JP2014039420A - Motor, method for manufacturing motor, and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor in which electrolytic corrosion of a bearing is suppressed by an inexpensive method.SOLUTION: A motor includes: a stator forming a coil by being wound around an iron core constructed of a plurality of teeth; a rotor in which magnets arranged in an outer periphery of a shaft are integrated by resin parts and a rolling bearing are provided at both ends in an axial direction of the shaft, respectively; and a bracket which supports one rolling bearing of the rotor. The bracket comprises: a metallic press-in component which is pressed-in the stator; a metallic bearing support component which supports the rolling bearing; and a coupling part having insulation properties which couples the bearing support component and the press-in component.

Description

  The present invention relates to an electric motor that uses a rolling bearing and is driven by an inverter. Moreover, it is related with the manufacturing method of the electric motor, and the air conditioner carrying the electric motor.

  Conventionally, when an electric motor is driven by an inverter, the carrier frequency of the inverter is set to be high for the purpose of reducing the noise of the electric motor generated due to switching of the transistors in the power circuit. As the carrier frequency is set higher, the shaft voltage generated on the motor shaft based on the high frequency induction increases, and the potential difference existing between the inner ring and the outer ring of the rolling bearing supporting the shaft increases. The current easily flows through the rolling bearing. The current flowing through the rolling bearings causes corrosion called electrolytic corrosion on the rolling surfaces of the inner and outer ring raceways and the rolling elements (balls and rollers that roll between the inner and outer rings), thereby deteriorating the durability of the rolling bearings. There was a problem.

  Therefore, in order to obtain an electric motor that is easy to assemble with a simple configuration that prevents current from flowing through the rolling bearing provided between the shaft and the motor case and prevents electric corrosion from occurring in the rolling bearing. A stator around which a coil is wound, a frame for fixing the stator, a rotor facing the stator with a slight gap, and the rotor are fixed, and can be freely rotated via a rolling bearing. In an electric motor having a shaft to be supported and a bearing bracket that supports a rolling bearing via an insulating material, a concave portion is provided on the side of the bearing bracket that contacts the insulating material, and a convex portion corresponding to the concave portion of the bearing bracket is provided. There has been proposed an electric motor in which a convex portion of an insulating material is fitted and fixed to a concave portion of a bearing bracket (for example, see Patent Document 1).

  In addition, in an electrolytic corrosion prevention type rolling bearing in which an insulating coating is formed on the inner ring fitting surface or the outer ring fitting surface of the rolling bearing, or both the inner ring fitting surface and the outer ring fitting surface, the peripheral surface of the inner ring fitting surface or the outer ring fitting surface. An electro-corrosion-preventing type rolling bearing has been proposed in which the boundary surface between the peripheral surface and the chamfered portion exhibits a loosely tapered surface or an arc surface having a large curvature radius, and at least one fitting surface has an insulating coating of an inorganic compound by thermal spraying. (For example, refer to Patent Document 2).

JP 2000-156952 A JP 59-103023 A

  However, the electric motor disclosed in Patent Document 1 has a concave portion provided on the side of the bearing bracket that contacts the insulating material, and the convex portion of the insulating material provided with a convex portion corresponding to the concave portion of the bearing bracket is fitted into the concave portion of the bearing bracket. However, since it is configured to be fixed, it is easy to assemble with a simple configuration, but on the other hand, there is a problem that it is easily detached from the insulating material from the bearing bracket.

  Further, the electric corrosion prevention type rolling bearing of Patent Document 2 has a loose tapered surface or an arc surface having a large curvature radius at the peripheral surface of the inner ring fitting surface or the boundary surface between the peripheral surface of the outer ring fitting surface and the chamfered portion, at least. On the other hand, since an insulating coating of an inorganic compound is formed by thermal spraying on the fitting surface, there is a problem that the cost increases.

  The present invention has been made to solve the above-described problems, and has an object to provide an inexpensive motor that is easy to assemble and that suppresses electrolytic corrosion of a bearing, a method for manufacturing the motor, and an air conditioner. To do.

  In the electric motor according to the present invention, a resin portion is used to integrate a stator wound around an iron core composed of a plurality of teeth to form a coil and a magnet disposed on the outer periphery of the shaft. A rotor provided with rolling bearings at both ends, and a bracket that supports one of the rolling bearings of the rotor, wherein the bracket is a metal press-fitting component that is press-fitted into the stator; and the rolling bearing. It comprises a metal bearing support part that supports the bearing, and an insulative connecting part that connects the bearing support part and the press-fitting part.

  In the electric motor according to the present invention, the bracket is a metal press-fitting part that is press-fitted into the stator, a metal bearing support part that supports the bearing, and an insulation that connects the bearing support part and the press-fitting part. By forming the connecting portion having the property, the occurrence of electrolytic corrosion is suppressed and the quality can be improved.

FIG. 3 shows the first embodiment and is a cross-sectional view of the electric motor 100. FIG. 3 shows the first embodiment and is a cross-sectional view of the mold stator 10. FIG. 5 shows the first embodiment, and is a perspective view of a stator 40. FIG. 3 shows the first embodiment and is a cross-sectional view of a rotor 20. FIG. 5 shows the first embodiment, and is a cross-sectional view of the rotor 20-1 from which a load-side rolling bearing 21a and an anti-load-side rolling bearing 21b are removed. Fig. 5 shows the first embodiment, and is a side view of the rotor 20-1 viewed from the load side. FIG. 4 is a diagram showing the first embodiment, and is an enlarged cross-sectional view of the end portion on the counterload side of the rotor 20 with the rolling bearing removed. FIG. 5 shows the first embodiment, and is an enlarged cross-sectional view of an end portion on the counterload side of the rotor 20. FIG. 3 is a diagram illustrating the first embodiment and is a diagram illustrating a resin magnet 22 of a rotor ((a) is a left side view, (b) is a CC cross-sectional view of (a), and (c) is a right side view). FIG. 3 is a diagram illustrating the first embodiment and is a diagram illustrating a position detection magnet 25 ((a) is a left side view, (b) is a front view, and (c) is an enlarged view of a D part in (b)). FIG. 3 is a diagram illustrating the first embodiment and is a diagram illustrating a bracket 30 ((a) is a cross-sectional view, and (b) is a side view). FIG. 3 is a diagram illustrating the first embodiment and is a diagram illustrating a press-fitting component 31 ((a) is a side view, (b) is a cross-sectional view). FIG. 3 is a diagram illustrating the first embodiment and is a diagram illustrating a bearing support component 32 ((a) is a cross-sectional view, and (b) is a side view). FIG. 5 is a diagram illustrating the first embodiment and is a diagram illustrating the connecting component 33 ((a) is a left side view, (b) is a cross-sectional view, and (c) is a right side view). FIG. 5 shows the first embodiment, and is a perspective view showing assembly of the bracket 30. FIG. FIG. 5 shows the first embodiment, and is a partially enlarged sectional view of the bracket 30. FIG. FIG. 3 shows the first embodiment, and is a circuit diagram of a drive circuit 1 that drives an electric motor 100. FIG. 5 shows the first embodiment, and shows a manufacturing process of the bracket 30. FIG. 5 shows the second embodiment, and shows a bracket 300 ((a) is a cross-sectional view, (b) is a side view). FIG. 5 is a diagram illustrating the second embodiment and is a diagram illustrating a press-fitting component 301 ((a) is a side view, (b) is a cross-sectional view). FIG. 6 is a diagram illustrating the second embodiment and is a diagram illustrating a bearing support component 302 ((a) is a cross-sectional view, and (b) is a side view). FIG. 10 is a partial enlarged view cross-sectional view of the bracket 300, showing Embodiment 2. FIG. 5 shows the second embodiment, and is a cross-sectional view of an electric motor 100 using the bracket of the second embodiment. FIG. 5 shows the second embodiment, and shows a manufacturing process of the bracket 300. FIG. 5 shows the third embodiment and is a configuration diagram of an air conditioner 200. FIG.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to the drawings. First, the entire electric motor will be described, then the stator and rotor will be described, and then the bracket which is a feature of the present invention will be described.
FIG. 1 shows the first embodiment and is a cross-sectional view of an electric motor 100. An electric motor 100 shown in FIG. 1 includes a mold stator 10, a rotor 20 (defined as a rotor of the electric motor), and a bracket 30 to be described later attached to one end of the mold stator 10 in the axial direction. The electric motor 100 is, for example, a brushless DC motor having a permanent magnet in the rotor 20 and driven by an inverter.

  FIG. 2 is a diagram showing the first embodiment, and is a cross-sectional view of the mold stator 10. The mold stator 10 is open at one end in the axial direction (the right side in FIG. 2), and an opening 10b is formed here. The rotor 20 is inserted from this opening 10b. A hole 11a that is slightly larger than the diameter of the shaft 23 of the rotor 20 is formed in the other axial end portion of the mold stator 10 (left side in FIG. 2).

  Next, as shown in FIG. 1, the opening 10 b of the mold stator 10 is closed, and a bracket 30 that supports the anti-load side rolling bearing 21 b is press-fitted into the mold stator 10. The bracket 30 supports the anti-load-side rolling bearing 21b with a bearing support portion 32a (shown in FIG. 13) described later. The bracket 30 is press-fitted into the mold stator 10 with the press-fit portion 31b (shown in FIG. 12) having a substantially U-shaped cross section of the bracket 30 and the inner peripheral portion 10a (mold resin) of the mold stator 10. Part) is pressed into the opening 10b side.

  As shown in FIG. 2, the mold stator 10 includes a stator 40 and a mold resin 50 for molding. For the mold resin 50, for example, a thermosetting resin such as an unsaturated polyester resin is used. Since the stator 40 is attached with a substrate and the like which will be described later and has a weak structure, low pressure molding is desirable. Therefore, thermosetting resins such as unsaturated polyester resins are used.

FIG. 3 is a perspective view of the stator 40 showing the first embodiment. The stator 40 shown in FIG. 3 has the following configuration.
(1) An electromagnetic steel sheet having a thickness of about 0.1 to 0.7 mm is punched into a strip shape, and a strip-shaped stator core 41 is manufactured by laminating by caulking, welding, bonding, or the like. The strip-shaped stator core 41 includes a plurality of teeth (not shown). The inside of which concentrated coil 42 described later is applied is a tooth.
(2) The insulating portion 43 is applied to the teeth. The insulating portion 43 is formed integrally with or separately from the stator core 41 using, for example, a thermoplastic resin such as PBT (polybutylene terephthalate).
(3) Concentrated winding coil 42 is wound around the teeth provided with insulating portion 43. A plurality of concentrated winding coils 42 are connected to form, for example, a three-phase single Y-connection winding. However, distributed winding may be used.
(4) Since it is a three-phase single Y connection, a terminal 44 (power supply to which power is supplied) is connected to the connection side of the insulating portion 43 to the coil 42 of each phase (U phase, V phase, W phase). Terminal 44a and neutral point terminal 44b) are assembled. There are three power terminals 44a and three neutral point terminals 44b.
(5) The board | substrate 45 is attached to the insulation part 43 (side in which the terminal 44 is assembled | attached) on the connection side. A substrate 45 on which a lead wire lead-out component 46 that leads out the lead wire 47 is assembled is assembled to the insulating portion 43 to form the stator 40. The chamfered rectangular column 48 of the insulating part 43 formed in the stator core 41 is inserted into a rectangular column insertion hole (not shown) provided in the substrate 45, thereby positioning in the rotational direction and the insulating unit 43. The position in the axial direction is determined by installing the substrate 45 on the substrate installation surface (not shown). Further, by thermally welding the prisms 48 protruding from the substrate 45, the substrate 45 and the insulating portion 43 are fixed, and the portion protruding from the substrate 45 of the terminal 44 provided in the stator 40 is electrically soldered. Are also joined. On the substrate 45, an IC 49a (drive element) for driving the electric motor 100 (for example, a brushless DC motor), a Hall IC 49b (position detection element) for detecting the position of the rotor 20, and the like are mounted. IC 49a, Hall IC 49b, etc. are defined as electronic components.

  Next, the configuration of the rotor 20 will be described. 4 to 6 are views showing the rotor 20, FIG. 4 is a sectional view of the rotor 20, and FIG. 5 is a sectional view of the rotor 20-1 with the load side rolling bearing 21a and the anti-load side rolling bearing 21b removed. FIG. 6 is a side view of the rotor 20-1 viewed from the load side.

  As shown in FIGS. 4 and 5, the rotor 20 (or the rotor 20-1) includes a shaft 23 provided with a knurling 23a, a ring-shaped rotor resin magnet 22 (an example of a rotor magnet), A ring-shaped position detecting resin magnet 25 (an example of a position detecting magnet) and a resin portion 24 for integrally molding them.

  A resin magnet 22 of a ring-shaped rotor, a shaft 23, and a position detection resin magnet 25 are integrated by a resin portion 24 injected by a vertical molding machine. At this time, the resin part 24 is formed on the outer periphery of the shaft 23, and a central cylinder part 24g (formed inside the rotor resin magnet 22), which will be described later, and the rotor resin magnet 22 are arranged in the central cylinder part 24g. And a plurality of axial ribs 24j (see FIG. 6) formed radially in the radial direction around the shaft 23. A cavity 24k (see FIG. 6) penetrating in the axial direction is formed between the ribs 24j.

  As the resin used for the resin portion 24, a thermoplastic resin such as PBT (polybutylene terephthalate) or PPS (polyphenylene sulfide) is used. Those in which a glass filler is blended with these resins are also suitable.

  The anti-load side rolling bearing 21b is attached to the anti-load side (right side in FIG. 4) of the shaft 23 (generally by press fitting). A load-side rolling bearing 21a is attached to the load side (left side in FIG. 4) of the shaft 23 to which a fan or the like is attached.

  Next, the structure of the end portion of the shaft of the rotor 20 will be described. 7 is an enlarged cross-sectional view of the end portion on the non-load side of the rotor 20 with the rolling bearing removed, and FIG. 8 is an enlarged cross-sectional view of the end portion on the anti-load side of the rotor 20.

  7 and 8, the resin portion 24 has a bearing contact surface 24 d that serves as an axial positioning when the shaft 23 of the anti-load side rolling bearing 21 b is inserted into the anti-load side end portion 23 d of the shaft 23. It is formed at the opposite end portion of the central cylindrical portion 24g (resin portion) of the resin portion 24 formed on the outer periphery centering on the knurled portion.

  The central cylindrical portion 24g of the resin portion 24 formed on the outer periphery with the knurled portion of the shaft 23 as the center in the axial direction has a stepped portion 24e between the outer peripheral portion of the central cylindrical portion 24g and the bearing contact surface 24d. Is provided.

  It is essential that the diameter of the stepped portion 24e is smaller than the inner diameter of the outer ring 21b-2 of the anti-load side rolling bearing 21b. In the rotor 20 shown in FIG. 4, the diameter (d3) of the stepped portion 24e shown in FIG. 8 is substantially the same as or slightly smaller than the outer diameter of the inner ring 21b-1 of the anti-load side rolling bearing 21b.

  Generally, a rolling bearing is provided with a cover between an outer ring and an inner ring so that grease does not leak out from the inside of the rolling bearing or dust does not enter from the outside. This cover is located inside the both end surfaces of the rolling bearing.

  Therefore, even if the diameter of the stepped portion 24e (d3) is larger than the outer diameter of the inner ring 21b-1 of the anti-load side rolling bearing 21b, the portion larger than the outer diameter of the inner ring 21b-1 is not anti-load side rolling. It does not contact the bearing 21b. Therefore, the diameter (d3) of the stepped portion 24e is practically the same as or slightly smaller than the outer diameter of the inner ring 21b-1 of the anti-load side rolling bearing 21b.

  By providing the stepped portion 24e, when the shaft 23, the resin magnet 22 of the rotor and the resin magnet 25 for position detection are integrally formed of resin, the bearing contact surface 24d of the central cylindrical portion 24g of the resin portion 24 can be In the case of forming, the step portion 24e is formed by the above-mentioned eroko. For this reason, the mating surface of the mold becomes the anti-load side end surface 24h of the central cylindrical portion 24g, so that even if burrs occur on the mating surface of the mold, the anti-load side rolling bearing 21b is the anti-load that becomes the mating surface of the mold. Since it is separated from the side end face 24h by the stepped portion 24e, the burr does not contact the anti-load side rolling bearing 21b. Therefore, there is little possibility of adversely affecting the anti-load side rolling bearing 21b.

  Further, when the rotor 20 receives a thermal shock, the central cylindrical portion 24g of the resin portion 24 may break. Even in such a case, the step portion 24e is provided in the central cylindrical portion 24g, the radial dimension of the step portion 24e is constant, and the diameter of the central cylindrical portion 24g between the step portions 24e (the load side and the anti-load side) at both ends. The thickness of the direction can be increased to cope with it.

  Since the diameter (d3) of the stepped portion 24e is smaller than the inner diameters of the outer rings 21a-2 and 21b-2 of the load side rolling bearing 21a and the anti-load side rolling bearing 21b, the central cylindrical portion 24g between the stepped portions 24e. The thickness in the radial direction can be larger than the inner diameters of the outer rings 21a-2 and 21b-2.

  9A and 9B are views showing the resin magnet 22 of the rotor. FIG. 9A is a left side view, FIG. 9B is a cross-sectional view taken along the line CC of FIG. 9A, and FIG. is there. The configuration of the resin magnet 22 of the ring-shaped rotor will be described with reference to FIG. In the rotor resin magnet 22, an axial end of the inner diameter (on the right side in FIG. 9B) is secured to ensure the coaxiality of the shaft 23 and the rotor resin magnet 22 during mold clamping during resin molding. The notch 22a is formed. In the example of FIG. 9, the notches 22a are formed at eight locations at substantially equal intervals in the circumferential direction (FIG. (C)).

  In addition, on the resin magnet 22 of the rotor, pedestals 22b for mounting the position detection resin magnet 25 are formed at substantially equal intervals in the circumferential direction on the end surface of the other axial end portion (left side in FIG. 9B). ing.

  The pedestal 22b is formed from the vicinity of the inner diameter of the resin magnet 22 of the rotor toward the outer diameter, and the positioning projection 22c is radially directed from the tip of the pedestal 22b toward the outer periphery of the resin magnet 22 of the rotor. It extends to. The positioning protrusions 22c are used for positioning the rotor resin magnet 22 in the circumferential direction (rotation direction) when the rotor magnet, the position detection magnet, and the shaft are integrally formed by the resin portion 24.

  Next, the configuration of the ring-shaped position detecting resin magnet 25 will be described with reference to FIG. FIG. 10A is a left side view of the position detecting resin magnet 25, FIG. 10B is a front view of the position detecting resin magnet 25, and FIG. 10C is an enlarged view of a portion D of FIG.

  The position detecting resin magnet 25 includes steps 25b at both axial end portions on the inner diameter side. The step 25b is necessary to prevent the position detecting resin magnet 25 from coming off in the axial direction by filling the step 25b on the axial end portion side of the rotor 20 with a part of the resin portion 24.

  In FIG. 10, the step provided with the step 25 b at both ends is shown, but the step 25 b may be provided at either one of the end portions, and it may be positioned on the axial end portion side of the rotor 20. However, when both ends are provided with a step 25b, the position detection resin magnet 25 is set without worrying about the front and back when the resin magnet 24 for position detection is set on the mold (lower mold) when the resin portion 24 of the rotor 20 is integrally formed. Excellent workability because it can.

  Further, the position detecting resin magnet 25 includes eight ribs 25a (substantially triangular in cross section) that are circumferentially detented when embedded in the resin portion 24 in the step 25b at substantially equal intervals in the circumferential direction. However, the number, shape, and arrangement interval of the ribs 25a may be arbitrary.

  As shown in FIG. 10, in the resin portion 24, a mold inner diameter pressing portion 24a for holding the inner diameter of the position detection resin magnet 25 and the position detection resin magnet 25 are set in a mold (lower mold). A taper part 24b for facilitating and a resin injection part 24c at the time of resin molding are formed after resin molding.

  The rotor resin magnet 22 is formed by mixing a thermoplastic material with a magnetic material. As shown in FIG. 9, the inner diameter is provided with a notch 22a tapered from one end surface in the axial direction. A pedestal 22b on which the position detecting resin magnet 25 is placed is provided on the other axial end surface opposite to one axial end surface.

  The pedestal 22b of the rotor resin magnet 22 formed integrally with the shaft 23 enables the position detection resin magnet 25 to be separated from the end surface of the rotor resin magnet 22, and the thickness of the position detection resin magnet 25 is increased. Can be disposed at an arbitrary position, and the cost can be reduced by filling a thermoplastic resin cheaper than the resin magnet 22 of the rotor.

  As shown in FIG. 10, the position detecting resin magnet 25 has steps 25b on both sides in the thickness direction, and ribs 25a that prevent rotation when embedded in the resin, on both steps 25b. Further, the coaxiality between the inner diameter of the position detecting resin magnet 25 and the outer diameter of the position detecting resin magnet 25 is made with high accuracy.

  When molded integrally with the shaft 23, the outer periphery of the position detection resin magnet 25 is filled with a taper-shaped resin (resin portion 24). Correspondingly, the resin to be filled is blocked by the axial end face (outer side) on one side of the position detection resin magnet 25 and the axial end faces of the rotor resin magnet 22, so that the outer diameter of the rotor resin magnet 22 is variable. It is possible to suppress the occurrence of the problem, and the quality is improved.

  Further, by arranging the gate port at the time of integral molding with the shaft 23 further inside than the inner diameter of the resin magnet 22 of the rotor and arranging the resin injection portion 24c in a convex shape, the concentration of pressure is alleviated, and the resin Can be easily filled, and the convex portion of the resin injection portion 24c can be used for positioning.

Next, the bracket according to Embodiment 1 of the present invention will be described in detail.
11 to 16 are views showing the first embodiment, FIG. 11 is a view showing the bracket 30, (a) is a cross-sectional view, and (b) is a side view. 12A and 12B are diagrams showing the press-fitting component 31, wherein FIG. 12A is a side view and FIG. 12B is a cross-sectional view. 13A and 13B are views showing the bearing support component 32, where FIG. 13A is a cross-sectional view and FIG. 13B is a side view. 14A and 14B are diagrams showing the connecting portion 33, where FIG. 14A is a left side view, FIG. 14B is a cross-sectional view, and FIG. 14C is a right side view. FIG. 15 is a perspective view showing the assembly of the bracket 30, and FIG. 16 is an enlarged cross-sectional view of the bracket 30 assembled integrally by a connecting portion 33 provided with a flange on the outer diameter side and the inner diameter side.
As shown in FIG. 11, the bracket 30 includes a press-fit component 31, a bearing support component 32, and a connecting portion 33. The press-fit component 31 and the bearing support component 32 are made of metal, for example, a galvanized steel plate. However, it is not limited to galvanized steel sheet. The material of the connection part 33 has insulation, for example, is resin.

As shown in FIG. 12, the press-fitting component 31 has a substantially ring shape, and includes a flange 31 a that contacts the end face of the mold stator 10, a U-shaped press-fit portion 31 b that is press-fitted into the mold stator 10 and the connection portion 33, and a connection portion 33. And a notch 31d fitted into the protrusion 33b of the connecting portion 33. The outer diameter of the press-fit portion 31b is larger than the inner diameter of the inner peripheral portion 10a of the mold stator 10 by the press-fit allowance, and the inner diameter of the press-fit portion 31b is smaller than the outer diameter of the connecting portion 33 by the press-fit allowance. . The flange 31a that abuts on the mold stator 10 and the flange 31c that abuts on the connecting portion 33 are provided at substantially right angles at the end of the press-fit portion 31b. The contact surface is in the same direction side, for example, the surface that becomes the inner diameter side of the mold stator 10 in the embodiment is the contact surface. That is, the press-fitting directions into the mold stator 10 and the connecting portion 33 are the same, and when the bracket 30 is press-fitted into the mold stator 10, a load is also applied to the connecting portion 33 in the press-fitting direction. Assemble is not removed and reliability is ensured.

As shown in FIG. 13, the bearing support component 32 has a substantially ring shape, the bearing on the inner diameter side supports the bearing, and the outer diameter side is press-fitted into the coupling portion, the flange 32 b that contacts the coupling portion 33, and the coupling portion 33. It is comprised by the notch 32c fitted to the protrusion 33c. The outer diameter of the bearing support portion 32 a is larger than the inner diameter of the connecting portion 33 by the press-fitting allowance. In addition, although the outer diameter of the bearing support part 32a was press-fit with the connection part 33, you may provide a press-fit part with a connection part separately from the bearing support part 32a. The press-fitting into the connecting portion 33 can prevent the bearing support portion 32a from being affected by the deformation of the bearing support portion 32a. The flange 32b that contacts the connecting portion 33 is provided at a substantially right angle at the end of the bearing support portion 32a. For example, the contact surface is on the bearing support portion 32a side in the embodiment.

As shown in FIG. 14, the connecting portion 33 has a substantially ring shape, and the outer diameter side is a press-fit surface of the press-fitting part 31 and the inner diameter side is a press-fit surface of the bearing support part 32, and the end surface is a contact surface of the flange. One end surface is a contact surface of the flange 32b of the bearing support component 32, and is provided with a protrusion 33c that engages with the notch 32c of the bearing support component 32. The other end face is provided with a step surface 33a with which the flange 31c of the press-fitting part abuts and a projection 33b to be fitted with the notch 31d of the press-fitting part. The connecting portion 33 is made of an insulating resin. However, since it is press-fitted, dimensional accuracy, low linear expansion, and strength are required, and therefore a thermosetting resin that is also used in a mold stator is desirable.

Next, assembly of the bracket 30 will be described with reference to FIGS. The bearing support component 32 and the connecting portion 33 are positioned so as to engage the notch 32c of the bearing support component 32 and the protrusion 33c on one end surface of the connecting portion 33, and the outer diameter of the bearing support component 32 and the inner diameter of the connecting portion 33 are set. The flange 32b of the bearing support component is press-fitted until it abuts against one end surface of the connecting portion 33. By engaging the notch 32c of the bearing support portion and the protrusion 33c of the connecting portion, rotation is prevented. The same applies to the protrusions on the bearing support component and the notches in the connecting portion.

The press-fitting part 31 and the connecting part 33 are positioned so as to engage the notch 31d of the press-fitting part and the protrusion 33b on the other end surface of the connecting part 33, and the inner diameter side of the press-fitting part 31b and the outer diameter of the connecting part 33 are fitted. The flange 31 c of the press-fitting part 31 is press-fitted until it comes into contact with the stepped surface 33 a of the other end face of the connecting portion 33, thereby forming the bracket 30. By engaging the notch 31d of the press-fitting portion with the protrusion 33b of the connecting portion, rotation is prevented. The same applies to the protrusions on the bearing support component and the notches in the connecting portion.

The connecting portion 33 is sandwiched between the flange 31 c of the press-fit component 31 and the flange 32 b of the bearing support component 32. When the bracket 30 is press-fitted into the mold stator 10, the flange 31 c of the press-fitting part acts to press-fit the connecting part 33 into the bearing support part 32, and the assembly of the bracket 30 is maintained. After the bracket 30 is press-fitted into the mold stator 10, when a load is applied that the bearing support component 32 is pushed by the shaft, the flange 31 c of the press-fit component 31 acts to press the connecting portion 33, and the bracket 30 is assembled. Kept. When the bearing support component 32 is pushed from the outside, the bearing support component 32 and the connecting portion 33 are supported by press-fitting and the shaft, and the assembly of the bracket 30 is maintained.

As shown in FIG. 11, as shown in FIG. 11, the bracket 30 in which the press-fit component 31, the bearing support component 32, and the connecting portion 33 are assembled by press-fitting can be kept integral like the conventional bracket, There is no loss of reliability. The connecting portion 33 is made of an insulating resin, and the press-fit component 31 and the bearing support component 32 are located between the portions of the bearing support component 32 adjacent to the end of the flange 31 c of the press-fit component 31 or the flange 32 b of the connection portion 32. The insulation distance L is the shorter distance between the parts of the press-fitting component 31 that is close to the end portion, and is insulated.

In addition, it is good also as the connection part 33 which provided the flanges 33d and 33e in the outer diameter side and the inner diameter side like FIG. By providing flanges 33d and 33e on the outer diameter side and inner diameter side of the connecting portion, the press-fitting part 31 and the bearing support part 32 can be arranged so as to be shifted in the axial direction, and the shortest distance between the press-fitting part 31 and the bearing support part 32 is the press-fitting part. The distance between the end of the flange 31c and the end of the flange 32b of the bearing support component 32 is the shortest distance. In the embodiment of FIG. 11, when the thickness of the connecting portion (length in the axial direction) is small, the insulating distance L is between the flange end portions of the press-fit component 31 and the bearing support component 32, and the insulating distance L is increased as the thickness of the connecting portion is increased. However, if it exceeds a certain value, the distance between the end of the flange 31c of the press-fit part 31 and the outer diameter of the bearing support part 32 or the end of the flange 32b of the bearing support part 32 and the inner diameter of the press-fit part 31 becomes the shortest distance. The insulation distance L cannot be increased beyond a certain level. The press-fitting component 31 and the bearing support component 32 are arranged so as to be shifted in the axial direction, that is, the press-fitting component and the bearing support component are not arranged in the same plane, so that the connecting portion can be separated by a distance L according to the length. Insulation can be further improved and reliability can be improved.

  In the present embodiment, the magnet and shaft of the ring-shaped rotor are integrated by the resin portion to insulate between the magnet and the shaft, and the press-fitting part 31 made of metal (having conductivity) and the bearing support part The bearing 30 is supported by the bracket 30 integrated with the connecting portion 33 made of resin (having insulating properties) and the bearing support portion of the molded stator, and the bearing and the stator are insulated. By suppressing the shaft current, there is an effect of suppressing the occurrence of electrolytic corrosion of the load side 21a and the anti-load side rolling bearing 21b.

  The present embodiment also includes a rotor 20 that does not have the ring-shaped position detecting resin magnet 25.

  In addition, although the electric motor 100 shown in FIG. 1 showed what the mold stator 10 side becomes a load side and the bracket 30 side becomes an anti-load side, the reverse may be sufficient. In addition, the press-fit parts, bearing support parts, and connecting parts are press-fit, but they may be bonded together. The press-fit parts and bearing support parts are insulated by assembling the press-fit parts and bearing support parts with insulating connecting parts. The same effect can be obtained.

  Further, the rotor 20 shown in FIG. 4 uses a rotor resin magnet 22 formed by mixing a magnetic material with a thermoplastic resin in a permanent magnet, but other permanent magnets (rare earth magnets (neodymium, samarium) are used. Iron), sintered ferrite, etc.) may be used.

  Similarly, other permanent magnets (rare earth magnets (neodymium, samarium iron), sintered ferrite, etc.) may be used for the position detecting resin magnet 25.

  As described above, when an electric motor is operated using an inverter, the carrier frequency of the inverter is set high for the purpose of reducing the noise of the electric motor generated due to the switching of the transistor in the power circuit. Yes. As the carrier frequency is set higher, the shaft voltage generated on the motor shaft based on the high frequency induction increases, and the potential difference existing between the inner ring and the outer ring of the rolling bearing supporting the shaft increases. The current easily flows through the rolling bearing. The current flowing through the rolling bearings causes corrosion called electrolytic corrosion on the rolling surfaces of the inner and outer ring raceways and the rolling elements (balls and rollers that roll between the inner and outer rings), thereby deteriorating the durability of the rolling bearings. .

  Therefore, the bracket 30 of the present embodiment is particularly effective for reducing the shaft current when the electric motor 100 is operated using an inverter.

  Next, a motor built-in drive circuit using the motor of the first embodiment will be described. FIG. 17 is a diagram showing the first embodiment, and is a circuit diagram of the motor built-in drive circuit 1 of the motor 100. As shown in FIG. 17, AC power is supplied to a drive circuit 1 with a built-in motor from a commercial AC power supply 2 provided outside the motor 100. The AC voltage supplied from the commercial AC power supply 2 is converted into a DC voltage by the rectifier circuit 3. The DC voltage converted by the rectifier circuit 3 is converted to an AC voltage having a variable frequency by the inverter main circuit 4 and applied to the electric motor 100. The electric motor 100 is driven by variable frequency AC power supplied from the inverter main circuit 4. The rectifier circuit 3 includes a chopper circuit that boosts the voltage applied from the commercial AC power supply 2 and a smoothing capacitor that smoothes the rectified DC voltage.

  The inverter main circuit 4 is a three-phase bridge inverter circuit, and the switching section of the inverter main circuit 4 has six IGBTs 6a to 6f (insulated gate bipolar transistors, simply defined as transistors) and six flywheel diodes serving as inverter main elements. SiC-SBDs 7a-7f (Schottky barrier diodes, simply defined as diodes) using silicon carbide (SiC) as (FRD) are provided. The SiC-SBDs 7a to 7f, which are FRDs, are reverse current prevention means for suppressing the counter electromotive force generated when the IGBTs 6a to 6f turn the current from ON to OFF.

  In the first embodiment, the IGBTs 6a to 6f and the SiC-SBDs 7a to 7f are IC modules in which each chip is mounted on the same lead frame and molded with epoxy resin and packaged. The IGBTs 6a to 6f may be IGBTs using SiC or GaN instead of IGBTs using silicon (Si-IGBT), and MOSFETs (Metal-Oxide-Semiconductor Field-) using Si, SiC, or GaN instead of IGBTs. Other switching elements such as Effect Transistor may be used.

  Two voltage-dividing resistors 8a and 8b connected in series are provided between the rectifier circuit 3 and the inverter main circuit 4, and the high-voltage DC voltage is reduced by the voltage-dividing circuit using the voltage-dividing resistors 8a and 8b. A DC voltage detector 8 is provided for sampling and holding the electrical signal.

  In addition, as described above, the electric motor 100 includes the rotor 20 (FIG. 10) and the mold stator 10 (FIG. 2), and the rotor 20 is rotated by the AC power supplied from the inverter main circuit 4. . A Hall IC 49b for detecting the position detecting resin magnet 25 is provided in the vicinity of the rotor 20 of the mold stator 10, and an electric signal from the Hall IC 49b is processed and converted into position information of the rotor 20. A rotor position detection unit 110 is provided.

  The position information of the rotor 20 detected by the rotor position detection unit 110 is output to the output voltage calculation unit 120. The output voltage calculation unit 120 is an optimum inverter main unit to be applied to the electric motor 100 based on the command of the target rotational speed N given from the outside of the electric motor built-in drive circuit 1 or information on the operating condition of the apparatus and the positional information of the rotor 20. The output voltage of the circuit 4 is calculated. The output voltage calculation unit 120 outputs the calculated output voltage to the PWM signal generation unit 130. PWM is an abbreviation for Pulse Width Modulation.

  The PWM signal generation unit 130 outputs a PWM signal that becomes the output voltage given from the output voltage calculation unit 120 to the main element drive circuit 4a that drives each of the IGBTs 6a to 6f of the inverter main circuit 4, and the inverter main circuit 4 Each of the IGBTs 6a to 6f is switched by the main element drive circuit 4a.

  In the first embodiment, the inverter main circuit 4 is a three-phase bridge, but another inverter circuit such as a single phase may be used.

  Here, the wide band gap semiconductor will be described. A wide band gap semiconductor is a generic term for semiconductors having a larger band gap than Si, and SiC used in the SiC-SBDs 7a to 7f is one of the wide band gap semiconductors, in addition to gallium nitride (GaN), There are diamonds. Furthermore, wide band gap semiconductors, particularly SiC, have higher heat resistance temperature, dielectric breakdown strength, and thermal conductivity than Si. In the first embodiment, SiC is used for the FRD of the inverter circuit, but other wide band gap semiconductors may be used instead of SiC.

Next, the manufacturing process of the bracket 30 will be described. FIG. 18 is a diagram illustrating the first embodiment, and is a diagram illustrating a manufacturing process of the bracket 30. As shown in FIG.
(1) The press-fitting of the press-fit component 31 and the bearing support component 32 and the forming of the connecting portion 33 are performed (step 1).
(2) Set the bearing support part 32 on the jig with the bearing support part 32a facing upward, and insert the connection part 33 into the bearing instruction part 32 so that the inner diameter of the connection part 33 is fitted to the outer diameter of the bearing instruction part 32a. (Step 2).
(3) One end face of the connecting portion 33 is pushed with a jig and press-fitted until the other end face of the connecting portion 33 comes into contact with the flange 32b of the bearing support component 32 (step 3).
(4) With the flange 31c of the press-fitting part 31 facing upward, the press-fitting part 31 is set in the connecting part 33 so that the inner diameter of the press-fitting part 31 is fitted to the outer diameter of the connecting part 33 (step 4).
(5) The flange 31c of the press-fitting part 31 is pushed with a jig and press-fitted until the flange 31c comes into contact with the end face of the connecting portion (step 5).

  According to the above manufacturing process, the press-fit part 31 and the bearing support part 32 are pressed with the same mold, so that the coaxiality of the press-fit part 31 and the bearing support part 32 can be improved. Since the connecting portion can be manufactured in a substantially ring shape and can be molded with good dimensional accuracy, the inner diameter and outer diameter of the connecting portion can be molded with improved coaxiality. Further, since the press-fit component 31 and the bearing support component 32 with improved coaxiality are assembled by press-fitting into the connecting portion with improved coaxiality of the inner and outer diameters, the bracket 30 with improved coaxiality between the bearing support portion and the press-fit portion is provided. Can be obtained. Further, by using this bracket 30 for an electric motor, it is possible to improve performance and reduce noise by improving the coaxiality of the stator and the rotor.

  Also, in this embodiment, the magnet and shaft of the ring-shaped rotor are integrated by the resin part to insulate between the magnet and the shaft, and the press-fit part made of metal (having conductivity) and the bearing support The bearing 30 is supported by the bracket 30 in which the portion is integrated with a resin-made (insulating) connecting portion and the bearing support portion of the mold stator, and the shaft current is suppressed by insulating between the bearing and the stator. Thereby, generation | occurrence | production of the electric corrosion of the load side 21a and the anti-load side rolling bearing 21b can be suppressed. However, the same effect can be obtained by integrating the ring-shaped position detecting resin magnet 25 with the resin portion 24 together with the shaft 23 and the resin magnet 22 of the ring-shaped rotor.

  When the motor is driven by an inverter, the carrier frequency of the inverter is set higher for the purpose of reducing the noise of the motor. However, as the carrier frequency is set higher, high frequency induction is applied to the shaft of the motor. The shaft voltage generated based on this increases, and the potential difference existing between the inner ring and the outer ring of the rolling bearing supporting the shaft increases, so that the current flowing through the rolling bearing also increases. Therefore, the bracket 30 of the present embodiment is particularly effective for reducing the shaft current when the electric motor 100 is operated using an inverter. Here, the detection method is described using the Hall IC 49b which is a sensor for detecting the magnetic pole of the position detection resin magnet 25 of the rotor 20. However, the coil is not used without using the position detection resin magnet 25 and the Hall IC 49b. Needless to say, the sensorless driving method in which the flowing current is detected by a current detector (not shown) and the electric motor is driven by using a microcomputer or the like in the waveform generation circuit 120 has the same effect.

Embodiment 2. FIG.
In Embodiment 1, the example which assembled the connection part which connects a press-fit component and a bearing support component as one component was demonstrated. In the second embodiment, an example will be described in which the bracket is integrally formed through a connecting portion formed by injecting resin between the metal press-fitting component and the metal bearing support component. .

19 to 22 are views showing the bracket of the second embodiment. 19A is a cross-sectional view of the bracket 300, and FIG. 19B is a side view thereof. 20A is a side view of the press-fitting component 301, and FIG. 20B is a cross-sectional view thereof. 21A is a cross-sectional view of the bearing support component 302, FIG. 21B is a side view, and FIG. 22 is a bracket 300 in which the press-fitting component and the bearing support component are not arranged in the same plane and are integrally formed by the connecting portion 303. FIG.
As shown in FIG. 19, the bracket 300 includes a press-fit component 301, a bearing support component 302, and a connecting portion 303. The material of the press-fit component 301 and the bearing support component 302 is made of metal, for example, a galvanized steel plate. However, it is not limited to galvanized steel sheet. The material of the connection part 303 has insulation, for example, is resin.

As shown in FIG. 20, the press-fitting component 301 has a substantially ring shape, and is integrally formed with a flange 301 a that abuts on the end surface of the mold stator 10, a U-shaped press-fit portion 301 b that is press-fitted into the mold stator 10, and a connecting portion 303. Flange 301c and a notch 301d provided in the flange 301c. The outer diameter of the press-fitting portion 301b is larger than the inner diameter of the inner peripheral portion 10a of the mold stator 10 by the press-fitting allowance. A flange 301a that abuts on the mold stator 10 and a flange 301c that is formed on the connecting portion 303 are provided at substantially right angles to the end of the press-fit portion 301b.

As shown in FIG. 21, the bearing support component 302 has a substantially ring shape, and the inner diameter side includes a bearing support portion 302a that supports the bearing, a flange 302b that is integrally formed with the coupling portion 303, and a notch 302c that is provided in the flange 302b. Is done. The flange 302b formed in the connecting portion 303 is provided at a substantially right angle to the end portion of the bearing support portion 302a.

Next, a method for forming the bracket 300 will be described. First, the press-fitting component 301 and the bearing support component 302 are set in a mold for molding the connecting portion 303 and are integrally molded with an insulating resin to form the bracket 300. Since the connecting portion 303 is also required to have low linear expansion and strength, a thermosetting resin that is also used in a mold stator is desirable.

  The press-fitting part 301 is positioned so that the press-fitting part 301b faces downward and the outer diameter of the press-fitting part 301b is fitted to the lower outer diameter of the connecting part molding die, and the inner diameters of the flange 301a, press-fitting part 301b, and flange 301c are formed by the connecting part. It is set to contact the lower mold end surface of the mold. Since the outer diameter of the press-fitting portion 301b is press-fitted into the mold stator 10, the dimensional accuracy is good, and the press-fit portion 301b is held in the lower die of the connecting portion molding die with high accuracy.

The bearing support part 302 is positioned so that the flange 302c faces downward and the inner diameter of the bearing support 302a is fitted into a cored bar disposed on the lower mold of a connecting part molding die (not shown), and the inner diameter side of the flange 302b is connected to the connecting part. It is set so as to contact the end face of the core of the molding die. The flange 301c of the press-fitting part 301 and the flange 302b of the bearing support part 302 have substantially the same axial position, that is, the press-fitting part 301 and the bearing support part 302 are arranged in substantially the same plane. The inner diameter of the bearing support portion 302a supports the bearing, so that the dimensional accuracy is good, and the bearing support portion 302a is accurately held by the core metal of the connecting portion molding die.

By positioning and setting the press-fitting part 301 and the bearing support part 302 in the connecting portion molding die, it is possible to ensure the coaxiality of the press-fitting part 301 and the bearing support part 302. Although the press-fitting part 301 is fitted to the lower mold outer diameter of the connecting part molding die, the inner diameter of the press-fitting part 301b may be fitted to the core metal of the connecting part molding die. The component 302 is fitted to the metal core, and the coaxiality of the press-fitting component 301 and the bearing support component 302 can be further improved.

After the press-fitting part 301 and the bearing support part 302 are set on the lower mold of the connecting part molding die, the upper part of the connecting part molding die is brought into contact with the lower mold and clamped to mold the connecting part 303. The press fitting part 301 has a flange 301a, a press fit part 301b, and an inner diameter of the flange 301c, and the bearing support part 302 has an inner diameter of the flange 302c that is in contact with the upper mold of the connecting part molding die, and is sandwiched between the upper mold and the lower mold. A thermosetting resin is injected into the cavity of the mold and molded to form the connecting portion 303, and the press-fitting component 301 and the bearing support component 302 are integrally molded at the connecting portion 303. The thermosetting resin is injected from the molding machine, and flows through the runner 303b formed on the runner of the connecting part molding die and the press-fitting part, and is filled in the connecting part 303a.

The runner portion b has a flange 301a and a press-fit portion 301b of the press-fit component 301, and the connection portion 303a has a burr generated by clamping the flange 301c of the press-fit component 301 and the flange 302b of the bearing support component 302 with a connection mold. Can be suppressed. The runner portion 303b may be separated from the connecting portion 303 after molding. A hole is formed in the runner portion 303b forming portion of the flange 301a of the press-fitting part 301, and the resin is poured on the back side of the flange 301a to form the runner portion. You may make it pinch | interpose with the runner part 303b from the front and back. This prevents the runner from coming off.

Further, the notch 301d of the flange 301c of the press-fitting part 301 and the notch 302c of the flange 302b of the bearing support part 302 are formed at the connecting portion, and the press-fitting part 301 and the bearing support part 302 are prevented from rotating. Thus, the bracket 300 integrally formed by the connecting portion can be kept integrated like the conventional bracket without the connecting portion 303 falling off, and the reliability is not impaired.

The connecting part 303 is made of an insulating resin, and the press-fitting part 301 and the bearing support part 302 are located between the parts of the bearing support part 302 adjacent to the end of the flange 301c of the press-fitting part 301 or the flange 302b of the connecting part 302. An insulation distance L (between the end of the flange 301 of the press-fit component 301 and the end of the flange 302b of the bearing support component 302 in FIG. 19) is insulated, which is closer to the distance between the parts of the press-fit component 301 adjacent to the end.

As shown in FIG. 22, the flange 301 c of the press-fitting part 301 and the flange 302 b of the bearing support part 302 may be shifted in the axial direction. That is, since the press-fitting component 301 and the bearing support component 302 are not arranged in the same plane, the insulation distance L can be separated, and the insulation can be further improved and the reliability can be improved.

In this embodiment, a magnet and a shaft of a ring-shaped rotor are integrated by a resin portion so that the magnet and the shaft are insulated from each other, and a metal (conductive) press-fitting component 301 and a bearing support component Bracket 300 in which 302 is integrally formed with a resin-made (insulating) connecting portion 303, and the bearing is supported by the bearing support portion of the molded stator, and the shaft current is suppressed by insulating between the bearing and the stator. By doing this, there is an effect of suppressing the occurrence of electrolytic corrosion of the load side 21a and the anti-load side rolling bearing 21b.
In addition, when the bracket 300 of this Embodiment 2 is used for an electric motor, it is comprised as shown in FIG.

Next, a method for manufacturing the bracket according to the second embodiment will be described.
FIG. 24 is a diagram illustrating the second embodiment, and is a diagram illustrating a manufacturing process of the bracket 300. As shown in FIG.
(1) The press-fitting part 301 and the bearing support part 302 are pressed (step 1).
(2) The press-fitting part 301 and the bearing support part 302 are set so as to come into contact with the lower mold end surface of the connecting portion molding die (not shown) (step 2).
(3) The connecting part molding die is clamped to form the connecting part (step 3).

  According to the manufacturing process described above, the press-fit part 301 and the bearing support part 302 are pressed with the same mold, so that the coaxiality of the press-fit part 301 and the bearing support part 302 can be improved. Since the press-fit component 301 and the bearing support component 302 are positioned with high coaxial accuracy by the connecting portion molding die, the bracket 300 with improved coaxiality between the press-fit portion 301b and the bearing support portion 302a can be obtained. Further, by using the bracket 300 for an electric motor, it is possible to improve performance and reduce noise by improving the coaxiality of the stator and the rotor. Further, the press-fitting component 301 and the bearing support portion 302 are set in a connecting portion molding die and integrally molded to form the bracket 300, whereby the process is simplified and the cost can be reduced.

  Also, in this embodiment, the magnet and shaft of the ring-shaped rotor are integrated by the resin part to insulate between the magnet and the shaft, and the press-fit part made of metal (having conductivity) and the bearing support The bearing is supported by the bracket 300 in which the parts are integrated with a resin-made (insulating) connecting part, and the bearing support part of the molded stator, and the shaft current is suppressed by insulating the bearing and the stator. Thereby, generation | occurrence | production of the electric corrosion of the load side 21a and the anti-load side rolling bearing 21b can be suppressed. However, the same effect can be obtained by integrating the ring-shaped position detecting resin magnet 25 with the resin portion 24 together with the shaft 23 and the resin magnet 22 of the ring-shaped rotor.

Embodiment 3 FIG.
FIG. 25 is a diagram showing the third embodiment, and is a configuration diagram of the air conditioner 200.

  The air conditioner 200 includes an indoor unit 210 and an outdoor unit 220 that is connected to the indoor unit 210 with a refrigerant pipe. The indoor unit 210 is equipped with an indoor unit blower (not shown), and the outdoor unit 220 is equipped with an outdoor unit blower 230.

  The outdoor unit blower 230 and the indoor unit blower include the electric motor 100 according to the embodiment as a drive source.

  By mounting the electric motor 100 of the embodiment on the outdoor unit blower 230 and the indoor unit blower that are main components of the air conditioner 200, the durability of the air conditioner 200 is improved.

DESCRIPTION OF SYMBOLS 1 Motor built-in drive circuit, 2 Commercial AC power supply, 3 Rectifier circuit, 4 Inverter main circuit, 4a Main element drive circuit, 6a-6f IGBT, 7a-7f SiC-SBD, 8 DC voltage detection part, 8a Voltage dividing resistor, 8b Voltage dividing resistor, 10 Mold stator, 10a Inner circumference, 11 Bearing support, 20 Rotor, 21a Load side rolling bearing, 21a-1 Inner ring, 21a-2 Outer ring, 21a-3 Rolling element, 21b Anti-load side rolling Bearing, 21b-1 Inner ring, 21b-2 Outer ring, 21b-3 Rolling element, 22 Rotor resin magnet, 22a Notch, 22b Pedestal, 22c Positioning protrusion, 23 Shaft, 23a Knurl, 24 Resin part, 24a Inner diameter retainer Part, 24b taper part, 24c resin injection part, 24d contact surface, 24e step part, 24f fitting part, 24g center tube part, 24h anti-load side end Surface, 25 Position detection resin magnet, 25a Rib, 25b Step, 30 Bracket, 31 Press-fit part, 31a Flange, 31b Press-fit part, 31c Flange, 31d Notch, 32 Bearing support part, 32a Bearing support part, 32b Flange, 32c Notch, 33 connecting part, 33a step surface, 33b protrusion, 33c protrusion, 40 stator, 41 stator core, 42 coil, 43 insulation part, 44 terminal, 44a power supply terminal, 44b neutral point terminal, 45 substrate, 46 Lead wire lead part, 47 lead wire, 48 prism, 49a IC, 49b Hall IC, 50 mold resin, 100 electric motor, 110 rotor position detector, 120 output voltage calculator, 130 PWM signal generator, 200 air conditioner, 210 indoor unit, 220 outdoor unit, 230 blower for outdoor unit,
300 Bracket, 301 Press-in part, 301a Flange, 301b Press-in part, 301c Flange, 301d Notch, 302 Bearing support part, 302a Bearing support part, 302b Flange, 302c Notch, 303 Connecting part, 303a Connecting part, 303b Runner part

Claims (10)

A stator that is wound around an iron core composed of a plurality of teeth to form a coil;
A rotor that is integrated with a resin portion between the magnets arranged on the outer periphery of the shaft and provided with rolling bearings at both axial ends of the shaft;
A bracket for supporting one rolling bearing of the rotor,
The bracket includes a metal press-fitting part that is press-fitted into the stator, a metal bearing support part that supports the rolling bearing, and an insulative connecting part that connects the bearing support part and the press-fitting part. An electric motor characterized by comprising   The electric motor characterized in that the connecting portion is made of resin.   3. The bracket according to claim 1, wherein the metal press-fitting part and the metal bearing support part are press-fitted into the connecting portion configured as a ring-shaped part. Electric motor.   3. The bracket according to claim 1, wherein the bracket is integrally formed through a connecting portion formed by injecting a resin between the metal press-fitting component and the metal bearing support component. The electric motor described. 5. The electric motor according to claim 1, wherein the bearing support component and the press-fitting portion are arranged on substantially the same plane. 5. The electric motor according to claim 1, wherein the bearing support component and the press-fitting component are arranged in steps. A position detection circuit for detecting a magnetic pole of the rotor by a position detection element;
A waveform generation circuit for generating a PWM (Pulse Width Modulation) signal for driving the inverter based on a speed command signal for instructing the rotation speed of the rotor and a position detection signal from the position detection circuit;
A pre-driver circuit that generates a drive signal from the output of the waveform generation circuit;
7. The electric motor according to claim 1, further comprising an inverter type drive circuit comprising a power circuit having an arm in which a transistor and a diode are connected in parallel and these are connected in series.   8. An air conditioner using the electric motor according to claim 5 as an electric motor for a blower. It is a manufacturing method of the electric motor according to claim 3,
The method of manufacturing an electric motor according to claim 1, wherein the bracket is formed by integrally pressing the metal press-fitting portion and the metal bearing support portion with the connecting portion having the insulating property. It is a manufacturing method of the electric motor according to claim 4,
The method of manufacturing an electric motor according to claim 1, wherein the bracket is formed by integrally molding the metal press-fit portion and the metal bearing support portion as a connecting portion by injecting the resin having the insulating property.

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