JP5143166B2 - Single-phase induction motor and hermetic compressor - Google Patents

Description

  The present invention relates to a single-phase induction motor having a rotor slot filled with two or more kinds of conductive materials. The present invention also relates to a hermetic compressor equipped with the single-phase induction motor.

  Conventionally, in order to reduce vibration and noise due to slot harmonics of a cage rotor, a plurality of teeth are provided on the outer periphery of a circular thin iron plate, and the width of the teeth is gradually changed to change the slot spacing. In order to reduce the dynamic imbalance caused by unevenly providing slots on the circumference, the slot cross-sectional area is also gradually changed. A cage rotor to be formed has been proposed (see, for example, Patent Document 1).

JP-A-7-274457

  However, when the squirrel-cage rotor of Patent Document 1 is used for a single-phase induction motor, it is generated by passing a current through a stator winding (main winding, auxiliary winding) when starting the single-phase induction motor. Since the rotating magnetic field is an elliptical magnetic field, depending on the stop position of the squirrel-cage rotor, there is a problem that the starting torque becomes low and the starting characteristics deteriorate.

  The present invention has been made to solve the above-described problems, and by arranging the rotor slots filled with the conductive material having a low electrical resistivity continuously in a predetermined position, the starting characteristics are obtained. Provided are a single-phase induction motor and a hermetic compressor using the single-phase induction motor.

A single-phase induction motor according to the present invention includes a main winding inserted into a plurality of stator slots formed along the inner peripheral edge of a stator core manufactured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape. A single-phase induction motor comprising a stator having a wire and an auxiliary winding, and a rotor disposed on the inner peripheral side of the stator via a gap,
The rotor is
A rotor core manufactured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape;
A rotor slot formed along the outer periphery of the rotor core and filled with a conductive material,
Among the rotor slots, a predetermined number of rotor slots filled with a conductive material having a low electrical resistivity are continuously arranged at predetermined positions.

  The single-phase induction motor according to the present invention improves the starting torque by continuously arranging a predetermined number of rotor slots filled with a conductive material having a low electrical resistivity among the rotor slots at a predetermined position. There is an effect that can be.

FIG. 3 shows the first embodiment and is a cross-sectional view of the single-phase induction motor 100. The A section enlarged view of FIG. FIG. 5 shows the first embodiment, and is a cross-sectional view of the stator 12. FIG. 5 shows the first embodiment, and shows one pole of a winding 20 of the stator 12. FIG. 5 shows the first embodiment, and is a cross-sectional view of the stator core 12a. FIG. 3 shows the first embodiment and is a cross-sectional view of the rotor 11. FIG. 5 shows the first embodiment and is a cross-sectional view of the rotor core 11a. FIG. 3 is a diagram illustrating the first embodiment, and is a perspective view of a rotor 11. FIG. 5 shows the first embodiment, and is a start torque characteristic diagram with respect to an angle α of the single-phase induction motor 100. FIG. 5 shows the first embodiment, and is a longitudinal sectional view of a rotary compressor 510. AA sectional drawing of FIG. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor 11 in which a circular (small) air hole portion 11b-1 is provided at a position of an angle α. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor 11 in which a circular (large) air hole portion 11b-2 is provided at an angle α. FIG. 5 shows the first embodiment, and is a transverse cross-sectional view of a rotor 11 in which a square air hole portion 11b-3 is provided at a position of an angle α. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 11 in which an elliptical air hole portion 11b-4 is provided at a position of an angle α. FIG. 5 shows the first embodiment, and is a cross-sectional view of a single-phase induction motor 200 of a first modification. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 211. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 211a. FIG. 5 shows the first embodiment, and is a start torque characteristic diagram with respect to an angle α. FIG. 5 shows the first embodiment, and is a cross-sectional view of a single-phase induction motor 300 of a second modification. The B section enlarged view of FIG. The C section enlarged view of FIG. FIG. 5 shows the first embodiment, and is a start torque characteristic diagram with respect to an eccentric position β. FIG. 5 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 400 of Modification 3. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 411. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 411a. FIG. 5 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 500 of a fourth modification. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 511. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 511a. FIG. 5 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 600 of Modification 5. The D section enlarged view of FIG. The E section enlarged view of FIG. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 700 of modification example 6; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 711. FIG. 35 is a diagram showing the first embodiment and is an enlarged view of an F part in FIG. 34. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 711a. FIG. 5 shows the first embodiment, and is an enlarged sectional view of rotor slots 740a and 740c. FIG. 9 shows the first embodiment, and is a cross-sectional view of a single-phase induction motor 800 of modification example 7; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 811. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 811a. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 900 according to Modification 8; The G section enlarged view of FIG. The H section enlarged view of FIG. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1000 according to Modification 9; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1011. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1011a. FIG. 9 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1100 according to Modification 10; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1111. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1111a. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1200 of Modification 11; The I section enlarged view of FIG. The J section enlarged view of FIG. FIG. 9 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1300 according to a modification 12; The K section enlarged view of FIG. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1311. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1311a. 2A and 2B are diagrams illustrating the first embodiment, in which FIG. 3A is a cross-sectional view of a rotor large slot 40f, and FIG. 3B is a cross-sectional view of a rotor small slot 40e. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1311 provided with a rotor large slot 40h that is long in the radial direction. FIG. 5 shows the first embodiment, and is a cross-sectional view of a rotor core 1311a provided with a rotor large slot 40h that is long in the radial direction. 2A and 2B are diagrams illustrating the first embodiment, in which FIG. 4A is a transverse cross-sectional view of a rotor large slot 40h, and FIG. 4B is a transverse cross-sectional view of a rotor small slot 40e. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1400 according to Modification 13; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1411. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1411a. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1411 provided with a rotor large slot 40h that is long in the radial direction. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1411a provided with a rotor large slot 40h that is long in the radial direction. FIG. 15 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1500 according to Modification 14; FIG. 66 is an enlarged view of a portion L in FIG. 66. The M section enlarged view of FIG. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1600 of a modification 15. The N section enlarged view of FIG. The P section enlarged view of FIG. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1700 of Modification Example 16; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1711. The Q section enlarged view of FIG. 73 (cross-sectional view of the aluminum bar 730f containing a copper bar). Fig. 5 shows the first embodiment, and is a cross-sectional view of an aluminum bar 730a. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1711a. FIG. 4 is a diagram illustrating the first embodiment, in which (a) is a cross-sectional view of a large rotor slot 740f, and (b) is a cross-sectional view of a small rotor slot 740a-0. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1800 of Modification 17. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1811. The R section enlarged view of FIG. 79 (cross-sectional view of the aluminum bar 730h containing a copper bar). FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1811a. 2A and 2B are diagrams showing the first embodiment, in which FIG. 3A is a transverse sectional view of a rotor large slot 740h, and FIG. 4B is a transverse sectional view of a rotor small slot 740a-0. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 1900 according to modification 18; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 1911. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 1911a. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 2000 of Modification 19; FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor 2011. FIG. 5 shows the first embodiment and is a cross-sectional view of a rotor core 2011a. FIG. 10 shows the first embodiment, and is a transverse cross-sectional view of a single-phase induction motor 2100 of Modification 20. The S section enlarged view of FIG. The T section enlarged view of FIG. FIG. 9 shows the first embodiment, and is a cross-sectional view of a single-phase induction motor 2200 of a modification 21. The U section enlarged view of FIG. The V section enlarged view of FIG.

Embodiment 1 FIG.
1 to 9 are diagrams showing the first embodiment. FIG. 1 is a cross-sectional view of the single-phase induction motor 100, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 4 is a view showing one pole of the winding 20 of the stator 12, FIG. 5 is a cross-sectional view of the stator core 12a, FIG. 6 is a cross-sectional view of the rotor 11, and FIG. 7 is a cross-section of the rotor core 11a. FIG. 8 is a perspective view of the rotor 11, and FIG. 9 is a start torque characteristic diagram with respect to the angle α of the single-phase induction motor 100.

  The configuration of the single-phase induction motor 100 will be described with reference to FIGS.

  Single-phase induction motor 100 includes a stator 12 and a rotor 11.

  Hereinafter, the single-phase induction motor 100 may be simply referred to as a motor or an electric motor.

  The stator 12 includes a stator core 12a, and a main winding 20b and an auxiliary winding 20a that are inserted into the stator slot 12b of the stator core 12a. For the main winding 20b and the auxiliary winding 20a, a magnet wire having an insulating coating on the outside of a copper wire is generally used.

  The stator slot 12b includes an insulating material (for example, a slot cell, a slot cell, etc.) in order to ensure electrical insulation between the winding 20 (main winding 20b and auxiliary winding 20a) and the stator core 12a. A wedge, a separator, etc.) are inserted, but the illustration is omitted here.

  The stator core 12a is made of an electromagnetic steel sheet having a thickness of 0.1 to 1.5 mm (for example, a non-oriented electrical steel sheet (the direction of the crystal axis of each crystal so as not to be biased toward a specific direction of the steel sheet and exhibit magnetic properties) As far as random))) is punched into a predetermined shape, it is laminated in a predetermined number of axial directions (stacking direction) and fixed by punching or welding.

  Stator slots 12b are formed along the inner peripheral edge of the stator core 12a. The stator slots 12b are arranged at substantially equal intervals in the circumferential direction. In the example of FIG. 1, all the stator slots 12b have the same shape. For example, when a notch is formed in the outer peripheral edge of the stator core 12a, in order to secure the magnetic path area of the core back, a stator slot at a position where the outer peripheral edge has a notch is cut in the outer peripheral edge. Make it smaller than the stator slot where there is no notch (the radial dimension is small).

  As shown in FIG. 5, the iron core part between the stator slots 12b is called teeth 12e. The teeth 12e have substantially the same circumferential width and extend in the radial direction. In the example shown in FIG. 5, the number of teeth 12e is 24, which is the same as the number of stator slots 12b. The outer periphery of the stator core 12a is a substantially cylindrical core back 12d. A plurality (24 in FIG. 5) of teeth 12e extend radially inward from the substantially cylindrical core back 12d at substantially equal intervals in the circumferential direction.

  The stator slot 12b extends in the radial direction. The stator slot 12b opens to the inner peripheral edge. This opening is called slot opening. The main winding 20b and the auxiliary winding 20a are inserted from this slot opening. In the example of FIG. 1, the stator core 12 a includes 24 stator slots 12 b. However, the number of stator slots 12b is not limited to 24.

  The main winding 20b is a two-pole concentric winding. In the example of FIG. 1, the main winding 20b is disposed on the inner peripheral side (side closer to the rotor 11) in the stator slot 12b. Here, the concentric winding main winding 20b is composed of five (five stages) coils having different sizes (particularly circumferential lengths). And it inserts in the stator slot 12b so that the center of those five coils may become the same position. Therefore, it is called a concentric winding method. The main winding 20b is shown as having five coils, but this is an example, and the number is not limited.

  The five coils of the main winding 20b span the larger one (stator slot 12b having a slot pitch of 11 and # 1 to # 12 (or # 13 to # 24) in FIG. 4 (see also FIG. 3)). M1 and M2 (in which the stator slot 12b has a slot pitch of 9 and is wound over # 2 to # 11 (or # 14 to # 23) of FIG. 4 (also see FIG. 3)) M3 (slot pitch of stator slot 12b is 7 and wound over # 3 to # 10 (or # 15 to # 22) in FIG. 4 (also see FIG. 3)), M4 (see also FIG. 3) (fixed) The slot pitch of the child slot 12b is 5, wound around the # 4 to # 9 (or # 16 to # 21) of FIG. 4 (also see FIG. 3), M5 (the slot pitch of the stator slot 12b is 3, # 5 to # 8 (or # 1) in FIG. 4 (see also FIG. 3) ~ # 20) is wound across) to. The distribution (the distribution of the number of turns) of them (M1 to M5 coils) is selected to be a substantially sine wave. This is because the main winding magnetic flux generated when the main winding current flows through the main winding 20b becomes a sine wave. That is, the number of turns of M1 to M5 is normally M1 ≧ M2 ≧ M3> M4> M5.

  The main winding 20b may be arranged on either the inner peripheral side or the outer peripheral side in the stator slot 12b. However, when the main winding 20b is disposed on the inner peripheral side of the stator slot 12b, the winding (coil) peripheral length is shorter than when the main winding 20b is disposed on the outer peripheral side of the stator slot 12b. Further, when the main winding 20b is arranged on the inner peripheral side in the stator slot 12b, the leakage magnetic flux is reduced as compared with the case where it is arranged on the outer peripheral side in the stator slot 12b. Therefore, when the main winding 20b is disposed on the inner peripheral side in the stator slot 12b, the impedance (resistance value, leakage reactance) of the main winding 20b is larger than that in the outer peripheral side in the stator slot 12b. Get smaller. Therefore, the characteristics of the single phase induction motor 100 are improved.

  A main winding magnetic flux is generated by supplying a main winding current to the main winding 20b. The direction of the main winding magnetic flux is the left-right direction in FIG. As described above, the number of turns of the five coils (M1, M2, M3, M4, M5) of the main winding 20b is selected so that the waveform of the main winding magnetic flux is as sine as possible. Since the main winding current flowing through the main winding 20b is alternating current, the magnitude and direction are changed according to the main winding current through which the main winding magnetic flux also flows.

  Similarly to the main winding 20b, a concentric winding type auxiliary winding 20a is inserted into the stator slot 12b. In FIG. 1, the auxiliary winding 20a is disposed outside the stator slot 12b. An auxiliary winding magnetic flux is generated by passing an auxiliary winding current through the auxiliary winding 20a. The direction of the auxiliary winding magnetic flux is orthogonal to the direction of the main winding magnetic flux (vertical direction in FIG. 1). That is, the auxiliary winding 20a is arranged at a position shifted by 90 degrees with respect to the main winding 20b. Since the auxiliary winding current flowing in the auxiliary winding 20a is alternating current, the auxiliary winding magnetic flux also changes its size and direction according to the current.

  Generally, the main winding magnetic flux and the auxiliary winding magnetic flux have an electrical angle of 90 degrees (here, the number of poles is two, so the mechanical angle is 90 degrees). 20b and the auxiliary winding 20a are inserted into the stator slot 12b.

  In the example of FIG. 1, the auxiliary winding 20a is composed of three coils having different sizes (particularly in the circumferential direction). The three coils of the auxiliary winding 20a are extended over the larger one (stator slot 12b having a slot pitch of 11 and # 7 to # 18 (or # 6 to # 19) in FIG. 4 (also see FIG. 3)). A1 and A2 (the stator slot 12b has a slot pitch of 9, and is wound over # 8 to # 17 (or # 5 to # 20) of FIG. 4 (also see FIG. 3)) A3 (the slot pitch of the stator slot 12b is 7, and it is wound over # 9 to # 16 (or # 4 to # 21) in FIG. 4 (also see FIG. 3)). The distribution is selected to be approximately a sine wave. This is because the auxiliary winding magnetic flux generated when the auxiliary winding current flows through the auxiliary winding 20a becomes a sine wave.

  And it inserts in the stator slot 12b so that the center of those three coils (A1, A2, A3) may become the same position.

  The windings of the three coils (A1, A2, A3) of the auxiliary winding 20a are selected so that the waveform of the auxiliary winding magnetic flux is as sinusoidal as possible. Usually, A1> A2> A3.

  A main winding 20b is connected in parallel to an operation capacitor (not shown) connected in series with the auxiliary winding 20a. Connect both ends to a single-phase AC power supply. By connecting the operating capacitor in series with the auxiliary winding 20a, the phase of the auxiliary winding current flowing through the auxiliary winding 20a can be advanced by about 90 degrees with respect to the phase of the main winding current flowing through the main winding 20b. .

  The positions of the main winding 20b and the auxiliary winding 20a in the stator core 12a are shifted by 90 degrees in electrical angle, and the phases of the currents of the main winding 20b and the auxiliary winding 20a are different by about 90 degrees. A pole rotating magnetic field is generated.

  On the outer peripheral surface of the stator iron core 12a, there are provided four stator cutouts 12c that form a substantially straight line portion obtained by cutting out the outer circular shape into a substantially straight line shape. Adjacent ones of the four stator cutouts 12c are arranged at a substantially right angle. Accordingly, a substantially quadrilateral is formed by straight lines passing through the four stator notches 12c. However, this is an example, and the number and arrangement of the stator notches 12c may be arbitrary.

  When the single-phase induction motor 100 of FIG. 1 is mounted on the hermetic compressor, the stator 12 is shrink-fitted on the inner periphery of the cylindrical hermetic container of the hermetic compressor. Inside the hermetic compressor, the refrigerant (including refrigeration oil) passes through the single-phase induction motor 100. Therefore, the single-phase induction motor 100 requires a refrigerant passage.

  By providing the stator notch 12c having a substantially straight portion, a refrigerant passage is formed between the stator 12 and the sealed container. In the refrigerant passage of the single-phase induction motor 100, in addition to the stator notch 12c on the outer peripheral surface of the stator core 12a, for example, the air hole portion 11b (see FIG. 6) of the rotor 11, the stator 12 and the rotation There is a gap 60 (see FIG. 2) between the child 11.

  For example, in the case of a rotary compressor, which will be described later, a compression element and an electric motor are accommodated in an airtight container, and the electric motor is disposed at the upper part and the compression element is disposed at the lower part. The compression element sucks up the refrigerating machine oil stored at the bottom of the sealed container, lubricates the sliding part of the compression element with the refrigerating machine oil, and a part of the refrigerating machine oil passes through the electric motor together with the refrigerant discharged from the compression element. At this time, the refrigerant containing the refrigerating machine oil passes through the air hole of the rotor of the electric motor, the gap between the stator and the rotor, the stator notch on the outer peripheral surface of the stator core, and the like. The refrigerant containing the refrigeration oil that has passed through the electric motor is separated from the refrigerant at the top of the electric motor by an oil separator or the like. Return. The refrigerant is discharged to the refrigeration cycle outside the sealed container.

  A rotor 11 is provided on the inner peripheral side of the stator 12 via a gap 60 (see FIG. 2). The rotor 11 includes a rotor core 11a and a cage-shaped secondary conductor (bar (for example, an aluminum bar)). And end ring 32). For example, the gap 60 between the stator 12 and the rotor 11 has a radial dimension of about 0.2 to 2.0 mm.

  As with the stator core 12a, the rotor core 11a is an electromagnetic steel sheet having a thickness of 0.1 to 1.5 mm (for example, a non-oriented electrical steel sheet (in order not to show magnetic characteristics in a specific direction of the steel sheet). The crystal axis direction of the crystal is randomly arranged as much as possible))) is punched into a predetermined shape and laminated in the axial direction. Usually, the electromagnetic steel sheet of the inner side (inner peripheral side) of the stator core 12a is used.

  In general, the rotor core 11a is often punched from the same material as the stator core 12a. However, the rotor core 11a may be made of a material different from that of the stator core 12a.

  The rotor core 11a is provided on the outer peripheral side in the radial direction along the outer peripheral edge of the rotor core 11a. A rotor slot 40a in which an aluminum bar 30a is formed, and a copper bar 30c (from aluminum) in part other than aluminum. And a rotor slot 40c into which a conductive material having a low electrical resistivity is inserted.

  In the example of FIG. 1 (FIG. 7), the number of rotor slots is 26 for the rotor slots 40a and 4 for the rotor slots 40c, which is 30 in total. As a result, the single-phase induction motor 100 of FIG. 1 is a combination in which the stator core 12a has 24 slots and the rotor core 11a has 30 total slots. However, this is an example, and the combination of the number of slots of the stator core 12a and the number of slots of the rotor core 11a is not limited to this.

  A squirrel-cage induction motor is known to have abnormal phenomena such as synchronous torque, asynchronous torque, vibration and noise. It is clear that the abnormal phenomenon of the squirrel-cage induction motor is caused by the spatial harmonics of the gap magnetic flux density, but there are two possible causes for the spatial harmonics. One is a harmonic contained in the magnetomotive force due to the winding arrangement, and the other is caused by the fact that the air gap permeance (reciprocal of the magnetic resistance) is not uniform due to the presence of the stator slot and the rotor slot. It is a harmonic contained in the gap magnetic flux density.

  Thus, in a squirrel-cage induction motor, the combination of the number of slots of the stator and the number of slots of the rotor is closely related to abnormal phenomena such as synchronous torque, asynchronous torque, vibration and noise. Therefore, the combination of the number of slots of the stator and the number of slots of the rotor is carefully selected.

  After inserting the copper bar 30c into the rotor slot 40c, aluminum as a conductive material is cast together with the rotor slot 40a (aluminum die casting) to form the aluminum bar 30a. Aluminum is generally used as the conductive material.

  The bar (made of aluminum and copper) formed in the rotor slot 40c into which the copper bar 30c is inserted has a smaller resistance value than the aluminum bar 30a formed in the rotor slot 40a.

  The aluminum bar 30a (more precisely, 26 aluminum-only bars, 4 aluminum and copper bars) is formed in a cage shape together with an end ring 32 (see FIG. 8) provided on the end face of the rotor 11 in the stacking direction. A secondary conductor is formed. Generally, the aluminum bar 30a and the end ring 32 are manufactured by simultaneously casting aluminum by die casting.

  As shown in FIGS. 1 and 6, the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is downward, the direction of the main winding magnetic flux generated by the main winding 20b is rightward, and the rotation direction of the rotor 11 Is clockwise, the central portions of the four rotor slots 40c arranged in succession are arranged side by side at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux (angle α = 45 degrees). The above-described positional relationship is established when the single-phase induction motor 100 is stopped or started.

  Further, the starting torque characteristic diagram shown in FIG. 9 shows the starting torque ratio with respect to the angle α shown in FIG. 6, and the starting torque ratio on the vertical axis indicates that all rotor slots are constituted by only the aluminum bar 30a. The ratio with respect to the starting torque in the case of the rotor slot 40a is shown.

  In FIG. 9, when the angle α is changed, the starting torque characteristic changes, and the starting torque (starting torque ratio) becomes maximum when α is about 45 degrees and about 225 degrees, and α is about 135 degrees and about 315. It can be seen that the starting torque (starting torque ratio) is minimized at the position of degrees. Since it is a two-pole single-phase induction motor 100, it has periodicity every 180 degrees.

  In the case of a single-phase induction motor, the main winding electric current flowing through the main winding 20b is much larger than the auxiliary winding current flowing through the auxiliary winding 20a at the time of start-up, that is, generated by the auxiliary winding 20a. The main winding magnetic flux generated by the main winding 20b is larger than the auxiliary winding magnetic flux, and the dipolar rotating magnetic field composed of the combined magnetic fields tends to be an elliptical magnetic field close to an alternating magnetic field.

  The rotor slot is composed of an asymmetrical structure including rotor slots 40a (26 pieces) composed only of aluminum bars 30a and rotor slots 40c (four pieces continuous) filled with copper bars 30c in addition to aluminum. Then, due to the influence of the elliptical magnetic field, the starting torque characteristic with respect to the angle α changes as shown in FIG.

  In the present embodiment, by arranging the rotor slot 40c so that the angle α is at a position of about 45 degrees, the starting torque characteristics are improved and a highly reliable single-phase induction motor can be obtained.

  As shown in FIG. 4, the starting torque is maximum at the position where the angle α is about 45 degrees and shows the best starting characteristics. However, if the angle α is in the range of 20 to 70 degrees, the starting is good. It is possible to obtain characteristics.

  As described above, since the starting torque characteristic has a periodicity of 180 degrees, even if the angle α is set in the range of 200 to 250 degrees, the same characteristic is exhibited.

  In addition, the starting torque is improved by arranging the rotor slot 40c filled with the copper bar 30c asymmetrically. However, when the starting torque equivalent to the rotor slot 40a composed of only the aluminum bar 30a is sufficient, It is possible to reduce the number of stacked layers (stacked thickness) of the stator core 12a and the rotor core 11a.

  When the number of laminated stator cores 12a and rotor cores 11a is reduced, the amount of electromagnetic steel sheets used is reduced, and the amount of windings used is reduced as the peripheral lengths of the main winding 20b and auxiliary winding 20a are reduced. The low-cost single-phase induction motor 100 can be obtained. Furthermore, a lightweight single-phase induction motor 100 can be obtained by reducing the amount of electromagnetic steel sheets and windings used.

  When this single-phase induction motor 100 is mounted on a hermetic compressor, the rotary shaft 50 of the rotor 11 is connected to the compression element of the hermetic compressor, and when the pressure of the compression element is balanced and stopped, it is general. Thus, the rotor 11 stops at a predetermined rotational position. For example, when the hermetic compressor is a rotary compressor, when the pressures of the compression elements are balanced and stopped, the rolling piston tends to be positioned at the bottom dead center. Accordingly, the position of the angle α = 45 degrees in FIG. 1 and FIG. 6 (the position where the central portion of the four rotor slots 40c arranged continuously is delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux). If the rotary compressor is assembled so that the position of the bottom dead center (described later) of the compression element substantially matches, the startability of the rotary compressor can be improved, and a highly reliable rotary compressor Can be obtained. The angle α = 45 degrees is most preferable, but the angle α = 20 to 70 degrees may be used.

  Here, the rotary compressor will be described. 10 and 11 show the first embodiment, FIG. 10 is a longitudinal sectional view of the rotary compressor 510, and FIG. 11 is an AA sectional view of FIG.

  An example of the rotary compressor 510 shown in FIG. 10 is a vertical type in which the inside of the sealed container 70 is high pressure. A compression element 501 is housed in the lower part of the sealed container 70. A single-phase induction motor 100 (see FIG. 1), which is an electric element that drives the compression element 501, is accommodated above the compression element 501 in the upper part of the sealed container 70.

  Refrigerating machine oil 90 that lubricates the sliding portions of the compression element 501 is stored at the bottom of the sealed container 70.

  First, the configuration of the compression element 501 will be described. The cylinder 1 in which the compression chamber is formed has a cylinder chamber 1b whose outer periphery is substantially circular in a plan view and is a space that is substantially circular in a plan view. The cylinder chamber 1b is open at both axial ends. The cylinder 1 has a predetermined axial height in a side view.

  A parallel vane groove 1 a that communicates with a cylinder chamber 1 b that is a substantially circular space of the cylinder 1 and extends in the radial direction is provided so as to penetrate in the axial direction.

  Further, a back pressure chamber 1c, which is a substantially circular space in plan view, communicating with the vane groove 1a is provided on the back surface (outside) of the vane groove 1a.

  A suction port (not shown) through which suction gas from the refrigeration cycle passes through the cylinder 1 passes through the cylinder chamber 1 b from the outer peripheral surface of the cylinder 1.

  The cylinder 1 is provided with a discharge port (not shown) in which the vicinity of the edge of the circle forming the cylinder chamber 1b that is a substantially circular space (the end surface on the single-phase induction motor 100 side) is cut out.

  The material of the cylinder 1 is gray cast iron, sintered, carbon steel or the like.

  The rolling piston 2 rotates eccentrically in the cylinder chamber 1b. The rolling piston 2 has a ring shape, and the inner periphery of the rolling piston 2 is slidably fitted to the eccentric shaft portion 50 a of the rotating shaft 50.

  It is assembled so that there is always a constant gap between the outer periphery of the rolling piston 2 and the inner wall of the cylinder chamber 1b of the cylinder 1.

  The material of the rolling piston 2 is alloy steel containing chromium or the like.

  The vane 3 is accommodated in the vane groove 1a of the cylinder 1, and the vane 3 is always pressed against the rolling piston 2 by the vane spring 8 provided in the back pressure chamber 1c. The rotary compressor 510 has a high pressure inside the hermetic container 70. Therefore, when the operation is started, the force due to the differential pressure between the high pressure in the hermetic container 70 and the pressure in the cylinder chamber 1b is provided on the back surface (back pressure chamber 1c side) of the vane 3. Therefore, the vane spring 8 is used mainly for the purpose of pressing the vane 3 against the rolling piston 2 when the rotary compressor 510 is started (when there is no difference between the pressure in the sealed container 70 and the cylinder chamber 1b). .

  The shape of the vane 3 is a flat shape (the thickness in the circumferential direction is smaller than the length in the radial direction and the axial direction).

  High-speed tool steel is mainly used as the material of the vane 3.

  The main bearing 4 is slidably fitted to a main shaft portion 50b (a portion above the eccentric shaft portion 50a and a portion fitting the rotor 11) of the rotating shaft 50, and a cylinder chamber 1b (vane) of the cylinder 1. One end face (including the groove 1a) (single-phase induction motor 100 side) is closed.

  The main bearing 4 includes a discharge valve (not shown). However, it may be attached to either one or both of the main bearing 4 and the sub-bearing 5.

  The main bearing 4 has a substantially inverted T shape when viewed from the side.

  The sub-bearing 5 is slidably fitted to the sub-shaft portion 50c (a portion below the eccentric shaft portion 50a) of the rotating shaft 50, and the other end face of the cylinder chamber 1b (including the vane groove 1a) of the cylinder 1 (Refrigerating machine oil 90 side) is closed.

  The secondary bearing 5 is substantially T-shaped in a side view.

  The material of the main bearing 4 and the sub bearing 5 is the same as that of the cylinder 1, and is made of gray cast iron, sintered, carbon steel, or the like.

  A discharge muffler 7 is attached to the main bearing 4 on the outer side (single-phase induction motor 100 side). The high-temperature and high-pressure discharge gas discharged from the discharge valve of the main bearing 4 enters the discharge muffler 7 at one end and is then discharged from the discharge muffler 7 into the sealed container 70. However, the discharge muffler 7 may be provided on the sub-bearing 5 side.

  A suction muffler 21 is provided beside the hermetic container 70 to suck low-pressure refrigerant gas from the refrigeration cycle and prevent liquid refrigerant from being directly sucked into the cylinder chamber of the cylinder 1 when the liquid refrigerant returns. The suction muffler 21 is connected to the suction port of the cylinder 1 via the suction pipe 22. The main body of the suction muffler 21 is fixed to the side surface of the sealed container 70 by welding or the like.

  A terminal 24 (referred to as a glass terminal) connected to a power source that is a power supply source is fixed to the sealed container 70 by welding. In the example of FIG. 1, the terminal 24 is provided on the upper surface of the sealed container 70. The terminal 24 is connected to the lead wire 23 from the single-phase induction motor 100 which is an electric element.

  A discharge pipe 25 having both ends opened is inserted into the upper surface of the sealed container 70. The discharge gas discharged from the compression element 501 is discharged from the sealed container 70 through the discharge pipe 25 to the external refrigeration cycle.

  A general operation of the rotary compressor 510 will be described. When power is supplied from the terminal 24 and the lead wire 23 to the stator 12 (winding 20) of the single-phase induction motor 100, which is an electric element, the rotor 11 rotates. Then, the rotating shaft 50 fixed to the rotor 11 rotates, and the rolling piston 2 rotates eccentrically in the cylinder chamber 1b of the cylinder 1 accordingly. A space between the cylinder chamber 1 b of the cylinder 1 and the rolling piston 2 is divided into two by a vane 3. As the rotary shaft 50 rotates, the volumes of these two spaces change, and the volume gradually increases on one side, so that the refrigerant is sucked from the suction muffler 21 and the volume gradually decreases on the other side. The refrigerant gas is compressed. The compressed discharge gas is discharged once from the discharge muffler 7 into the sealed container 70, passes through the single-phase induction motor 100 that is an electric element, and is discharged from the discharge pipe 25 on the upper surface of the sealed container 70 to the outside of the sealed container 70. Discharged.

  For example, as shown in FIGS. 1, 2, and 6, the discharge gas that passes through the single-phase induction motor 100 that is an electric element is an air hole portion 11 b (through hole) of the rotor 11 of the single-phase induction motor 100, fixed. It passes through a gap 60 including a slot opening (not shown, also referred to as a slot opening) of the core 12a, a stator notch 12c disposed on the outer periphery of the stator core 12a, and the like.

When the rotary compressor 510 performs the above operation, there are a plurality of sliding portions where the components slide as shown below.
(1) First sliding portion: outer periphery 2a of rolling piston 2 and tip 3a (inner side) of vane 3;
(2) Second sliding portion: vane groove 1a of cylinder 1 and side surface portion 3b (both side surfaces) of vane 3;
(3) Third sliding portion: inner periphery 2b of rolling piston 2 and eccentric shaft portion 50a of rotating shaft 50;
(4) Fourth sliding portion: inner periphery of main bearing 4 and main shaft portion 50b of rotating shaft 50;
(5) Fifth sliding portion: the inner periphery of the auxiliary bearing 5 and the auxiliary shaft portion 50c of the rotating shaft 50.

The parts constituting the sliding portion provided in the compression element 501 are collected.
(1) Cylinder 1;
(2) Rolling piston 2;
(3) Vane 3;
(4) Main bearing 4;
(5) Sub bearing 5;
(6) Rotating shaft 50.

  As already described, in the case of the rotary compressor 510, when the pressure of the compression element 501 is balanced and stopped, the rolling piston 2 tends to be located at the bottom dead center (state of FIG. 11). Accordingly, the position of the angle α = 45 degrees in FIG. 1 and FIG. 6 (the position where the central portion of the four rotor slots 40c arranged continuously is delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux). If the rotary compressor 510 is assembled so that the position of the bottom dead center of the compression element substantially matches, the startability of the rotary compressor 510 can be improved, and a highly reliable rotary compressor 510 can be obtained. Can be obtained.

  As described above, by combining the single-phase induction motor 100 of the present embodiment with a load (in this case, the compression element 501 of the rotary compressor 510) having a substantially constant rotational position (bottom dead center) at the time of stopping. 1 and FIG. 6, the starting torque at an angle α = 45 degrees (the position where the central part of the four rotor slots 40 c arranged continuously is delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux). It is possible to take advantage of the feature that is maximized.

  Even if a load (for example, a blower fan or the like) in which the position in the rotational direction at the time of stopping is combined with the single-phase induction motor 100 of the present embodiment is not determined at which angle α in FIG. The characteristics of the single-phase induction motor 100 of the embodiment cannot be utilized.

  1 and FIG. 6 at an angle α = 45 degrees (a position where the central portion of the four rotor slots 40c arranged continuously is delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux); In order to assemble the rotary compressor 510 so that the position of the bottom dead center of the compression element 501 substantially coincides, for example, there is a method described below. That is, as shown in FIG. 1 (FIGS. 3 and 5), the notch 12f is provided at the position of the outer peripheral edge of the stator core 12a at the angle α. For example, the notch 12f has a substantially semicircular shape, but the shape may be arbitrary. Any shape such as a square, a triangle, an ellipse, a trapezoid, and a wedge may be used.

  Further, on the compression element 501 side, a notch 1d is provided at the position of the bottom dead center of the outer periphery of the cylinder 1. This notch 1d shows a substantially semicircular shape, for example, but the shape may be arbitrary. Any shape such as a square, a triangle, an ellipse, a trapezoid, and a wedge may be used.

  When the rotary compressor 510 is assembled, the compression element 501 and the stator 12 are shrink-fitted into the sealed container 70. The hermetic container 70 is heated so that the inner diameter of the hermetic container 70 is larger than normal temperature, and the compression element 501 and the stator 12 are inserted into the hermetic container 70 in this state, and the temperature of the hermetic container 70 is close to normal temperature or normal temperature. For example, the inner diameter of the sealed container 70 becomes smaller than that of the high temperature state, and the compression element 501 and the stator 12 are fixed. At this time, if the notch 1d (the position of the bottom dead center of the outer peripheral edge) of the cylinder 1 and the notch 12f of the stator 12 are made to coincide with each other in the circumferential direction, first, the position of the angle 12 of the stator 12 and the compression are performed. The position of the bottom dead center of the cylinder 1 of the element 501 can be matched.

  FIG. 12 is a diagram showing the first embodiment, and is a cross-sectional view of the rotor 11 provided with a circular (small) air hole portion 11b-1 at the position of the angle α. In order to match the position of the angle α of the rotor 11 and the position of the bottom dead center of the cylinder 1, the eccentric direction of the eccentric shaft portion 50 a of the rotating shaft 50 needs to coincide with the position of the angle α of the rotor 11. . Therefore, as shown in FIG. 12, the shape of the air hole part 11b-1 in the position of the angle (alpha) of the rotor 11 is made different from the shape of the other air hole part 11b.

  Then, when the rotor 11 is fitted to the main shaft portion 50b of the rotating shaft 50 (the portion above the eccentric shaft portion 50a and fitted to the rotor 11), the eccentric shaft portion 50a of the rotating shaft 50 is eccentric. The direction is made to coincide with the position (circumferential direction) of the air hole portion 11b-1.

  With this configuration, the position of the angle α of the rotor 11 and the position of the bottom dead center of the cylinder 1 can be matched.

  The shape of the air hole at the position of the angle α of the rotor 11 may be any shape as long as it is different from the shape of the other air hole portion 11b.

  FIGS. 13 to 15 are diagrams showing the first embodiment. FIG. 13 is a cross-sectional view of the rotor 11 provided with a circular (large) air hole portion 11b-2 at the position of the angle α, and FIG. FIG. 15 is a cross-sectional view of the rotor 11 provided with the elliptical air hole portion 11b-4 at the position of the angle α.

  The shape of the air hole at the position of the angle α of the rotor 11 may be a circular (large) air hole portion 11b-2 as shown in FIG. 13 in addition to the circular (small) air hole portion 11b-1 in FIG. Good. Moreover, as shown in FIG. 14, it is good also as the square air hole part 11b-3. Furthermore, as shown in FIG. 15, it is good also as an elliptical air hole part 11b-4.

  As described above, the slots (in this example, 30 slots) of the rotor 11 of the single-phase induction motor 100 are replaced with the rotor slots 40c (for example, 4 pieces) into which the copper bars 30c are inserted, and the aluminum bars 30a. If the rotation direction of the rotor 11 is clockwise, the central portion of the four rotor slots 40c arranged in succession is formed. A position (angle α) arranged side by side at a position (counterclockwise) delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux. Further, the position of the bottom dead center of the compression element 501 of the rotary compressor 510 is made to coincide with the angle α of the rotor 11 of the single-phase induction motor 100. With such a configuration, normally, when the rotary compressor 510 stops at a balance between high and low pressures, it stops at the bottom dead center position of the compression element 501, so the above-mentioned angle of the rotor 11 at which the starting torque increases. By making the position of α substantially coincide with the bottom dead center of the compression element 501, the startability of the rotary compressor 510 can be improved.

  When the compression element 501 and the stator 12 are shrink-fitted into the hermetic container 70 when the rotary compressor 510 is assembled, the notch 1d of the cylinder 1 (the position of the bottom dead center of the outer periphery) and the stator 12 If the notch 12f is made to coincide with the circumferential direction, the position of the angle α of the stator 12 and the position of the bottom dead center of the cylinder 1 can be matched. Further, when the rotor 11 is fitted to the main shaft portion 50b of the rotating shaft 50 (the portion above the eccentric shaft portion 50a and fitted to the rotor 11), the eccentric shaft portion 50a of the rotating shaft 50 is eccentric. By making the direction coincide with the position (circumferential direction) of the air hole part 11b-1 (the air hole part 11b-2, the air hole part 11b-3, the air hole part 11b-4), the position of the angle α of the rotor 11 and The position of the bottom dead center of the cylinder 1 can be matched. As a result, the position of the angle α of the rotor 11 at which the starting torque increases and the bottom dead center of the compression element 501 can be substantially matched.

  Next, a single-phase induction motor 200 of Modification 1 will be described with reference to FIGS.

  16 to 19 show the first embodiment. FIG. 16 is a cross-sectional view of the single-phase induction motor 200 of the first modification, FIG. 17 is a cross-sectional view of the rotor 211, and FIG. 18 is a rotor core 211a. FIG. 19 is a start torque characteristic diagram with respect to the angle α.

  The single-phase induction motor 200 of Modification 1 shown in FIGS. 16 to 18 is different in the shape of the rotor 211 from the single-phase induction motor 100 shown in FIG. 1 (see FIG. 17).

  The rotor 211 has an angle α = 45 degrees (the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is downward, the direction of the main winding magnetic flux generated by the main winding 20b is rightward, and the rotor 211 rotates. When the direction is clockwise, the central part of the four rotor slots 40c arranged in succession is arranged at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux. Four rotor slots 40c (rotor slots into which the copper bars 30c are inserted) arranged side by side are also arranged side by side at positions shifted by 180 degrees. That is, a total of eight rotor slots 40c (rotor slots into which the copper bars 30c are inserted) and 22 rotor slots 40a in which the aluminum bars 30a are formed have a total of 30 rotor slots. doing.

  In addition, the starting torque characteristic diagram shown in FIG. 19 represents the starting torque ratio with respect to the angle α shown in FIG. 17 and the like, and the starting torque ratio on the vertical axis indicates that the rotor slots are all rotor slots 40a (aluminum bars 30a The ratio with respect to the starting torque is shown.

  In FIG. 19, as in FIG. 9 described above, changing the angle α changes the starting torque characteristic, and the starting torque (starting torque ratio) becomes maximum at a position where α is about 45 degrees and about 225 degrees. Yes. Compared to the characteristic diagram of FIG. 9, it can be seen that the starting torque characteristic is even greater.

  In this embodiment, the rotor slot 40c (the rotor slot into which the copper bar 30c is inserted) is also arranged at a position shifted by 180 degrees so that the angle α is at a position of about 45 degrees, thereby further starting up. A highly reliable single-phase induction motor 200 that has good torque characteristics and can be started even when the voltage of the AC power supply is low can be obtained.

  Next, a single-phase induction motor 300 of Modification 2 will be described with reference to FIGS.

  20 to 23 are diagrams showing the first embodiment, in which FIG. 20 is a cross-sectional view of a single-phase induction motor 300 of a second modification, FIG. 21 is an enlarged view of a portion B in FIG. 20, and FIG. FIG. 23 is an enlarged view and FIG. 23 is a start torque characteristic diagram with respect to the eccentric position β.

  In the single-phase induction motor 300 of Modification 2 shown in FIG. 20, the center axis (rotary axis) of the rotor 11 is the right of the center axis of the stator 12 compared to the single-phase induction motor 100 shown in FIG. 1. It is provided at a position shifted downward (eccentricity). The shape of the rotor 11 is the same as that in FIG. 1, and an asymmetrically arranged rotor comprising a rotor slot 40c (a rotor slot into which the copper bar 30c is inserted) and a rotor slot 40a (with an aluminum bar 30a formed). As shown in FIG. 1, the angle α is 45 degrees.

  In FIG. 20, when the rotor 11 rotates clockwise, if the eccentric position of the rotor 11 is set to β with respect to the downward auxiliary winding magnetic flux in the figure, the single-phase induction motor 300 shown in FIG. = 45 degrees.

  Since the rotor 11 is arranged at an eccentric position with respect to the stator 12, the gap dimension between the stator 12 and the rotor 11 is not constant. As shown in FIGS. The size in the radial direction is different between part B (FIG. 20 and enlarged view in FIG. 21) and gap 60b (part C in FIG. 20 and enlarged view in FIG. 22). For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. However, this dimension is an example and is not limited thereto.

  The starting torque characteristic shown in FIG. 23 is with respect to the eccentric position β, and the starting torque ratio on the vertical axis matches the central axis of the stator 12 shown in FIG. 1 with the central axis (rotating axis) of the rotor 11. The ratio to the starting torque when there is no eccentricity.

  In FIG. 23, the starting torque is changed by changing the eccentric position β, and the position of the eccentric position β = 45 degrees, that is, the rotor slot 40c (the rotor slot into which the copper bar 30c is inserted) is arranged. The starting torque can be further increased by decentering the rotor 11 at a certain position.

  In the example of FIG. 20, the case where the eccentric position β = 45 degrees has been described. However, if β is in the range of about 0 to 60 degrees, the single-phase induction motor 300 having good starting characteristics can be obtained.

  The improvement of the starting torque means that the single-phase induction motor 300 with high reliability that can be started even when the voltage of the AC power supply applied to the single-phase induction motor 300 becomes low can be obtained.

  FIGS. 24 to 26 are diagrams showing the first embodiment. FIG. 24 is a cross-sectional view of a single-phase induction motor 400 according to Modification 3. FIG. 25 is a cross-sectional view of a rotor 411. FIG. 26 is a rotor core 411a. FIG.

  A single-phase induction motor 400 of Modification 3 shown in FIG. 24 is different from the single-phase induction motor 100 (FIG. 1) in the rotor. The rotor 11 of the single-phase induction motor 100 has a configuration in which the copper bar 30c is inserted into a part of the rotor slot 40c. However, the rotor 411 of the single-phase induction motor 400 of Modification 3 has the rotor slot 40c. The copper bar 30d is inserted into the entire rotor slot 40d (four consecutive) corresponding to.

  The copper bar 30d is substantially similar in cross section to the rotor slot 40d, and the area of the copper bar 30d is slightly smaller than the area of the rotor slot 40d. When skew (oblique groove, twist) is applied, the gap between the rotor slot 40d and the copper bar 30d becomes large. The gap is filled with aluminum.

  Other configurations are the same as those of the single-phase induction motor 100 shown in FIG. That is, as shown in FIGS. 24 to 26, the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotor 411 When the rotation direction is clockwise, the central part of four rotor slots 40d (the copper bar 30d is inserted into the entire slot) arranged in succession is 45 with respect to the direction of the auxiliary winding magnetic flux. They are arranged side by side at a position delayed by an angle (angle α = 45 degrees). The above-described positional relationship is established when the single-phase induction motor 400 is stopped or started.

  In the rotor 411 of the single-phase induction motor 400 of Modification 3, since the copper bar 30d is inserted in the entire rotor slot 40d (four consecutive), positioning of the copper bar 30d in the rotor slot 40d is unnecessary. There is an advantage. In the rotor 11 of the single-phase induction motor 100 shown in FIG. 1, the copper bar 30c needs to be positioned in the rotor slot 40c.

  Next, a single phase induction motor 500 of Modification 4 will be described with reference to FIGS.

  27 to 29 are diagrams showing the first embodiment. FIG. 27 is a cross-sectional view of a single-phase induction motor 500 according to the fourth modification. FIG. 28 is a cross-sectional view of the rotor 511. FIG. 29 is a rotor core 511a. FIG.

  A single-phase induction motor 500 of Modification 4 shown in FIG. 27 has a rotor different from that of the single-phase induction motor 100 (FIG. 1).

  The rotor 511 has an angle α = 45 degrees (the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotor 511 is rotated. When the direction is clockwise, the central part of the four rotor slots 40d arranged continuously (copper bar 30d is inserted in the whole slot) is 45 degrees with respect to the direction of the auxiliary winding magnetic flux. Four rotor slots 40d (copper bars 30d are inserted into the entire slot) arranged in a row at four positions are arranged side by side at positions shifted by 180 degrees. That is, a total of eight rotor slots 40d (copper bars 30d are inserted in the entire slot) and a total of 22 rotor slots 40a in which the aluminum bars 30a are formed have a total of 30 rotor slots. doing.

  The starting torque characteristics of the single-phase induction motor 500 of Modification 4 are substantially the same as the characteristics shown in FIG. That is, as in FIG. 9, when the angle α is changed, the starting torque characteristic changes, and the starting torque (starting torque ratio) is maximum at a position where α is about 45 degrees and about 225 degrees. Compared to the characteristic diagram of FIG. 9, it can be seen that the starting torque characteristic is even greater.

  In this embodiment, the rotor slot 40d (the copper bar 30d is inserted in the entire slot) is also arranged at a position shifted by 180 degrees so that the angle α is at a position of about 45 degrees, thereby further starting up. A highly reliable single-phase induction motor 500 that has good torque characteristics and can be started even when the voltage of the AC power supply is low can be obtained.

  Next, a single phase induction motor 600 of Modification 5 will be described with reference to FIGS. 30 to 32.

  30 to 32 are diagrams showing the first embodiment. FIG. 30 is a cross-sectional view of the single-phase induction motor 600 according to the fifth modification, FIG. 31 is an enlarged view of a portion D in FIG. 30, and FIG. FIG.

  Compared with the single-phase induction motor 400 shown in FIG. 24, the single-phase induction motor 600 of Modification 5 shown in FIG. 30 has the center axis (rotation axis) of the rotor 411 right relative to the center axis of the stator 12. It is provided at a position shifted downward (eccentricity). The shape of the rotor 411 is the same as that in FIG. 24, and the rotor has an asymmetrical arrangement including a rotor slot 40d (a copper bar 30d is inserted in the entire slot) and a rotor slot 40a (an aluminum bar 30a is formed). As shown in FIG. 24, the angle α is 45 degrees.

  In FIG. 30, when the rotor 411 rotates clockwise, if the eccentric position of the rotor 411 is set to β with respect to the downward auxiliary winding magnetic flux in the drawing, the single-phase induction motor 600 shown in FIG. = 45 degrees.

  Since the rotor 411 is arranged at an eccentric position with respect to the stator 12, the gap dimension between the stator 12 and the rotor 411 is not constant, and as shown in FIGS. 31 and 32, the gap 60a (D part of FIG. 30 and an enlarged view are shown in FIG. 31) and the radial dimension of the space | gap 60b (E part of FIG. 30, an enlarged view is shown in FIG. 32) differ. For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. However, this dimension is an example and is not limited thereto.

  The starting torque characteristic of the single phase induction motor 600 is substantially equal to the starting torque characteristic shown in FIG. 23, the starting torque is changed by changing the eccentric position β, and the eccentric position β = 45 degrees, that is, the rotor slot 40c (the rotor slot into which the copper bar 30c is inserted). The starting torque can be further increased by decentering the rotor 11 at the arranged position.

  The improvement of the starting torque means that the single-phase induction motor 600 with high reliability that can be started even when the voltage of the AC power supply applied to the single-phase induction motor 600 becomes low can be obtained.

  Next, a single phase induction motor 700 of Modification 6 will be described with reference to FIGS.

  FIGS. 33 to 37 are diagrams showing the first embodiment. FIG. 33 is a transverse sectional view of a single-phase induction motor 700 according to the modified example 6. FIG. 34 is a transverse sectional view of a rotor 711. FIG. FIG. 36 is a cross-sectional view of the rotor core 711a, and FIG. 37 is an enlarged cross-sectional view of the rotor slots 740a and 740c.

  A single-phase induction motor 700 of Modification 6 shown in FIG. 33 is different from the single-phase induction motor 100 (FIG. 1) in the rotor. The rotor 11 of the single-phase induction motor 100 (FIG. 1) has a normal cage shape, but the rotor 711 of the single-phase induction motor 700 of the modification 6 has a double cage shape.

  A single-phase induction motor 700 of Modification 6 includes a stator 12 and a rotor 711. The stator 12 is the same as that of the single-phase induction motor 100 (FIG. 1). The rotor 711 includes a rotor core 711a and a double squirrel-cage conductor.

  A rotor slot 740a (a slot in which an aluminum bar is formed) provided along the outer peripheral edge of the rotor core 711a and a rotor slot 740c (a copper bar are inserted) on the outer periphery in the radial direction of the rotor core 711a. Slot). However, the rotor slot 740a and the rotor slot 740c have the same shape (see FIG. 37).

  In the example of FIG. 33 (FIG. 36), the number of rotor slots is 26 for the rotor slots 740a (slots where aluminum bars are formed) and 4 for the rotor slots 740c (slots where copper bars are inserted). There are 30 in total. As a result, the single-phase induction motor 700 of FIG. 33 is a combination in which the number of slots of the stator core 12a is 24 and the total number of slots of the rotor core 711a is 30.

  In the rotor slot 740a, aluminum which is a conductive material is cast (aluminum die casting) to form an aluminum bar 730a (see FIG. 34). The aluminum bar 730a includes an outer aluminum bar 730a-1, an inner aluminum bar 730a-2, and a connecting aluminum bar 730a-3. The conductive material is generally aluminum, but copper may also be used.

  Moreover, although aluminum which is an electroconductive material is cast also in the rotor slot 740c, a copper bar is inserted in addition to aluminum. An aluminum bar 730c with a copper bar is formed in the rotor slot 740c.

  As shown in FIG. 35 (a), in the aluminum bar 730c with a copper bar, the copper bar 730c-1 is inserted into the inner layer slot 740a-2. Further, aluminum is cast into the inner layer slot 740a-2 to form an inner layer aluminum bar 730a-2. In the inner layer slot 740a-2, the copper bar 730c-1 and the inner layer aluminum bar 730a-2 exist. As with the rotor slot 740a, the outer layer slot 740a-1 of the rotor slot 740c is cast with aluminum to form an outer layer aluminum bar 730a-1. Also, aluminum is cast into the connection slot 740a-3 to form a connection aluminum bar 730a-3.

  As shown in FIG. 35 (b), the aluminum bar 730a is formed by casting only aluminum into the outer layer slot 740a-1, the inner layer slot 740a-2, and the connecting slot 740a-3 of the rotor slot 740a. 730a-1, an inner layer aluminum bar 730a-2, and a connection aluminum bar 730a-3 are formed.

  The aluminum bar 730a and the copper bar-containing aluminum bar 730c form a double squirrel-cage secondary conductor together with end rings 32 (see FIG. 9) provided on both end surfaces of the rotor 711 in the stacking direction.

  The rotor slots 740a and 740c include an outer layer slot 740a-1 provided along the outer peripheral edge of the rotor core 711a, an inner layer slot 740a-2 provided on the inner peripheral side of the outer layer slot 740a-1, and an outer layer slot 740a. -1 and a connecting slot 740a-3 connecting the inner layer slot 740a-2 (see FIG. 37). Aluminum is also cast into the connection slot 740a-3.

  As shown in FIGS. 33 and 34, the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotation direction of the rotor 711 Is clockwise, the central portions of the four rotor slots 740c arranged in succession are arranged at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux (angle α = 45 degrees).

  A single-phase induction motor 700 having a double cage rotor 711 has the following general characteristics. In other words, the slip frequency (the difference between the frequency of the rotating magnetic field and the number of rotations of the rotor 711) increases at the time of startup. The leakage flux of the inner layer aluminum bar (for example, inner layer aluminum bar 730a-2) is larger than the leakage flux of the outer layer aluminum bar (for example, outer layer aluminum bar 730a-1). At start-up with a high slip frequency, the current distribution is determined by the reactance, and the secondary current flows mainly to the outer aluminum bar (for example, outer aluminum bar 730a-1). Therefore, when the secondary resistance is increased, the starting torque is increased and the starting characteristics are improved.

  During normal operation, since the slip frequency is low, the secondary current flows through the entire aluminum bar, so that the aluminum cross-sectional area increases and the secondary resistance decreases. Therefore, the secondary copper loss is reduced, and thus the efficiency can be improved.

  In addition, as shown in FIGS. 33 and 34, the single-phase induction motor 700 of Modification 6 has the auxiliary winding magnetic flux generated by the auxiliary winding 20a facing downward and generated by the main winding 20b. When the direction of the main winding magnetic flux is rightward and the rotation direction of the rotor 711 is clockwise, the central portion of the four rotor slots 740c arranged in succession is set with respect to the direction of the auxiliary winding magnetic flux. Since they are arranged side by side at a position delayed by 45 degrees (angle α = 45 degrees), the starting torque characteristics shown in FIG. 9 are provided, and the starting torque characteristics are further improved.

  Next, a single phase induction motor 800 of Modification 7 will be described with reference to FIGS. 38 to 40.

  38 to 40 are diagrams showing the first embodiment. FIG. 38 is a cross-sectional view of a single-phase induction motor 800 according to Modification 7. FIG. 39 is a cross-sectional view of a rotor 811. FIG. 40 is a rotor core 811a. FIG.

  The single-phase induction motor 800 of Modification 7 shown in FIGS. 38 to 40 is different in the shape of the rotor 811 from the single-phase induction motor 700 of Modification 6 shown in FIG. 33 (see FIG. 39).

  The rotor 811 has an angle α = 45 degrees (the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotation of the rotor 811 is performed. When the direction is clockwise, the central part of the four continuously arranged rotor slots 740c is arranged at a position 45 degrees behind the direction of the auxiliary winding magnetic flux). Four rotor slots 740c arranged side by side (rotor slots into which the copper bars 730c-1 are inserted) are arranged side by side at positions shifted by 180 degrees. That is, a total of eight rotor slots 740c (rotor slots into which copper bars 730c-1 are inserted) and a total of 22 rotor slots 740a in which aluminum bars 730a are formed, a total of 30 rotor slots. have.

  The starting torque characteristic of the single-phase induction motor 800 of Modification 7 is substantially the same as the starting torque characteristic shown in FIG.

  In FIG. 19, as in FIG. 9 described above, changing the angle α changes the starting torque characteristic, and the starting torque (starting torque ratio) becomes maximum at a position where α is about 45 degrees and about 225 degrees. Yes. Compared to the characteristic diagram of FIG. 9, it can be seen that the starting torque characteristic is even greater.

  In this embodiment, by arranging the rotor slot 740c (rotor slot into which the copper bar 730c-1 is inserted) at a position shifted by 180 degrees so that the angle α is at a position of about 45 degrees, In addition, it is possible to obtain a highly reliable single-phase induction motor 800 that has good starting torque characteristics and can start even when the voltage of the AC power supply is low.

  Next, a single-phase induction motor 900 according to Modification 8 will be described with reference to FIGS. 41 to 43.

  41 to 43 are diagrams showing the first embodiment. FIG. 41 is a cross-sectional view of the single-phase induction motor 900 according to the modified example 8. FIG. 42 is an enlarged view of a portion G in FIG. FIG.

  In the single-phase induction motor 900 of Modification 8 shown in FIG. 41, the center axis (rotation axis) of the rotor 711 is right relative to the center axis of the stator 12 as compared to the single-phase induction motor 700 shown in FIG. It is provided at a position shifted downward (eccentricity). The shape of the rotor 711 is the same as that in FIG. 33, and the rotor slot has an asymmetrical arrangement including a rotor slot 740c (a copper bar 730c-1 is inserted) and a rotor slot 740a (an aluminum bar 730a is formed). As shown in FIG. 33, the angle α is 45 degrees.

  41, when the rotor 711 rotates clockwise, if the eccentric position of the rotor 711 is set to β with respect to the downward auxiliary winding magnetic flux in the figure, the single-phase induction motor 900 shown in FIG. = 45 degrees.

  Since the rotor 711 is arranged at an eccentric position with respect to the stator 12, the gap dimension between the stator 12 and the rotor 711 is not constant, and as shown in FIGS. 42 and 43, the gap 60a (The G part of FIG. 41 and an enlarged view are shown in FIG. 42) and the radial dimension of the space | gap 60b (H part of FIG. 41, and an enlarged view are shown in FIG. 43) differ. For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. However, this dimension is an example and is not limited thereto.

  The starting torque characteristic of the single phase induction motor 900 is substantially equal to the starting torque characteristic shown in FIG. 23, the starting torque is changed by changing the eccentric position β, and the position of the eccentric position β = 45 degrees, that is, the rotor slot 740c (the copper bar 730c-1 is inserted) is arranged. The starting torque can be further increased by decentering the rotor 711 at the position.

  The improvement of the starting torque means that a reliable single-phase induction motor 900 that can be started even when the voltage of the AC power supply applied to the single-phase induction motor 900 becomes low can be obtained.

  Next, a single-phase induction motor 1000 of Modification 9 will be described with reference to FIGS. 44 to 46.

  44 to 46 are diagrams showing the first embodiment. FIG. 44 is a cross-sectional view of a single-phase induction motor 1000 according to the modification 9. FIG. 45 is a cross-sectional view of the rotor 1011. FIG. 46 is a rotor core 1011a. FIG.

  The single-phase induction motor 1000 of Modification 9 shown in FIG. 44 has a double squirrel rotor as in the single-phase induction motor 700 (FIG. 33). However, the rotor 711 of the single-phase induction motor 700 has a configuration in which the copper bar 730c-1 is inserted into a part of the rotor slot 740c, but the rotor 1011 of the single-phase induction motor 1000 of Modification 9 is Copper bars 730d are inserted into the entire rotor slot 740d (four consecutive) corresponding to the rotor slot 740c.

  The copper bar 730d is substantially similar in cross section to the rotor slot 740d, and the area of the copper bar 730d is slightly smaller than the area of the rotor slot 740d. When skew (oblique groove, twist) is applied, the gap between the rotor slot 740d and the copper bar 730d becomes large. The gap is filled with aluminum.

  Other configurations are the same as those of the single-phase induction motor 700 shown in FIG. That is, as shown in FIGS. 44 to 46, the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotor 1011 When the rotation direction is clockwise, the central portion of the four rotor slots 740d arranged in succession (the copper bar 730d is inserted in the entire slot) is positioned at 45 with respect to the direction of the auxiliary winding magnetic flux. They are arranged side by side at a position delayed by an angle (angle α = 45 degrees). The above-described positional relationship is established when the single-phase induction motor 1000 is stopped or started.

  In the rotor 1011 of the single-phase induction motor 1000 according to the modified example 9, the copper bar 730d is inserted into the entire rotor slot 740d (four consecutive), so positioning of the copper bar 730d in the rotor slot 740d is unnecessary. There is an advantage. In the rotor 711 of the single-phase induction motor 700 shown in FIG. 33, it is necessary to position the copper bar 730c-1 in the rotor slot 740c.

  Next, a single phase induction motor 1100 of Modification 10 will be described with reference to FIGS. 47 to 49.

  47 to 49 show the first embodiment. FIG. 47 is a cross-sectional view of a single-phase induction motor 1100 according to a tenth modification, FIG. 48 is a cross-sectional view of a rotor 1111, and FIG. 49 is a rotor core 1111 a. FIG.

  The single-phase induction motor 1100 of Modification 10 shown in FIGS. 47 to 49 is different in the shape of the rotor 1111 from the single-phase induction motor 1000 of Modification 9 shown in FIG. 44 (see FIG. 48).

  The rotor 1111 has an angle α = 45 degrees (the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is downward, the direction of the main winding magnetic flux generated by the main winding 20b is rightward, and the rotor 1111 rotates. When the direction is clockwise, the central part of the four continuously arranged rotor slots 740d is arranged at a position 45 degrees behind the direction of the auxiliary winding magnetic flux). Four rotor slots 740d arranged side by side (copper bar 730d is inserted in the entire slot) are arranged side by side at positions shifted by 180 degrees. In other words, a total of eight rotor slots 740d (copper bars 730d are inserted in the entire slot) and 22 rotor slots 740a in which aluminum bars 730a are formed have a total of 30 rotor slots. doing.

  The starting torque characteristic of the single phase induction motor 1100 of the modification 10 is substantially the same as the starting torque characteristic shown in FIG.

  In FIG. 19, as in FIG. 9 described above, changing the angle α changes the starting torque characteristic, and the starting torque (starting torque ratio) becomes maximum at a position where α is about 45 degrees and about 225 degrees. Yes. Compared to the characteristic diagram of FIG. 9, it can be seen that the starting torque characteristic is even greater.

  In this embodiment, the rotor slot 740d (the copper bar 730d is inserted into the entire slot) is also arranged at a position shifted by 180 degrees so that the angle α is at a position of about 45 degrees, thereby further starting up. A highly reliable single-phase induction motor 1100 that has good torque characteristics and can be started even when the voltage of the AC power supply is low can be obtained.

  Next, a single phase induction motor 1200 of Modification 11 will be described with reference to FIGS. 50 to 52.

  50 to 52 are diagrams showing the first embodiment. FIG. 50 is a cross-sectional view of the single-phase induction motor 1200 according to the eleventh modification. FIG. 51 is an enlarged view of a portion I in FIG. FIG.

  Compared with the single-phase induction motor 1000 shown in FIG. 44, the single-phase induction motor 1200 of Modification 11 shown in FIG. 50 has the center axis (rotary axis) of the rotor 1011 to the right of the center axis of the stator 12. It is provided at a position shifted downward (eccentricity). The shape of the rotor 1011 is the same as that in FIG. 44, and is an asymmetrically arranged rotor including a rotor slot 740d (a copper bar 730d is inserted in the entire slot) and a rotor slot 740a (an aluminum bar 730a is formed). As shown in FIG. 44, the angle α is 45 degrees.

  50, when the rotor 1011 rotates clockwise, if the eccentric position of the rotor 1011 is set to β with respect to the downward auxiliary winding magnetic flux in the drawing, the single-phase induction motor 900 shown in FIG. = 45 degrees.

  Since the rotor 1011 is arranged at an eccentric position with respect to the stator 12, the gap dimension between the stator 12 and the rotor 1011 is not constant. As shown in FIGS. 42 and 43, the gap 60a (The G part of FIG. 41 and an enlarged view are shown in FIG. 42) and the radial dimension of the space | gap 60b (H part of FIG. 41, an enlarged view is shown in FIG. 43) differ. For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. However, this dimension is an example and is not limited thereto.

  The starting torque characteristic of the single phase induction motor 1200 is substantially the same as the starting torque characteristic shown in FIG. 23, the starting torque is changed by changing the eccentric position β, and the position of the eccentric position β = 45 degrees, that is, the rotor slot 740c (the copper bar 730c-1 is inserted) is arranged. The starting torque can be further increased by decentering the rotor 1011 at the position.

  The improvement of the starting torque means that a highly reliable single-phase induction motor 1200 that can be started even when the voltage of the AC power supply applied to the single-phase induction motor 1200 is low can be obtained.

  Next, a single phase induction motor 1300 of Modification 12 will be described with reference to FIGS. 53 to 57.

  53 to 57 are diagrams showing the first embodiment. FIG. 53 is a cross-sectional view of a single-phase induction motor 1300 according to the twelfth modification. FIG. 54 is an enlarged view of a portion K in FIG. 56 is a cross-sectional view of the rotor core 1311a, FIG. 57 (a) is a cross-sectional view of the rotor large slot 40f, and FIG. 57 (b) is a cross-sectional view of the rotor small slot 40e.

  In the single-phase induction motors 100 to 1200 described so far, the rotor slots (for example, the rotor slots 40a and 40c) have the same shape. The rotor slot of the single-phase induction motor 1300 of the modification 12 is characterized in that the rotor slot into which the copper bar is inserted has a larger area than the other rotor slots. This is effective when the cross-sectional area (weight) of the copper bar cannot be increased for some reason (for example, rotor unbalance due to the difference in specific gravity between copper and aluminum).

  A single-phase induction motor 1300 of Modification 12 includes a stator 12 and a rotor 1311 provided on the inner peripheral side of the stator 12 via a gap 60 (see FIG. 54).

  Since the stator 12 is the same as that of the single-phase induction motor 100, description thereof is omitted.

  The rotor 1311 includes a rotor core 1311a, a cage-shaped secondary conductor (a bar (for example, an aluminum bar or an aluminum bar into which a copper bar is inserted)), and an end ring 32 (see FIG. 8). . For example, the gap 60 between the stator 12 and the rotor 1311 has a radial dimension of about 0.2 to 2.0 mm.

  As with the stator core 12a, the rotor core 1311a is an electromagnetic steel sheet having a thickness of 0.1 to 1.5 mm (for example, a non-oriented electrical steel sheet ( The crystal axis direction of the crystal is randomly arranged as much as possible))) is punched into a predetermined shape and laminated in the axial direction. Usually, the electromagnetic steel sheet of the inner side (inner peripheral side) of the stator core 12a is used.

  In general, the rotor core 1311a is often punched from the same material as the stator core 12a, but the rotor core 1311a may be made of a material different from that of the stator core 12a.

  The rotor core 1311a has a rotor slot including a rotor small slot 40e provided along the outer peripheral edge of the rotor core 1311a and a rotor large slot 40f on the outer peripheral side in the radial direction.

  In the example of FIG. 53 (FIG. 56), the number of rotor slots is 26 for the small rotor slot 40e (see FIG. 57 (b)) and 4 for the large rotor slot 40f (see FIG. 57 (a)). There are 30 in total. As a result, the single-phase induction motor 1300 of FIG. 53 is a combination in which the number of slots of the stator core 12a is 24 and the total number of slots of the rotor core 1311a is 30. However, this is an example, and the combination of the number of slots of the stator core 12a and the number of slots of the rotor core 1311a is not limited to this.

  Aluminum, which is a conductive material, is cast in the rotor small slot 40e (aluminum die casting) to form an aluminum bar 30e (see FIG. 55).

  First, a copper bar 30g having a substantially circular cross section is inserted into the large rotor slot 40f. Thereafter, aluminum as a conductive material is cast (aluminum die casting), an aluminum bar 30f is formed, and the copper bar 30g is fixed (see FIG. 55). The copper bar 30g may not have a substantially circular cross-sectional shape. Further, the position of the copper bar 30g in the rotor large slot 40f is on the outer peripheral side of the rotor core 1311a in FIG. 55, but the position is not limited.

  The aluminum bars 30e (26 pieces) and the aluminum bars 30f (four pieces) into which the copper bars 30g are inserted are cage-shaped secondary conductors with end rings 32 (see FIG. 8) provided on both end surfaces of the rotor 1311 in the stacking direction. Form.

  As shown in FIG. 53, the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is downward, the direction of the main winding magnetic flux generated by the main winding 20b is rightward, and the rotation direction of the rotor 1311 is clockwise. In this case, the central portions of the four rotor large slots 40f arranged in succession are arranged side by side at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux (angle α = 45 degrees). ). The above-described positional relationship is established when the single-phase induction motor 1300 is stopped or started.

  The starting torque characteristic of the single phase induction motor 1300 is substantially the same as the starting torque characteristic shown in FIG.

  In FIG. 9, when the angle α is changed, the starting torque characteristic changes, and the starting torque (starting torque ratio) becomes maximum when α is about 45 degrees and about 225 degrees, and α is about 135 degrees and about 315. It can be seen that the starting torque (starting torque ratio) is minimized at the position of degrees. Since it is a two-pole single-phase induction motor 1300, it has periodicity every 180 degrees.

  In the case of a single-phase induction motor, the main winding electric current flowing through the main winding 20b is much larger than the auxiliary winding current flowing through the auxiliary winding 20a at the time of start-up, that is, generated by the auxiliary winding 20a. The main winding magnetic flux generated by the main winding 20b is larger than the auxiliary winding magnetic flux, and the dipolar rotating magnetic field composed of the combined magnetic fields tends to be an elliptical magnetic field close to an alternating magnetic field.

  Due to the influence of the elliptical magnetic field, the rotor slot is asymmetrically formed by the rotor large slot 40f and the rotor small slot 40e, and an aluminum bar 30e (see FIG. 55) is formed in the rotor small slot 40e. By forming the aluminum bar 30f together with the copper bar 30g in the rotor large slot 40f, the starting torque characteristic with respect to the angle α changes as shown in FIG.

  In the present embodiment, by arranging the rotor large slot 40f so that the angle α is at a position of about 45 degrees, it is possible to obtain a highly reliable single-phase induction motor 1300 with good starting torque characteristics. it can.

  As shown in FIG. 9, the starting torque (starting torque ratio) is maximized at a position where the angle α is about 45 degrees, which shows the best starting characteristics. Thus, it is possible to obtain good starting characteristics.

  As described above, since the starting torque characteristic has a periodicity of 180 degrees, even if the angle α is set in the range of 200 to 250 degrees, the same characteristic is exhibited.

  Further, the starting torque is improved by arranging the rotor slots asymmetrically. However, if the starting torque is equivalent to that of the rotor slots having the same shape, the stator core 12a and the rotor core 1311a are stacked. It is possible to reduce the number of sheets (lamination thickness).

  When the number of laminated stator cores 12a and rotor cores 1311a is reduced, the amount of electromagnetic steel sheets used is reduced, and the amount of windings used is reduced as the peripheral lengths of the main winding 20b and auxiliary winding 20a are reduced. Thus, a low-cost single-phase induction motor 1300 can be obtained. Furthermore, a lightweight single-phase induction motor 1300 can be obtained by reducing the amount of use of electromagnetic steel sheets and windings.

  The rotor core 1311a shown in FIG. 55 is larger in area than the small rotor slot 40e by increasing the width of the large rotor slot 40f in the circumferential direction. May be increased.

  58 to 60 show the first embodiment. FIG. 58 is a cross-sectional view of the rotor 1311 provided with a large rotor slot 40h in the radial direction, and FIG. 59 shows a rotor large slot 40h that is long in the radial direction. 60A is a cross-sectional view of the rotor large slot 40h, and FIG. 60B is a cross-sectional view of the rotor small slot 40e.

  A rotor 1311 shown in FIG. 58 has a rotor slot including a rotor small slot 40e and a rotor large slot 40h provided along the outer peripheral edge of the rotor core 1311a on the radially outer peripheral side of the rotor core 1311a. Have.

  In the example of FIG. 58, the number of rotor slots is 26 for the small rotor slot 40e (see FIG. 60B) and 4 for the large rotor slot 40h (see FIG. 60A). 30.

  The rotor large slot 40f (see FIG. 57A) has a larger area in the circumferential direction than the rotor small slot 40e, but the rotor large slot 40h (see FIG. 60A) is a rotor. The area is expanded in the radial direction with respect to the small slot 40e.

  Aluminum, which is a conductive material, is cast in the rotor small slot 40e (aluminum die casting) to form an aluminum bar 30e (see FIG. 58).

  First, a copper bar 30g having a substantially circular cross section is inserted into the large rotor slot 40h. Thereafter, aluminum which is a conductive material is cast (aluminum die casting), an aluminum bar 30f is formed, and the copper bar 30g is fixed (see FIG. 58). The copper bar 30g may not have a substantially circular cross-sectional shape. Further, the position of the copper bar 30g in the rotor large slot 40h is on the outer peripheral side of the rotor core 1311a in FIG. 58, but the position is not limited.

  Even with the configuration as shown in FIG. 58, characteristics substantially equivalent to the starting torque characteristics shown in FIG. 9 can be obtained.

  Next, a single phase induction motor 1400 of Modification 13 will be described with reference to FIGS. 61 to 63.

  61 to 63 are diagrams showing the first embodiment. FIG. 61 is a cross-sectional view of a single-phase induction motor 1400 according to a modification 13. FIG. 62 is a cross-sectional view of a rotor 1411. FIG. 63 is a rotor core 1411a. FIG.

  The single-phase induction motor 1400 of Modification 13 shown in FIGS. 61 to 63 is different in the shape of the rotor 1411 from the single-phase induction motor 1300 shown in FIG. 53 (see FIG. 62).

  The rotor 1411 has an angle α = 45 degrees (the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotor 1411 rotates. When the direction is clockwise, the central part of the four rotor large slots 40f arranged in succession is arranged at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux). Four large rotor slots 40f arranged side by side (rotor slots into which copper bars 30g are inserted) are arranged side by side at positions shifted by 180 degrees. That is, the rotor large slots 40f (rotor slots into which the copper bars 30g are inserted) are 8 in total and the rotor small slots 40e in which the aluminum bars 30e are formed are 22 in total, for a total of 30 rotor slots. have.

  The starting torque characteristic of the single-phase induction motor 1400 of the modification 13 is substantially the same as the starting torque characteristic shown in FIG.

  In FIG. 19, as in FIG. 9 described above, changing the angle α changes the starting torque characteristic, and the starting torque (starting torque ratio) becomes maximum at a position where α is about 45 degrees and about 225 degrees. Yes. Compared to the characteristic diagram of FIG. 9, it can be seen that the starting torque characteristic is even greater.

  In the present embodiment, the rotor large slot 40f (rotor slot into which the copper bar 30g is inserted) is also arranged at a position shifted by 180 degrees so that the angle α is at a position of about 45 degrees. A highly reliable single-phase induction motor 1400 that has good starting torque characteristics and can be started even when the voltage of the AC power supply is low can be obtained.

  64 and 65 show the first embodiment. FIG. 64 is a cross-sectional view of the rotor 1411 provided with a large rotor slot 40h in the radial direction. FIG. 65 shows a large rotor slot 40h in the radial direction. It is a cross-sectional view of the rotor core 1411a provided with

  Also in the single-phase induction motor 1400 of the modified example 13, the large rotor slot may have a shape that is longer not only in the circumferential direction but also in the radial direction than the small rotor slot 40e.

  A rotor 1411 shown in FIG. 64 includes a rotor small slot 40e provided along the outer peripheral edge of the rotor core 1411a on the radially outer peripheral side of the rotor core 1411a (FIG. 65), and a rotor large in the radial direction. It has a rotor slot consisting of a slot 40h.

  64 and 65, the number of rotor slots is 22 for the small rotor slot 40e (see FIG. 60B) and 8 for the large rotor slot 40h (see FIG. 60A). There are 30 in total.

  Even with the configuration as shown in FIG. 64, characteristics substantially equivalent to the starting torque characteristics shown in FIG. 23 can be obtained.

  Next, a single-phase induction motor 1500 of Modification 14 will be described with reference to FIGS. 66 to 68. FIG.

  66 to 68 are diagrams showing the first embodiment. FIG. 66 is a cross-sectional view of the single-phase induction motor 1500 according to the modified example 14. FIG. 67 is an enlarged view of a portion L in FIG. 66. FIG.

  66, the single-phase induction motor 1500 according to the modified example 14 has a central axis (rotary axis) of the rotor 1311 that is the right of the central axis of the stator 12 as compared to the single-phase induction motor 1300 shown in FIG. It is provided at a position shifted downward (eccentricity). The shape of the rotor 1311 is the same as that shown in FIG. 53, and has an asymmetrical arrangement composed of a large rotor slot 40f (a rotor slot into which a copper bar 30g is inserted) and a small rotor slot 40e (an aluminum bar 30e is formed). As shown in FIG. 53, the angle α is 45 degrees.

  66, when the rotor 1311 rotates clockwise, when the eccentric position of the rotor 1311 is set to β with respect to the downward auxiliary winding magnetic flux in the figure, the single-phase induction motor 1500 shown in FIG. β = 45 degrees.

  Since the rotor 1311 is arranged at an eccentric position with respect to the stator 12, the gap dimension between the stator 12 and the rotor 1311 is not constant. As shown in FIGS. 67 and 68, the gap 60a The radial dimension is different between the L portion in FIG. 66 and an enlarged view in FIG. 67 and the gap 60b (M portion in FIG. 66 and an enlarged view in FIG. 68). For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. However, this dimension is an example and is not limited thereto.

  The starting torque characteristic of the single phase induction motor 1500 of the modification 14 is substantially the same as the starting torque characteristic shown in FIG.

  In FIG. 23, the starting torque is changed by changing the eccentric position β, and the position of the eccentric position β = 45 degrees, that is, the rotor slot 40c (the rotor slot into which the copper bar 30c is inserted) is arranged. The starting torque can be further increased by decentering the rotor 1311 at the predetermined position.

  In the example of FIG. 66, the case where the eccentric position β = 45 degrees has been described. However, if β is in the range of about 0 to 60 degrees, the single-phase induction motor 300 having good starting characteristics can be obtained.

  The improvement of the starting torque means that a reliable single-phase induction motor 1500 that can be started even when the voltage of the AC power supply applied to the single-phase induction motor 1500 is low can be obtained.

  Next, a single phase induction motor 1600 of Modification 15 will be described with reference to FIGS.

  69 to 71 are diagrams showing the first embodiment. FIG. 69 is a cross-sectional view of a single-phase induction motor 1600 according to a modification 15. FIG. 70 is an enlarged view of a portion N in FIG. 69. FIG.

  The single-phase induction motor 1600 of Modification 15 provided with a large rotor large slot 40h in the radial direction shown in FIG. 69 differs from the single-phase induction motor 1500 shown in FIG. 66 in the shape of the large rotor slot. In the single-phase induction motor 1500 shown in FIG. 66, the rotor large slot 40h has a larger width in the circumferential direction than the rotor small slot 40e. However, the rotor large slot 40h that is long in the radial direction shown in FIG. In the single-phase induction motor 1600 of the modified example 15, the rotor large slot 40h is longer in the radial direction than the rotor small slot 40e.

  As described above, the rotor large slot 40h having a radial length longer than that of the rotor small slot 40e is used, and the rotor 1311 is arranged eccentrically with respect to the stator 12. The gap dimension between 1311 is not constant, and as shown in FIGS. 70 and 71, the gap 60a (N portion in FIG. 69, an enlarged view is shown in FIG. 70) and the gap 60b (P portion in FIG. 69, FIG. 71). (The enlarged view is shown in Fig. 2). For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. Even in such a configuration, a starting torque characteristic substantially equivalent to the starting torque characteristic shown in FIG. 29 can be obtained.

  Next, a single phase induction motor 1700 of Modification 16 will be described with reference to FIGS. 72 to 77.

  72 to 77 are diagrams showing the first embodiment. FIG. 72 is a cross-sectional view of a single-phase induction motor 1700 according to a modification 16. FIG. 73 is a cross-sectional view of a rotor 1711. FIG. FIG. 75 is a cross-sectional view of the aluminum bar 730a, FIG. 76 is a cross-sectional view of the rotor core 1711a, and FIG. 77 (a) is a large rotor slot 740f. FIG. 77B is a transverse sectional view of the rotor small slot 740a-0.

  In the single-phase induction motor 1700 of Modification 16 shown in FIG. 72, the rotor 1711 has a double squirrel cage shape, similarly to the single-phase induction motor 700 of Modification 6 shown in FIG.

  A single-phase induction motor 1700 of Modification 16 includes a stator 12 and a rotor 1711. The stator 12 is the same as that of the single-phase induction motor 100 (FIG. 1). The rotor 1711 includes a rotor iron core 1711a and a double squirrel-cage conductor.

  The rotor core 1711a has a small rotor slot 740a-0 (a slot in which an aluminum bar is formed) and a large rotor slot 740f (copper bar) provided along the outer peripheral edge of the rotor core 1711a on the radially outer peripheral side. Are inserted).

  The rotor large slot 740f (the slot into which the copper bar is inserted) has a larger area than the rotor small slot 740a-0 (the slot in which the aluminum bar is formed). The rotor large slot 740f is longer in the circumferential direction than the rotor small slot 740a-0.

  As shown in FIG. 77 (a), the rotor large slot 740f includes an outer layer slot 740f-1 provided along the outer peripheral edge of the rotor core 1711a and an inner layer slot provided on the inner peripheral side of the outer layer slot 740f-1. 740f-2 and a connection slot 740f-3 connecting the outer layer slot 740f-1 and the inner layer slot 740f-2.

  As shown in FIG. 74, a copper bar-containing aluminum bar 730f is formed in the rotor large slot 740f. That is, the outer layer aluminum bar 730f-1 is formed in the outer layer slot 740f-1, and the copper bar 730g-1 is inserted and the inner layer aluminum bar 730f-2 is formed in the inner layer slot 740f-2. Aluminum is also cast into the connection slot 740f-3 to form a connection aluminum bar 730f-3.

  In addition, as shown in FIG. 77 (b), the rotor small slot 740a-0 includes an outer layer slot 740a-1 provided along the outer peripheral edge of the rotor core 1711a and an inner peripheral side of the outer layer slot 740a-1. The inner layer slot 740a-2 is provided, and the outer layer slot 740a-1 is connected to the inner layer slot 740a-2.

  Only aluminum is cast into the rotor small slot 740a-0. The outer layer aluminum bar 730a-1 is formed in the outer layer slot 740a-1, and the inner layer aluminum bar 730a-2 is formed in the inner layer slot 740a-2. Aluminum is also cast into the connection slot 740a-3 to form a connection aluminum bar 730a-3 (see FIG. 75).

  In the example of FIG. 72 (FIG. 76), the number of rotor slots is 26 small rotor slots 740a-0 (slots where aluminum bars are formed) and large rotor slots 740f (slots where copper bars are inserted). ) Is 4, and 30 in total. As a result, the single-phase induction motor 1700 of FIG. 72 is a combination in which the number of slots of the stator core 12a is 24 and the total number of slots of the rotor core 1711a is 30.

  The aluminum bars 730a (26 pieces) and the copper bars-containing aluminum bars 730f (four pieces) form a double squirrel-cage secondary conductor together with the end rings 32 (see FIG. 9) provided on both end surfaces of the rotor 1711 in the stacking direction. To do.

  72 and 73, the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotation direction of the rotor 1711 , The central part of the four rotor large slots 740f arranged in succession is arranged at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux (angle α = 45 degrees).

  A single-phase induction motor 1700 having a double cage rotor 1711 has the following general characteristics. In other words, the slip frequency (the difference between the frequency of the rotating magnetic field and the number of rotations of the rotor 1711) becomes high at the time of startup. The leakage flux of the inner layer aluminum bar (for example, inner layer aluminum bar 730a-2) is larger than the leakage flux of the outer layer aluminum bar (for example, outer layer aluminum bar 730a-1). At start-up with a high slip frequency, the current distribution is determined by the reactance, and the secondary current flows mainly to the outer aluminum bar (for example, outer aluminum bar 730a-1). Therefore, when the secondary resistance is increased, the starting torque is increased and the starting characteristics are improved.

  During normal operation, since the slip frequency is low, the secondary current flows through the entire aluminum bar, so that the aluminum cross-sectional area increases and the secondary resistance decreases. Therefore, the secondary copper loss is reduced, and thus the efficiency can be improved.

  In addition, as shown in FIGS. 72 and 73, the single-phase induction motor 1700 of Modification 16 has the auxiliary winding magnetic flux generated by the auxiliary winding 20a facing downward and generated by the main winding 20b. When the direction of the main winding magnetic flux is rightward and the rotation direction of the rotor 1711 is clockwise, the central portion of the four rotor large slots 740f arranged in succession with respect to the direction of the auxiliary winding magnetic flux. 9 are arranged side by side at a position delayed by 45 degrees (angle α = 45 degrees), so that the starting torque characteristic shown in FIG. 9 is provided and the starting torque characteristic is further improved.

  Next, a single phase induction motor 1800 of Modification 17 will be described with reference to FIGS. 78 to 82.

  78 to 82 are diagrams showing the first embodiment. FIG. 78 is a transverse sectional view of a single-phase induction motor 1800 according to the modified example 17. FIG. 79 is a transverse sectional view of a rotor 1811. FIG. FIG. 81 is a cross-sectional view of the rotor core 1811a, FIG. 82 (a) is a cross-sectional view of the rotor large slot 740h, and FIG. 82 (b) is a cross-sectional view of the aluminum bar 730h containing copper bars. It is a cross-sectional view of the rotor small slot 740a-0.

  78, the single-phase induction motor 1800 of the modified example 17 shown in FIG. 78 is similar to the single-phase induction motor 1700 of the modified example 16 shown in FIG. The rotor large slot 740h in which is formed is long in the radial direction.

  A single-phase induction motor 1800 of Modification 17 includes a stator 12 and a rotor 1811. The stator 12 is the same as that of the single-phase induction motor 100 (FIG. 1). The rotor 1811 includes a rotor core 1811a and a double squirrel-cage conductor.

  The rotor core 1811a has a small rotor slot 740a-0 (a slot in which an aluminum bar is formed) and a large rotor slot 740h (copper bar) provided along the outer peripheral edge of the rotor core 1811a on the radially outer peripheral side. Are inserted).

  The rotor large slot 740h (the slot into which the copper bar is inserted) has a larger area than the rotor small slot 740a-0 (the slot in which the aluminum bar is formed). The large rotor slot 740h is longer in the radial direction than the small rotor slot 740a-0.

  As shown in FIG. 82 (a), the rotor large slot 740h includes an outer layer slot 740h-1 provided along the outer peripheral edge of the rotor core 1811a and an inner layer slot provided on the inner peripheral side of the outer layer slot 740h-1. 740h-2 and a connection slot 740h-3 that connects the outer layer slot 740h-1 and the inner layer slot 740h-2.

  As shown in FIGS. 79 and 80, an aluminum bar 730h containing a copper bar is formed in the rotor large slot 740h. That is, the outer layer aluminum bar 730h-1 is formed in the outer layer slot 740h-1, and the copper bar 730j-1 is inserted and the inner layer aluminum bar 730h-2 is formed in the inner layer slot 740h-2. Aluminum is also cast into the connection slot 740h-3 to form a connection aluminum bar 730h-3.

  Further, as shown in FIG. 82 (b), the rotor small slot 740a-0 includes an outer layer slot 740a-1 provided along the outer peripheral edge of the rotor core 1711a and an inner peripheral side of the outer layer slot 740a-1. The inner layer slot 740a-2 is provided, and the outer layer slot 740a-1 is connected to the inner layer slot 740a-2.

  Only aluminum is cast into the rotor small slot 740a-0. The outer layer aluminum bar 730a-1 is formed in the outer layer slot 740a-1, and the inner layer aluminum bar 730a-2 is formed in the inner layer slot 740a-2. Aluminum is also cast into the connection slot 740a-3 to form a connection aluminum bar 730a-3 (see FIG. 75).

  In the example of FIG. 78 (FIG. 81), the number of rotor slots is 26 small rotor slots 740a-0 (slots where aluminum bars are formed) and large rotor slots 740h (slots where copper bars are inserted). ) Is 4, and 30 in total. After all, the single-phase induction motor 1800 of FIG. 78 is a combination in which the stator core 12a has 24 slots and the rotor core 1811a has 30 total slots.

  Aluminum bars 730a (26 pieces) and copper bars-containing aluminum bars 730h (four pieces) form a double squirrel-cage secondary conductor together with end rings 32 (see FIG. 9) provided on both end surfaces of the rotor 1811 in the stacking direction. To do.

  78 and 79, the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotation direction of the rotor 1811 , The central part of the four rotor large slots 740h arranged in succession is arranged at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux (angle α). = 45 degrees).

  As described above, the single-phase induction motor 1800 having the double-cage rotor 1811 has a high slip frequency (difference between the frequency of the rotating magnetic field and the rotation speed of the rotor 1811) at the time of startup. The leakage flux of the inner layer aluminum bar (for example, inner layer aluminum bar 730a-2) is larger than the leakage flux of the outer layer aluminum bar (for example, outer layer aluminum bar 730a-1). At start-up with a high slip frequency, the current distribution is determined by the reactance, and the secondary current flows mainly to the outer aluminum bar (for example, outer aluminum bar 730a-1). Therefore, when the secondary resistance is increased, the starting torque is increased and the starting characteristics are improved.

  During normal operation, since the slip frequency is low, the secondary current flows through the entire aluminum bar, so that the aluminum cross-sectional area increases and the secondary resistance decreases. Therefore, the secondary copper loss is reduced, and thus the efficiency can be improved.

  In addition, as shown in FIGS. 78 and 79, the single-phase induction motor 1800 of Modification 17 is generated by the main winding 20b with the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a facing downward. When the direction of the main winding magnetic flux is rightward and the rotation direction of the rotor 1811 is clockwise, the central part of the four rotor large slots 740h that are continuously arranged is set to the direction of the auxiliary winding magnetic flux. 9 are arranged side by side at a position delayed by 45 degrees (angle α = 45 degrees), so that the starting torque characteristic shown in FIG. 9 is provided and the starting torque characteristic is further improved.

  Next, a single-phase induction motor 1900 according to Modification 18 will be described with reference to FIGS. 83 to 85.

  83 to 85 are diagrams showing the first embodiment. FIG. 83 is a cross-sectional view of a single-phase induction motor 1900 according to a modification 18. FIG. 84 is a cross-sectional view of a rotor 1911. FIG. 85 is a rotor core 1911a. FIG.

  The single-phase induction motor 1900 of Modification 18 shown in FIGS. 83 to 85 differs from the single-phase induction motor 1700 shown in FIG. 72 in the shape of the rotor 1911 (see FIG. 84).

  The rotor 1911 has an angle α = 45 degrees (the direction of the auxiliary winding magnetic flux generated by the auxiliary winding 20a is directed downward, the direction of the main winding magnetic flux generated by the main winding 20b is directed rightward, and the rotor 1911 rotates. When the direction is clockwise, the central part of the four rotor large slots 40f arranged in succession is arranged at a position delayed by 45 degrees with respect to the direction of the auxiliary winding magnetic flux). Four large rotor slots 740f arranged side by side (rotor slots into which the copper bars 730g-1 are inserted) are also arranged side by side at positions shifted by 180 degrees. That is, a total of 30 large rotor slots 740f (rotor slots into which copper bars 730g-1 are inserted) and a total of 22 small rotor slots 740a-0 in which aluminum bars 730a are formed. Rotor slots.

  The starting torque characteristic of the single-phase induction motor 1900 of Modification 18 is substantially the same as the starting torque characteristic shown in FIG.

  In FIG. 19, as in FIG. 9 described above, changing the angle α changes the starting torque characteristic, and the starting torque (starting torque ratio) becomes maximum at a position where α is about 45 degrees and about 225 degrees. Yes. Compared to the characteristic diagram of FIG. 9, it can be seen that the starting torque characteristic is even greater.

  In the present embodiment, the rotor large slot 740f (rotor slot into which the copper bar 730g-1 is inserted) is also arranged at a position shifted by 180 degrees so that the angle α is approximately 45 degrees. In addition, it is possible to obtain a highly reliable single-phase induction motor 1900 that has good starting torque characteristics and can be started even when the voltage of the AC power supply is low.

  Next, a single phase induction motor 2000 of Modification 19 will be described with reference to FIGS. 86 to 88.

  86 to 88 are diagrams showing the first embodiment. FIG. 86 is a transverse sectional view of a single-phase induction motor 2000 according to the modification 19. FIG. 87 is a transverse sectional view of the rotor 2011. FIG. 88 is a rotor core 2011a. FIG.

  Also in the single-phase induction motor 1900 of the modification 18, the large rotor slot may have a shape that is longer not only in the circumferential direction but also in the radial direction than the small rotor slot 740a-0.

  86 and 87, a rotor small slot 740a-0 provided along the outer peripheral edge of the rotor core 2011a on the radially outer peripheral side of the rotor core 2011a (FIG. 88), and a radial direction Has a rotor slot consisting of a long rotor large slot 740h.

  In the example of FIGS. 86 to 88, the number of rotor slots is 22 for the small rotor slots 740a-0 and 8 for the large rotor slots 740h, which is 30 in total.

  Even with the configuration as shown in FIG. 86, characteristics substantially equivalent to the starting torque characteristics shown in FIG. 23 can be obtained.

  Next, a single-phase induction motor 2100 according to Modification 20 will be described with reference to FIGS.

  FIGS. 89 to 91 are diagrams showing the first embodiment, FIG. 89 is a transverse sectional view of the single-phase induction motor 2100 of the modification 20, FIG. 90 is an enlarged view of the S portion of FIG. 89, and FIG. FIG.

  The single-phase induction motor 2100 of Modification 20 shown in FIG. 89 is different from the single-phase induction motor 1700 shown in FIG. It is provided at a position shifted downward (eccentricity). The shape of the rotor 1711 is the same as that shown in FIG. 89. From the rotor large slot 740f (the rotor slot into which the copper bar 730g-1 is inserted) and the rotor small slot 740a-0 (the aluminum bar 730a is formed). As shown in FIG. 72, the angle α is 45 degrees.

  89, when the rotor 1711 rotates clockwise, when the eccentric position of the rotor 1711 is set to β with respect to the downward auxiliary winding magnetic flux in the figure, the single-phase induction motor 2100 shown in FIG. β = 45 degrees.

  Since the rotor 1711 is arranged at an eccentric position with respect to the stator 12, the gap dimension between the stator 12 and the rotor 1711 is not constant, and as shown in FIGS. 90 and 91, the gap 60a The radial dimension is different between the S portion in FIG. 89 and the enlarged view in FIG. 90 and the gap 60b (T portion in FIG. 89 and the enlarged view in FIG. 91). For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. However, this dimension is an example and is not limited thereto.

  The starting torque characteristic of the single-phase induction motor 2100 of the modification 14 is substantially the same as the starting torque characteristic shown in FIG.

  In FIG. 23, the starting torque is changed by changing the eccentric position β, and the position of the eccentric position β = 45 degrees, that is, the rotor slot 40c (the rotor slot into which the copper bar 30c is inserted) is arranged. The starting torque can be further increased by decentering the rotor 1711 at the predetermined position.

  In the example of FIG. 89, the case where the eccentric position β = 45 degrees has been described. However, if β is in the range of about 0 to 60 degrees, a single-phase induction motor 2100 with good starting characteristics can be obtained.

  The improvement of the starting torque means that a reliable single-phase induction motor 2100 that can be started even when the voltage of the AC power supply applied to the single-phase induction motor 2100 is low can be obtained.

  Next, a single-phase induction motor 2200 of Modification 21 will be described with reference to FIGS. 92 to 94.

  92 to 94 are diagrams showing the first embodiment. FIG. 92 is a cross-sectional view of the single-phase induction motor 2200 according to the modified example 21, FIG. 93 is an enlarged view of a U portion in FIG. 92, and FIG. FIG.

  The single-phase induction motor 2200 of Modification 21 provided with a large rotor large slot 40h in the radial direction shown in FIG. 92 differs from the single-phase induction motor 2100 shown in FIG. 89 in the shape of the large rotor slot. In the single-phase induction motor 2100 shown in FIG. 89, the rotor large slot 740f has a larger width in the circumferential direction than the rotor small slot 740a-0, but the single-phase induction motor 2200 of Modification 21 shown in FIG. Then, the rotor large slot 740h is configured to be longer in the radial direction than the rotor small slot 740a-0.

  Thus, using the rotor large slot 740h having a longer radial length than the rotor small slot 740a-0, the rotor 1811 is arranged eccentrically with respect to the stator 12, The gap dimension between the rotors 1811 is not constant. As shown in FIGS. 93 and 94, the gap 60a (the U part in FIG. 92, an enlarged view is shown in FIG. 93) and the gap 60b (the V part in FIG. 92). The radial dimension of FIG. 94 is an enlarged view). For example, the radial dimension Ga of the gap 60a is set to 0.7 mm, and the radial dimension Gb of the gap 60b is set to 0.3 mm. Even in such a configuration, a starting torque characteristic substantially equivalent to the starting torque characteristic shown in FIG. 29 can be obtained.

  As an application example of the present invention, there is a single-phase induction motor used in a hermetic compressor.

  1 cylinder, 1a vane groove, 1b cylinder chamber, 1c back pressure chamber, 1d notch, 2 rolling piston, 2a outer periphery, 2b inner periphery, 3 vane, 3a tip, 3b side surface portion, 4 main bearing, 5 sub bearing, 7 discharge Muffler, 8 vane spring, 11 rotor, 11a rotor core, 11b air hole part, 11b-1 air hole part, 11b-2 air hole part, 11b-3 air hole part, 11b-4 air hole part, 11c shaft hole, 12 stator , 12a Stator core, 12b Stator slot, 12c Stator notch, 12d Core back, 12e Teeth, 12f Notch, 20 windings, 20a Auxiliary winding, 20b Main winding, 21 Suction muffler, 22 Suction pipe, 23 Lead Wire, 24 terminals, 25 discharge pipe, 30a aluminum bar, 30c copper bar, 30d copper bar, 30e aluminum bar, 3 f Aluminum bar, 30 g Copper bar, 32 end ring, 40a Rotor slot, 40c Rotor slot, 40d Rotor slot, 40e Rotor small slot, 40f Rotor large slot, 40h Rotor large slot, 50 Rotating shaft, 50a Eccentric shaft part, 50b Main shaft part, 50c Secondary shaft part, 60 gap, 60a gap, 60b gap, 70 airtight container, 90 refrigerator oil, 100 single phase induction motor, 200 single phase induction motor, 211 rotor, 211a rotor core 300 single phase induction motor, 400 single phase induction motor, 411 rotor, 411a rotor core, 500 single phase induction motor, 501 compression element, 510 rotary compressor, 511 rotor, 511a rotor core, 600 single phase induction Electric motor, 700 single-phase induction motor, 711 rotor, 711a Trochanter core, 730a aluminum bar, 730a-1 outer layer aluminum bar, 730a-2 inner layer aluminum bar, 730a-3 connecting aluminum bar, 730c aluminum bar with copper bar, 730c-1 copper bar, 730d copper bar, 730f with copper bar Aluminum bar, 730f-1 outer layer aluminum bar, 730f-2 inner layer aluminum bar, 730f-3 connecting aluminum bar, 730g-1 copper bar, 730h Copper bar containing aluminum bar, 730h-1 outer layer aluminum bar, 730h-2 inner layer aluminum bar , 730h-3 Connecting aluminum bar, 730j-1 Copper bar, 740a Rotor slot, 740a-0 Rotor small slot, 740c Rotor slot, 740d Rotor slot, 740f Rotor large slot, 740f-1 Outer layer slot, 740f -2 inner layer slot, 74 f-3 connecting slot, 740h rotor large slot, 740h-1 outer layer slot, 740h-2 inner layer slot, 740h-3 connecting slot, 800 single phase induction motor, 811 rotor, 811a rotor core, 900 single phase induction motor , 1000 Single-phase induction motor, 1011 rotor, 1011a rotor core, 1100 single-phase induction motor, 1111 rotor, 1111a rotor core, 1200 single-phase induction motor, 1300 single-phase induction motor, 1311 rotor, 1311a rotor Iron core, 1400 single-phase induction motor, 1411 rotor, 1411a rotor iron core, 1500 single-phase induction motor, 1600 single-phase induction motor, 1700 single-phase induction motor, 1711 rotor, 1711a rotor core, 1800 single-phase induction motor, 1811 rotor, 1 11a rotor core 1900 single-phase induction motor, 1911 rotor, 1911a rotor core, 2000 single-phase induction motor, 2011 rotor, 2011a rotor core, 2100 single-phase induction motor, 2200 single-phase induction motor.

Claims (6)

A main winding in a plurality of stator slots formed along an inner periphery of the stator core magnetic steel sheets are manufactured by a predetermined number of stacked punched into a predetermined shape, a stator and an auxiliary winding has been inserted And a single-phase induction motor comprising a rotor disposed on the inner peripheral side of the stator via a gap,
The rotor is
A rotor core manufactured by laminating a predetermined number of electromagnetic steel sheets punched into a predetermined shape;
A rotor slot formed along an outer peripheral edge of the rotor core and filled with a conductive material;
Comprising
Of the rotor slots, a predetermined number of rotor slots filled with a conductive material having a low electrical resistivity are continuously arranged at predetermined positions , and the auxiliary winding is turned on when the single-phase induction motor is started. From the direction of the auxiliary winding magnetic flux generated by the current flowing through the rotor, the central portion of the plurality of rotor slots having low electrical resistivity is 20 to 70 degrees in electrical angle with respect to the rotation direction of the rotor. A single-phase induction motor characterized in that it is set at a position delayed within the range . The axis of rotation of said rotor with respect to the center axis of the stator, single-phase induction motor according to claim 1, characterized in that disposed eccentrically. The rotation axis of the rotor is delayed from 0 degree to 60 degrees in electrical angle with respect to the rotation direction of the rotor from the direction of the auxiliary winding magnetic flux generated by the current flowing through the auxiliary winding. single-phase induction motor according to claim 2, characterized in that it is eccentric to the position. The single-phase induction motor according to any one of claims 1 to 3 , wherein the cage secondary conductor is formed by performing aluminum die casting after the copper bar is filled. A hermetic compressor comprising the single-phase induction motor according to any one of claims 1 to 4 . A hermetic compressor with a rotary compression element,
The eccentric direction of the eccentric shaft portion of the rotating shaft, together with the low conductivity material electrical resistivity and position of the rotor slot is filled substantially identical, the main winding and the eccentric direction of the eccentric shaft portion 6. The hermetic compressor according to claim 5, wherein the auxiliary winding is set in a predetermined positional relationship.

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