JP2009011010A - Motor, coupling member, and method of coupling motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor which can regulate generated noise by suppressing the vibration of a stator transmitted to a housing. <P>SOLUTION: A portion in the axial direction between the position of an end face, which accords with the end face of the stator, and the position of an adjacent end face is made a coupling position, and the housing and the stator are coupled with each other in the coupling position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric motor that generates an exciting force in a radial direction, a connecting member that connects the electric motor to a housing, and an electric motor connecting method.

As this type of technology, the technology described in Patent Document 1 is disclosed. In this publication, the rotor is divided into a plurality of rotor pieces with respect to the axial length of the rotor so that the permanent magnets of adjacent rotor pieces have an electrical angle phase difference of 0, π in the circumferential direction of the rotor. It is arranged.
JP 2004-357405 A

  In the prior art described in Patent Document 1, a radial excitation force is generated between the stator and the rotor that changes its direction in accordance with the phase change. The excitation force is in the opposite direction with respect to the dividing surface of the rotor, so the forces cancel each other on the dividing surface of the rotor, but the excitation force acts on the part other than the dividing surface, so that vibration is generated in the stator. appear. There has been a problem that the vibration of the stator is transmitted to the housing to generate noise.

  The present invention has been made paying attention to the above problems, and an object of the present invention is to provide an electric motor capable of suppressing the generated noise by suppressing the vibration of the stator transmitted to the housing.

  In order to achieve the above object, according to the present invention, a connection position is defined between an end face position that coincides with the end face of the stator in the axial direction and an adjacent end face position, and the housing and the stator are connected at the connection position. did.

  Therefore, vibrations having both ends of the stator as antinodes and the joint surface position as nodes can be generated in the stator, and can be connected to the housing via a connecting member at a position where the displacement of the stator is small. Become. Therefore, the displacement amount of the vibration transmitted from the stator to the housing can be reduced, and the displacement amount of the vibration of the housing can be suppressed to reduce the noise of the electric motor.

  Hereinafter, the best mode of the present invention will be described with reference to the drawings.

First, the configuration will be described.
[Configuration of electric motor]
1A and 1B are cross-sectional views of the electric motor 1. FIG. 1A is a cross-sectional view taken along line AA in FIG. 1B, and FIG. 1B is an axial cross-sectional view. The electric motor 1 is formed of a rotor 3 provided around a shaft 2 and a stator 4 that is disposed on the outer periphery of the rotor 3 and includes a plurality of electromagnetic coils. The rotor 3 and the stator 4 are formed in a space defined by a cylindrical housing 5, a front cover 6 that closes an opening at one end of the housing 5, and a rear cover 7 that closes an opening at the other end. Is housed in.

  The rotor 3 is composed of two permanent magnets, a first piece 3a and a second piece 3b, which are divided in the axial direction. A connection surface 3c is formed between the first piece 3a and the second piece 3b. Assuming that the overall axial length of the rotor 3 is 2L, the first piece 3a and the second piece 3b are each formed with an axial length L. The first piece 3a and the second piece 3b are fixed to the shaft 2 so that the phase of the electrical angle is shifted by π. The shaft 2 is supported by a front cover 6 via a bearing 8 and a rear cover 7 via a bearing 9.

The stator 4 is formed from a plurality of electromagnetic coils. The stator 4 is shrink-fitted to the connecting member 10 and is fixed to the housing 5 via the connecting member 10.
For the following description, the position of the stator 4 facing the first piece 3a of the rotor 3 is the first piece position 4a, and the position of the stator 4 facing the second piece 3b of the rotor 3 is the second piece position 4b. The position of the stator 4 facing the connection surface 3c of the rotor 3 is defined as a connection surface position 4c.

  The connecting member 10 is provided with a convex portion 10a at a position that is the outer peripheral surface of the connecting member 10 and substantially coincides with the position of the connecting surface 3c of the rotor 3 in the axial direction. The housing 5 is provided with a convex portion 5a at a position that is an inner peripheral surface of the housing 5 and substantially coincides with the position of the connection surface 3c of the rotor 3 in the axial direction. The connecting member 10 and the housing 5 are fastened by bolts 11 at the convex portions 10a and the convex portions 5a.

  A water channel 12 is provided between the inner peripheral side of the housing 5 and the outer peripheral side of the connecting member 10. Through holes 5b and 10b are formed between the adjacent bolts 11, and the front cover 6 side and the rear cover 7 side of the water channel 12 are communicated with each other.

[Excitation force]
Since the rotor 3 is fixed to the shaft 2 so that the phase of the first piece 3a and the second piece 3b is shifted by π, the rotor 3 is generated between the first piece position 4a of the stator 4 and the first piece 3a. The magnetic force generated between the second piece position 4b of the stator 4 and the second piece 3b is in the opposite direction. An exciting force acts on the stator 4 by the magnetic force generated between the stator 4 and the rotor 3.
FIG. 2 is a schematic diagram showing the excitation force acting on the stator 4. FIG. 2 (a) shows the phase π / 2 when the position of the rotor 3 is phase 0 (zero). 2 (c) shows the phase π, and FIG. 2 (d) shows the phase 3π / 2. In addition, the arrow of FIG. 2 shows the direction of an exciting force.

  When the position of the rotor 3 is in phase 0 (zero), a repulsive force is generated between the first piece 3a of the rotor 3 and the first piece position 4a of the stator 4 as shown in FIG. The exciting force acts on the first piece position 4a radially outward. Further, a suction force acts between the second piece 3b of the rotor 3 and the second piece position 4b of the stator 4, and an excitation force acts radially inward on the second piece position 4b.

  When the position of the rotor 3 is the phase π / 2, as shown in FIG. 2B, between the first piece 3a of the rotor 3 and the first piece position 4a of the stator 4, and of the rotor 3 Since no repulsive force / suction force acts between the second piece 3b and the second piece position 4b of the stator 4, no exciting force acts on the stator 4.

  When the position of the rotor 3 is a phase 3π / 2, as shown in FIG. 2C, an attractive force acts between the first piece 3a of the rotor 3 and the first piece position 4a of the stator 4. Thus, an excitation force acts on the first piece position 4a radially inward. Further, a repulsive force acts between the second piece 3b of the rotor 3 and the second piece position 4b of the stator 4, and an exciting force acts radially outward on the second piece position 4b.

When the position of the rotor 3 is the phase 3π / 2, as shown in FIG. 2D, the position between the first piece 3a of the rotor 3 and the first piece position 4a of the stator 4 and the rotor 3 Since no repulsive force / suction force acts between the second piece 3b and the second piece position 4b of the stator 4, no exciting force acts on the stator 4.
As described above, since the exciting force acts in the opposite direction on the first piece position 4a and the second piece position 4b of the stator 4, the exciting force cancels out and the exciting force does not act at the connection surface position 4c.

  FIG. 3 is a graph showing the magnitude of the excitation force acting on the stator 4. The solid line indicates the first piece position 4a of the stator 4, the one-dot chain line indicates the second piece position 4b, and the dotted line indicates the excitation force at the connection surface position 4c. As shown in FIG. 3, the excitation force acting on the first piece position 4a and the second piece position 4b of the stator 4 changes in a cycle of 2π, but the excitation force acting on the connection surface position 4c is always 0. (Zero).

[Stator displacement]
Since the rotor 3 is divided into two pieces, a first piece 3a and a second piece 3b, and the phase of the electrical angle of the first piece 3a and the second piece 3b is shifted by π, the stator 4 is fixed by an excitation force. A vibration is generated in which both ends of the child 4 are antinodes and the connection surface position 4c is a node. Hereinafter, the vibration generated in the stator 4 will be described.

  FIG. 4 is a schematic diagram showing the stator 4 that is displaced by the excitation force. FIG. 4A shows a case where the position of the rotor 3 is phase 0 (zero), and FIG. 4B shows a phase π / 2. 4 (c) shows the phase π, and FIG. 4 (d) shows the phase 3π / 2. In FIG. 4, the excitation force is shown in the direction of the arrow.

When the position of the rotor 3 is at phase 0 (zero), as shown in FIG. 4A, an excitation force acts on the first piece position 4a of the stator 4 radially outward and radially outward. Displace. Further, the second piece position 4b of the stator 4 is displaced radially inward by an excitation force acting radially inward. Since the excitation force acts in the opposite direction on the first piece position 4a and the second piece position 4b of the stator 4, and the excitation force does not act on the connection surface position 4c, the connection surface position 4c is displaced. do not do.
When the position of the rotor 3 is a phase π / 2, as shown in FIG. 4B, the excitation force does not act on the first piece position 4a and the second piece position 4b of the stator 4, so that the stator 4 Is not displaced.

When the position of the rotor 3 is a phase 3π / 2, as shown in FIG. 4C, the first piece position 4a of the stator 4 is displaced radially inward by an excitation force acting radially inward. To do. In addition, the second piece position 4b is displaced radially outward by an excitation force acting radially outward. Since the excitation force acts in the opposite direction on the first piece position 4a and the second piece position 4b of the stator 4, and the excitation force cancels out at the connection surface position 4c and no force acts, the connection surface position 4c Does not displace.
When the position of the rotor 3 is the phase 3π / 2, as shown in FIG. 4D, the stator 4 is not displaced because no excitation force acts on the first piece position 4a and the second piece position 4b.

  FIG. 5 is a graph showing the amount of displacement of the stator 4. The solid line indicates the first piece position 4a, the alternate long and short dash line indicates the second piece position 4b, and the dotted line indicates the amount of displacement at the connection surface position 4c. As shown in FIG. 5, the displacement amount of the first piece position 4a and the second piece position 4b changes in a cycle of 2π, but the displacement amount of the connection surface position 4c is always 0 (zero).

[Housing displacement]
FIG. 6 is a cross-sectional view of the electric motor 1 of the comparative example. In the electric motor 1 of the first embodiment, the stator 4 is shrink-fitted to the connecting member 10 and is fixed to the housing 5 via the connecting member 10. On the other hand, in the electric motor 1 of the comparative example, the stator 4 is directly shrink-fitted on the housing 5. 6A is a cross-sectional view taken along the line AA in FIG. 6B, and FIG. 6B is an axial cross-sectional view. About the same structure as FIG. 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.
The stator 4 is directly shrink fitted on the housing 5. The housing 5 has a through hole formed in the axial direction, and a water channel 12 is formed by the through hole.

  FIG. 7 is a schematic diagram showing vibration of the housing 5. Since the stator 4 is directly shrink-fitted to the housing 5, the vibration of the stator 4 is directly transmitted to the housing 5 as shown in FIG. 7. As for the vibration generated in the stator 4, the connection surface position 4 c is a node, and both ends of the stator 4 are antinodes. Therefore, the displacement amount of both ends of the housing 5 becomes large and the electric motor 1 may generate a large noise. .

Moreover, although the vibration of the housing 5 can be suppressed by increasing the thickness of the housing 5, the diameter of the housing is enlarged and the mountability of the electric motor 1 is deteriorated.
Further, by reducing the output of the electric motor 1, the vibration of the stator 4 can be suppressed and the vibration transmitted to the housing 5 can be suppressed, but sufficient power performance of the electric motor 1 cannot be ensured.

  Therefore, in the electric motor 1 according to the first embodiment, the stator 4 is shrink-fitted to the connecting member 10, and the projection 10 a of the connecting member 10 provided at a position substantially coincident with the connecting surface 3 c of the rotor 3 in the axial direction and the housing 5. The convex portion 5 a was fastened with a bolt 11.

[Displacement of connecting member]
In the electric motor 1 of the first embodiment, since the stator 4 is shrink-fitted to the connecting member 10, the connecting member 10 vibrates integrally with the stator 4. As described above, the connection surface position 4c of the stator 4 becomes a vibration node of the stator 4, and the position of the connection surface 3c of the rotor 3 near the vibration node of the stator 4 (the connection surface of the stator 4). Since the convex portion 10a of the connecting member 10 is provided at a position that substantially coincides with the position 4c) in the axial direction, the amount of displacement of the convex portion 10a can be made smaller than that of the other connecting member 10 portions. Hereinafter, the displacement of the connecting member 10 and the convex portion 10a will be described.

  FIG. 8 is a schematic diagram showing the displacement of the connecting member 10, FIG. 8 (a) is when the position of the rotor 3 is phase 0 (zero), and FIG. 8 (b) is when the phase is π / 2. 8 (c) shows the phase π, and FIG. 8 (d) shows the phase 3π / 2.

When the position of the rotor 3 is in phase 0 (zero), the first piece position 4a of the stator 4 is displaced radially outward as shown in FIG. The 4a side is displaced radially outward. Further, since the second piece position 4b of the stator 4 is displaced radially inward, the second piece position 4b side of the connecting member 10 is displaced radially inward. At this time, the convex portion 10a of the connecting member 10 is hardly displaced in the radial direction.
When the position of the rotor 3 is the phase π / 2, as shown in FIG. 8B, the stator 4 is not displaced, so that the connecting member 10 is not displaced.

When the position of the rotor 3 is in the phase 3π / 2, as shown in FIG. 8C, the first piece position 4a of the stator 4 is displaced radially inward, so that the first piece position 4a of the connecting member 10 is displaced. The side is displaced radially inward. Further, since the second piece position 4b of the stator 4 is displaced radially outward, the second piece position 4b side of the connecting member 10 is displaced radially outward. At this time, the convex portion 10b of the connecting member 10 is hardly displaced in the radial direction.
When the position of the rotor 3 is the phase 3π / 2, as shown in FIG. 8D, the stator 4 is not displaced, so that the connecting member 10 is not displaced.

[Operation by Configuration of Example 1]
In the electric motor 1 of the first embodiment, the stator 4 is formed from a plurality of electromagnetic coils, and the rotor 3 is formed from two permanent magnets of a first piece 3a and a second piece 3b that are divided in the axial direction. The piece 3a and the second piece 3b were fixed to the shaft 2 so that the electrical angle phase was shifted by π. Therefore, the exciting force in the reverse direction acts on the first piece position 4a and the second piece position 4b of the stator 4, and the exciting force cancels out at the connecting surface position 4c, so that no force acts on the stator 4 It is possible to cause the stator 4 to generate vibration having both ends of the antinode as the belly and the connection surface position 4c as a node.

  In addition, the stator 4 is shrink-fitted onto the connecting member 10, and the convex portion 10 a of the connecting member 10 and the convex portion 5 a of the housing 5 formed at a position substantially coincident with the position of the connection surface 3 c of the rotor 3 in the axial direction, The stator 4 and the housing 5 are connected. FIG. 9 is a schematic diagram showing the displacement transmitted to the housing 5. Since the connecting member 10 and the housing 5 are connected in the vicinity of the vibration node of the stator 4, vibration transmitted from the stator 4 to the housing 5 can be suppressed.

  Further, since only the convex portion 5a is the part where the displacement is input to the housing 5, the range of the displacement input to the housing 5 can be reduced.

[Effect of Example 1]
(1) It has a permanent magnet composed of two first pieces 3a and second pieces 3b with respect to the axial direction, and the permanent magnet has a connection surface 3c between the adjacent pieces, and the phase of the electrical angle of the adjacent pieces. In an electric motor 1 including a rotor 3 in which permanent magnets are arranged so as to be shifted by π, a stator 4 having a plurality of electromagnetic coils on a surface facing the rotor 3, and a housing 5 that supports the stator 4. A connection position between an end face position that coincides with one end face of the stator 4 with respect to the axial direction and an end face position that coincides with the other end face is a connection position, and the housing 5 and the stator 4 are connected at this connection position. Member 10 was provided.

  Therefore, vibrations having both ends of the stator 4 as antinodes and the connection surface position 4c as nodes can be generated in the stator 4, and the housing 5 is connected to the housing 5 via the connecting member 10 at a position where the displacement amount of the stator 4 is small. This is possible when connected. Therefore, the displacement amount of the vibration transmitted from the stator 4 to the housing 5 can be reduced, the displacement amount of the vibration of the housing 5 can be suppressed, and the noise of the motor 1 can be reduced.

(2) The convex portion 10a of the connecting member 10 and the convex portion 5a of the housing 5 are provided at positions that coincide with the connecting surface 3c of the rotor 3 in the axial direction, and the stator 4 is attached to the housing 5 via the connecting member 10. Fixed.
Therefore, the stator 4 can be connected to the housing 5 at the position where the displacement amount is the smallest, and the displacement amount transmitted to the housing 5 can be reduced. As a result, the amount of vibration displacement of the housing 5 can be suppressed, and the noise of the electric motor 1 can be reduced.

  In the electric motor 1 of the first embodiment, the rotor 3 is divided into two pieces, that is, a first piece 3a and a second piece 3b. In contrast, the electric motor 1 of the second embodiment differs from the electric motor 1 of the first embodiment in that the rotor 3 is divided into three pieces, a first piece 3d, a second piece 3e, and a third piece 3f. Hereinafter, although the electric motor 1 of Example 2 is demonstrated, about the structure similar to the electric motor 1 of Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

[Configuration of electric motor]
FIG. 10 is a cross-sectional view of the electric motor 1. FIG. 10 (a) is a cross-sectional view along AA in FIG. 10 (c), FIG. 10 (b) is a cross-sectional view along BB in FIG. 10 (c), and FIG. It is an axial sectional view.
The rotor 3 is composed of three permanent magnets, a first piece 3d, a second piece 3e, and a third piece f, which are divided in the axial direction. A first connection surface 3g is formed between the first piece 3d and the second piece 3e, and a second connection surface 3h is formed between the second piece 3e and the third piece 3f. The first piece 3d and the second piece 3e are fixed to the shaft 2 so that the phase of the electrical angle is shifted by π. Similarly, the second piece 3e and the third piece 3f are fixed to the shaft 2 so that the phase of the electrical angle is shifted by π.

The stator 4 is shrink-fitted to the connecting member 10 and is fixed to the housing 5 via the connecting member 10.
Hereinafter, for explanation, the position of the stator 4 facing the first piece 3d of the rotor 3 is the first piece position 4d, and the position of the stator 4 facing the second piece 3e of the rotor 3 is the second piece position. 4e, the position of the stator 4 facing the third piece 3f of the rotor 3 is the third piece position 4f, the position of the stator 4 facing the first connection surface 3g of the rotor 3 is the first connection surface position 4g, The position of the stator 4 facing the second connection surface 3h of the rotor 3 is defined as a second connection surface position 4h.

  The connecting member 10 includes a first convex portion 10c and a second protruding portion on the outer peripheral surface of the connecting member 10 at positions that substantially coincide with the positions of the first connecting surface 3g and the second connecting surface 3h of the rotor 3 in the axial direction. A convex portion 10d is formed. The outer diameter of the first convex portion 10c is formed larger than the outer diameter of the second convex portion 10d.

Further, the housing 5 includes a first convex portion 5c and a second convex portion at the inner peripheral surface of the housing 5 at positions that substantially coincide with the positions of the first connection surface 3g and the second connection surface 3h of the rotor 3 in the axial direction. A convex portion 5d is formed. The inner diameter of the first convex part 5 c of the housing 5 is formed larger than the outer diameter of the second convex part 10 d of the connecting member 10. The inner diameter of the second convex portion 5d of the housing 5 is such that the side surface of the second convex portion 5d of the housing 5 and the side surface of the second convex portion 10d of the connecting member 10 when the connecting member 10 is inserted from the front cover 6 side. Is formed to be smaller than the outer diameter of the second convex portion 10d. The outer diameter of the first convex portion 10c of the connecting member 10 is such that when the connecting member 10 is inserted from the front cover 6 side, the side surface of the first convex portion 10c of the connecting member 10 and the first convex portion 5c of the housing 5 are arranged. It is formed larger than the inner diameter of the first convex portion 5c so that the side surface comes into contact.
The connecting member 10 and the housing 5 are fastened by a bolt 11a at the first convex portion 10c and the first convex portion 5c, and by a bolt 11b at the second convex portion 10d and the second convex portion 5d.

  A water channel 12 is provided between the inner peripheral side of the housing 5 and the outer peripheral side of the connecting member 10. Through holes 5e and 10e are formed between positions where the first convex portion 5c of the housing 5 and the second convex portion 10d of the connecting member 10 are fastened by the bolt 11a. Further, through holes 5f and 10f are formed between positions where the second convex portion 5d of the housing 5 and the second convex portion 10d of the connecting member 10 are fastened by the bolts 11b. The front cover 6 side and the rear cover 7 side of the water channel 12 are communicated with each other by the through holes 5e and 10e and the through holes 5f and 10f.

[Excitation force]
In the electric motor 1 of the second embodiment, the exciting force in the opposite direction acts on the first piece position 4d and the second piece position 4e adjacent to each other and the second piece position 4e and the third piece position 4f of the stator 4 respectively. . Hereinafter, the excitation force acting on the stator 4 will be described.

  The rotor 3 is generated between the first piece position 4d and the first piece 3d of the stator 4 because the first piece 3d and the second piece 3e are fixed to the shaft 2 so that the phase is shifted by π. The magnetic force generated between the second piece position 4e and the second piece 3e of the stator 4 is in the opposite direction. Further, since the rotor 3 is fixed to the shaft 2 so that the phase of the second piece 3e and the third piece 3f is shifted by π, the rotor 3 is positioned between the second piece position 4e of the stator 4 and the second piece 3e. The magnetic force generated and the magnetic force generated between the third piece position 4f and the third piece 3f of the stator 4 are in opposite directions. An exciting force acts on the stator 4 by the magnetic force generated between the stator 4 and the rotor 3.

FIG. 11 is a schematic diagram showing the excitation force that changes in accordance with the rotation of the rotor 3, and shows the case where the position of the rotor 3 is at phase 0 (zero). In addition, the arrow of FIG. 11 shows the direction of an exciting force.
When the position of the rotor 3 is in phase 0 (zero), a repulsive force acts between the first piece position 3d and the first piece position 4d of the rotor 3 as shown in FIG. An excitation force acts on the position 4d radially outward. Further, a suction force acts between the second piece 3e and the second piece position 4e of the rotor 3, and an exciting force acts on the second piece position 4e radially inward. A repulsive force acts between the third piece 3f and the third piece position 4f of the rotor 3, and an exciting force acts radially outward on the third piece position 4f.

When the position of the rotor 3 is in phase π, a reverse excitation force acts on the stator 4. That is, a vibration force acts on the first piece position 4d radially inward, a vibration force acts on the second piece position 4e radially outward, and a force exerted on the third piece position 4f radially inward. Vibration force acts.
As in the first embodiment, when the position of the rotor 3 is the phase π / 2 and when the position is the phase 3π / 2, no repulsive force / attraction force acts between the rotor 3 and the stator 4. No excitation force acts on 4.

  Since the rotor 3 is divided into three pieces, ie, a first piece 3d, a second piece 3e, and a third piece 3f, the stator 4 has both ends and a center portion of the stator 4 as a belly by an excitation force. A vibration is generated with the connection surface position 4g and the second connection surface position 4h as nodes.

[Displacement of connecting member]
In the electric motor 1 according to the second embodiment, since the stator 4 is shrink-fitted to the connecting member 10, the stator 4 and the connecting member 10 vibrate integrally. As described above, the first connection surface position 4g and the second connection surface position 4h of the stator 4 serve as vibration nodes of the stator 4, and the first connection of the rotor 3 near the vibration node of the stator 4 is performed. The first convex portion 10c of the connecting member 10 and the first projection 10c are arranged at positions substantially coincident with the positions of the surface 3f and the second connection surface 3h (the first connection surface position 4g and the second connection surface position 4h of the stator 4) in the axial direction. Since the two convex portions 10d are provided, the displacement amounts of the first convex portion 10c and the second convex portion 10d can be made smaller than those of the other connecting member 10 portions. Moreover, the axial direction displacement of the 1st convex part 10c and the 2nd convex part 10d of the connection member 10 can be made into a reverse direction. Hereinafter, the displacement of the connecting member 10, the first convex portion 10c, and the second convex portion 10d will be described.

FIG. 12 is a schematic diagram showing the connecting member 10 that is displaced by the stator 4 that is displaced by the excitation force, and shows the case where the position of the rotor 3 is in phase 0 (zero).
When the position of the rotor 3 is at phase 0 (zero), as shown in FIG. 12, the first piece position 4d of the stator 4 is displaced radially outward, so the first piece position 4d side of the connecting member 10 is Displaces radially outward. Further, since the second piece position 4e of the stator 4 is displaced radially outward, the second piece position 4e portion of the connecting member 10 is displaced radially inward. Further, since the third piece position 4f of the stator 4 is displaced radially outward, the third piece position 4f side of the connecting member 10 is displaced radially outward.

  At this time, the first protrusion 10c of the connecting member 10 is hardly displaced in the radial direction, but the first piece position 4d side of the connecting member 10 is displaced radially outward, and the position of the second piece position 4e of the connecting member 10 is Due to the displacement inward in the radial direction, axial vibration occurs due to the bending moment. Further, the second convex portion 10d of the connecting member 10 is hardly displaced in the radial direction, but the position of the second piece position 4d of the connecting member 10 is displaced inward in the radial direction, and the third piece position 4f side of the connecting member 10 is shifted to the third piece position 4f side. Due to the displacement outward in the radial direction, axial vibration occurs due to the bending moment.

[Operation by Configuration of Example 2]
In the electric motor 1 of the second embodiment, the stator 4 is formed from a plurality of electromagnetic coils, and the rotor 3 is composed of three permanent magnets of a first piece 3d, a second piece 3e, and a third piece 3f that are divided in the axial direction. The first piece 3d and the second piece 3e, and the second piece 3e and the third piece 3f were fixed to the shaft 2 so that the electrical angle phase was shifted by π. Therefore, an excitation force in the opposite direction acts on the first piece position 4d and the second piece position 4e, and the second piece position 4e and the third piece position 4f of the stator 4, and the first connection surface position 4g and the second piece position 4f. At the connection surface position 4h, the excitation force cancels out and no force in the radial direction acts. Therefore, it is possible to cause the stator 4 to generate vibrations having the both ends and the center of the stator 4 as antinodes, and the first connection surface position 4g and the second connection surface position 4h as nodes.

Further, the first protrusion of the connecting member 10 is formed by shrink-fitting the stator 4 to the connecting member 10 and forming the first connecting surface 3g and the second connecting surface 3h of the rotor 3 substantially in the axial direction. The stator 4 and the housing 5 are coupled by the first convex portion 5c and the second convex portion 5d of the housing 5 and the first convex portion 10c and the second convex portion 10d. FIG. 13 is a schematic diagram illustrating displacement transmitted from the stator 4 to the housing 5 in the electric motor 1 of the first embodiment.
Since the connecting member 10 and the housing 5 are connected in the vicinity of the vibration node of the stator 4, vibration transmitted from the stator 4 to the housing 5 can be suppressed.

  Further, the axial vibration transmitted from the first convex portion 10 c of the connecting member 10 to the first convex portion 5 c of the stator 4, and the second convex portion 10 d of the connecting member 10 to the second convex portion 5 d of the stator 4. Since the transmitted axial vibrations are opposite to each other, the axial vibrations are canceled in the housing 5 and the vibrations of the housing 5 can be suppressed.

[Effect of Example 2]
(3) A permanent magnet having a plurality of pieces (first piece 3d, second piece 3e, and third piece 3f) in the axial direction is provided, and a plurality of connection surfaces (first The rotor 3 has a connection surface 3g and a second connection surface 3h), and a rotor 3 in which magnets are arranged so that the phase of the electrical angle of adjacent pieces is shifted by π, and a plurality of electromagnetic coils on the surface facing the rotor 3. In the electric motor 1 including the stator 4 and the housing 5 that supports the stator 4, the center positions of the first connection surface 3g and the second connection surface 3h in the axial direction coincide with the end surface of the stator. A connecting member 10 for connecting the housing 5 and the stator 4 is provided with the end surface position as a connecting position.

  Therefore, vibrations having both ends of the stator 4 and the central portions of the first connection surface 3g and the second connection surface 3h as antinodes and the connection surface position 4c as nodes can be generated in the stator 4. This can be achieved by connecting to the housing 5 via the connecting member 10 at a position where the displacement amount 4 is small. Therefore, the displacement amount of the vibration transmitted from the stator 4 to the housing 5 can be reduced, the displacement amount of the vibration of the housing 5 can be suppressed, and the noise of the motor 1 can be reduced.

(4) The connecting member 10 connects the housing 5 and the stator 4 at two locations of the first convex portion 10c and the second convex portion 10d.
Therefore, the axial vibration transmitted from the first convex portion 10c of the connecting member 10 to the first convex portion 5c of the stator 4 and the second convex portion 10d of the connecting member 10 to the second convex portion 5d of the stator 4 are obtained. Since the transmitted axial vibrations can be opposite to each other, the axial vibration is canceled in the housing 5 and the vibration of the housing 5 can be suppressed.

  In the electric motor 1 of the first embodiment, the stator 4 is fixed to the housing 5 by fastening the convex portion 10 a of the connecting member 10 and the convex portion 5 a of the housing 5. On the other hand, in the electric motor 1 according to the third embodiment, the outer ring 13 is provided, and the convex portion 10a of the connecting member 10 and the axial side surface of the rear cover 7 are connected via the outer ring 13 to connect the stator 4 to the rear cover 7. It differs from the electric motor 1 of Example 1 by the point fixed to. Hereinafter, although the electric motor 1 of Example 2 is demonstrated, about the structure similar to the electric motor 1 of Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

[Configuration of electric motor]
14 is a cross-sectional view of the electric motor 1, FIG. 14 (a) is an axial cross-sectional view, FIG. 14 (b) is a view seen from the direction of the rear cover 7, and FIG. 14 (c) is an AA in FIG. It is sectional drawing.
The electric motor 1 has an outer ring 13. The outer ring 13 is a cylindrical member that is larger in diameter than the connecting member 10 and smaller in diameter than the housing 5. The outer ring 13 is inserted into the outer peripheral side of the connecting member 10 from the rear cover 7 side. One end of the outer ring 13 is fastened to the convex portion 10 a of the connecting member 10 by a bolt 11 c and the other end is fastened to the rear cover 7 by a bolt 14. Has been. A plurality of grooves 13 a are formed on the outer periphery of the outer ring 13 and communicate with the water channel 12.

[Operation by Configuration of Example 3]
In the electric motor 1 of Example 3, the convex portion 10 a of the connecting member 10 and the rear cover 7 are connected by the outer ring 13. FIG. 15 is a schematic diagram showing vibration transmitted to the rear cover 7. When the connecting member 10 is displaced, an axial vibration caused by a bending moment is generated in the convex portion 10a, and the vibration is transmitted to the rear cover 7 through the outer ring 13 by the axial vibration. The vibration transmitted to the rear cover 7 is also transmitted to the housing 5, but the amount of displacement transmitted can be reduced because the vibration is attenuated by the rear cover 7.

  In addition, the rear cover 7 is solid except for the portion where the shaft 2 and the bearing 9 are inserted. Therefore, the rear cover 7 has a high rigidity and further attenuates the transmitted vibration. Therefore, the amount of displacement transmitted to the housing 5 is reduced. be able to. Moreover, since the reduction gear is generally attached to the rear cover 7 and does not come into contact with the outside air, generation of noise can be suppressed.

[Effect of Example 3]
(5) The outer ring 13 that connects the convex portion 10a of the connecting member 10 and the axial side surface of the rear cover 7 is provided.

  That is, the displacement of the connecting member 10 is transmitted to the rear cover 7 through the convex portion 10 a and the outer ring 13. The displacement transmitted to the rear cover 7 is also transmitted to the housing 5, but the amount of displacement transmitted can be reduced because the vibration is attenuated by the rear cover 7.

As mentioned above, although the electric motor 1 of this invention has been demonstrated based on each Example, about a concrete structure, it is not restricted to these Examples, The summary of the invention which concerns on each claim of a claim is shown. Design changes and additions are permissible without departing.
Hereinafter, modifications of each embodiment will be described.

[Modification 1]
Modification 1 is a modification of the second embodiment. In the electric motor 1 according to the second embodiment, in order to insert the connecting member 10 into the housing 5, the first convex portion 10 c and the second convex portion 10 d of the connecting member 10 are formed to have different outer diameters. The inner diameters of the portion 5c and the second convex portion 5d are different. On the other hand, the electric motor 1 of the first modification is formed so that the first protrusions 10c and the second protrusions 10d of the connection member 10 have different circumferential positions in order to insert the connection member 10 into the housing 5. 5 is different from the electric motor 1 of the second embodiment in that the first convex portion 5c and the second convex portion 5d are formed so that the circumferential positions thereof are different.

Hereinafter, although the electric motor 1 of the modification 1 is demonstrated, about the structure similar to the electric motor 1 of Example 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.
16A and 16B are cross-sectional views of the electric motor 1 according to the first modification. FIG. 16A is a cross-sectional view taken along the line AA in FIG. 16C, FIG. 16B is a cross-sectional view taken along the line BB in FIG. (C) is an axial sectional view.

  The first convex portion 10c and the second convex portion 10d of the connecting member 10 are formed so as not to overlap with the circumferential position, and have the same outer diameter. Further, the first convex portion 5c and the second convex portion 5d of the housing 5 are formed so as not to overlap the circumferential position, and are formed to have the same outer diameter. Between the 1st convex part 5c of the housing 5, and the 1st convex part 10c of the connection member 10, the width | variety larger than the width | variety of the 2nd convex part 5d of the housing 5 and the 2nd convex part 10d of the connection member 10 is penetrated. Holes 5g and 10g are formed, and between the second convex portion 5d of the housing 5 and the second convex portion 10d of the connecting member 10, the first convex portion 5c of the housing 5 and the first convex portion 10c of the connecting member 10 are formed. Through-holes 5h and 10h having a width larger than the width are formed.

  When the connecting member 10 is inserted into the housing 5 from the front cover 6 side, the second convex portion 10d of the connecting member 10 can pass through the through hole 10g of the housing 5. Further, when the second convex portion 5d of the housing 5 and the second convex portion 10d of the connecting member 10 are fastened by the bolt 11b, the tool can be inserted into the through holes 5g and 10g from the front cover 6 side. . Therefore, the outer diameter of the first convex portion 10c of the connecting member 10 is equal to the outer diameter of the second convex portion 10d, and the inner diameter of the first convex portion 5c of the housing 5 is equal to the inner diameter of the second convex portion 5d. Thus, the diameter of the housing 5 can be reduced.

[Modification 2]
Modification 2 is a modification of the first embodiment. In the electric motor 1 of the first embodiment, the convex portion 5 a of the housing 5 and the convex portion 10 a of the connecting member 10 are fixed by the bolt 11. On the other hand, the electric motor 1 of the modified example 2 is that the convex part 5a of the housing 5 and the convex part 10a of the connecting member 10 are engaged with each other by a spline and the axial movement is restricted by the C ring 15. Different from the electric motor 1.

Hereinafter, although the electric motor 1 of the modification 2 is demonstrated, about the structure similar to the electric motor 1 of Example 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.
17A and 17B are cross-sectional views of the electric motor 1 according to the second modification. FIG. 17A is a cross-sectional view taken along the line AA in FIG. 17B, and FIG. 17B is an axial cross-sectional view.

  A plurality of convex keys 5j are formed on the convex portion 5a of the housing 5 in the axial direction by partially cutting away the convex portion 5a in the axial direction. The rear cover 7 side of the key 5j has a diameter larger than that of the key 5j. An abutting portion 5i protruding inward in the direction is formed. A key groove 10 i is formed on the outer peripheral side of the convex portion 10 a of the connecting member 10 at a position corresponding to the key 5 j of the housing 5. The connecting member 10 is inserted into the housing 5 from the front cover 6 side, the key 5j of the housing 5 and the key groove 10i of the connecting member 10 are fitted, and the convex portion 10a is in contact with the abutting portion 5i. . A C ring 15 is provided on the front cover side of the convex portion 5a of the housing 5 and the convex portion 10a of the connecting member 10, and the C ring 15 restricts the convex portion 10a from moving in the axial direction with respect to the convex portion 5a. ing.

  With the above configuration, the connecting member 10 and the housing 5 can be connected by one C ring 15, so that the assembly workability of the electric motor 1 is improved. Further, since the housing 5 and the connecting member 10 are fitted by the spline and the axial movement is restricted by the C ring, the spline has a backlash in the axial direction, and the axial component of vibration transmitted from the stator 4 to the housing 5 Can be suppressed.

[Modification 3]
Modification 3 is a modification of the second embodiment. In the electric motor 1 of the second embodiment, the first convex portion 5c of the housing 5 and the first convex portion 10c of the connecting member 10 are connected to the second convex portion 5d of the housing 5 and the second convex portion 10d of the connecting member 10 by the bolt 11a. It was made to fix with the volt | bolt 11b. On the other hand, the electric motor 1 of Modification 3 includes the first convex portion 5c of the housing 5, the first convex portion 10c of the connecting member 10, the second convex portion 5d of the housing 5, and the second convex portion 10d of the connecting member 10. It is different from the electric motor 1 of the second embodiment in that it is fitted by a spline and the axial movement is restricted by the C ring 15.

Hereinafter, although the electric motor 1 of the modification 5 is demonstrated, about the structure similar to the electric motor 1 of Example 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.
18A and 18B are cross-sectional views of the electric motor 1 according to the second modification. FIG. 18A is a cross-sectional view taken along the line AA in FIG. 18B, and FIG. 18B is an axial cross-sectional view.

  The first convex portion 5c of the housing 5 is formed with a plurality of keys 5k convex in the radial direction by partially cutting away the first convex portion 5c in the axial direction. The second convex portion 5d of the housing 5 is formed with a plurality of keys 5m that are convex in the radial direction by partially cutting away the second convex portion 5d in the axial direction. An abutting portion 5n protruding radially inward from 5 m is formed.

  A key groove 10j is formed on the outer peripheral side of the first convex portion 10c of the connecting member 10 at a position corresponding to the key 5k of the housing 5, and on the outer peripheral side of the second convex portion 10d, at a position corresponding to the key 5m. A key groove 10k is formed. The connecting member 10 is inserted into the housing 5 from the front cover 6 side. In the housing 5 and the connecting member 10, the key 5k and the key groove 10j, the key 5m and the key groove 10k are fitted, and the second convex portion 10d. Is in contact with the butting portion 5n. A C-ring 15 is provided on the front cover side of the first convex portion 5c of the housing 5 and the first convex portion 10c of the connecting member 10, and the first convex portion 10c is arranged with respect to the first convex portion 5c by the C-ring 15. Thus, the second convex portion 10d is restricted from moving in the axial direction with respect to the second convex portion 5d.

  With the above configuration, the connecting member 10 and the housing 5 can be connected by one C ring 15, so that the assembly workability of the electric motor 1 is improved. Further, since the housing 5 and the connecting member 10 are fixed by the spline, the spline has a backlash in the axial direction, and transmission of an axial component of vibration transmitted from the stator 4 to the housing 5 can be suppressed.

[Modification 4]
Modification 4 is a modification of the third embodiment.
In the electric motor 1 according to the third embodiment, the outer ring 13 and the convex portion 10a of the connecting member 10 are fixed by the bolt 11c. On the other hand, the electric motor 1 of the modification 3 is different from the electric motor 1 of the embodiment 3 in that the outer ring 13 and the convex portion 10a of the connecting member 10 are fitted by a spline and the axial movement is restricted by the C ring 15.

Hereinafter, although the electric motor 1 of the modification 4 is demonstrated, about the structure similar to the electric motor 1 of Example 3, the same code | symbol is attached | subjected and description is abbreviate | omitted.
19A and 19B are cross-sectional views of the electric motor 1 according to the modified example 4. FIG. 19A is a cross-sectional view along AA in FIG. 19B, FIG. 19B is an axial cross-sectional view, and FIG. It is the figure seen from the side.

  The outer ring 13 is formed with a plurality of keys 13c that are radially cut out by partially cutting the outer ring 13 in the axial direction. The rear cover 7 side of the key 13c is radially inward of the key 13c. A protruding abutting portion 13d is formed. A key groove 10 i is formed at a position corresponding to the key 13 c of the outer ring 13 on the outer peripheral side of the convex portion 10 a of the connecting member 10. A plurality of grooves 13 b are formed on the inner periphery of the outer ring 13 and communicate with the water channel 12.

  The connecting member 10 is inserted into the outer ring 13 from the front cover 6 side, the key 13c of the outer ring 13 and the key groove 10i of the connecting member 10 are fitted, and the convex portion 10a abuts against the abutting portion 13d. ing. A C ring 15 is provided on the front cover side of the outer ring 13 and the convex portion 10a of the connecting member 10, and the C ring 15 restricts the convex portion 10a from moving in the axial direction with respect to the convex portion 5a.

  With the above configuration, the connecting member 10 and the housing 5 can be connected by one C ring 15, so that the assembly workability of the electric motor 1 is improved. Further, since the outer ring 13 and the connecting member 10 are fixed by the spline, there is a backlash in the axial direction, and transmission of the axial component of vibration transmitted from the stator 4 to the housing 5 can be suppressed.

[Modification 5]
Modification 5 is a modification of the second embodiment. In the electric motor 1 of Example 2, the rotor 3 was divided into three pieces. On the other hand, the electric motor 1 of the modification 5 differs from the electric motor 1 of the embodiment 2 in that the rotor 3 is divided into four pieces.

  The configuration of the electric motor 1 of Modification 5 is different from that of the electric motor 1 of Example 2 in that the first convex portion 5c and the second convex portion 5d of the housing 5, the first convex portion 10c and the second convex portion 10d of the connecting member 10 are used. Therefore, the description of the specific configuration will be omitted, and the excitation force acting on the stator 4 and the displacement of the connecting member 10 will be described below.

[Excitation force]
In the electric motor 1 of Modification 5, the rotor 3 is divided into four pieces: a first piece 3i, a second piece 3j, a third piece 3k, and a fourth piece 3m. Between the first piece 3i and the second piece 3j, the first connection surface 3n, between the second piece 3j and the third piece 3k, the second connection surface 3p, the third piece 3k and the fourth piece 3m, A third connection surface 3q is formed between the two. Each adjacent piece is fixed to the shaft 2 so that the phase of the electrical angle is shifted by π.

  Hereinafter, for description, the position of the stator 4 facing the first piece 3i of the rotor 3 is the first piece position 4i, and the position of the stator 4 facing the second piece 3j of the rotor 3 is the second piece position. 4j, the position of the stator 4 facing the third piece 3k of the rotor 3 is the third piece position 4k, the position of the stator 4 facing the fourth piece 3m of the rotor 3 is the fourth piece position 4m, and the rotor The position of the stator 4 facing the third first connection surface 3n is the first connection surface position 4n, the position of the stator 4 facing the second connection surface 3p of the rotor 3 is the second connection surface position 4p, and the rotor. The position of the stator 4 facing the third third connection surface 3q is defined as a third connection surface position 4q.

FIG. 20 is a schematic diagram illustrating the excitation force acting on the stator 4 of the electric motor 1 of the fifth modification. The arrow in the figure indicates the direction of the excitation force.
In the electric motor 1 of the modified example 5, the first piece position 4i and the second piece position 4j adjacent to the stator 4, the second piece position 4j and the third piece position 4k, the third piece position 4k and the fourth piece position 4m. Exciting force in the opposite direction acts on each.
Since the rotor 3 is divided into four pieces, that is, the first piece 3i, the second piece 3j, the third piece 3k, and the fourth piece 3m, the stator 4 has both ends of the stator 4 and the first piece by the excitation force. The center of the connection surface position 4n and the second connection surface position 4p, and the center of the second connection surface position 4p and the third connection surface position 4q are the antinodes, and the first connection surface position 4n, the second connection surface position 4p, 3 A vibration having a node at the connection surface position 4q is generated.

[Displacement of connecting member]
Since the stator 4 is shrink-fitted to the connecting member 10, the stator 4 and the connecting member 10 vibrate together. The first connection surface position 4n, the second connection surface position 4p, and the third connection surface position 4q of the stator 4 serve as vibration nodes of the stator 4. Positions of the first connection surface 3n, the second connection surface 3p, and the third connection surface 3q of the rotor 3 (near the vibration node of the stator 4 (first connection surface position 4n, second connection surface of the stator 4) The first convex portion 10m, the second convex portion 10n, and the third convex portion 10p are provided on the connecting member 10 at a position substantially coincident with the position 4p and the third connection surface position 4q) in the axial direction. The first projecting portion 10m, the second projecting portion 10n, and the third projecting portion 10p of the connecting member 10 can reduce the amount of displacement compared to other connecting member 10 portions. Hereinafter, the displacement of the connecting member 10, the first convex portion 10m, the second convex portion 10n, and the third convex portion 10p will be described.

FIG. 21 is a schematic diagram showing the connecting member 10 that is displaced by the stator 4 that is displaced by the excitation force, and shows the case where the position of the rotor 3 is in phase 0 (zero).
When the position of the rotor 3 is phase 0 (zero), as shown in FIG. 21, the displacement amount of the connecting member 10 is hardly displaced in the first convex portion 10m, the second convex portion 10n, and the third convex portion 10p. . Due to the displacement of the connecting member 10, the first convex portion 10m generates axial vibration due to the bending moment, the second convex portion 10n generates axial vibration due to the bending moment, and the third convex portion 10p Axial vibration caused by bending moment occurs.

The first convex portion 10m and the second convex portion 10n of the connecting member 10 generate axial vibrations in opposite directions, and the second convex portion 10n and the third convex portion 10p generate axial vibrations in opposite directions. Therefore, when the housing 5 and the connecting member 10 are fixed at two locations, the first convex portion 10m and the second convex portion 10n, or the second convex portion 10n and the third convex portion 10p, the axial vibration transmitted to the housing 5 Is canceled in the housing 5, and vibration of the housing 5 can be suppressed.
[Modification 6]
Modification 6 is a modification of the second embodiment.
In the electric motor 1 of Example 2, the rotor 3 was divided into three pieces. The electric motor 1 of Modification 6 is different from the electric motor 1 of Example 2 in that the rotor 3 is divided into five pieces.

  The configuration of the electric motor 1 of Modification 6 is different from that of the electric motor 1 of Example 2 in that the first convex portion 5c and the second convex portion 5d of the housing 5, the first convex portion 10c and the second convex portion 10d of the connecting member 10. Therefore, the description of the specific configuration will be omitted, and the excitation force acting on the stator 4 and the displacement of the connecting member 10 will be described below.

[Excitation force]
In the electric motor 1 of Modification 5, the rotor 3 is divided into five pieces: a first piece 3r, a second piece 3s, a third piece 3t, a fourth piece 3u, and a fifth piece 3v. Between the first piece 3r and the second piece 3s, the first connection surface 3w, and between the second piece 3s and the third piece 3t, the second connection surface 3x, the third piece 3t and the fourth piece 3u, A third connection surface 3y is formed between the third pieces, and a third connection surface 3z is formed between the fourth piece 3u and the fifth piece 3v. Each adjacent piece is fixed to the shaft 2 so that the phase of the electrical angle is shifted by π.

  Hereinafter, for description, the position of the stator 4 facing the first piece 3r of the rotor 3 is the first piece position 4r, and the position of the stator 4 facing the second piece 3s of the rotor 3 is the second piece position. 4s, the position of the stator 4 facing the third piece 3t of the rotor 3 is the third piece position 4t, the position of the stator 4 facing the fourth piece 3u of the rotor 3 is the fourth piece position 4u, and the rotor The position of the stator 4 facing the third piece 3v is the fourth piece position 4v, the position of the stator 4 facing the first connection surface 3w of the rotor 3 is the first connection surface position 4w, and the position of the rotor 3 The position of the stator 4 facing the second connection surface 3x is the second connection surface position 4x, the position of the stator 4 facing the third connection surface 3y of the rotor 3 is the third connection surface position 4y, and the position of the rotor 3 is The position of the stator 4 facing the fourth connection surface 3z is defined as a fourth connection surface position 4z.

FIG. 22 is a schematic diagram illustrating the excitation force acting on the stator 4 of the electric motor 1 of the sixth modification. The arrow in the figure indicates the direction of the excitation force.
In the electric motor 1 of the modified example 5, the first piece position 4r and the second piece position 4s of the stator 4 adjacent to each other, the second piece position 4s and the third piece position 4t, and the third piece position 4t and the fourth piece position 4u. In the fourth piece position 4u and the fifth piece position 4v, an exciting force in the opposite direction is applied.
Since the rotor 3 is divided into four pieces, that is, a first piece 3r, a second piece 3s, a third piece 3t, a fourth piece 3u, and a fifth piece 3v, both ends of the stator 4 are applied to the stator 4 by an excitation force. And the center of the first connection surface position 4w and the second connection surface position 4x, the second connection surface position 4x and the third connection surface position 4y, and the center of the third connection surface position 4y and the fourth connection surface position 4z. The vibration is generated with the first connection surface position 4w, the second connection surface position 4x, the third connection surface position 4y, and the fourth connection surface position 4z as nodes.

[Displacement of connecting member]
Since the stator 4 is shrink-fitted to the connecting member 10, the stator 4 and the connecting member 10 vibrate together. The first connection surface position 4w, the second connection surface position 4x, the third connection surface position 4y, and the fourth connection surface position 4z of the stator 4 are nodes of vibration of the stator 4. Positions of the first connecting surface 3w, the second connecting surface 3x, the third connecting surface 3y, and the fourth connecting surface 3z of the rotor 3 (positions of the first connecting surface of the stator 4) near the vibration nodes of the stator 4 4w, 2nd connection surface position 4x, 3rd connection surface position 4y, 4th connection surface position 4z) in the connection member 10 of the position which substantially corresponds in an axial direction, the 1st convex part 10q, the 2nd convex part 10r, 3rd A convex portion 10s and a fourth convex portion 10t are provided. The first projecting portion 10q, the second projecting portion 10r, the third projecting portion 10s, and the fourth projecting portion 10t of the connecting member 10 can reduce the amount of displacement compared to other connecting member 10 portions. Hereinafter, the displacement of the connecting member 10, the first convex portion 10q, the second convex portion 10r, the third convex portion 10s, and the fourth convex portion 10t will be described.

FIG. 23 is a schematic diagram showing the connecting member 10 that is displaced by the stator 4 that is displaced by the excitation force, and shows the case where the position of the rotor 3 is in phase 0 (zero).
When the position of the rotor 3 is in phase 0 (zero), as shown in FIG. 23, the displacement amount of the connecting member 10 is the first protrusion 10q, the second protrusion 10r, the third protrusion 10s, and the fourth protrusion. The portion 10t is hardly displaced. Further, due to the displacement of the connecting member 10, axial vibration due to the bending moment occurs in the first convex portion 10q, axial vibration due to the bending moment occurs in the second convex portion 10r, and the third convex portion 10q. An axial vibration due to the bending moment is generated in the portion 10s, and an axial vibration due to the bending moment is generated in the fourth convex portion 10t.

  The first convex portion 10q and the second convex portion 10r of the connecting member 10 generate axial vibrations in opposite directions, the second convex portion 10r and the third convex portion 10s generate axial vibrations in opposite directions, and the third The convex portion 10s and the fourth convex portion 10t generate axial vibrations in opposite directions. Therefore, the first convex portion 10q and the second convex portion 10r, the second convex portion 10r and the third convex portion 10s, or the third convex portion 10s and the fourth convex portion 10t, or the first convex portion 10q. When the housing 5 and the connecting member 10 are fixed at four locations of the second convex portion 10r, the third convex portion 10s, and the fourth convex portion 10t, the axial vibration transmitted to the housing 5 is canceled in the housing 5, The vibration of the housing 5 can be suppressed.

1 is a cross-sectional view of an electric motor of Example 1. FIG. FIG. 3 is a schematic diagram illustrating an excitation force that acts on the stator according to the first embodiment. 3 is a graph showing the magnitude of an excitation force acting on the stator of Example 1. FIG. 3 is a schematic diagram showing displacement of the stator of Example 1. 3 is a graph showing the amount of displacement of the stator of Example 1. It is sectional drawing of an electric motor when a stator is shrink-fitted directly to a housing. It is a schematic diagram which shows the displacement of a stator when a stator is shrink-fitted directly to a housing. FIG. 3 is a schematic diagram showing displacement of a connecting member of Example 1. FIG. 3 is a schematic diagram illustrating displacement of the housing according to the first embodiment. 6 is a cross-sectional view of an electric motor according to Embodiment 2. FIG. FIG. 6 is a schematic diagram showing an excitation force acting on the stator of Example 2. FIG. 6 is a schematic diagram showing displacement of a connecting member of Example 2. FIG. 6 is a schematic diagram illustrating displacement of a housing according to a second embodiment. 6 is a cross-sectional view of an electric motor according to Embodiment 3. FIG. FIG. 6 is a schematic diagram illustrating displacement of a housing according to a third embodiment. 6 is a cross-sectional view of an electric motor according to Modification 1. FIG. FIG. 10 is a cross-sectional view of an electric motor according to Modification 2. It is sectional drawing of the electric motor of the modification 3. It is sectional drawing of the electric motor of the modification 4. FIG. 10 is a schematic diagram showing an excitation force that acts on the stator of Modification 5. FIG. 10 is a schematic diagram illustrating displacement of a connecting member according to Modification 5. FIG. 10 is a schematic diagram showing an excitation force that acts on the stator of Modification 6. FIG. 10 is a schematic diagram illustrating displacement of a connecting member according to Modification 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric motor 2 Shaft 3 Rotor 4 Stator 5 Housing 6 Front cover 7 Rear cover 10 Connecting member

Claims (10)

A rotor having a magnet composed of two pieces with respect to the axial direction, the magnet having a connection surface between adjacent pieces, and a magnet arranged so that the phase of the electrical angle of the adjacent pieces is shifted by π;
A stator having a plurality of electromagnetic coils on a surface facing the rotor;
A housing that supports the stator;
In an electric motor with
An electric motor comprising a connecting member having a connecting position for connecting the housing and the stator between one end face and the other end face of the stator with respect to the axial direction. A rotor having a magnet composed of a plurality of pieces in the axial direction, wherein the magnet has a plurality of connection surfaces between adjacent pieces, and the magnets are arranged so that the phases of the electrical angles of the adjacent pieces are shifted by π. When,
A stator having a plurality of electromagnetic coils on a surface facing the rotor;
A housing that supports the stator;
In an electric motor with
A connection position between a connection surface position that coincides with the position of the connection surface in the axial direction and a connection surface center position that is the center of the adjacent connection surface position, and the adjacent connection surface center position, or A connecting member for connecting the housing and the stator at at least one position of the connecting position between the end face position coincident with the end face of the stator and the connecting face center position adjacent to the end face position. An electric motor characterized by providing a motor. The electric motor according to claim 1 or 2,
The electric motor according to claim 1, wherein the connecting member has the connecting position as the connecting surface position. The electric motor according to any one of claims 1 to 3,
The electric motor according to claim 1, wherein the connecting member includes a connecting member that connects the connecting position and an axial side surface of the housing. In the electric motor according to any one of claims 2 to 4,
The electric motor according to claim 1, wherein the connecting member connects the housing and the stator at an even number of adjacent connecting positions. The magnet has two pieces in the axial direction, and the magnet has one connecting surface between adjacent pieces, and the magnets are arranged so that the phase of the electrical angle of the adjacent pieces is 0, π. With the rotor
A stator having a plurality of electromagnetic coils on a surface facing the rotor;
A connecting member for connecting an electric motor having a housing to a housing,
A connecting member for connecting the housing and the stator at the connecting position is provided between the end face position that coincides with the end face of the stator in the axial direction and the adjacent end face position. A connecting member. A rotor having a magnet composed of a plurality of pieces in the axial direction, wherein the magnet has a plurality of connection surfaces between adjacent pieces, and the magnets are arranged so that the phases of the electrical angles of the adjacent pieces are shifted by π. When,
A stator having a plurality of electromagnetic coils on a surface facing the rotor;
A connecting member for connecting an electric motor having a housing to a housing,
A connection position between a connection surface position that coincides with the position of the connection surface in the axial direction and a connection surface center position that is the center of the adjacent connection surface position, and the adjacent connection surface center position, or The connection position is between an end surface position that coincides with the end surface of the stator and the connection surface center position adjacent to the end surface position, and the housing and the stator are connected at least at one of the connection positions. A connecting member. A connecting member for connecting an electric motor having a stator to a housing,
The connecting member connects the stator and the housing at a position excluding the maximum amplitude of vibration generated in the stator. A rotor having a magnet composed of two pieces in the axial direction, the magnet having one connecting surface between adjacent pieces, and a magnet arranged so that the phase of the electrical angle of the adjacent pieces is shifted by π And a motor having a plurality of electromagnetic coils on a surface facing the rotor, and a motor coupling method for coupling an electric motor to a housing via a coupling member,
A connection position is defined between an end face position that coincides with the end face of the stator with respect to the axial direction and the adjacent end face position, and the housing and the stator are connected at the connection position. Electric motor connection method. A rotor having a magnet composed of a plurality of pieces in the axial direction, wherein the magnet has a plurality of connection surfaces between adjacent pieces, and the magnets are arranged so that the phases of the electrical angles of the adjacent pieces are shifted by π. And a motor having a plurality of electromagnetic coils on a surface facing the rotor, and a motor coupling method for coupling an electric motor to a housing via a coupling member,
A connection position between a connection surface position that coincides with the position of the connection surface in the axial direction and a connection surface center position that is the center of the adjacent connection surface position, and the adjacent connection surface center position, or The connection position is between an end surface position that coincides with the end surface of the stator and the connection surface center position adjacent to the end surface position, and the housing and the stator are connected at least at one of the connection positions. An electric motor connecting method.

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