JP2005237092A - Stator of claw-pole motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress magnetic flux leakage between the projections in respective phases of the stator of a claw-pole motor to increase the torque of the motor. <P>SOLUTION: The stator 19 of the claw pole-type motor is constructed as follows teeth 31b, 32b, and 33b in a plurality of phases are protruded from an annular return path 31a, 32a, and 33a, and the projections 31c, 32c, and 33c facing the peripheral surface of a rotor 17 are formed at their ends; windings 34, 35A, 35B, and 36 are housed in annular slots formed between the adjacent teeth 31b, 32b, and 33b. The circumferential size of air gaps g, between the adjacent projections 31c, 32c, and 33c, increases, as a going from the rotor 17 side toward the teeth 31b, 32b, and 33b. Thus, the areas of the end faces of the projections 31c, 32c, and 33c facing the rotor 17 can be ensured, and further the magnetic flux leakage between the adjacent projections 31c, 32c, and 33c can be minimized, and increase the torque of the motor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, a plurality of phases of teeth are protruded in the radial direction while being spaced apart from the peripheral surface of the annular return path in the axial direction, and a protrusion protruding in the axial direction at the tip of each tooth is formed to face the peripheral surface of the rotor The present invention also relates to a stator for a claw pole type motor in which a winding is housed in an annular slot formed between teeth adjacent in the axial direction.

  The stator of the claw pole type motor described in Patent Document 1 below includes three unit stators corresponding to each of the U phase, V phase, and W phase, and each unit stator is separated in the axial direction. The two teeth and a return path that connects these teeth at the radially outer ends are formed in a U-shaped cross section. And by energizing the annular winding housed inside the unit stator having a U-shaped cross section to form an independent magnetic path, the two teeth project at the radially inner ends so as to face the rotor Two types of protrusions having different polarities are magnetized.

  By the way, in the above conventional one, three unit stators of U phase, V phase and W phase are stacked in the axial direction to constitute a stator. Each unit stator has an annular shape in which a winding is housed. Since there are slots and two teeth and two types of protrusions, the axial thickness increases, and the axial dimension of the stator in which three unit stators are stacked increases. there were.

  Therefore, the present applicant arranges a plurality of teeth in the axial direction, accommodates the windings in an annular slot formed between adjacent teeth, and extends in the axial direction to the radially inner end of each tooth to extend the outer peripheral surface of the rotor. Japanese Patent Application No. 2003-158898 has already proposed a claw pole type motor provided with a protrusion opposite to the above.

In the claw pole type motor proposed in Japanese Patent Application No. 2003-158898, U-phase, V-phase, and W-phase protrusions are integrally formed on the radially inner side of the U-phase, V-phase, and W-phase teeth. This protrusion faces the permanent magnet provided on the outer peripheral surface of the rotor.
JP-A-7-227075

  By the way, what was proposed in the above-mentioned Japanese Patent Application No. 2003-158898 is that magnetic flux leakage occurs through the air gap formed between the protrusions of the U phase, V phase and W phase adjacent in the circumferential direction. There is a possibility that the torque of the motor is reduced due to the leakage of the magnetic flux.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to increase torque by suppressing leakage of magnetic flux between projections of each phase of a stator of a claw pole type motor.

  In order to achieve the above object, according to the invention described in claim 1, a plurality of phases of teeth are protruded radially from the circumferential surface of the annular return path so as to protrude in the radial direction. A stator of a claw pole motor in which a protrusion protruding in the axial direction is formed to face the circumferential surface of the rotor, and a winding is housed in an annular slot formed between adjacent teeth in the axial direction. A claw pole type motor stator is proposed in which the size of the air gap in the circumferential direction is increased from the rotor side toward the teeth side.

  According to the second aspect of the present invention, in addition to the configuration of the first aspect, the both sides of the circumferential projections of each phase are inclined with respect to the radial direction, whereby the size of the air gap is adjusted to the rotor. A stator of a claw pole type motor characterized by being increased from the side toward the tooth side is proposed.

  According to the invention described in claim 3, in addition to the configuration of claim 1, the size of the air gap can be set to the rotor by inclining one circumferential surface of each phase protrusion with respect to the radial direction. A stator of a claw pole type motor characterized by being increased from the side toward the tooth side is proposed.

  The U-phase, V-phase, and W-phase teeth 31b, 32b, and 33b of the embodiment correspond to the teeth of the present invention, and the U-phase, V-phase, and W-phase protrusions 31c, 32c, and 33c of the embodiment are protrusions of the present invention. The U-phase winding 34, the first and second V-phase windings 35A and 35B, and the W-phase winding 36 of the embodiment correspond to the winding of the present invention, and the first and second annular slots of the embodiment 37 and 38 correspond to the annular slot of the present invention.

  According to the configuration of claim 1, the size of the circumferential air gap formed between the protrusions protruding in the axial direction from the tips of the teeth of each phase extending in the radial direction and facing the circumferential surface of the rotor Leakage from different phases by reducing the area where protrusions adjacent to each other in the circumferential direction are reduced, while ensuring the area of the tip face of the protrusion facing the rotor. Can be minimized and the motor torque can be increased.

  According to the configuration of the second aspect, since both circumferential surfaces of the projections of each phase are inclined with respect to the radial direction, the size of the air gap between the projections adjacent in the circumferential direction is changed from the rotor side to the teeth side. Can be increased towards.

  According to the configuration of the third aspect, since the circumferential one side surface of each phase projection is inclined with respect to the radial direction, the size of the air gap between the projections adjacent in the circumferential direction is changed from the rotor side to the teeth side. Can be increased towards.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.

  1 to 9 show a first embodiment of the present invention. FIG. 1 is a view showing a power unit of a hybrid vehicle equipped with a claw pole type motor. FIG. 2 is an enlarged sectional view taken along line 2-2 in FIG. 3 is a sectional view taken along line 3-3 in FIG. 2, FIG. 4 is a sectional view taken along line 4-4 in FIG. 2, FIG. 5 is a sectional view taken along line 5-5 in FIG. 7 is a partially broken perspective view of the stator, FIG. 8 is an exploded perspective view of the stator, and FIG. 9 is a graph for explaining the influence of the leakage magnetic flux between adjacent protrusions on the torque of the motor.

  As shown in FIG. 1, the power unit of the hybrid vehicle includes a claw pole type motor M disposed between an engine E and a transmission T. A motor case 13, a torque converter case 14, and a transmission case 15 are coupled to the right side surfaces of the cylinder block 11 and the crankcase 12 of the engine E, and the shaft end of the crankshaft 16 supported between the cylinder block 11 and the crankcase 12. The rotor 17 of the motor M is fixed to the motor. An annular stator 19 is opposed to a plurality of permanent magnets 18 fixed to the outer periphery of the rotor 17 via a predetermined air gap, and the stator holder 20 that supports the stator 19 is connected to the cylinder block 11, the crankcase 12, and the motor case. 13 is fixed by being sandwiched between the split surfaces.

  The torque converter 21 housed in the torque converter case 14 includes a turbine runner 22 and a pump impeller 23, and a side cover 24 that is coupled to the turbine runner 22 and covers the pump impeller 23 is connected to the motor M via the drive plate 25. Connected to the rotor 17. The pump impeller 23 of the torque converter 14 is coupled to the left end of the main shaft 26 supported by the transmission case 15.

  Next, the structure of the stator 19 of the motor M that operates with three-phase alternating current will be described with reference to FIGS.

  As can be seen from FIG. 8, the stator 19 includes a U-phase stator ring 31, a V-phase stator ring 32, a W-phase stator ring 33, a single U-phase winding 34, and two pieces integrally formed of a dust material. The first and second V-phase windings 35A and 35B and one W-phase winding 36 are provided. The U-phase stator ring 31, the V-phase stator ring 32, and the W-phase stator ring 33 are overlapped in the axis L direction.

  As is apparent from FIGS. 2, 3, 7 and 8, the U-phase stator ring 31 has a return path 31a formed in an annular shape and a radially inward position from the circumferentially equidistant position of the return path 31a. The nine U-phase teeth 31b, which extend, and the nine U-phase protrusions 31c, which extend further inward in the radial direction from the radial inner ends of the U-phase teeth 31b are provided. The inner end in the radial direction of each U-phase protrusion 31c is bent in an L shape and extends to one side in the axis L direction while the radial height decreases from the base end toward the distal end. . The U-phase teeth 31b are portions corresponding to the radial heights of the windings 34, 35A, 35B, and 36, and a portion on the radially inner side is a U-phase protrusion 31c.

  As apparent from FIGS. 2, 4, 7 and 8, the V-phase stator ring 32 has a return path 32a formed in an annular shape and a radially inward position from the circumferentially equidistant position of the return path 32a. The nine V-phase teeth 32b... That extend and the nine V-phase protrusions 32c that extend further radially inward from the radially inner ends of these V-phase teeth 32b. The inner ends in the radial direction of the V-phase protrusions 32c are bent in a T shape and extend in both directions in the axis L direction while the radial height decreases from the base end side toward the distal end side. . The V-phase teeth 32b are portions corresponding to the radial heights of the windings 34, 35A, 35B, and 36, and a portion on the inner side in the radial direction is a V-phase protrusion 32c.

  As is apparent from FIGS. 2, 5, 7, and 8, the W-phase stator ring 33 is a mirror-symmetric member with respect to the U-phase stator ring 31 with respect to the V-phase stator ring 32, and the U-phase stator ring is turned upside down. It has the same shape that is compatible with 31. The reference numerals of the respective parts of the W-phase stator ring 33 are obtained by changing “31” of the reference numerals of the respective parts of the U-phase stator ring 31 to “33”.

  The motor M of the present embodiment operates with a three-phase alternating current, and the U-phase, V-phase, and W-phase protrusions 31c, ..., 32c, ..., 33c ... are 360 ° / 3 = 120 ° in electrical direction in the circumferential direction. They are placed out of position. On the other hand, each permanent magnet 18 of the rotor 17 is shared by the U-phase, V-phase, and W-phase protrusions 31c,..., 32c,. .., 32c,... 33c can generate a uniform torque in the rotor 17.

  As is apparent from FIG. 7, the axes of nine U-phase protrusions 31c, nine V-phase protrusions 32c, and nine W-phase protrusions 33c, which are sequentially arranged along the inner peripheral surface of the stator 19. The width in the L direction is substantially equal to the width in the direction of the axis L of the permanent magnets 18 of the rotor 17, and the linkage torque between the stator 19 and the rotor 17 is maximized to increase the output torque of the rotor 17. Can be made. Moreover, since each permanent magnet 18 is shared by the U-phase, V-phase, and W-phase protrusions 31c,..., 33c,..., The permanent magnets correspond to the projections 31c,. 18 can be eliminated in the direction of the axis L, and the number of permanent magnets 18 can be reduced.

  As apparent from FIGS. 3 to 7, a first annular slot 37 is formed between the U-phase teeth 31 b of the U-phase stator ring 31 and the V-phase teeth 32 b of the V-phase stator ring 32. A U-phase winding 34 and a first V-phase winding 35 </ b> A wound in advance in the first annular slot 37 are accommodated. A second annular slot 38 is formed between the W-phase teeth 33b of the W-phase stator ring 33 and the V-phase teeth 32b of the V-phase stator ring 32, and is wound around the second annular slot 38 in advance. The W-phase winding 36 and the second V-phase winding 35B are housed.

  That is, in the three-phase motor M of the embodiment, the number of the annular slots 37 and 38 is two obtained by subtracting 1 from the number of phases 3, and one first annular slot 37 has a first phase (U phase). And the second phase (V phase) windings 34 and 35A are accommodated, and the second annular slot 38 accommodates the second phase (V phase) and third phase (W phase) windings 35B and 36. Will be. Each of the windings 34, 35 </ b> A, 35 </ b> B, 36 has a rectangular wire with a rectangular cross section as a conducting wire, and is wound, for example, in four layers in the radial direction and wound in four layers in the axis L direction.

  In the U-phase winding 34 and the first V-phase winding 35A housed in the first annular slot 37, the U-phase winding 34 is disposed on the radially outer side, and the first V-phase winding 35A is disposed on the radially inner side. . The W-phase winding 36 and the second V-phase winding 35B housed in the second annular slot 38 have the W-phase winding 36 arranged radially outside and the second V-phase winding 35B arranged radially inside. The

  The three-phase alternating current is supplied to the U-phase winding 34, the first and second V-phase windings 35 </ b> A and 35 </ b> B, and the W-phase winding 36 that are star-connected, so that they are sequentially arranged on the inner peripheral surface of the stator 19. A rotating magnetic field is formed on the U-phase protrusion 31c, V-phase protrusion 32c, and W-phase protrusion 33c, and the rotor 17 can be rotationally driven by electromagnetic force generated between the permanent magnet 18 and the like.

  In this way, the U-phase teeth 31b of the U-phase stator ring 31 and the V-phase teeth 32b of the V-phase stator ring 32 are fixed by sandwiching the U-phase winding 34 and the first V-phase winding 35A, and the W-phase Since the W-phase teeth 33b of the stator ring 33 and the V-phase teeth 32b of the V-phase stator ring 32 are fixed by sandwiching the W-phase winding 36 and the second V-phase winding 35B, the windings 34, 35A, 35B, A special fixing member for fixing 36 is not necessary. Moreover, since the windings 34, 35A, 35B, 36 are housed in the first and second annular slots 37, 38 and do not interfere with the external parts, it is easy to manage the dimensions of the external parts.

  As is apparent from FIGS. 6 to 8, the circumferential width u of the U-phase teeth 31 b... And the U-phase protrusions 31 c extending radially inward from the return path 31 a of the U-phase stator ring 31 is given to the rotor 17. It decreases from the radially inner side facing toward the radially outer side continuous with the return path 31a. Similarly, the circumferential width v of the V-phase teeth 32b... And the V-phase protrusions 32c. The circumferential width w of the W-phase teeth 33b... And the W-phase protrusions 33c..., Which decreases toward the radially outer side connected to 32a and extends radially inward from the return path 33a of the W-phase stator ring 33, Decreases from the radially inner side facing to the radially outer side connected to the return path 33a. In other words, the circumferential widths u, v, w of the U-phase, V-phase, and W-phase protrusions 31 c, 32 c, 33 c, and so on are maximum values umax, vmax, wmax at the radially inner end facing the rotor 17. Become.

  The L-shaped U-phase protrusion 31c, the T-shaped V-phase protrusion 32c, and the L-shaped W-phase protrusion 33c face each other so as to partially overlap each other when viewed in the circumferential direction (FIG. 3). 5 and FIG. 7), and an air gap g is formed between the projections 31c..., 32c. The size g of the air gap g is the minimum value gmin at the radially inner ends of the U-phase, V-phase, and W-phase protrusions 31c..., 32c. It is increasing radially outward, that is, toward the U-phase, V-phase, and W-phase teeth 31b, 32b, 33b. The U-phase, V-phase and W-phase protrusions 31c,..., 33c,..., 33c. , 33c... Can be increased to increase the torque of the motor M (see FIG. 9).

  In this embodiment, U-phase, V-phase, and W-phase teeth 31b, 32b, 33b, ..., which are connected to the U-phase, V-phase, and W-phase projections 31c, 32c, ..., 33c ... are also directed radially outward. The U-phase, V-phase, and W-phase teeth 31b, ..., 32b, ..., 33b ... are arranged out of phase in the circumferential direction and do not face each other. Magnetic flux leakage does not occur in the portion, and therefore it is not always necessary to taper.

  Next, a second embodiment of the present invention will be described with reference to FIG.

  In the first embodiment shown in FIG. 6, the circumferences of the U-phase, V-phase and W-phase teeth 31 b, 32 b, 33 b, and U-phase, V-phase and W-phase protrusions 31 c, 32 c, 33 c. Although the directional both sides are inclined with respect to the radial direction, the air gap g between the protrusions 31c..., 32c.

  The second embodiment shown in FIG. 10 includes the circumferences of the U-phase, V-phase and W-phase teeth 31b..., 33b... And the U-phase, V-phase and W-phase protrusions 31c. Only one side surface in the direction is inclined with respect to the radial direction, and the other side surface in the circumferential direction is parallel to the radial direction. According to the second embodiment, the same effect as that of the first embodiment can be achieved.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, in the embodiment, the claw pole type motor M is used as a traveling motor of the hybrid vehicle, but the application is arbitrary.

  The motor M of the embodiment is an inner rotor type in which the rotor 17 is disposed inside the stator 19, but the present invention can also be applied to an outer rotor type motor in which the rotor is disposed outside the stator.

  In the embodiment, the U-phase winding 34 and the first V-phase winding 35A are disposed adjacent to each other in the radial direction in the first annular slot 37. However, they may be disposed adjacent to each other in the direction of the axis L. Similarly, in the embodiment, the W-phase winding 36 and the second V-phase winding 35B are disposed adjacent to each other in the radial direction in the second annular slot 38, but they may be disposed adjacent to each other in the direction of the axis L. good.

  In the embodiment, the three-phase motor M is illustrated, but the present invention can also be applied to a four-phase or more motor M.

  In the embodiment, the stator rings 31, 32, 33 of each phase are integrally formed, but return paths 31a, 32a, 33a, teeth 31b, 32b, 33b, and projections 31c, 32c are formed as necessary. .., 33c... Can be divided to increase their design freedom.

The figure which shows the power unit of the hybrid vehicle provided with the claw pole type motor 2-2 line enlarged sectional view of FIG. 3-3 sectional view of FIG. Sectional view along line 4-4 in FIG. Sectional view along line 5-5 in FIG. Sectional view along line 6-6 in FIG. Partially broken perspective view of stator Disassembled perspective view of stator Graph explaining the influence of the leakage torque between adjacent protrusions on the motor torque The figure corresponding to the said FIG. 6 based on 2nd Example of this invention.

Explanation of symbols

31a Return path 31b U phase teeth (teeth)
31c U-phase protrusion (protrusion)
32a Return path 32b V-phase teeth (teeth)
32c V-phase protrusion (protrusion)
33a Return path 33b W-phase teeth (teeth)
33c U-phase protrusion (protrusion)
34 U-phase winding (winding)
35A 1st V phase winding (winding)
35B 2nd V-phase winding (winding)
36 W phase winding (winding)
37 First annular slot (annular slot)
38 Second annular slot (annular slot)
L Axis g Air gap

Claims (3)

A plurality of phases of teeth are protruded in the radial direction apart from the circumferential surface of the annular return path, and a projection that protrudes in the axial direction and faces the circumferential surface of the rotor is formed at the tip of each tooth. A stator of a claw pole type motor having a winding housed in an annular slot formed between adjacent teeth,
A claw pole motor stator, wherein the size of a circumferential air gap between adjacent protrusions is increased from a rotor side toward a teeth side.   The size of the air gap is increased from the rotor side toward the teeth side by inclining both circumferential surfaces of the protrusions of each phase with respect to the radial direction. Claw pole type motor stator. The size of the air gap is increased from the rotor side toward the teeth side by inclining one circumferential surface of each phase protrusion with respect to the radial direction. Claw pole type motor stator.

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