JP2019092238A - Motor controller - Google Patents

Abstract

To provide a motor controller capable of sooner notifying a user of an abnormality of a reflux circuit of a motor.SOLUTION: A motor controller 10 comprises a FET 26 for PWM for controlling electric current values supplied to a motor 5 from a power source 21, a reflux circuit 30 provided for refluxing a current supplied from the motor 5 while the FET 26 for PWM interrupts supply of current to the motor 5 from the power supply 21, a voltage measurement part 11 measuring a voltage of an element constituting the reflux circuit 30, and an abnormality notification processing part 12 performing an abnormality notification processing for notifying of an abnormality of the reflux circuit 30. The abnormality notification processing part 12 determines whether or not to perform the abnormality notification processing based on the voltage measured by the voltage measurement part 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor control device, and more particularly to a motor control device provided with a return circuit for returning current flowing from the motor.

  In a motor control device for controlling a motor, one is known which controls on / off of connection between a power supply and a motor by switching elements (PWM control) to control the output of the motor (see, for example, Patent Document 1) ).

Further, the motor control device described in Patent Document 1 is provided with a return circuit for returning the current flowing from the motor when the current supply to the motor is turned off.
In the motor control device described in Patent Document 1, a body diode of a field effect transistor (FET) is used as the free wheeling diode.

JP, 2013-219980, A

However, in the motor control device described above, if a contact failure occurs in the source terminal due to, for example, a solder failure or mounting failure of the FET, current can not flow through the body diode, and the gate voltage of the FET increases. Sometimes.
For example, if the gate voltage of the FET becomes higher than the battery voltage for driving the motor, the power supply to the motor may be interrupted and the motor may not operate normally. In addition, if a voltage higher than the withstand voltage is applied to the gate terminal of the FET, the FET may possibly be short-circuited.
Therefore, it is an issue to find a defect in the motor's return circuit early.

  The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a motor control device capable of early notifying a user of an abnormality in a motor return circuit.

According to the motor control device according to the present invention, the above-mentioned problem is a motor control device for controlling a motor, and a switching element for adjusting the amount of current supplied from the power source to the motor, and the power source by the switching element A return circuit provided to return the current flowing from the motor while the supply of the current from the motor to the motor is interrupted, and a voltage measurement unit measuring a voltage of an element constituting the return circuit; And an abnormality notification processing unit that executes abnormality notification processing for notifying the abnormality of the circulation circuit, wherein the abnormality notification processing unit performs the abnormality notification processing based on the voltage measured by the voltage measurement unit. Is solved by deciding whether to perform or not.
According to the above-described motor control device, it is possible to detect an abnormality of the reflux circuit by the voltage measured from the reflux circuit of the motor and to notify the user of the occurrence of the abnormality. Thus, it is possible to early notify the user of a motor return circuit abnormality.

In the above motor control device, the abnormality notification processing unit may execute the abnormality notification process when the voltage measured by the voltage measurement unit exceeds a threshold.
If a high voltage is applied to the elements constituting the motor's return circuit, the return may not be performed properly. Therefore, when a high voltage is applied to the elements of the reflux circuit, the motor control device can determine that there is an abnormality in the reflux circuit and can notify the user of that.

In the above motor control device, the reflux circuit includes a field effect transistor, a body diode of the field effect transistor is a reflux diode of the reflux circuit, and the voltage measurement unit determines a gate voltage of the field effect transistor. It is good to measure.
By doing this, when the gate voltage of the field effect transistor exceeds the threshold value, the motor control device can determine that the reflux in the reflux circuit is not properly performed, and can notify the user to that effect. As a result, when there is a failure related to the field effect transistor, it is possible to notify the user to that effect at an early stage.

In the above motor control device, the threshold may be a value equal to or higher than the voltage of the power supply and equal to or lower than a withstand voltage of the field effect transistor.
If a voltage higher than the voltage of the power supply is applied to the field effect transistor, the operation of the motor may be impaired. In addition, if a voltage higher than the withstand voltage is applied to the field effect transistor, the field effect transistor may be short-circuited.
Therefore, according to the above configuration, the operation of the motor may be defective, and the user can be notified of the abnormality of the reflux circuit before the drain-gate of the field effect transistor is short-circuited. As a result, it is possible to prevent in advance the failure of the field effect transistor constituting the reflux circuit.

In the above motor control device, the motor can be operated in a first operation mode which is an operation mode at the normal time and a second operation mode which is the operation mode at the time of abnormality, and the abnormality notification processing unit The motor may be operated in the second operation mode as the notification process.
In this way, the user can determine whether or not an abnormality has occurred in the return circuit based on the operation of the motor. This makes it easy for the user to easily determine the state of the reflux circuit.

In the above motor control device, the rotational speed of the motor in the second operation mode may be slower than the rotational speed of the motor in the first operation mode.
In this way, when an abnormality occurs in the reflux circuit, it becomes easy to recognize the abnormality in the reflux circuit by the operation of the motor. Further, the load can be reduced when an abnormality occurs in the reflux circuit. Thereby, the progress of the failure in the motor control device can be suppressed.

In the above-described motor control device, the second operation mode may be an operation mode in which the motor is caused to be inching operation by repeating operation and stop.
This makes it easier for the user to recognize that an abnormality has occurred in the freewheeling circuit.

In the above motor control device, the motor may be driven to switch the opening and closing of an opening and closing member provided in the vehicle.
By doing this, it is possible to early notify the user of the abnormality of the return circuit related to the motor for switching the opening and closing of the opening and closing member of the vehicle. As a result, it is possible to cope with the early repair and replacement before a serious failure occurs in the device for opening and closing the opening and closing member of the vehicle.

  According to the present invention, it is possible to notify the user of an abnormality in the motor's return circuit early.

It is a block diagram of a power window apparatus. It is a block diagram of a motor control device concerning one embodiment of the present invention. It is a figure explaining the flow of the electric current in a motor control apparatus when a reflux circuit is normal. It is a figure explaining the flow of the electric current in a motor control apparatus when a reflux circuit is normal. It is a figure explaining the flow of the electric current in a motor control apparatus when there is abnormality in a reflux circuit. It is a figure explaining the flow of the electric current in a motor control apparatus when there is abnormality in a reflux circuit. It is a figure explaining the relationship between the gate voltage of FET for reflux, and abnormality alerting | reporting process. It is a figure explaining the function with which a motor control device is equipped. It is a flowchart which shows the control processing of the motor by a motor control apparatus.

Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 9.
The configuration described below does not limit the present invention, and various modifications can be made within the scope of the present invention.

<Configuration of Power Window Device 1>
A power window device 1 provided with a motor control device 10 according to an embodiment of the present invention will be described below.
As shown in FIG. 1, the power window device 1 raises / lowers (opens / closes) the window glass 4 as a moving member disposed on the door 3 of the vehicle by rotational driving of the motor 5. The power window device 1 includes an elevation mechanism 2 for opening and closing the window glass 4, a motor control device 10 for controlling the operation of the elevation mechanism 2, and an operation switch 24 for instructing the occupant to operate.

In this example, the window glass 4 is moved up and down along the rails (not shown) between the upper fully closed position and the lower fully open position.
The lifting mechanism 2 of this example includes a motor 5 having a reduction mechanism fixed to the door 3, a lifting arm 6 having a fan-shaped gear 6a driven by the motor 5, and a lifting support 6 as a cross with the lifting arm 6 A driven arm 7 and a fixed channel 8 fixed to the door 3 and a glass side channel 9 integral with the window glass 4 are main components.

  The motor 5 of this example receives power supply from the power supply 21 in accordance with the control of the motor control device 10, whereby the windings of the rotor are energized, whereby the magnetics are generated between the rotor and the stator having the magnet. The suction action is generated to rotate the rotor forward and reverse. In the lifting and lowering mechanism 2 of this embodiment, when the lifting and lowering arm 6 and the driven arm 7 swing according to the rotation of the motor 5, their respective end portions are subjected to slide regulation by the fixed channel 8 and the glass side channel 9, Drive as a link to raise and lower the window glass 4.

<< Configuration of Motor Control Device 10 >>
Next, the hardware configuration of the motor control device 10 that controls the motor 5 will be described based on FIG. In the example shown in FIG. 2, the motor 5 is a brushed motor, but the motor control device 10 may be a circuit that controls a brushed motor.

  As shown in FIG. 2, the motor control device 10 includes a power supply 21, a relay circuit 22, an operation switch 24, a switch interface circuit 25, a PWM FET 26, a PWM drive circuit 27, a voltage monitor circuit 28, a return circuit 30 and a control unit 40 is provided.

  The power supply 21 is a DC power supply. Specifically, the power source 21 is a battery mounted on a vehicle.

The relay circuit 22 includes a first switch 22A and a second switch 22B, and is a circuit that switches on and off of the first switch 22A and the second switch 22B according to the control of the control unit 40.
The relay circuit 22 is a circuit that connects the power supply 21 and the motor 5 and controls conduction between the power supply 21 and the motor 5 in response to switching on and off of the first switch 22A and the second switch 22B. Control the forward and reverse rotation of the

  For example, when both the rising switch and the lowering switch of the operation switch 24 are off, the control unit 40 turns off both the first switch 22A and the second switch 22B, and causes the current to flow from the power supply 21 to the motor 5 I will not. In this case, the motor 5 does not operate.

  Further, for example, when the raising switch of the operation switch 24 is on, the control unit 40 switches only the first switch 22A to ON, and the power supply 21 to the first switch 22A, the motor 5, and the second switch 22B in this order. The motor 5 is operated by supplying current. The direction in which current flows in the order of the first switch 22A, the motor 5, and the second switch 22B is a forward direction, and the rotation direction of the motor 5 in this case is a forward rotation. When the motor 5 rotates forward, the lifting mechanism 2 operates to lift the window glass 4.

  In addition, for example, when the lowering switch of the operation switch 24 is on, the control unit 40 switches only the second switch 22B on, and the power supply 21 to the second switch 22B, the motor 5, and the first switch 22A in this order The motor 5 is operated by supplying current. The direction in which current flows in the order of the second switch 22B, the motor 5, and the first switch 22A is reverse, and the direction of rotation of the motor 5 at this time is reverse. Then, when the motor 5 is reversely rotated, the lifting mechanism 2 operates to lower the window glass 4.

The operation switch 24 includes a raising switch and a lowering switch, and outputs signals of on / off of the raising switch and the lowering switch to the control unit 40 via the switch interface circuit 25.
As described above, while the lift switch is turned on, the control unit 40 operates the motor 5 so that the window glass 4 is lifted.
Then, while the lowering switch is turned on, the control unit 40 operates the motor 5 so that the window glass 4 is lowered.

  The control unit 40 is a controller that controls the operation of the motor 5. The control unit 40 is connected to the power supply 21, the relay circuit 22, the switch interface circuit 25, the PWM drive circuit 27, and the voltage monitor circuit 28. In this example, the control unit 40 controls the relay circuit 22 and the PWM drive circuit 27 to control the operation of the motor 5.

  The control unit 40 includes a processor 41, a memory 42, and an A / D conversion circuit 43 as a hardware configuration.

  The processor 41 is hardware (for example, a CPU) for executing an instruction set described in a program. Then, the processor 41 executes various arithmetic processing based on programs and data stored in the memory 42, and controls the motor control device 10.

  The memory 42 stores various programs and data. The memory 42 is also used as a work memory of the processor 41. Specifically, the memory 42 stores a threshold value to be compared with the gate voltage of the refluxing FET 31 measured by the voltage monitor circuit 28 described later.

  The A / D conversion circuit 43 is connected to the voltage monitor circuit 28 and converts an analog voltage signal measured by the voltage monitor circuit 28 into digital data (voltage value). Specifically, the voltage monitor circuit 28 is connected to the gate terminal 31G of the return FET 31 and measures an analog voltage signal indicating the potential of the gate terminal 31G. That is, the A / D conversion circuit 43 obtains the voltage value of the gate voltage of the reflux FET 31.

The processor 41 of the control unit 40 generates a drive signal (pulse signal) for driving the output of the motor 5, and inputs the drive signal to the PWM drive circuit 27. The PWM drive circuit 27 controls the gate voltage applied to the gate terminal of the FET 26 for PWM in accordance with the drive signal of the motor 5. The PWM FET 26 is a switching element for adjusting the amount of current supplied from the power supply 21 to the motor 5.
Thus, the output of the motor 5 can be controlled by switching the PWM FET 26 on and off in accordance with the drive signal.

The return circuit 30 is connected in parallel to the relay circuit 22 and is a circuit that returns the current flowing through the motor 5 when the PWM FET 26 is off.
In other words, the return circuit 30 is a circuit provided to return the current flowing from the motor 5 while the supply of the current from the power source 21 to the motor 5 is cut off by the FET 26 for PWM.

  Specifically, the reflux circuit 30 has a FET 31 for reflux. The reflux FET 31 includes a gate terminal 31G, a source terminal 31S, a drain terminal 31D, and a body diode 31B. The body diode 31 B is used as a reflux diode of the reflux circuit 30.

  Here, the path of the current I flowing through the motor control device 10 will be described with reference to FIGS. 3 to 6. 3 to 6 show a part of the motor control device 10 in a simplified manner. In the example described below, the case where the first switch 22A of the relay circuit 22 is on and the second switch 22B is off will be described, but the first switch 22A of the relay circuit 22 is off, the second switch 22B The basic operation is the same even when is on.

  FIGS. 3 and 4 correspond to the case where the source terminal 31S of the reflux FET 31 has no contact failure, that is, the case where the reflux circuit 30 is normal. 5 and 6 correspond to the case where there is a contact failure at the source terminal 31S of the reflux FET 31, that is, the case where the reflux circuit 30 has an abnormality.

FIG. 3 shows the path of the current I flowing from the power supply 21 to the motor 5 when the PWM FET 26 is on.
As shown in FIG. 3, the current I flows in a loop through the power supply 21, the first switch 22A, the motor 5, the second switch 22B, and the FET 26 for PWM.

On the other hand, FIG. 4 shows the path of the current I when the PWM FET 26 is off, that is, when the current from the motor 5 flows back.
As shown in FIG. 4, the current I flows in a loop through the motor 5, the second switch 22B, the return FET 31, and the first switch 22A.
When the source terminal 31S and the drain terminal 31D are normally in contact with the reflux circuit 30, the return current of the motor 5 flows through the body diode 31B.

Next, the case where the source terminal 31S of the reflux FET 31 has a contact failure will be described with reference to FIGS. 5 and 6.
As shown in FIGS. 5 and 6, the source terminal 31S has a contact failure, and in this case, current can not flow from the source terminal 31S to the drain terminal 31D.

As shown in FIG. 5, when the PWM FET 26 is on, no current flows on the reflux FET 31 side, so the current I flows in the same path as in FIG.
However, as shown in FIG. 6, when the FET 26 for PWM is off, current flows from the motor 5 to the reflux circuit 30, but the source terminal 31S has a contact failure, so the drain terminal 31D is transmitted through the body diode 31B. I can not flow the current. Therefore, as shown in FIG. 7, the voltage applied to the gate terminal 31G is increased.
In this case, when the gate voltage of the gate terminal 31G exceeds the voltage of the power supply 21, when the PWM FET 26 is switched on, the current does not flow from the power supply 21 toward the motor 5, and the motor 5 may not be driven. It occurs.
Furthermore, when the gate voltage of the gate terminal 31G exceeds the withstand voltage of the reflux FET 31, a short circuit breakdown occurs between the gate terminal 31G and the drain terminal 31D, and when the PWM FET 26 is switched on, the power supply 21 to the reflux FET 31 There is a possibility that a large current will flow to cause the reflux FET 31 to generate heat.

Therefore, in the motor control device 10 according to the present embodiment, when the gate voltage exceeds the threshold value, it is determined that an abnormality occurs in the reflux circuit 30, and an abnormality notification process is performed. That is, the motor controller 10, the gate voltage rises from the normal value V _0, when the threshold is exceeded V _1, determines that an abnormality has occurred, executes abnormality notification processing.
For example, the threshold value V ₁ of the above is be arbitrarily set, as an example is a voltage (voltage of the battery) or more power sources 21 a threshold value V ₁ of the above, the breakdown voltage below the value of the reflux for the FET 31. Of course, the threshold value V ₁ may be set to a value smaller than the voltage of the power supply 21.

Further, in the present embodiment, the motor control device 10 normally operates the motor 5 continuously, and performs the above-mentioned abnormality notification processing by making the motor 5 inching operation at the time of abnormality determination. The above-mentioned inching operation is an operation in which the driving and stopping of the motor 5 are repeated at predetermined time intervals.
Of course, the above-mentioned abnormality notification processing is not limited to the above-mentioned inching operation, and may be realized by outputting an abnormality notification sound or restricting the drive of the motor 5 in another manner. .

<< Functions Provided to Motor Control Device 10 >>
Next, functions provided to the motor control device 10 to realize the above processing will be described.
A functional block diagram of the motor control device 10 is shown in FIG. As shown in FIG. 8, the motor control device 10 includes a voltage measurement unit 11 and an abnormality notification processing unit 12 as functions.
The functions of the respective units provided in the motor control device 10 are realized by the processor 41 controlling the respective units of the control unit 40 based on the programs and data stored in the memory 42. Of course, the motor control device 10 may have functions other than the functions shown in FIG.
The details of the functions of the above-described units provided in the motor control device 10 will be described below.

[Description of Voltage Measurement Unit 11]
The voltage measurement unit 11 measures the voltage of the element that constitutes the reflux circuit 30.
The voltage measurement unit 11 is mainly realized by the control unit 40 and the voltage monitor circuit 28 of the motor control device 10.

  The “element that constitutes the reflux circuit 30” is an electronic component that constitutes the reflux circuit 30. For example, the reflux FET 31 corresponds to an example of the above-mentioned "element which constitutes the reflux circuit 30". Further, a free wheeling diode or the like also corresponds to an example of the above-mentioned "element which constitutes the free wheel circuit 30".

Specifically, the voltage measurement unit 11 measures the gate voltage of the reflux FET 31 (an example of a field effect transistor).
More specifically, the voltage monitoring circuit 28 of the motor control device 10 monitors the voltage of the gate terminal 31G of the freewheeling circuit 30, and outputs the monitored voltage to the A / D conversion circuit 43 of the control unit 40.
The A / D conversion circuit 43 of the control unit 40 converts the analog signal of the voltage input from the voltage monitor circuit 28 into digital data to obtain the voltage value of the gate voltage.

  In addition to the gate terminal 31G of the return FET 31, the voltage measurement unit 11 also detects the gate voltage of the return FET 31, the source terminal 31S, the drain terminal of the PWM FET 26, and the second switch 22B of the relay circuit 22. A terminal of the same potential as the gate terminal 31G such as the NC terminal of the above may be used.

[Description of abnormality notification processing unit 12]
The abnormality notification processing unit 12 executes an abnormality notification process for notifying an abnormality of the reflux circuit 30. The abnormality notification processing unit 12 determines whether to execute the abnormality notification process based on the voltage measured by the voltage measurement unit 11.
The abnormality notification processing unit 12 is mainly realized by the control unit 40 of the motor control device 10 and the relay circuit 22.

  The “abnormal notification process” is a process for notifying the user of an abnormality in the reflux circuit 30. For example, operating the motor 5 in an operation mode different from the operation mode at the normal time corresponds to an example of the above-mentioned "error notification processing". Also, outputting a special sound that is not output at normal times, or limiting the operation of the motor 5 is also equivalent to an example of the above-mentioned "error notification processing".

When the voltage measured by the voltage measurement unit 11 exceeds a threshold, the abnormality notification processing unit 12 executes an abnormality notification process. Specifically, when the gate voltage of the reflux FET 31 measured by the voltage measurement unit 11 exceeds the threshold value, the abnormality notification processing unit 12 executes the abnormality notification process.
Although the above threshold can be set arbitrarily, for example, the threshold is a value equal to or higher than the voltage of the power supply 21 and is equal to or lower than the gate withstand voltage of the reflux FET 31.
By doing this, the operation of the motor 5 is affected, and the user can be notified of the abnormality of the reflux circuit 30 before the reflux FET 31 is short-circuited.

Further, the motor 5 can operate in a first operation mode which is an operation mode at the normal time and a second operation mode which is an operation mode at the abnormal time.
For example, the rotational speed of the motor in the second operating mode is slower than the rotational speed of the motor in the first operating mode.
Specifically, the first operation mode is a continuous operation mode that operates continuously, and the second operation mode is an operation mode that repeatedly performs operation and stop to operate the motor in an inching operation.

In the present embodiment, the abnormality notification processing unit 12 operates the motor 5 in the second operation mode (that is, the inching mode) as the abnormality notification processing.
Specifically, the processor 41 of the control unit 40 sets the operation mode of the motor 5 when the voltage value of the gate voltage obtained by the A / D conversion circuit 43 exceeds the threshold value V1 stored in the memory 42. Set to dynamic mode.
In the inching mode, for example, the processor 41 intermittently controls energization of the motor 5 from the power supply 21 by switching on and off the relay circuit 22 at predetermined time intervals. By doing this, in the inching mode, the motor 5 operates to repeat driving and stopping.
The control of the operation of the motor 5 in the inching mode may be performed by the control unit 40 controlling a drive signal to the PWM drive circuit 27.

<Control flow by motor control device 10>
Next, control processing of the motor 5 executed by the motor control device 10 will be described with reference to FIG. The flow shown in FIG. 9 is a process that starts when the up switch (or down switch) of the operation switch 24 is turned on.

  As shown in FIG. 9, the motor control device 10 performs initialization processing of the power window device 1 (S1), and then starts driving of the motor 5 by PWM control (S2).

  The motor control device 10 monitors the value of the gate voltage of the reflux FET 31 of the reflux circuit 30 by the voltage monitor circuit 28 (S3). When the gate voltage value exceeds the threshold (S4: Yes), the motor control device 10 sets the operation mode of the motor 5 to the inching mode (S5). On the other hand, when the gate voltage value does not exceed the threshold (S4: No), the motor control device 10 sets the operation mode of the motor 5 to the normal mode (continuous operation mode) (S6).

  The motor control device 10 operates the motor 5 in the set operation mode (S7), and when the operation switch 24 is not switched off (S8: No), returns to S2 and continues the process, and the operation is performed. When the switch 24 is switched off (S8: Yes), the motor 5 is stopped (S9), and the process is ended.

According to the above process, when the gate voltage of the reflux FET 31 of the reflux circuit 30 rises and exceeds the threshold value, the motor 5 operates in the inching mode, so the user operates the window glass 4 in the power window device 1. It can be recognized that an abnormality has occurred in the reflux circuit 30 from the behavior of
By doing this, the user can promptly carry out the repair and replacement of the power window device 1 and the motor control device 10.

<Other Embodiments>
The present invention is not limited to the above embodiment.
For example, although the brushed motor is used as the motor 5 in the above embodiment, the present invention is similarly applicable to a circuit using a brushless motor.

  Moreover, although said example demonstrated the example which used the field effect transistor as a reflux diode which comprises the reflux circuit 30, you may use another element provided with a diode.

  Moreover, although the example which applied this invention to the power window apparatus 1 was shown in said embodiment, it can apply not only to this but the general apparatus which has a motor. For example, the present invention is also applicable as a motor control device that controls a motor for opening and closing a slide door (an example of an opening and closing member) of a vehicle.

<Summary>
The motor control device 10 according to the present embodiment controls the motor 5. In the motor control device 10, the supply of current from the power supply 21 to the motor 5 is interrupted by the PWM FET 26 (an example of a switching element) for adjusting the amount of current supplied from the power supply 21 to the motor 5. In the meantime, a feedback circuit 30 provided for refluxing the current flowing from the motor 5, a voltage measurement unit 11 for measuring the voltage of the elements constituting the feedback circuit 30, and a notification of abnormality of the feedback circuit 30. And an abnormality notification processing unit 12 that executes an abnormality notification process. Based on the voltage measured by the voltage measurement unit 11, the abnormality notification processing unit 12 determines whether or not to execute the abnormality notification process.
According to the motor control device 10, the abnormality of the reflux circuit 30 can be detected by the voltage measured from the reflux circuit 30 of the motor 5, and the occurrence of the abnormality can be notified to the user. As a result, it is possible to early notify the user of the abnormality in the return circuit 30 of the motor 5.

In the motor control device 10, the abnormality notification processing unit 12 executes the abnormality notification process when the voltage measured by the voltage measurement unit 11 exceeds the threshold.
In the case where a high voltage is applied to the elements constituting the reflux circuit 30 of the motor 5, there is a possibility that the reflux is not properly performed. Therefore, when a high voltage is applied to the elements of the reflux circuit 30, the motor control device 10 can determine that there is an abnormality in the reflux circuit 30, and can notify the user to that effect.

In the motor control device 10, the reflux circuit 30 has a reflux FET 31 (an example of a field effect transistor), and the body diode 31B of the reflux FET 31 becomes a reflux diode of the reflux circuit 30. Then, the voltage measurement unit 11 measures the gate voltage of the reflux FET 31.
By doing this, when the gate voltage of the refluxing FET 31 exceeds the threshold value, the motor control device 10 can determine that the refluxing in the refluxing circuit 30 is not properly performed, and can notify the user to that effect. As a result, when there is a failure related to the reflux FET 31, it is possible to notify the user to that effect at an early stage.

In the motor control device 10, the threshold value may be equal to or higher than the voltage of the power supply 21 and equal to or lower than the withstand voltage of the return FET 31.
When a voltage higher than the voltage of the power supply 21 is applied to the return FET 31, a problem may occur in the operation of the motor 5. In addition, if a voltage larger than the withstand voltage is applied to the reflux FET 31, there is a possibility that the reflux FET 31 may be short-circuited.
Therefore, according to the above configuration, a malfunction may occur in the operation of the motor 5, and the user can be notified of a malfunction in the reflux circuit 30 before a short circuit between the drain and the gate of the reflux FET 31 is broken. As a result, it is possible to prevent the failure of the reflux FET 31 that constitutes the reflux circuit 30 in advance.

In the motor control device 10, the motor 5 can operate in the first operation mode, which is the normal operation mode, and the second operation mode, which is the abnormal operation mode, and the abnormality notification processing unit 12 performs abnormality notification processing. The motor is operated in the second operation mode.
By doing this, the user can determine based on the operation of the motor 5 whether or not an abnormality has occurred in the reflux circuit 30. This makes it easy for the user to easily determine the state of the reflux circuit 30.

In the motor control device 10, the rotational speed of the motor in the second operation mode is lower than the rotational speed of the motor in the first operation mode.
By doing this, when an abnormality occurs in the reflux circuit 30, it becomes easy to recognize the abnormality in the reflux circuit 30 by the operation of the motor 5. Moreover, the load in the case where an abnormality occurs in the reflux circuit 30 can be reduced. Thereby, the progress of the failure in the motor control device can be suppressed.

In the motor control device 10, the second operation mode is an operation mode in which the motor is repeatedly operated in an inching operation.
This makes it easier for the user to recognize that an abnormality has occurred in the reflux circuit 30.

In the motor control device 10, the motor 5 is driven to switch the opening and closing of the opening and closing member provided in the vehicle.
By doing this, it is possible to early notify the user of the abnormality of the reflux circuit 30 related to the motor 5 for switching the opening and closing of the opening and closing member of the vehicle. As a result, it is possible to cope with the early repair and replacement before a serious failure occurs in the device (power window device 1) for opening and closing the opening and closing member of the vehicle.

1 Power Window Device 2 Lifting Mechanism 3 Door 4 Window Glass (Opening and Closing Member)
DESCRIPTION OF SYMBOLS 5 motor 6 raising / lowering arm 6a gear 7 driven arm 8 fixed channel 9 glass side channel 10 motor control apparatus 11 voltage measurement part 12 abnormality alert processing part 21 power supply 22 relay circuit 22A 1st switch 22B 2nd switch 24 operation switch 25 switch interface circuit 26 FET for PWM
27 PWM drive circuit 28 voltage monitor circuit 30 reflux circuit 31 FET for reflux
31B body diode 31D drain terminal 31G gate terminal 31S source terminal 40 control unit 41 processor 42 memory 43 A / D conversion circuit I current

Claims (8)

A motor controller for controlling a motor,
A switching element for adjusting an amount of current supplied from a power source to the motor;
A return circuit provided for returning the current flowing from the motor while the supply of current from the power source to the motor is cut off by the switching element;
A voltage measurement unit that measures a voltage of an element that constitutes the reflux circuit;
And an abnormality notification processing unit that executes abnormality notification processing for notifying the abnormality of the circulation circuit.
The motor control device according to claim 1, wherein the abnormality notification processing unit determines whether to execute the abnormality notification processing based on a voltage measured by the voltage measurement unit.   The motor control device according to claim 1, wherein the abnormality notification processing unit executes the abnormality notification process when the voltage measured by the voltage measurement unit exceeds a threshold. The reflux circuit comprises a field effect transistor,
The body diode of the field effect transistor becomes the free wheeling diode of the freewheeling circuit,
The motor control device according to claim 2, wherein the voltage measurement unit measures a gate voltage of the field effect transistor.   The motor control device according to claim 3, wherein the threshold is a value equal to or higher than the voltage of the power supply and equal to or less than a withstand voltage of the field effect transistor. The motor is operable in a first operation mode, which is a normal operation mode, and a second operation mode, which is an abnormal operation mode,
The motor control device according to any one of claims 1 to 4, wherein the abnormality notification processing unit operates the motor in the second operation mode as the abnormality notification processing.   The motor control device according to claim 5, wherein a rotational speed of the motor in the second operation mode is lower than a rotational speed of the motor in the first operation mode.   The motor control device according to claim 6, wherein the second operation mode is an operation mode in which the motor is caused to move in an inching operation by repeating operation and stop.   The motor control device according to any one of claims 1 to 7, wherein the motor is driven to switch the opening and closing of an opening and closing member provided in the vehicle.

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