JP2019161712A - Motor driving device and air blowing device with the same mounted therein - Google Patents

Abstract

To solve the problem that it is difficult to downsize a motor driving device or a DC motor with the same mounted therein since it is necessary to provide a write voltage terminal when writing information into the motor driving device.SOLUTION: A magnitude of a power supply voltage to be supplied to a motor driving device is set to a write voltage, such that a write voltage for writing information in a storage unit is supplied to an information rewriting unit. An input/output destination of a signal inputted/outputted by a signal switching unit is switched from a rotation control unit to the storage unit, such that information can be written into the storage unit. Thus, it is not necessary to provide an independent terminal in the motor driving device, thereby downsizing the motor driving device or a DC motor with the same mounted therein.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a motor drive device used in a blower such as a ceiling-embedded ventilation fan, for example, and relates to a technique for writing information used to control a drive target device.

  In recent years, DC motors represented by brushless DC motors and their driving devices (DC motor driving devices) have high efficiency, that is, power saving and excellent durability. Or, mounting on a blower such as a ceiling fan is increasing. Such DC motors and their driving devices are required to be further reduced in cost and size.

  In addition, in order for the drive device to control the target device, information such as a program and parameters stored in a storage unit provided in the drive device may be used. It is required to improve the performance of the DC motor by rewriting this information to information desired by the user after the product is shipped according to the usage situation of the user.

  For example, Patent Document 1 discloses an electronic control device that can write information to a storage device without providing a terminal for writing information to the electronic control device.

  Such an electronic control device includes a microcomputer having a memory in a control unit that controls the control target device, and the control unit controls the drive state of the control target device, and writes information. Included mode. Then, by inputting a predetermined signal to an existing input / output terminal used for input / output of a signal required for control of the control target device, the control mode and the write mode can be switched and information can be written to the memory. it can.

  As described above, in the electronic control device disclosed in Patent Document 1, the microcomputer is controlled in response to a predetermined signal input to an existing input / output terminal that is used for input / output of a signal necessary for controlling the control target device. Switch from mode to write mode. As a result, information is written only by existing input / output terminals. Therefore, information can be written into the memory without providing a dedicated write terminal in the electronic control unit.

JP 2017-14156 A

  According to the electronic control device of Patent Document 1 described above, it is possible to write information to the storage unit without providing a write-only terminal. However, when writing information to the storage unit, the write voltage is still rewritten. A storage device that needs to be supplied to the unit is used. When information is written using such a storage device, a terminal for supplying a write voltage to the information rewriting unit is still necessary. If a terminal for supplying such a write voltage is provided in the motor drive device, there is a problem that the motor drive device becomes larger by that amount.

  SUMMARY An advantage of some aspects of the invention is that it provides a motor drive device capable of writing information in a storage unit without providing a terminal for supplying a write voltage to the drive device. .

  In order to achieve the above-described object, a motor driving device according to the present invention is based on a storage unit that stores information for rotating a DC motor, an input motor control signal, and information acquired from the storage unit. A rotation control unit that controls the rotation of the motor, a voltage measurement unit that measures the supplied power supply voltage, a comparison unit that compares the power supply voltage measured by the voltage measurement unit with a predetermined voltage threshold, and a comparison result of the comparison unit The supply switching unit that supplies the power supply voltage supplied based on the power supply to the DC motor or the storage unit, and the information stored in the storage unit using the power supply voltage supplied via the supply switching unit And an information rewriting unit that rewrites the information to new information. By supplying the power supply voltage as the write voltage, the supply switching unit can supply the power supply voltage to the information rewriting unit and write the storage unit. By transitioning to a state configured to allow writing of information.

  Since the motor drive device according to the present invention has such a configuration, it is not necessary to provide a terminal for supplying a write voltage to the motor drive device for writing information, and the motor drive device can be miniaturized.

Functional block diagram of a motor drive device according to the present invention The figure which shows an example of the concrete circuit structure of a motor drive device The figure which shows an example of the waveform of each part in an example of the concrete circuit structure of a motor drive device. The figure which shows an example of the concrete circuit structure of the motor drive device 1 The figure which shows an example of the waveform of each part in an example of the concrete circuit structure of the motor drive device 1. The figure which shows the Example of the ceiling embedded type ventilation fan 27 to which the brushless DC motor 2 carrying the motor drive device 1 concerning this invention is applied.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a motor drive device according to the present invention will be described in detail based on the drawings. In the embodiment described below, an example in which the motor driving device 1 is applied to drive the brushless DC motor 2 will be described. However, the target device controlled by the motor driving device 1 is not limited to the brushless DC motor, and other DC motors may be controlled.

(Embodiment 1)
FIG. 1 is a diagram schematically showing the overall configuration of a motor drive device 1 and a brushless DC motor 2 to be driven in the present embodiment. In FIG. 1, a part of the motor drive device 1 is shown as a functional block. The motor driving device 1 is configured to be connected to a brushless DC motor 2. Further, a terminal (not shown) for inputting / outputting the speed command signal 17 and the rotation speed output signal 18 to / from the outside as motor control signals is provided.

  The power source is connected to the motor driving device 1 and configured to supply the power source voltage 6 to the motor driving device 1.

  The control power supply is connected to the motor drive device 1 and is configured to supply the control voltage 7 to the motor drive device 1.

  The brushless DC motor 2 includes a stator 3 and a rotor 5.

  The stator 3 is wound with a winding 4 for generating a rotating magnetic field.

  The rotor 5 is configured by, for example, arranging a permanent magnet on a side surface so as to rotate by a rotating magnetic field generated by a motor current supplied to the winding 4 from an inverter circuit 16 described later.

  The motor drive device 1 includes an inverter circuit 16, a rotation control unit 11, a storage unit 9, an information rewriting unit 10, a supply switching unit 12, a signal switching unit 15, a voltage measurement unit 13, and a comparison unit 14. The inverter circuit 16 adjusts the motor voltage applied to the winding 4 based on the control signal input by the rotation control unit 11. Specifically, the power source voltage 6 supplied to the inverter circuit 16 through the supply switching unit 12 is PWM-controlled based on the input control signal, thereby adjusting the motor voltage applied to the winding 4 and the stator 3 A rotating magnetic field is generated.

  The rotation control unit 11 determines a control signal to be output to the inverter circuit 16 based on information such as a program and parameters read from the storage unit 9 and a speed command signal 17 input through the signal switching unit 15, and the inverter circuit 16 Output a control signal. Further, a rotation speed output signal 18 corresponding to the rotation of the rotor 5 is output to the outside through the signal switching unit 15.

  The storage unit 9 stores information such as programs and parameters used by the rotation control unit 11 to determine a control signal, and is configured to cause the rotation control unit 11 to read the information.

  The information rewriting unit 10 is connected to the storage unit 9 and configured to write information in the storage unit 9. In the present embodiment, an example will be described in which the EEPROM 8 is applied, which includes the storage unit 9 and the information rewriting unit 10 and requires a write voltage when writing information. However, the storage unit 9 and the information rewriting unit 10 are not limited to the EEPROM. That is, another storage device that requires a writing voltage when writing information may be used, or the storage unit 9 and the information rewriting unit 10 that requires a writing voltage when writing information are separated. But you can.

  The supply switching unit 12 is configured to switch the supply destination of the power supply voltage 6 to the inverter circuit 16 or the information rewriting unit 10 based on the signal input from the comparison unit 14.

  The signal switching unit 15 is configured to switch the input / output destination of the signal input / output from the outside to the rotation control unit 11 or the storage unit 9 based on the signal input from the comparison unit 14.

  The voltage measurement unit 13 measures the power supply voltage 6 supplied from the power supply, and outputs the measurement result to the comparison unit 14.

  The comparison unit 14 compares the measurement result input from the voltage measurement unit 13 with a predetermined voltage threshold value, and outputs the result to the supply switching unit 12 and the signal switching unit 15.

  When the comparison result by the comparison unit 14 is larger or smaller than a predetermined voltage threshold, the supply switching unit 12 switches the supply destination of the power supply voltage 6 to the inverter circuit 16. Further, the signal switching unit 15 outputs the rotation speed output signal 18 output from the rotation control unit 11 to the outside by switching the output destination of the speed command signal 17 input from the outside to the rotation control unit 11.

  On the other hand, when it is determined that the comparison result by the comparison unit matches the predetermined voltage threshold, the supply switching unit 12 switches the supply destination of the power supply voltage 6 to the information rewriting unit 10, so that the signal switching unit 15 The input / output destination of the input / output signal is switched from the rotation control unit 11 to the storage unit 9. The predetermined voltage threshold described above is, for example, a write voltage necessary for the information rewriting unit 10 to write information in the storage unit 9.

  When the power supply voltage 6 matches the write voltage, the information rewriting unit 10 is sufficiently supplied with the power supply voltage 6 from the supply switching unit 12 to newly write the information stored in the storage unit 9. Thus, a large write voltage is supplied. That is, the storage unit 9 transitions to a state in which information can be written by supplying the power supply voltage 6.

  Further, the signal switching unit 15 switches the input / output destination of the signal input / output from the outside from the rotation control unit 11 to the storage unit 9, so that a new one for writing to the storage unit 9 from the outside through the signal switching unit 15. Information can be output to the storage unit 9 and information can be written to the storage unit 9.

  FIG. 2 is an example of a specific circuit configuration of the voltage measurement unit 13, the comparison unit 14, the supply switching unit 12, and the signal switching unit 15 in the present embodiment.

  The voltage measuring unit 13 includes a voltage dividing resistor A19a and a ground A20a, and the voltage dividing resistor A19a is connected to a power source. The voltage dividing resistor A19a adjusts the voltage and outputs the power supply voltage 6 supplied from the power supply.

  The comparison unit 14 includes a voltage dividing resistor B19b, a voltage dividing resistor C19c, a ground B20b, a comparator A21, a comparator B22, and a pull-up resistor 23.

  The voltage dividing resistor B19b is connected to the ground B20b and the control power supply, and outputs a write adjustment voltage to the comparator A21. The write adjustment voltage is a voltage output from the voltage measurement unit 13 when the power supply voltage 6 is the write voltage.

  The voltage dividing resistor C19c is connected to the ground B20b and the control power supply, and outputs a write adjustment voltage to the comparator B22.

  The comparator A21 receives the voltage output from the voltage measurement unit 13 and the write adjustment voltage output from the voltage dividing resistor B19b, and compares the input voltages. When the voltage output from the voltage measuring unit 13 is equal to or lower than the write adjustment voltage, that is, when the power supply voltage 6 is equal to or lower than the write voltage, the control voltage 7 is output. When the voltage output from the voltage measuring unit 13 is larger than the write adjustment voltage, that is, when the power supply voltage 6 is larger than the write voltage, the voltage of the ground B 20 b is output.

  The comparator B22 receives the voltage output from the voltage measurement unit 13 and the write adjustment voltage output from the voltage dividing resistor C19c, and compares the input voltage. When the voltage output from the voltage measurement unit 13 is equal to or higher than the write adjustment voltage, that is, when the power supply voltage 6 is equal to or higher than the write voltage, the control voltage 7 is output. When the voltage output from the voltage measuring unit 13 is smaller than the write adjustment voltage, that is, when the power supply voltage 6 is smaller than the write voltage, the voltage of the ground B20b is output.

  The pull-up resistor 23 has a control power supply connected to the output portions of the comparators A21 and B22. Accordingly, when both the comparator A 21 and the comparator B 22 output the control voltage 7, the comparison unit 14 outputs the control voltage 7 to the supply switching unit 12 and the signal switching unit 15. When either the comparator A21 or the comparator B22 is outputting the voltage of the ground B20b, the voltage of the ground B20b is output to the supply switching unit 12 and the signal switching unit 15.

  The supply switching unit 12 includes a switch A24. When the voltage input from the comparison unit 14 is the control voltage 7, the switch A24 switches the connection destination of the power supply voltage 6 to the information rewriting unit 10, while the voltage input from the comparison unit 14 is the voltage of the ground B20b. The connection destination is switched to the inverter circuit 16.

  The signal switching unit 15 includes a switch B25 and a switch C26. When the voltage input from the comparison unit 14 is the control voltage 7, the switch B25 and the switch C26 switch the connection destination of the input signal to the storage unit 9. On the other hand, when the voltage input from the comparison unit 14 is the voltage of the ground B20b, the connection destination of the input signal is switched to the circuit control unit.

  FIG. 3 shows an example of the waveform of the power supply voltage 6 and the voltage output from the comparison unit 14 in the present embodiment.

  In the above configuration, in order to drive the brushless DC motor 2, when the power supply voltage 6 supplied to the motor driving device 1 is the driving voltage (range A), the voltage output from the comparison unit 14 is the voltage of the ground B20b. Become. In this case, the supply switching unit 12 switches the supply destination of the power supply voltage 6 to the inverter circuit 16, and the signal switching unit 15 switches the signal input / output destination to the rotation control unit 11.

  On the other hand, when the power supply voltage 6 supplied to the motor drive device 1 is used as the write voltage in order to write new information in the storage unit 9 (range B), the voltage output from the comparison unit 14 is the control voltage 7. In this case, the supply switching unit 12 switches the supply destination of the power supply voltage 6 to the information rewriting unit 10, and the signal switching unit 15 switches the signal input / output destination to the storage unit 9.

  Thus, according to the motor drive device 1 in the present embodiment, the information in the storage unit 9 is written into the information rewriting unit 10 by setting the power supply voltage 6 supplied to the motor drive device 1 to the write voltage. A write voltage is supplied. At this time, by switching the input / output destination of the signal input / output by the signal switching unit 15 from the rotation control unit 11 to the storage unit 9, new information to be written in the storage unit 9 can be output. Therefore, since it is not necessary to provide a terminal for supplying a separate independent write voltage to the information rewriting unit 10 in order to write information in the storage unit 9, the motor driving device 1 can be reduced in size.

(Embodiment 2)
4, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted. FIG. 4 shows that in the first embodiment, the comparison unit 14 outputs the control voltage 7 when the magnitude of the power supply voltage 6 is equal to or lower than the write voltage, and the ground B20b when the magnitude of the power supply voltage 6 is larger than the write voltage. It is an example of a specific circuit configuration when it is configured to output the above voltage.

  In the present embodiment, the comparison unit 14 includes a voltage dividing resistor B19b, a ground B20b, a comparator A21, a control voltage 7, and a pull-up resistor 23.

  The voltage dividing resistor B19b is connected to the ground B20b and the control power supply, and outputs a write adjustment voltage to the comparator A21. The write adjustment voltage is a voltage output from the voltage measurement unit 13 when the power supply voltage 6 is the write voltage.

  The comparator A21 receives the voltage output from the voltage measurement unit 13 and the write adjustment voltage output from the voltage dividing resistor B19b, and compares the input voltages. When the voltage output from the voltage measuring unit 13 is equal to or lower than the write adjustment voltage, that is, when the power supply voltage 6 is equal to or lower than the write voltage, the control voltage 7 is output. When the voltage output from the voltage measuring unit 13 is larger than the write adjustment voltage, that is, when the power supply voltage 6 is larger than the write voltage, the voltage of the ground B 20 b is output.

  The pull-up resistor 23 has a control power supply connected to the output section of the comparator A21. Thereby, when the comparator A <b> 21 outputs the control voltage 7, the comparison unit 14 outputs the control voltage 7 to the supply switching unit 12 and the signal switching unit 15. When the comparator A21 outputs the voltage of the ground B20b, the comparison unit 14 outputs the voltage of the ground B20b to the supply switching unit 12 and the signal switching unit 15.

  FIG. 5 shows an example of the waveform of the power supply voltage 6 and the voltage output from the comparison unit 14 in the present embodiment.

  In the above configuration, when the power supply voltage 6 supplied to the motor driving device 1 is equal to or lower than the write voltage (C range), the voltage output from the comparison unit 14 is the control voltage 7. In this case, the supply switching unit 12 switches the supply destination of the power supply voltage 6 to the information rewriting unit 10, and the signal switching unit 15 switches the signal input / output destination to the storage unit 9.

  On the other hand, when the power supply voltage 6 supplied to the motor drive device 1 is higher than the write voltage (range D), the voltage output from the comparison unit 14 is the voltage of the ground B20b. In this case, the supply switching unit 12 switches the supply destination of the power supply voltage 6 to the inverter circuit 16, and the signal switching unit 15 switches the signal input / output destination to the rotation control unit 11.

  Thus, according to the motor drive device 1 in the present embodiment, the magnitude of the power supply voltage 6 supplied to the motor drive device 1 is set to be equal to or lower than the write voltage. Then, a write voltage for writing information in the storage unit 9 is supplied to the information rewriting unit 10, and the input / output destination of the signal input / output by the signal switching unit 15 is switched from the rotation control unit 11 to the storage unit 9. Therefore, new information to be written to the storage unit 9 can be output, and the same effect as in the first embodiment can be obtained.

(Embodiment 3)
The motor driving device 1 in the first embodiment or the second embodiment described above and the stator 3 of the brushless DC motor 2 and the winding 4 wound around the stator 3 are both molded with a thermosetting resin. Also good. When a terminal for supplying a write voltage to the information rewriting unit 10 is provided in the molded motor driving device 1 or the stator 3 of the brushless DC motor 2 and the winding 4 wound around the stator 3, There are many problems in providing such as the need to change the mold for this purpose.

  By applying the motor driving device 1 according to the first embodiment or the second embodiment to this problem, information can be written in the storage unit 9 using only existing terminals, and the molded motor driving device 1 or In the stator 3 of the brushless DC motor 2 and the winding 4 wound around the stator 3, new information can be easily written in the storage unit 9.

(Embodiment 4)
FIG. 6 shows an example of a usage situation when the third embodiment is applied to the ceiling-embedded ventilation fan 27.

  The ceiling-embedded ventilation fan 27 has a configuration in which vanes are attached to the brushless DC motor equipped with the motor driving device 1 described in Embodiment 3 so that air can be blown, and the ceiling-embedded ventilation fan 27 is incorporated in the ceiling-mounted ventilation fan 27. Has been made.

  The duct 28 is connected to the ceiling-embedded ventilation fan 27 and an exhaust port 29 described later, and is configured to send the air sent from the ceiling-embedded ventilation fan 27 to the exhaust port 29.

  The exhaust port 29 is connected to the duct 28 and is configured to send the wind sent from the ceiling-embedded ventilation fan 27 to the outside through the duct 28.

  According to such a configuration, the ceiling-embedded ventilation fan 27 according to the present embodiment is equipped with the motor driving device 1 according to the first or second embodiment, so that information can be easily written. it can. Therefore, the rotation of the blades described above can be controlled in accordance with the use situation by writing new information.

  For example, in FIG. 6A, when the length of the duct 28 attached to the above-described ceiling-embedded ventilation fan 27 is short and it is necessary to achieve the purpose of reducing the rotation of the above-described blades, By writing new information that reduces the rotation, the above-described object can be achieved.

  On the other hand, in FIG. 6B, when the length of the duct 28 attached to the ceiling-embedded ventilation fan 27 is long and it is necessary to achieve the purpose of increasing the rotation of the blades, By writing new information that increases the number of rotations, the above-described object can be achieved.

  That is, since the motor drive device used for the blower, particularly the ceiling-embedded ventilator, has a duct length or the like that differs depending on the situation, a switch for switching the setting is provided outside. However, once set, there is no change thereafter, so the cost and size of such a switch are problematic with respect to the frequency of use. The motor driving device according to the present invention can also solve the problems peculiar to such a ceiling-embedded ventilation device.

(Outline of the embodiment)
A motor driving apparatus according to the present invention includes a storage unit that stores information for rotating a DC motor, and a rotation control that controls the rotation of the DC motor based on an input motor control signal and information acquired from the storage unit. Unit, a voltage measurement unit that measures the supplied power supply voltage, a comparison unit that compares the power supply voltage measured by the voltage measurement unit with a predetermined voltage threshold, and a power supply voltage that is supplied based on the comparison result of the comparison unit Information supply for rewriting the information stored in the storage unit with new information using the supply switching unit that supplies the supply destination to the DC motor or the storage unit and the power supply voltage supplied via the supply switching unit And a section.

  As a result, by supplying the power supply voltage as the write voltage, the supply switching unit supplies the power supply voltage to the information rewriting unit, and the storage unit transitions to a writable state. Writing becomes possible. Accordingly, since it is not necessary to provide a terminal for supplying a write voltage to the motor driving device, the motor driving device can be reduced in size.

  In addition, a signal switching unit that receives the input motor control signal and transmits the received motor control signal to the rotation control unit, and when the supply switching unit supplies a power supply voltage to the storage unit, the comparison unit To the signal switching unit, and when the signal switching unit receives the effect from the comparison unit, the input motor control signal is rewritten to the information stored in the storage unit. The information may be transmitted to the information rewriting unit as new information.

  As a result, when the supply destination of the power supply voltage is switched to the information rewriting unit, the input / output destination of the terminal that is inputting / outputting the motor control signal at the time of driving the motor is switched from the rotation control unit to the storage unit. Writing becomes possible. Accordingly, since it is not necessary to provide a terminal for writing information, the motor drive device can be reduced in size.

  Further, the predetermined voltage threshold is a voltage value at the time of rewriting the storage unit by the information rewriting unit, and the comparison unit is configured such that the power supply voltage measured by the voltage measuring unit matches the voltage value at the time of rewriting. In some cases, the supply switching unit may be instructed to supply a power supply voltage to the storage unit. As a result, the supply switching unit supplies the power supply voltage to the information rewriting unit and changes the state of the storage unit to a writable state by applying the power supply voltage to the motor drive device with the magnitude of the power supply voltage being applied. Thus, information can be written.

  Accordingly, since it is not necessary to provide a terminal for supplying a write voltage to the motor driving device, the motor driving device can be reduced in size.

  The information may be a program executed by the rotation control unit and / or a parameter for controlling the rotation of the DC motor.

  As a result, it is possible to freely select the rotation control of the DC motor equipped with the motor driving device by writing the information. Therefore, the control of the rotation of the DC motor desired by the user can be realized.

  The DC motor may include a stator and a rotor, and may be molded with a thermosetting resin together with the stator. This makes it possible to write the information even in the molded DC motor in which it is difficult to provide a terminal for supplying a write voltage.

  Therefore, even in the above-described molded DC motor having high environmental resistance, the rotation control of the molded DC motor desired by the user can be realized by writing the information.

  Moreover, you may set it as the structure provided with said motor drive device, DC motor, and the air blower provided with the blade | wing connected to the said DC motor and ventilating by rotation.

  Thereby, it becomes possible for the user to freely select the rotation control of the blade connected to the DC motor and blowing air by rotation. Therefore, it is possible to realize a blower that blows air desired by the user.

  The motor driving device according to the present invention is useful as a driving device for a motor that requires downsizing because information can be written without providing a terminal for writing voltage.

DESCRIPTION OF SYMBOLS 1 Motor drive device 2 Brushless DC motor 3 Stator 4 Winding 5 Rotor 6 Power supply voltage 7 Control voltage 8 EEPROM
DESCRIPTION OF SYMBOLS 9 Memory | storage part 10 Information rewriting part 11 Rotation control part 12 Supply switching part 13 Voltage measurement part 14 Comparison part 15 Signal switching part 16 Inverter circuit 17 Speed command signal 18 Speed output signal 19a Voltage dividing resistor A
19b Voltage divider resistor B
19c Voltage divider resistor C
20a Grand A
20b Grand B
21 Comparator A
22 Comparator B
23 Pull-up resistor 24 Switch A
25 Switch B
26 Switch C
27 Ventilation fan embedded in ceiling 28 Duct 29 Exhaust vent

Claims (8)

A storage unit for storing information for rotating the DC motor;
A rotation control unit that controls the rotation of the DC motor based on the input motor control signal and the information acquired from the storage unit;
A voltage measuring unit for measuring the supplied power supply voltage;
A comparison unit that compares the power supply voltage measured by the voltage measurement unit with a predetermined voltage threshold;
A supply switching unit that switches the supply destination of the supplied power supply voltage to the DC motor or the storage unit based on the comparison result of the comparison unit; and
A motor driving device comprising: an information rewriting unit that rewrites information stored in the storage unit to new information using a power supply voltage supplied via the supply switching unit. A signal switching unit that receives the input motor control signal and transmits the received motor control signal to the rotation control unit;
The comparison unit includes:
When the supply switching unit supplies the power supply voltage to the storage unit, the fact is transmitted to the signal switching unit,
The signal switching unit is
The said motor control signal is transmitted to the said information rewriting part as said new information for rewriting the said information memorize | stored in the said memory | storage part when the said effect is received from the said comparison part. Motor drive device. The predetermined voltage threshold is:
The voltage value at the time of rewriting the storage unit by the information rewriting unit,
The comparison unit includes:
3. The motor drive device according to claim 1, wherein when the power supply voltage measured by the voltage measurement unit coincides with the voltage value at the time of the rewriting, the supply switching unit is instructed to supply the power supply voltage to the storage unit. The predetermined voltage threshold is:
The voltage value at the time of rewriting the storage unit by the information rewriting unit,
The comparison unit includes:
3. The motor drive device according to claim 1, wherein when the power supply voltage measured by the voltage measurement unit is equal to or lower than the voltage value at the time of rewriting, the supply switching unit is instructed to supply the power supply voltage to the storage unit. The rotation control unit
5. The motor driving device according to claim 1, wherein the motor driving device is driven by being supplied with electric power different from a power supply voltage measured by the voltage measuring unit. The information is
The motor drive device according to any one of claims 1 to 5, wherein the motor drive device is a program executed by the rotation control unit and / or a parameter for controlling rotation of the DC motor. The DC motor is
A stator and a rotor,
The motor driving device according to claim 1, wherein the motor driving device is molded with a thermosetting resin together with the stator. A motor driving device according to any one of claims 1 to 7;
A DC motor;
And a blade that is connected to the DC motor and blows air by rotation.