JP6293373B2 - Electric motor and ventilation fan - Google Patents

Description

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

  2. Description of the Related Art Conventionally, an electric motor for rotating a shaft connected to a rotor is used as an electric motor for a ceiling-mounted ventilation fan. Patent Document 1 discloses an electric motor including a bearing that rotatably holds a shaft, a bracket that holds the bearing, and a substrate that is provided on the opposite side of the bearing with the bracket interposed therebetween. In an electric motor such as that disclosed in Patent Document 1, many cases are adopted in which a casing is configured by a frame and a cover, and a lead wire is drawn out from the cover side.

  In the ventilation fan having the above-described configuration, a motor is mounted from the inside to a motor mounting hole provided in the top plate of the box-shaped main body frame, and a lead wire is routed. Further, a terminal block for supplying power is provided inside the ventilation fan, and the lead wire of the electric motor is also drawn inside the main body frame. Thus, since the lead wire of the electric motor is drawn into the inside of the main body frame, an insertion hole for passing the lead wire of the electric motor is often provided in the top plate of the ventilation fan.

  In the ventilation fan as described above, a waterproof measure is taken by winding a packing material around the lead wire so as to fill a gap formed between the cover and the top plate.

JP 2012-253845 A

  However, in a ventilation fan that wraps packing material around the lead wire, depending on the shape of the lead wire insertion hole in the top plate, the packing material may come into contact with the blades of the ventilation fan, or wind or moisture may leak from the gap and the performance of the ventilation fan will deteriorate. Sometimes it happened.

  In addition, when a ventilation fan is installed in the bathroom, the ventilation fan sucks in the moist air in the bathroom, and the sucked air leaks into the ceiling, causing condensation or mold in the ceiling, which can shorten the life of the house. Sometimes it was shortened. In addition, when moist air enters the motor, dew condensation occurs on the circuit board built in the motor, which may cause a problem such as a short circuit.

  The present invention has been made in view of the above, and an object of the present invention is to obtain an electric motor in which a packing material is not in contact with a blade of a ventilation fan and air is prevented from leaking from between the top plate of the ventilation fan. To do.

  In order to solve the above-described problems and achieve the object, the present invention provides a frame having a bottomed cylindrical shape with a frame flange provided at an opening edge, and a bottomed cylindrical shape having an opening edge. Is provided with a cover flange, and has a housing formed by a frame and a cover combined with the frame so as to match the cover flange. Moreover, this invention has the cylindrical stator installed in the inside of a flame | frame. Moreover, this invention has a rotor arrange | positioned inside a stator. The present invention also includes a shaft coupled to the rotor. The present invention also includes a bracket flange that is sandwiched between a frame flange and a cover flange, divides the inside of the housing into a frame side and a cover side, and holds the shaft rotatably. In addition, the present invention includes a circuit board that is provided in a space between the bracket and the cover, and includes a circuit that controls the rotor. The present invention also has a lead wire that is drawn into the housing through a through hole provided in the cover and supplies power to the substrate. In addition, the present invention has a packing material that is formed on a cover flange, in which a lead wire insertion hole into which a lead wire is inserted is formed.

  The electric motor according to the present invention has an effect that the packing material does not come into contact with the blades of the ventilation fan, and air can be prevented from leaking from between the top plate of the ventilation fan.

The side view of the DC brushless motor which concerns on embodiment of this invention Plan view of packing material of DC brushless motor according to embodiment Sectional drawing of the ventilation fan which concerns on embodiment The top view of the top plate of the ventilation fan which concerns on embodiment The top view which looked at the attachment part of the direct-current brushless motor of the ventilation fan which concerns on embodiment from the suction inlet side

  Below, the electric motor and ventilation fan which concern on embodiment of this invention are demonstrated in detail based on drawing. Note that the present invention is not limited to the embodiments.

Embodiment.
FIG. 1 is a side view of a DC brushless motor according to an embodiment of the present invention. In FIG. 1, the left side of the central axis 30 shows a cross section. In FIG. 1, hatching other than the bracket 7 is omitted for easy understanding of the configuration.

  A DC brushless motor 1 that is an electric motor has a bottomed cylindrical shape with a frame flange 2b provided at the opening edge, and a bottomed cylindrical shape with a cover flange 8a provided at the opening edge. Each element is housed in a housing 50 constituted by a cover 8 combined with the frame 2 so as to match the frame flange 2b and the cover flange 8a. The frame 2 is made of metal. In the cylinder of the frame 2, a stator 3 having a cylindrical shape is press-fitted and accommodated. That is, a cylindrical stator 3 is installed inside the frame 2. The stator 3 is configured by winding a coil 3b around an iron core 3a. On the open side of the frame 2, a frame flange 2b is provided in a bowl shape.

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

  The shaft 6a is provided with a front bearing 4a on the front side of the connecting portion with the rotor 6b, and with a rear bearing 4b on the rear side of the connecting portion with the rotor 6b. The front bearing 4a and the rear bearing 4b hold the shaft 6a rotatably about the central axis 30. The front bearing 4 a is held by a housing 2 a formed on the frame 2.

  A bracket 7 for 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 bearing 4b. That is, the bracket 7 holds the shaft 6a rotatably. The bracket 7 is made of resin. The bracket 7 is formed with a bracket housing 7b that holds the rear bearing 4b. A spring 5 is installed between the bracket 7 and the rear bearing 4b. The spring 5 exerts a force in a direction in which the rear bearing 4 b and the bracket 7 are separated along the central axis 30. The spring 5 applies a force necessary for the rear bearing 4b to operate properly to the rear bearing 4b.

  The bracket 7 has a disk shape so as to close the open end of the frame 2. An outer peripheral portion of the bracket 7 is a bracket flange 7a, and is sandwiched between the frame flange 2b of the frame 2 and the cover flange 8a of the cover 8 as shown in FIG. The frame 2, the cover 8, and the bracket 7 are screwed and fixed with screws 41 that penetrate the frame flange 2 b, the cover flange 8 a, and the bracket flange 7 a portion.

  A board 9 having a circuit for controlling the rotor 6b is disposed on the side opposite to the rotor 6b with the bracket 7 interposed therebetween, in other words, on the rear side of the bracket 7. A biasing force that is biased toward the substrate 9 is applied to the bracket 7 by the spring 5.

  The bracket 7 partitions the housing 50 formed by the frame 2 and the cover 8 into a motor unit 51 in which the rotor 6b 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 housing 50 into a motor unit 51 on the frame 2 side and a circuit unit 52 on the cover 8 side. The motor unit 51 is a space between the frame 2 and the bracket 7, and the circuit unit 52 is a space between the cover 8 and the bracket 7.

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

  A commercial AC voltage is supplied to the board 9 having a circuit for controlling the rotor 6b from the outside by a lead wire 32, and the AC voltage is converted into a DC voltage by a power supply circuit which is an electronic component, and is adapted to each element. Power is supplied with voltage. The drive circuit which is an electronic component generates an AC voltage through the pin 3c so that a current flows in a set direction with respect to the coil 3b provided in the stator 3. The rotor 6b and the shaft 6a rotate when a current flows through the coil 3b to generate a magnetic field.

  The microcontroller, which is an electronic component, detects the induced voltage phase of the DC brushless motor 1 based on the signal of the magnetic sensor 31 using a Hall element, and the induced voltage phase and the phase current of the DC brushless motor 1 generated from the drive circuit. The control is performed so that the phase of the phase becomes the same as that of the first phase. By controlling the induced voltage phase and the phase current of the DC brushless motor 1 to be in phase, the efficiency of the DC brushless motor 1 can be improved.

  The lead wire 32 is drawn into the housing 50 through the through hole 8 b provided in the cylindrical shape portion of the cover 8 and supplies power to the substrate 9. The lead wire 32 is routed to the ventilation fan body after passing through the packing material 33 provided with the lead wire insertion hole 33a. The packing material 33 is installed on the cover flange 8a. That is, the lead wire 32 is passed 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 by expanding the lead wire insertion hole 33a. 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 that does not overlap the cover flange 8a.

  FIG. 2 is a plan view of the packing material of the DC brushless motor according to the embodiment. In FIG. 2, the packing material 33 has a shape in which both corners of a rectangular short side are removed. However, if the lead wire insertion hole 33a is provided, the packing material 33 may have a shape that matches the shape of the ventilation fan. Absent. Specifically, the packing material 33 can be circular or triangular.

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

  The ventilation fan 11 has a structure in which a body 12 is installed on a ceiling plate 14 and a grill 15 is attached to the body 12. As the vane 13 rotates together with the shaft 6a of the DC brushless motor 1, the air sucked from the inlet 12a through the grille 15 is sent to the outlet 12b by the vane 13 as shown by the arrow D in FIG. Will occur.

  FIG. 4 is a plan view of the top plate of the ventilation fan according to the embodiment. The body 12 has a box shape including a top plate 16 in which a motor mounting hole 16a through which the cover 8 can pass is formed. The DC brushless motor 1 is inserted into the motor mounting hole 16a from the cover 8 side so that the cover 8 protrudes on the top plate 16. The top plate 16 is provided with a motor mounting hole 16a and a lead wire notch 16b. The lead wire 32 is routed into the main body of the ventilation fan 11 through the notch 16b.

  FIG. 5 is a plan view of the attachment portion of the direct current brushless motor of the ventilation fan according to the embodiment as viewed from the suction port side. The packing material 33 is sandwiched between the cover flange 8a and the top plate 16, and has a structure for closing the notch 16b. That is, the packing material 33 is sandwiched between the top plate 16 and the cover flange 8a to seal the gap between the top plate 16 and the cover flange 8a. Therefore, the air sucked by the ventilation fan 11 does not enter the back of the ceiling. Further, since the packing material 33 is installed on the cover flange 8 a and is sandwiched between the top plate 16 and the packing material 33, the packing material 33 does not contact the blade 13.

  As shown in FIG. 1, in the DC brushless motor 1, a circuit portion 52 where the substrate 9 is disposed and a motor portion 51 where the rotor 6 b and the stator 3 are disposed are partitioned by a bracket 7. Therefore, although the motor unit 51 is exposed to the air flow, the circuit unit 52 is a space that is cut off from the air flow and is not likely to be a high humidity space. Therefore, dew condensation occurs on the substrate 9 and there is no possibility of causing a problem such as a short circuit, thereby improving safety.

  The ventilation fan 11 provided with the DC brushless motor 1 can be used for ventilation in a high humidity atmosphere. An example of the high humidity atmosphere is air in the bathroom.

  In the above description, the packing material 33 has a shape that abuts only on a portion around the notch 16b of the top plate 16, but an annular portion similar to the cover flange 8a and a tongue piece protruding from the annular portion. The tongue piece may block the notch 16. By configuring the packing material 33 in this way, it is possible to prevent air from leaking from the gap between the top plate 16 and the cover 8.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1 DC brushless 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 Substrate, 11 Ventilation fan, 12 Body, 12a Air inlet, 12b Air outlet, 13 Blades, 14 Ceiling plate, 15 Grill, 16 Top plate, 16a Motor mounting hole, 16b Notch, 30 center axis, 31 magnetic sensor, 32 lead wire, 33 packing material, 33a lead wire insertion hole, 41 screw, 50 housing, 51 motor part, 52 circuit part.

Claims (4)

A frame having a bottomed cylindrical shape and provided with a frame flange at the opening edge, and a frame having a bottomed cylindrical shape and provided with a cover flange at the opening edge, wherein the frame flange and the cover flange are A housing formed by a cover combined with the frame to fit together;
A cylindrical stator installed inside the frame;
A rotor disposed inside the stator;
A shaft coupled to the rotor;
A bracket flange sandwiched between the frame flange and the cover flange, the inside of the housing is divided into the frame side and the cover side, and a bracket for rotatably holding the shaft;
A circuit for controlling the rotor, and a substrate installed in a space between the bracket and the cover;
A lead wire that is drawn into the housing through a through-hole provided in the cover and supplies power to the substrate;
An annular portion that contacts the cover flange, and a tongue piece portion that protrudes outward from the annular portion and has a lead wire insertion hole into which the lead wire is inserted, and is installed on the cover flange. An electric motor comprising a packing material.   The electric motor according to claim 1, wherein the lead wire is inserted into the lead wire insertion hole by expanding the lead wire insertion hole. The electric motor according to claim 1 or 2,
Blades connected to the shaft;
A body that houses the blades therein,
The body has a box shape including a motor mounting hole through which the cover can pass and a top plate formed with a notch cut out at an edge of the motor mounting hole .
The electric motor is inserted into the motor mounting hole from the cover side so that the cover protrudes above the top plate,
The lead wire is routed through the notch;
The packing material is sandwiched between the top plate and the cover flange, and the annular portion seals a gap between the top plate and the cover flange at a portion of the motor mounting hole, and the tongue piece A ventilation fan characterized by sealing a gap between the top plate and the cover flange at the notch portion .   A frame having a bottomed cylindrical shape and provided with a frame flange at the opening edge, and a frame having a bottomed cylindrical shape and provided with a cover flange at the opening edge, wherein the frame flange and the cover flange are A housing formed by a cover combined with the frame to fit together;
  A cylindrical stator installed inside the frame;
  A rotor disposed inside the stator;
  A shaft coupled to the rotor;
  A bracket flange sandwiched between the frame flange and the cover flange, the inside of the housing is divided into the frame side and the cover side, and a bracket for rotatably holding the shaft;
  A circuit for controlling the rotor, and a substrate installed in a space between the bracket and the cover;
  A lead wire that is drawn into the housing through a through-hole provided in the cover and supplies power to the substrate;
  An electric motor having a lead wire insertion hole into which the lead wire is inserted, and a packing material installed on the cover flange;
  Blades connected to the shaft;
  A body that houses the blades therein,
  The body has a box shape including a top plate formed with a motor mounting hole through which the cover can pass.
  The electric motor is inserted into the motor mounting hole from the cover side so that the cover protrudes above the top plate,
  The packing fan is sandwiched between the top plate and the cover flange, and seals a gap between the top plate and the cover flange.

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