality of inverters, and the connection. The motors and the inverters are controlled so as to control the switching means to equalize the lives of the power modules that form the inverters. Wherein the in and a switching control means for switching the connection relationship.

A motor drive device according to a second aspect of the present invention is the motor drive device according to the first aspect, wherein the switching control means acquires the temperature of the power module of each of the inverters, and the acquired temperature is equal to or higher than a predetermined temperature. In this case, the connection switching means is controlled so that the motor connected to the inverter including the power module is connected to another inverter.

According to a third aspect of the present invention, there is provided the motor drive apparatus according to the second aspect, wherein the switching control means calculates a temperature difference between the power modules of the respective inverters, and the calculated temperature difference is predetermined. If the temperature difference is more than
The connection switching means is controlled so that the motor connected to the inverter including the power module is connected to another inverter.

According to a fourth aspect of the present invention, there is provided the motor driving apparatus according to the third aspect, wherein the switching control means has passed from a switching time point at which the connection relationship between the motors and the inverters has been switched. When the time is equal to or longer than a predetermined time, the connection switching means is controlled to connect the motor connected to the inverter including the power module having the predetermined temperature or higher to another inverter.

A motor drive device according to a fifth aspect is the motor drive device according to any one of the first to fourth aspects, wherein the switching control means comprises a plurality of switching control parts for controlling the respective inverters. Each switching control unit outputs a switching request for switching the connection relationship between the inverter and the motor to another switching control unit, and controls the connection switching unit according to the response of the other switching control unit. It is characterized by doing.

According to a sixth aspect of the present invention, there is provided the motor driving apparatus according to the first aspect, wherein the switching control means is connected to a traveling distance detecting means for outputting traveling distance data of the vehicle, The connection switching means is controlled so as to switch the connection relationship between each of the motors and each of the inverters based on the cumulative travel distance obtained by integrating the travel distance data from the detection means.

According to a seventh aspect of the present invention, there is provided the motor drive apparatus according to the first aspect, wherein the switching control means and the motors are arranged so as to equalize the frequency of use of the power modules of the respective inverters. The connection switching means is controlled so as to switch the connection relationship with each inverter.

In order to solve the above-mentioned problems, in the motor drive device according to an eighth aspect of the present invention, the motor is connected to any one of the plurality of motors, and the power module is driven to supply power to the connected motor. A plurality of inverters for supplying electric power, and a power input connector for each motor that is detachable, and a power supply connector provided for each inverter for supplying electric power from each inverter to the power input connector, and each motor. And connection determination means for determining a connection relationship with each of the inverters, and connection control means for controlling electric power supplied to each motor according to the connection relationship between each of the motors and each of the inverters determined by the connection determination means. Motor drive control means for controlling the inverter,
The present invention is characterized by comprising switching notification means for notifying switching of the connection relationship between each of the motors and each of the inverters so as to equalize the life of each of the power modules forming each of the inverters.

According to a ninth aspect of the present invention, there is provided the motor driving apparatus according to the eighth aspect, wherein the switching notifying means is connected to a traveling distance detecting means for outputting traveling distance data of the vehicle. It is characterized by notifying that the connection relationship between each of the motors and each of the inverters will be switched based on the cumulative traveled distance obtained by integrating the traveled distance data from the detection means.

A motor drive device according to a tenth aspect of the present invention is the motor drive device according to the eighth aspect, wherein the switching notifying means and the motors are provided so as to level the frequency of use of the power module of each inverter. It is characterized by notifying that the connection relationship with each inverter will be switched.

[0017]

According to the motor drive device of the first aspect of the present invention, the connection relationship between each motor and each inverter is controlled so as to control the connection switching means so as to level the life of each power module constituting each inverter. Therefore, when driving a plurality of motors with a plurality of inverters, the life of each inverter can be effectively utilized.

According to the motor drive device of the second aspect,
When the temperature of the power module of each inverter is acquired and the acquired temperature is equal to or higher than a predetermined temperature, the motor connected to the inverter equipped with this power module is connected to another inverter. When the load is different and the temperature due to the calorific value of a certain power module exceeds a predetermined temperature due to high load use, the connection relationship between the motor and inverter can be switched, and other power modules can use high load. You can continue. Therefore, according to the motor drive device of the second aspect, it is possible to continuously perform high load use.

According to the motor drive device of claim 3,
The temperature difference of the power module of each inverter is calculated, and when the calculated temperature difference is equal to or greater than a predetermined temperature difference, the motor connected to the inverter equipped with this power module is connected to another inverter, The connection can be switched according to the temperature of the inverter, and the life of each power module can be leveled according to the amount of heat generation.

According to the motor drive device of the fourth aspect,
When the elapsed time from the previous switching time is a predetermined time or more, the motor connected to the inverter equipped with the power module having a predetermined temperature or higher can be connected to another inverter.

According to the motor drive device of the fifth aspect,
When switching the connection between the motor and the inverter,
Each switching control unit outputs a switching request for switching the connection relationship between the inverter and the motor to another switching control unit, and controls the connection switching unit according to the response of the other switching control unit. The connection relation can be automatically switched according to the control states of other inverters.

According to the motor drive device of the sixth aspect,
Since the connection relationship between each motor and each inverter is switched based on the cumulative mileage obtained by integrating the mileage data,
The usage frequency of each power module can be equalized.

According to the motor drive device of the seventh aspect,
Since the connection relationship between each motor and each inverter is switched so as to equalize the usage frequency of the power module of each inverter, even if the usage frequency of one power module becomes higher than the usage frequency of the other power module It is possible to connect a power module that has been connected to a motor having a high frequency to a motor that has a low frequency of use. Therefore, according to this motor drive device, it is possible to level the service life of each power module according to the frequency of use.

According to the motor drive device of claim 8,
When switching the connection between the power supply connector provided for each inverter and the power input connector of the motor, notification is given to level the life of each power module that composes each inverter. It can be used effectively.

According to the motor drive device of the ninth aspect,
Since switching of the connection relationship between each motor and each inverter is notified based on the cumulative traveling distance obtained by accumulating the traveling distance data, the frequency of use of each power module can be equalized.

According to the motor drive device of the tenth aspect, switching of the connection relation between each motor and each inverter is notified so as to level the usage frequency of the power module of each inverter, so that the usage frequency of each motor is increased. If one of the power modules is used more frequently than the other power module, the power module connected to the frequently used motor is connected to the less frequently used motor. be able to. Therefore, according to this motor drive device, it is possible to equalize the service life of each power module according to the frequency of use.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] The present invention is applied to, for example, a motor drive device according to a first embodiment configured as shown in FIGS. 1 and 2, and this motor drive device is mounted on an electric vehicle. It The motor drive device according to the first embodiment has an automatic switching function that switches the connection relationship between the first motor 1 and the second motor 2 and the first inverter circuit 22 and the second inverter circuit 23.

[Structure of Motor Drive Device According to First Embodiment] The motor drive device according to the first embodiment is connected to a battery or the like (not shown) to control the electric power supplied to the first motor 1 and the second motor 2. And a connection switching unit 4 that switches the connection relationship between the first motor 1 and the second motor 2 with respect to the inverter unit 3. Inverter part 3
Is connected to a mileage meter 5 which outputs mileage data. The inverter unit 3 and the connection switching unit 4 are
It is connected via the C terminal connector 6 and the second AC terminal connector 7. Further, the connection switching unit 4 and the first motor 1 are connected via the first motor AC terminal connector 8, and the connection switching unit 4 and the second motor 2 are connected via the second motor AC terminal connector 9. Connected.

The first motor 1 is used as a driving motor for generating the driving force of the electric vehicle, and the second motor 2 is used as a regenerative dedicated motor. Therefore, in this motor drive device, the first motor 1 and the second motor 2 have different usage frequencies.

The connection switching section 4 includes a first AC terminal connector 6
The motor drive signal is input from the inverter section 3 via the first switch circuit 11, the second switch circuit 12 and the third switch circuit 13 to which the motor drive signal is input via the inverter section 3, and the second AC terminal connector 7. Done 4th
A switch circuit 14, a fifth switch circuit 15, and a sixth switch circuit 16 are provided. Also, this connection switching unit 4
First switch circuit 11, second switch circuit 12 and third switch circuit
A first electromagnetic coil 17 that drives the switch circuit 13 and a second electromagnetic coil 18 that drives the fourth switch circuit 14, the fifth switch circuit 15, and the sixth switch circuit 16 are provided.

The first switch circuit 11, the second switch circuit 12, and the third switch circuit 13 are composed of the first motor 1 and the second switch circuit 13.
It is provided corresponding to the U phase, V phase, and W phase of the motor 2.
In addition, the fourth switch circuit 14, the fifth switch circuit 15,
The sixth switch circuit 16 is provided corresponding to the U phase, V phase, and W phase of the first motor 1 and the second motor 2.

The first switch circuit 11, the second switch circuit 12, and the third switch circuit 13 are connected to the terminal a connected to the inverter unit 3, the terminal b connected to the first motor 1, and the second motor 2. And a terminal c. In the first switch circuit 11, the second switch circuit 12, and the third switch circuit 13, the terminal a and the terminal b are connected when the first electromagnetic coil 17 is in the ON state, and
When the electromagnetic coil 17 is off, the terminal a and the terminal c are connected.

The fourth switch circuit 14, the fifth switch circuit 15 and the sixth switch circuit 16 are connected to the terminal a connected to the inverter unit 3, the terminal b connected to the second motor 2, and the first motor 1. And a terminal c. In the fourth switch circuit 14, the fifth switch circuit 15, and the sixth switch circuit 16, the terminal a and the terminal b are connected when the second electromagnetic coil 18 is in the ON state, and
When the electromagnetic coil 18 is off, the terminal a and the terminal c are connected.

The first electromagnetic coil 17 receives the coil drive signal from the inverter section 3, and receives the first switch circuit 11 and
The second switch circuit 12 and the third switch circuit 13 are driven. The second electromagnetic coil 18 inputs the coil drive signal from the inverter unit 3 and drives the fourth switch circuit 14, the fifth switch circuit 15, and the sixth switch circuit 16.

In the case shown in FIG. 1, the connection switching section 4 is in a state in which the terminals a and b of the first switch circuit 11 to the sixth switch circuit 16 are connected in accordance with the coil drive signal. In this state, the connection switching unit 4 connects the first switch circuit 11 to the third switch circuit 13 and the first motor 1, and the fourth switch circuit 14 to the sixth switch circuit 1
6 and the second motor 2 are connected. This makes the first
AC power from the first AC terminal connector 6 is supplied to the first motor 1 via the first motor AC terminal connector 8 by the switch circuits 11 to 3 and the fourth switch circuit 14 to the sixth switch circuit 16 are used. Second motor A
The AC power from the second AC terminal connector 7 is supplied to the second motor 2 via the C terminal connector 9.

On the other hand, in the case shown in FIG. 2, the connection switching section 4 has the first switch circuit 11 according to the coil drive signal.
The terminal a and the terminal c of the sixth switch circuit 16 are connected to each other. In this state, the connection switching unit 4
The switch circuits 11 to 13 are connected to the second motor 2, and the fourth switch circuit 14 to the sixth switch circuit 16 are connected to the first motor 1. This allows
AC power from the first AC terminal connector 6 is supplied to the second motor 2 via the second motor AC terminal connector 9 by the first switch circuit 11 to the third switch circuit 13, and the fourth switch circuit 14 to the sixth switch circuit. 16 through the first motor AC terminal connector 8 to the second AC terminal connector 7
AC power is supplied to the first motor 1.

The inverter unit 3 includes the motor controller 2
1, a first inverter circuit 22 and a second inverter circuit 23 controlled by the motor controller 21, and a relay drive circuit 24 that drives the first electromagnetic coil 17 and the second electromagnetic coil 18 of the connection switching unit 4. It is configured.

The first inverter circuit 22 includes a first drive circuit 31 connected to the motor controller 21 and a first drive circuit 31.
It is composed of a first power module 32 connected to the AC terminal connector 6 and a first temperature sensor 33 for detecting the temperature of the first power module 32.

A motor control signal is input from the motor controller 21 to the first drive circuit 31. The first drive circuit 31 generates a drive signal according to the motor control signal and outputs the drive signal to the first power module 32.

The first power module 32 comprises a plurality of semiconductor switching elements corresponding to the U phase, V phase, and W phase of the first motor 1 or the second motor 2. The first power module 32 turns on / off a plurality of semiconductor switching elements in accordance with a drive signal output from the first drive circuit 31, converts direct-current power from a battery (not shown) into alternating-current power, and first AC terminal connector 6 Supply to.

The first temperature sensor 33 is provided close to or built in the first power module 32. The first temperature sensor 33 detects a temperature at which heat is generated when a plurality of semiconductor switching elements included in the first power module 32 are driven on and off. The first temperature sensor 33 is
The temperature of the first power module 32 is detected, a sensor signal is generated and output to the motor controller 21.

The second inverter circuit 23 includes a second drive circuit 41 connected to the motor controller 21 and a second drive circuit 41.
It comprises a first power module 42 connected to the AC terminal connector 7 and a second temperature sensor 43 for detecting the temperature of the second power module 42.

A motor control signal is input to the second drive circuit 41 from the motor controller 21. The second drive circuit 41 generates a drive signal according to the motor control signal and outputs the drive signal to the second power module 42.

The second power module 42 comprises a plurality of semiconductor switching elements corresponding to the U phase, V phase and W phase of the first motor 1 or the second motor 2. The second power module 42 turns on and off a plurality of semiconductor switching elements according to a drive signal output from the second drive circuit 41 to convert direct current power from a battery (not shown) into alternating current power to output the second AC terminal connector 7 Supply to.

The second temperature sensor 43 is provided close to or built in the second power module 42. The second temperature sensor 43 detects a temperature at which heat is generated when a plurality of semiconductor switching elements included in the second power module 42 are driven on and off. The second temperature sensor 43 is
The temperature of the second power module 42 is detected, a sensor signal is generated and output to the motor controller 21.

The switching control signal from the motor controller 21 is input to the relay drive circuit 24, and the first electromagnetic coil 17 and the second electromagnetic coil 18 are supplied in accordance with the switching control signal.
A coil drive signal for driving the is generated and output. The relay drive circuit 24 switches ON / OFF of the current supplied to the first electromagnetic coil 17 and the second electromagnetic coil 18 according to the coil drive signal.

The motor controller 21 has a first inverter circuit 22 and a second inverter circuit 23.
The controller 51 and the second controller 52 are connected to the first controller 51 and the second controller 52, and the relay drive circuit 24 is connected.
And a logic circuit 53 connected to.
Further, the motor controller 21 is configured to monitor the switching control signal transmitted by the connection line between the logic circuit 53 and the relay drive circuit 24 by the first control unit 51 and the second control unit 52. Further, the motor controller 21 is configured to communicate between the first controller 51 and the second controller 52.

The logic circuit 53 includes a first control section 51 and a second control section.
A relay drive signal from the controller 52 is input. The logic circuit 53 uses the combination of the two input relay drive signals to connect the first switching circuit 11 to the third switching circuit 13 and the fourth switching circuit 14 to the sixth switching circuit 16 of the connection switching unit 4 to the first motor 1 to A switching control signal for switching the connection relationship with the second motor 2 is generated. Logic circuit 53
Outputs the generated switching control signal to the relay drive circuit 24.

Specifically, as shown in FIG. 3, the logic circuit 53 causes the electromagnetic coil on command relay drive signal represented by "1" or the electromagnetic coil off command relay drive signal represented by "0". Is entered.

The logic circuit 53 includes a first control section 51 and a second control section 51.
When the relay drive signals from the control unit 52 are both "1", the relay drive circuit 24 outputs a switching control signal for turning on both the first electromagnetic coil 17 and the second electromagnetic coil 18.
Output to. Here, the logic circuit 53 represents the value of the switching control signal for turning on both the first electromagnetic coil 17 and the second electromagnetic coil 18 by "1". As a result, the first electromagnetic coil 17 and the second electromagnetic switch 17 are arranged so that the first switch circuit 11 to the third switch circuit 13 and the fourth switch circuit 14 to the sixth switch circuit 16 are connected to terminals a and b.
The electromagnetic coil 18 is driven.

In the logic circuit 53, the relay drive signal from the first controller 51 is "1", and the second controller 52 is
The relay drive signal from the second controller 52 is “0”, and the relay drive signal from the second controller 52 is “0”.
When the relay drive signal from the control unit 52 is “1”, the same switching control signal as the previous value is output to the relay drive circuit 24.

Further, when both the relay drive signals from the first control section 51 and the second control section 52 are "0", the logic circuit 53 causes both the first electromagnetic coil 17 and the second electromagnetic coil 18 to operate. A switching control signal for turning off is output to the relay drive circuit 24. Here, the logic circuit 53 represents the value of the switching control signal for turning off both the first electromagnetic coil 17 and the second electromagnetic coil 18 by “0”. This allows
1st switch circuit 11-3rd switch circuit 13 and 4th
The first electromagnetic coil 17 is arranged so that the switch circuit 14 to the sixth switch circuit 16 are connected to the terminals a and c.
Also, the second electromagnetic coil 18 is driven.

The first control unit 51 and the second control unit 52 monitor the switching control signal output from the logic circuit 53 to the relay drive circuit 24, and the first inverter circuit 22, the second inverter circuit 23, and the first motor. Connection determination processing for determining the connection relationship with the first and second motors 2 is performed.

The first control section 51 determines the first inverter circuit 2 according to the connection determination result determined by the connection determination process.
The motor drive signal for controlling the motor connected to 2 is generated and output to the first inverter circuit 22. In addition, the second control unit 52 generates a motor drive signal for controlling the motor connected to the second inverter circuit 23 according to the result determined by the connection determination process,
Output to the inverter circuit 23.

The first control section 51 and the second control section 52 are provided with a motor drive command for driving the first motor 1 from the outside and a second control section.
A motor drive command for driving the motor 2 is input. First
The control unit 51 and the second control unit 52 are motors including motor control signals corresponding to U-phase, V-phase, and W-phase of the motors connected to the first inverter circuit 22 and the second inverter circuit 23 according to the motor drive command. Generate control data.
The first control unit 51 and the second control unit 52 generate a motor drive torque target value, a motor rotation speed target value, a motor rotation angle, and the like as motor control data. The first controller 51 outputs a motor control signal to the first inverter circuit 22,
The control unit 52 sends the motor control signal to the second inverter circuit 2
Output to 3.

Further, the first control section 51 and the second control section 52
Is the connection relationship determined by the connection determination process, sensor signals from the first temperature sensor 33 and the second temperature sensor 43,
Based on mileage data from the mileage meter 5,
A connection switching control process for controlling the connection switching unit 4 by determining the switching timing of the connection relationship between the first inverter circuit 22 and the second inverter circuit 23 and the first motor 1 and the second motor 2 is performed.

The first control unit 51 and the second control unit 52
The detailed processing contents of the connection determination processing and the connection switching control processing by will be described later.

[Operation of Motor Drive Device According to First Embodiment] The operation of the motor drive device according to the first embodiment configured as described above will be described below.

<Connection Determination Processing> FIG. 4 shows the processing procedure of the connection determination processing by the first control section 51, and FIG. 5 shows the processing procedure of the connection determination processing by the second control section 52. The 1st control part 51 and the 2nd control part 52 judge the connection relation for every predetermined period by performing the process shown in FIG. 4 and FIG. 5, for example for every predetermined period.

According to FIG. 4, first, in step S1, the first control section 51 monitors the switching control signal output from the logic circuit 53 to the relay drive circuit 24, and the value of the switching control signal is "1". It is determined whether or not The value of the switching control signal is "1", that is, the first electromagnetic coil 17 and the second electromagnetic coil 18 are both in the ON state, and the first switch circuit 11 to the sixth switch circuit 16 connect the terminal a and the terminal b. It is determined whether or not it is in the state. When the value of the switching control signal is "1", the process proceeds to step S2, and when the value of the switching control signal is "0", the process proceeds to step S3.

In step S2, the first controller 51
Determines that the first motor 1 is connected to the first AC terminal connector 6 according to the determination in step S1 and ends the process. In step S3, the first control unit 51
According to the determination in step S1, the first AC terminal connector 6
It is determined that the second motor 2 is connected to.

On the other hand, according to FIG. 5, first, step S1
1, the second control unit 52 monitors the switching control signal output from the logic circuit 53 to the relay drive circuit 24,
It is determined whether or not the value of the switching control signal is "1".
The value of the switching control signal is "1", that is, the first electromagnetic coil 1
7 and the second electromagnetic coil 18 are both in the ON state, and it is determined whether the first switch circuit 11 to the sixth switch circuit 16 are in the state where the terminals a and b are connected. When the value of the switching control signal is "1", the processing is performed in step S
If the value of the switching control signal is "0", the process proceeds to step S13.

In step S12, the second controller 52
Determines that the second motor 2 is connected to the second AC terminal connector 7 according to the determination in step S11 and ends the process. On the other hand, in step S13, the second control unit 52 determines that the first motor 1 is connected to the second AC terminal connector 7 according to the determination in step S11.

<Motor Drive Processing> FIG. 6 shows the first control section 51.
The processing procedure of the motor drive processing via the first inverter circuit 22 is shown, and the processing procedure of the motor drive processing via the second inverter circuit 23 by the second controller 52 is shown in FIG. The first control unit 51 and the second control unit 52 perform the motor drive process according to the connection determination process by performing the process shown in FIGS. 6 and 7 at predetermined intervals, for example.

According to FIG. 6, first, in step S21, after the connection determination process for the first AC terminal connector 6 shown in FIG. 4 is performed, when the first motor 1 or the second motor 2 is driven, The process proceeds to step S22.
In step S22, the first control unit 51 refers to the connection determination result in step S21 and determines whether the first motor 1 is connected to the first AC terminal connector 6.

When it is determined that the first motor 1 is connected to the first AC terminal connector 6, the process proceeds to step S23. In step S23, the first control unit 5
1 performs motor control processing of generating motor control data according to a motor drive command for driving the first motor 1 and outputting a motor drive signal corresponding to each phase to the first drive circuit 31. As a result, the first control unit 51 performs motor drive processing for driving the first motor 1.

If it is determined in step S22 that the second motor 2 is connected to the first AC terminal connector 6, the process proceeds to step S24. Step S
At 24, the first control unit 51 generates motor control data according to a motor drive command for driving the second motor 2, and outputs a motor drive signal corresponding to each phase to the first drive circuit 3
The motor control processing for outputting 1 is performed. This makes the first
The control unit 51 performs motor drive processing for driving the second motor 2.

According to FIG. 7, first, in step S31, after the connection determination process for the second AC terminal connector 7 shown in FIG. 5 is performed, when the first motor 1 or the second motor 2 is driven, The process proceeds to step S32.
In step S32, the second control unit 52 refers to the connection determination result in step S31 and determines whether or not the first motor 1 is connected to the second AC terminal connector 7.

When it is determined that the first motor 1 is connected to the second AC terminal connector 7, the process proceeds to step S33. In step S33, the second control unit 5
A motor control process 2 generates motor control data according to a motor drive command for driving the first motor 1 and outputs a motor drive signal corresponding to each phase to the second drive circuit 41. As a result, the second controller 52 performs motor drive processing for driving the first motor 1.

If it is determined in step S32 that the second motor 2 is connected to the second AC terminal connector 7, the process proceeds to step S34. Step S
At 34, the second controller 52 generates motor control data in accordance with a motor drive command for driving the second motor 2 and outputs a motor drive signal corresponding to each phase to the second drive circuit 4
The motor control processing for outputting 1 is performed. This allows the second
The control unit 52 performs motor drive processing for driving the second motor 2.

<Connection Switching Control Processing> FIG. 8 shows the first control unit 5
1 shows the processing procedure of the connection switching control processing, and FIG. 9 shows the processing procedure of the connection switching control processing by the second controller 52. The first control unit 51 and the second control unit 52 independently perform the processing illustrated in FIGS. 8 and 9, for example, every predetermined period.

In the example shown in FIGS. 8 and 9, the first
By the control unit 51, the first inverter circuit 22
While controlling the motor 1, the second control unit 52 controls the second
The connection relationship is changed from a state in which the second motor 2 is controlled via the inverter circuit 23 to a state in which the first motor 51 is controlled by the first controller 51 and the first motor 1 is controlled by the second controller 52. An example of switching will be described.

According to FIG. 8, first, in step S41, the first control section 51 inputs the sensor signal from the first temperature sensor 33, and the temperature value of the first power module 32 indicated by the sensor signal and It is determined whether or not the temperature value of the first power module 32 is equal to or higher than the first temperature threshold value by comparing with the set first temperature threshold value.

The temperature value of the first power module 32 is the first
If it is determined that the temperature is equal to or higher than the temperature threshold value, the process proceeds to step S.
Proceed to 42. On the other hand, when it is determined that the temperature value of the first power module 32 is not equal to or higher than the first temperature threshold value, this determination is repeated after a predetermined time, for example. The first temperature threshold value is a value for determining that the heat generation amount of the first power module 32 has become equal to or greater than a predetermined value, and is set in advance and held in the first control unit 51.

In step S42, the first controller 51
Inputs the temperature value of the second power module 42 detected by the second temperature sensor 43 and subtracts the temperature value of the second power module 42 from the temperature value of the first power module 32 detected in step S41 to obtain the temperature. Calculate the difference. First
The control unit 51 compares the calculated temperature difference with a preset first temperature difference threshold value, and determines whether the calculated temperature difference is equal to or more than the first temperature difference threshold value. . When it is determined that the calculated temperature difference is equal to or larger than the first temperature difference threshold value, the process proceeds to step S43. On the other hand, if it is determined that the calculated temperature difference is not greater than or equal to the first temperature difference threshold value, the process returns to step S41. This first temperature difference threshold is, for example, the first motor 1 and the second motor 2 and the first
It is a value that determines that it is desirable to switch the connection relationship between the inverter circuit 22 and the second inverter circuit 23, and is set in advance and held in the first control unit 51.

In step S43, the first controller 51
Compares the elapsed time from the switching timing at which the connection relationship was switched last time with a preset time threshold value, and when it is determined that the elapsed time is equal to or longer than the time threshold value, proceeds to step S44. Proceed with processing. On the other hand, if it is determined that the elapsed time is not equal to or longer than the time threshold value, the process is returned to step S41. This time threshold value is, for example, the first motor 1 and the second motor 2 and the first inverter circuit 22.
And a value for determining that it is desirable to switch the connection relationship with the second inverter circuit 23, which is set in advance and held in the first control unit 51.

In step S44, the first controller 51
In response to determining all the determinations from step S41 to step S43 as “yes”, the second control unit 52 is notified of a motor switching request for switching the connection relationship, and the process is performed in step S45. Proceed.

In step S45, the first controller 51
Determines whether or not the answer of the second control unit 52 corresponding to the notification of the motor switching request is input in Step S44, and when the answer from the second control unit 52 is input, Step S44
The process proceeds to 46.

In step S46, the first controller 51
When it is determined that the answer input from the second control unit 52 in step S45 is an answer indicating that the motor can be switched, the process proceeds to step S47. When it is determined that the answer input in step S45 is an answer indicating that the motor cannot be switched, the process is returned to step S41.

In step S47, the first controller 51
Outputs to the second control unit 52 the motor control data for the motor currently being controlled and at the same time outputs the motor control data for the motor currently being controlled by the second control unit 52 to the second control unit. By inputting from 52, motor control data is exchanged and the process proceeds to step S48.

In step S48, the first controller 51
If it is determined that the exchange of the motor control data in step S47 is completed, the process proceeds to step S49.

In step S49, the first controller 51
Outputs a relay drive signal to the logic circuit 53 and ends the process.

According to the first control section 51 which performs such processing, the heat generation amount of the first power module 32 (step S
41), the temperature difference between the temperature of the first inverter circuit 22 and the second inverter circuit 23 (step S42), the elapsed time from the previous switching timing (step S43),
According to the determination of the motor control status (step S46) of the second controller 52, the first motor 1 and the second motor 2, and the first motor 1
The switching timing for switching the connection relationship between the inverter circuit 22 and the second inverter circuit 23 can be determined.

On the other hand, according to FIG. 9, first, step S5
1, the second controller 52 inputs the sensor signal from the second temperature sensor 43, determines whether the temperature value of the second power module 42 is equal to or higher than the second temperature threshold value, and determines the temperature. If it is determined that the value is equal to or higher than the second temperature threshold value, the process proceeds to step S52. The second temperature threshold value is a value for determining that the heat generation amount of the second power module 42 has become equal to or greater than a predetermined value, and is preset and held in the second control unit 52.

In step S52, the second controller 52
Inputs the temperature value of the first power module 32 detected by the first temperature sensor 33, subtracts the temperature value of the first power module 32 from the temperature value of the second power module 42 detected in step S51, and Calculate the difference. Second
The controller 52 determines whether the calculated temperature difference is equal to or larger than the second temperature difference threshold value. If it is determined that the calculated temperature difference is greater than or equal to the second temperature difference threshold value, the process proceeds to step S53, and if it is determined that the calculated temperature difference is not greater than or equal to the first temperature difference threshold value, the process proceeds to step S51.
Return to. The second temperature difference threshold value is a value that is determined to be desirable to switch the connection relationship between the first motor 1 and the second motor 2 with respect to the second AC terminal connector 7, for example, and is set in advance in the second control unit 52. Held in.

In step S53, the second controller 5
2. The elapsed time from the switching timing at which the connection relation was switched the previous time is compared with a preset time threshold value, and when it is determined that the elapsed time is equal to or longer than the time threshold value, the process proceeds to step S54. Proceed with processing. On the other hand, if it is determined that the elapsed time is not equal to or longer than the time threshold value, the process is returned to step S51. This time threshold is a value for determining that it is desirable to switch the connection relationship between the first motor 1 and the second motor 2 with respect to the second AC terminal connector 7, for example, and is set in advance and held in the second control unit 52. Has been done.

In step S54, the second controller 52
Responds to all the determinations from step S51 to step S53 with "yes", notifies the first control unit 51 of a motor switching request for switching the connection relationship, and the process proceeds to step S55. Proceed.

In step S55, the second controller 52
Determines whether or not the response of the first control unit 51 corresponding to the notification of the motor switching request is input in Step S54, and when the response from the first control unit 51 is input, Step S54
The process proceeds to 56.

In step S56, the second controller 52
When it is determined that the answer input from the first control unit 51 in step S55 is an answer indicating that the motor can be switched, the process proceeds to step S57. When it is determined that the answer input in step S55 is an answer indicating that the motor cannot be switched, the process is returned to step S51.

In step S57, the second controller 52
Outputs the motor control data for the motor currently being controlled to the first controller 51, and at the same time outputs the motor control data for the motor currently being controlled by the first controller 51 to the first controller 51. By inputting from 51, motor control data is exchanged and the process proceeds to step S58.

In step S58, the second controller 52
If it is determined that the exchange of the motor control data in step S57 is completed, the process proceeds to step S59.

In step S59, the second controller 52
Outputs a relay drive signal to the logic circuit 53 and ends the process.

According to the second control section 52 which performs such processing, the heat generation amount of the second power module 42 (step S
51), the temperature difference between the second inverter circuit 23 and the first inverter circuit 22 (step S52), the time elapsed from the previous switching timing (step S53), and the motor control status of the first controller 51 (step S56). According to the determination, the switching timing for switching the connection relationship between the first motor 1 and the second motor 2 and the first inverter circuit 22 and the second inverter circuit 23 can be determined.

"Effects of Motor Drive Device According to First Embodiment" As described above in detail, according to the motor drive device according to the first embodiment, the first motor 1 and the second motor 2 The connection relationship between the power module 32 and the second power module 42 can be switched so as to equalize the life of the first power module 32 and the life of the second power module 42, and a plurality of motors can be driven by a plurality of inverters. When driving, the life of each inverter can be effectively utilized.

According to this motor drive device, the first
Load of power module 32 and second power module 4
When the load value of 2 is different and the temperature value due to the heat generation amount of one power module exceeds the temperature threshold value due to high load use, the connection relationship between the motor and the inverter can be switched, and the other power module can be switched. The module allows high load usage to continue. Therefore, according to this motor drive device, even with the same configuration as the conventional power module, it is possible to continuously use a high load than a single power module.

Further, according to this motor drive device, when the temperature difference between the power modules of the respective inverters is equal to or higher than the temperature difference threshold value, the motor drive device is connected to the inverter equipped with the power module having a temperature value equal to or higher than the temperature threshold value. The motor
The connection can be switched to another inverter, and the life of each power module can be leveled according to the amount of heat generation.

Further, according to this motor drive device, when the time elapsed from the switching timing when the connection relationship between each motor and each inverter is switched is equal to or longer than the time threshold value, the temperature value equal to or higher than the temperature threshold value is set. The motor connected to the inverter equipped with the power module can be switched to another inverter.

Furthermore, according to this motor drive device,
First motor 1 and second motor 2 and first inverter circuit 2
When switching the connection relationship between the second inverter circuit 23 and the second inverter circuit 23, communication is performed between the first control unit 51 and the second control unit 52, so that the connection relationship is automatically switched according to the control states of other inverters. Can be done on a regular basis.

Further, the first control unit 51 and the second control unit 52
Is the first motor 1 according to the heat generation amount of the first power module 32 and the second power module 42, the temperature difference, the elapsed time from the previous switching timing, and the determination of the motor control status.
And the second motor 2, the first inverter circuit 22 and the second
The case where the connection relationship with the inverter circuit 23 is switched has been described, but the present invention is not limited to this.

That is, the first control section 51 and the second control section 52 are arranged so that the frequency of use of the first power module 32 and the second
The use frequency of the power module 42 may be calculated to switch the connection relationship.

At this time, the first control section 51 and the second control section 52 determine the applied voltage of the first power module 32 and the second power module 42 and the energization current of the first power module 32 and the second power module 42. , And time are used to calculate the integrated value as the usage frequency. In addition, the first control unit 51 and the second control unit 52, the applied voltage of the first power module 32 and the second power module 42,
First power module 32 and second power module 4
The usage frequency may be an integrated value obtained by multiplying the number of times the energized current of 2 exceeds a predetermined value. Furthermore, the first control unit 51
The second controller 52 may use the integrated value of the number of times that the rate of change of the energization current of the first power module 32 and the second power module 42 per predetermined time exceeds the predetermined value as the usage frequency.

The first control section 51 and the second control section 52 determine whether any one of the usage frequencies exceeds a predetermined value,
When the usage frequency exceeds a predetermined value, the connection switching unit 4 is controlled to switch the connection relationship. Then, when the switching of the connection relationship is completed, the first control unit 51 and the second control unit 52 reset the accumulated usage frequency.

As a result, the first motor 1 and the second motor 2
When the frequency of use is different between and, even if the frequency of use of one power module is higher than the frequency of use of the other power module, the power module connected to the frequently used motor is used less frequently. Can be connected to a motor. Therefore, according to this motor drive device, it is possible to level the service life of each power module according to the frequency of use.

Further, the first control section 51 and the second control section 52
May be switched so as to equalize the service life of the first power module 32 and the service life of the second power module 42 based on the travel distance meter from the travel distance meter 5.

At this time, the first control unit 51 and the second control unit 52 monitor the traveling distance data and determine whether or not the accumulated traveling distance from the previous connection-related switching timing exceeds the predetermined traveling distance. To do. This predetermined mileage is the first
A desired value for switching the connection relationship is set depending on the purpose of use of the motor 1 and the second motor 2. The first control unit 51 and the second control unit 52 control the connection switching unit 4 to switch the connection relationship as described above when the cumulative traveling distance becomes equal to or greater than the predetermined traveling distance. Then, the first control unit 51 and the second control unit 52 reset the cumulative traveling distance when the switching of the connection relationship is completed.

As a result, even when the first motor 1 and the second motor 2 have different usage frequencies and the like depending on the traveling distance, the usage frequency of the first power module 32 and the second power module 32 are different.
The frequency of use of the power module 42 can be equalized. Therefore, according to this motor drive device, even if the life of each power module differs depending on the traveling distance, the life of each power module can be leveled.

In the present embodiment, the first temperature sensor 3
Although an example of detecting the temperatures of the first power module 32 and the second power module 42 using the third and second temperature sensors 43 has been described, the present invention is not limited to this. That is, it is obtained by multiplying the current value supplied to the first power module 32 and the second power module 42 by the heat generation coefficient depending on the power module forming the first power module 32 and the second power module 42. You may use the estimated temperature value of the power module which integrated the value with respect to time. At this time, the first controller 51 and the second controller 52 calculate the estimated temperature values of the first power module 32 and the second temperature sensor 43.

[Second Embodiment] The present invention will be described with reference to FIG.
Also, the present invention is applied to the motor drive device according to the second embodiment configured as shown in FIG. In the following explanation,
The same parts as those of the motor drive device according to the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

The motor drive device according to the second embodiment determines the switching timing of the connection relationship between the first motor 1 and the second motor 2 and the first inverter circuit 22 and the second inverter circuit 23, and the user It differs from the motor drive device according to the first embodiment in that it has a manual switching structure that promotes switching of the connection relationship.

[Structure of Motor Driving Device According to Second Embodiment] FIG. 10 shows that the first inverter circuit 22 and the first motor 1 are connected, and the second inverter circuit 23 and the second motor 2 are connected. FIG. 11 shows a state in which the first inverter circuit 22 and the second motor 2 are connected and the second inverter circuit 23 and the first motor 1 are connected.

The motor drive device according to the second embodiment includes a first AC terminal connector 61 connected to the first power module 32 and a second AC terminal connector 63 connected to the second power module 42. The first AC terminal connector 61 and the second AC terminal connector 63 are the first
First motor AC terminal connector 62 connected to the motor 1
Alternatively, the second motor AC terminal connector 64 connected to the second motor 2 is manually attached / detached.

The first AC terminal connector 61 and the second AC terminal connector 63 are connected to the first motor AC terminal connector 62 or the second motor AC terminal connector 64 from the first inverter circuit 22 or the second inverter circuit 23. The electric power supply line for supplying the electric power of 1 to the first motor 1 or the second motor 2 is internally provided.

The first motor AC terminal connector 62 has a closed loop structure which is closed when the signal transmission line 62a is connected to the first AC terminal connector 61 or the second AC terminal connector 63 inside. First motor AC
The terminal connector 62 is the first AC terminal connector 61 or the second AC terminal connector 63 when the first AC terminal connector 61 or the second AC terminal connector 63 is connected.
To form an electrical closed loop.

The inside of the second motor AC terminal connector 64 has an open loop structure. Second motor A
The C terminal connector 64, in the state where the first AC terminal connector 61 or the second AC terminal connector 63 is connected,
First AC terminal connector 61 or second AC terminal connector 6
An electrical open loop is formed with the 3rd.

To the first AC terminal connector 61, a first connection determination circuit 71 for determining the connected motor AC terminal connector is connected. First connection determination circuit 7
1 includes a PNP transistor 72 connected to the first controller 51 and a ground terminal 73 connected to the first AC terminal connector 61.

As shown in FIG. 10, when the first AC terminal connector 61 and the first motor AC terminal connector 62 are connected, the PNP transistor 72, the first AC terminal connector 61, the first motor AC terminal connector 62, and the ground terminal. 73 and 73 form a closed loop. As a result, the GND potential is input to the base terminal of the PNP transistor 72, and the first connection determination circuit 71 becomes H (High).
The level signal is supplied to the first controller 51 as a connection determination signal.

On the other hand, as shown in FIG. 11, when the first AC terminal connector 61 and the second motor AC terminal connector 64 are connected, the second motor AC terminal connector 6
4 forms an open loop. This allows PN
The H level potential is input to the base terminal of the P transistor 72, and the first connection determination circuit 71 supplies the L (Low) level signal to the first control unit 51 as a connection determination signal.

A second connection determination circuit 81 for determining the connected motor AC terminal connector is connected to the first motor AC terminal connector 62. The second connection determination circuit 81 includes a PNP transistor 82 connected to the second controller 52, and a ground terminal 83 connected to the second AC terminal connector 63.

As shown in FIG. 11, with the second AC terminal connector 63 and the first motor AC terminal connector 62 connected, the PNP transistor 82, the second AC terminal connector 63, the first motor AC terminal connector 62, and the ground terminal. 83 and 83 form a closed loop. As a result, the GND potential is input to the base terminal of the PNP transistor 82, and the second connection determination circuit 81 becomes H (High).
The level signal is supplied to the second controller 52 as a connection determination signal.

On the other hand, as shown in FIG. 10, when the second AC terminal connector 63 and the second motor AC terminal connector 64 are connected, the second motor AC terminal connector 6
4 forms an open loop. This allows PN
The H potential is input to the base terminal of the P transistor 82,
The second connection determination circuit 81 supplies the L (Low) level signal to the second controller 52 as a connection determination signal.

Furthermore, the motor drive device is a presentation drive connected to the first inverter circuit 22 and the second inverter circuit 23, and the logic circuit 53 which outputs the switching control signal for the first motor 1 and the second motor 2. A circuit 91 is provided. The presentation drive circuit 91 outputs to the presentation device 92 an indicator / speaker drive signal that prompts switching of the connection relationship according to the switching control signal.

The presentation device 92 comprises, for example, a display mechanism such as an indicator mounted in the vehicle and a sound emitting mechanism such as a speaker. The presentation device 92 inputs the indicator / speaker drive signal from the presentation drive circuit 91, and notifies the user to prompt the user to switch the connection relationship by the indicator in the meter or the speaker installed in the vehicle compartment.

In such a motor drive device, the logic circuit 53 inputs the relay drive signal from the first control section 51 and the second control section 52. The logic circuit 53 generates a switching control signal in order to prompt switching of the connection relationship by the combination of the two input relay drive signals.

Specifically, as shown in FIG. 12, the logic circuit 53 establishes a connection relationship when the relay drive signals from the first control section 51 and the second control section 52 are both "1". A switching control signal for notifying switching is generated. As a result, the presentation device 92 notifies the timing of switching the connection relationship.

Further, the second control section 52 is the same as the first control section 51.
And the relay drive signals from the second controller 52 are both "1".
In other cases, the switching control signal for notifying that the connection relationship is switched is not generated.

The first control section 51 and the second control section 52 are connected to the first inverter circuit 22 and the second inverter circuit 23 based on the connection determination signals from the first connection determination circuit 71 and the second connection determination circuit 81. First motor 1 and second motor 2
Performs connection determination processing for determining the connection relationship with.

Then, in the first control section 51 and the second control section 52, the motor drive processing as shown in the first embodiment and the processing for calculating the switching timing of the connection relation based on the determination result of the connection determination processing. And so on.

[Operation of Motor Driving Device According to Second Embodiment] <Connection Judgment Processing> FIG. 13 shows the procedure of the connection judgment processing by the first controller 51, and FIG. 14 shows the connection judgment by the second controller 52. The processing procedure of processing is shown. The 1st control part 51 and the 2nd control part 52 judge the connection relation for every predetermined period by performing the process shown in FIGS. 13 and 14 for every predetermined period, for example.

According to FIG. 13, first, in step S61, the first control section 51 connects the connection determination signal from the first connection determination circuit 71 to the first motor AC terminal connector 62 to the first AC terminal connector 61. It is determined whether or not the signal is an L level signal due to the fact that the signal has been received. That is, in this step S61, it is determined whether or not the first inverter circuit 22 and the first motor 1 are connected. Connection judgment signal is L
When it is determined that the signal is a level signal, the processing is performed in step S
If it is determined that the signal is not the L level signal, the process proceeds to step S63.

In step S62, the first controller 51
Determines that the first motor 1 is connected to the first AC terminal connector 61 according to the determination in step S61 and ends the process. In step S63, the first control unit 5
1 determines that the second motor 2 is connected to the first AC terminal connector 61 according to the determination in step S61.

On the other hand, according to FIG. 13, first, in step S
In 71, the second control unit 52 causes the second connection determination circuit 8
It is determined whether or not the connection determination signal from 1 is the L signal due to the connection of the first motor AC terminal connector 62 to the second AC terminal connector 63. That is, in this step S71, it is determined whether or not the second inverter circuit 23 and the first motor 1 are connected. Connection judgment signal is L
When it is determined that the signal is a signal, the process proceeds to step S72, and when it is determined that the signal is not an L signal, step S73.
Proceed to.

In step S72, the second controller 52
Determines that the first motor 1 is connected to the second AC terminal connector 63 according to the determination in step S71, and ends the process. In step S73, the second control unit 5
No. 2 determines that the second motor 2 is connected to the second AC terminal connector 63 according to the determination in step S71.

According to the motor drive device of the second embodiment, as in the first embodiment, the first motor 1 and the second motor 2 are selected based on the traveling distance data, the frequency of use, the temperature, and the like. The connection relationship between the first power module 32 and the second power module 42 will be described with reference to the first power module 3
The switching is notified so as to equalize the life of 2 and the life of the second power module 42.

[Effects of Motor Drive Device According to Second Embodiment] As described above in detail, according to the motor drive device according to the second embodiment, the first AC terminal connector 61 and the second AC terminal connector 63 are provided. The connection relationship between the first motor AC terminal connector 62 or the second motor AC terminal connector 64 is switched so that the connection relationship between each motor and each inverter is switched so that the life of each power module forming each inverter is leveled. Since this is notified, the life of each inverter can be effectively used.

The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and other than this embodiment, as long as it does not deviate from the technical idea of the present invention, various types according to the design etc. Of course, it is possible to change.

That is, in the above-described embodiment, an example in which the two motors of the first motor 1 and the second motor 2 are driven by the two first inverter circuits 22 and the second inverter circuit 23 has been described, but the present invention is not limited to this. Alternatively, the present invention can be applied even when three or more motors are driven by an inverter corresponding to each motor.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example according to a first embodiment to which the present invention is applied.

FIG. 2 is a block diagram showing another configuration example according to the first embodiment to which the present invention is applied.

FIG. 3 is a diagram for explaining a switching control signal of a logic circuit according to a relay drive signal and a connection relationship between an inverter circuit and a motor in the motor drive device according to the first embodiment to which the present invention is applied.

FIG. 4 is a flowchart showing a processing procedure of connection determination processing by the first control unit in the motor drive device according to the first embodiment to which the present invention is applied.

FIG. 5 is a flowchart showing a processing procedure of connection determination processing by a second control unit in the motor drive device according to the first embodiment to which the present invention is applied.

FIG. 6 is a flowchart showing a processing procedure of a motor drive processing by the first control unit in the motor drive device according to the first embodiment to which the present invention is applied.

FIG. 7 is a flowchart showing a processing procedure of a motor drive processing by a second control unit in the motor drive device according to the first embodiment to which the present invention is applied.

FIG. 8 is a flowchart showing a processing procedure of connection switching control processing by the first control unit in the motor drive device according to the first embodiment to which the present invention is applied.

FIG. 9 is a flowchart showing a processing procedure of connection switching control processing by a second control unit in the motor drive device according to the first embodiment to which the present invention is applied.

FIG. 10 is a block diagram showing a configuration example according to a second embodiment to which the present invention is applied.

FIG. 11 is a block diagram showing another configuration example according to the second embodiment to which the present invention is applied.

FIG. 12 is a diagram for explaining a relationship between a switching control signal of a logic circuit according to a relay drive signal and a notification form in a motor drive device according to a second embodiment of the present invention.

FIG. 13 is a flowchart showing a processing procedure of connection determination processing by the first control unit in the motor drive device according to the second embodiment of the present invention.

FIG. 14 is a flowchart showing a processing procedure of connection determination processing by a second control unit in the motor drive device according to the second embodiment to which the present invention is applied.

[Explanation of symbols]

1st motor 2 second motor 3 Inverter section 4 Connection switching section 5 mileage meters 6 1st AC terminal connector 7 Second AC terminal connector 8 1st motor AC terminal connector 9 Second motor AC terminal connector 11 First switch circuit 12 Second switch circuit 13 Third switch circuit 14 Fourth switch circuit 15 Fifth switch circuit 16 Sixth switch circuit 17 First electromagnetic coil 18 Second electromagnetic coil 21 Motor controller 22 First Inverter Circuit 23 Second Inverter Circuit 24 Relay drive circuit 31 first drive circuit 32 First Power Module 33 First temperature sensor 41 Second drive circuit 42 Second power module 43 Second temperature sensor 51 First Control Unit 52 Second control unit 53 Logic circuit 61 1st AC terminal connector 62 1st motor AC terminal connector 63 Second AC terminal connector 64 Second motor AC terminal connector 71 First Connection Determination Circuit 72 PNP transistor 73 Ground terminal 81 Second connection determination circuit 82 PNP transistor 83 Ground terminal 91 Presentation drive circuit 92 presentation device

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 3D035 AA00                 5H007 AA06 BB06 CC05 CC09 DB01                       DC01                 5H115 PA15 PG04 PU08 PU24 PV09                       RB11 RB21 SE04 TO05 TU11                 5H572 AA02 BB07 DD02 EE04 HA04                       HB07 HC08 LL34 MM06 MM09                       MM12

Claims (10)

[Claims] 1. A plurality of inverters connected to any one of a plurality of motors to drive a power module to supply electric power to the connected motors, the motors, and the inverters. Connection determining means for determining the connection relationship between the motors and the motor drive for controlling each inverter so as to control the electric power supplied to each motor according to the connection relationship between each motor and each inverter determined by the connection determining means. A control means, a connection switching means for switching the connection relationship between the plurality of motors, and the plurality of inverters, and a control of the connection switching means so as to equalize the service life of each power module forming each inverter. And a switching control means for switching the connection relationship between the motors and the inverters. . 2. The switching control means obtains the temperature of the power module of each of the inverters, and when the obtained temperature is equal to or higher than a predetermined temperature, changes the motor connected to the inverter provided with the power module to another. The motor drive device according to claim 1, wherein the connection switching means is controlled so as to be connected to the inverter. 3. The switching control means calculates a temperature difference between the power modules of the inverters, and when the calculated temperature difference is equal to or more than a predetermined temperature difference, a motor connected to the inverter including the power module. 3. The motor drive device according to claim 2, wherein the connection switching means is controlled so as to be connected to another inverter. 4. The inverter provided with a power module having a temperature equal to or higher than a predetermined temperature when a time elapsed from a switching time point at which the connection relationship between the motors and the inverters is switched is a predetermined time or more. The motor drive device according to claim 3, wherein the connection switching means is controlled so that the motor connected to the inverter is connected to another inverter. 5. The switching control means comprises a plurality of switching control units for controlling each inverter, and each switching control unit issues a switching request for switching the connection relationship between the inverter and the motor. 2. The connection switching means is controlled according to the response of the other switching control section.
5. The motor drive device according to any one of 4 to 4. 6. The switching control means is connected to mileage detecting means for outputting mileage data of the vehicle, and each of the motors is based on an accumulated mileage obtained by integrating mileage data from the mileage detecting means. The motor drive device according to claim 1, wherein the connection switching means is controlled so as to switch the connection relationship between the inverter and each of the inverters. 7. The switching control means controls the connection switching means so as to switch the connection relationship between the motors and the inverters so as to level the frequency of use of the power module of each inverter. The motor drive device according to claim 1. 8. A plurality of inverters, which are connected to any one of a plurality of motors and drive a power module to supply electric power to the connected motors, and a power input connector of each motor, which is detachable. And a power supply connector provided for each of the inverters that supplies power from the inverters to the power input connector, connection determination means for determining a connection relationship between the motors, and the inverters, Motor drive control means for controlling each inverter so as to control the electric power supplied to each motor according to the connection relationship between each motor and each inverter determined by the connection determining means, and Switching the connection relationship between each motor and each inverter so that the life of the power module is leveled. Motor drive device, characterized in that it comprises a switching notification unit for notifying. 9. The switching notifying means is connected to a traveling distance detecting means for outputting traveling distance data of the vehicle, and each of the motors is based on an accumulated traveling distance obtained by accumulating traveling distance data from the traveling distance detecting means. 9. The motor drive device according to claim 8, further comprising notifying that the connection relationship between the inverter and each of the inverters will be switched. 10. The switching notifying means notifies that the connection relationship between each motor and each inverter is switched so as to level the frequency of use of the power module of each inverter. The motor drive device described in 1.