JP2019165895A - Motor drive device - Google Patents

Abstract

An object of the present invention is to provide a motor drive device that can be reduced in size while suppressing a decrease in work efficiency in a manufacturing process. A motor driving device includes a main body and a battery pack. The battery pack 12 is connected to the main body 11. The main body 11 includes a motor 1, a drive board 2, a controller board 3, and a motor case 10. The drive board 2 is arranged so as to face the motor 1 in a direction along the rotation axis 1a of the motor 1. The controller board 3 is arranged at an interval from the drive board 2. In the connection between the main body 11 and the battery pack 12, the main body 11 includes a first connector 32a. The main body 11 includes a wiring 33 that connects the first connector 32a to the drive board 2. The battery pack 12 is disposed so as to face the main body 11 from a direction intersecting with the rotation shaft 1 a of the motor 1. The wiring 33 is arranged in a region between the drive board 2 and the controller board 3. [Selection diagram] FIG.

Description

  The present invention relates to a motor drive device, and more particularly to a motor drive device that drives a battery as a power source.

  Conventionally, a battery-driven cleaner is known as an example of a motor driving device that drives a battery as a power source (see, for example, Japanese Patent Application Laid-Open Nos. 2017-205574 and 2017-000393). In Japanese Patent Application Laid-Open No. 2017-205673, a motor housing, a grip housing connected to the rear part of the motor housing, a dust collecting housing connected to the front part of the motor housing, and a battery holding housing connected to the grip housing are provided. A cleaner to provide is disclosed. In JP 2017-0003393 A, in a cleaner, L-shaped first and second substrate holding plate portions that are parallel to the motor axial direction of the electric blower and surround the electric blower from the side surface are fixed to the electric blower. A structure is disclosed.

JP 2017-205664 A JP 2017-000393 A

  In the motor drive device such as the above-described cleaner, downsizing of the device is required. For this reason, it is necessary to reduce the size of the motor, the drive board for controlling the motor, and the controller board, or reduce the size of the entire apparatus by optimizing the arrangement of the battery and the motor. .

  On the other hand, when the motor device is further reduced in size, when the motor drive device is assembled, wiring work inside the device housing becomes difficult, and work efficiency in the manufacturing process may be reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor drive device that can be miniaturized while suppressing a decrease in work efficiency in the manufacturing process. .

  The motor drive device according to the present disclosure includes a main body portion and a battery pack. The battery pack is connected to the main body. The main body includes a motor, a drive board, a controller board, and a motor case. The motor has a rotating shaft. The drive board is arranged to face the motor in a direction along the rotation axis. The controller board is located on the side opposite to the motor when viewed from the drive board, and is arranged at a distance from the drive board. The motor case holds the motor, the drive board, and the controller board inside. In the connection portion between the main body portion and the battery pack, the main body portion includes a first connector, and the battery pack includes a second connector connected to the first connector. The main body includes wiring that connects the first connector and the drive board. The battery pack is disposed so as to face the main body from a direction intersecting the rotation axis of the motor. The wiring is arranged in a region between the drive board and the controller board.

  According to the above, the substrate used for the control of the motor drive device is divided into the drive substrate and the controller substrate, and the wiring is arranged in the region between the drive substrate and the controller substrate. A motor drive device that can be reduced in size while suppressing a decrease in efficiency is obtained.

It is a block diagram for demonstrating the structure of a motor drive device. It is a perspective schematic diagram which shows arrangement | positioning of the component of a motor drive device. It is a cross-sectional schematic diagram of a motor drive device. It is a disassembled perspective schematic diagram of a motor drive device. It is a cross-sectional schematic diagram which shows the specific structural example of a motor drive device. It is a cross-sectional schematic diagram which shows the modification of a motor drive device. It is a schematic diagram which shows the cordless cleaner which is an example of a motor drive device. FIG. 8 is a partial cross-sectional schematic diagram of the cordless cleaner shown in FIG. 7.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

<Configuration of motor drive device>
FIG. 1 is a block diagram for explaining the configuration of the motor drive device 100. FIG. 2 is a schematic perspective view showing the arrangement of components of the motor drive device 100. FIG. 3 is a schematic cross-sectional view of the motor drive device 100. FIG. 4 is an exploded perspective schematic view of the motor driving device 100. FIG. 5 is a schematic cross-sectional view illustrating a specific configuration example of the motor driving device 100. Hereinafter, the motor drive device 100 according to the present embodiment will be described with reference to FIGS.

  First, a basic configuration of the motor driving apparatus 100 according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the motor drive device 100 is a motor drive device 100 that drives a battery 5 as a power source, and includes a motor 1, a drive board 2, a controller board 3, a battery 5, and a battery protection board 4. With. The battery 5 and the battery protection substrate 4 constitute a battery pack 12. The motor 1, the drive board 2, and the controller board 3 constitute a main body 11. The drive substrate 2 includes a drive circuit 2b, a position sensor 41, and a correction data holding device 2a. The controller board 3 includes a charging circuit 3a and a motor control circuit 3b.

  The drive board 2 is a board on which a drive circuit 2b that inputs and outputs at least a power supply current for controlling the motor 1 is mounted. The controller board 3 is a board on which at least a motor control circuit 3b is mounted.

  The motor 1 and the position sensor 41 are connected to the drive circuit 2b. The drive circuit 2 b is connected to the battery 5 via the battery protection board 4. The drive circuit 2 b is connected to the motor control circuit 3 b of the controller board 3 through the power supply line 61 and the signal line 62. The correction data holding device 2 a of the drive board 2 is connected to the motor control circuit 3 b of the controller board 3. The motor control circuit 3b is connected to the charging circuit 3a.

  In order to drive the motor 1, a drive substrate 2 for commutating motor current is connected to the motor 1. The drive circuit 2b mounted on the drive substrate 2 is a circuit for commutating the motor current. In order to determine the commutation timing of the motor current in the drive circuit 2b, a position sensor 41 that detects the rotation of the rotor in the motor 1 is necessary. Usually, the position sensor 41 is arranged in the motor 1.

  At this time, if the drive board 2 is fixed to the motor 1 as will be described later, the position sensor 41 can be disposed inside the motor 1 in a state of being mounted on the drive board 2. Although any method can be used for fixing the motor 1 and the drive substrate 2, for example, a method such as soldering the drive substrate 2 directly to the terminal of the motor 1 can be adopted.

  In the step of arranging the position sensor 41 inside the motor 1, there may be variations in the arrangement position of the position sensor 41. This variation is detected as a deviation of the rotor position when the motor 1 is driven. The deviation in the rotor position causes a deviation in the commutation timing of the motor current. As a result, in the control of the motor 1, there is an effect that the rotation speed of the motor 1 or the output of the motor 1 deviates from the setting.

  In order to correct this rotor position shift, the correction data holding device 2 a is mounted on the drive substrate 2. Data measurement for correcting the displacement of the arrangement position of the position sensor 41 is performed in an adjustment process when the motor driving device 100 is assembled. In the adjustment step, the motor 1 is actually driven to generate correction data used to correct the deviation from the rotor speed of the motor 1 (hereinafter also referred to as motor speed) and the motor output, and the data is corrected. The data is stored in the data holding device 2a.

  The stored correction data is read and used by the motor control circuit 3b on the controller board 3 when the motor 1 is next driven. Many microcomputers are used for the motor control circuit 3b. When the motor control circuit 3b corrects the commutation timing based on the rotational position information when the motor 1 is driven, the correction data is processed by the motor control circuit 3b. As a result, the motor rotation speed and motor output of the motor 1 can be accurately controlled with the set values using the correction data.

  As the correction data holding device 2a, for example, an EEPROM (Electrically Erasable Programmable Read-Only Memory) can be used. By mounting the EEPROM as the correction data holding device 2a on the driving substrate 2, correction data suitable for the motor 1 can be obtained from the correction data holding device 2a at any stage after the motor 1 and the driving substrate 2 are fixed. . In other words, if the controller board 3 can be used for control by reading the correction data from the outside, it is set by reading the correction data from the driving board 2 in combination with the motor 1 combined with the driving board 2 as described above. The motor 1 can be accurately controlled so that the motor speed and the motor output are obtained. The correction data can be acquired in a state where the drive board 2 is fixed to the motor 1, and the adjustment as to the correction data can be performed before the controller board 3 is assembled. Thus, the above effects can be obtained.

  The controller board 3 and the drive board 2 are connected by a signal line 62 that transmits a control signal and a power line 61 that supplies a control power. A motor current commutation timing signal, a position sensor signal, and data for correcting misalignment are transmitted and received through the signal line 62, and a current for driving the motor control circuit 3 b is supplied to the motor control circuit via the power line 61. To 3b.

  Further, the charging circuit 3 a mounted on the controller board 3 controls the charging current when the battery 5 is charged. The charging current is input to the battery protection board 4 and the battery 5 through the driving board 2. At this time, the charging current is input to the controller board 3 from the outside of the motor driving device 100. For this reason, the charging circuit 3a can be driven using the charging current input from the outside. Therefore, the power supply line 61 can be used for the conduction of the charging current from the charging circuit 3a to the battery 5. That is, it is not necessary to arrange an independent wiring for charging the battery 5. As a result, the wiring dedicated to charging between the charging circuit 3a, the battery protection board 4 and the battery 5 can be omitted, and the number of components of the motor driving device 100 can be reduced. The battery protection board 4 connected to the battery 5 has a function of cutting off the external connection to the battery 5 when the battery 5 is overcharged or overdischarged.

  A drive current for driving the motor 1 is output from the battery protection substrate 4 and the battery 5. The drive current increases in proportion to the motor output. Therefore, the wiring 33 (see FIG. 3), which is a drive power supply cable for a drive power supply for inputting the drive current to the drive circuit 2b, also needs to be thickened in proportion to the value of the drive current. On the other hand, the signal line 62 that is a control cable for the control signal has a small value of energization current, and a cable that is thinner than the wiring 33 that is the drive power cable can be used.

  The power supply current of the motor control circuit 3 b is supplied from the battery 5 via the drive substrate 2. Here, in order to supply the power supply current directly from the battery 5 to the motor control circuit 3b, it is necessary to add a connection terminal for connecting to the motor control circuit 3b to the battery pack 12. However, with the above-described configuration, it is not necessary to add a connection terminal for connecting to the motor control circuit 3b to the battery pack 12. That is, the number of connection terminals in the battery pack 12 that can be attached to and detached from the main body 11 can be reduced.

  Here, in the power supply line 61 which is a control power supply cable for supplying the power supply current of the motor control circuit 3 b, the value of the energization current is smaller than the value of the drive current flowing through the wiring 33. That is, the drive current has the largest value among the currents flowing through the cable in the motor drive device 100, and the cable diameter of the wiring 33 through which the drive current flows is relatively thick. About such a thick cable, the force required for the cable connection at the time of the assembly of the motor drive device 100 becomes large. For this reason, it is necessary to ensure a relatively wide space as a space for performing cable connection work. Moreover, it is necessary to lengthen the surplus length of the cable, and it is also necessary to secure a space in which the surplus length of the cable can be bent and stored. In the motor drive device 100 according to the present embodiment, a relatively large space is secured between the drive board 2 and the controller board 3 as an area for arranging the wiring 33 as described later.

  The temperature of the battery 5 is monitored by the motor control circuit 3b and controlled so that the battery 5 can be used in a safe temperature range. As described above, the battery temperature signal line 34 (see FIG. 5), which is a cable for transmitting the temperature data of the battery 5, can be a relatively thin cable because a large current such as a drive current does not flow.

  The arrangement of each device in the motor drive device 100 will be described with reference to FIG. A drive board 2 for driving the motor 1 is attached so as to be fixed to the motor 1. Although any method can be used as a method of fixing the drive substrate 2 to the motor 1, for example, a fixing method by soldering can be used. Further, as the fixing method, a fixing method such as a screw or caulking may be used.

  A position sensor 41 is mounted on the drive substrate 2. The position sensor 41 is inserted to the inside of the motor 1 to detect the rotor position inside the motor 1. As the position sensor 41, for example, an IC with a lead may be used, and the IC as the position sensor 41 may be inserted into the motor 1 by adjusting the length of the lead. Alternatively, a chip IC as the position sensor 41 may be mounted on a board having a width that can be inserted into the motor 1, and the board may be inserted into the motor 1. It is preferable that the drive substrate 2 be arranged in a direction perpendicular to the rotating shaft 1a of the motor 1 regardless of whether the IC with a lead is mounted as the position sensor 41 or the chip IC is mounted as described above. . If it does in this way, in the surface of the drive board | substrate 2, the fixing | fixed part with the motor 1 can be formed in several places arrange | positioned mutually spaced apart. As a result, the drive substrate 2 can be easily fixed to the motor 1. In this manner, the drive substrate 2 can be fixed to the motor 1 with the position sensor 41 mounted on the drive substrate 2.

  The controller board 3 is arranged in parallel with the driving board 2. The controller board 3 is arranged at an interval in the extending direction of the drive board 2 and the rotating shaft 1 a of the motor 1. In the motor drive device 100 according to this embodiment, the controller board 3 and the drive board 2 are divided into two boards, which are arranged side by side. As a result, an effect of reducing the size (for example, width) of the motor driving device 100 can be obtained as compared with the case where the substrates are not separated. The controller board 3 and the drive board 2 may have the same board area, or the two board areas may be different. It is possible to add a function to the controller board 3 so that only the board area of the controller board 3 is relatively large. Further, the two substrates may be arranged so as to cross each other, instead of being arranged in parallel. For example, the controller board 3 may be disposed obliquely with respect to the drive board 2. That is, the controller board 3 may be disposed so as to cross obliquely with respect to the rotating shaft 1 a of the motor 1.

  In a state where the battery pack 12 (see FIG. 1) is connected to the main body 11 (see FIG. 1), the battery protection board 4 is arranged on an extension line of one board plane of the controller board 3 as shown in FIG. May be. Alternatively, the direction of the battery protection board 4 may be the same as in the configuration shown in FIG. 2, and the battery protection board 4 may be arranged at a position shifted from the extension line of one board plane of the controller board 3. The shape of the battery 5 is a columnar shape or a plate shape having a longitudinal direction and a lateral direction. The battery protection board 4 is connected to the battery 5. As shown in FIG. 2, the battery protection board 4 and the battery 5 may be arranged such that the end face in the longitudinal direction of the battery 5 faces the main surface of the battery protection board 4. The longitudinal direction of the battery 5 may be parallel to the motor 1 rotation shaft 1a. Further, as shown in FIG. 2, the battery 5 preferably faces the side surface of the motor 1 and is arranged in parallel with the rotation shaft 1 a of the motor 1. In this way, the shape of the motor drive device 100 using the battery 5 as a power source can be made into a single united shape with a small structure and a few protruding portions.

  An example of a specific configuration of the motor drive device 100 will be described with reference to FIGS. 3 and 4. The motor drive device 100 includes a main body 11 and a battery pack 12. The battery pack 12 is connected to the main body 11. The main body 11 mainly includes the motor 1, the drive board 2, the controller board 3, the motor case 10, the vibration suppression component 50, the first connector 32 a, and the wiring 33. The motor 1 has a rotating shaft 1a. The drive substrate 2 is disposed so as to face the motor 1 in the direction along the rotation shaft 1a. That is, the drive substrate 2 is disposed so as to face the end surface of the motor 1 extending in a direction intersecting with the rotation shaft 1a of the motor 1. A drive circuit 2b, a position sensor 41, and a correction data holding device 2a are mounted on the drive board 2 as shown in FIG.

  The motor 1 is attached to the motor case 10 via a vibration suppression component 50. The vibration suppression component 50 is a component having an effect of reducing the vibration of the motor 1 transmitted to the motor case 10. As the configuration of the vibration suppression component 50, any configuration can be adopted. For example, an elastic body such as rubber or resin can be used as the vibration suppressing component 50.

  The controller board 3 is located on the side opposite to the motor 1 when viewed from the drive board 2. The controller board 3 has a main surface facing the drive board 2 and is spaced from the drive board 2. The controller board 3 is connected to the motor case 10. A motor control circuit 3b and a charging circuit 3a are mounted on the controller board 3 as shown in FIG. The motor case 10 holds the motor 1, the drive board 2, and the controller board 3 inside.

  As shown in FIG. 2, the drive substrate 2 is fixed to the motor 1. As described above, the controller board 3 is connected to the motor case 10. The motor 1 is connected to the motor case 10 via a vibration suppression component 50. Thereby, the vibration of the motor 1 is not directly transmitted to the controller board 3. For example, an LED is arranged on the controller board 3, and an LED guide is arranged so as to face the LED and continue to the outside of the motor case 10. If it does in this way, the display content of LED can be displayed toward the exterior of motor case 10 through an LED guide. In this case, by suppressing the vibration transmitted to the controller board 3 by using the above configuration, it is possible to suppress the occurrence of a problem that the display of the LED is blurred due to the vibration and is difficult to see.

  The battery pack 12 mainly includes a battery 5, a battery protection board 4, a battery case 20, and a second connector 35. The battery case 20 holds the battery 5 and the battery protection board 4 inside. In the connection portion between the main body portion 11 and the battery pack 12, a first connector 32 a is installed in the motor case 10 of the main body portion 11. A battery connector 20 of the battery pack 12 is provided with a second connector 35 connected to the first connector 32a. The second connector 35 is mounted on the battery protection substrate 4 and is partially exposed to the outside from the opening of the battery case 20. With the battery pack 12 connected to the main body 11, the first connector 32a and the second connector 35 are connected. The battery 5 supplies a power supply current to the drive circuit 2b (see FIG. 1) of the drive board 2 and the motor 1 through the battery protection board 4, the second connector 35, the first connector 32a, the wiring 33, and the connector 32b. Any configuration can be adopted as long as the first connector 32a and the second connector 35 are detachable. For example, one of the first connector 32a and the second connector 35 may be a male connection terminal and the other may be a female connection terminal.

  In the main body 11, the first connector 32 a and the connector 32 b of the drive board 2 are connected by the wiring 33. The wiring 33 has a length that is sufficiently longer than the distance between the first connector 32a and the connector 32b, and is accommodated in a bent state in the space between the drive board 2 and the controller board 3. The controller board 3 is connected to the second connector 35 by a battery temperature signal line 34. The battery temperature signal line 34 connects the motor control circuit 3b (see FIG. 1) of the controller board 3 to the second connector 35. The battery pack 12 is disposed so as to face the main body 11 from a direction intersecting the rotation shaft 1 a of the motor 1.

  As shown in FIG. 4, the motor case 10 has such a shape that the battery case 20 is combined. For example, the motor case 10 has a fitting portion 63 as shown in FIG. In the battery pack 12, the battery pack 12 is connected to the main body portion 11 so that the convex portion on which the battery protection substrate 4 (see FIG. 3) is disposed is fitted into the fitting portion 63. The motor case 10 and the battery case 20 are arranged such that their longitudinal methods are arranged in parallel to each other. The battery pack 12 is configured to be detachable from the main body 11. Any method can be adopted as a method of fixing the battery pack 12 to the main body 11. For example, a configuration is adopted in which a concave portion and a claw portion that can be inserted into the concave portion are formed on opposite surfaces of the battery pack 12 and the main body portion 11, and the claw portion is inserted and fixed inside the concave portion. May be. In addition, the battery pack 12 and the main body 11 may be fixed to each other using a connection portion between the first connector 32a and the second connector 35.

  A specific configuration example of the motor drive device 100 according to the present embodiment will be described with reference to FIG. The motor drive device shown in FIG. 5 basically has the same configuration as that of the motor drive device shown in FIG. 3, except that a capacitor 31 is mounted on the drive substrate 2. Different from the device. In the motor drive device shown in FIG. 5, the capacitor 31 is arranged on the drive substrate 2 as described above. The capacitor 31 is mounted on the drive circuit 2 b of the drive substrate 2 in order to smooth the current amplitude when the motor 1 is driven. The capacitor 31 is a component having a height so as to protrude from the surface of the drive substrate 2. For this reason, the capacitor 31 is also disposed in the space between the controller board 3 and the drive board 2 in the same manner as the wiring 33. Further, the capacitor 31 is arranged on the surface of the drive substrate 2 opposite to the side facing the battery pack 12, that is, the region opposite to the region where the first connector 32 a is formed in the motor case 10. As a result, it is possible to prevent the capacitor 31 from becoming an obstacle during the operation of connecting the wiring 33 that is the drive power cable. Further, since the capacitor 31 is arranged near the end on the surface of the drive substrate 2, a wide space for arranging the wiring 33 as the drive power supply cable can be provided inside the motor case 10.

  Here, when assembling the main body 11, the wiring 33 that is a drive power cable is connected to the first connector 32 a and the connector 32 b of the drive board 2, and then the drive board 2 and the motor 1 are housed in the motor case 10. . For this reason, a wiring length for routing the wiring 33 is required, and an extra cable length is generated in the wiring 33. The space enclosed by the controller board 3 and the drive board 2 in the motor case 10 can be used as a space for storing the wiring 33 and the extra length of other control power cables and signal cables (not shown). .

  In the motor drive device shown in FIG. 5, the battery case 20 is arranged on the side surface of the motor case 10 as in the motor drive device shown in FIG. 3. The battery case is disposed in parallel to the rotation shaft 1 a of the motor 1. Thus, by disposing the motor 1 and the battery 5 close to each other, the distance between the battery 5 as the power source and the motor 1 as the driving device is shortened. For this reason, the length of the cable through which the drive current supplied to the motor 1 flows can be shortened, so that the loss due to the electrical resistance proportional to the length of the cable such as the wiring 33 can be reduced.

  Further, a battery temperature signal line 34 for transmitting temperature data obtained by measuring the temperature of the battery 5 to the controller board 3 connects the first connector 32 a and the controller board 3. The battery temperature signal line 34 is electrically connected to the motor control circuit 3b (see FIG. 1) of the controller board 3. The temperature data of the battery 5 measured in the battery pack 12 is transmitted to the motor control circuit 3b via the battery protection board 4, the second connector 35, the first connector 32a, and the battery temperature signal line 34. By wiring the relatively thin battery temperature signal line 34 separately from the wiring 33 which is a relatively thick drive power supply cable, the influence of noise from the wiring 33 can be reduced. Thus, the drive of the motor 1 and the charging of the battery 5 can be controlled by the controller board 3 so that the battery 5 can be used in a safe battery temperature region.

<Effect>
The motor drive device according to the present disclosure includes a main body portion 11 and a battery pack 12. The battery pack 12 is connected to the main body 11. The main body 11 includes a motor 1, a drive board 2, a controller board 3, and a motor case 10. The motor 1 has a rotating shaft 1a. The drive substrate 2 is disposed so as to face the motor 1 in the direction along the rotation shaft 1a. The controller board 3 is located on the opposite side of the motor 1 when viewed from the driving board 2 and is arranged at a distance from the driving board 2. The motor case 10 holds the motor 1, the drive board 2, and the controller board 3 inside. In the connection part between the main body part 11 and the battery pack 12, the main body part 11 includes a first connector 32a, and the battery pack 12 includes a second connector 35 connected to the first connector 32a. The main body 11 includes a wiring 33 that connects the first connector 32 a and the drive substrate 2. The battery pack 12 is disposed so as to face the main body 11 from a direction intersecting the rotation shaft 1 a of the motor 1. The wiring 33 is disposed in a region between the drive board 2 and the controller board 3.

  In this way, by dividing the substrate in the motor drive device into the drive substrate 2 and the controller substrate 3, the size of each substrate is reduced and the degree of freedom of arrangement of the substrate is increased. As a result, the motor drive device Can be miniaturized. In addition, since a sufficiently large space can be formed in the region between the drive board 2 and the controller board 3, the step of connecting the wiring 33 to the drive board 2 can be efficiently performed in the space in the manufacturing process of the motor drive device. Can do. That is, the workability in the manufacturing process of the motor drive device can be kept good. Further, since the controller board 3 is separated from the motor 1, it is possible to suppress the vibration of the motor 1 from being transmitted to the controller board 3.

  In the motor drive device, the drive substrate 2 has a capacitor 31 mounted on the surface facing the controller substrate 3 in a region opposite to the end on the first connector 32a side. The first connector 32 a is disposed so as to be exposed at the surface portion 10 b that is a part of the inner wall of the fitting portion 63 that is a recess of the motor case 10. The inner wall of the fitting portion 63 includes the surface portion 10b and a surface portion 10c that is continuous with the surface portion 10b and extends in a direction different from the surface portion 10b. The wiring 33 is disposed in a region surrounded by the drive substrate 2, the capacitor 31, and the controller substrate 3.

  In this case, the volume of the region 10a in which the wiring 33 can be arranged can be increased as compared with the case where the capacitor 31 is mounted on the end portion on the first connector 32a side in the drive substrate 2. For this reason, since the size of an area that can be used as a work space when connecting the wiring 33 to the drive board 2 can be sufficiently increased, workability in the manufacturing process of the motor drive device is improved when the capacitor 31 is mounted on the drive board 2. Can be kept in.

  In the motor drive device, the battery pack 12 includes a battery 5, a battery protection board 4, and a battery case 20. The battery case 20 holds the battery 5 and the battery protection board 4 inside. In the battery pack 12, the battery protection board 4 is arranged so that the main surface of the battery protection board 4 extends in a direction intersecting the rotating shaft 1 a of the motor 1. In this case, the exclusive length of the battery protection substrate 4 in the direction along the rotation shaft 1a can be made smaller than when the battery protection substrate 4 is arranged so as to extend in parallel with the rotation shaft 1a of the motor 1.

  In the motor driving apparatus, the controller board 3 is electrically connected to the driving board 2 and supplied with power from the driving board 2. The controller board 3 includes a charging circuit 3 a that charges the battery pack 12 via the drive board 2. Specifically, the charging circuit 3 a charges the battery 5 of the battery pack 12.

  In this case, the number of wires in the motor drive device can be reduced as compared with the case where wires for directly connecting the controller board 3 to the battery pack 12 are installed.

<Configuration and operation effect of modified example of motor driving device>
FIG. 6 is a schematic cross-sectional view showing a modified example of the motor drive device. The motor drive device shown in FIG. 6 basically has the same configuration as the motor drive device shown in FIGS. 1 to 5 except that the arrangement of the battery protection board 4 in the battery pack 12 and the shape of the battery pack 12 are the same. This is different from the motor driving apparatus shown in FIGS. Specifically, in the motor drive device shown in FIG. 6, the battery protection board 4 is arranged in the battery pack 12 so that the main surface of the battery protection board 4 extends in the direction along the rotation axis 1 a of the motor 1. ing. In this case, the exclusive length of the battery protection board 4 in the direction intersecting the rotation axis 1a is larger than that in the case where the battery protection board 4 extends in the direction intersecting the rotation axis 1a of the motor 1. Can be small.

  From a different point of view, in the motor driving device shown in FIG. 6, the battery protection board 4 is arranged in parallel to the longitudinal direction of the battery 5 as an arrangement for attaching the battery protection board 4 and the battery 5 to the battery case 20. . Also in this embodiment, as compared with the configuration shown in FIG. 5, the battery case 20 is moved and arranged in a direction parallel to the rotation shaft 1 a of the motor 1 in a direction away from the motor 1. It can be arranged adjacent to the motor case 10. Also in the configuration shown in FIG. 6, it is possible to secure a sufficient area 10 a in which the wiring 33 that is a power cable in the motor case 10 is arranged.

  About the controller board 3, you may arrange | position the controller board 3 diagonally with respect to the surface of the drive board | substrate 2 according to the height of the capacitor | condenser 31, and arrangement | positioning and shape of the battery case 20. FIG. Even in this case, a sufficient area 10a for arranging the wiring 33 and the like can be secured, and the motor driving device can be downsized.

  1 to 6, the controller board 3 is provided with an external signal input terminal and an external connection terminal necessary for charging. It is also conceivable to perform arithmetic processing in a circuit mounted on the controller board 3. In the motor driving apparatus shown in FIGS. 1 to 6, vibration caused by driving of the motor 1 is not directly transmitted to the controller board 3. The possibility of the vibrations affecting the input of the electric power) can be reduced.

<Configuration and effect of cordless cleaner>
FIG. 7 is a schematic diagram showing a cordless cleaner which is an example of a motor driving device. FIG. 8 is a schematic partial sectional view of the cordless cleaner shown in FIG.

  The cordless cleaner 100 shown in FIGS. 7 and 8 includes a dust collecting portion 51 disposed on the front end side of the motor case 10 in the motor drive device according to the present embodiment, and an extension pipe 54 connected to the dust collecting portion 51. The suction tool 55 is connected to the tip of the extension pipe 54, and the grip 53 is installed on the opposite side of the tip of the motor case 10 to which the dust collecting part 51 is connected. On the front end side of the motor case 10, a blade for generating an airflow is connected to the rotating shaft of the motor 1. The structure of the dust collection part 51 can employ | adopt arbitrary structures, For example, it is good also as a structure containing a paper pack, or a cyclone box structure. Further, the grip portion 53 may have any configuration, but may be disposed so as to connect the motor case 10 and the battery case 20, for example.

  The internal configuration of the motor case 10 and the internal configuration of the battery case 20 that constitute the cordless cleaner 100 according to the present embodiment are basically the same as those of the motor drive device shown in FIGS. However, in the motor drive device constituting the cordless cleaner 100, as shown in FIG. 8, the controller board 3 has an acceleration sensor 56, and the motor case 10 has a hole 52 formed on the surface facing the battery pack 12. This is different from the motor driving apparatus shown in FIGS. In the motor drive device as the cordless cleaner shown in FIG. 8, the controller board 3 is configured to control the operation of the motor 1 in accordance with the output of the acceleration sensor 56.

  In this case, the output from the acceleration sensor 56 can be used for controlling the motor 1. For example, it is possible to control whether or not the motor drive device is moved by the acceleration sensor 56 based on the acceleration, and the motor 1 is driven only when the motor drive device is moved according to the measurement result of the acceleration. Become. That is, by mounting the acceleration sensor 56 on the controller board 3, it is possible to perform control such that the motor 1 is driven only when the cordless cleaner 100 is used. The movement using the cordless cleaner 100 appears in the acceleration with respect to the main body 11 of the cordless cleaner 100. Therefore, it is possible to determine whether or not the cordless cleaner 100 is used by detecting the change in the acceleration. At this time, since the vibration of the motor 1 is not directly transmitted to the controller board 3, it is possible to reduce the probability of occurrence of a problem such that the acceleration sensor 56 detects unnecessary acceleration due to the vibration of the motor 1.

  Further, in the cordless cleaner 100, as shown in FIG. 8, the motor case 10 has a hole 52 formed on the surface facing the battery pack 12. The hole 52 may be formed in a region between the motor 1 and the drive substrate 2 in the main body 11 in the direction along the rotation axis 1 a of the motor 1. In this case, the airflow generated by driving the motor 1 from the hole 52 can be directed toward the battery pack 12. As a result, the battery pack 12 can be cooled by the airflow.

  Further, in the cordless cleaner 100 shown in FIG. 7, the grip portion 53 grips a portion close to the battery pack 12 (see FIG. 8) and the main body portion 11 (see FIG. 8), thereby applying a load to the gripping hand. A reduction effect is obtained. This is an effect obtained by placing a heavy object in a portion close to the hand.

  If a single-phase motor is applied as the motor 1, the number of commutation elements constituting the drive circuit 2b (see FIG. 1) is changed from 6 to 4 as compared with the case where a three-phase motor is applied as the motor 1. Can be reduced. That is, the configuration of the drive circuit 2b can be simplified. As a result, the motor drive device and the cordless cleaner 100 can be reduced in size.

  As shown in FIG. 8, the airflow generated by the blades attached to the motor 1 is discharged to the outside of the motor case 10 through the holes 52 formed in the motor case 10. The dust can be sucked into the dust collecting portion 51 through the extension pipe 54. As a result, the motor drive device according to the present embodiment can function as a vacuum cleaner.

  Moreover, it is preferable to provide the hole 52 of the motor case 10 on the battery 5 side as shown in FIG. At this time, the wind from the motor 1 is blown to the battery pack 12 through the hole 52. Then, the battery pack 12 is cooled by the airflow. By arranging the battery case 20 and the battery 5 in close contact with each other in the battery pack 12, the battery 5 can be efficiently cooled by the airflow from the motor 1. As a result, there is an effect of reducing the temperature rise of the battery 5.

  In the above-described embodiment, the configuration in which the battery pack 12 is detachable from the main body portion 11 has been described. However, the main body portion 11 and the battery pack 12 may be integrated. For example, the battery 5 and the battery protection board 4 may be installed inside the motor case 10 of the main body 11.

  1 motor, 1a rotating shaft, 2 drive board, 2a correction data holding device, 2b drive circuit, 3 controller board, 3a charging circuit, 3b motor control circuit, 4 battery protection board, 5 battery, 10 motor case, 10a region, 10b , 10c Surface portion, 11 Body portion, 12 Battery pack, 20 Battery case, 31 Capacitor, 32a First connector, 32b connector, 33 Wiring, 34 Battery temperature signal line, 35 Second connector, 41 Position sensor, 50 Vibration suppression component , 51 Dust collecting part, 52 holes, 53 grip part, 54 extension pipe, 55 suction tool, 56 acceleration sensor, 61 power line, 62 signal line, 63 fitting part, 100 motor drive device.

Claims (7)

The main body,
A battery pack connected to the main body,
The body part is
A motor having a rotating shaft;
A drive board arranged to face the motor in a direction along the rotation axis;
A controller board positioned on the opposite side of the motor as viewed from the drive board and spaced from the drive board;
A motor case for holding the motor, the drive board, and the controller board inside,
In the connection portion between the main body portion and the battery pack, the main body portion includes a first connector, and the battery pack includes a second connector connected to the first connector,
The main body includes a wiring for connecting the first connector and the drive board,
The battery pack is disposed so as to face the main body portion from a direction intersecting the rotation axis of the motor,
The motor drive device, wherein the wiring is disposed in a region between the drive board and the controller board. The drive board has a capacitor mounted in a region opposite to the end on the first connector side on the surface facing the controller board;
The motor drive device according to claim 1, wherein the wiring is disposed in a region surrounded by the drive substrate, the capacitor, and the controller substrate. The battery pack is
Battery,
A battery protection board;
A battery case for holding the battery and the battery protection board inside,
3. The motor drive device according to claim 1, wherein in the battery pack, the battery protection board is arranged so that a main surface of the battery protection board extends in a direction intersecting the rotation axis of the motor. The battery pack is
Battery,
A battery protection board;
A battery case for holding the battery and the battery protection board inside,
3. The motor drive device according to claim 1, wherein in the battery pack, the battery protection board is arranged such that a main surface of the battery protection board extends in a direction along the rotation axis of the motor. The controller board is electrically connected to the drive board and is fed from the drive board,
The motor driving device according to claim 1, wherein the controller board includes a charging circuit that charges the battery pack via the driving board. The controller board has an acceleration sensor;
The motor controller according to claim 1, wherein the controller board is configured to control an operation of the motor in accordance with an output of the acceleration sensor. The motor driving device according to claim 1, wherein a hole is formed in a surface of the motor case facing the battery pack.

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