JP2005218286A - Stator of claw pole type motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the deterioration of effective torque caused by a difference of the number of turns of windings of respective phases of a three-phase claw motor type motor to the minimum limit. <P>SOLUTION: When a U phase winding 34 and a first V phase winding 35A are accommodated into a first annular slot 37 and a second V phase winding 35B and a W phase winding 36 are accommodated in a second annular slot 38, inductances of the U phase winding 34 and the W phase winding 36 become smaller than inductances of the second V phase windings 35A, 35B. But, the difference of the inductances of the U phase winding 34, the first, second V phase windings 35A, 35B and the W phase winding 36 is decreased by arranging the U phase winding 34 and the W phase winding 36 outside radial directions which are back portions of the two annular slots 37, 38 and performing many linkages to leakage fluxes. Currents of the respective phases can be equalized and the deterioration of the effective torque of the three-phase claw pole type motor can be suppressed to the minimum limit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, the U-phase teeth, the V-phase teeth, and the W-phase teeth are protruded in the radial direction so as to be spaced apart from the circumferential surface of the annular return path in the axial direction, and are formed between the U-phase teeth and the V-phase teeth. A claw pole in which the U-phase winding and the first V-phase winding are accommodated in the annular slot, and the second V-phase winding and the W-phase winding are accommodated in the second annular slot formed between the V-phase teeth and the W-phase teeth. The present invention relates to a stator of a mold motor.

  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.

As shown in FIG. 8 (A), the claw pole type motor proposed in Japanese Patent Application No. 2003-158898 includes first, first, and second teeth formed between U-phase, V-phase, and W-phase teeth adjacent in the axial direction. The second annular slots 37 and 38 are provided, and the U-phase winding 34 and the first V-phase winding 35A are accommodated in the first annular slot 37 adjacent to each other in the axial direction, and the second V-phase winding is accommodated in the second annular slot 38. The wire 35B and the W-phase winding 36 are accommodated adjacent to each other in the axial direction.
JP-A-7-227075

  By the way, what was proposed in the above Japanese Patent Application No. 2003-158898 is because the total number of turns of the first and second V-phase windings is larger than the number of turns of the U-phase winding and the number of turns of the W-phase winding. As described in detail later in the embodiments of the present invention, there is a problem that the V-phase current becomes smaller than the U-phase current and the W-phase current, and the effective torque of the motor is reduced.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to minimize a decrease in effective torque due to a difference in the number of turns of windings in each phase of a three-phase claw pole type motor.

  To achieve the above object, according to the first aspect of the present invention, the U-phase teeth, the V-phase teeth, and the W-phase teeth protrude radially from the circumferential surface of the annular return path. The U-phase winding and the first V-phase winding are accommodated in the first annular slot formed between the U-phase teeth and the V-phase teeth, and the second annular slot formed between the V-phase teeth and the W-phase teeth. A stator of a claw pole type motor that houses a second V-phase winding and a W-phase winding, wherein a U-phase winding and a first V-phase winding are disposed on the back side and the entrance side of the first annular slot, respectively. A claw pole motor stator is proposed in which a W-phase winding and a second V-phase winding are arranged on the back side and the entrance side of the second annular slot, respectively.

  According to the invention described in claim 2, in addition to the configuration of claim 1, at least a part of the inner surface of the first annular slot and the second annular slot is provided with a convex portion or a concave portion that changes the slot width. It is formed.

  According to the configuration of the first aspect, the U-phase winding and the first V-phase winding are housed in the first annular slot formed between the U-phase teeth and the V-phase teeth, and formed between the V-phase teeth and the W-phase teeth. When the second V-phase winding and the W-phase winding are housed in the second annular slot formed, the inductances of the U-phase winding and the W-phase winding having a smaller number of turns than the first and second V-phase windings are the first. However, the U-phase winding and the W-phase winding are arranged on the inner side of the first and second annular slots and the leakage flux of the first and second annular slots is smaller than the inductance of the second V-phase winding. The first and second V-phase windings are arranged on the inlet side of the first and second annular slots so that the leakage flux of the first and second annular slots is less interlinked, so that the U-phase winding Reduced inductance difference between wire, first and second V-phase winding and W-phase winding , It is possible to minimize the reduction in the effective torque of each phase of the current three-phase claw pole type motor and equalized.

  According to the second aspect of the present invention, since the convex portion or the concave portion is formed on at least a part of the inner surfaces of the first annular slot and the second annular slot and the slot width is changed, the leakage in the first and second annular slots is caused. The amount of magnetic flux can be adjusted by the number, height, depth, etc. of the protrusions or recesses, and the U-phase current, V-phase current, and W-phase current can be made more accurate and uniform.

  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 13 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 an exploded perspective view of the stator, FIG. 8 is a diagram showing a magnetic flux equivalent circuit of the claw pole type motor, and FIG. 9 is a waveform of phase current when the number of turns of the U-phase, V-phase, and W-phase windings is equal. FIG. 10 is a diagram showing a waveform of phase current when the number of turns of the V-phase winding is larger than the number of turns of the U-phase and W-phase windings, and FIG. 11 is a diagram showing each phase in the first and second annular slots. FIG. 12 is a graph showing a phase current waveform of a conventional claw-pole motor, and FIG. 13 is a claw Is a graph showing the waveform of the phase current type 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 is apparent from FIG. 7, 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, which are 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, 6 and 7, the U-phase stator ring 31 has an annular return path 31a and a radially inward position from the circumferentially equidistant position of the return path 31a. The nine U-phase teeth 31b... That extend, and the nine protrusions 31c that extend further radially inward from the radial inner ends of the U-phase teeth 31b. The radially inner end of each 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 proximal 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 the radially inner portion thereof is a protrusion 31c.

  As apparent from FIGS. 2, 4, 6 and 7, 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 protrusions 32c that extend further radially inward from the radially inner ends of these V-phase teeth 32b. The radially inner ends of the respective protrusions 32c are bent in a T shape and extend to both sides in the axis L direction while the radial height decreases in a tapered shape from the proximal 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 the radially inner portion thereof is a protrusion 32c.

  As is apparent from FIGS. 2, 5, 6, and 7, 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. 6, nine U-phase projections 31c, nine V-phase projections 32c, and nine W-phase projections 33c arranged in order along the inner peripheral surface of the stator 19. The width in the direction of the axis L is substantially equal to the width of the permanent magnets 18 in the rotor 17 in the direction of the axis L, and the linkage flux between the stator 19 and the rotor 17 is increased to the maximum to increase the output of the rotor 17. Torque can be increased. 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 6, first annular slots 37 are 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 the stator 19 is sequentially arranged on the inner peripheral surface. A rotating magnetic field is formed on the U-phase protrusion 31c, the V-phase protrusion 32c, and the 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.

  By the way, the three-phase claw-pole motor M having the above-described configuration has one U-phase winding 34 and one W-phase winding 36, whereas the first and second V-phase windings 35A and 35B have one. Since the two are provided, the inductance of each phase is not equal, the current of each phase is shifted and the current value does not match, and this causes a problem that the efficiency is lowered. The reason will be described below.

FIG. 8A shows an equivalent circuit of leakage flux of a conventional three-phase claw pole type motor M. FIG. When a current is passed between the U-phase winding 34 and the W-phase winding 36, the magnetomotive force of each phase is V and the magnetoresistance between the phases is R, as shown in FIG.
φa = φb = 3V / 2R
Is established, and the flux linkage is 3 V / R.

When a current is passed between the U-phase winding 34 and the first and second V-phase windings 35A and 35B, as shown in FIG.
(Φa-φc) R = 2V
(Φb + φc) R = V
− (Φa−φc) R + (φb + φc) R + φcR = 0
From the relationship
φa = 3V / R, φb = 0, φc = V / R
Is established, and the flux linkage is 6 V / R.

  As described above, in the case where a current is passed between the U-phase winding 34 and the W-phase winding 36 having the same number of turns, the U-phase winding 34 and the number of turns are two times that of the U-phase winding 36. When a current is passed between the second V-phase windings 35A and 35B, or a current flows between the W-phase winding 36 and the first and second V-phase windings 35A and 35B whose number of turns is twice that of the W-phase winding 36. It can be seen that the flux linkage is doubled when.

  FIG. 9 shows a three-phase alternating current waveform when the U-phase current, the V-phase current and the W-phase current are equal and the phase differences are aligned at 120 °. On the other hand, in FIG. 10, the V-phase current decreases, the U-phase current advances, and the W-phase current retards due to the inductance mismatch of each phase described in FIG. The state where the waveform became non-uniform | heterogenous is shown. As a result, there arises a problem that the effective torque of the motor M is lower in FIG. 10 than in FIG.

  In this embodiment, this problem is addressed by the arrangement of the U-phase winding 34 and the first V-phase winding 35A in the first annular slot 37, and the W-phase winding 36 and the second V-phase winding in the second annular slot 38. This is solved by the arrangement of the line 35B. That is, as shown in FIGS. 4 to 6 and FIG. 11, in this embodiment, the U-phase winding 34 is arranged on the back side of the first annular slot 37 (that is, the side close to the return paths 31a, 32a, 33a). In addition, the first V-phase winding 35A is arranged on the inlet side (that is, the side far from the return paths 31a, 32a, and 33a) and the back side of the second annular slot 38 (that is, the side that is close to the return paths 31a, 32a, and 33a). The W-phase winding 36 is disposed at the same time, and the second V-phase winding 35B is disposed on the inlet side (that is, the side far from the return paths 31a, 32a, 33a).

  The U-phase winding 34 and the W-phase winding 36 disposed on the back side of the first and second annular slots 37, 38 increase the amount of leakage flux linkage and increase the inductance, while the first and second annular slots The first and second V-phase windings 35A and 35B arranged on the inlet side of the slots 37 and 38 have a reduced amount of interlinkage of leakage magnetic flux and an inductance, so that the U-phase winding 34, the first and second V-phase windings are reduced. It is possible to prevent the decrease in effective torque by offsetting the above-described non-uniform inductance of windings 35A, 35B and W-phase winding 36.

  The graph of FIG. 12 shows that the U-phase winding 34 and the first V-phase winding 35A are arranged adjacent to each other in the direction of the axis L in the first annular slot 37, and the W-phase winding 36 and This shows a three-phase alternating current waveform when the second V-phase winding 35B is arranged adjacent to the axis L direction (see FIG. 8A). The V-phase current is larger than the U-phase current and the W-phase current. It turns out that it has decreased. On the other hand, the graph of FIG. 13 shows a waveform of a three-phase alternating current when the U-phase winding 34, the first and second V-phase windings 35A and 35B, and the W-phase winding 36 are arranged according to this embodiment. Thus, it can be seen that the U-phase current, the V-phase current, and the W-phase current are uniform.

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

  As is apparent from a comparison between FIG. 11 and FIG. 14 showing the first embodiment, the slot widths of the first and second annular slots 37 and 38 of the first embodiment are constant in the radial direction. The slot widths of the first and second annular slots 37, 38 in the example vary at least partially. That is, in the example of FIG. 14A, convex portions 37a and 37a between the U-phase winding 34 and the W-phase winding 36 on the back side and the first and second V-phase windings 35A and 35B on the entrance side; 38a and 38a are formed and the slot width is partially reduced to increase the leakage magnetic flux of the first and second annular slots 37 and 38. In the example of FIG. Recesses 37b and 37b; 38b and 38b are formed between the wire 34 and the W-phase winding 36 and the first and second V-phase windings 35A and 35B on the entrance side, and the slot width is partially increased. Thus, the leakage magnetic flux of the first and second annular slots 37 and 38 is reduced.

  As described above, the slot width of the first and second annular slots 37, 38 is changed by changing the number, height, depth, etc. of the convex portions 37a, 37a; 38a, 38a and the concave portions 37b, 37b; 38b, 38b. By adjusting the magnitude of the magnetic flux, the U-phase current, the V-phase current, and the W-phase current can be made uniform with higher accuracy.

  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 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. Partially broken perspective view of stator Disassembled perspective view of stator Diagram showing magnetic flux equivalent circuit of claw pole type motor The figure which shows the waveform of a phase current in case the number of turns of U phase, V phase, and W phase winding is equal The figure which shows the waveform of a phase electric current when the number of turns of a V phase winding is larger than the number of turns of a U phase and a W phase winding Schematic showing the arrangement of windings for each phase in the first and second annular slots Graph showing the phase current waveform of a conventional claw pole motor The graph which shows the waveform of the phase current of the claw pole type motor of an Example The schematic diagram which shows the cross-sectional shape of the 1st, 2nd annular slot which concerns on 2nd Example.

Explanation of symbols

31a Return path 31b U-phase teeth 32a Return path 32b V-phase teeth 33a Return path 33b W-phase teeth 34 U-phase winding 35A First V-phase winding 35B Second V-phase winding 36 W-phase winding 37 First annular slot 37a Convex Portion 37b recess 38 second annular slot 38a protrusion 38b recess L axis

Claims (2)

The U-phase teeth, the V-phase teeth and the W-phase teeth protrude radially from the circumferential surface of the annular return path, and the U-phase teeth formed between the U-phase teeth and the V-phase teeth A stator for a claw pole motor that houses a phase winding and a first V-phase winding, and that houses a second V-phase winding and a W-phase winding in a second annular slot formed between the V-phase teeth and the W-phase teeth. Because
The U-phase winding and the first V-phase winding are arranged on the back side and the entrance side of the first annular slot, respectively, and the W-phase winding and the second V-phase winding are arranged on the back side and the entrance side of the second annular slot, respectively. A stator of a claw pole type motor characterized by that. 2. The claw pole motor stator according to claim 1, wherein a convex portion or a concave portion that changes a slot width is formed on at least a part of inner surfaces of the first annular slot and the second annular slot.

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