CN100555799C - Permanent magnet buried type electric rotating machine, air conditioner for vehicles motor and sealed electrical compressor - Google Patents

Abstract

With a plurality of parts of the corresponding respectively rotor periphery of the pole center of a plurality of permanent magnets part in a plurality of circumferential sections are set.Each circumferential section is the part with the concentric imaginary circle side face of the pivot axis of rotor.A plurality of circumferential sections are separated from each other in a circumferential direction.Each of a plurality of convex parts connects each adjacent a pair of aforementioned circumferential section.Each convex partly is positioned at than aforementioned imaginary circle side face and radially protrudes towards radial outside in the inner part the time.Each convex partly has a plurality of bights of protruding towards radial outside.Thereby, a kind of decline that suppresses the mean value of output torque is provided, simultaneously, at the electric rotating machine that does not utilize the structure of reluctance torque aspect the raising of the mean value of output torque.

Description

Permanent magnet buried type electric rotating machine, air conditioner for vehicles motor and sealed electrical compressor

Technical field

The present invention relates to a kind of permanent magnet buried type electric rotating machine, its inboard rotor rotated inside at the stator that is placed with coil is buried a plurality of permanent magnets as magnetic pole underground.The invention further relates to the air conditioner for vehicles motor and the sealed electrical compressor of this electric rotating machine of equipment.

Background technology

In the internal rotor of this electric rotating machine, on the circumferencial direction of rotor, be adjacent to bury underground a plurality of permanent magnets.Adjacent pair of permanent magnets magnetic pole is set on the circumferencial direction of rotor to different configurations mutually.Owing to magnetic flux density change rapidly takes place in the position (magnetic pole switching part) between adjacent pair of permanent magnets, thereby produces torque ripple, so electric rotating machine produces vibration and noise.

In the motor of TOHKEMY 2001-69701 communique, in order to suppress torque ripple, position (magnetic pole switching part) minimum between the adjacent in a circumferential direction pair of permanent magnets of rotor radius.Further, for core (pole center part) maximum of rotor radius at each permanent magnet, the peripheral shape of rotor is a sine wave shape.

In the motor of TOHKEMY 2002-95194 communique, for the position between the adjacent in a circumferential direction pair of permanent magnets of rotor radius (magnetic pole switching part) minimum, and maximum in the pole center part, the part corresponding with the pole center part is the circular shape that outwards protrudes in the periphery of rotor.

In the motor of TOHKEMY 2002-136011 communique, the part corresponding with pole center part is shaped as the circumferential part concentric with the pivot axis of rotor in the periphery of rotor.And in the periphery of rotor, the part that corresponds to each other with the adjacent pole end of 2 permanent magnets is the ditch shape.

In the motor of TOHKEMY 2004-260972 communique, main pole part and auxiliary magnetic pole part are arranged alternately in a circumferential direction.The periphery of rotor is distinguished by the 1st curved portion and corresponding auxiliary magnetic pole the 2nd curved portion partly that alternately connect corresponding main pole part.The curvature of ratio of curvature the 1st curved portion of the 2nd curved portion is big.As the 1st curved portion and the 2nd curved portion, indicated the example that adopts circular arc.

In addition, in the motor of aforementioned TOHKEMY 2001-69701 communique and aforementioned TOHKEMY 2002-95194 communique, the place of the space minimum between the tooth of stator and the rotor periphery is a point-like part partly corresponding with pole center on the cross section of rotor periphery.Therefore compare with the certain situation of the peripheral radius of rotor, the torque coefficient of the motor of two documents (the exportable moment of torsion of per unit electric current) diminishes.

In the motor of aforementioned TOHKEMY 2002-136011 communique, the space between the tooth of stator and the periphery of rotor all changes widely in the value of aforementioned circumferential section and the value of aforementioned ditch shape part.Therefore, be difficult to suppress torque ripple.If ditch depth, the torque coefficient of the motor of then aforementioned TOHKEMY 2002-136011 communique is littler than the torque coefficient of the motor of aforementioned TOHKEMY 2001-69701 communique and aforementioned TOHKEMY 2002-95194 communique.

In the motor of aforementioned TOHKEMY 2004-260972 communique, shown in Figure 1 as the document, the core portion between the main pole of rotor is broad.Just become the structure that utilizes reluctance torque easily.Thereby disclose a kind of decline that suppresses the mean value of output torque, can reduce the sound of motor and the technology of vibration simultaneously.

Summary of the invention

The object of the present invention is to provide a kind of in the decline of the mean value that suppresses output torque, the permanent magnet buried type electric rotating machine of structure (that is the narrow structure of the core portion between main pole) of raising that reluctance torque is not used for the mean value of output torque.If set spacing between magnetic pole commodiously, then, therefore this is suppressed because torque ripple [hereinafter referred to as torque ripple (the change width of output torque)] worsens.And, by making the torque waveform high repsization, can reduce torque ripple and reduce sound and vibration.The invention further relates to air conditioner for vehicles motor and sealed electrical compressor.

To achieve these goals, the invention provides a kind of electric rotating machine of equipping the ring-type stator.Stator has the tooth of all a plurality of layouts in this stator.Form slit between the tooth of adjacency.Electric rotating machine have the coil that in aforementioned slots, is provided with and by stator former around rotor and a plurality of permanent magnets of burying underground at this internal rotor.Each permanent magnet has the pole center part.With in a plurality of parts of the periphery of the corresponding respectively aforementioned rotor of a plurality of aforementioned pole centers parts a plurality of circumferential sections are set.Each circumferential section is the part with the concentric periphery of the pivot axis of aforementioned rotor.Aforementioned a plurality of circumferential section leaves in a circumferential direction mutually.Each of a plurality of convex parts connects each adjacent a pair of aforementioned circumferential section.Each convex partly is positioned at than aforementioned periphery position in the inner part radially, protrudes towards radial outside simultaneously.Each convex partly has a plurality of bights of protruding towards radial outside.

By following detailed description be used to illustrate that the accompanying drawing of feature of the present invention will be appreciated that other features and advantages of the present invention.

Description of drawings

Especially, will be appreciated that by additional claim the present invention has the feature of novelty.The explanation and the accompanying drawing of the currently preferred embodiment that illustrates below the reference will be understood that purpose of the present invention and benefit.

Figure 1A is the elevational cross-sectional view according to the motor stator and the rotor of first embodiment of the invention.

Figure 1B is the amplification elevational cross-sectional view of Figure 1A part.

Fig. 2 is the stator of Figure 1A and the side view cutaway drawing of rotor.

Fig. 3 is the axis side view of the stator of Figure 1A.

Fig. 4 is the view of waveform winding of the coil in the stator of explanation Figure 1A.

Fig. 5 is the more detailed section view of Figure 1B.

Fig. 6 is the amplification view of Fig. 5.

Fig. 7 A is that the FEM (Finite Element) that the torque coefficient of embodiment rotor 15 and 1-the 4th comparative example rotor 21-24 is shown resolves routine chart.

Fig. 7 B is that the FEM that the torque ripple of embodiment rotor 15 and 1-the 4th comparative example rotor 21-24 is shown resolves routine chart.

Fig. 8 A is the chart that is used to illustrate the tooth active force;

Fig. 8 B is the chart that is used to illustrate the moment of torsion change;

Fig. 9 A and Fig. 9 B are the charts that is used to illustrate the auxiliary magnetic pole of embodiment rotor 15;

Fig. 9 C is the chart that is used for key diagram 9A situation lower tooth active force;

Fig. 9 D is the chart that is used for key diagram 9B situation lower tooth active force;

Figure 10 is the chart of expression reluctance torque utilance;

Figure 11 be illustrate and bridge between angle Θ b and torque ripple rate than the chart of the relation of Rx/Ri;

Figure 12 A and Figure 12 B are the column diagrams that the number of times ratio of components of torque ripple is shown;

Figure 13 is the chart that the variation of the reluctance torque relevant with single tooth is shown;

Figure 14 A is the chart that the variation of synthetic reluctance torque is shown;

Figure 14 B is the chart that the variation of magnet moment of torsion is shown;

Figure 14 C is the chart that synthetic torque waveform is shown;

Figure 15 A is the chart of variation of space gh1 that the embodiment rotor 15 of Fig. 6 is shown;

Figure 15 B is the chart of variation of space gh2 that the 5th comparative example rotor 25 of Figure 17 is shown;

Figure 16 is the chart of change that the output torque of the 1st comparative example rotor 21 is shown;

Figure 17 is the phantom of the 5th comparative example rotor 25;

Figure 18 A and Figure 18 B be used for illustrating with curve Q1rm torque ripple and curve Q2rm in the different chart of torque ripple.

Figure 19 A and Figure 19 B be used for illustrating with curve Q1rm torque ripple and curve Q2rm in the different chart of torque ripple.

Figure 20 A-Figure 20 F be used for illustrating with curve Q1rm torque ripple and curve Q2rm in the different chart of torque ripple.

Figure 21 A is the part positive view that shows the 1st comparative example rotor 21.

Figure 21 B is the part positive view that shows the 2nd comparative example rotor 22.

Figure 21 C is the part positive view that shows the 3rd comparative example rotor 23.

Figure 21 D is the part positive view that shows the 4th comparative example rotor 24.

Figure 22 A-Figure 22 C is used to illustrate that the torque ripple rate is the chart of determining of the proper range of angular width A below 1 and angular width θ c than Rx/Ri.

Figure 23 A-Figure 23 C is used to illustrate that the torque ripple rate is the chart of determining of the proper range of angular width A below 1 and angular width θ c than Rx/Ri.

Figure 24 is that the torque ripple rate that illustrates under the angular width θ c situation of change that makes embodiment rotor 15 is more routine than the FEM parsing of the variation of Rx/Ri.

Figure 25 is that the torque ripple rate that illustrates under the angular width θ c situation of change that makes embodiment rotor 15 is more routine than the FEM parsing of the variation of Rx/Ri.

Figure 26 A-26C is the chart of determining that is used to illustrate the proper range of the angular width A that consists of for 18 times below 0.7 times and angular width θ c.

Figure 27 A-27C is the chart of determining that is used to illustrate the proper range of the angular width A that consists of for 18 times below 0.7 times and angular width θ c.

Figure 28 A-28C be used for illustrating size that the basic number of times of torque ripple (18 times form) forms less than form for 36 times big or small the time angular width A and angular width θ c the chart of determining of proper range.

Figure 29 is that the torque ripple rate is more routine than the FEM parsing of the variation of the difference of Rx/Ri than torque ripple rate in 36 components of Rx/Ri and torque ripple in 18 components that illustrate under the angular width θ c situation of change that makes embodiment rotor 15.

Figure 30 A is the phantom of the present invention's the 2nd embodiment motor.

Figure 30 B and Figure 30 C are the partial enlarged drawing of Figure 30 A.

The sectional view of the compressor integral body that Figure 31 is suitable for for the present invention.

Embodiment

To the 1st embodiment of the present invention be described according to Fig. 1-Figure 29 below.

According to Figure 1A, stator 11 is made of the coil 13 that is provided with in toroidal cores 12 and the slit 122 between a plurality of teeth 121 of arranging in interior week of this core 12.In the present embodiment, the number of tooth 121 and slit 122 is 18.Slit 122 is arranged in the circumferencial direction equal intervals of annular stator 11 (equal angles spacing).As shown in Figure 2, a plurality of central layers 14 of being made by magnetic (steel plate) of core 12 pile up formation.The coil 13 that is provided with in slit 122 is wound as the waveform winding.

Generally, number of poles is that p (integer), the number of phases are that the slit number that m (integer), every extremely every slit number that has mutually are q (q=0.5,1,1.5,2,2.5...... increase by 0.5 so successively), stator is under the situation of K, and following relational expression is set up.

K＝q×p×m

For example, under the situation of 3 phases, q=1, the pass that slit is counted K and number of poles p is 4 utmost points, 12 slits, 6 utmost points, 18 slits, 8 utmost points, 24 slits etc.For example, under the situation of 3 phases, q=1.5, the pass that slit is counted K and number of poles p is 4 utmost points, 18 slits, 6 utmost points, 27 slits, 8 utmost points, 36 slits etc.

Hereinafter will be introduced in conjunction with the waveform winding that has 6 utmost points, 18 slits in the Fig. 3 and the 4 pairs of above-mentioned examples.Waveform winding in the stator 11 as shown in Figure 4, the U phase line astragal (13U represents by symbol) that is connected with the U phase terminal 101 of inverter 10 passes through in the 1st slit group of (122U represents by symbol).The U phase line astragal (13V represents by symbol) that is connected with the V phase terminal 102 of inverter 10 passes through in the 2nd slit group of (122V represents by symbol), and the W phase line astragal (13W represents by symbol) that is connected with the W phase terminal 103 of inverter 10 passes through in the 3rd slit group of (122W represents by symbol).The solid line of each winding wire 13U, 13V, 13W partly carries out the part of distribution for the paper of relative Fig. 4, end face in stator 11 front sides, the dotted portion of each winding wire 13U, 13V, 13W is the part that the paper of relative Fig. 4, the end face in stator 11 subtends carry out distribution.The solid line part of each winding wire 13U, 13V, 13W and the coupling part of dotted portion are by slit 122U, 122V, 122W.Symbol N represents the neutral point with the terminal connection of each winding wire 13U, 13V, 13W.

Shown in Figure 1A, the rotor 15 of embodiment is made of permanent magnet 17A, the 17B of core 16 and a plurality of (in the present embodiment being 6) writing board shape of burying underground in core 16.A plurality of permanent magnet 17A, 17B are all with shape size together.As shown in Figure 2, a plurality of central layers 18 of being made by magnetic (steel plate) of core 16 pile up formation.The core of core 16 runs through and is provided with axis hole 161.The output shaft (not shown) passes through in axis hole 161 and is fixing in core 16.

Shown in Figure 1A, many group the 1st permanent magnet 17A and the 2nd permanent magnet 17B embed respectively along axis hole 161 bearing of trends and run through on core 16 in a plurality of accommodation holes 162 of setting, and permanent magnet 17A, 17B are adjacent to be embedded in the core 16 as magnetic pole on the circumferencial direction of embodiment rotor 15.The magnetic pole of adjacent pair of permanent magnets 17A, 17B is different mutually on the circumferencial direction of embodiment rotor 15.In other words, a plurality of permanent magnet 17A, 17B in a circumferential direction alternating polarity differently bury underground.

Each permanent magnet 17A, 17B have the pole center part 173 in the 1st magnetic pole the 171, the 2nd magnetic pole 172, the centre position between the 1st magnetic pole 171 and the 2nd magnetic pole.The permanent magnet 17A orthogonal of the relative writing board shape of radius 151A of the embodiment rotor 15 of the pole center part 173 by permanent magnet 17A.Equally, the permanent magnet 17B orthogonal of the relative writing board shape of radius 151B of the embodiment rotor 15 of the pole center part 173 by permanent magnet 17B.Radius 151A, the 151B that links to each other with the pivot axis C of embodiment rotor 15 is center equal angles (60 °) at interval with pivot axis C.Permanent magnet 17A, 17B are positioned at the equidistant position of pivot axis C with embodiment rotor 15, and permanent magnet 17A, 17B uniformly-spaced arrange on the circumferencial direction of embodiment rotor 15.

At the two ends of accommodation hole 162 (magnetic pole 171,172 near) space 163 is set.In accommodation hole 162, hold under the state of permanent magnet 17A, 17B the residual space 163 that prevents that the magnetic circuit short circuit from using at the two ends of permanent magnet 17A, 17B.

Shown in Figure 1B, it is circumferential section 19A, the 19B of radius centered R that the outer peripheral portion of the embodiment rotor 15 that equates with the angular width A that with radius 151A, 151B is the center forms with pivot axis C.Radius 151A intersects with the circumferencial direction center 191 of circumferential section 19A, and radius 151B intersects with the circumferencial direction center 191 of circumferential section 19B.In other words, the radius 152 of the 1st ora terminalis 192 by circumferential section 19A, 19B and the angular width between radius 151A, the 151B equal the radius 153 of the 2nd ora terminalis 193 by circumferential section 19A, 19B and the angular width between radius 151A, the 151B.The periphery that is the center by the 1st ora terminalis 192 and the 2nd ora terminalis 193 with pivot axis C is called imaginary circle side face E.

Be positioned on radius 151A, the 151B at the circumferencial direction center 191 of circumferential section 19A, 19B, radius 151A, 151B are center equal angles (60 °) at interval with pivot axis C.In other words, circumferential section 19A, 19B arrange equidistantly that in a circumferential direction circumferential section 19A, 19B are corresponding with the pole center part 173 of permanent magnet 17A, 17B.

And the corresponding circumferential section 19A of permanent magnet 17A and and the corresponding circumferential section 19B of permanent magnet 17B between separate each other.Circumferential section 19A is bound up with adjacent circumferential section 19B by the convex part 20 protruded towards the radial outside of embodiment rotor 15.

The convex part 20 that the 1st ora terminalis 192 (or the 2nd ora terminalis 193) of the 2nd ora terminalis 193 (or the 1st ora terminalis 192) of circumferential section 19A and circumferential section 19B is connected is connected to form by the 1st plane H1, the 2nd plane H2, the 3rd plane H3.The 1st plane H1 is parallel with the plane H of the 2nd ora terminalis 193 with respect to connecting the 1st ora terminalis 192.The 2nd plane H2 connects the 1st edge and the 1st ora terminalis 192 of the 1st plane H1.The 3rd plane H3 connects the 2nd edge and the 2nd ora terminalis 193 of the 1st plane H1.In Figure 1B, plane H, the 1st plane H1, the 2nd plane H2 and the 3rd plane H3 are expressed as the cross section of the imaginary plane (paper of Figure 1B) vertical with relative pivot axis C respectively, also promptly are expressed as straight line.Below, also plane H is replaced as straight line H, the 1st plane H1 is replaced as the 1st straight line H1, the 2nd plane H2 is replaced as the 2nd straight line H2, the 3rd plane H3 is described with being replaced as the 3rd straight line H3.

The 1st adjacent straight line H1 and the 2nd straight line H2 form the bight H11 towards the obtuse angle shape of the radial outside protrusion of embodiment rotor 15, and the 1st adjacent straight line H1 and the 3rd straight line H3 form the bight H12 towards the obtuse angle shape of the radial outside protrusion of embodiment rotor 15.

The center of the 1st straight line H1 of convex part 20 is corresponding with the magnetic pole switching part 164 between the 1st permanent magnet 17A and the 2nd permanent magnet 17B.In other words, pore size between the periphery of tooth 121 and embodiment rotor 15 (interval between the periphery of periphery E and embodiment rotor 15 also promptly) is and in adjacent pair of permanent magnets 17A, magnetic pole switching part 164 corresponding space G maximums between the 17B.In other words, the radius of embodiment rotor 15 is in the part minimum corresponding with space G.

The convex part radius 154 in the centre position 201 of connection pivot axis C shown in Figure 5 and convex part 20.Centre position 201 is the position of middle on the 1st ora terminalis 192 of circumferential section 19A, 19B and the convex part 20 between the 2nd ora terminalis 193.Also promptly, convex part radius 154 is positioned on the convex part 20 convex part 20 position of 2 five equilibriums in a circumferential direction.In the lower part, convex part radius 154 is designated as 2 bisectors 154.

The length of convex part radius 154 is the minimum range of convex part 20 and pivot axis C.Below, the minimum range of convex part 20 and rotation centerline C is designated as minimum range Rmin.Dh represents the centre position 190 of periphery E and the air line distance between the centre position 201.2 five equilibriums are carried out with the periphery E between the 1st ora terminalis 192 and the 2nd ora terminalis 193 in centre position 190, are positioned on the extended line of convex part radius 154.Dh represents the difference of radius R and the minimum range Rmin of circumferential section 19A, 19B.

The 1st straight line H1 is vertical with convex part radius 154 in aforementioned imaginary plane (paper of Figure 1B), and the 1st straight line H1 leaves difference Dh from 190 of middle positions diametrically.Hereinafter Dh is described as depth D h.From the distance of the 1st ora terminalis (the 1st bight H11) of centre position 201 to the 1st straight line H1 of the 1st straight line H1 with identical to the distance of the 2nd ora terminalis (the 2nd bight H12).Thereby, with pivot axis C be the center the 2nd straight line H2 angular width and be that the angular width of the 3rd straight line H3 at center becomes onesize angular width θ c with pivot axis C.

Convex part 20 is protruded in the scope in periphery E inboard and the straight line H outside and towards the radial outside of embodiment rotor 15.Periphery E comprises circumferential section 19A, 19B and has radius R.Straight line H connects the 1st ora terminalis 192 and the 2nd ora terminalis 193.In the scope of convex part 20 between periphery E and straight line H in other words, (remove that periphery E goes up and straight line H on scope) and towards the radial outside protrusion of embodiment rotor 15.Also promptly, bight H11, H12 (two ora terminalis of the 1st straight line H1) are positioned at the radially inner side of periphery E and are positioned at the radial outside of straight line H.Therefore, the 2nd straight line H2 and the 3rd straight line H3 are with respect to convex part 20 relation of 2 bisectors, the 154 mirror image symmetries (left-right symmetric) of 2 five equilibriums in a circumferential direction, and an across corner H11, H12 are the relation with respect to 2 bisectors, 154 mirror image symmetries (left-right symmetric).

As shown in Figure 6, straight line H2, H3 are called H21, H31 from the extended line that bight H11, H12 extend to periphery E intersection location E2, E3.The length of straight line H2, the H3 of both sides is longer than extended line H21, H31 among three straight line H1, H2, the H3.

Each convex part 20 forms by connecting the 1st straight line H1, the 2nd straight line H2 and the 3rd straight line H3, and any all is with size with shape in each convex part 20.

Below, the minimum range of straight line H and pivot axis C is designated as minimum range Hr (shown in Figure 5).

Dmax shown in Fig. 6 represents the air line distance between centre position Ho and the centre position 190, and expression radius R and minimum range Rmin's is poor.Below, Dmax is designated as imaginary maximum difference Dmax.Imagination maximum difference Dmax=R * 1-cos ([(360 °/p)-A]/2), depth D h is littler than imaginary maximum difference Dmax.A is the angular width of each circumferential section 19A, 19B.

As shown in Figure 6, the straight line that plays the 1st straight line H1 from pivot axis C comprises and connects the point 165 that is positioned on the differentiation wall that short circuit prevents space 163 and the line segment Br1 of the point 204 on the 1st straight line H1, and the part of above-mentioned straight line and the accommodation hole 162 that holds the 1st permanent magnet 17A, is that short circuit prevents that the differentiation wall in space 163 from intersecting.Equally, the straight line that plays the 1st straight line H1 from pivot axis C comprises and connects the point 166 that is positioned on the differentiation wall that short circuit prevents space 163 and the line segment Br2 of the point 205 on the 1st straight line H1, and the part of above-mentioned straight line and the accommodation hole 162 that holds the 2nd permanent magnet 17B, is that short circuit prevents that the differentiation wall in space 163 from intersecting.

Bmin1 represents a little 165 and put air line distance between 204, and Bmin2 represents a little 166 and put air line distance between 205.Air line distance Bmin1, Bmin2 represent the length of short lines in the straight line of the differentiation wall in Lian Jie Rong Satisfied hole 162 and the 1st straight line H1, Bmin1=Bmin2.Also be, point 165 and the compartment Br1 that puts between 204 become the differentiation wall of the accommodation hole 162 that holds the 1st permanent magnet 17A and the minimum interval between the convex part 20, and point 166 and the compartment Br2 that puts between 205 become the differentiation wall of the accommodation hole 162 that holds the 2nd permanent magnet 17B and the minimum interval between the convex part 20.Hereinafter compartment Br1 is designated as minimum interval part Br1, compartment Br2 is designated as minimum interval part Br2.Point 165 is designated as the starting point 165 of minimum interval part Br1, and point 166 is designated as the starting point 166 of minimum interval part Br2.In other words, starting point 165 becomes and distinguishes in the adjacent a pair of accommodation hole 162 point of distinguishing on the wall with the interval minimum of convex part 20.Starting point 166 becomes the point of the interval minimum of the differentiation wall of distinguishing another accommodation hole 162 and aforementioned convex part 20.

Angular width between the radius 156 that Θ b shown in Fig. 5 and Fig. 6 represents to connect the radius 155 of pivot axis C and starting point 165 and connect pivot axis C and starting point 166.Also promptly, Θ b represents the angular width that starting point 165 and starting point 166 are formed centrally in pivot axis C being.Starting point 165 is starting point minimum interval part Br1, an aforementioned accommodation hole 162 between and the convex part 20 in the adjacent a pair of accommodation hole 162.Starting point 166 is starting point minimum interval part Br2, aforementioned another accommodation hole 162 between another and the convex part 20 in the adjacent a pair of accommodation hole 162.Hereinafter Θ b is designated as angle Θ b between bridge.

Specificly go out the starting point 165,166 of angle Θ b between bridge according to following regulation.Parallel mobile straight line H1, the point that is connected with the differentiation wall of the accommodation hole 162 that holds the 1st permanent magnet 17A temporarily is designated as H01, parallel mobile straight line H3, the point that is connected with the differentiation wall of the accommodation hole 162 that holds the 1st permanent magnet 17A temporarily is designated as H30.Among these 2 H01, H30, straight line H1 and point between the H01 distance and the short-and-medium employing of the distance between straight line H3 and the some H30 as starting point 165.Parallel mobile straight line H1, the point that is connected with the differentiation wall of the accommodation hole 162 that holds the 2nd permanent magnet 17B temporarily is designated as H02, parallel mobile straight line H2, the point that is connected with the differentiation wall of the accommodation hole 162 that holds the 2nd permanent magnet 17B temporarily is designated as H20.Among these 2 H02, H20, straight line H1 and point between the H02 distance and the short-and-medium employing of the distance between straight line H2 and the some H20 as starting point 166.

According to the shape in accommodation hole 162 (space 163), aforesaid some H01, H02 or H20 might exist a plurality of or numerous.In this case, angular width Θ b exists a plurality of or numerous.Between aforementioned bridge angle Θ b represent with the corresponding starting point 165 of minimum interval part Br1 and with the corresponding starting point 166 of minimum interval part Br2 be angular width maximum in the angular width that forms of center with pivot axis C.

The column diagram of Fig. 7 A illustrates according to FEM (Finite Element) and resolves the torque coefficient obtain embodiment rotor 15 and by the example of the torque coefficient of the 1st comparative example rotor 21-the 4th comparative example rotor 24 shown in Figure 21 A-21D as a comparative example.So-called torque coefficient is exactly the mean value of output torque of the electric rotating machine numerical value after divided by current effective value.The FEM that the column diagram of Fig. 7 B illustrates the torque ripple of the torque ripple of embodiment rotor 15 and 1-the 4th comparative example rotor 21-24 resolves example.So-called torque ripple is exactly the change width size of output torque.Any all is assemblied on the identical stator 11 among embodiment rotor 15 and 1-the 4th comparative example rotor 21-24.Situation with embodiment rotor 15 under the configuration of permanent magnet 17A, 17B and arbitrary situation of size in 1-the 4th comparative example rotor 21-24 is all identical.

Common condition is as follows in this FEM parsing example: the width 17W (shown in Figure 5) of permanent magnet 17A, 17B is littler than the radius R of circumferential section 19A, the 19B of core 16 (embodiment rotor 15), space g is (shown in Figure 5, gap length between circumferential section 19A, 19B and the tooth 121)=0.5mm, number of poles p=6, the number=p of slit 122 * 3=18.

Shown in Figure 21 A, the periphery of the 1st comparative example rotor 21 is the periphery E of radius R.Shown in Figure 21 B, the periphery of the 2nd comparative example rotor 22 is made of circumferential section 19A, the 19B of radius R and the plane H (straight line H) of connection adjacent circumferential part 19A and circumferential section 19B.Shown in Figure 21 C, the periphery of the 3rd comparative example rotor 23 is made of circumferential section 19A, the 19B of radius R and the concave portions 231 of connection adjacent circumferential part 19A and circumferential section 19B.Concave portions 231 is than the arc surface of plane H at the radially inner side fovea superior.Shown in Figure 21 D, magnetic pole switching part 164 places between permanent magnets adjacent 17A, 17B, the radius minimum of the 4th comparative example rotor 24, and pole center part 173 places between pole end piece 171,172, the radius maximum of the 4th comparative example rotor 24, therefore the periphery of the 4th comparative example rotor 24 becomes the side face (sine wave shape part 241) of sinusoidal waveform shape.The radius 151A of the 4th comparative example rotor 24, the length of 151B are R.The minimum range of the sine wave shape part 241 of the 4th comparative example rotor 24 and pivot axis C is bigger than the minimum range of the straight line H1 of the 2nd comparative example rotor 22 and pivot axis, than the concave portions 231 of embodiment rotor 15 and the minimum range of pivot axis C.

Torque coefficient under the situation of the 1st comparative example rotor 21 among the post B1 presentation graphs 21A in the chart of Fig. 7 A is 1.Post Bo in the chart of Fig. 7 A represents the ratio of the torque coefficient phase coupled columns B1 of embodiment rotor 15.The ratio of the torque coefficient phase coupled columns B1 of the 2nd comparative example rotor 22 among the post B2 presentation graphs 21B.The ratio of the torque coefficient phase coupled columns B1 of the 3rd comparative example rotor 23 among the post B3 presentation graphs 21C.The ratio of the torque coefficient phase coupled columns B1 of the 4th comparative example rotor 24 among the post B4 presentation graphs 21D.

Post D1 in the chart of Fig. 7 B represents that the torque ripple of the 1st comparative example rotor 21 is 1.Post Do represents the ratio of the torque ripple of embodiment rotor 15 with respect to post D1.Post D2 represents the ratio of the torque ripple of the 2nd comparative example rotor 22 with respect to post D1.Post D3 represents the ratio of the torque ripple phase coupled columns D1 of the 3rd comparative example rotor 23.Post D4 represents the ratio of the torque ripple phase coupled columns D1 of the 4th comparative example rotor 24.

The figure of Fig. 8 A expresses the relation of the active force of the position of rotation of rotor and any tooth 121.The waveform Δ illustrates desirable example.Waveform Δ and transverse axis form isosceles triangle, and initiating terminal and the angle intervals between the clearing end that the base of this isoceles triangle shape illustrates on the transverse axis are 40 °.If relevant all this waveform Δs of tooth 121 are combined, then obtain the horizontal linear T Δ in Fig. 8 B chart.Also promptly, if the waveform of the active force of a tooth 121 is the waveform Δ, output torque certain (T Δ) then, torque ripple is zero.

Waveform E λ in the chart of Fig. 8 A illustrates the relation of any tooth 121 active force of the position of rotation of the 1st comparative example rotor 21 of Figure 21 A and the 1st comparative example rotor 21.In case this waveform E λ of whole teeth 121 of relevant the 1st comparative example rotor 21 is combined, then obtains the synthetic waveform Te among Fig. 8 B.Also promptly, if the power of the active force of a tooth 121 for representing with waveform E λ then produces the non-vanishing output torque of torque ripple.Also promptly, if the shape of the shape of waveform E λ and waveform Δ is approaching more, can make the torque ripple of electric rotating machine diminish more.

For embodiment rotor 15, calculate FEM resolves under the condition of b=5.2 ° of angle Θ between aforementioned common analysis condition and bridge result, torque ripple rate Ri.So-called torque ripple rate is exactly the value that obtains behind the mean value of torque ripple (the change width size of output torque) divided by output torque.This torque ripple rate Ri of embodiment rotor 15 is littler than the torque ripple rate of the 1st comparative example rotor 21 of Figure 21 A FEM analysis result under the condition of b=10 ° of angle Θ between aforementioned common analysis condition and bridge.Hereinafter, use the 1st comparative example rotor 21 of Figure 21 A, relative with the torque ripple rate Ri of FEM analysis result under the condition of b=5.2 ° of angle Θ between aforementioned common analysis condition and bridge, perhaps the ratio R x/Ri of torque ripple rate Rx is called torque ripple rate ratio.The torque ripple rate is directly proportional with torque ripple rate Rx than Rx/Ri.

Curve Z1 in the chart of Fig. 9 A is illustrated in the distribution of magnetic flux density in the outer peripheral face that angle Θ b between angular width A=28 °, angular width θ c=13 °, bridge is an embodiment rotor 15 under 5.2 ° the situation.Transverse axis is represented the angle position between the centre position 201 of the centre position 201 of the convex part 20 corresponding with magnetic pole switching part 164 and adjacent convex part 20.The longitudinal axis is represented magnetic flux density.The angle position in centre position 201 is 0 ° or 60 °.E λ 1 in the chart of Fig. 9 C is illustrated in the relation of active force of a tooth 121 of position of rotation that angle Θ b between bridge is an embodiment rotor 15 under 5.2 ° the situation and embodiment rotor 15.

Curve Z2 in the chart of Fig. 9 B is illustrated in the distribution of magnetic flux density in the outer peripheral face that angle Θ b between angular width A=28 °, angular width θ c=13 °, bridge is an embodiment rotor 15 under 12 ° the situation.Transverse axis is represented the angle position between the centre position 201 of the centre position 201 of the convex part 20 corresponding with magnetic pole switching part 164 and adjacent convex part 20.The longitudinal axis is represented magnetic flux density.It is under 12 ° the situation that E λ 2 in the chart of Fig. 9 D is illustrated in angle Θ b between bridge, the relation of the active force of a tooth 121 of the position of rotation of embodiment rotor 15 and embodiment rotor 15.

Fig. 9 A-9D is for resolving the result who obtains according to each FEM.Among Fig. 9 A, magnetic flux density is that the zone (zone than zero big scope is shown on the transverse axis of outer peripheral face position of embodiment rotor 15) of the outer peripheral face of zero embodiment rotor 15 does not exist, and having magnetic flux density among Fig. 9 B is the zone of the outer peripheral face of zero embodiment rotor 15.Curve E λ 1 compares with curve E λ 2, is similar to the shape of waveform Δ.Also promptly, be (hereinafter referred to as the non-existent state of auxiliary magnetic pole in the distribution of magnetic flux density under zero the regional non-existent situation.With reference to Fig. 9 A and 9C), be (hereinafter referred to as state under the situation in zero zone with having in the distribution of magnetic flux density with auxiliary magnetic pole.With reference to Fig. 9 B and 9D) to compare, torque ripple diminishes.

Illustrated angular width among Figure 1B

For and the short circuit of the 1st permanent magnet adjacency prevent the adjacent short circuit of space 163 and adjacent therewith the 2nd permanent magnet 17B prevent between the space 163, be the angular width at center with pivot axis C.Also promptly, angular width

For with radius 157,158 (is the radius centered line with pivot axis C) that adjacent a pair of short circuit prevents from the space to carry out line and contact between angle.Angular width

Size be below the size of angle Θ b between bridge.Angular width

Be under 10 ° the situation, resolve according to FEM and confirm the non-existent state of auxiliary magnetic pole.Also promptly, angle Θ b also becomes the non-existent state of auxiliary magnetic pole under 10 ° the situation between bridge.

Have under the state of auxiliary magnetic pole, the non-existent state of the relative auxiliary magnetic pole of ratio (hereinafter referred to as the utilization rate of reluctance torque) that occupies of the reluctance torque relative with the mean value of output torque improves.According to FEM analysis result in Figure 10 chart, in case angle Θ b surpasses 10 ° between bridge, then the utilization rate of reluctance torque rises rapidly.Stain in Figure 10 chart is a real data.

In other words, has in the structure (for example, the disclosed structure of Fig. 1 of TOHKEMY 2004-260972 communique) that effectively utilizes reluctance torque under the state of auxiliary magnetic pole the active force E λ of tooth distortion, the shape of power E λ upwards departs from from the shape of waveform Δ, and torque ripple worsens.

Relative therewith, the present invention is the non-existent state of auxiliary magnetic pole (Fig. 9 A and Fig. 9 C).By this, reduce the raising of the mean value of output torque in the reluctance torque, the active force E λ and the waveform Δ of a tooth are approaching, attempt to reduce torque ripple.

The figure of Figure 11 express with bridge between the corresponding torque ripple rate of angle Θ b than the variation of Rx/Ri.Angular width A is 28 °, and angular width θ c is 13 °.Figure 11 is for resolving the result who obtains according to FEM, and the stain in the chart of Figure 11 is a real data.From the chart of Figure 11 as can be known, if angle Θ b is less than 10 ° between bridge, then the torque ripple rate than Rx/Ri less than 1.

Angle Θ b is below 10 ° the time between bridge, can increase the main magnet width, can suppress the decline of the mean value of output torque.

Figure 12 A is a column diagram, and it illustrates the number of times ratio of components of torque ripple in the specific times that will use output torque under the situation of convex part 20 to carry out fourier progression expanding method and obtain.Angle Θ b is set at 5.2 ° between bridge, and angular width A is set at 28 °.Depth D h is set at 0.3mm, and angular width θ c is set at 13 °.

Figure 12 B is a column diagram, and it illustrates that output torque with the 5th comparative example rotor 25 shown in Figure 17 carries out fourier progression expanding method and the number of times ratio of components of torque ripple in the specific times that obtains.Angle Θ b is set at 5.2 ° between bridge, and angular width A is set at 26 °.Depth D h is set at 0.5mm.Figure 12 A and Figure 12 B resolve the result who obtains according to FEM.

Form the outer peripheral face of the 5th comparative example rotor 25 shown in Figure 17 by convex part 26 connection adjacent circumferential part 19A and circumferential section 19B.Convex part 26 is the shape towards the radial outside protrusion of embodiment rotor 15.

The convex part 26 that connects the 1st ora terminalis 192 (or the 2nd ora terminalis 193) of the 2nd ora terminalis 193 (or the 1st ora terminalis 192) of the 1st circumferential section 19A and the 2nd circumferential section 19B is the circular arc side face of the radius bigger than the radius R of circumferential section 19A, 19B.Each convex part 26 each all with shape with size.Thereby, convex part 26 the radially inner side of the periphery E of the radius R that comprises circumferential section 19A, 19B and connect the 1st ora terminalis 192 and the scope of the radial outside of the plane H of the 2nd ora terminalis 193 in, protrude towards the radial outside of embodiment rotor 15.In other words, (removing on periphery E and the plane H) protrudes towards the radial outside of embodiment rotor 15 in the zone of convex part 26 between periphery E and plane H.

The magnetic pole switching part 164 of protruding end 261 correspondences of convex part 26 between the 1st permanent magnet 17A and the 2nd permanent magnet 17B.Also promptly, the pore size between the periphery of tooth 121 and the 5th comparative example rotor 25 (interval between the periphery of periphery E and the 5th comparative example rotor 25 also promptly) is the space G maximum corresponding to magnetic pole switching part 164.Also promptly, the radius of the 5th comparative example rotor 25 is in the part minimum of corresponding space G.

Post L1 among Figure 12 A illustrates the number of times ratio of components of the torque ripple of matrix number of times (=18).Post L2 illustrates the number of times ratio of components of torque ripple of 2 times number of times (=36) of basic number of times, and post L3 illustrates the number of times ratio of components of torque ripple of 3 times number of times (=54) of basic number of times.

Post L4 among Figure 12 B illustrates the number of times ratio of components of the torque ripple of basic number of times (=18).Post L5 illustrates the number of times ratio of components of torque ripple of 2 times number of times (=36) of basic number of times, and post L6 illustrates the number of times ratio of components of torque ripple of 3 times number of times (=54) of basic number of times.In addition, the number of times ratio of components of the torque ripple of post L4 is 1.

FEM analysis result according to Figure 12 A and Figure 12 B, during greatly the number of times of the basic number of times (=18) of control torque fluctuation was formed, the side of embodiment rotor 15 (the post L1 of Figure 12 A) with convex part 20 was littler than the situation of the 5th embodiment rotor 25 among Figure 17 (the post L4 of Figure 12 B).

Figure 13 is the chart that the variation of the reluctance torque relevant with single tooth 121 is shown.Curve Qr11 illustrates the variation of the reluctance torque under the situation of using the embodiment rotor 15 with convex part 20, and curve Qr21 illustrates the variation of the reluctance torque under the situation of using the 5th comparative example rotor 25 among Figure 17.

Curve Qr12 in the chart of Figure 14 A illustrates the synthetic synthetic reluctance torque that obtains of the curve Qr11 of Figure 13 relevant with the tooth separately 121 (18) of embodiment rotor 15 is changed.Curve Qr22 illustrates the synthetic synthetic reluctance torque that obtains of the curve Qr21 of Figure 13 relevant with the tooth separately 121 (18) of the 5th comparative example rotor 25 is changed.

Curve Qm1 in the chart of Figure 14 B is the chart that the variation of the moment of torsion (hereinafter referred to as magnet moment of torsion) relevant with the permanent magnet 17A, the 17B that use embodiment rotor 15 situations is shown.Curve Qm2 is the chart that the variation of the magnet moment of torsion relevant with the permanent magnet 17A, the 17B that use the 5th comparative example rotor 25 situations is shown.

Curve Q1rm in the chart of Figure 14 C is the torque waveform that the curve Qm1 of the curve Qr12 of Figure 14 A and Figure 14 B is synthetic.Curve Q2rm in the chart of Figure 14 C is the torque waveform that the curve Qm2 of the curve Qr22 of Figure 14 A and Figure 14 B is synthetic.In other words, curve Q1rm is for resolving the torque waveform that obtains according to FEM under the situation of embodiment rotor 15 that has convex part 20 in use, and curve Q2rm is for resolving the torque waveform that obtains according to FEM under the situation of the 5th comparative example rotor 25 that uses Figure 17.Curve Ξ is for resolving the torque waveform that obtains according to FEM in the chart of Figure 16 under the 1st comparative example rotor 21 situations of using Figure 21 A.Obviously the torque ripple among the curve Ξ of torque ripple among the curve Q1rm of torque waveform and torque waveform is different.

If comparison curves Q1rm, Q2rm, the torque ripple of being represented by curve Q1m is littler than the torque ripple of being represented by curve Q2rm as can be known.This difference is different based on the protuberance degree of bump Qro22 among the protuberance degree of bump Qro12 among the curve Qr12 of Figure 14 A and the curve Qr22.The different main causes of the protuberance degree of bump Qro12, Qro22 are the difference of the variation of the variation of space gh1 (gap length between convex part 20 shown in Figure 6 and the tooth 121) and space gh2 (gap length between convex part 26 shown in Figure 17 and the tooth 121).

Curve Gh1 in the chart of Figure 15 A illustrates the variation of space gh1, and the curve Gh2 in the chart of Figure 15 B illustrates the variation of space gh2.Being changed to from dullness of the space gh2 that curve Gh2 represents increases the figure that reduces to move towards dullness again after maximum moves.Being changed to of the space gh1 that curve Gh1 represents has the figure that reduces to increase towards dullness a pair of transform portion ho that transforms rapidly from dullness.Owing to the existence of bight H1, H2 produces a pair of transform portion ho.Also promptly, the existence of bight H1, H2 becomes big with the protuberance of the bump Qro12 of curve Qr12.

Shown in curve Q1rm among Figure 14 C, the synthetic torque ripple that makes with curve Qm1 of the curve Qr12 of synthetic reluctance torque of bump Qro12 so and magnet moment of torsion reduces.Shown in curve Q2rm among Figure 14 C, the synthetic torque ripple that also makes with curve Qm2 of the curve Qr22 of synthetic reluctance torque of bump Qro22 and magnet moment of torsion reduces.In addition, the degree that the torque ripple shown in the curve Q1rm reduces among Figure 14 C is littler than the degree that the torque ripple shown in the curve Q2rm among Figure 14 C reduces.

Hereinafter will describe torque ripple different of the torque ripple of curve Q1rm and curve Q2rm in detail according to Figure 18-20.

The different reason of the torque ripple of the torque ripple of curve Q1rm and curve Q2rm has following 2 points.

(1) in the difference of vibration of the composition of the basic number of times (18 times) of the amplitude of the composition of the basic number of times of reluctance torque (18 times) and magnet moment of torsion, curve Q1rm one side is littler than curve Q2rm.

(2) in the phase difference of the composition of the basic number of times (18 times) of the phase place of the composition of the basic number of times of reluctance torque (18 times) and magnet moment of torsion, curve Q1rm one side is more approaching with reverse phase than curve Q2rm.

The waveform of the composition of basic number of times (18 times) in the magnet moment of torsion under curve ∏ 1 expression use embodiment rotor 15 situations in the chart of Figure 18 A, the waveform of the composition of basic number of times (18 times) in the reluctance torque under curve ∏ 2 expression use embodiment rotors 15 situations.Curve ∏ 1 is positioned on the coordinate by the longitudinal axis TL (torque) in transverse axis (position of rotation) and left side expression, and curve ∏ 2 is positioned on the coordinate that the longitudinal axis TR (torque) by transverse axis (position of rotation) and right side represents.

The waveform of the composition of basic number of times (18 times) in the magnet moment of torsion under curve Ω 1 expression use the 5th comparative example rotor 25 (with reference to Figure 17) situation in the chart of Figure 18 B, the waveform of the composition of basic number of times (18 times) in the reluctance torque under curve Ω 2 expression uses the 5th comparative example rotor 25 situations.Curve Ω 1 is positioned on the coordinate by the longitudinal axis TL (torque) in transverse axis (position of rotation) and left side expression, and curve Ω 2 is positioned on the coordinate that the longitudinal axis TR (torque) by transverse axis (position of rotation) and right side represents.

If the curve ∏ 1, the ∏ 2 that use Figure 18 A under embodiment rotor 15 situations and the curve Ω 1, the Ω 2 that use Figure 18 B under the 5th comparative example rotor 25 situations are compared, then will be appreciated that the reason (feature) of aforementioned (1), (2).

The waveform Qr12 (with reference to Figure 14 A) of the synthetic reluctance torque of use embodiment rotor 15 situations possesses the feature of aforementioned (1), (2).Therefore, if will synthesize the waveform Qr12 of reluctance torque and the curve Qm1 of magnet moment of torsion synthesizes, then basic number of times (18 times) is formed and is offset, and stays composition 36 times, forms high repsization significantly.

Under the situation of the waveform Qr22 (with reference to Figure 14 A) that uses the synthetic magnetic resistance under the 5th comparative example rotor 25 situations, feature by aforementioned (1), (2), if will synthesize the waveform Qr22 of reluctance torque and the curve Qm2 of magnet moment of torsion synthesizes, the cancellation level that then basic number of times (18 times) is formed diminishes, and the torque ripple of curve Q2rm is bigger than change with curve Q1rm.

Hereinafter will describe aforementioned reason (1) in detail.

Under the situation of using the 5th comparative example rotor 25, changes of voids is variation level and smooth shown in Figure 15 B.Because constitute the interpolar part at the circular arc place of evagination, the reluctance torque change is level and smooth and less, the amplitude of composition waveform of the basic number of times of rotation (18 times) of forming relative magnet torque waveform as the rotation of the keynote of wavelength for 18 times is generally less.Possess in use under the situation of embodiment rotor 15 of bight H11, H12, because bight H11, H12 exist, space gh1 is shown in Figure 15 A.So changes of voids makes 18 times of synthetic reluctance torque to form and form significantly for 36 times.

Column diagram among Figure 19 A illustrates the result of the fourier progression expanding method of curve Qr12, and the column diagram among Figure 19 B illustrates the result of the fourier progression expanding method of curve Qr22.The size that 18 times of representing curve Qr12 fourier progression expanding method is obtained of post Bo1 are formed, the size that 36 times of representing curve Qr12 fourier progression expanding method is obtained of post Bo2 are formed.The size that 18 times of representing curve Qr22 fourier progression expanding method is obtained of post B51 are formed, the size that 36 times of representing curve Qr22 fourier progression expanding method is obtained of post B52 are formed.Understand that from Figure 19 A and Figure 19 B 18 compositions of 18 ratio of components curve Qr22 of curve Qr12 are big, 36 compositions of 36 ratio of components curve Qr22 of curve Qr12 are big.The amplitude of composition that this result helps the basic number of times (18 times) of reluctance torque equates with the amplitude of the composition of the basic number of times (18 times) of magnet moment of torsion.

Hereinafter will describe aforesaid reason (2) in detail.

The phase place of the waveform of 18 compositions of reluctance torque can be adjusted according to the occurrence positions of bump Qro12.For example, consider among Figure 20 D waveform ∏ 7 among the waveform ∏ 6 and Figure 20 E.Waveform ∏ 6 is the model waveform that the sinusoidal wave ∏ 4 of the sinusoidal wave ∏ 3 of Figure 20 A and Figure 20 B is merged generation, and waveform ∏ 7 is the model waveform that the sinusoidal wave ∏ 5 of the sinusoidal wave ∏ 3 of Figure 20 A and Figure 20 C is merged generation.The waveform ∏ 6 of Figure 20 D, 20E, ∏ 7 have the waveform of the different bump Qro of occurrence positions for same relatively sinusoidal wave ∏ 3.

The waveform ∏ 8 of Figure 20 F is 18 composition waveforms extracting out from the waveform ∏ 6 of Figure 20 D, and the waveform ∏ 9 of Figure 20 F is 18 composition waveforms extracting out from the waveform ∏ 7 of Figure 20 E.As can be known, the phase place of 18 composition waveform ∏ 8 is different with the phase place of 18 composition waveform ∏ 9 from Figure 20 F.Also promptly, by the change in location of bump Qro, can adjust the phase place of 18 composition waveform ∏ 8, ∏ 9.Also promptly, by the position of suitable setting bight H11, H12, adjust 18 times of reluctance torque on the opposite phase that can form 18 times of magnet moment of torsion and form.

So, in not having the 5th comparative example rotor 25 of bight H11, H12, can not make 18 times and form and form significantly for 36 times, and can not adjust the phase place of 18 compositions of reluctance torque.Therefore, different with the situation of embodiment rotor 15 in the 5th comparative example rotor 25, can not realize significant high repsization.

Obtain following effect by the 1st embodiment.

(1) as can be known, from the chart of Fig. 7 A under the situation of embodiment rotor 15 torque coefficient and peripheral radius certain (torque coefficient less changes under the situation of=R) the 1st comparative example rotor 21.Torque coefficient is bigger than torque coefficient under each situation of 2-the 4th comparative example rotor 22-24 in the situation of embodiment rotor 15.Also promptly, the situation of the suppression ratio embodiment rotor 15 of moment of torsion is big under each situation of 2-the 4th comparative example rotor 22-24, and moment of torsion descends significantly under each situation of 3-the 4th comparative example rotor 23-24 especially.

From the chart of Fig. 7 B as can be known, under the situation of embodiment rotor 15 torque ripple constant with peripheral radius (torque ripple is compared widely and is descended under the situation of=R) the 1st comparative example rotor 21.Torque ripple is also little than torque ripple under the situation of the 1st comparative example rotor 21 under each situation of 2-the 4th comparative example rotor 22-24, and torque ripple is littler than the torque ripple under each situation of 2-the 3rd comparative example rotor 22-23 under the situation of embodiment rotor 15.Torque ripple equal extent size under the situation of the torque ripple of the 4th comparative example rotor 24 and embodiment rotor 15, by the chart of Fig. 7 A as can be known, the situation of the torque ratio embodiment rotor 15 under the situation of the 4th comparative example rotor 24 has very big landing.

By the FEM analysis result shown in Fig. 7 A and Fig. 7 B as can be known, the size of embodiment rotor 15 and moment of torsion is relevant with the inhibition of torque ripple, and is therefore good than other 1-the 4th comparative example rotor 21-24.Space between the tooth 121 of stator 11 and the periphery of embodiment rotor 15 helps avoid moment of torsion at the minimum on the whole structure of circumferential section 19A, 19B and descends.Make the level and smooth convex part 20 of magnetic flux change in the outer peripheral face of embodiment rotor 15 help the inhibition of torque ripple, help avoid moment of torsion simultaneously and descend.In other words, relevant with the inhibition of the size of moment of torsion and torque ripple, embodiment rotor 15 has good result than other 1-the 4th comparative example rotor 21-24, produces by convex part 20 to connect the adjacent circumferential part 19A that separates, the structure of 19B.

(2) convex part 20 is connected to form by three straight line H1, H2, H3.By the FEM analysis result of Fig. 7 B as can be known, producing an across corner H11, H12 ground, to connect the inhibition of three straight line H1, H2,20 pairs of torque ripples of the formed convex part of H3 useful.

(3) by shown in Figure 14 C, equipment has in the 5th comparative example rotor 25 of convex part 26 of the embodiment rotor 15 of convex part 20 of bight H11, H12 and equipment circular shape each synthetic by magnet moment of torsion and synthetic reluctance torque, produces the high repsization of the waveform of output torque.In addition, in the reduction effect via the torque ripple of the high repsization of output torque, equipment has the side of embodiment rotor 15 of convex part 20 of bight H11, H12 than the 5th comparative example rotor 25 height of the convex part 26 of equipping circular shape.

In other words, under the situation with the output torque fourier progression expanding method, by the chart of Figure 12 A and Figure 12 B as can be known, have little than the 5th comparative example rotor 25 of convex part 26 of torque ripple that the basic number of times of output torque of the embodiment rotor 15 of the convex part 20 that connects three straight line H1, H2, H3 and form forms with circular shape.Also promptly, the convex part 20 with an across corner H11, H12 helps to make that the magnetic flux change is level and smooth in the outer peripheral face of embodiment rotor 15, and suppresses torque ripple.

The length of straight line H2, the H3 of both sides is longer than extended line H21, H31 (as shown in Figure 6) among (4) three straight line H1, H2, the H3.This structure produces the variation of the space gh1 shown in curve Gh1 among Figure 15 A.Straight line H2, H3 than extended line H21, H31 long be configured in output torque high reps aspect favourablely, be used to reduce the torque ripple that the basic number of times of output torque is formed.

(5) angle Θ b is in the structure of 0＜Θ b≤10 ° scope between the setting bridge, be in the non-existent state of auxiliary magnetic pole, and the torque ripple rate is below 1 than Rx/Ri.Thereby torque ripple (size of the change width of output torque) diminishes divided by the value behind the mean value of output torque (torque ripple rate).Also promptly, angle Θ b is the non-existent state of structure generation auxiliary magnetic pole of 0＜Θ b≤10 ° scope between the setting bridge, and is good aspect inhibition torque ripple (size of the change width of output torque).

(6) analysis result of Fig. 7 A and Fig. 7 B with circumferential section 19A, 19B in a circumferential direction spaced set be that prerequisite obtains.Also promptly, a plurality of circumferential section 19A of spaced set, 19B be configured to prevent that moment of torsion from descending and suppress the useful structure in torque ripple aspect.

(7) maximum interspace between the periphery of tooth 121 and embodiment rotor 15 be with at adjacent pair of permanent magnets 17A, the corresponding space G of magnetic pole switching part 164 between the 17B.Will space G maximized the be configured with change in magnetic flux density that help relax rapidly corresponding with magnetic pole switching part 164, suppress torque ripple.

(8) winding mode of stator 11 is that being configured with of three-phase waveform winding is beneficial to the inhibition vibration.

(9) between bridge b=5.2 ° of angle Θ in the decline effect that fully causes the torque ripple rate and guarantee aspect the intensity between magnetic pole optimum.

Hereinafter will illustrate that the torque ripple rate is angular width A below 1 and the scope of angular width θ c than Rx/Ri according to Figure 22 A-Figure 24.

The figure of Figure 24 expresses use embodiment rotor 15 and makes the torque ripple rate under the angular width θ c situation of change more routine than the FEM parsing of the variation of Rx/Ri.The transverse axis of the chart of Figure 24 illustrates the value of angular width θ c, and the longitudinal axis illustrates the value of torque ripple rate than Rx/Ri.Stain in the chart is that FEM resolves the real data that obtains.

The data that real data Γ 1 (1) and real data group Γ 1 (2), Γ 1 (3), Γ 1 (4), Γ 1 (6), Γ 1 (10), Γ 1 (13) obtain for following condition in the chart of Figure 24:

With A=14 ° of this sequential angles width, 16 °, 18 °, 20 °, 24 °, 28 °, 32 ° condition,

Aforementioned shared condition, and

The ratio Dh/R of depth D h=0.7mm and radius R=0.028 (=0.7/R=0.7mm/25.5mm) condition.

The chart of Figure 23 A is the key diagram that is used for determining according to the chart of Figure 24 the proper range of angular width A and angular width θ c.Transverse axis illustrates angular width A among Figure 23 A, and the longitudinal axis illustrates angular width θ c.Only represent that with the real data group shown in the stain torque ripple rate among real data Γ 1 (1) and real data group Γ 1 (2), Γ 1 (3), Γ 1 (4), Γ 1 (6), Γ 1 (10), the Γ 1 (13) is a real data below 1 than Rx/Ri among Figure 23 A.Straight line J4 represent by depth D h and radius R ratio Dh/R=0.028 (=0.7/R) and the maximum Amax (4) of the angular width A that limits of straight line H (plane H).Maximum Amax (4) expression by than its little angular width A and ratio Dh/R=0.028 (=0.7/R) can form convex part 20, still by than its big angular width A and ratio Dh/R=0.028 (=0.7/R) can not form the upper limit of the angular width A of convex part 20.

Straight line α represents the upper limit by the angular width θ c of angular width A qualification.Also promptly, the upper limit of the angular width θ c that is expressed as follows of straight line α: the angular width θ c of the upper side range by comprising straight line α can not form convex part 20.Hereinafter straight line α is designated as upper limit line α.Upper limit line α is represented by following formula (3).

θc＝(60-A)°/2......(3)

The chart of Figure 22 A-22C and Figure 23 B-Figure 23 C be used for according to resolve by FEM obtain make torque ripple rate under the angular width θ c situation of change than the data of the variation of Rx/Ri (not shown, but by with the data of the data validation of the chart equivalence of Figure 24) decide the key diagram of the proper range of angular width A and angular width θ c.The chart of Figure 22 A is corresponding with the situation of depth D h=0.1mm, and the chart of Figure 22 B is corresponding with the situation of depth D h=0.3mm.The chart of Figure 22 C is corresponding with the situation of depth D h=0.5mm.The chart of Figure 23 B is corresponding with the situation of depth D h=1.0mm, and the chart of Figure 23 C is corresponding with the situation of depth D h=1.2mm.Radius R is 25.5mm.

Straight line J1 among Figure 22 A represent by depth D h and radius R ratio Dh/R=0.004 (=0.1/R) and the maximum Amax (1) of the angular width A that limits of straight line H (plane H).Straight line J2 among Figure 22 B represent by depth D h and radius R ratio Dh/R=0.012 (=0.3/R) and the maximum Amax (2) of the angular width A that limits of straight line H (plane H).Straight line J3 among Figure 22 C represent by depth D h and radius R ratio Dh/R=0.02 (=0.5/R) and the maximum Amax (3) of the angular width A that limits of straight line H (plane H).

Maximum Amax among Figure 22 A (1) expression by than its little angular width A and ratio Dh/R=0.004 (=0.1/R) can form convex part 20, still by than its big angular width A and ratio Dh/R=0.004 (=0.1/R) can not form the upper limit of the angular width A of convex part 20.Maximum Amax among Figure 22 B (2) expression by than its little angular width A and ratio Dh/R=0.006 (=0.3/R) can form convex part 20, still by than its big angular width A and ratio Dh/R=0.012 (=0.3/R) can not form the upper limit of the angular width A of convex part 20.Maximum Amax among Figure 22 C (3) expression by than its little angular width A and ratio Dh/R=0.02 (=0.5/R) can form convex part 20, still by than its big angular width A and ratio Dh/R=0.02 (=0.5/R) can not form the upper limit of the angular width A of convex part 20.

Maximum Amax among Figure 23 A (4) expression by than its little angular width A and ratio Dh/R=0.028 (=0.7/R) can form convex part 20, still by than its big angular width A and ratio Dh/R=0.028 (=0.7/R) can not form the upper limit of the angular width A of convex part 20.Maximum Amax among Figure 23 B (5) expression by than its little angular width A and ratio Dh/R=0.039 (=1/R) can form convex part 20, still by than its big angular width A and ratio Dh/R=0.039 (=1/R) can not form the upper limit of the angular width A of convex part 20.Maximum Amax among Figure 23 C (6) expression by than its little angular width A and ratio Dh/R=0.047 (=1.2/R) can form convex part 20, still by than its big angular width A and ratio Dh/R=0.047 (=1.2/R) can not form the upper limit of the angular width A of convex part 20.

Maximum Amax (1), Amax (2), Amax (3), Amax (4), Amax (5), Amax (6) are referred to as maximum Amax, and maximum Amax is represented by following formula (4).

Amax＝[60-2×arccos(1-Dh/R)]°......(4)

Maximum Amax ratio Dh/R=0.004 (=represent maximum Amax (1) 0.1/R) time, ratio Dh/R=0.012 (=represent maximum Amax (2) 0.3/R) time.Maximum Amax ratio Dh/R=0.02 (=represent maximum Amax (3) 0.5/R) time, ratio Dh/R=0.028 (=represent maximum Amax (4) 0.7/R) time.Maximum Amax ratio Dh/R=0.039 (=represent maximum Amax (5) 1/R) time, ratio Dh/R=0.047 (=represent maximum Amax (6) 1.2/R) time.

The ratio Dh/R=0.004 of straight line β 1 expression among Figure 22 A by depth D h and radius R (=0.1/R) and the lower limit of the angular width θ c of angular width A qualification.Also promptly, straight line β 1 is expressed as follows the lower limit of angular width θ c: can not form convex part 20 by angular width θ c in the underside area that comprises straight line β 1.Straight line ζ 1 shown in Figure 22 A is positioned at the upside of straight line β 1.

The ratio Dh/R=0.0126 of Figure 22 B cathetus β 2 expression by depth D h and radius R (=0.3/R) and the lower limit of the angular width θ c of angular width A qualification.Also promptly, straight line β 2 is expressed as follows the lower limit of angular width θ c: can not form convex part 20 by angular width θ c in the underside area that comprises straight line β 2.Straight line ζ 2 shown in Figure 22 B is positioned at the upside of straight line β 2.

The ratio Dh/R=0.02 of Figure 22 C cathetus β 3 expression depth D h and radius R (=0.5/R) and the lower limit of the angular width θ c of angular width A qualification.Also promptly, straight line β 3 is expressed as follows the lower limit of angular width θ c: can not form convex part 20 by angular width θ c in the underside area that comprises straight line β 3.Straight line ζ 3 shown in Figure 22 C is positioned at the upside of straight line β 3.

The ratio Dh/R=0.028 of Figure 23 A cathetus β 4 expression by depth D h and radius R (=0.7/R) and the lower limit of the angular width θ c of angular width A qualification.Also promptly, straight line β 4 is expressed as follows the lower limit of angular width θ c: can not form convex part 20 by angular width θ c in the underside area that comprises straight line β 4.Straight line ζ 4 shown in Figure 23 A is positioned at the upside of straight line β 4.

The ratio Dh/R=0.039 of Figure 23 B cathetus β 5 expression by depth D h and radius R (=1/R) and the lower limit of the angular width θ c of angular width A qualification.Also promptly, straight line β 5 is expressed as follows the lower limit of angular width θ c: can not form convex part 20 by angular width θ c in the underside area that comprises straight line β 5.Straight line ζ 5 shown in Figure 23 B is positioned at the upside of straight line β 5.

The ratio Dh/R=0.047 of Figure 23 C cathetus β 6 expression by depth D h and radius R (=1.2/R) and the lower limit of the angular width θ c of angular width A qualification.Also promptly, straight line β 6 is expressed as follows the lower limit of angular width θ c: can not form convex part 20 by angular width θ c in the underside area that comprises straight line β 6.Straight line ζ 6 shown in Figure 23 C is positioned at the upside of straight line β 6.

Hereinafter straight line β 1, β 2, β 3, β 4, β 5, β 6 are designated as lower limit line β 1, β 2, β 3, β 4, β 5, β 6.Lower limit line β 1, β 2, β 3, β 4, β 5, β 6 are represented by following formula (5).

θc＝[60-A-2×arccos(1-Dh/R)]°/2......(5)

Arccos (1-Dh/R) expression produces the angle σ of the cos σ of (1-Dh/R) value.Formula (5) ratio Dh/R=0.004 (=represent lower limit line β 1 0.1/R) time, ratio Dh/R=0.012 (=represent lower limit line β 2 0.3/R) time, ratio Dh/R=0.02 (=represent lower limit line β 3 0.5/R) time.Formula (5) ratio Dh/R=0.028 (=represent lower limit line β 4 0.7/R) time, ratio Dh/R=0.039 (=represent lower limit line β 5 1/R) time, ratio Dh/R=0.047 (=represent lower limit line β 6 1.2/R) time.

Straight line ζ 1, ζ 2, ζ 3, ζ 4, ζ 5, ζ 6 are represented by following formula (6).

θc＝[-0.5×A+(-14.1×Dh+26.7)]°......(6)

Formula (6) ratio Dh/R=0.004 (=represent straight line ζ 1 0.1/R) time, ratio Dh/R=0.012 (=represent straight line ζ 2 0.3/R) time, ratio Dh/R=0.02 (=represent straight line ζ 3 0.5/R) time.Formula (6) ratio Dh/R=0.028 (=represent straight line ζ 4 0.7/R) time, ratio Dh/R=0.039 (=represent straight line ζ 5 1/R) time, ratio Dh/R=0.047 (=represent straight line ζ 6 1.2/R) time.

In Figure 22 A, shown in hatched example areas, if limit ratio Dh/R=0.004 (=0.1/R) the angular width A under the situation in (zone of the side that keeps left on the right side and than straight line ε 1 than straight line δ o) between straight line δ o and the straight line ε 1, and (than upper limit line α by downside and than lower limit line β 1 zone by upside) predetermined angle width θ c between upper limit line α and lower limit line β 1, then the torque ripple rate is below 1 than Rx/Ri.

In Figure 22 B, shown in hatched example areas, if limit ratio Dh/R=0.012 (=0.3/R) the angular width A under the situation in (zone of the side that keeps left on the right side and than straight line ε 2 than straight line δ o) between straight line δ o and the straight line ε 2, and (than upper limit line α by downside and than lower limit line β 2 zone by upside) predetermined angle width θ c between upper limit line α and lower limit line β 2, then the torque ripple rate is below 1 than Rx/Ri.

In Figure 22 C, shown in hatched example areas, if limit ratio Dh/R=0.02 (=0.5/R) the angular width A under the situation in (zone of the side that keeps left on the right side and than straight line ε 3 than straight line δ o) between straight line δ o and the straight line ε 3, and (than upper limit line α by downside and than lower limit line β 3 zone by upside) predetermined angle width θ c between upper limit line α and lower limit line β 3, then the torque ripple rate is below 1 than Rx/Ri.

In having Figure 23 A of straight line z1, shown in hatched example areas, if limit ratio Dh/R=0.028 (=0.7/R) the angular width A under the situation in (zone of the side that keeps left on the right side and than straight line ε 4 than straight line δ o) between straight line δ o and the straight line ε 4, and (than upper limit line α by downside and than lower limit line β 4 zone by upside) predetermined angle width θ c between upper limit line α and lower limit line β 4, then the torque ripple rate is below 1 than Rx/Ri.Straight line zo is by following formula (7-1) expression, and straight line δ o is represented by following formula (7-2).

θc＝10° ......(7-1)

θc＝(2.5×A-30)°?......(7-2)

In having Figure 23 B of straight line zo, z1, shown in hatched example areas, if limit ratio Dh/R=0.039 (=1/R) the angular width A under the situation in (zone of the side that keeps left on the right side and than straight line J5 than straight line δ o) between straight line δ o and the straight line J5, and (lean on downside and comprise the zone of straight line ζ 6 at interior upside) predetermined angle width θ c between upper limit line α and straight line ζ 5 than upper limit line α, then the torque ripple rate is below 1 than Rx/Ri.Straight line z1 is by formula (8) expression of following table.

θc＝(-0.5×A+16)°......(8)

In having Figure 23 C of straight line zo, z1, shown in hatched example areas, if limit ratio Dh/R=0.047 (=1.2/R) the angular width A under the situation in (zone of the side that keeps left on the right side and than straight line J6 than straight line δ o) between straight line δ o and the straight line J6, and (lean on downside and comprise the zone of straight line ζ 6 at interior upside) predetermined angle width θ c between upper limit line α and straight line ζ 6 than upper limit line α, then the torque ripple rate is below 1 than Rx/Ri.

Among Figure 22 A-22C and Figure 23 A, the angle A (ε 1), A (ε 2), A (ε 3), the A (ε 4) that are represented by straight line ε 1, ε 2, ε 3, ε 4 are referred to as angle A (ε), and angle A (ε) is represented by following formula (9).

A(ε)＝[60-2×arccos(1-Dh/R)-(-18.9×Dh+12.7)]°＝[Amax-(-18.9×Dh+12.7)]° ......(9)

Angle A (ε) ratio Dh/R=0.004 (=represent angle A (ε 1) 0.1/R) time, ratio Dh/R=0.012 (=represent angle A (ε 2) 0.3/R) time, ratio Dh/R=0.02 (=represent angle A (ε 3) 0.5/R) time, ratio Dh/R=0.028 (=represent angle A (ε 4) 0.7/R) time.

Under the situation of angle A (ε) expression angle A (ε 4), (18.9 * Dh+12.7) become negative value, and (18.9 * Dh+12.7) value becomes bigger than Amax to Amax-.So, (18.9 * Dh+12.7) value is under the situation more than the Amax, and angular width A is less than Amax at Amax-.Also promptly, (18.9 * Dh+12.7) value surpasses under the Amax situation, and formula (9) and following formula (9-1) are replaced at Amax-.

A(ε)＝Amax ......(9-1)

Also promptly, if angular width A satisfies formula (10), and angular width θ c satisfies following formula (11), and the torque ripple rate is below 1 than Rx/Ri.

A≤[60-2×arccos(1-Dh/R)

-(-18.9×Dh+12.7)]°

＝[Amax-(-18.9×Dh+12.7)]°

And

A＜[60-2×arccos(1-Dh/R)]°＝Amax

...(10)

[60-A-2×arccos(1-Dh/R)]°/2

＝(Amax-A)°/2＜θc＜-(60-A)°/2...(11)

Comprehensive above formula (3)-(6), (7-1), (7-2), (8), (9), (9-1), (10), (11), if in the scope of following condition (1-0) expression in the set angle width A, set angle width θ c in the scope of following condition (2-0) expression, then the torque ripple rate can be for below 1 than Rx/Ri.

Condition (1-0):

A≤[60-2×arccos(1-Dh/R)

-(-18.9×Dh+12.7)]°

And A＜[60-2 * arccos (1-Dh/R)] °

Condition (2-0):

Angular width A satisfies in the following formula (i)-(iii) in the scope that aforementioned (1-0) formula is represented, all satisfy (iv)-(vi).

θc≤10°......(i)

θc≤(-0.5×A+16)° ......(ii)

θc≤(2.5×A-30)° ......(iii)

[60-A-2×arccos(1-Dh/R)]°/2＜θc......(iv)

[-0.5×A+(-14.1×Dh+26.7)]°≤θc......(v)

θc＜(60-A)°/2......(vi)

Condition (1-0), (2-0) are the situation of corresponding R=25.5mm and number of poles p=6, but at radius R is not that the situation of 25.5mm or number of poles p are not under 6 the situation, according to Dhr=Dh * 25.5/R, condition (1-0), (2-0) can expand to following conditions (1), (2), (ex1), (ex2).

Condition (1):

Ao≤[60-2×arccos(1-Dhr/25.5)

-(-18.9×Dhr+12.7)]°

And

Ao＜[60-2×arccos(1-Dhr/25.5)]°

Condition (2):

Angular width A satisfies in the following formula (i)-(iii) one in the scope that aforementioned (1) formula is represented, all satisfy (iv)-(vi).

θco≤10°......(i)

θco≤(-0.5×Ao+16)° ......(ii)

θco≤(2.5×Ao-30)° ......(iii)

[60-Ao-2×arccos(1-Dhr/25.5)]°/2＜θco......(iv)

[-0.5×Ao+(-14.1×Dhr+26.7)]°≤θco ......(v)

θco＜(60-Ao)°/2 ......(vi)

(ex1)：A＝Ao×6/p

(ex2)：θc＝θco×6/p

Under the situation of p ≠ 6, relatively according to condition (1), the angular width Ao of (2) setting, the scope of θ co, formula (ex1), (ex2) are for being used for the conversion formula of set angle width A and θ c.Also promptly, under the situation beyond the p=6, the Ao in condition (1), (2), θ co are replaced by A * p/6, θ c * p/6 according to formula (ex1), (ex2).Also promptly, use A, θ c to carry out the conversion of formula (ex1), (ex2) as the set angle width.

To illustrate in the scope of Figure 22 A-Figure 24 that hereinafter basic number of times (18 times) is formed the angular width A that compares with the situation of the 1st comparative example rotor 21 below 0.7 times and the scope of angular width θ c according to Figure 25-Figure 27.Use identical symbol with Figure 22, straight line that 23 situation is identical among Figure 26,27.

The figure of Figure 25 expresses use embodiment rotor 15 and makes the torque ripple rate under the angular width θ c situation of change more routine than the FEM parsing of the variation of Rx/Ri.Stain in the chart is for being resolved the real data that obtains by FEM.

The data that real data Γ 2 (2) and real data group Γ 2 (3), Γ 2 (4), Γ 2 (5), Γ 2 (6), Γ 2 (10), Γ 2 (12), Γ 2 (13) obtain for following condition in the chart of Figure 25:

With A=16 ° of this sequential angles width, 18 °, 20 °, 22 °, 24 °, 28 °, 30 °, 32 ° condition,

Aforementioned common condition, and

The ratio Dh/R=0.028 of depth D h=0.7mm and radius R (=0.7/R=0.7mm/25.5mm) condition.

The chart of Figure 27 A is the key diagram that is used for determining according to the chart of Figure 25 the proper range of angular width A and angular width θ c.Among Figure 27 A with the real data group shown in the stain only represent among real data Γ 2 (2) and real data group Γ 2 (3), Γ 2 (4), Γ 2 (5), Γ 2 (6), Γ 2 (10), Γ 2 (12), the Γ 2 (13), basic number of times (18 times) is formed and the situation of the 1st comparative example rotor 21 is in a ratio of real data below 0.7 times.Straight line x4, y4, z2 are expressed as follows the straight line of setting: it is used to limit, and basic number of times (18 times) is formed and the situation of the 1st comparative example rotor 21 is in a ratio of below 0.7 times.

The chart of Figure 26 A-26C, Figure 27 B and Figure 27 C be used for according to resolve by FEM obtain make under the angular width θ c situation of change the torque ripple rate than the data of the variation of Rx/Ri (not shown, but by with the data of the data validation of the chart equivalence of Figure 25) decide the key diagram of the proper range of angular width A and angular width θ c.The chart of Figure 26 A is corresponding with the situation of depth D h=0.1mm, and the chart of Figure 26 B is corresponding with the situation of depth D h=0.3mm.The chart of Figure 26 C is corresponding with the situation of depth D h=0.5mm.The chart of Figure 27 B is corresponding with the situation of depth D h=1.0mm, and the chart of Figure 27 C is corresponding with the situation of depth D h=1.2mm.Radius R is 25.5mm.

Straight line x1, y1 shown in Figure 26 A, straight line x1, y1 shown in Figure 26 B, straight line x1, y3 shown in Figure 26 C, the straight line y6 shown in straight line x5, the y5 shown in Figure 27 B and Figure 27 C is the straight line of following setting: it is used to limit, and basic number of times (18 times) is formed and the situation of the 1st comparative example rotor 21 is in a ratio of below 0.7 times.Figure 26 A-Figure 26 C and Figure 27 A-Figure 27 C bend zone are that the situation of basic number of times (18 times) composition and the 1st comparative example rotor 21 is in a ratio of the zone below 0.7 times.

Straight line x1 is represented by following formula (12).

A=22 ° (situation of Dh≤0.5) ... (12)

Straight line x4 is represented by following formula (13).

A=(21.4 * Dh+32.8) ° (situation of 0.5＜Dh≤0.8) ... (13)

Straight line x5 is represented by following formula (14).

A=(38.75 * Dh+46.5) ° (situation of 0.8＜Dh) ... (14)

Straight line y1, y2, y3, y4 are represented by following formula (15).

A=(10 * Dh+37) ° (situation of Dh≤0.8) ... (15)

Straight line y5, y6 are represented by following formula (16).

A=(27.5 * Dh+51) ° (situation of 0.8＜Dh) ... (16)

Straight line z2, z3, z4 are represented by following formula (17).

θc＝[(-2.5×Dh+2.5)×(A-16)+10]° ......(17)

During comprehensive above formula (12)-(17), if in the scope of following condition (1-1-0) expression in the set angle width A, set angle width θ c in the scope of following condition (2-1-0) expression, then comparing basic number of times (18 times) composition with the situation of the 1st comparative example rotor 21 can be for below 0.7 times.

Condition (1-1-0):

In the scope of Dh≤1.2mm,

22 °≤A≤(10 * Dh+37) ° (situation of Dh≤0.5)

(21.4 * Dh+32.8) °≤A≤(10 * Dh+37) ° (situation of 0.5＜Dh≤0.8)

(38.75 * Dh+46.5) °≤A≤(27.5 * Dh+51) ° (situation of 0.8＜Dh)

Condition (2-1-0):

Satisfy aforementioned condition (2-0) and satisfy following formula (vii).

θc≤[(-2.5×Dh+2.5)×(A-16)+10]° ......(vii)

Condition (1-1-0), (2-1-0) are the situation of corresponding R=25.5mm and number of poles p=6, but at radius R is not that the situation of 25.5mm or number of poles p are not under 6 the situation, according to Dhr=Dh * 25.5/R, condition (1-1-0), (2-1-0) can expand to following conditions (1-1), (2-1), (ex1), (ex2).

Condition (1-1):

In the scope of Dhr≤12

22 °≤Ao≤(10 * Dhr+37) ° (situation of Dhr≤0.5)

(21.4 * Dhr+32.8) °≤Ao≤(10 * Dhr+37) ° (situation of 0.5＜Dhr≤0.8)

(38.75 * Dhr+46.5) °≤Ao≤(27.5 * Dhr+51) ° (situation of 0.8＜Dhr)

Condition (2-1):

Satisfy aforementioned condition (2) and satisfy following formula (vii).

θco≤[(-2.5×Dhr+2.5)×(Ao-16°)+10]°......(vii)

Under the situation of p ≠ 6, relatively according to condition (1-1), the angular width Ao of (2-1) setting, the scope of θ co, formula (ex1), (ex2) are for being used for the conversion formula of set angle width A and θ c.Also promptly, under the situation beyond the p=6, the Ao among condition (1-1), (2-1), θ co are replaced by A * p/6, θ c * p/6 according to formula (ex1), (ex2).Also promptly, use A, θ c to carry out the conversion of formula (ex1), (ex2) as the set angle width.

Hereinafter will illustrate that size that basic number of times in the torque ripple of output torque (for example 6 utmost points, 18 slits, 18 times) is formed is that the number of times (for example 6 utmost points, 18 slits, 36 times) of the multiple of basic number of times is formed following angular width A and the scope of angular width θ c according to Figure 28 and Figure 29.Use identical symbol with Figure 26, straight line that 27 situation is identical among Figure 28.

The figure of Figure 29 express use embodiment rotor 15 and make 18 times of torque ripple under the angular width θ c situation of change form in the torque ripple rate form than Rx/Ri and torque ripple 36 times in the torque ripple rate resolve example than the FEM of the variation of the difference of Rx/Ri.Stain in the chart is for being resolved the real data that obtains by FEM.

The data that real data group Γ 3 (7), Γ 3 (8), Γ 3 (9), Γ 3 (10), Γ 3 (11), Γ 3 (12) obtain for following condition in the chart of Figure 29:

With A=25 ° of this sequential angles width, 26 °, 27 °, 28 °, 29 °, 30 ° condition,

Aforementioned common condition, and

The ratio Dh/R=0.02 of depth D h=0.5mm and radius R (=0.5/R=0.5mm/25.5mm) condition.

The chart of Figure 28 C is the key diagram that is used for determining according to the chart of Figure 29 the proper range of angular width A and angular width θ c.The torque ripple rate is the torque ripple rate real data littler than Rx/Ri during 36 times of torque ripple are formed than Rx/Ri in only representing to form for 18 times of torque ripples among real data group Γ 3 (7), Γ 3 (8), Γ 3 (9), Γ 3 (10), Γ 3 (11), the Γ 3 (12) with the real data group shown in the stain among Figure 28 C.Straight line w31, w32, w33, w34 are the straight line of following setting: the size that its basic number of times (18 times) of torque ripple that is used for limiting output torque is formed is less than the size of forming for 36 times.

The chart of Figure 28 A and Figure 28 B be used for according to resolve by FEM 18 times of obtaining torque ripple form the torque ripple rate form than Rx/Ri and torque ripple 36 times in the torque ripple rate than the data of the variation of the difference of Rx/Ri (not shown, but by with the data of the data validation of the chart equivalence of Figure 29) decide the key diagram of the proper range of angular width A and angular width θ c.The chart of Figure 28 A is corresponding with the situation of depth D h=0.1mm, and the chart of Figure 28 B is corresponding with the situation of depth D h=0.3mm.Radius R is 25.5mm.

Figure 28 A cathetus w11, w12, w13, w14 are the straight line of following setting: the size that its basic number of times of torque ripple (18 times form) that is used for limiting output torque is formed is less than being the size of forming for 36 times.Figure 28 B cathetus w21, w22, w23, w24 are the straight line of following setting: the size that its basic number of times of torque ripple (18 times form) that is used for limiting output torque is formed is less than being the size of forming for 36 times.Figure 28 A-Figure 28 C bend zone for 18 times are formed in the torque ripple of output torque size less than the zone that is the size formed for 36 times.

Straight line w11, w21, w31 are represented by following formula (18).

A＝(-2.5×Dh+27.25)° ......(18)

Straight line w12, w22, w32 are represented by following formula (19).

A＝(-2.5×Dh+30.25)° ......(19)

Straight line w13, w23, w33 are represented by following formula (20).

θc＝(-12.5×Dh+18.25)°......(20)

Straight line w14, w24, w34 are represented by following formula (21).

θc＝(-12.5×Dh+1525)°......(21)

Comprehensive above formula (18)-(21), if in the scope of following condition (1-2-0) expression in the set angle width A, set angle width θ c in the scope of following condition (2-2-0) expression, then can the torque ripple of output torque in the size formed of basic number of times (for example 6 utmost points, 18 slits, 18 times) less than number of times (for example 6 utmost points, 18 slits, the 36 times) composition that be the multiple of basic number of times.

Condition (1-2-0):

In the scope of Dh≤0.5mm,

(-2.5×Dh+27.25)°≤A≤(-2.5×Dh+30.25)°

Condition (2-2-0):

(-12.5×Dh+15.25)°≤θc≤(-12.5×Dh+18.25)°

And

θc＜(60-A)°/2

Condition (1-2-0), (2-2-0) are the situation of corresponding R=25.5mm and number of poles p=6, but at radius R is not that the situation of 25.5mm or number of poles p are not under 6 the situation, according to Dhr=Dh * 25.5/R, condition (1-2-0), (2-2-0) can expand to following conditions (1-2), (2-2), (ex1), (ex2).

Condition (1-2):

In the scope of Dhr≤0.5

(-2.5×Dhr+27.25)°≤Ao≤(-2.5×Dhr+30.25)°

Condition (2-2):

(-12.5×Dhr+15.25)°≤θco≤(-12.5×Dhr+18.25)°

And

θco＜(60-Ao)°/2

Under the situation of p ≠ 6, relatively according to condition (1-2), the angular width Ao of (2-2) setting, the scope of θ co, formula (ex1), (ex2) are for being used for the conversion formula of set angle width A and θ c.Also promptly, under the situation beyond the p=6, the Ao among condition (1-2), (2-2), θ co are replaced by A * p/6, θ c * p/6 according to formula (ex1), (ex2).Also promptly, use A, θ c to carry out the conversion of formula (ex1), (ex2) as the set angle width.

The 2nd embodiment of the present invention shown in Figure 30 A-30C hereinafter will be described.Partly use same-sign with the 1st embodiment identical construction.

Among the 2nd embodiment, adjacent straight line H1 is connected by the convex curve ψ that the radial outside towards embodiment rotor 15 protrudes with H2, and adjacent straight line H1 is connected by the convex curve ψ that the radial outside towards embodiment rotor 15 protrudes with H3.In the present embodiment, convex curve ψ is that radius is the part of the following round ψ o of imaginary maximum difference Dmax.

Adjacent a pair of straight line H1, H2 connected by convex curve ψ, and adjacent a pair of straight line H1, H3 helped to make in the magnetic flux change of the outer peripheral face of embodiment rotor 15 level and smooth by being configured with of connecting of convex curve ψ, and suppresses torque ripple.

Above-mentioned each embodiment can carry out following change.

(1) shape of convex part 20 also can be to connect the convex polygon shape that the plane more than 4 forms.

(2) sum of permanent magnet 17A, 17B also can be a plurality of beyond 6.

Electric rotating machines such as (3) 4 utmost points 12 slits, 6 utmost points, 27 slits, 8 utmost points, 24 slits also are applicable to the present invention, also obtain same effect under these situations.

(4) winding mode of stator 15 also can be a distributed winding, also obtains same effect under this situation.

The concentrated winding electric rotating machine of (5) 6 utmost points 9 slits etc. also is applicable to the present invention, also obtains same effect under this situation.

(6) polarity for permanent magnets adjacent 17A, 17B is N-N-S-S-N-N-S-S-......, and the electric rotating machine of having equipped the pair of permanent magnets 17A, the 17B that embed with V-shape and many rotors 15 to permanent magnet 17A, 17B also is applicable to the present invention.

(7) as shown in figure 31, sealed electrical compressor 30 also is applicable to the present invention.Motor compressor 30 is the Scroll-type motor compressor, and electric rotating machine M is as the air conditioner for vehicles motor.The embodiment rotor 15 of electric rotating machine M is fixed on the rotating shaft 32, and the stator 11 of electric rotating machine M is fixing in the inner peripheral surface of motor shell 35.The movable spool 31 of motor compressor 30 rotates (compression movement) by the rotation of the rotating shaft 32 of electric rotating machine M.By this, as the movable spool 31 of compression movement body and fixedly 34 volumes of the discharge chambe between the spool 33 reduce.Suck in the discharge chambes 34 via inhalation port 36 from not shown external refrigeration medium loop and the coolants that import in the motor shell 35.Coolant in the discharge chambe 34 is discharged from ejection chamber 39 via ejection port 37 by dump valve 38.Coolant in the ejection chamber 39 flows out to the external refrigeration medium loop, after this is back in the motor shell 35.In addition, hermetic type compressor means at airtight electric rotating machine M in the one-piece type container of compressor 30 welding.Such compressor is by the moving fluid cool motors.

Low pulsation (low vibration) the good electric rotating machine M of the present invention in aspect is applicable to sealed electrical compressor 30.Promptly, in vehicle-mounted sealed electrical compressor, be strict with and reduce noise and vibration, but the mean value of output torque does not descend yet.Permanent magnet buried type electric rotating machine M is fit to this requirement.

Therefore, though only put down in writing a plurality of embodiment, those skilled in the art will be appreciated that without departing from the spirit and scope of the present invention can implement other specific embodiment.The present invention is not limited to the content of record herein, also can improve in additional request scope.

Claims (22)

1, a kind of electric rotating machine, it is equipped with:

Ring-type stator (11), this stator (11) have a plurality of teeth (121) of arranging along interior week of this stator (11), form slit between the tooth of adjacency,

The coil (13) that in aforementioned slots (122), is provided with,

By stator former (11) around rotor (15),

A plurality of permanent magnets (17A, 17B) of burying underground in this rotor (15) inside, each permanent magnet (17A, 17B) have pole center part (173),

At a plurality of circumferential sections (19A, 19B) that are provided with in a plurality of parts of the periphery of corresponding aforementioned rotor (15) respectively with a plurality of aforementioned pole centers parts (173), each circumferential section (19A, 19B) is the part with the concentric imaginary circle side face (E) of the pivot axis (C) of aforementioned rotor (15), aforementioned a plurality of circumferential section (19A, 19B) leaves in a circumferential direction mutually

A plurality of convex parts (20), each convex part (20) connects each adjacent a pair of aforementioned circumferential section (19A, 19B), each convex part (20) is positioned at than aforementioned imaginary circle side face (E) radially in the inner part the position, protrude towards radial outside simultaneously, each convex part (20) has a plurality of bights (H11, H12) of protruding towards radial outside.

2, electric rotating machine as claimed in claim 1 wherein, in the cross sectional view vertical with aforementioned pivot axis (C), limits aforementioned each convex part (20) by interconnective a plurality of straight lines (H1, H2, H3).

3, electric rotating machine as claimed in claim 2, wherein, the number of the aforementioned corner (H11, H12) that each convex part (20) has is 2, limits aforementioned convex part (20) by 3 straight lines (H1, H2, H3) that connect.

4, electric rotating machine as claimed in claim 3, wherein, aforementioned 2 bights (H11, H12) are with respect to aforementioned convex part (20) 2 bisectors (154) the mirror image symmetry of 2 five equilibriums in a circumferential direction.

5, electric rotating machine as claimed in claim 4, wherein, aforementioned 3 straight lines (H1, H2, H3) in the middle of comprising straight line (H2) and across 2 straight lines (H1, H3) of the both sides of the straight line (H2) of this centre,

The straight line of aforementioned both sides (H1, H3) length separately is longer from the extended line (H21, H31) that aforementioned corner (H11, H12) extends to till the aforementioned imaginary circle side face (E) respectively than the straight line (H1, H3) of aforementioned both sides.

6, electric rotating machine as claimed in claim 3, wherein,

The straight line (H1, H3) of both sides is with respect to aforementioned convex part (20) 2 bisectors (154) the mirror image symmetry of 2 five equilibriums in a circumferential direction in aforementioned 3 straight lines (H1, H2, H3),

With aforementioned rotary middle spindle line (C) is the aforementioned circumferential section (19A at center, angular width 19B) is A, the number of poles of aforementioned electric rotating machine is p, straight line (the H1 of aforementioned both sides, H3) two ends that have respectively (H11 and 192, H12 and 193) be that the angular width at center is θ c with aforementioned rotary middle spindle line (C), aforementioned circumferential section (19A, radius 19B) is R, the minimum range between aforementioned convex part (20) and the aforementioned pivot axis (C) and the difference of radius R are depth D h, during Dhr=Dh * 25.5/R

Angular width A sets in satisfying following condition (1) and scope (ex1),

Angular width θ c sets in satisfying following condition (2), (ex1) and scope (ex2),

Condition (1):

Ao≤[60-2×arccos(1-Dhr/25.5)-(-18.9×Dhr+12.7)]°

And

Ao＜[60-2×arccos(1-Dhr/25.5)]°

Condition (2):

Angular width A satisfies in the following formula (i)-(iii) in the scope of aforementioned condition (1) expression, satisfy all (iv)-(vi) portion,

θco≤10°......(i)

θco≤(-0.5×Ao+16)°......(ii)

θco≤(2.5×Ao-30)°......(iii)

[60-Ao-2×arccos(1-Dhr/25.5)]°/2＜θco......(iv)

[-0.5×Ao+(-14.1×Dhr+26.7)]°≤θco......(v)

θco＜(60-Ao)°/2......(vi)

(ex1)：A＝Ao×6/p

(ex2)：θc＝θco×6/p。

7, electric rotating machine as claimed in claim 6, wherein,

In aforementioned 3 straight lines (H1, H2, H3) straight line (H1, H3) of both sides with aforementioned convex (20) relevant mirror image symmetry of 2 bisectors (154) of 2 five equilibriums in a circumferential direction partly,

Angular width A sets in satisfying following condition (1-1) and scope (ex1),

Angular width θ c sets in satisfying following condition (2-1), (ex1) and scope (ex2),

Condition (1-1):

In the scope of Dhr≤1.2,

Under the situation of Dhr≤0.5,22 °≤Ao≤(10 * Dhr+37) °,

Under the situation of 0.5＜Dhr≤0.8, (21.4 * Dhr+32.8) °≤Ao≤(10 * Dhr+37) °,

Under the situation of 0.8＜Dhr, (38.75 * Dhr+46.5) °≤Ao≤(27.5 * Dhr+51) °,

Condition (2-1):

Angular width A satisfies aforementioned condition (2) and satisfies following formula (vii), in the scope that aforementioned (1-1) formula is represented

θco≤[(-2.5×Dhr+2.5)×(Ao-16°)+10]°......(vii)

(ex1)：A＝Ao×6/p

(ex2)：θc＝θco×6/p。

8, electric rotating machine as claimed in claim 3, wherein,

The straight line (H1, H3) of both sides is with respect to aforementioned convex part (20) the relevant mirror image symmetry of 2 bisectors (154) of 2 five equilibriums in a circumferential direction in aforementioned 3 straight lines (H1, H2, H3),

With aforementioned rotary middle spindle line (C) is the aforementioned circumferential section (19A at center, angular width 19B) is A, the number of poles of aforementioned electric rotating machine is p, straight line (the H1 of aforementioned both sides, H3) two ends that have respectively (H11 and 192, H12 and 193) be that the angular width at center is θ c with aforementioned rotary middle spindle line (C), aforementioned circumferential section (19A, radius 19B) is R, the minimum range between aforementioned convex part (20) and the aforementioned pivot axis (C) and the difference of radius R are depth D h, during Dhr=Dh * 25.5/R

Angular width A sets in satisfying following condition (1-2) and scope (ex1),

Angular width θ c sets in satisfying following condition (2-2), (ex1) and scope (ex2),

Condition (1-2):

In the scope of Dhr≤0.5

(-2.5×Dhr+27.25)°≤Ao≤(-2.5×Dhr+30.25)°

Condition (2-2):

(-12.5×Dhr+15.25)°≤θco≤(-12.5×Dhr+18.25)°

And

θco＜(60-Ao)°/2

(ex1)：A＝Ao×6/p

(ex2)：θc＝θco×6/p。

9, as each described electric rotating machine in the claim 3 to 8, wherein,

Aforementioned a plurality of permanent magnet (17A, 17B) is contained in respectively in a plurality of accommodation holes (162) that aforementioned rotor (15) has,

Distinguish in the adjacent a pair of aforementioned accommodation hole (162) in one the differentiation wall the 1st point (165) with the interval minimum of aforementioned convex part (20), and distinguish in the differentiation wall of another accepting hole the 2nd point (166) with the interval minimum of aforementioned convex part (20), be that maximum angular width is angle Θ b between bridge in the angular width at center with aforementioned rotary middle spindle line (C)

Angle Θ b sets with the scope of 0＜Θ b≤10 ° between aforementioned bridge.

10, electric rotating machine as claimed in claim 9, wherein, angle Θ b is 5.2 ° between aforementioned bridge.

11, as each described electric rotating machine in the claim 3 to 8, wherein,

Aforementioned corner (H11, H12) is to connect convex curve (ψ) adjacent a pair of aforementioned straight line (H1 and H2, H2 and H3), that protrude towards the radial outside of aforementioned rotor (15).

12, as each described electric rotating machine in the claim 1 to 8, wherein,

Aforementioned a plurality of permanent magnet (17A, 17B) is arranged to alternating polarity difference in a circumferential direction.

13, as each described electric rotating machine in the claim 1 to 8, wherein,

Be provided with to aforementioned a plurality of circumferential section (19A, 19B) equal angles spacing.

14, as each described electric rotating machine in the claim 1 to 8, wherein,

Pore size between the periphery of aforementioned tooth (121) and aforementioned rotor (15) is and is positioned at the corresponding space of magnetic pole switching part (164) (G) maximum between the adjacent a pair of aforementioned permanent magnet (17A, 17B).

15, as each described electric rotating machine in the claim 1 to 8, wherein,

Aforementioned coil (13) is gone up waveform in stator former (11) and is reeled.

16, as each described electric rotating machine in the claim 1 to 8, wherein,

The number of poles of aforementioned electric rotating machine (p) is set at 6.

17, as each described electric rotating machine in the claim 1 to 8, wherein,

Aforementioned slots number (K) is set at 18.

18, as each described electric rotating machine in the claim 1 to 8, wherein,

Aforementioned convex part (20) constitutes, and the size that makes basic number of times in the output torque of electric rotating machine form is below the composition of number of times of multiple of basic number of times.

19, as each described electric rotating machine in the claim 1 to 8, wherein,

Aforementioned permanent magnet (17A, 17B) has the vertical writing board shape of radius with aforementioned rotor (15).

20, as each described electric rotating machine in the claim 1 to 8, wherein,

The interval of each and aforementioned pivot axis (C) is equidistant in aforementioned a plurality of permanent magnet (17A, 17B).

21, as each described electric rotating machine in the claim 1 to 8, wherein, aforementioned electric rotating machine uses with motor (M) as air conditioner for vehicles.

22, a kind of sealed electrical compressor (30), it is equipped with:

Air conditioner for vehicles as claimed in claim 21 motor (M),

By the rotating shaft (32) of aforementioned motor (M) rotation,

Compression movement body (31) according to the rotation of aforementioned rotating shaft (32) the gas compression ejection that discharge chambe (34) is interior.

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