JPWO2015037110A1 - Brushless DC motor and air conditioner using the same - Google Patents

Abstract

The brushless DC motor has a permanent magnet, a rotor attached to a rotating shaft, a hollow portion that rotatably accommodates the rotor, and a stator in which a plurality of coils are arranged on an inner peripheral surface facing the rotor, A sensor substrate having a magnetic sensor that faces the rotor in the axial direction and detects a rotational position of the rotor, one end fixed to the stator, and the other end extending in the radial direction from the inner peripheral side of the stator, And a substrate fixture for holding the sensor substrate so that the mounting surface of the magnetic sensor faces the permanent magnet of the rotor.

Description

  The present invention relates to a brushless DC motor provided with a magnetic sensor for detecting the rotational position of a rotor.

  Conventionally, a brushless DC motor in which a rotor (rotor) to which a permanent magnet is attached is accommodated in a stator (stator) around which a coil is wound is known. In this brushless DC motor, for example, a magnetic sensor composed of a Hall element or the like is arranged so as to face the rotor in a state where it is mounted on a printed circuit board, and the magnetic sensor detects the magnetic flux of the rotor and detects the rotational position. It has become.

  Here, various methods have been proposed as a method of arranging a sensor substrate on which a magnetic sensor is mounted in a stator (for example, see Patent Documents 1 and 2). Patent Document 1 discloses a brushless DC motor in which a sensor substrate is attached to a motor end bracket. Patent Document 2 discloses a brushless DC motor in which a printed circuit board is directly fixed to the upper end of a stator core.

JP 2008-54390 A JP 2000-41371 A

  When the magnetic sensor and the printed circuit board are exposed to the rotor as in Patent Documents 1 and 2, there is a possibility that moisture enters the inside of the stator and causes a problem. In particular, when a brushless DC motor is used in an outdoor unit of an air conditioner installed outdoors, there is a possibility that rainwater may enter and cause problems.

  The present invention has been made to solve the above-described problems, and provides a brushless DC motor that prevents adhesion of rain water or dew condensation water to a sensor substrate and prevents deterioration and short-circuit damage of the substrate. Objective.

  The brushless DC motor of the present invention includes a permanent magnet, a rotor attached to a rotating shaft, a hollow portion that rotatably accommodates the rotor, and a plurality of coils arranged on an inner peripheral surface facing the rotor. A stator, a sensor substrate having a magnetic sensor that faces the rotor in the axial direction and detects the rotational position of the rotor, and a shape in which one end is fixed to the stator and the other end extends in the radial direction from the inner peripheral side of the stator And a board fixture for holding the sensor board so that the magnetic sensor faces the permanent magnet of the rotor.

  In the brushless DC motor of the present invention, since the mounting surface of the sensor substrate is held in a state covered with the substrate fixture, the sensor substrate is protected from moisture such as rainwater that has entered the stator, and the substrate is deteriorated and short-circuited. Can be prevented.

It is a schematic diagram which shows Embodiment 1 of the brushless DC motor of this invention. It is a top view which shows an example of the sensor board | substrate of FIG. It is a perspective view which shows an example of the board | substrate fixture of FIG. It is a top view which shows an example of the board | substrate fixture of FIG. It is a perspective view which shows an example of the board | substrate fixture of FIG. It is a schematic diagram which shows Embodiment 2 of the brushless DC motor of this invention. It is a schematic diagram which shows Embodiment 3 of the brushless DC motor of this invention. It is a schematic diagram which shows Embodiment 4 of the brushless DC motor of this invention.

Embodiment 1. FIG.
Hereinafter, embodiments of the brushless DC motor of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing Embodiment 1 of a brushless DC motor of the present invention, and the brushless DC motor 1 will be described with reference to FIG. The brushless DC motor 1 is used as a rotational drive source of a blower attached to an outdoor unit of an air conditioner, for example. The brushless DC motor 1 includes a stator 3, a rotor 2, a sensor substrate 10, and a substrate fixture 20.

  The rotor 2 includes a shaft 2A rotatably held by the stator 3, a columnar rotor core 2B fixed to the shaft 2A, and a plurality of permanent magnets 2C attached to the outer peripheral side of the rotor core 2B. . The shaft 2A is rotatably supported with respect to the stator 3 by bearings or the like at both ends, and a cylindrical rotor core 2B is fixed to the shaft 2A. A plurality of permanent magnets 2C are attached to the outer periphery of the rotor core 2B, and the plurality of permanent magnets 2C are arranged so that the polarities are alternated in the rotation direction.

  The stator 3 has a hollow portion that accommodates the rotor 2 therein, and has a structure in which a plurality of coils 3A are arranged on the inner peripheral surface side. The stator 3 has a structure in which a plurality of coils 3A are wound around a cylindrical stator core, and the outer peripheral side of the stator core is resin-molded. That is, the stator 3 is formed in a bottomed cylindrical shape, and the end bracket 4 is attached to the opening side.

  FIG. 2 is a schematic diagram illustrating an example of the sensor substrate 10 of FIG. 1, and the sensor substrate 10 will be described with reference to FIGS. 1 and 2. The sensor substrate 10 is a substrate on which a magnetic sensor 11 that detects the rotational position of the rotor 2 is mounted, and is disposed so as to face each other in the axial direction (arrow Z direction) of the rotor 2. The sensor substrate 10 is made of, for example, a printed circuit board, and a magnetic sensor 11 that detects the rotational position of the rotor 2 is mounted on the mounting surface 10A side. The magnetic sensor 11 is composed of, for example, a Hall element, and detects the rotational position of the rotor 2 by detecting the magnetic flux of the permanent magnet 2 </ b> C of the rotor 2. The sensor board 10 is held by the board fixture 20, and has a notch 13 for positioning when attached to the board fixture 20, and an insertion hole 12 for fixing to the board fixture 20. have.

  1 is formed such that one end side is fixed to the stator 3 and the other end side extends in the radial direction of the rotor 2. The substrate fixture 20 holds the sensor substrate 10 so that the mounting surface 10A of the magnetic sensor 11 on the sensor substrate 10 faces the permanent magnet 2C of the rotor 2. 3 is a perspective view showing an example of the board fixture of FIG. 1, FIG. 4 is a plan view showing the other side of the board fixture of FIG. 1, and FIG. 5 is a side of the board fixture of FIG. It is a perspective view shown. The substrate fixture 20 of FIGS. 3 to 5 is made of, for example, a resin excellent in heat resistance and insulation, and includes a fixing portion 21, a step portion 22, and a substrate attachment portion 23.

  The fixed portion 21 is fixed to the inner peripheral side of the stator 3, and is formed in an arc shape so that the outer periphery follows the shape of the stator 3. The fixing portion 21 has a mounting hole 21A and a positioning hole 21B formed in a circular shape. 3 to 5 exemplify a case where two mounting holes 21A and two positioning holes 21B are formed. On the other hand, on the contact surface of the stator 3, a columnar first protrusion 3P inserted into each mounting hole 21A and a second protrusion for fixing the columnar fixing portion 21 inserted into each positioning hole 21B. 3Q is provided. The first protrusion 3P has a length such that the tip protrudes from the attachment hole 21A when inserted into the attachment hole 21A.

  When the fixing portion 21 is fixed to the stator 3, the first protrusion 3P is inserted into each mounting hole 21A, and the second protrusion 3Q is inserted into each positioning hole 21B. Thereafter, the tip end of the first protrusion 3 </ b> P protruding from the attachment hole 21 </ b> A is thermally crimped, and the board attachment 20 is fixed to the stator 3. In addition, although the case where the board fixture 20 is fixed to the stator 3 by heat caulking is illustrated, a known technique such as ultrasonic welding, screwing, or adhesion may be used.

  The step portion 22 is formed so as to extend in the axial direction from the fixed portion 21 along the inner periphery of the stator 3 to the rotor 2 side. That is, a step is formed in the axial direction (arrow Z direction) between the fixed portion 21 and the substrate mounting portion 23 so that the substrate mounting portion 23 approaches the rotor 2 side. The step portion 22 has an outer periphery formed in an arc shape along the shape of the stator 3.

  The board attaching part 23 has a shape extending in the radial direction (arrow β direction) from the step part 22 toward the axis 2A, and the sensor board 10 is attached to the board attaching part 23. The substrate mounting portion 23 is formed so that the length in the rotation direction (arrow α direction) is longer than the length in the radial direction (arrow β direction), and has a larger area than the outer shape of the sensor substrate 10. Yes. As for the board | substrate attaching part 23, the one surface 23A side is facing the rotor 2, and the sensor board | substrate 10 is attached to the other surface 23B side. Therefore, the sensor substrate 10 faces the rotor 2 through the substrate attachment portion 23.

  On the other surface 23B side of the board attachment portion 23, a frame body 24, a base 25, an insertion pin 26, and a rib 27 are formed. The frame body 24 is provided along the periphery of the board mounting portion 23, and is provided on the other surface 23 </ b> B side of the board mounting portion 23 so as to surround the side surface of the sensor substrate 10. That is, the substrate mounting portion 23 is formed with a recess for accommodating the sensor substrate 10 by the frame body 24. The pedestal 25 is for mounting the sensor substrate 10, and protrudes from the other surface 23 </ b> B side, and a portion in contact with the sensor substrate 10 is formed in a flat shape. The pedestal 25 is formed at the center of the other surface 23B and both ends in the longitudinal direction (arrow α direction).

  The insertion pin 26 is inserted into the insertion hole 12 of the sensor substrate 10 and has a cylindrical shape. A plurality of insertion pins 26 are provided. For example, two insertion pins 26 are provided at both ends in the rotation direction (arrow α direction). The insertion pins 26 are provided so as to correspond to the number and arrangement position of the insertion holes 12 of the sensor substrate 10. The ribs 27 prevent warping of the board mounting portion 23 during resin molding, and are formed to extend from the board mounting portion 23 along the stepped portion 22. Although the case where the substrate mounting portion 23 is kept horizontal by the ribs 27 is illustrated, for example, the pedestal 25 may have a shape inclined in advance in accordance with warpage from the viewpoint of cost reduction or the like. Good.

  The sensor substrate 10 is attached to the substrate attachment portion 23 so that the mounting surface 10A of the magnetic sensor 11 faces the substrate attachment portion 23. At this time, the insertion pin 26 is inserted into the insertion hole 12 and the notch 13 is fitted into the rib 27, whereby the sensor substrate 10 is accurately attached to the predetermined position of the substrate mounting portion 23 at the predetermined position. The sensor board 10 is fixed to the board mounting portion 23 by thermally crimping the tip of the insertion pin 26. In addition, although the case where the insertion pin 26 is fixed by heat crimping is illustrated, a known method such as ultrasonic welding, screwing, or adhesion may be used. Then, the substrate fixture 20 to which the sensor substrate 10 is fixed is fixed to the stator 3 as described above, and the magnetic sensor 11 of the sensor substrate 10 detects the magnetic flux of the rotor 2 to detect the rotational position. become able to.

  Note that the interval between the two insertion pins 26 (the interval between the plurality of insertion holes 12) desirably has a length of 50% or more of the length in the longitudinal direction of the sensor substrate 10. Thereby, the sensor substrate 10 can be reliably fixed to the substrate mounting portion 23.

  Further, as described above, when the mounting surface 10A of the sensor substrate 10 is fixed so as to face the substrate mounting portion 23, a lead component such as a connector on the mounting surface 10A may interfere with the substrate mounting portion 23. . Therefore, a groove 28 is provided in the board mounting portion 23 so that a lead component such as a connector does not contact the board mounting tool 20. Note that the groove 28 may not be formed when the lead component does not interfere with the board mounting portion 23.

  As described above, when the sensor substrate 10 is attached to the substrate fixture 20, the mounting surface 10 </ b> A of the sensor substrate 10 is covered with the substrate attachment portion 23, and the sensor substrate against moisture entering the stator 3. 10 mounting surface 10A is not exposed. For this reason, moisture does not adhere to the sensor substrate 10, and problems due to corrosion or short-circuiting of the sensor substrate 10 can be prevented. In particular, since the frame body 24 is provided, it is possible to block the water ingress path from the side surfaces of the sensor substrate 10 and the substrate mounting portion 223, so that the moisture adheres to the mounting surface 10A of the sensor substrate 10 with certainty. Can be prevented.

  Furthermore, the sensor substrate 10 on which the magnetic sensor 11 is mounted can be easily attached with high positional accuracy simply by fixing the substrate fixture 20 to the first protrusion 3P of the stator 3 molded with resin by heat caulking or the like. The structure is also good. Further, since the sensor substrate 10 is prevented from adhering moisture without being molded with resin, the air permeability can be improved.

  In addition, since the board fixture 20 in a state of covering and fixing the mounting surface 10A during the assembly work is attached to the stator 3, the work efficiency at the time of board installation can be improved. That is, it is necessary to accurately position the sensor substrate 10 with respect to the rotor 2 within the constraint conditions such as the shape of the sensor substrate 10 and the shape of the stator 3 and the shape of the end bracket 4. For this reason, the mounting position of the sensor substrate 10 is limited, and it is necessary to work while paying attention to contact with the magnetic sensor 11 at the time of manufacturing the motor, which may deteriorate the efficiency of the assembly work. On the other hand, by using the substrate mounting tool 20 described above, it is possible to improve work efficiency when mounting the sensor substrate 10 while ensuring the mounting position accuracy of the magnetic sensor 11.

Embodiment 2. FIG.
FIG. 6 is a schematic diagram showing a brushless DC motor according to a second embodiment of the present invention. The brushless DC motor 100 will be described with reference to FIG. In addition, in the brushless DC motor 100 of Embodiment 2, the part which has the same structure as the brushless DC motor 1 of FIGS. 1-5 is attached | subjected with the same code | symbol, and the description is abbreviate | omitted. The brushless DC motor 100 shown in FIG. 6 is different from the brushless DC motor shown in FIGS. 1 to 5 in that the substrate fixture 20 is attached to the stator 3 via the position adjusting member 101.

  The position adjusting member 101 adjusts the positional relationship between the rotor 2 and the magnetic sensor 11 in the height direction, and is composed of, for example, a sandwich plate made of a resin excellent in heat resistance and insulation. The position adjustment member 101 is stable against vibration and has a sufficiently large area so as not to affect the detection of the rotational position. For example, the position adjustment member 101 is fixed to the stator 3 by heat caulking. The fixing method of the position adjusting member 101 is not limited to thermal caulking, and can be fixed by a known method such as ultrasonic welding, screwing, or adhesion. The position adjustment member 101 may have a single plate structure, or may have a shape arbitrarily divided in accordance with the shapes of the stator 3 and the board fixture 20 in the rotation direction (arrow α direction). You may have.

  And the installation position of the sensor board | substrate 10 is adjusted by adjusting the thickness of the axial direction (arrow Z direction) of the position adjustment member 101. FIG. At this time, the thickness of the position adjustment member 101 may be increased or decreased by increasing or decreasing the number of the position adjustment members 101, or a plurality of types of position adjustment members 101 having different thicknesses are prepared in advance, and the thickness most suitable. The position adjusting member 101 may be attached. Thereby, the position in the axial direction (arrow Z direction) of the sensor substrate 10 having the magnetic sensor 11 at a position where there is no contact with the rotor 2 and the leakage magnetic flux from the permanent magnet 2C of the rotor 2 can be sufficiently detected. The position can be adjusted.

  Thus, since the height of the board | substrate fixture 20 can be adjusted, it can attach to the position which can fully detect the leakage magnetic flux of the sensor board | substrate 10 and the permanent magnet 2C. Further, similarly to the first embodiment, the sensor substrate 10 can prevent moisture from adhering to the substrate fixture 20, and can prevent problems such as deterioration of the substrate and short circuit damage.

Embodiment 3. FIG.
FIG. 7 is a schematic diagram showing a brushless DC motor according to a third embodiment of the present invention. The brushless DC motor will be described with reference to FIG. In the brushless DC motor of FIG. 7, parts having the same configuration as those of the brushless DC motor of FIGS. 1 to 5 are denoted by the same reference numerals and description thereof is omitted. The brushless DC motor 200 of FIG. 7 is different from the brushless DC motor of FIGS. 1 to 5 in that the sensor substrate 10 is mounted on the substrate fixture 20 so as to face the rotor 2 directly.

  In FIG. 7, the substrate attachment portion 223 of the substrate attachment 220 has a configuration in which an attachment surface for attaching the sensor substrate 10 is formed on one surface side facing the rotor 2. At this time, the board mounting portion 223 is provided with the pedestal 25 and the insertion pin 26 on the one surface 23A side facing the rotor 2, and the sensor board 10 is attached to the board mounting portion 223 by the above-described thermal caulking or the like. Will be attached. Further, the board mounting portion 223 fixes one end side of the sensor board 10 and does not fix the other end side, and is in a state of facing a part of one end side of the mounting surface 10A of the sensor board 10. ing.

  The sensor substrate 10 is a single-sided mounting substrate, and is mounted so that the mounting surface 10A on which the substrate mounting tool 220 is mounted faces the substrate mounting portion 223. The magnetic sensor 11 detects the rotational position of the rotor 2 by detecting the leakage magnetic flux that has passed through the sensor substrate 10 from the rotor 2.

  As described above, the sensor substrate 10 is composed of a single-sided mounting substrate and is attached to the substrate fixture 220 so that the non-mounting surface side faces the rotor 2, so that the sensor substrate 10 enters the mounting surface 10 </ b> A of the sensor substrate 10 from above. It is possible to prevent adhesion of moisture. In addition, since it is not necessary for the substrate fixture 220 to cover the entire sensor substrate 10, the amount of resin used when the substrate fixture 220 is molded can be reduced, and the resin molding shape of the fixture can be simplified.

  7 illustrates the case where the board fixture 220 is directly attached to the stator 3. However, as shown in FIG. 6, the stator is interposed via a position adjusting member 101 for adjusting the height position. 3 may be attached. 7 illustrates the case where the substrate fixture 220 is fixed on one end side of the sensor substrate 10, but may be fixed on both ends of the sensor substrate 10 as in FIG. At this time, the base 25, the insertion pin 26, and the rib 27 may be provided on the board mounting portion 223.

Embodiment 4 FIG.
FIG. 8 is a schematic view showing Embodiment 4 of the brushless DC motor of the present invention, and the brushless DC motor 300 will be described with reference to FIG. In addition, in the brushless DC motor 300 of FIG. 8, the same code | symbol is attached | subjected to the site | part which has the same structure as the brushless DC motor 1 of FIG. 1, and the description is abbreviate | omitted. The brushless DC motor 300 in FIG. 8 is different from the brushless DC motor 1 in FIG. 1 in that the board attachment 320 is attached to the upper surface side of the stator 3.

  8 is fixed to the wall surface 3C of the stator 3, and fixed portions 321 are provided at both ends of the substrate mounting portion 323 to which the sensor substrate 10 is attached. Further, the fixing portion 321 and the substrate attachment portion 323 are provided with a stepped portion 322 to prevent moisture from entering from the side surface of the sensor substrate 10. The sensor substrate 10 and the substrate fixture 320 are fixed by inserting the insertion pin 26 into the above-described insertion hole 12 and performing heat caulking or the like.

  Even in such a case, it is possible to prevent moisture from adhering to the sensor substrate 10 in the stator 3 against moisture such as rainwater. In FIG. 8, the case where the fixture is directly attached to the stator is illustrated. However, as in the second embodiment, the fixture 3 is attached to the stator 3 via the position adjustment member 101 for adjusting the height position. It may be attached.

  As described above, according to each of the first to fourth embodiments, when the sensor substrate 10 is installed using the substrate fixtures 20, 220, and 320, it is possible to prevent moisture from adhering to the mounting surface 10A. Occurrence of defects such as corrosion and short circuit due to adhesion can be prevented. In particular, when the sensor substrate 10 is covered with the substrate fixtures 20 and 320, the contact between the sensor substrate 10 and the rotor 2 due to the displacement of the position of the rotor 2 when the motor arrangement state is reversed upside down. 320 can prevent this.

  Embodiment of this invention is not limited to the said Embodiment 1-4. For example, in FIGS. 2 to 4, the case where the fixing portion 21 is fixed to the stator 3 is illustrated, but the step portion 22 may be fixed to the inner peripheral side surface of the stator 3. At this time, the step portion 22 functions as the fixing portion 21, and the attachment hole 21 </ b> A and the positioning hole 21 </ b> B are formed in the step portion 22.

  Moreover, although the case where the shape of the mounting hole 21A is formed in a circular shape is illustrated, in order to increase the positional accuracy, a shape other than a circle such as a triangle or a quadrangle may be used. Moreover, although the case where the number of 21 A of attachment holes is provided is illustrated, one may be sufficient and two or more may be sufficient.

  Furthermore, although the case where the brushless DC motor 1 is used as a fan motor of an outdoor unit in an air conditioner is illustrated, it can be applied to other motors installed outdoors (natural environment).

  1, 100, 200, 300 Brushless DC motor, 2 rotor, 2A shaft, 2B rotor core, 2C permanent magnet, 3 stator, 3A coil, 3C wall surface, 3P first protrusion, 3Q second protrusion, 4 end bracket, 10 Sensor board, 10A mounting surface, 11 Magnetic sensor, 12 Insertion hole, 13 Notch, 20, 220, 320 Substrate fixture, 21, 321 Fixing part, 21A Mounting hole, 21B Positioning hole, 22, 322 Step part, 23, 223, 323 Substrate mounting portion, 23A One surface, 23B Other surface, 24 Frame body, 25 Base, 26 Insertion pin, 27 Rib, 28 Groove, 101 Position adjustment member, Z axis direction, α rotation direction, β radial direction.

The brushless DC motor of the present invention includes a permanent magnet, a rotor attached to a rotating shaft, a hollow portion that rotatably accommodates the rotor, and a plurality of coils arranged on an inner peripheral surface facing the rotor. A stator, a sensor substrate having a magnetic sensor that faces the rotor in the axial direction and detects the rotational position of the rotor, and a shape in which one end is fixed to the stator and the other end extends in the radial direction from the inner peripheral side of the stator the a, possess a substrate fixture magnetic sensor holds the sensor substrate so as to face the permanent magnet of the rotor, the substrate fixture includes a fixed portion fixed to the inner peripheral side of the stator, from the fixed portion A step portion extending in the axial direction toward the rotor side along the inner periphery of the stator, a substrate attachment portion having a shape extending radially from the step portion toward the rotation center, and having a plurality of insertion pins attached thereto, and substrate attachment Part And a plurality of ribs disposed along the stepped section to the fixing section, the sensor substrate is perforated with a plurality of insertion holes corresponding to the plurality of insertion pins, and a plurality of cutout portions corresponding to the plurality of ribs.

Claims (13)

A rotor equipped with a permanent magnet and attached to a rotating shaft;
A stator having a hollow portion for rotatably accommodating the rotor, and a plurality of coils disposed on an inner peripheral surface facing the rotor;
A sensor substrate having a magnetic sensor facing the rotor in the axial direction and detecting a rotational position of the rotor;
One end is fixed to the stator and the other end has a shape extending in a radial direction from the inner peripheral side of the stator, and the sensor substrate is held so that the magnetic sensor faces the permanent magnet of the rotor A brushless DC motor, comprising: The stator has a protruding portion that protrudes from a facing surface facing the rotor,
The board fixture includes a through hole into which the protrusion is inserted,
2. The brushless DC motor according to claim 1, wherein the substrate fixture is fixed to the stator by heat caulking in a state where the protrusion is inserted into the through hole. An insertion pin is formed on the board fixture,
The sensor board is provided with an insertion hole for inserting the insertion pin,
3. The brushless DC motor according to claim 1, wherein the sensor substrate is fixed to the substrate fixture by thermal caulking in a state where the insertion pin is inserted into the insertion hole. 4. The board fixture has a plurality of the insertion pins,
The sensor substrate has a plurality of the insertion holes corresponding to the plurality of insertion pins,
4. The brushless DC according to claim 3, wherein an interval between the insertion pins that are farthest from each other among the plurality of insertion pins has a length that is 50% or more of a length in a longitudinal direction of the sensor substrate. motor.   The brushless DC motor according to any one of claims 1 to 4, wherein the board fixture holds the sensor board so as to face the entire sensor board.   The brushless DC motor according to claim 1, wherein the board fixture has a frame body that surrounds a side surface of the sensor board. The substrate fixture is
A fixed portion fixed to the inner peripheral side of the stator;
A stepped portion extending in the axial direction from the fixed portion to the rotor side along the inner periphery of the stator;
The brushless according to any one of claims 1 to 6, further comprising: a substrate mounting portion having a shape extending in a radial direction from the stepped portion toward a rotation center and to which the sensor substrate is mounted. DC motor. The substrate fixture is made of a resin having heat resistance and insulation,
The brushless DC motor according to claim 7, wherein a rib is provided along the step portion from the substrate mounting portion.   9. The brushless DC motor according to claim 7, wherein the substrate mounting portion is provided with a groove at a position facing a lead portion of a wiring connector led from outside to the magnetic sensor.   The brushless DC motor according to any one of claims 1 to 9, wherein the substrate fixture is fixed to the stator via a position adjustment member that adjusts an axial position of the sensor substrate. .   2. The brushless DC motor according to claim 1, wherein the sensor substrate is formed of a single-sided mounting substrate, and is attached to the substrate fixture such that a non-mounting surface side faces the rotor.   The brushless DC motor according to claim 1, wherein the substrate fixture and the sensor substrate are attached to a wall surface extending in a radial direction of the stator.   The air conditioning apparatus which mounts the brushless DC motor of any one of Claims 1-12.

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