CN204497871U - The rotor of motor, motor and air conditioner - Google Patents

Abstract

The purpose of the utility model is to provide a rotor of a motor, a motor and an air conditioner capable of improving performance, improving reliability and reducing cost. The rotor (20) of the motor includes: a shaft (1); a rotor magnet (10), which is provided integrally with the shaft around the shaft (1); a magnet for position detection (11), which is installed on the rotor magnet (10) One end in the axial direction of the rotor magnet (10) is installed on the shaft (1) on both sides of the rotor magnet (10). The detection magnet (11) has a cylindrical portion (12) provided around the shaft (1), and one of a pair of bearings (21) is positioned in contact with an end surface of the cylindrical portion (12).

Description

Rotors of electric motors, electric motors and air conditioners

technical field

The utility model relates to a rotor of an electric motor, an electric motor and an air conditioner.

Background technique

A rotor of a conventional electric motor is disclosed as follows: The rotor assembly of the electric motor includes: a rotor having a back yoke fitted on a shaft; The detection elements are arranged in a manner facing each other; and bearings are arranged on both sides of the rotor. In the rotor assembly of the motor, a magnet fixing member clamped by a magnet for position detection and a bearing on the side of the magnetic force detection element is provided, and the position detection is used. The distance between the magnet and the magnetic force detection element is maintained at a constant distance (for example, Patent Document 1).

Patent Document 1: Japanese Unexamined Patent Publication No. 2003-52159

Utility model content

In the rotor of the conventional electric motor described above, the distance between the position detection magnet and the magnetic force detection element is determined by the cumulative error between the position detection magnet and the magnet fixing member.

Therefore, management and adjustment of dimensions are complicated, and there are problems in productivity and quality control.

In addition, if the cumulative error is large, there is a problem that the detection accuracy of the rotor position deteriorates, leading to deterioration of the controllability and performance of the motor.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotor of an electric motor, an electric motor, and an air conditioner capable of improving performance and reliability and reducing costs.

In order to solve the above problems and achieve the purpose of the utility model, the rotor of the motor involved in the utility model includes: a shaft; a rotor magnet, which is integrally arranged with the shaft around the above-mentioned shaft; a magnet for position detection, which is installed on the above-mentioned One end of the rotor magnet in the axial direction is provided with a shaft hole through which the shaft is inserted; and a pair of bearings are mounted on the shaft on both sides of the rotor magnet, wherein the position detection magnet has One of the pair of bearings abuts against the end surface of the cylindrical portion of the surrounding cylindrical portion and is positioned.

The rotor magnet includes: a bracket provided on the end face of the magnet for position detection; The above-mentioned projection is inserted into the above-mentioned hole, the above-mentioned position detection magnet is brought into contact with the above-mentioned bracket, and the above-mentioned position detection magnet is fixed to the above-mentioned rotor magnet by thermally welding the front end of the above-mentioned projection.

The rotor magnet has a cylindrical portion protruding from an end surface on the side of the position detection magnet at a position closer to the inner diameter side than the position where the bracket is provided, and the end surface of the cylindrical portion of the rotor magnet is in contact with the bracket. The end surfaces form the same plane, and the position detection magnet is attached to the rotor magnet by abutting against the bracket and the cylindrical portion of the rotor magnet.

The position detection magnet includes a detected portion facing the magnetic force detection element of the stator in the axial direction, and the height of the tip portion of the thermally welded protrusion is lower than the detected portion.

The portion of the position detection magnet where the hole is provided has a thinner wall thickness than the cylindrical portion and the detected portion of the position detection magnet.

The outer circumference of the protrusion is polygonal, the hole is circular, and the dimensions of the protrusion and the hole are designed such that when the protrusion is inserted into the hole, corners of the outer circumference of the protrusion are cut off by the edge of the hole .

The height of the protrusion is shorter than the axial length from one end of the shaft on the protrusion side to the end surface of the bracket.

The other bearing of the pair of bearings is positioned in contact with a bearing abutting portion provided on an inner diameter side of the rotor magnet.

The electric motor involved in the utility model includes the rotor of the above-mentioned electric motor.

The above-mentioned electric motor is mounted in the air conditioner which concerns on this invention.

According to the present invention, it is possible to improve performance, improve reliability, and reduce costs.

Description of drawings

FIG. 1 is a diagram showing the configuration of a motor according to Embodiment 1. FIG.

Fig. 2(a) is a side view of the rotor on which the bearing is mounted viewed from the axial side and the side where the protrusion is provided.

Fig. 2(b) is an X-X sectional view of Fig. 2(a).

Fig. 3(a) is a side view of the rotor viewed from the side in which the protrusion is provided in the axial direction.

Fig. 3(b) is an X-X sectional view of Fig. 3(a).

Fig. 4(a) is a side view of the rotor magnet viewed from the axial side and the side where the protrusion is provided.

Fig. 4(b) is an X-X sectional view of Fig. 4(a).

Fig. 5(a) is a plan view of a magnet for position detection.

Fig. 5(b) is an X-X sectional view of Fig. 5(a).

6( a ) is a perspective view of the rotor magnet and the position detection magnet before the position detection magnet is attached to the rotor magnet.

Fig. 6(b) is a perspective view of a rotor magnet to which a magnet for position detection is mounted.

FIG. 6( c ) is a perspective view of the rotor magnet in which the position detection magnet is fixed by thermally welding the front end of the projection.

7 is a manufacturing flowchart showing a method of manufacturing the rotor of the electric motor according to Embodiment 1. FIG.

FIG. 8 is a diagram showing an example of the configuration of an air conditioner according to Embodiment 2. FIG.

Symbol Description

1 axis

2 knurling

3 back yoke

4 Bearing abutment

5 protrusions

6 Gates

7 brackets

8 Cylindrical part

9 plastic magnets

10 rotor magnets

11 Magnet for position detection

12 Cylindrical part

13 shaft hole

14 Detected part

15 holes

16 base

20 rotor

21 bearings

30 brackets

35 Hot welding part

40 molded stators

41 molding resin

42 Stator

43 Stator core

44 insulation part

45 Coils

46 Substrate

47 Magnetic detection element

300 air conditioner

310 indoor unit

320 outdoor unit

330 blower for outdoor unit

Detailed ways

Hereinafter, embodiments of the rotor of the electric motor, the electric motor, and the air conditioner according to the present invention will be described in detail based on the drawings. In addition, this invention is not limited by the following embodiment.

Embodiment 1

Fig. 1 is a diagram showing the structure of the motor according to the present embodiment, Fig. 2(a) is a side view of the rotor with bearings installed in the axial direction and the side where the protrusion is provided, Fig. 2(b) is Fig. 2(a) ), Fig. 3(a) is a side view of the rotor viewed from the axial side and the protrusion is set, Fig. 3(b) is a X-X sectional view of Fig. 3(a), and Fig. 4(a) is viewed from The side view of the rotor magnet is viewed in the axial direction and on the side where the protrusion is set. Fig. 4(b) is a diagram of the X-X cross-sectional view of Fig. 4(a), Fig. 5(a) is a top view showing the magnet for position detection, Fig. 5( b) is the X-X sectional view of Fig. 5 (a), Fig. 6 (a) is a perspective view of the rotor magnet and the position detection magnet before the position detection magnet is installed, and Fig. 6 (b) is a position detection magnet. As for the perspective view of the rotor magnet, FIG. 6( c ) is a perspective view of the rotor magnet in which the position detection magnet is fixed by thermally welding the front end of the projection. Next, the structures of the rotor and the motor according to this embodiment will be described with reference to FIGS. 1 to 6( c ).

As shown in FIG. 1 , the motor 100 includes: a molded stator 40 ; a rotor 20 disposed inside the molded stator 40 ; and a metal bracket 30 attached to one axial end of the molded stator 40 . The motor 100 is, for example, a brushless DC motor or a stepping motor.

The molded stator 40 is formed by integrally molding the stator 42 to which the base plate 46 is attached, using a thermosetting resin (molded resin 41 ) such as unsaturated polyester resin. Electronic components are mounted on the substrate 46 and lead wires are soldered. Since the substrate 46 has a structure weak in strength, low-pressure molding is preferable, and thus a thermosetting resin such as an unsaturated polyester resin is used for molding.

The stator 42 includes: a stator core 43 formed by laminating electromagnetic steel sheets; an insulating portion 44 applied to the stator core 43 ; and a coil 45 wound around the insulating portion 44 . The insulating portion 44 is integrally molded with the stator core 43 using thermoplastic resin such as PBT (polybutylene terephthalate), or the insulating portion 44 is formed as a separate molded product and attached to the stator core 43 .

The substrate 46 is attached to the insulating portion 44 . A sensor circuit for detecting the position of the rotor 20 or a drive circuit for driving the motor 100 is formed on the substrate 46 and electronic components are mounted thereon. The electronic components on the substrate 46 include a magnetic force detection element 47, and the magnetic force detection element 47 is arranged to face the position detection magnet 11 (FIG. 3(a), FIG. 3(b)), and detects Magnetic force is used to detect the position of the rotor 20 . The brushless DC motor is driven by, for example, controlling the energization of the coil 45 in accordance with the position of the rotor 20 in the drive circuit of the substrate 46 . Accordingly, the motor 100 can be driven with high efficiency and low noise.

A shaft (shaft) 1 is provided integrally therein with the rotor 20 . A pair of bearings 21 are attached to the shaft 1 . The rotor 20 mounted with the bearing 21 is inserted into the hollow portion provided in the molded stator 40 , and the bearing 21 is supported by the molded stator 40 and the bracket 30 .

FIG. 2( a ) is a side view of the rotor 20 mounted with the bearing 21 viewed from the axial side and the side where the protrusion 5 is provided, and FIG. 2( b ) is an X-X cross-sectional view of FIG. 2( a ). FIG. 3( a ) is a side view of the rotor 20 viewed from the side where the protrusion 5 is provided in the axial direction, and FIG. 3( b ) is an X-X sectional view of FIG. 3( a ). FIG. 4( a ) is a side view of the rotor magnet 10 viewed from the side where the protrusion 5 is provided in the axial direction, and FIG. 4( b ) is an X-X sectional view of FIG. 4( a ).

As shown in Fig. 2 (a), Fig. 2 (b) and Fig. 3 (a), Fig. 3 (b), the rotor 20 includes: a shaft 1; a rotor magnet 10, which is integrally arranged with the shaft 1 around the shaft 1 and a magnet 11 for position detection, which is installed at one end of the rotor magnet 10 in the axial direction. Here, for example, a plurality of brackets 7 are provided on one end surface in the axial direction of the rotor magnet 10 , and the position detection magnet 11 is attached so as to be in contact with the brackets 7 . In addition, each bracket 7 is provided with a protrusion 5, and in the state where the position detection magnet 11 is mounted on the rotor magnet 10, the protrusion 5 is inserted into the hole 15 provided in the position detection magnet 11 (Fig. 5(a). ), FIG. 5( b )), and the front end portion of the protrusion 5 is thermally welded to fix the position detection magnet 11 to the rotor magnet 10 . At this time, the front end portion of the protrusion 5 is thermally welded to form a thermally welded portion 35 . The height of the thermally welded portion 35 is equal to or lower than that of the detected portion 14 of the position detection magnet 11 .

In addition, one bearing 21 is press-fitted along the shaft 1 until it comes into contact with the bearing abutting portion 4 of the rotor magnet 10 , and the other bearing 21 is press-fitted along the shaft 1 to the cylindrical portion of the position detection magnet 11 . until the end faces of the cylindrical portion 12 abut against each other. The bearing 21 is, for example, a ball bearing. A pair of bearings 21 are attached to the shaft 1 on both sides of the rotor magnet 10 .

As shown in Fig. 4 (a), Fig. 4 (b), the rotor magnet 10 includes: a back yoke 3, which is fixed around the shaft 1; and a plastic magnet 9 (resin magnet part), which is arranged on the outer periphery of the back yoke 3 noodle. The back yoke 3 is formed by molding thermoplastic resin containing soft magnets or magnetic powder. The back yoke 3 can be integrally formed with the shaft 1 on the outer peripheral surface of the shaft 1 . The plastic magnet 9 is formed by molding a thermoplastic resin containing rare earth magnetic powder. The plastic magnet 9 is integrally formed with the back yoke 3 on the outer peripheral surface of the back yoke 3 . Knurling 2 is provided on the outer peripheral surface of the shaft 1 at the center portion in the axial direction. The knurling 2 prevents the shaft 1 from coming off the back yoke 3 and from turning.

The back yoke 3 is cylindrical in shape with a corrugated outer periphery. The back yoke 3 has a cylindrical portion 8 that is a tubular portion on the inner diameter side of one end surface (the end surface on the side of the base plate 46 ), and has a bearing abutting portion 4 on the inner diameter side of the other end surface (the end surface opposite to the base plate 46 side). . Specifically, the cylindrical portion 8 is provided around the shaft hole on the end surface of the back yoke 3 on the base plate 46 side, and protrudes axially outward at a predetermined height. The cylindrical portion 8 is provided on the inner diameter side of the base 7 . The cylindrical portion 8 abuts against the bearing 21 via the position detection magnet 11 . The bearing abutting portion 4 is provided around the shaft hole on the inner diameter side of the back yoke 3 on the end surface opposite to the end surface on which the cylindrical portion 8 is provided, and protrudes axially outward at a predetermined height.

In addition, the inner diameter of the cylindrical portion 8 is larger than the outer diameter of the shaft 1 to a certain depth from the end surface thereof. Accordingly, it is possible to prevent burrs from being generated at the portion into which the bearing 21 is press-fitted when the back yoke 3 is formed, thereby improving quality.

On the end surface of the back yoke 3 where the cylindrical portion 8 is provided, a plurality of brackets 7 and protrusions 5 extending in the axial direction from each bracket 7 are provided. Here, the end surface of the back yoke 3 on which the cylindrical portion 8 is provided is the end surface of the back yoke 3 on the side of the position detection magnet 11 . For example, three brackets 7 are formed, but other numbers may be used. The height of the protrusion 5 is shorter than the axial length from one end of the shaft 1 on the protrusion 5 side to the end surface of the bracket 7 .

The plurality of brackets 7 are integrally formed with the cylindrical portion 8 . The plurality of brackets 7 radially extend, for example, from the cylindrical portion 8 to the outer diameter side. In addition, the height of the end surface of the cylindrical part 8 is the same as the height of the end surface of the bracket 7, and both end surfaces form the same plane. The bracket 7 and the cylindrical portion 8 are surfaces on which the position detection magnet 11 is installed, and the position detection magnet 11 is axially positioned by these. In addition, the bracket 7 can also be formed separately from the cylindrical part 8 .

The outer periphery of the protrusion 5 may be formed in a polygonal shape (octagonal shape as shown). And the hole 15 is circular. The position detection magnet 11 can be fixed to the back yoke 3 by inserting the protrusion 5 into the hole 15 ( FIG. 5( a ), FIG. 5( b )) and thermally welding the tip of the protrusion 5 . Here, if the protrusion 5 is formed in a cylindrical shape, a gap is required between the protrusion 5 and the hole 15 to allow the protrusion 5 to pass through, and this gap becomes a movable gap, so that the rotor magnet 10 and the position detection magnet 11 are the same. Core deterioration.

Therefore, in this embodiment, the dimensions of the protrusion 5 and the hole 15 are designed as follows: the outer periphery of the protrusion 5 is polygonal, and when the protrusion 5 is inserted into the hole 15, the corners of the outer periphery of the protrusion 5 will be covered by the hole. 15 edges are chipped off. By employing such a configuration, the position detecting magnet 11 can be aligned without generating a play gap in a state where the protrusion 5 is inserted into the hole 15 . Therefore, the concentricity between the rotor magnet 10 and the position detection magnet 11 can be improved, and the position detection accuracy of the rotor 20 can be improved, so that the efficiency and performance of the motor 100 can be improved.

In addition, a resin injection port (gate 6 ) for molding the back yoke 3 is provided on the projection 5 . The back yoke 3 is molded by injecting thermoplastic resin containing soft magnets or magnetic powder through the gate 6 . In general, when cutting the gate provided on the end face of the back yoke 3, since the cut part protrudes from the end face, it will cause trouble. Therefore, by providing a recess around the gate so that the cut part does not protrude from the end face Prevent bad situations. However, since the provision of the recess in the back yoke 3 reduces the magnet amount of the rotor magnet 10 and the rotor magnet 10 becomes unbalanced, it causes a drop in magnetic force and a deterioration in the distortion rate of the magnetic flux density distribution, possibly resulting in a decrease in the efficiency and performance of the motor 100. decline.

In the present embodiment, since the gate 6 is provided on the projection 5 which is melted by thermally welding the front end, there is no possibility of poor quality due to protrusion of the gate cutting portion, and since there is no need to install a gate on the rotor magnet 10 The recess can prevent the efficiency and performance of the motor 100 from being degraded.

Furthermore, in this embodiment, since the protrusion 5 is provided on the bracket 7, even if the position detection magnet 11 is pressed when the front end portion of the protrusion 5 is thermally welded, the position detection magnet 11 can be prevented from being damaged by the bracket 7. 11. The floating and deformation can improve the quality of assembly.

Furthermore, in this embodiment, since the height of the protrusion 5 is made shorter than the axial length from one end of the shaft 1 on the protrusion 5 side to the end surface of the bracket 7, when the position detection magnet 11 is attached to the rotor magnet, At 10 o'clock, before making the protrusion 5 penetrate the hole 15 of the magnet 11 for position detection, the shaft 1 is inserted through the shaft hole 13 of the magnet 11 for position detection (Fig. 5(a), Fig. 5(b)), so The positioning of the position detection magnet 11 and the rotor magnet 10 is performed to facilitate assembly.

The rotor magnet 10 is formed by setting the back yoke 3 in a mold and molding the plastic magnet 9 integrally with the outer peripheral surface of the back yoke 3 . At this time, since the wave shape of the outer periphery of the back yoke 3 is transferred to the inner periphery of the plastic magnet 9 and the two are engaged with each other, the wave shape of the inner periphery of the plastic magnet 9 has the effect of preventing rotation. In addition, since the outer periphery of the back yoke 3 has a wave shape to form a magnetic circuit, the magnetic flux density distribution can be adjusted arbitrarily.

In addition, the rotor magnet 10 adopts a structure in which the plastic magnet 9 is molded on the outer peripheral surface of the back yoke 3, but it is also possible to make the entire rotor magnet 10 consist of plastic magnets. same effect.

FIG. 5( a ) is a plan view of the position detection magnet 11 , and FIG. 5( b ) is an X-X cross-sectional view of FIG. 5( a ). As shown in FIG. 5( a ) and FIG. 5( b ), the magnet 11 for position detection is annular in shape with a shaft hole 13 provided in the center. The magnet 11 for position detection has a cylindrical portion 12 provided with a shaft hole 13 on the inner diameter side, and has an annular detected portion 14 on the outer diameter side, which is arranged opposite to the magnetic force detection element 47 in the axial direction and is used for position detection. used in . Here, the cylindrical portion 12 is provided around the shaft 1 . In addition, the base 16, which is a portion of the position detection magnet 11 that is located on the outer diameter side of the cylindrical portion 12 and on the inner diameter side of the detected portion 14, is flat and ring-shaped. A plurality of holes 15 . The holes 15 are provided at positions corresponding to the protrusions 5 of the rotor magnet 10 . In addition, the thickness of the cylindrical portion 12 is thicker than that of the base portion 16 which is the portion to be detected 14 and the portion provided with the hole 15 . The detected portion 14 is thicker than the portion where the hole 15 is provided, that is, the base portion 16 . In addition, the position detection magnet 11 is asymmetrical in the axial direction, and the rotor magnet 10 side is planar. Therefore, the cylindrical portion 12 protrudes toward the side opposite to the rotor magnet 10 side than the base portion 16 and the detected portion 14 . Furthermore, the detected portion 14 protrudes toward the side opposite to the rotor magnet 10 side than the base portion 16 .

The position detection magnet 11 is fixed to the rotor magnet 10 by inserting the protrusion 5 of the rotor magnet 10 into the hole 15 and thermally welding the tip of the protrusion 5 . In this way, since the position detection magnet 11 is mechanically fixed to the rotor magnet 10, the reliability of assembly can be improved. In addition, since the thickness of the magnet 11 for position detection is set so that the thickness of the portion where the hole 15 is provided is the thinnest, the height and position of the thermally welded portion 35 formed by thermally welding the front end of the protrusion 5 can be detected. The detected part 14 of the magnet 11 is the same as or lower than it. As a result, when assembling the motor, the thermally welded portion 35 does not come into contact with the molded stator, thereby improving assembly reliability.

The outer diameter of the cylindrical portion 12 is equal to or slightly larger than the outer diameter of the inner ring of the bearing 21 , and smaller than the inner diameter of the outer ring of the bearing 21 , and only abuts against the inner ring of the bearing 21 . The positioning of the bearing 21 is performed by press-fitting the bearing 21 along the shaft 1 until it abuts against the end surface of the cylindrical portion 12 . The bearing 21 is disposed on the inner diameter side of the detected portion 14 .

In this way, in the present embodiment, in the rotor 20, the distance between the detected portion 14 of the position detection magnet 11 and the magnetic force detection element 47 of the substrate 46 is determined only by the position detection magnet 11, so that the management and adjustment of the size become easier. easy. Therefore, the accuracy of the distance between the detected portion 14 and the magnetic force detection element 47 can be improved, so that the position of the rotor 20 can be detected with high accuracy, and the controllability and performance of the motor 100 can be improved.

6( a ), FIG. 6( b ), and FIG. 6( c ) show the assembly of the rotor 20 . Fig. 6 (a) is a perspective view of the rotor magnet 10 and the position detection magnet 11 before the position detection magnet 11 is attached to the rotor magnet 10, and Fig. 6 (b) is a perspective view of the rotor magnet 10 after the position detection magnet 11 is attached. 6( c ) is a perspective view of the rotor magnet 10 after the position detection magnet 11 is fixed by heat welding the front end of the protrusion 5 .

The end face of the rotor magnet 10 provided with the bracket 7 faces the plane of the position detection magnet 11, and the shaft 1 of the rotor magnet 10 is inserted into the shaft hole 13 of the position detection magnet 11 (FIG. 6(a)). First, by inserting the shaft 1 into the shaft hole 13 of the cylindrical portion 12, the rotor magnet 10 and the position detection magnet 11 are roughly centered, and the protrusion 5 of the rotor magnet 10 is aligned with the position detection magnet 11. 15's positioning made easy.

The plurality of protrusions 5 of the rotor magnet 10 are inserted into the plurality of holes 15 of the position detection magnet 11, and the position detection magnet 11 is mounted to a position where it abuts against the bracket 7 of the rotor magnet 10 (FIG. 6(b) ). At this time, when the polygonal protrusion 5 of the rotor magnet 10 is inserted into the hole 15 of the position detection magnet 11, since the corners of the outer periphery are cut off, no play gap occurs, and the position detection magnet 11 can be aligned. Therefore, the concentricity between the rotor magnet 10 and the position detection magnet 11 can be improved, and the position of the rotor 20 can be detected with high precision, so that the efficiency and performance of the motor 100 can be improved.

By thermally welding the front end of the protrusion 5 of the rotor magnet 10 protruding from the hole 15 of the position detection magnet 11, the position detection magnet 11 is fixed to the rotor magnet 10, thereby forming the rotor 20 (FIG. 6(c), FIG. 3(a), Figure 3(b)).

FIG. 7 is a manufacturing flowchart showing a method of manufacturing the rotor of the electric motor according to the present embodiment. The manufacturing method of the rotor of an electric motor is roughly as follows.

(1) Step 1: Carry out machining of axis 1. Then, the position detection magnet 11 is molded, and the position detection magnet 11 is demagnetized after the molding. the

(2) Step 2: Carry out molding of the back yoke 3, and demagnetize the back yoke 3 after molding. the

(3) Step 3: Carry out molding of the plastic magnet 9 . That is, the rotor magnet 10 is produced by integrally forming the plastic magnet 9 and the outer peripheral surface of the back yoke 3 by injection molding. The rotor magnet 10 is demagnetized after making.

(4) Step 4: The position detection magnet 11 is attached to the rotor magnet 10 . At this time, the protrusion 5 of the rotor magnet 10 is inserted into the hole 15 of the position detection magnet 11 , and the position detection magnet 11 is attached so as to be in contact with the bracket 7 .

(5) Step 5: The front end portion of the protrusion 5 is thermally welded to fix the position detection magnet 11 to the rotor magnet 10 to manufacture the rotor 20 .

(6) Step 6: Magnetizing the rotor 20 . the

(7) Step 7: The bearing 21 is press-fitted along the shaft 1 until it abuts against the cylindrical portion 12 of the position detection magnet 11 and the bearing abutting portion 4 of the rotor magnet 10 . the

As described above, in this embodiment, one bearing 21 is brought into contact with the bearing contact portion 4 of the rotor magnet 10 for positioning, and the other bearing 21 is brought into contact with the end surface of the cylindrical portion 12 of the position detection magnet 11 . for positioning. In this way, the bearing 21 on the side of the position detection magnet 11 is positioned only by the cylindrical portion 12 of the position detection magnet 11, so that the distance between the detected portion 14 of the position detection magnet 11 and the magnetic force detection element 47 in the rotor 20 is only It is determined by the magnet 11 for position detection. Therefore, compared with the case involving a plurality of components, the management and adjustment of the dimensions are relatively easy, and the assembly accuracy can be improved, the position of the rotor 20 can be detected with high precision, and the controllability, performance, and reliability of the motor 100 can be realized. improvement. In addition, by directly positioning the bearing 21 on the side of the position detecting magnet 11 with the position detecting magnet 11, the number of components can be reduced, and the cost can also be reduced.

In addition, in this embodiment, the protrusion 5 of the rotor magnet 10 is inserted into the hole 15 of the position detection magnet 11, the position detection magnet 11 is brought into contact with the bracket 7, and the front end of the protrusion 5 is thermally welded. , thereby fixing the position detection magnet 11 to the rotor magnet 10 , and providing the molding gate 6 on the projection 5 . In this way, since the front end portion of the protrusion 5 provided with the gate 6 is thermally welded, the cut portion of the gate 6 does not protrude, and it is possible to prevent the protrusion of the cut portion from coming into contact with other portions or leakage of resin powder from the cut portion. bad situation. In addition, since there is no need to provide a concave portion on the end surface of the rotor magnet 10 to prevent the protruding portion of the cut portion, it is possible to prevent a decrease in magnetic force and deterioration of the distortion rate of the magnetic flux density distribution, thereby improving the efficiency and performance of the motor 100.

In addition, in this embodiment, the position detection magnet 11 is fixed to the rotor magnet 10 by thermally welding the front-end|tip part of the protrusion 5. As shown in FIG. In this way, since the position detection magnet 11 is mechanically fixed to the rotor magnet 10, the reliability of assembly can be improved. In addition, since the position detection magnet 11 can be fixed to the rotor magnet 10 through such a simple process, cost can also be reduced. In addition, since the height of the thermally welded portion 35 is the same as or lower than the detected portion 14 of the position detection magnet 11, the thermally welded portion 35 will not come into contact with the molded stator when assembling the motor, thereby improving the reliability of assembly. sex.

In addition, in this embodiment, since the protrusion 5 is provided on the bracket 7, even if the position detection magnet 11 is pressed when the protrusion 5 is thermally welded, the position detection magnet 11 can be prevented from floating by the bracket 7. Lifting and deformation can improve the quality of assembly.

In addition, in this embodiment, since the press-fit load to the bearing 21 is supported by the cylindrical portion 12 of the magnet 11 for position detection and the cylindrical portion 8 of the rotor magnet 10, deformation of the magnet 11 for position detection can be prevented. Improve the quality of assembly.

In addition, in this embodiment, although the cylindrical part of the magnet 11 for position detection is made into the cylindrical part 12, this cylindrical part may be a cylindrical shape other than a cylindrical shape. In addition, in this embodiment, the cylindrical part of the rotor magnet 10 is made into the cylindrical part 8, However, this cylindrical part may be a cylindrical shape other than a cylindrical shape.

In addition, other effects of this embodiment are as described above together with the description of the structure.

Embodiment 2

FIG. 8 is a diagram showing an example of the configuration of the air conditioner according to the present embodiment. The air conditioner 300 has an indoor unit 310 and an outdoor unit 320 connected to the indoor unit 310 . An indoor unit blower (not shown) is mounted on the indoor unit 310 , and an outdoor unit blower 330 is mounted on the outdoor unit 320 . In addition, the motor 100 according to Embodiment 1 is used as a driving source for the blower 330 for an outdoor unit and the blower for an indoor unit. The performance of the air conditioner 300 can be improved by using the motor 100 for the outdoor unit blower 330 and the indoor unit blower which are main components of the air conditioner 300 .

In addition, the electric motor of Embodiment 1 can also be mounted in electronic equipment other than an air conditioner, and also in this case, the effect similar to this Embodiment can be acquired.

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

Claims (10)

1. a rotor for motor, is characterized in that, comprising:

Axle;

Rotor magnet, it is arranged integratedly with this axle around described axle;

Position probing magnet, it is arranged on an end of the axis of described rotor magnet, and is provided with the axis hole inserted for described axle; And

Pair of bearings, it is installed on described axle in the both sides of described rotor magnet, wherein

Described position probing magnet has the cylindrical portion of the surrounding being arranged on described axle,

A bearing in described pair of bearings abuts with the end face of described cylindrical portion and is located.

2. the rotor of motor according to claim 1, is characterized in that:

Described rotor magnet comprises:

Bracket, it is arranged on the end face of described position probing magnet side; And

Projection, it is arranged on described bracket, and is provided with shaping cast gate,

Described position probing magnet has the hole of inserting for described projection,

Described projection is inserted in the hole, described position probing magnet is abutted with described bracket, and by the leading section thermal welding by described projection, described position probing magnet is fixed on described rotor magnet.

3. the rotor of motor according to claim 2, is characterized in that:

Described rotor magnet has from the outstanding cylindrical portion of the end face of described position probing magnet side in the position by internal side diameter compared with being provided with the position of described bracket,

The end face of the described cylindrical portion of described rotor magnet and the end face of described bracket form the same face,

Described bracket and the described cylindrical portion of described position probing magnet and described rotor magnet abut and are installed on described rotor magnet.

4. the rotor of motor according to claim 2, is characterized in that:

Detected portion axially opposed with the magnetic detecting element of stator described in described position probing magnet is included in,

Described in the aspect ratio of having carried out the leading section of the described projection of thermal welding, detected portion is low.

5. the rotor of motor according to claim 4, is characterized in that:

The cylindrical portion of this position probing magnet of the wall ratio being provided with the part in described hole of described position probing magnet and the wall thickness of detected portion thin.

6. the rotor of motor according to claim 2, is characterized in that:

The periphery of described projection is polygonal shape,

Described hole is circular,

Being dimensioned to of described projection and described hole: when described projection being inserted in the hole, the angle of the periphery of described projection can be reamed by the edge in described hole.

7. the rotor of motor according to claim 2, is characterized in that:

The axial length of aspect ratio from one end of the described raised sides of described axle to the end face of described bracket of described projection is short.

8. the rotor of motor according to claim 1, is characterized in that:

Another bearing in described pair of bearings abuts with the bearing abutting part of the internal side diameter being arranged on described rotor magnet and is located.

9. a motor, is characterized in that, comprising:

The rotor of the motor according to any one of claim 1 to 8.

10. an air conditioner, is characterized in that:

Be equipped with motor according to claim 9.