JP5072648B2 - Motor stator mounting structure - Google Patents

Description

  The present invention relates to a motor, and more particularly to a structure for attaching a stator to a motor housing.

As a claw pole type motor, three-phase stator rings of U, V, W are laminated in the axial direction, meandering annular coils are wound around a plurality of teeth protruding from the inner periphery of each stator ring, 2. Description of the Related Art A magnetic pole claw that is opposed to the outer peripheral surface of a rotor is extended at the tip of a tooth (see, for example, Patent Document 1).
In many of this type of motor, the stator (stator ring) is formed of an iron-based powder compact.
JP 2006-280188 A

  However, when a stator formed of an iron-based dust compact is attached to an aluminum motor housing, the axial end face of the stator is abutted against the motor housing and fastened with bolts, and the linear expansion of both molding materials Due to the difference in the coefficients, the thermal strain of the motor housing is input to the green compact (stator), which is disadvantageous in strength.

  Accordingly, the present invention provides a stator mounting portion structure for a motor that can reduce the load acting on the stator as much as possible due to the difference in linear expansion coefficient between the stator and the motor housing, thereby improving the durability of the stator. It is something to try.

The invention according to claim 1 which solves the above-mentioned problem is a stator (for example, mainly composed of a green compact having a linear expansion coefficient smaller than that of a motor housing (for example, a motor housing 11 in an embodiment described later)). In a stator mounting portion structure of a motor for mounting a stator 10) in an embodiment described later to the motor housing, a plate material (for example, a plate material 30 in an embodiment described later) coupled to one end portion in the axial direction of the stator. The plate member is extended in a radial direction from a base wall (for example, a base wall 32 in an embodiment described later) coupled to the stator via a bent portion (for example, a bent portion 34 in an embodiment described later). A fixed piece (for example, a fixed piece 35 in an embodiment described later) is provided, and the fixed piece is attached to the motor housing. Characterized in that attached to ring.
When thermal strain is generated in the motor housing, the thermal strain is input to a fixed piece of the plate material that is a coupling portion with the motor housing. When thermal strain is input to the fixed piece, the fixed piece is displaced relative to the base wall of the plate material coupled to the stator via the bent portion, and at this time, the thermal strain is absorbed. .

The invention according to claim 2 is a stator (for example, a stator in an embodiment described later) mainly composed of a powder molded body having a linear expansion coefficient smaller than that of a motor housing (for example, a motor housing 11 in the embodiment described later). In the stator mounting structure of the motor for mounting 10) to the motor housing, a plate material (for example, a plate material 130 in the embodiment described later) having a linear expansion coefficient substantially the same as that of the stator and higher in strength than the stator is provided. The plate material is sandwiched between one end face in the axial direction of the stator and the motor housing, and the stator and the plate material are fastened and fixed to the motor housing.
When thermal strain occurs in the motor housing, transmission of the thermal strain to the stator is prevented by a plate material having the same linear expansion coefficient as that of the stator and having high strength.

  According to the first aspect of the present invention, since the thermal strain of the motor housing can be absorbed by the bent portion between the fixed piece of the plate material and the base wall, the durability of the stator can be reliably improved. it can.

  According to the second aspect of the present invention, the transmission of the thermal strain of the motor housing to the stator can be prevented by the plate material having the same linear expansion coefficient as the stator and having a high strength. It can certainly be improved.

Embodiments of the present invention will be described below with reference to the drawings.
First, the first embodiment shown in FIGS. 1 to 6 will be described.
FIG. 1 is a front view of a motor 1 that employs a stator mounting portion structure according to the present invention, and FIG. 2 is an exploded perspective view of the motor 1.
For example, the motor 1 is directly connected between an engine and a transmission of a hybrid vehicle, and is used to transmit motor power to wheels via the transmission and to generate power using the power of the wheels and engine. . The stator 10 is attached to the inside of an aluminum motor housing 11 that is integrally coupled to the engine block, and a rotor 12 is coaxially disposed on the inner peripheral side thereof. A permanent magnet 20 (see FIGS. 4 and 5) is attached to the rotor 12 side, and the stator 10 generates a rotating magnetic field for rotating the rotor 12.

This motor 1 is a so-called claw pole type motor, and a stator 10 includes U-phase, V-phase, and W-phase three-phase stator rings 13U, 13V, and 13W, and U-phase and W-phase engaged therewith. Ring coil 21 (see FIGS. 4 and 5). In FIG. 2, the annular coil 21 is not shown. Each stator ring 13U, 13V, 13W is formed of an iron-based dusting magnetic material having a linear expansion coefficient smaller than that of the motor housing 11 (aluminum), and annular return path portions 15u, 15v, 15w forming outer peripheral walls. And a plurality of teeth 16u, 16v, and 16w that protrude radially inward from the inner periphery of the return path portions 15u, 15v, and 15w and engage with the annular coil 21. The stator rings 13U, 13V, and 13W are configured such that the return path portions 15u, 15v, and 15w are stacked in the axial direction, and in this state, the teeth 16u, 16v, and 16w are arranged in a predetermined order along the circumferential direction. It has become. In addition, the ends of the teeth 16u, 16v, and 16w on the radially inner side protrude outwardly slightly from the general cross section of the teeth 16u, 16v, and 16w, and magnetic flux enters and exits against the outer peripheral surface of the rotor 12. Magnetic pole claws 17u, 17v, 17w to be performed are provided.
A plurality of bulging portions 18 bulging outward in the radial direction of the return path portions 15u, 15v, 15w are provided at the outer peripheral edge portions of the respective stator rings 13U, 13V, 13W, and the respective stator rings 13U, 13V, Corresponding bulging portions 18 of 13 W are coupled to each other in the axial direction.

  On the other hand, as shown in FIG. 2, the motor housing 11 has a bottom wall 22 coupled to the engine block and a peripheral wall 23 surrounding the periphery of the stator 10, and is formed in a substantially bottomed cylindrical shape. ing. The bottom wall 22 is provided with a shaft hole 25 into which the rotary shaft 24 (see FIG. 1) of the rotor 12 is inserted at a substantially central portion, and a plurality of (four) support bosses 26. They are spaced apart in the direction. The support boss 26 rises from the bottom wall 22 together with the general portion of the peripheral wall 23, and the rising end surface 26 a is formed flat, and has a set height lower than the end surface of the general portion of the peripheral wall 23. Bolt fastening holes 27 are formed in the end surface 26 a of each support boss 26.

An annular plate member 30 is attached to one end surface (end surface of the stator ring 13 </ b> U) of the stator 10 disposed on the opening side of the peripheral wall 23 of the motor housing 11 with a plurality of bolts 31.
3 and 4 show a single plate material 30, and FIGS. 5 and 6 show a state where the plate material 30 is attached.
The plate material 30 is formed of an iron-based metal material having a linear expansion coefficient substantially equal to that of the dust magnetic material constituting the stator 10. However, the plate material 30 is formed on the basis of a rolled material or the like, and the mechanical strength is sufficiently higher than that of the stator 10.

The plate member 30 includes a substantially annular base wall 32 that is superposed on the return path portion 13U and the bulging portion 18 on the end face of the stator ring 10U, and positions corresponding to the bulging portions 18 of the base wall 32. An insertion hole 33 (stator fixing portion) is formed in the. Fixing pieces 35 are extended through bent portions 34 at a plurality of locations on the outer periphery of the base wall 32. The extending position of each fixing piece 35 is set at a substantially intermediate position between adjacent insertion holes 34 on the base wall 32. A gentle curve is provided at the outer peripheral edge of the base wall 32 of the plate member 30, and each bent part 34 is bent stepwise in the axial direction toward the bottom side of the motor housing 11 so as to be continuous with the curve. Yes. The fixed piece 35 is formed in a tapered trapezoidal shape or a triangular shape, and extends from the end of the bent portion 34 toward the radially outer side of the base wall 32, and a bolt insertion hole 36 is provided at substantially the center of the extended portion. Is formed. Bolts 37 are inserted into the respective bolt insertion holes 36, and the tip portions of the bolts 37 are fastened to the corresponding support bosses 26 of the motor housing 11. As shown in FIG. 4, the height h1 of the bent portion 34 of the plate member 30 is set to be higher than the height h2 of the head of the bolt 37 in the axial direction.
The stator 10 is fastened and fixed to a support boss 26 of the motor housing 11 via a plate material 30 attached to one end in the axial direction.

  As described above, in the stator attachment portion structure employed in the motor 1, the plate material 30 made of an iron-based metal material is attached to one end in the axial direction of the stator 10, and the bent portion 34 is attached to the base wall 32 of the plate material 30. Since the fixed piece 35 extended via the bolt is fastened to the support boss 26 of the motor housing 11 by a bolt, when the stator 10 and the motor housing 11 are thermally deformed by heat generated by the motor 1 or the engine, a molding material is used. When a relative thermal strain due to the difference in linear expansion coefficient between the iron-based material and aluminum occurs between the motor housing 11 and the stator 10, the motor housing is made against the base wall 32 of the plate member 30 integral with the stator 10. Each of the fixed pieces 35 of the plate member 30 integral with the plate 11 is displaced by the spring action of the bent portion 34.

Thereby, the thermal strain of the motor housing 11 is absorbed by the plate material 30 and is not easily transmitted to the stator 10 side. Therefore, when this stator mounting portion structure is employed, the thermal strain of the motor housing 11 hardly acts on the stator 10 from the dust magnetic material, so that the durability of the stator 10 can be improved.
By adopting this mounting structure, it is possible to reduce the influence of the thermal strain of the motor housing 11, so that the stator 10 can have a structure with more excellent magnetic characteristics without worrying about a decrease in strength. it can.

  Further, in the mounting portion structure of this embodiment, since the height h1 of the bent portion 34 of the plate material 30 is set higher than the axial height h2 of the head of the bolt 37, the stator 10 is mounted on the motor housing 11. The head of the bolt 37 does not jump out of the stator mounting surface in the state of being attached to the motor, which is effective for shortening the axial length of the motor housing portion.

In this embodiment, the plate member 30 is attached to one end of the stator 10 located on the opening side of the motor housing 11, and the stator 10 is fixed in the motor housing 11 by being suspended from the support boss 26. However, the plate member 30 may be attached to the other end of the stator 10 located on the bottom side of the motor housing 11 so that the stator 10 is fixed near the bottom of the motor housing 11.
However, it is advantageous to suppress the transmission of thermal strain from the motor housing 11 to the stator 10 when the stator 10 is attached to the opening side of the motor housing 11 via the plate member 30 as in the above embodiment.

Next, a second embodiment shown in FIGS. 7 and 8 will be described. In this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
FIG. 7 is an exploded perspective view of the motor 101 of this embodiment, and FIG. 8 is a cross-sectional view of the motor 101 cut along the circumference of the stator 10.
In the motor 101, the basic structure of the stator 10 is substantially the same as that of the first embodiment, but a substantially flat stator installation surface 40 is provided on the bottom wall 22 of the motor housing 11, and a plate is formed on the stator installation surface 40. The stator 10 is attached via a material 130.
Each bulging portion 18 on the outer peripheral side of the stator 10 is provided with a bolt insertion hole 41 penetrating in the axial direction, and a fixing bolt 42 is fastened at a position corresponding to the bolt insertion hole 41 on the stator installation surface 40. Bolt fastening holes 43 are provided.

  The plate material 130 is made of an iron-based metal material having a linear expansion coefficient and a heat transfer sequence rate substantially equal to those of the dust magnetic material constituting the stator 10, and has substantially the same shape as the end surface of the stator 10, that is, an annular shape. A plurality of bulging portions 45 are provided on the outer periphery of the base wall 44. Each bulging portion 45 is formed with a bolt insertion hole 46 into which the fixing bolt 42 is inserted.

  The stator 10 is disposed on the bottom wall 22 of the motor housing 11 so that the plate member 130 is sandwiched between the axial end surface and the stator installation surface 40, and a plurality of fixing bolts penetrating the stator 10 and the plate member 130. 42 is fastened and fixed to the motor housing 11.

In the stator mounting portion structure employed in the motor 101, a plate material 130 made of the same iron-based metal material as the stator 10 and having higher strength than the stator 10 is sandwiched between the stator installation surface 40 of the motor housing 11 and the stator 10. In this state, since the stator 10 is fastened and fixed to the motor housing 11 by the plurality of fixing bolts 42, the thermal strain of the motor housing 11 acting on the fixing bolt 42 is received by the plate material 130, and the fixing bolt 43 is fixed. It is possible to prevent the thermal strain from being transmitted to the stator 10.
That is, for example, in the case of FIG. 8, when a force acts on the two fixing bolts 42 adjacent to each other due to the thermal strain of the motor housing 11 so as to widen the widths of both ends, In this case, a force that narrows the head width of the both acts, but the fixing plate member 130 interposed between the stator 10 and the motor housing 11 receives the force acting on the fixing bolt 42 to receive the fixing force. Input of stress to the stator 10 through the bolt 42 can be reduced.
Therefore, the durability of the stator 10 can be improved even in a motor employing this stator mounting structure.

  Further, in the case of this stator mounting portion structure, since the heat transfer coefficient of the plate material 130 interposed between the stator 10 and the motor housing 11 is substantially the same as that of the stator 10, the stator 10 is superposed directly on the motor housing 11. The heat generated by the coils of the stator 10 can be quickly released to the motor housing 11 with good heat dissipation as in the case of fixing with the motor. Therefore, this makes it possible to constantly maintain the performance of the motor 101 stably.

  In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in the above embodiment, the entire stator is formed of a dust magnetic material, but the stator does not necessarily need to be entirely formed of a dust magnetic material, and a structure in which silicon steel plates are mixed in part. It may be.

The front view of the motor of 1st Embodiment of this invention. The exploded perspective view of the motor of the embodiment. The front view of the plate material used for the motor of the embodiment. Sectional drawing corresponding to CC cross section of FIG. 3 of the plate material of the embodiment. Sectional drawing corresponding to the AA cross section of FIG. 1 of the motor of the embodiment. Sectional drawing corresponding to the BB cross section of FIG. 1 of the motor of the embodiment. The exploded perspective view of the motor of a 2nd embodiment of this invention. The typical longitudinal section which cut the motor of the embodiment along the circumference.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Stator 11 ... Motor housing 30, 130 ... Plate material 32 ... Base wall 34 ... Bending part 35 ... Fixed piece

Claims (2)

In the stator attachment part structure of the motor for attaching the stator mainly composed of a compacted compact having a linear expansion coefficient smaller than that of the motor housing to the motor housing,
A plate member coupled to one end of the stator in the axial direction is provided, and a fixing piece extending radially from the base wall coupled to the stator via a bent portion is provided on the plate member, A stator mounting portion structure for a motor, wherein the fixed piece is coupled to the motor housing. In the stator attachment part structure of the motor for attaching the stator mainly composed of a compacted compact having a linear expansion coefficient smaller than that of the motor housing to the motor housing,
A plate material having substantially the same linear expansion coefficient as that of the stator and higher in strength than the stator is provided, and the plate material is sandwiched between one end face in the axial direction of the stator and the motor housing, and the stator and the plate material are A stator mounting structure for a motor, which is fastened and fixed to the motor housing.

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