JP2005323498A - Permanent magnet type dynamo-electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a permanent magnet type dynamo-electric machine capable of attaining stable driving even when the dynamo-electric machine using a concentrated winding stator and a magnet imbedded type rotor is driven by a position sensorless 120° excitation inverter. <P>SOLUTION: This permanent magnet type dynamo-electric machine has the stator 6 around which a concentrated winding type armature winding 5 is wound so as to surround the plurality of teeth 3 formed at a stator core 2, and the rotor 7 in which the permanent magnet 10 is accommodated in a plurality of permanent magnet insertion holes 9 formed at a rotor core 8. The permanent magnet 10 is formed into a protruding V shape relative to a shaft of the rotor 7, a roughly V-shaped recess portion 13 is formed between poles at an outer periphery surface of the rotor core 8, an angle which is formed by both intersections between the rotor outer periphery surface and the roughly V-shaped recess portion relative to the rotor shaft is taken as θ2, and θ2/θ4 becomes ≥66.7% or ≤85.7% when the value of 360°/the number of poles is taken as θ4. Torque by magnet flux is increased, and armature reaction flux generated by the armature current is deceased, therefore, abscissa inductance is decreased, thus promptly commutating the armature current. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a permanent magnet type rotating electric machine, and more particularly to a permanent magnet type rotating electric machine mounted on a compressor of an air conditioner.

  Conventionally, permanent magnets of various shapes are employed in this type of permanent magnet type rotating electrical machine. As an example, permanent magnets are provided in a stator having concentrated winding armature windings so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. 2. Description of the Related Art There is a permanent magnet type rotating electrical machine that has a housed rotor and uses a reluctance torque to increase the output of the rotating electrical machine (see, for example, Patent Document 1).

JP-A-6-339241 (pages 3-4)

  In the above prior art, a permanent magnet is provided in a stator having concentrated winding armature windings so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. And the efficiency of rotary electricity can be improved by using the reluctance torque effectively.

  However, due to the concentrated winding, the effective range of the induced voltage is narrowed, and when the rotating electrical machine is driven by the position sensorless 120-degree energizing inverter using the induced voltage, the position sensor signal due to the induced voltage cannot be obtained and operation is impossible. There is a problem to become.

  An object of the present invention is to provide a permanent magnet type rotating electrical machine that can be stably driven even if a rotating electrical machine using a concentrated winding stator and a magnet embedded rotor is driven by a position sensorless 120-degree energizing inverter. .

  To achieve the above object, the present invention provides a stator having concentrated winding armature windings so as to surround a plurality of teeth formed on a stator core, and a plurality of coils formed on a rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a permanent magnet is housed in a permanent magnet insertion hole, the permanent magnet is formed in a V-shape or U-shape that is convex with respect to the rotor shaft, and the outer peripheral surface of the rotor core A permanent magnet type rotating electrical machine in which a substantially V-shaped recess is formed between poles is proposed.

  The present invention also provides a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a magnet is housed, the permanent magnet has a V-shape or U-shape that is convex with respect to the rotor axis, and is substantially V-shaped between the outer peripheral surfaces of the rotor core. A permanent magnet type rotating electrical machine is proposed in which a concave portion having a shape is formed and a plurality of slits extending in the radial direction of the rotor are formed in a rotor core on the outer peripheral side of the permanent magnet.

  The present invention further provides a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a magnet is housed, a slit extending in the radial direction of the rotor is formed at the center of the teeth of the stator core, and the permanent magnet is convex with respect to the rotor axis. Proposed is a permanent magnet type rotating electrical machine that is V-shaped or U-shaped and has a substantially V-shaped recess formed between the outer peripheral surfaces of the rotor core.

  The present invention relates to a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in a stator core, and permanent magnets in a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor accommodated therein, a slit extending in the radial direction of the rotor is formed in the center portion of the teeth of the stator core, and the permanent magnet is formed in a V shape that is convex with respect to the rotor axis. Alternatively, it is U-shaped, a substantially V-shaped recess is formed between the outer peripheral surfaces of the rotor core, and a plurality of slits extending in the radial direction of the rotor are formed in the rotor core on the outer peripheral side of the permanent magnet. A permanent magnet type rotating electrical machine is proposed.

  To achieve the above object, the present invention provides a stator having concentrated winding armature windings so as to surround a plurality of teeth formed on a stator core, and a plurality of coils formed on a rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a permanent magnet is housed in a permanent magnet insertion hole, the permanent magnet is formed in a V-shape or U-shape that is convex with respect to the rotor shaft, and the outer peripheral surface of the rotor core A permanent magnet type rotating electrical machine in which a plurality of substantially V-shaped concave portions are formed between poles is proposed.

  The present invention also provides a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a magnet is housed, the permanent magnet has a V-shape or U-shape that is convex with respect to the rotor axis, and is substantially V-shaped between the outer peripheral surfaces of the rotor core. A permanent magnet type rotating electric machine is proposed in which a plurality of concave portions are formed and a plurality of slits extending in the radial direction of the rotor are formed in a rotor core on the outer peripheral side of the permanent magnet.

  The present invention further provides a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a magnet is housed, the permanent magnet has a V-shape or U-shape that is convex with respect to the rotor axis, and is substantially U-shaped between the outer peripheral surfaces of the rotor core. A permanent magnet type rotating electrical machine in which a plurality of concave portions are formed is proposed.

  The present invention relates to a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in a stator core, and permanent magnets in a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a housed rotor, the permanent magnet has a V-shape or U-shape that is convex with respect to the rotor axis, and has a substantially U-shape between the outer peripheral surfaces of the rotor core. A permanent magnet type rotating electrical machine is proposed in which a plurality of recesses are formed and a plurality of slits extending in the radial direction of the rotor are formed in the rotor core on the outer peripheral side of the permanent magnet.

  To achieve the above object, the present invention provides a stator having concentrated winding armature windings so as to surround a plurality of teeth formed on a stator core, and a plurality of coils formed on a rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a permanent magnet is housed in a permanent magnet insertion hole, a slit extending in the radial direction of the rotor is formed at the center of the teeth of the stator core, and the permanent magnet is attached to the rotor. A permanent magnet type rotating electrical machine is proposed in which a V-shaped or U-shaped convex with respect to the shaft is formed and a plurality of substantially V-shaped concave portions are formed between the outer peripheral surfaces of the rotor core.

  The present invention also provides a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a magnet is housed, a slit extending in the radial direction of the rotor is formed at the center of the teeth of the stator core, and the permanent magnet is convex with respect to the rotor axis. V-shaped or U-shaped, a plurality of substantially V-shaped recesses are formed between the outer peripheral surfaces of the rotor core, and a plurality of cores extending in the radial direction of the rotor are formed on the rotor core on the outer peripheral side of the permanent magnet. We propose a permanent magnet type rotating electrical machine with slits.

  The present invention further provides a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in the stator core, and a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor in which a magnet is housed, a slit extending in the radial direction of the rotor is formed at the center of the teeth of the stator core, and the permanent magnet is convex with respect to the rotor axis. A permanent magnet type rotating electrical machine is proposed which is V-shaped or U-shaped and has a plurality of substantially U-shaped recesses between the outer peripheral surfaces of the rotor core.

  The present invention relates to a stator in which concentrated winding armature winding is provided so as to surround a plurality of teeth formed in a stator core, and permanent magnets in a plurality of permanent magnet insertion holes formed in the rotor core. In a permanent magnet type rotating electrical machine having a rotor accommodated therein, a slit extending in the radial direction of the rotor is formed in the center portion of the teeth of the stator core, and the permanent magnet is formed in a V shape that is convex with respect to the rotor axis. Alternatively, it is U-shaped, a plurality of substantially U-shaped recesses are formed between the outer peripheral surfaces of the rotor core, and a plurality of slits extending in the radial direction of the rotor are formed on the rotor core on the outer peripheral side of the permanent magnet. The formed permanent magnet type rotating electrical machine is proposed.

  A convex iron core is arranged between a plurality of substantially V-shaped or substantially U-shaped concave portions formed on the outer circumferential surface of the rotor, and the width of the innermost circumferential side of the convex iron core is set to the outermost circumferential side of the permanent magnet insertion hole. It can also be larger than the circumferential distance.

  In any one of the above permanent magnet type rotating electrical machines, the angle formed by the intersection of the rotor outer peripheral surface and the substantially V-shaped or substantially U-shaped recess with the rotor shaft is θ2, and the value is 360 degrees / pole number. When θ4 is θ4, θ2 / θ4 is preferably 66.7% or more and 85.7% or less.

  When driven by a position sensorless 120-degree energizing inverter, the induced voltage of the rotating electrical machine is detected to detect the position. That is, an induced voltage appears between the terminals of the rotating electrical machine in the non-energized section of 30 degrees with respect to the energized section of 120 degrees, and the position is detected from the zero cross point.

  An armature current flows through the winding, and it is necessary to commutate in a 30-degree section. However, the concentrated winding itself has a large inductance and a narrow induced voltage range, so that the armature current cannot be reduced quickly.

  As a countermeasure, it is considered that the inductance of the winding should be reduced.

  However, since the leakage inductance of the winding itself is specified from the structure and the size is small, the inductance generated based on the coupling between the rotor core shape called the horizontal axis inductance and the armature winding is reduced. It may be reduced.

  The present invention is based on this policy, and the permanent magnet is formed in a V shape that is convex with respect to the rotor axis, and a substantially V-shaped recess is formed between the outer peripheral surfaces of the rotor core. The leakage flux of the permanent magnet is reduced, the torque due to the magnet flux is increased, and the armature reaction magnetic flux generated by the armature current is reduced.

  Therefore, the horizontal axis inductance is reduced, the armature current can be quickly commutated, and a permanent magnet type rotating electrical machine that can be driven stably even if driven by the position sensorless 120-degree conduction inverter is obtained.

  According to the present invention, the permanent magnet has a U-shape or a V-shape that is convex with respect to the rotor axis, a substantially V-shaped recess is formed between the outer peripheral surfaces of the rotor core, and the torque generated by the magnetic flux Furthermore, since the armature reaction magnetic flux generated by the armature current is reduced, the horizontal axis inductance is reduced, the armature current is quickly commutated, and driven by a position sensorless 120-degree conduction inverter. A permanent magnet type rotating electrical machine that can be driven stably is obtained.

  Next, with reference to FIGS. 1-10, embodiment of the permanent-magnet-type rotary electric machine by this invention is described.

Embodiment 1

  FIG. 1 is a cross-sectional view showing a radial cross-sectional shape of a first embodiment of a permanent magnet type rotating electrical machine according to the present invention. In the first embodiment, the stator 6 of the permanent magnet type rotating electrical machine 1 includes a stator core 2 and armature windings 5 wound in a plurality of slots 4 formed together with teeth 3 of the stator core 2. It consists of The armature winding 5 includes concentrated windings of a U-phase winding 5A, a V-phase winding 5B, and a W-phase winding 5C. A rotor 7 of the permanent magnet type rotating electrical machine 1 includes a rotor core 8 and a permanent magnet 10 housed in a V-shaped permanent magnet insertion hole 9 formed in the rotor core 8. A shaft fitting hole 11 for fitting a shaft (not shown) is formed in the rotor core 8. In addition, the permanent magnet 10 in the case of this Embodiment 1 is 4 poles.

  FIG. 2 is a cross-sectional view showing the radial cross-sectional shape of the rotor by enlarging the rotor 7 of FIG. 1. In FIG. 2, the rotor 7 has a rivet hole 12 for fixing the rotor core 8 and a V-shaped recess 13 between the V-shaped permanent magnet 10.

  The angle formed by the intersection of the outer peripheral surface of the rotor core 8 and the V-shaped recess 13 with the rotor shaft is θ2, and both inner end surfaces on the outermost peripheral side of the V-shaped insertion hole of the permanent magnet 10 are the rotor shafts. When the angle between the angles is θ1, the relationship is θ1 <θ2. Further, when the value of 360 degrees / number of poles is θ4, θ2 / θ4 is set to 66.7% to 85.7%.

  FIG. 3 is a diagram illustrating characteristics of the permanent magnet type rotating electric machine according to the first embodiment. The horizontal axis shows the ratio of θ2 / θ4 normalized with the ratio of θ2 / θ4 when there is no recess 13 as 100%, and the vertical axis shows the motor with the efficiency when there is no recess 13 as 1.0 pu. Shows efficiency. In FIG. 3, the examination result of the quality of commutation was also described.

  The commutation quality is indicated by a symbol ◯ when the position sensor signal by the induced voltage is stably obtained and the armature current waveform is stable when the rotating electric machine is driven by the position sensorless 120-degree conduction inverter. The position sensor signal by becomes unstable, the peak current appears in the armature current waveform, and the rotation speed becomes unstable.

  According to FIG. 3, when θ2 / θ4 is 100% or 90%, the commutation operation becomes unstable, but the provision of the recess 13 resulted in an improvement in motor efficiency.

  On the other hand, when θ2 / θ4 is 85.7%, the commutation operation becomes stable, and the provision of the recess 13 results in an improvement in motor efficiency.

  When driven by a position sensorless 120-degree energizing inverter, the induced voltage of the rotating electrical machine is detected to detect the position. That is, an induced voltage appears between the terminals of the rotating electrical machine in a non-energized section of 30 degrees with respect to a 120-degree energized section, and the position is detected from the zero cross point.

  An armature current flows through the winding, and it is necessary to commutate in a 30-degree section. However, the concentrated winding itself has a large inductance and a narrow induced voltage range, so that the armature current cannot be reduced quickly.

  As a countermeasure, it is considered that the inductance of the winding should be reduced.

  However, since the leakage inductance of the winding itself is specified from the structure and the size is small, the inductance generated based on the coupling between the rotor core shape called the horizontal axis inductance and the armature winding is reduced. It may be reduced.

  The first embodiment is based on this policy, and the permanent magnet is formed in a V shape that is convex with respect to the rotor axis, and a substantially V-shaped recess is formed between the poles of the outer peripheral surface of the rotor core. As a result, the leakage flux of the permanent magnet 10 decreases, the torque due to the magnet flux increases, and the armature reaction magnetic flux generated by the armature current is reduced.

  Therefore, the horizontal axis inductance is reduced, the armature current can be quickly commutated, and a permanent magnet type rotating electrical machine that can be driven stably even if driven by the position sensorless 120-degree conduction inverter is obtained.

  Furthermore, it has been confirmed by experiments that if θ2 / θ4 is decreased to 75.5%, 66.7%, and 55%, the commutation operation becomes stable, but the limit of reducing the motor efficiency appears. From the viewpoint of stabilizing the commutation operation and improving the motor efficiency, the range from θ2 / θ4 = 85.7% to θ2 / θ4 = 66.7% where the same motor efficiency can be obtained is optimal. If θ2 / θ4 is set within the range of 66.7% to 85.7%, the motor efficiency can be improved by about 1.5%. The angle θ2 / θ4 = 66.7% is a value of an angle θ3 formed by both outer end faces on the outermost peripheral side of the V-shaped insertion hole of the permanent magnet and the rotor shaft.

Embodiment 2

  FIG. 4 is a cross-sectional view illustrating the radial cross-sectional shape of the rotor by enlarging the rotor 7 of the second embodiment of the permanent magnet type rotating electrical machine according to the present invention. In the second embodiment shown in FIG. 4, the difference from the first embodiment in FIG. 2 is that the shape of the permanent magnet 10 is changed to a U-shaped permanent magnet 14.

  Also in the second embodiment, the same effects as those in the first embodiment shown in FIG. 1 can be obtained.

Embodiment 3

  FIG. 5 is a cross-sectional view illustrating the radial cross-sectional shape of the rotor by enlarging the rotor 7 of the third embodiment of the permanent magnet type rotating electrical machine according to the present invention. The third embodiment shown in FIG. 5 differs from the first embodiment shown in FIG. 2 in that slits 15 are formed in the upper portion of the permanent magnet 10 at a position where θ4 is divided into three equal parts, that is, where θ4 / 3 = θ5 = θ6 = θ7. 16 is formed.

  In the third embodiment, the armature reaction magnetic flux generated by the armature current is further reduced with respect to the shape of the first embodiment shown in FIG. Can be commutated.

Embodiment 4

  FIG. 6 is a cross-sectional view illustrating a radial cross-sectional shape of the rotor by enlarging the rotor 7 of the fourth embodiment of the permanent magnet type rotating electric machine according to the present invention. In the fourth embodiment shown in FIG. 6, the difference from the second embodiment shown in FIG. 4 is that slits 15 are formed in the upper part of the permanent magnet 10 at a position where θ4 is divided into three equal parts, that is, where θ4 / 3 = θ5 = θ6 = θ7. 16 is formed.

  In the fourth embodiment, the armature reaction magnetic flux generated by the armature current is further reduced with respect to the shape of the second embodiment shown in FIG. Can be commutated.

Embodiment 5

  FIG. 7 is a cross-sectional view showing a radial cross-sectional shape of Embodiment 5 of the permanent magnet type rotating electric machine according to the present invention. The fifth embodiment shown in FIG. 7 is different from the first embodiment shown in FIG. 1 in that a stator slit 17 is provided at the center of the teeth 3 of the stator core 2.

  In the fifth embodiment, the stator slit 17 acts in the direction of decreasing the leakage magnetic flux of the permanent magnet 10 with respect to the shape of the first embodiment in FIG. Can be raised.

Embodiment 6

  FIG. 8 is an enlarged sectional view of the rotor 7 of the sixth embodiment of the permanent magnet type rotating electric machine according to the present invention, showing the radial sectional shape of the rotor. In the sixth embodiment shown in FIG. 8, the difference from the first embodiment shown in FIG. 2 is that the angle formed by the intersection of the outer peripheral surface of the rotor 7 and the V-shaped recesses 19 and 20 with the rotor axis is θ8, which is permanent. When the angle between both inner end faces on the outermost peripheral side of the V-shaped insertion hole of the magnet and the rotor shaft is θ2, the relationship θ8 <θ2 is set. As a result, convex portions 18 are formed between the V-shaped permanent magnets 10.

  In the sixth embodiment, the armature reaction magnetic flux generated by the armature current is slightly larger and the horizontal axis inductance is slightly larger than the shape of the first embodiment in FIG. Thus, the armature current can be commutated quickly.

Embodiment 7

  FIG. 9 is a cross-sectional view showing a radial cross-sectional shape of the rotor by enlarging the rotor 7 of the seventh embodiment of the permanent magnet type rotating electric machine according to the present invention. In the seventh embodiment shown in FIG. 9, the difference from the sixth embodiment in FIG. 8 is that slits 15 and 16 are formed in the upper part of the permanent magnet 10.

  In the seventh embodiment, the armature reaction magnetic flux generated by the armature current is further reduced with respect to the shape of the sixth embodiment in FIG. Can be commutated.

Embodiment 8

  FIG. 10 is a cross-sectional view illustrating a radial cross-sectional shape of the rotor by enlarging the rotor 7 of the eighth embodiment of the permanent magnet type rotating electric machine according to the present invention. In the eighth embodiment shown in FIG. 10, the difference from the sixth embodiment in FIG. 8 is that the angle formed by the intersection of the outer peripheral surface of the rotor 7 and the U-shaped concave portions 22 and 23 with the rotor axis is θ8, When the angle between both inner end faces on the outermost peripheral side of the V-shaped insertion hole of the magnet and the rotor shaft is θ2, the relationship θ8 <θ2 is set. Further, the radial position of the permanent magnet insertion hole 9 and the radial position of the U-shaped recesses 22 and 23 are shifted from each other. As a result, a convex portion 21 is formed between the U-shaped concave portions 22 and 23.

  In the eighth embodiment, the armature reaction magnetic flux generated by the armature current is slightly larger and the horizontal axis inductance is slightly larger than the shape of the sixth embodiment of FIG. 8, but overall, the horizontal axis inductance is Thus, the armature current can be commutated quickly.

It is sectional drawing which shows the radial direction cross-sectional shape of Embodiment 1 of the permanent-magnet-type rotary electric machine by this invention. It is sectional drawing which expands the rotor 7 of FIG. 1, and shows the radial direction cross-sectional shape of a rotor. It is a figure which shows the characteristic of the permanent magnet type rotary electric machine of Embodiment 1. It is sectional drawing which expands the rotor 7 of Embodiment 2 of the permanent magnet type rotary electric machine by this invention, and shows the radial cross-sectional shape of a rotor. It is sectional drawing which expands the rotor 7 of Embodiment 3 of the permanent magnet type rotary electric machine by this invention, and shows the radial direction cross-sectional shape of a rotor. It is sectional drawing which expands the rotor 7 of Embodiment 4 of the permanent magnet type rotary electric machine by this invention, and shows the radial cross-sectional shape of a rotor. It is sectional drawing which shows the radial direction cross-sectional shape of Embodiment 5 of the permanent-magnet-type rotary electric machine by this invention. It is sectional drawing which expands the rotor 7 of Embodiment 6 of the permanent magnet type rotary electric machine by this invention, and shows the radial cross-sectional shape of a rotor. It is sectional drawing which expands the rotor 7 of Embodiment 7 of the permanent magnet type rotary electric machine by this invention, and shows the radial cross-sectional shape of a rotor. It is sectional drawing which expands the rotor 7 of Embodiment 8 of the permanent magnet type rotary electric machine by this invention, and shows the radial direction cross-sectional shape of a rotor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Permanent magnet type rotary electric machine 2 Stator iron core 3 Teeth 4 Slot 5 Armature winding 6 Stator 7 Rotor 8 Rotor iron core 9 Permanent magnet insertion hole 10 Permanent magnet 11 Shaft fitting hole 12 Rivet hole 13 Recess 14 U-shape Shaped permanent magnet 15 Slit 16 Slit 17 Stator slit 18 Convex 19 V-shaped concavity 20 V-shaped concavity 21 Convex 22 C-shaped concavity 23 C-shaped concavity

Claims (1)

A stator in which concentrated armature windings are provided so as to surround a plurality of teeth formed in the stator core, and a rotor in which permanent magnets are housed in a plurality of permanent magnet insertion holes formed in the rotor core. The permanent magnet has a V-shape that is convex with respect to the axis of the rotor, a substantially V-shaped recess is formed between the outer peripheral surfaces of the rotor core, and the outer peripheral surface of the rotor Θ2 / θ4 is 66.7% or more to 85.5, where θ2 is the angle formed by the intersection of the substantially V-shaped concave portion and the rotor axis and θ4 is 360 degrees / pole number. A permanent magnet type rotating electrical machine characterized by being within 7%.

Images