CN107408865A - Motor and ventilation fan - Google Patents

Abstract

A DC brushless motor (1) is provided with: a frame (50) formed of a frame (2) provided with a frame flange (2b) and a cover (8) provided with a cover flange (8 a); a stator (3) provided inside the frame (2); a rotor (6b) disposed inside the stator (3); a shaft (6a) connected to the rotor (6 b); a bracket (7) which divides the interior of the housing (50) into a frame (2) side and a cover (8) side and rotatably holds the shaft (6 a); a substrate (9) which is provided with a circuit for controlling the rotor (6b) and is arranged in a space between the bracket (7) and the cover (8); a lead (32) that is inserted into the housing (50) through a through-hole (8b) provided in the cover (8); and a filler (33) which is formed with a lead insertion hole (33a) into which the lead (32) is inserted and is provided on the cover flange (8 a).

Description

Electric motor and ventilation fan

technical field

The present invention relates to a motor and a ventilation fan including a stator and a rotor.

Background technique

Conventionally, as a motor of a ceiling-mounted ventilation fan, a motor having a rotor disposed inside a stator and rotating a shaft connected to the rotor has been used. Patent Document 1 discloses a motor that includes: a bearing that holds a shaft rotatably; a bracket that holds the bearing; and a base plate that is provided on the The side opposite the bearing. In the electric motor like patent document 1, the frame body consists of a frame and a cover, and the structure in which lead wires are drawn out from the cover side is employ|adopted in many cases.

In the ventilating fan having the above-mentioned structure, the motor is attached to the motor attachment hole provided in the top plate of the box-shaped main body frame from the inside, and the lead wires are drawn. In addition, a terminal block for supplying power is provided inside the ventilating fan, and lead wires of the motor are also drawn into the inside of the main body frame. In this way, in order to lead the lead wires of the motor into the inside of the main body frame, insertion holes through which the lead wires of the motor are inserted are often provided in the top plate of the ventilating fan.

In the ventilating fan as described above, a waterproofing measure is realized by wrapping a filler (Japanese: パッズン material) around the lead wire so as to fill the gap formed between the cover and the top plate.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2012-253845

Contents of the invention

The problem to be solved by the invention

However, in a ventilating fan in which a filler is wound around a lead wire, depending on the shape of the lead wire insertion hole of the top plate, the filler may come into contact with the blades of the ventilating fan, or the performance of the ventilating fan may deteriorate due to wind or moisture leaking from the gap. situation.

In addition, when the ventilation fan is installed in the bathroom, the ventilation fan sucks humid air in the bathroom, and the sucked air leaks into the ceiling, causing condensation or mold to form in the ceiling, shortening the life of the house. . In addition, since humid air penetrates into the motor, dew condensation may occur on a circuit board built in the motor to cause a short circuit.

The present invention has been made in view of the above problems, and an object of the present invention is to obtain a motor that prevents air from leaking from between the top plate of the ventilation fan without the filler coming into contact with the blades of the ventilation fan.

solutions to problems

In order to solve the above-mentioned problems and achieve the purpose, the present invention has a frame body. The frame body is formed by a frame and a cover. The bottom is cylindrical, and a cover flange is provided at the edge of the opening, and the cover is combined with the frame so that the frame flange matches the cover flange. In addition, the present invention has a cylindrical stator provided inside the frame. In addition, the present invention has a rotor arranged inside the stator. In addition, the present invention has a shaft connected to the rotor. In addition, the present invention has a bracket including a bracket flange sandwiched between the frame flange and the cover flange, which divides the inside of the frame into the frame side and the cover side, and holds the shaft in a rotatable manner. In addition, the present invention has a substrate provided with a circuit for controlling the rotor and provided in a space between the bracket and the cover. In addition, the present invention has lead wires that are drawn into the housing through through holes provided in the cover to supply power to the substrate. In addition, the present invention has a filler formed with a lead wire insertion hole into which a lead wire is inserted, and the filler is provided on the cover flange.

Invention effect

The electric motor of the present invention exhibits the effect that air can be prevented from leaking from between the top plate of the ventilation fan without the filler coming into contact with the blades of the ventilation fan.

Description of drawings

FIG. 1 is a side view of a brushless DC motor according to an embodiment of the present invention.

Fig. 2 is a plan view of a filler of the brushless DC motor according to the embodiment.

Fig. 3 is a cross-sectional view of the ventilation fan according to the embodiment.

Fig. 4 is a plan view of a top plate of the ventilating fan according to the embodiment.

Fig. 5 is a plan view of the mounting portion of the brushless DC motor of the ventilating fan according to the embodiment viewed from the suction port side.

detailed description

Hereinafter, the electric motor and ventilation fan which concerns on embodiment of this invention are demonstrated in detail based on drawing. In addition, this invention is not limited by this embodiment.

Implementation method.

FIG. 1 is a side view of a brushless DC motor according to an embodiment of the present invention. In FIG. 1 , a section on the left side of the central axis 30 is shown. In addition, in FIG. 1, hatching other than the bracket 7 is abbreviate|omitted in order to understand a structure easily.

The DC brushless motor 1 as an electric motor accommodates various components inside a frame body 50 composed of a frame 2 and a cover 8. The frame 2 is in a cylindrical shape with a bottom, and a frame flange 2b is provided on the edge of the opening. The cover 8 has a bottomed cylindrical shape, has a cover flange 8a at the edge of the opening, and is combined with the frame 2 such that the frame flange 2b matches the cover flange 8a. The frame 2 is made of metal. The cylindrical stator 3 is press-fitted into the cylinder of the frame 2 and accommodated. That is, the cylindrical stator 3 is provided inside the frame 2 . The stator 3 is constituted by winding a coil 3b around an iron core 3a. The frame flange 2b is provided on the open side of the frame 2 in a flange shape.

The annular rotor 6 b is disposed inside the stator 3 . A shaft 6a extending along a central axis 30 of the stator 3 is connected to a rotor 6b. One end of the shaft 6 a protrudes laterally to the outside of the frame 2 . In the following description, one end side of the shaft 6 a protruding outward from the frame 2 is referred to as a front side, and the other end side is referred to as a rear side.

On the shaft 6a, a front bearing 4a is provided on the front side of the connection between the shaft 6a and the rotor 6b, and a rear bearing 4b is provided on the rear side of the connection between the shaft 6a and the rotor 6b. The front bearing 4 a and the rear bearing 4 b hold the shaft 6 a rotatably about the center shaft 30 . The front side bearing 4 a is held by a housing 2 a formed on the frame 2 .

A bracket 7 holding the rear bearing 4b is provided on the side opposite to the rotor 6b across the rear bearing 4b, in other words, on the rear side of the rear bearing 4b. The bracket 7 holds the shaft 6a via the rear side bearing 4b. That is, the bracket 7 holds the shaft 6a rotatably. A resin-made bracket is used as the bracket 7 . A bracket case 7 b holding the rear bearing 4 b is formed on the bracket 7 . The spring 5 is provided between the bracket 7 and the rear side bearing 4b. The spring 5 applies a force in a direction to separate the rear bearing 4 b from the bracket 7 along the center axis 30 . The spring 5 applies to the rear bearing 4 b a force required to properly operate the rear bearing 4 b.

The bracket 7 has a disk shape so as to close the open side end of the frame 2 . The outer peripheral part of the bracket 7 is a bracket flange 7 a, and this bracket flange 7 a is sandwiched between the frame flange 2 b of the frame 2 and the cover flange 8 a of the cover 8 as shown in FIG. 1 . The frame 2, the cover 8, and the bracket 7 are screwed and fixed by screws 41 penetrating through the frame flange 2b, the cover flange 8a, and the bracket flange 7a.

On the side opposite to the rotor 6 b across the bracket 7 , in other words, on the rear side of the bracket 7 , a board 9 having a circuit for controlling the rotor 6 b is arranged. The force acting on the substrate 9 side is applied to the bracket 7 by the spring 5 .

The bracket 7 partitions the frame body 50 formed by the frame 2 and the cover 8 into a motor unit 51 in which the rotor 6 b and the stator 3 are arranged, and a circuit unit 52 in which the substrate 9 is arranged. That is, the bracket 7 includes a bracket flange 7a sandwiched between the frame flange 2b and the cover flange 8a, and divides the inside of the frame body 50 into a motor unit 51 on the frame 2 side and a circuit unit 52 on the cover 8 side. The motor part 51 is a space between the frame 2 and the bracket 7 , and the circuit part 52 is a space between the cover 8 and the bracket 7 .

Holes for screwing and fixing the brushless DC motor 1 to a product are formed in the bracket flange 7a, the frame flange 2b, and the cover flange 8a. An example of a product to which the DC brushless motor 1 is fixed includes a ventilation fan.

A commercial AC voltage is supplied from the outside to the substrate 9 having a circuit for controlling the rotor 6b through lead wires 32, and the AC voltage is converted to a DC voltage by a power supply circuit as an electronic component to supply power according to the voltage of each element. A drive circuit as an electronic component generates an AC voltage so that current flows in a set direction to the coil 3b provided in the stator 3 through the pin 3c. The rotor 6b and the shaft 6a rotate because a magnetic field is generated by the current flowing through the coil 3b.

The microcontroller as an electronic component detects the phase of the induced voltage of the DC brushless motor 1 based on the signal of the magnetic sensor 31 using a Hall element (Japanese: ホールス子), and controls it so that the phase of the induced voltage is consistent with that generated by the drive circuit. The phases of the phase currents of the DC brushless motor 1 become the same phase. The efficiency of the brushless DC motor 1 can be improved by controlling the phase of the induced voltage to be the same phase as the phase current of the brushless DC motor 1 .

The lead wires 32 are drawn into the housing 50 through the through-holes 8 b provided in the cylindrical portion of the cover 8 to supply power to the substrate 9 . The lead wires 32 are passed through the filler 33 provided with the lead wire insertion holes 33a, and then lead around to the main body of the ventilation fan. The filler piece 33 is arranged on the cover flange 8a. That is, the lead wire 32 passes through the lead wire insertion hole 33a. The diameter of the lead wire insertion hole 33a is smaller than the diameter of the lead wire 32, and the lead wire 32 is inserted into the lead wire insertion hole 33a so that the lead wire insertion hole 33a is expanded. Therefore, air leakage between the lead wire 32 and the lead wire insertion hole 33a is prevented. The lead wire insertion hole 33a is formed at a position not overlapping the cover flange 8a.

Fig. 2 is a plan view of a filler of the brushless DC motor according to the embodiment. In FIG. 2 , filler 33 is a shape obtained by removing two corners of one short side of a rectangle, but it can be any shape matching the shape of the ventilation fan as long as lead wire insertion hole 33a is provided. Specifically, the filler 33 can also be formed in a circular or triangular shape.

Fig. 3 is a cross-sectional view of the ventilation fan according to the embodiment. In FIG. 3 , hatching of some elements of the ventilating fan 11 is omitted for easy understanding of the drawing. Ventilation fan 11 is configured by attaching brushless DC motor 1 to main body 12 . A vane 13 is fixed to the tip of the shaft 6 a of the brushless DC motor 1 .

Ventilation fan 11 has a structure in which main body 12 is provided on ceiling panel 14 and grille 15 is attached to main body 12 . As shown by the arrow D in FIG. 3 , by rotating the vane 13 together with the shaft 6a of the brushless DC motor 1, the air sucked from the suction port 12a through the grille 15 is sent to the blowing port 12b by the vane 13, thereby generating air flow. flow.

Fig. 4 is a plan view of a top plate of the ventilating fan according to the embodiment. The main body 12 has a box shape including a top plate 16 formed with a motor attachment hole 16 a through which the cover 8 can pass. The DC brushless motor 1 is inserted into the motor mounting hole 16 a from the side of the cover 8 so that the cover 8 protrudes above the top plate 16 . Motor mounting holes 16 a and cutouts 16 b for lead wires are provided in the top plate 16 . The lead wire 32 passes through the cutout 16b and leads to the inside of the main body of the ventilation fan 11 .

Fig. 5 is a plan view of the mounting portion of the brushless DC motor of the ventilating fan according to the embodiment viewed from the suction port side. The filler 33 is sandwiched between the cover flange 8a and the top plate 16 to close the notch 16b. That is, the filler 33 is sandwiched between the top plate 16 and the cover flange 8a, and seals the gap between the top plate 16 and the cover flange 8a. Therefore, the air sucked by the ventilation fan 11 does not intrude into the ceiling. In addition, since the filler 33 is provided on the shroud flange 8 a and is sandwiched between the shroud flange 8 a and the top plate 16 , it does not come into contact with the blade 13 .

As shown in FIG. 1 , in the brushless DC motor 1 , the circuit unit 52 on which the substrate 9 is arranged, and the motor unit 51 on which the rotor 6 b and the stator 3 are arranged are separated by a bracket 7 . Therefore, although the motor unit 51 is exposed to the air flow, the circuit unit 52 is a space isolated from the air flow, and is less likely to be a high-humidity space. Therefore, there is no disadvantage such as a short circuit caused by dew condensation on the substrate 9, and safety is improved.

The ventilation fan 11 provided with the DC brushless motor 1 can be used for ventilation in a high-humidity environment. As a high-humidity environment, the air in a bathroom is mentioned as an example.

In addition, in the above description, the filler 33 is formed in a shape that abuts only on the portion around the notch 16b of the top plate 16, but it may also include an annular portion similar to the cover flange 8a and a portion protruding from the annular portion. The tongue portion, the tongue portion blocks the incision 16 . By configuring the filler 33 in this way, air leakage from the gap between the top plate 16 and the cover 8 can be prevented.

The configuration shown in the above embodiments is an example of the content of the present invention, and it can be combined with other known techniques, and part of the configuration can be omitted or changed without departing from the gist of the present invention.

Explanation of reference signs

1: brushless DC motor; 2: frame; 2a: housing; 2b: frame flange; 3: stator; 3a: iron core; 3b: coil; 3c: pin; 4a: front bearing; 4b: rear bearing ;5: spring; 6a: shaft; 6b: rotor; 7: bracket; 7a: bracket flange; 8: cover; 8a: cover flange; 8b: through hole; 9: base plate; 11: ventilation fan; 12: Main body; 12a: suction port; 12b: blowing port; 13: vane; 14: ceiling plate; 15: grid; 16: top plate; 16a: motor installation hole; 16b: cutout; 30: central axis; 31: magnetic sensor; 32: lead wire; 33: filler; 33a: lead wire insertion hole; 41: screw; 50: frame body; 51: motor part; 52: circuit part.

Claims (3)

1. An electric motor, characterized in that it possesses: A frame body, the frame body is formed by a frame and a cover, the frame has a bottomed cylindrical shape, and a frame flange is provided on the edge of the opening, the cover is in a bottomed cylindrical shape, and a cover is provided on the edge of the opening a flange, the shroud is combined with the frame in such a manner that the frame flange matches the shroud flange; a cylindrical stator, the stator is disposed inside the frame; a rotor, the rotor is arranged inside the stator; a shaft coupled to the rotor; a bracket having a bracket flange sandwiched between the frame flange and the cover flange, dividing the inside of the frame into the frame side and the cover side, and dividing the shaft remain capable of rotation; a substrate provided with a circuit for controlling the rotor and disposed in a space between the bracket and the cover; a lead wire introduced into the frame through a through hole provided in the cover, and supplies power to the substrate; and The filler is formed with a lead wire insertion hole into which the lead is inserted, and the filler is provided on the cover flange. 2. The electric motor according to claim 1, characterized in that, The lead wire is inserted into the lead wire insertion hole so as to expand the lead wire insertion hole. 3. A ventilation fan, characterized in that it has: The electric motor as claimed in claim 1 or 2; blades coupled to the shaft; and a body that houses the blades therein, The main body is box-shaped with a top plate, and the top plate is formed with a motor mounting hole through which the cover can pass, The motor is inserted into the motor mounting hole from the side of the cover so that the cover protrudes upward from the top plate, The filler is sandwiched between the top plate and the cover flange to seal a gap between the top plate and the cover flange.