CN113646542A

CN113646542A - Electric blower, electric vacuum cleaner, and hand dryer

Info

Publication number: CN113646542A
Application number: CN201980094867.9A
Authority: CN
Inventors: 高山裕次; 松尾遥; 畠山和德; 清水裕一
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2019-04-11
Filing date: 2019-04-11
Publication date: 2021-11-12
Also published as: WO2020208790A1; EP3954903A4; JPWO2020208790A1; EP3954903A1; JP7086277B2

Abstract

The disclosed device is provided with: a blower motor unit (240) having a single-phase motor (220) in which blades (230) and blades (230) are mounted on a rotor (221); a substrate (210) on which a motor control device is mounted, the motor control device having an inverter that outputs AC power to the single-phase motor (220) and controlling the driving of the single-phase motor (220); and a frame body provided with a blower motor unit (240) and a substrate (210), wherein the substrate (210) is provided at a position where the air generated by the blower motor unit (240) is directly or indirectly cooled.

Description

Electric blower, electric vacuum cleaner, and hand dryer

Technical Field

The present invention relates to an electric blower, an electric vacuum cleaner, and a hand dryer equipped with a single-phase motor.

Background

Conventionally, as an example of an electric device provided with an electric blower, an electric vacuum cleaner, a hand dryer, and the like are known. Such electric devices are miniaturized to improve ease of transportation, operability during use, and the like. For example, patent document 1 discloses the following technique: in order to miniaturize an electric vacuum cleaner as an electric device and efficiently cool a control unit for controlling an electric blower, a substrate of the control unit is disposed in a flow path of an air flow in the electric blower.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2002-21794

Disclosure of Invention

Problems to be solved by the invention

However, the structure described in patent document 1 shows that the heat generating components of the circuit portion can be efficiently cooled, but does not mention cooling of other components constituting the product, and cannot obtain a cooling effect.

Further, an electric blower mounted on a stick-type electric vacuum cleaner or the like is reduced in size and weight to improve user convenience. In order to achieve miniaturization, an inverter for driving an electric blower is suitable for a single-phase inverter structure with reduced switching elements. In addition, the electric blower preferably uses a single-phase permanent magnet motor in accordance with a single-phase inverter. On the other hand, when the electric blower is downsized, the diameter of the blade mounted on the electric blower is reduced, and the output of the electric blower is reduced. Therefore, a control method of rotating the blades at a high speed in accordance with a decrease in the diameter of the blades is generally adopted. As such a control method, a method of performing control based on the rotor magnetic pole position by using a position sensor for determining the rotor magnetic pole position is used.

In this case, the position sensor detects the magnetic pole position by picking up the magnetic flux of the magnet, and therefore the rotor magnet has to be close to the position sensor, and it is necessary to mount the substrate on which the position sensor is mounted on the motor. Therefore, the electric blower has the following problems: since the base plate and the motor are integrated, the air passage is blocked by the base plate, and the pressure loss of the product is increased, thereby lowering the aerodynamic output. In addition, the electric blower has a problem of reducing cooling performance of components mounted on the rear stage of the substrate in the air passage.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain an electric blower that can efficiently cool a heat generating component and control driving of a single-phase motor in a compact size.

Means for solving the problems

In order to solve the above problems and achieve the object, an electric blower according to the present invention includes: a blower motor unit having a single-phase motor in which blades are attached to a rotor and blades; a substrate on which a motor control device is mounted, the motor control device having an inverter that outputs alternating-current power to a single-phase motor and controlling driving of the single-phase motor; and a frame body provided with a blower motor part and a substrate. The base plate is disposed at a position where the base plate is directly or indirectly cooled by wind generated by the blower motor portion.

Effects of the invention

The electric blower of the invention has the following effects: the heat generating component can be efficiently cooled with miniaturization, and the drive of the single-phase motor can be controlled.

Drawings

Fig. 1 is a diagram showing an external appearance of an electric blower according to embodiment 1.

Fig. 2 is a sectional view of a first example of the electric blower according to embodiment 1.

Fig. 3 is a side view of a first example of the electric blower according to embodiment 1.

Fig. 4 is a diagram showing a circuit configuration of a motor control device mounted on a substrate of embodiment 1.

Fig. 5 is a diagram showing a circuit configuration of an inverter provided in the motor control device according to embodiment 1.

Fig. 6 is a sectional view of a second example of the electric blower according to embodiment 1.

Fig. 7 is a side view of a second example of the electric blower according to embodiment 1.

Fig. 8 is a sectional view of a third example of the electric blower according to embodiment 1.

Fig. 9 is a sectional view of a fourth example of the electric blower according to embodiment 1.

Fig. 10 is a side view of a fourth example of the electric blower according to embodiment 1.

Fig. 11 is a sectional view of a first example of the electric blower according to embodiment 2.

Fig. 12 is a side view of a first example of the electric blower according to embodiment 2.

Fig. 13 is a sectional view of a second example of the electric blower according to embodiment 2.

Fig. 14 is a side view of a second example of the electric blower according to embodiment 2.

Fig. 15 is a sectional view of a third example of the electric blower according to embodiment 2.

Fig. 16 is a diagram showing a configuration example of an electric vacuum cleaner including an electric blower according to embodiment 3.

Fig. 17 is a diagram showing a configuration example of a hand dryer including an electric blower according to embodiment 3.

Detailed Description

Hereinafter, the electric blower, the electric vacuum cleaner, and the hand dryer according to the embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment.

Embodiment mode 1

Fig. 1 is a diagram showing an external appearance of an electric blower 100 according to embodiment 1 of the present invention. Fig. 1 is a diagram of the electric blower 100 viewed from a direction determined as an upper surface for convenience. The electric blower 100 is not limited to an orientation in actual use, and may be used with a lower surface, not shown, facing upward, for example. The electric blower 100 includes a cylindrical housing 200. The electric blower 100 includes a blower motor unit, not shown, and a board on which a motor control device for controlling the driving of a single-phase motor included in the blower motor unit is mounted, inside the cylindrical housing 200. Hereinafter, the internal structure of the electric blower 100 will be described specifically using a cross-sectional view of the electric blower 100 viewed from the a-a direction shown in fig. 1 and a side view of the electric blower 100 viewed from the right side with the top surface thereof being the upper direction shown in fig. 1.

Fig. 2 is a sectional view of a first example of the electric blower 100 according to embodiment 1. Fig. 3 is a side view of a first example of the electric blower 100 according to embodiment 1. As described above, the electric blower 100 includes the blower motor unit 240 and the substrate 210 inside the cylindrical housing 200. The blower motor unit 240 includes blades 230 and a single-phase motor 220 having the blades 230 attached to a rotor 221. A motor control device that controls driving of the single-phase motor 220 and has an inverter that outputs ac power to the single-phase motor 220 is mounted on the substrate 210. The single-phase motor 220 is connected to the substrate 210, i.e., the motor control device 10, via the

wires

211 and 212. The substrate 210 is provided to the cylindrical housing 200 via the support portion 213. The single-phase motor 220 is provided to the cylindrical housing 200 via the support portion 214. The

support portions

213 and 214 may be integrally formed with the cylindrical housing 200, or may be different from the cylindrical housing 200. The shape of the

support portions

213 and 214 may be a rod-like shape or a surface-like shape. The same applies to the subsequent support portions. The orientation of the substrate 210 is not particularly limited, and the substrate 210 may be provided so that the surface on which the heat generating component is mounted contacts the cylindrical housing 200 via a heat sink, not shown. That is, the cylindrical housing 200 can also be used as a heat sink.

Fig. 4 is a diagram showing a circuit configuration of the motor control device 10 mounted on the substrate 210 of embodiment 1. Fig. 5 is a diagram showing a circuit configuration of the inverter 11 provided in the motor control device 10 according to embodiment 1. As shown in fig. 4, the motor control device 10 is connected to a battery 202 and a single-phase motor 220. The battery 202 supplies dc power for driving the electric blower 100 to the base plate 210, i.e., the motor control device 10. The motor control device 10 controls the operation of the single-phase motor 220 to rotate the rotor 221 and the blades 230. The motor control device 10 includes an inverter 11, a current detection unit 20, a voltage detection unit 21, an analog-digital converter 30, a processor 31, and a drive signal generation unit 32.

The inverter 11 has switching elements 51 to 54, converts dc power supplied from the battery 202 into ac power, outputs the ac power to the single-phase motor 220, and drives the single-phase motor 220. The current detection unit 20 detects a current flowing through the single-phase motor 220. The voltage detection unit 21 detects the voltage of the ac power applied to the single-phase motor 220. The analog-digital converter 30 converts analog signals of the current value detected by the current detection unit 20 and the voltage value detected by the voltage detection unit 21 into digital signals.

The processor 31 performs an arithmetic process of estimating the position of the rotor 221 of the single-phase motor 220 using the digital signals of the current value and the voltage value obtained from the analog-digital converter 30, and generates a PWM (Pulse Width Modulation) signal for controlling the operation of the single-phase motor 220. As a control method in the processor 31, a general arbitrary control method can be adopted. The processor 31 can use, for example, position sensorless vector control, current control, power control, or the like as a control method. By performing control by such a control method, the electric blower 100 can operate the single-phase motor 220 at a rotation speed of about 100000 rpm. The drive signal generator 32 generates drive signals for turning on and off the switching elements 51 to 54 of the inverter 11 based on the PWM signal generated by the processor 31, and outputs the drive signals to the inverter 11.

The electric blower 100 sucks air from the suction port of the cylindrical housing 200 and rotates the blades 230 to flow the air toward the exhaust port under the control of the motor control device 10. The arrows shown in fig. 2 indicate the direction of wind, i.e., the flow of air. In fig. 2, the wind is shown flowing from the left to the right direction. The same applies to the following figures. Thus, the inside of the cylindrical housing 200 serves as an air passage of the electric blower 100.

In general, in a motor control device that detects the position of the rotor of a single-phase motor using a position sensor and controls the operation of the single-phase motor, the position sensor has to be disposed in the vicinity of the rotor of the single-phase motor. In the example of fig. 2, the substrate 210 needs to be disposed near the rotor 221 on the leeward side of the single-phase motor 220. In this case, the air passage inside the cylindrical housing 200 is closed by the substrate 210.

In contrast, the motor control device 10 of the present embodiment does not include a position sensor for detecting the position of the rotor 221 of the single-phase motor 220. Therefore, in the electric blower 100, the substrate 210 to which the motor controller 10 is attached can be provided in the cylindrical housing 200 in parallel to the air passage of the cylindrical housing 200, that is, in the direction of the arrow shown in fig. 2. In the electric blower 100, the base plate 210 on which the motor controller 10 is mounted is provided as shown in fig. 2, and the base plate 210 does not shield the air passage, so that the pressure loss in the air passage can be suppressed, the suction power can be increased, and the product suction force can be increased. That is, the electric blower 100 can reduce the pressure loss in the air passage and achieve high efficiency by causing the substrate 210 to follow the air passage. In addition, the electric blower 100 can efficiently cool heat generating components and the like mounted on the base plate 210.

In this way, the substrate 210 is disposed inside the cylindrical housing 200 at a position directly cooled by the wind generated by the blower motor 240. The substrate 210 is provided inside the cylindrical housing 200 in a direction parallel to the direction of the wind generated by the blower motor unit 240 on the surface of the substrate 210.

Further, if the motor control device includes a position sensor and the substrate is disposed so as to block the air passage, when the air sucked by the electric blower contains a large amount of moisture, the amount of moisture directly colliding with the substrate increases, and when a voltage is applied to the substrate, the metal ionized between the electrodes moves, and there is a possibility that ion migration occurs which causes a short circuit. Further, there is also a possibility of short-circuiting due to accumulation of dust, dirt, and the like. Therefore, when the position sensor is provided, a method of applying a moisture-proof agent to the substrate and isolating the substrate from the air passage is adopted as a countermeasure, but both methods lead to an increase in manufacturing cost.

In contrast, since the amount of moisture that directly collides with the substrate 210 is also reduced in the motor control device 10 of the present embodiment, the amount of the moisture-proofing agent can be reduced by suppressing the occurrence of ion migration. Further, the motor control device 10 is less likely to accumulate dust, dirt, moisture, and the like, and can prevent short-circuiting between patterns. Further, since the degree of freedom of substrate arrangement of the motor control device 10 is increased as compared with the case where the position sensor is provided, the quality of the substrate 210 can be improved by arranging the substrate 210 outside the cylindrical housing 200 as described later.

Further, the motor control device 10 of the present embodiment does not include the position sensor, and thus can eliminate the manufacturing process of mounting the position sensor and the adjustment process corresponding to the mounting deviation of the position sensor, and thus can significantly reduce the manufacturing cost. Further, since the motor control device 10 does not affect the aging change by the position sensor, the quality of the product can be improved.

In fig. 2 and 3, the battery 202 is not shown in the electric blower 100, but the battery 202 may be provided inside the cylindrical housing 200. Fig. 6 is a sectional view of a second example of the electric blower 100 according to embodiment 1. Fig. 7 is a side view of a second example of the electric blower 100 according to embodiment 1. The electric blower 100 further includes a battery 202 for supplying dc power to the board 210, i.e., the motor control device 10. The battery 202 is provided inside the cylindrical housing 200 at a position downstream of the substrate 210 in the air passage and in a direction parallel to the direction of the air generated by the blower motor 240. The battery 202 and the substrate 210, i.e., the motor control device 10, are connected via

wires

215 and 216. The battery 202 is provided to the cylindrical housing 200 through a support portion 217. The support portion 217 may be integrally formed with the cylindrical housing 200, or may be different from the cylindrical housing 200. The battery 202 may be provided in contact with the cylindrical housing 200 via a heat sink not shown. For example, by forming the shape of the cylindrical housing 200 side of the heat sink into a curved surface, the battery 202 can be brought into close contact with the cylindrical housing 200.

In general, the output of a product including battery 202, for example, the suction power of a vacuum cleaner described later, largely depends on the capacity of battery 202. Therefore, in order to maximizeTo obtain the output of the product to the maximum, it is necessary to derive the capacity of the battery 202 to the maximum. Since the voltage output from the battery 202 is roughly determined according to the battery capacity, a large amount of current needs to be flowed in order to increase the output. However, there is an internal impedance inside the battery 202. In the battery 202, heat generation (I) occurs by the flow of current²R), when the product output is increased, the heat generation of the battery 202 is also increased. Therefore, when the product output is increased, a member for dissipating heat from the battery 202 is required.

Further, the battery 202 has a relatively large volume of the heat generating source compared to other heat generating components constituting the electric apparatus. Therefore, it takes time for the battery 202 to emit heat as compared with other heat generating components. Examples of the other heat generating components include the switching elements 51 to 54 of the inverter 11 of the motor control device 10 mounted on the substrate 210 as a heat generating source. For example, when Power semiconductors of 5mm × 6mm size packaged in PQFN (Power Quad Flat No-lead) packages are used as the switching elements 51 to 54, the volume occupied by each of the switching elements 51 to 54 is 5mm × 6mm × 1mm — 30mm³. On the other hand, in the case of using 6 cylindrical lithium ion 2-time batteries having a diameter of 18mm and a length of 65mm as the battery 202, the volume of the battery 202 is about 100000mm³. Thus, the battery 202 occupies a larger volume than other heat generating components, and therefore takes longer time to dissipate heat than other heat generating components.

It is also considered that heat generated by the battery 202 may adversely affect other components of the electrical device. Therefore, it is considered that the heat insulating member is disposed so that heat does not move from the battery 202 to the components other than the battery 202. Examples of the heat insulating member include fiber-based heat insulating materials, foam-based heat insulating materials, aerogels, and vacuum heat insulating materials. If these heat insulating members are disposed between the battery 202 and other components, there are disadvantages such as an increase in manufacturing cost and an increase in the mass of the electric device.

Therefore, as shown in fig. 6 and 7, in the electric blower 100, the battery 202 is disposed downstream of the air flow inside the tubular housing 200, and the components with weak heat resistance, such as the substrate 210 and the blower motor 240, are disposed upstream. Thus, in the electric blower 100, the battery 202 itself can be cooled at the same time, while suppressing the occurrence of a problem that the heat of the battery 202 adversely affects other components. The electric blower 100 can efficiently cool the battery 202.

In fig. 6 and 7, the battery 202 and the substrate 210 are connected by the

leads

215 and 216, but the battery 202 and the substrate 210 may be directly connected. Fig. 8 is a sectional view of a third example of the electric blower 100 according to embodiment 1. A side view corresponding to the third example of the electric blower 100 of embodiment 1 is the same as that of fig. 7. In the third example of the electric blower 100 according to embodiment 1, the battery 202 and the substrate 210 are directly connected using terminals, connectors, or the like.

Accordingly, the electric blower 100 can reduce the cost of the

lead wires

215 and 216 because the

lead wires

215 and 216 between the battery 202 and the substrate 210 can be reduced. In addition, the electric blower 100 can reduce the loss of the amount of the

leads

215 and 216, and can achieve high efficiency. Further, since the electric blower 100 can reduce the wiring resistance between the battery 202 and the substrate 210, the voltage ripple, the current ripple, and the like of the power supply can be reduced, and the life of the battery 202 can be extended. In the case where the electric blower 100 is provided with a heat sink, not shown, on the substrate 210, the cost of the heat sink can be reduced by sharing the heat sink with the battery 202.

The electric blower 100 can also reduce the number of the

lead wires

211 and 212 between the single-phase motor 220 and the substrate 210. Fig. 9 is a sectional view of a fourth example of the electric blower 100 according to embodiment 1. Fig. 10 is a side view of a fourth example of the electric blower 100 according to embodiment 1. In the fourth example of the electric blower 100 according to embodiment 1, the single-phase motor 220 is directly connected to the substrate 210 using a terminal, a connector, or the like.

Accordingly, the electric blower 100 can reduce the number of the

lead wires

211 and 212 between the single-phase motor 220 and the substrate 210, thereby reducing the loss and achieving high efficiency. In addition, the electric blower 100 can reduce the pressure loss in the air passage caused by the

lead wires

211 and 212.

The operation of the electric blower 100 mounted on the stick-type electric vacuum cleaner will be described. The electric blower 100 generates suction force when driving the blower motor unit 240, and dust and the like are sucked from the suction portion together with air. The sucked dust is accumulated in the dust collecting part. Since the single-phase motor 220 of the blower motor unit 240 can be rotated at a high speed by the inverter 11, the air blowing efficiency can be improved even if the blades 230 of the blower motor unit 240 have a small diameter. As a result, a large air volume can be obtained in the blower motor unit 240. The electric blower 100 can obtain high suction performance even if the size of the blower motor part 240 is relatively small.

In the electric blower 100, the upper limit carrier frequency for efficiently driving the inverter 11 is, for example, about 30 kHz. On the other hand, it is also considered that the control becomes unstable as the rotation frequency of the single-phase motor 220 of the blower motor unit 240 becomes equal to 30 kHz. In such a case, in the electric blower 100, the number of poles of the single-phase motor 220 is set to 4 poles or less, which can avoid such a problem.

In addition, in the stick type electric vacuum cleaner, in order to improve the operability, it is required to be small and light. However, if the size of the blade 230 of the blower motor unit 240 is reduced, it is difficult to obtain the amount of work originally required for use as the electric vacuum cleaner. Therefore, in order to reduce the size and weight of the electric apparatus, which is a stick-type electric vacuum cleaner, the electric blower 100 may reduce the size of the blade 230 as much as possible and rotate the blade 230 at a higher speed to ensure a required amount of work. However, in order to rotate the blades 230 at a higher speed, the electric blower 100 needs to generate a larger torque by the single-phase motor 220.

As shown in the following equation (1), the torque T generated when the single-phase motor 220 rotates is determined by the product of the torque constant Kt and the motor current Ia.

T＝Kt×Ia…(1)

In the electric blower 100, in order to increase the torque T, it is conceivable to provide the single-phase motor 220 with a motor structure that can obtain a larger torque constant Kt, increase the motor current Ia, and the like. Here, in order to increase the torque constant Kt, it is conceivable to increase the number of turns of the motor winding, use stronger magnets, increase the lamination thickness of the stator, and the like in the single-phase motor 220. However, such a countermeasure has disadvantages of an increase in manufacturing cost, an increase in mass of the single-phase motor 220, and an increase in size of the single-phase motor 220.

Therefore, in the electric blower 100, in order to increase the torque T, a countermeasure of increasing the motor current Ia is considered. By increasing the motor current Ia in this manner, the electric blower 100 can obtain a larger torque while suppressing the disadvantages of an increase in manufacturing cost, an increase in mass, and an increase in size when the configuration of the single-phase motor 220 is changed as described above.

However, in the electric blower 100, it is considered to increase the heat generation amount of the portion where the current flows by increasing the motor current Ia. Therefore, in the electric blower 100, when the motor current Ia is equal to or greater than a certain value, in order to prevent damage to the equipment due to heat generation, for example, it is conceivable to use a heat-resistant material or a flame-retardant material as a material adjacent to the single-phase motor 220, the battery 202, the substrate 210, and the like. With such a configuration, the electric blower 100 can improve the reliability of the apparatus. As described above, by using a material having high thermal conductivity such as metal as the material adjacent to the single-phase motor 220, the battery 202, the substrate 210, and the like, the heat dissipation of the heat generating component such as the battery 202 can be improved.

The single-phase motor 220 of the blower motor unit 240 includes a rotor 221 using a permanent magnet. This improves the driving efficiency of the single-phase motor 220, and provides an energy saving effect. Further, the motor control device 10 includes the current detection unit 20 and the voltage detection unit 21 used for controlling the single-phase motor 220, thereby enabling the inverter 11 to be controlled with high accuracy.

Further, by forming the switching elements 51 to 54 of the inverter 11 from wide bandgap semiconductors, switching loss and conduction loss can be reduced by using low-loss semiconductor elements. By reducing the loss, an energy saving effect can be obtained, and a longer time operation can be realized.

The switching elements 51 to 54 of the inverter 11 are not limited to MOSFETs formed of silicon-based materials, and may be MOSFETs formed of wide band gap semiconductors such as silicon carbide, gallium nitride-based materials, or diamond. At least 1 of the switching elements 51 to 54 may be formed of a wide bandgap semiconductor.

In general, a wide band gap semiconductor has higher withstand voltage and heat resistance than a silicon semiconductor. Therefore, by using a wide bandgap semiconductor for the plurality of switching elements 51 to 54, the withstand voltage and the allowable current density of the switching elements are increased, and the semiconductor module incorporating the switching elements can be downsized. Further, since the wide bandgap semiconductor is also high in heat resistance, the heat radiating portion for radiating heat generated by the semiconductor module can be downsized, and the heat radiating structure for radiating heat generated by the semiconductor module can be simplified. Further, since the wide bandgap semiconductor has low loss, switching loss and conduction loss can be reduced, and energy saving effect can be obtained by reducing loss, and operation for a longer time can be realized.

As described above, according to the present embodiment, the electric blower 100 includes the blower motor unit 240 and the board 210 on which the motor control device 10 is mounted inside the cylindrical housing 200, and the board 210 is provided at a position cooled by the wind generated by the blower motor unit 240. Accordingly, the electric blower 100 can efficiently cool the heat generating components while being miniaturized, and can control the driving of the single-phase motor 220.

In addition, by using the single-phase motor 220 in the electric blower 100, the number of the

lead wires

211 and 212 between the single-phase motor 220 and the base plate 210 can be reduced from 3 to 2, as compared with the case of using a three-phase motor. The electric blower 100 can reduce the lead wire, thereby reducing the lead wire cost, reducing the loss due to the lead wire, and reducing the area of the substrate 210 by reducing the number of the substrate terminal connection portions, as compared with the case of using the three-phase motor. When the motor windings are connected in parallel, the single-phase motor 220 and the substrate 210 are connected by an even number of wires. When the single-phase motor 220 is directly connected to the substrate 210, the single-phase motor 220 and the substrate 210 are connected by an even number of terminals.

In the present embodiment, the case 200 having a cylindrical shape with a circular cross section in the longitudinal direction of the case has been described as an example of the case including the blower motor unit 240 and the substrate 210, but the shape of the case is not limited to this. As the housing provided with blower motor unit 240 and substrate 210, a housing having a polygonal shape such as a hexagon or an octagon in cross section in the longitudinal direction of the housing may be used. The same applies to the following embodiments.

Embodiment mode 2

In embodiment 1, the substrate 210 is provided inside the cylindrical housing 200. In embodiment 2, a case where the substrate 210 is provided outside the cylindrical housing 200 will be described.

Fig. 11 is a cross-sectional view of a first example of the electric blower 100a according to embodiment 2. Fig. 12 is a side view of a first example of the electric blower 100a according to embodiment 2. The electric blower 100a includes a blower motor unit 240 inside the tubular housing 200, and a substrate 210 outside the tubular housing 200. The single-phase motor 220 is connected to the substrate 210, i.e., the motor control device 10, via the

wires

211 and 212. The substrate 210 is provided so that the heat generating component 218 is in contact with the cylindrical housing 200. The heat generating component 218 is, for example, a power semiconductor of a PQFN package used in the inverter 11. The heat generating component 218 may be provided in contact with the cylindrical housing 200 via a heat sink not shown. For example, by forming the heat sink with a curved shape on the cylindrical housing 200 side, the heat generating member 218 can be brought into close contact with the cylindrical housing 200. Further, the substrate 210 is provided to the cylindrical housing 200 through the support part 219. The support part 219 may be integrally formed with the cylindrical housing 200, or may be different from the cylindrical housing 200.

In the electric blower 100a, the tubular housing 200 is used as a heat sink for the heat generating component 218. Even if the temperature of the cylindrical housing 200 rises due to the heat of the heat generating component 218, the temperature can be lowered because the inside receives the wind from the blower motor 240.

By providing the substrate 210 outside the cylindrical housing 200, the electric blower 100a can reduce the pressure loss in the air passage inside the cylindrical housing 200, and can achieve high efficiency. In addition, the electric blower 100a is less likely to accumulate dust, dirt, moisture, and the like on the substrate 210, and can prevent short-circuiting between patterns. In addition, the electric blower 100a can efficiently cool the heat generating component 218. The substrate 210 is provided outside the cylindrical housing 200 at a position indirectly cooled by wind generated by the blower motor 240. The substrate 210 is provided outside the cylindrical housing 200 so that the heat generating component 218 mounted thereon directly or indirectly contacts the cylindrical housing 200.

In fig. 11 and 12, the battery 202 is not shown in the electric blower 100a, but the battery 202 may be provided outside the tubular housing 200. Fig. 13 is a sectional view of a second example of the electric blower 100a according to embodiment 2. Fig. 14 is a side view of a second example of the electric blower 100a according to embodiment 2. The electric blower 100a further includes a battery 202 for supplying dc power to the board 210, i.e., the motor control device 10. The battery 202 is provided outside the cylindrical housing 200 downstream of the substrate 210 with respect to the air passage and is directly or indirectly in contact with the cylindrical housing 200. The battery 202 and the substrate 210, i.e., the motor control device 10, are connected via

wires

215 and 216. The battery 202 is provided to the cylindrical housing 200 through the support portion 222. Support portion 222 may be integrally formed with cylindrical housing 200, or may be different from cylindrical housing 200. The battery 202 may be provided in contact with the cylindrical housing 200 via a heat sink not shown. For example, by forming the shape of the cylindrical housing 200 side of the heat sink into a curved surface, the battery 202 can be brought into close contact with the cylindrical housing 200.

In the electric blower 100a, the tubular housing 200 is used as a heat sink for the battery 202. Even if the temperature of the cylindrical housing 200 rises due to the heat of the battery 202, the temperature can be lowered because the inside receives the wind from the blower motor 240.

The electric blower 100a can efficiently cool the battery 202 by disposing the battery 202 outside the cylindrical housing 200. Further, the electric blower 100a can reduce the pressure loss in the air passage, and can achieve high efficiency.

In fig. 13 and 14, the battery 202 and the substrate 210 are connected by the

leads

215 and 216, but the battery 202 and the substrate 210 may be directly connected. Fig. 15 is a sectional view of a third example of the electric blower 100a according to embodiment 2. A side view corresponding to the third example of the electric blower 100a of embodiment 2 is the same as that of fig. 14. In the third example of the electric blower 100a according to embodiment 2, the battery 202 is directly connected to the substrate 210 using terminals, connectors, and the like. Accordingly, the electric blower 100a can reduce the cost of the

lead wires

215 and 216 because the

lead wires

215 and 216 between the battery 202 and the substrate 210 can be reduced. In addition, the electric blower 100a can reduce the loss of the amount of the

leads

215 and 216, and can achieve high efficiency. Further, since the electric blower 100a can reduce the wiring resistance between the battery 202 and the substrate 210, the voltage ripple, the current ripple, and the like of the power supply can be reduced, and the life of the battery 202 can be extended. In the case where the heat sink, not shown, is provided on the substrate 210, the electric blower 100a can reduce the cost of the heat sink by sharing the heat sink with the battery 202.

As described above, according to the present embodiment, the electric blower 100a includes the blower motor unit 240 inside the tubular housing 200, the board 210 to which the motor control device 10 is attached outside the tubular housing 200, and the board 210 is provided at a position cooled by the wind generated by the blower motor unit 240. Accordingly, the electric blower 100a can efficiently cool the heat generating components while being miniaturized, and can control the driving of the single-phase motor 220.

Embodiment 3

In embodiment 3, an application example of the electric blower 100 of embodiment 1 will be described. The electric blower 100 of embodiment 1 is described as an example, but the electric blower 100a of embodiment 2 may also be applied.

Fig. 16 is a diagram showing a configuration example of an electric vacuum cleaner 61 including an electric blower 100 according to embodiment 3. The electric vacuum cleaner 61 includes an electric blower 100, a dust collecting chamber 65, a suction port body 63, an extension pipe 62, and an operation unit 66. The electric vacuum cleaner 61 is used by a user holding the operation portion 66. The user turns on a power switch, not shown, to supply electric power from the battery 202 to the blower motor unit 240 via the motor control device 10 of the board 210. The blower motor 240 of the electric vacuum cleaner 61 is driven to suck dust from the suction port body 63 through the extension pipe 62 into the dust collecting chamber 65.

In the electric vacuum cleaner 61, the size and weight are reduced, and the output density of the output per unit volume is increased. In such a product structure, the electric blower 100 is more preferably structured so that the heat generating portion can be cooled more efficiently, and thus a product with further reduced size can be provided.

Fig. 17 is a diagram showing a configuration example of a hand dryer 90 including an electric blower 100 according to embodiment 3. The hand dryer 90 includes a case 91, a hand detection sensor 92, a water receiving portion 93, a drain container 94, a cover 96, a sensor 97, an air inlet 98, and an electric blower 100. Here, the sensor 97 is any one of a gyro sensor and a human body sensor. In the hand dryer 90, the hand is inserted into the hand insertion portion 99 positioned above the water receiving portion 93, so that the air blown by the electric blower 100 blows off the water, and the blown-off water is collected in the water receiving portion 93 and stored in the drain container 94.

The demand for thinning the hand dryer 90 is also increasing due to restrictions on installation locations and the like. Further, in view of the widespread use in general households, there is a demand for smaller and more easily installed products. Therefore, for further miniaturization, it is important to efficiently cool the heat generating portion. In such a product structure, the electric blower 100 is more preferably structured so that the heat generating portion can be cooled more efficiently, and thus a product with further reduced size can be provided.

As described above, in the present embodiment, the configuration example in which the electric blower 100 is applied to the electric vacuum cleaner 61 and the hand dryer 90 is described, but the electric blower 100 can be applied to an electric device in which a motor is mounted. The electric equipment equipped with a motor is a canister type electric vacuum cleaner, an incinerator, a pulverizer, a dryer, a dust collector, a printing machine, a cleaning machine, a spotting machine, a tea making machine, a woodworking machine, a plastic extruder, a corrugating machine, a packaging machine, a hot air generator, an OA equipment, an electric blower, or the like. The electric blower is a blowing member for conveying objects, for dust collection, or for general blowing and exhausting.

The configuration described in the above embodiment is an example of the contents of the present invention, and may be combined with other known techniques, and a part of the configuration may be omitted or modified within a range not departing from the gist of the present invention.

Description of reference numerals

10 motor control device, 11 inverter, 20 current detecting part, 21 voltage detecting part, 30 analog-digital converter, 31 processor, 32 driving signal generating part, 51-54 switching element, 61 electric vacuum cleaner, 62 extension tube, 63 suction inlet body, 65 dust collecting chamber, 66 operation part, 90 hand dryer, 91 shell, 92 hand detecting sensor, 93 water receiving part, 94 drainage container, 96 cover, 97 sensor, 98 suction inlet, 99 hand inserting part, 100a electric blower, 200 barrel-shaped frame, 202 battery, 210 substrate, 211, 212, 215, 216 lead, 213, 214, 217, 219, 222 supporting part, 218 heating part, 220 single phase motor, 221 rotor, 230 blade, 240 blower motor part.

Claims

1. An electric blower in which, in a blower,

the electric blower is provided with:

a blower motor unit having a blade and a single-phase motor for mounting the blade to a rotor;

a substrate on which a motor control device is mounted, the motor control device having an inverter that outputs ac power to the single-phase motor and controlling driving of the single-phase motor; and

a frame body provided with the blower motor part and the substrate,

the base plate is disposed at a position directly or indirectly cooled by wind generated by the blower motor part.

2. The electric blower according to claim 1,

the base plate is provided inside the housing in a direction parallel to a direction of wind generated by the blower motor unit.

3. The electric blower according to claim 2,

the electric blower further includes a battery provided inside the housing at a position downstream of the air passage with respect to the base plate, and provided in a direction parallel to a direction of the wind generated by the blower motor unit, and configured to supply dc power to the motor control device.

4. The electric blower according to claim 2 or 3, wherein,

the substrate and the single-phase motor are connected through even number of wires or even number of terminals.

5. The electric blower according to claim 1,

the substrate is disposed outside the frame such that the mounted heat generating component is in direct or indirect contact with the frame.

6. The electric blower according to claim 5,

the electric blower further includes a battery that is provided outside the housing downstream of the board with respect to the air passage and that is in direct or indirect contact with the housing, and that supplies the motor control device with dc power.

7. The electric blower according to claim 3 or 6, wherein,

the battery is connected to the substrate directly or via a wire.

8. The electric blower according to any one of claims 1 to 7,

at least 1 of the plurality of switching elements included in the inverter is formed of a wide bandgap semiconductor.

9. The electric blower according to claim 8,

the wide band gap semiconductor is silicon carbide, gallium nitride or diamond.

10. An electric vacuum cleaner, wherein,

the electric vacuum cleaner is provided with the electric blower described in any one of claims 1 to 9.

11. A hand dryer, wherein,

the hand dryer is provided with the electric blower according to any one of claims 1 to 9.