WO2012053064A1 - 誘導電動機の回転子及び誘導電動機及び圧縮機及び送風機及び空気調和機 - Google Patents
誘導電動機の回転子及び誘導電動機及び圧縮機及び送風機及び空気調和機 Download PDFInfo
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- WO2012053064A1 WO2012053064A1 PCT/JP2010/068407 JP2010068407W WO2012053064A1 WO 2012053064 A1 WO2012053064 A1 WO 2012053064A1 JP 2010068407 W JP2010068407 W JP 2010068407W WO 2012053064 A1 WO2012053064 A1 WO 2012053064A1
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- rotor
- slot
- induction motor
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- circumferential
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/165—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors characterised by the squirrel-cage or other short-circuited windings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/0085—Prime movers
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/18—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having double-cage or multiple-cage rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/356—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member
- F04C18/3562—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation
- F04C18/3564—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the outer member the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention relates to an induction motor rotor, and more particularly to a slot shape of an induction motor rotor.
- the present invention also relates to an induction motor using a rotor of the induction motor, a compressor and a blower equipped with the induction motor, and an air conditioner equipped with the compressor and the blower.
- an induction motor that includes a rotor core having a plurality of slots and a secondary conductor housed in the slot of the rotor core, and the secondary conductor is formed of aluminum die casting
- the entire rotor core A slit that is not connected to the slot is provided on the rotor surface side of the closed slot, and the circumferential dimension of the slit is in the range of 1.0 mm to 3.5 mm, and the radial dimension is in the range of 1.0 mm to 2.5 mm.
- Patent Document 1 A high-performance induction motor that can always reduce power factor, stray load loss, noise, etc. has been proposed (see, for example, Patent Document 1).
- the air gap refers to a gap (usually several hundred ⁇ m) between the stator and the rotor.
- the present invention has been made to solve the above problems, and there are an outer peripheral slot near the rotor outer peripheral portion, an inner peripheral slot communicating with the outer peripheral slot and existing inside the outer peripheral slot,
- the circumferential width TC of the innermost circumference of the outer peripheral slot is smaller than the circumferential width TD of the outermost circumference of the inner circumferential slot, and the circumferential width of the outer circumferential slot becomes smaller toward the outer circumference of the rotor.
- an induction motor rotor an induction motor, a compressor, a blower, and an air conditioner that can improve the characteristics of the motor with a smooth flow.
- the rotor of the induction motor according to the present invention is a rotor of an induction motor having a squirrel-cage secondary conductor formed by filling a rotor slot of a rotor core with a nonmagnetic and conductive material.
- the rotor slot An outer peripheral slot formed in the vicinity of the outer periphery of the rotor; It is composed of an inner circumferential slot that communicates with the outer circumferential slot and is formed inside the outer circumferential slot,
- the circumferential width TC of the innermost circumference of the outer peripheral slot is smaller than the circumferential width TD of the outermost circumference of the inner circumferential slot,
- the circumferential width of the outer peripheral slot is characterized by decreasing toward the outer peripheral portion of the rotor.
- the rotor slot includes an outer peripheral slot close to the outer peripheral portion of the rotor, and an inner peripheral slot that communicates with the outer peripheral slot and is formed inside the outer peripheral slot.
- the circumferential width TC of the innermost circumference of the inner circumferential slot is smaller than the circumferential width TD of the outermost circumference of the inner circumferential slot, and the circumferential width of the outer circumferential slot becomes smaller toward the rotor outer circumferential portion.
- the concentration of the secondary current can be relaxed and the characteristics of the induction motor can be improved.
- FIG. 2 It is a figure shown for a comparison and is a cross-sectional view of a general induction motor 200. It is a figure shown for a comparison and is a cross-sectional view of the stator 220 of a general induction motor 200. It is a figure shown for a comparison and is a cross-sectional view of a stator core 221 of a general induction motor 200. It is a figure shown for a comparison and is a perspective view of the rotor 210 of the general induction motor 200. FIG. It is a figure shown for a comparison and is a cross-sectional view of the rotor 210 of the general induction motor 200.
- FIG. 3 shows the first embodiment and is a cross-sectional view of the induction motor 100.
- FIG. 3 shows the first embodiment and is a perspective view of the rotor 10 of the induction motor 100.
- FIG. 3 shows the first embodiment and is a cross-sectional view of the rotor 10 of the induction motor 100.
- FIG. 3 shows the first embodiment, and is a cross-sectional view of the rotor core 11 of the induction motor 100.
- FIG. FIG. 4 shows the first embodiment, and is an enlarged view of a rotor slot 13.
- FIG. 5 shows the first embodiment, and is an enlarged view of a rotor slot 13 of the example. The elements on larger scale of FIG. FIG.
- FIG. 3 shows the first embodiment and is a longitudinal sectional view of a two-cylinder rotary compressor 400.
- FIG. 3 shows the first embodiment, and is a refrigerant circuit diagram of the air conditioner.
- FIG. 3 is a diagram showing the first embodiment, and is an exploded perspective view of the outdoor unit 600 of the air conditioner.
- FIG. 1 to 3 are diagrams for comparison, FIG. 1 is a cross-sectional view of a general induction motor 200, FIG. 2 is a cross-sectional view of a stator 220 of the general induction motor 200, and FIG. 2 is a cross-sectional view of a stator core 221 of a typical induction motor 200.
- FIG. 1 is a cross-sectional view of a general induction motor 200
- FIG. 2 is a cross-sectional view of a stator 220 of the general induction motor 200
- FIG. 2 is a cross-sectional view of a stator core 221 of a typical induction motor 200.
- a general induction motor 200 (hereinafter sometimes simply referred to as a motor) includes a stator 220 and a rotation disposed inside the stator 220 via a gap 230 (air gap). A child 210.
- the stator 220 includes a substantially ring-shaped stator core 221 and a winding 222 inserted into a slot 225 formed in the stator core 221.
- the winding 222 is concentrated winding or distributed winding wound around each tooth 224. Further, the winding 222 is single-phase or three-phase.
- the stator core 221 is manufactured by punching out a magnetic steel sheet having a thickness of 0.1 to 1.5 mm into a predetermined shape, stacking a predetermined number of sheets in the axial direction, and fixing by punching or welding.
- the stator core 221 has a ring-shaped core back 223 formed on the outer peripheral side, and a plurality (24 in this case) of teeth 224 are radially formed from the inner peripheral side of the core back 223. It extends in the 210 direction.
- the circumferential width of each tooth 224 is substantially constant in the radial direction.
- a slot 225 (space) is formed between two adjacent teeth 224.
- the number of slots 225 is 24, which is the same as the number of teeth 224. Since the circumferential width of each tooth 224 is substantially constant in the radial direction, the circumferential width of the slot 225 gradually increases from the inner side (rotor 210 side) toward the outer side (core back 223 side). .
- the slot 225 opens into the gap 230 (see FIG. 1), which is referred to as a slot opening 225a (slot opening). Winding 222 is inserted from slot opening 225a.
- FIG. 4 is a perspective view of a rotor 210 of a general induction motor 200
- FIG. 5 is a cross-sectional view of the rotor 210 of the general induction motor 200
- 6 is a cross-sectional view of a rotor core 211 of a general induction motor 200.
- the rotor 210 includes two cage-shaped iron cores 211, an aluminum bar 212 (see FIG. 5), and a pair of end rings 217 formed at both ends in the stacking direction.
- the aluminum bar 212 and the end ring 217 are manufactured by casting aluminum simultaneously by die casting.
- the cage secondary conductor may be formed of copper other than aluminum.
- the aluminum bar 212 forms a squirrel-cage secondary conductor with the pair of end rings 217 formed at both ends in the stacking direction.
- the rotor core 211 is formed by punching out a magnetic steel sheet having a thickness of 0.1 to 1.5 mm into a predetermined shape, and then stacking a predetermined number of sheets in the axial direction and fixing by punching or welding. Produced.
- the rotor core 211 has a substantially circular cross section, and a plurality (30) of rotor slots 213 are formed at substantially equal intervals in the circumferential direction along the outer peripheral edge.
- a rotor tooth 214 is formed between two adjacent rotor slots 213.
- the number of rotor teeth 214 is 30 which is the same as the number of rotor slots 213.
- the circumferential width of the rotor teeth 214 is substantially constant in the radial direction. Therefore, the circumferential width of the rotor slot 213 gradually increases from the inner side toward the outer periphery.
- a shaft hole 216 into which a drive shaft (not shown) is fitted is formed at the center of the rotor core 211.
- the core portion between the rotor slot 213 and the shaft hole 216 is called a core back 215.
- the rotor slot 213 is filled with a non-magnetic and conductive material (for example, aluminum), if the magnetic flux of the stator 220 is linked to the rotor slot 213 and there is a change in the magnetic flux, the aluminum is changed. A secondary current is generated in the bar 212, and torque is generated by the secondary current and the magnetic flux from the stator 220.
- a non-magnetic and conductive material for example, aluminum
- the secondary current generated in the rotor slot 213 is constant because the magnetic flux from the stator 220 does not cross over a part of the rotor slot 213 of the rotor 210 and the magnetic flux changes at a stroke.
- FIG. 7 and 8 are diagrams for comparison, and FIG. 7 is a diagram illustrating a state in which secondary currents generated by linkage of magnetic flux from the stator 220 in the rotor 210 of the general induction motor 200 are concentrated.
- FIG. 8 is a diagram illustrating a state where secondary currents generated by linkage of magnetic flux from the stator in another general rotor 310 are concentrated.
- the rotor 210 of the general induction motor 200 has a narrow radial width D1 between the rotor slot 213 and the outer periphery of the rotor 210, so that the magnetic flux from the stator 220 is generated from the rotor slot.
- a part of 213 (from the vicinity of the apex on the outer peripheral side of the rotor slot 213 to the upper right corner (in FIG. 7)) is linked.
- the arrows in FIG. 7 indicate the flow of magnetic flux from the stator 220.
- the secondary current flows concentrated on the part where the magnetic flux from the stator 220 of the rotor slot 213 is linked.
- the secondary resistance is larger than that in the case where the secondary current flows through the entire rotor slot 213, the secondary copper loss increases, and the efficiency deteriorates.
- This secondary copper loss may be called stray load loss or harmonic secondary copper loss.
- FIG. 8 is different in general shape from the rotor 210 and the rotor slot 313.
- the shape on the outer peripheral side of the rotor slot 213 is an arc, whereas the outer peripheral side of the rotor slot 313 is flat.
- the magnetic flux from the stator causes a part of the rotor slot 313 (rotor The upper right corner (in FIG. 8) is linked from near the center on the outer peripheral side of the slot 313.
- the arrows in FIG. 8 indicate the flow of magnetic flux from the stator.
- An aluminum bar 312 is cast into the rotor slot 313.
- FIG. 9 to 12 show the first embodiment.
- FIG. 9 is a cross-sectional view of the induction motor 100.
- FIG. 10 is a perspective view of the rotor 210 of the induction motor 100.
- FIG. 11 is the rotor 10 of the induction motor 100.
- FIG. 12 is a cross-sectional view of the rotor core 11 of the induction motor 100.
- the induction motor 100 of the present embodiment includes a stator 20 and a rotor 10 disposed inside the stator 20 via a gap 30 (air gap).
- stator 20 of the induction motor 100 of the present embodiment has the same configuration as the stator 220 (see FIG. 2) of the general induction motor 200, description thereof is omitted.
- the induction motor 100 (hereinafter sometimes simply referred to as a motor) is characterized by the rotor 10. More specifically, the shape of the rotor slot 13 is characteristic.
- the rotor 10 includes a rotor core 11, an aluminum bar 12 (see FIG. 11, a nonmagnetic and conductive material), and a pair of end rings 17 formed at both ends in the stacking direction.
- a squirrel-cage secondary conductor The aluminum bar 12 and the end ring 17 are manufactured by casting aluminum simultaneously by die casting.
- the cage secondary conductor may be formed of copper other than aluminum.
- the aluminum bar 12 forms a cage secondary conductor with the pair of end rings 17 formed at both ends in the stacking direction.
- the rotor core 11 is manufactured by punching a magnetic steel sheet having a thickness of 0.1 to 1.5 mm into a predetermined shape, stacking it in a predetermined number of axes, and fixing by punching or welding.
- the rotor core 11 has a substantially circular cross section, and a plurality (30) of rotor slots 13 are formed at substantially equal intervals in the circumferential direction along the outer peripheral edge.
- a rotor tooth 14 is formed between two adjacent rotor slots 13.
- the number of rotor teeth 14 is 30 which is the same as the number of rotor slots 13.
- the circumferential width of the rotor teeth 14 is substantially constant in the radial direction. Therefore, the circumferential width of the rotor slot 13 gradually increases from the inner side toward the outer periphery.
- a shaft hole 16 into which a drive shaft (not shown) is fitted is formed at the center of the rotor core 11.
- the core portion between the rotor slot 13 and the shaft hole 16 is called a core back 15.
- FIG. 13 shows the first embodiment and is an enlarged view of the rotor slot 13.
- the rotor slot 13 includes an outer peripheral slot 13a close to the outer peripheral portion of the rotor and an inner peripheral slot 13b that communicates with the outer peripheral slot 13a and is formed inside the outer peripheral slot 13a.
- the shape of the outer peripheral slot 13a is substantially triangular, and the shape of the inner peripheral slot 13b is similar to the rotor slot 313 of the general rotor 310 (see FIG. 8).
- each part of the rotor slot 13 is defined.
- TA the shortest distance between the outer peripheral slot 13a and the outer periphery of the rotor
- TB the shortest distance between the center side of the inner peripheral slot 13b and the outer periphery of the rotor
- TC width in the circumferential direction of the innermost circumference of the outer circumferential slot 13a
- TD the circumferential width of the outermost periphery of the inner peripheral slot 13b
- TE The shortest distance between the end portion side of the inner peripheral slot 13b and the outer peripheral portion of the rotor.
- the circumferential width TC of the innermost periphery of the outer peripheral slot 13a is smaller than the circumferential width TD of the outermost periphery of the inner peripheral slot 13b.
- the circumferential width of the outer circumferential slot 13a is set to be smaller toward the outer circumferential portion of the rotor, the concentration of the secondary current is relaxed, and the characteristics of the induction motor 100 are improved. This principle will be described below.
- the radial width between the rotor slot and the outer periphery of the rotor may be increased. However, if the radial width between the rotor slot and the outer periphery of the rotor is increased, the leakage magnetic flux passing between the rotor slot and the outer periphery of the rotor increases, and the motor characteristics deteriorate.
- the rotor slot 13 of the present embodiment includes an outer peripheral slot 13a near the outer periphery of the rotor, an inner peripheral slot 13b that communicates with the outer peripheral slot 13a and is formed inside the outer peripheral slot 13a. Consists of. Furthermore, the circumferential width TC of the innermost circumference of the outer circumferential slot 13a is smaller than the circumferential width TD of the outermost circumference of the inner circumferential slot 13b, and the circumferential width of the outer circumferential slot 13a is at the outer circumference of the rotor. By decreasing in size, there are no slots in the vicinity of the outer periphery of the rotor, and magnetic flux from the stator 20 is prevented from passing through the rotor slot 13.
- the circumferential width of the outer peripheral slot 13a becomes smaller toward the rotor outer peripheral portion, the slots existing in the vicinity of the rotor outer peripheral portion can be reduced. Furthermore, by reducing the shortest distance TA between the outer peripheral slot 13a and the rotor outer peripheral portion (in one example, 0.3 mm), it is possible to prevent leakage magnetic flux passing between the outer peripheral slot 13a and the rotor outer peripheral portion. It is.
- the circumferential width TC of the innermost periphery of the outer peripheral slot 13a is 1.5 times or more the thickness T (0.1 to 1.5 mm) of the electromagnetic steel sheet. Have a width of.
- the circumferential width of the outer circumferential slot 13a is gradually reduced toward the outer circumferential portion of the rotor.
- the outer peripheral slot 13a can prevent the magnetic flux of the stator 20 from flowing so as to graze the rotor slot 13
- the circumferential width TD of the outermost periphery of the inner peripheral slot 13b is set to the innermost periphery of the outer peripheral slot 13a.
- the area of the inner circumferential slot 13b is increased by making it larger than the circumferential width TC. When the area of the inner peripheral slot 13b is increased, the secondary resistance is reduced and the motor efficiency is improved.
- the rotor slot 13 of the present embodiment has a smaller outer peripheral slot 13a than a normal rotor slot, the thin portion between the rotor slot 13 and the outer peripheral part of the rotor is reduced. The punching performance by the is improved, and there is an effect that the maintenance and life of the mold are improved.
- the shortest distance TB between the center side of the inner peripheral slot 13b and the outer peripheral portion of the rotor, and the shortest distance TE between the end portion side of the inner peripheral slot 13b and the outer peripheral portion of the rotor are a certain distance rotor outer peripheral portion.
- the specific dimensions are unclear, and if it is too close to the outer periphery of the rotor, the magnetic flux from the stator grabs the rotor slot like the normal rotor slot, and the secondary current Will concentrate and flow efficiency will deteriorate.
- FIGS. 14 and 15 are diagrams showing the first embodiment
- FIG. 14 confirms that the secondary copper loss / output [%] rapidly decreases as TB is increased from 0.5 mm. This indicates that by increasing TB, the magnetic flux from the stator 20 reduces the concentration of the secondary current by grazing the rotor slot 13. Also, the TB gradually decreases from around 1.0 mm, reaches the bottom at 1.5 to 2.0 mm, and then gradually increases. Furthermore, it can be confirmed from FIG. 14 that this effect does not change greatly even if the air gap is changed.
- TB is larger from 1.0 mm from the viewpoint of loss, and is preferably smaller from the viewpoint of torque. Therefore, from the two characteristics, 1.0 mm ⁇ TB ⁇ It is desirable to use at 2.5 mm (1.0 mm ⁇ TE ⁇ 2.5 mm).
- the shortest distance TB between the center side of the inner peripheral slot 13b and the outer peripheral portion of the rotor is preferably TB ⁇ TE.
- the shortest distance TA between the outer peripheral slot 13a and the rotor outer peripheral portion is made smaller than the plate thickness T of the electromagnetic steel sheet constituting the rotor core 11, so that the rotor slot 13 and the rotor outer peripheral portion are separated. It is possible to reduce the magnetic flux leaking from the gap, and the magnetic flux can be used effectively, which is effective for high output and high efficiency. This will be described below.
- the shortest distance TA between the outer peripheral slot 13a and the outer peripheral portion of the rotor is generally made as small as possible. This is because the magnetic flux that passes between the rotor slot 13 and the outer periphery of the rotor and does not interlink with the rotor slot 13 is reduced as much as possible, and the magnetic flux from the stator 20 is used effectively.
- the rotor slot 13 of the present embodiment (the shape shown in FIG. 13) even if the shortest distance TA between the outer peripheral slot 13a and the outer peripheral portion of the rotor is reduced, the magnetic flux from the stator 20 is reduced.
- the rotor slot 13 is not glazed, and the magnetic flux from the stator 20 can be used effectively.
- the shortest distance TA between the outer peripheral slot 13a and the rotor outer peripheral portion smaller than the plate thickness T of the electromagnetic steel plate constituting the rotor core 11, the radial direction between the outer peripheral slot 13a and the outer peripheral portion of the rotor. Magnetic properties of the thin-walled portion deteriorate due to punching distortion.
- the saturation magnetic flux density is reduced due to the deterioration of the magnetic characteristics of the radially thin portion of the outer peripheral slot 13a and the outer peripheral portion of the rotor, and therefore, the chain passes to the rotor slot 113 between the outer peripheral slot 13a and the outer peripheral portion of the rotor. Magnetic flux that does not intersect can be reduced.
- FIG. 16 is a diagram showing the first embodiment, and is an enlarged view of the rotor slot 13 of the example, and FIG. 17 is a partially enlarged view of FIG.
- rounding of the rotor slot 13 is omitted in order to clarify the definition of the dimensions of each part. However, each corner of the rotor slot 13 is actually rounded.
- An example of an embodiment of the rotor slot 13 will be described with reference to FIGS.
- each corner of the rotor slot 13 is rounded. This is because the mold for punching the rotor core 11 is usually chamfered at each corner.
- FIG. 18 shows the first embodiment, and is a longitudinal sectional view of the two-cylinder rotary compressor 400.
- FIG. The configuration of a two-cylinder rotary compressor 400 (an example of a hermetic compressor) will be described with reference to FIG.
- the two-cylinder rotary compressor 400 includes an induction motor 100 including the stator 20 and the rotor 10 according to the present embodiment, and a compression mechanism unit 500 driven by the induction motor 100 in the sealed container 2 in a high-pressure atmosphere. Is housed.
- Induction motor 100 is a single-phase induction motor.
- a two-cylinder rotary compressor 400 will be described as an example of a hermetic compressor, but other scroll compressors, one-cylinder rotary compressors, multiple-stage rotary compressors, and swing rotary compressors.
- a vane compressor, a reciprocating compressor, or the like may be used.
- the rotational force of the induction motor 100 is transmitted to the compression mechanism 500 through the main shaft 8a of the rotating shaft 8.
- the rotating shaft 8 includes a main shaft 8a fixed to the rotor 10 of the induction motor 100, a sub shaft 8b provided on the opposite side of the main shaft 8a, and a predetermined phase difference (for example, between the main shaft 8a and the sub shaft 8b). 180 °), the main shaft side eccentric portion 8c and the sub shaft side eccentric portion 8d, and the intermediate shaft 8e provided between the main shaft side eccentric portion 8c and the sub shaft side eccentric portion 8d. And have.
- the main bearing 6 is fitted to the main shaft 8a of the rotary shaft 8 with a clearance for sliding, and rotatably supports the main shaft 8a.
- auxiliary bearing 7 is fitted to the auxiliary shaft 8b of the rotary shaft 8 with a clearance for sliding, and rotatably supports the auxiliary shaft 8b.
- the compression mechanism unit 500 includes a first cylinder 5a on the main shaft 8a side and a second cylinder 5b on the sub shaft 8b side.
- the first cylinder 5a has a cylindrical inner space, and a first piston 9a (rolling piston) that is rotatably fitted to the main shaft side eccentric portion 8c of the rotating shaft 8 is provided in the inner space. . Furthermore, a first vane (not shown) that reciprocates according to the rotation of the main shaft side eccentric portion 8c is provided.
- the first vane is housed in the vane groove of the first cylinder 5a, and the vane is always pressed against the first piston 9a by a vane spring (not shown) provided in the back pressure chamber.
- a vane spring (not shown) provided in the back pressure chamber.
- the vane spring mainly presses the first vane against the first piston 9a when the two-cylinder rotary compressor 400 is started (when there is no difference in pressure between the sealed container 2 and the cylinder chamber).
- the shape of the first vane is a flat shape (the thickness in the circumferential direction is smaller than the length in the radial direction and the axial direction).
- the second vane described later has the same configuration.
- an intake port (not shown) through which intake gas from the refrigeration cycle passes through the cylinder chamber from the outer peripheral surface of the first cylinder 5a.
- the first cylinder 5a is provided with a discharge port (not shown) in which the vicinity of the edge of the circle forming the cylinder chamber which is a substantially circular space (end surface on the induction motor 100 side) is cut out.
- a first piston 9a that is rotatably fitted to the main shaft side eccentric portion 8c of the rotary shaft 8 and both axial end surfaces of the inner space of the first cylinder 5a that houses the first vane are separated from the main bearing 6.
- a compression chamber is formed by closing with the plate 27.
- the first cylinder 5a is fixed to the inner periphery of the sealed container 2.
- the second cylinder 5b also has a cylindrical inner space, and a second piston 9b (rolling piston) that is rotatably fitted to the sub-shaft side eccentric portion 8d of the rotating shaft 8 is provided in this inner space. It is done. Further, a second vane (not shown) that reciprocates according to the rotation of the countershaft side eccentric portion 8d is provided.
- the first piston 9a and the second piston 9b are simply defined as “pistons”.
- a suction port (not shown) through which suction gas from the refrigeration cycle passes penetrates the cylinder chamber from the outer peripheral surface of the second cylinder 5b.
- the second cylinder 5b is provided with a discharge port (not shown) in which the vicinity of the edge of the circle forming the cylinder chamber which is a substantially circular space (the end surface opposite to the induction motor 100) is cut out.
- a second piston 9b that is rotatably fitted to the sub-shaft side eccentric portion 8d of the rotary shaft 8 and both axial end surfaces of the internal space of the second cylinder 5b that houses the second vane are connected to the sub-bearing 7
- a compression chamber is formed by closing with the partition plate 27.
- the compression mechanism 500 is bolted to the first cylinder 5a and the main bearing 6, and is bolted to the second cylinder 5b and the auxiliary bearing 7, and then the partition plate 27 is sandwiched between them,
- the second cylinder 5b from the outside of the bearing 6 and the first cylinder 5a from the outside of the auxiliary bearing 7 are bolted and fixed in the axial direction.
- Discharge muffler 40a is attached to the main bearing 6 on the outer side (induction motor 100 side). High-temperature and high-pressure discharge gas discharged from a discharge valve (not shown) provided in the main bearing 6 enters the discharge muffler 40a at one end, and then enters the sealed container 2 from a discharge hole (not shown) of the discharge muffler 40a. Released.
- the discharge muffler 40b is attached to the outer side of the auxiliary bearing 7 (the side opposite to the induction motor 100). High-temperature and high-pressure discharge gas discharged from a discharge valve (not shown) provided in the sub-bearing 7 enters one end discharge muffler 40b, and then enters the sealed container 2 from a discharge hole (not shown) of the discharge muffler 40b. Released.
- An accumulator 31 is provided adjacent to the sealed container 2.
- the suction pipe 32a and the suction pipe 32b connect the first cylinder 5a, the second cylinder 5b, and the accumulator 31, respectively.
- the refrigerant gas compressed by the first cylinder 5a and the second cylinder 5b is discharged into the sealed container 2 and sent out from the discharge pipe 33 to the high-pressure side of the refrigeration cycle of the refrigeration air conditioner.
- the lubricating oil 26 (refrigerating machine oil) which lubricates each sliding part of the compression mechanism part 500 is stored in the bottom part in the airtight container 2.
- Lubricating oil is supplied to each sliding portion of the compression mechanism 500 by rotating the lubricating oil 26 accumulated at the bottom of the hermetic container 2 along the inner diameter of the rotating shaft 8 by the centrifugal force generated by the rotation of the rotating shaft 8. This is done through an oil supply hole (not shown) provided in the shaft 8. Sliding between the main shaft 8a and the main bearing 6, the main shaft side eccentric portion 8c and the first piston 9a, the sub shaft side eccentric portion 8d and the second piston 9b, and the sub shaft 8b and the sub bearing 7 from the oil supply hole. Lubricating oil is supplied to the part.
- the two-cylinder rotary compressor 400 configured as described above can achieve high efficiency by using the induction motor 100 (single phase induction motor) using the rotor 10 of the present embodiment.
- an air conditioner equipped with these compressors, blowers, etc. can be made highly efficient.
- An example of the air conditioner will be described with reference to FIGS. 19 and 20.
- FIG. 19 and 20 show the first embodiment
- FIG. 19 is a refrigerant circuit diagram of the air conditioner
- FIG. 20 is an exploded perspective view of the outdoor unit 600 of the air conditioner.
- the refrigerant circuit of the air conditioner includes a two-cylinder rotary compressor 400 that compresses refrigerant, a four-way valve 52 that switches the direction of refrigerant flow between cooling operation and heating operation, and a condenser during cooling operation.
- Outdoor heat exchanger 53 that operates as an evaporator during heating operation
- decompression device 54 electrostatic controlled expansion valve
- decompression device 54 electrostatically controlled expansion valve
- the indoor heat exchanger 55 operating as a condenser is sequentially connected to constitute a refrigeration cycle.
- the solid arrows in FIG. 19 indicate the direction of refrigerant flow during cooling operation. Moreover, the broken line arrow of FIG. 19 shows the direction through which the refrigerant
- the outdoor heat exchanger 53 is provided with an outdoor fan 56, and the indoor heat exchanger 55 is provided with an indoor fan 57 (cross flow fan).
- the high-temperature and high-pressure refrigerant compressed from the two-cylinder rotary compressor 400 is discharged and flows into the outdoor heat exchanger 53 through the four-way valve 52.
- outdoor heat exchanger 53 outdoor air is exchanged with the refrigerant while the outdoor air passes between the fins of the outdoor heat exchanger 53 and the tubes (heat transfer tubes) by the outdoor fan 56 provided in the air passage.
- the refrigerant is cooled to a high pressure liquid state, and the outdoor heat exchanger 53 functions as a condenser. Thereafter, the pressure is reduced through the decompression device 54, becomes a low-pressure gas-liquid two-phase refrigerant, and flows into the indoor heat exchanger 55.
- the indoor air passes through between the fins and the tubes (heat transfer tubes) of the indoor side heat exchanger 55 by driving of the indoor side blower 57 (cross flow fan) attached to the air passage.
- the indoor side blower 57 cross flow fan
- the indoor side blower 57 cross flow fan
- the indoor space is air-conditioned (cooled) by the air cooled by the indoor heat exchanger 55.
- the four-way valve 52 is inverted, so that the refrigerant flows in the opposite direction to the refrigerant flow during the cooling operation in the refrigeration cycle, and the indoor heat exchanger 55 serves as a condenser to perform outdoor heat exchange.
- Vessel 53 acts as an evaporator.
- the indoor space is air-conditioned (heated) by the air heated by the indoor heat exchanger 55.
- the structure of the outdoor unit 600 of an air conditioner will be described with reference to FIG.
- the outdoor unit 600 of the air conditioner includes a substantially L-shaped outdoor heat exchanger 53 in a plan view, a bottom plate 68 (base) that forms the bottom of the casing of the outdoor unit 600, and a flat plate that forms the top surface of the casing.
- Top panel 59 a front panel 60 that is substantially L-shaped in plan view that constitutes the front and one side of the housing, a side panel 61 that constitutes the other side of the housing, an air passage (blower room), and a machine Separator 62 that separates the chambers, electrical component box 63 that stores electrical components, two-cylinder rotary compressor 400 that compresses the refrigerant, refrigerant piping and refrigerant circuit components 64 that form a refrigerant circuit, and outdoor heat exchanger 53 It is comprised by the outdoor side fan 56 etc. which ventilate.
- the outdoor unit 600 of the air conditioner configured as described above is equipped with an outdoor fan 56 (blower) that uses the two-cylinder rotary compressor 400 of the present embodiment and the induction motor 100 of the present embodiment as an electric motor. By doing so, high efficiency of the air conditioner can be achieved.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Induction Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
回転子スロットは、
回転子外周部の近傍に形成される外周スロットと、
外周スロットに連通し、外周スロットの内側に形成される内周スロットとから構成され、
外周スロットの最内周の周方向の幅TCは、内周スロットの最外周の周方向の幅TDよりも小さく、
外周スロットの周方向の幅は回転子外周部に向かうに従い小さくなっていることを特徴とする。
図1乃至図3は比較のために示す図で、図1は一般的な誘導電動機200の横断面図、図2は一般的な誘導電動機200の固定子220の横断面図、図3は一般的な誘導電動機200の固定子鉄心221の横断面図である。
TA:外周スロット13aと回転子外周部との間の最短距離;
TB:内周スロット13bの中心側と回転子外周部との間の最短距離;
TC:外周スロット13aの最内周の周方向の幅;
TD:内周スロット13bの最外周の周方向の幅;
TE:内周スロット13bの端部側と回転子外周部との間の最短距離。
Claims (9)
- 回転子鉄心の回転子スロット内に非磁性且つ導電性の材料が充填されて形成されるかご形二次導体を有する誘導電動機の回転子において、
前記回転子スロットは、
当該回転子外周部の近傍に形成される外周スロットと、
前記外周スロットに連通し、前記外周スロットの内側に形成される内周スロットとから構成され、
前記外周スロットの最内周の周方向の幅TCは、前記内周スロットの最外周の周方向の幅TDよりも小さく、
前記外周スロットの周方向の幅は当該回転子外周部に向かうに従い小さくなっていることを特徴とする誘導電動機の回転子。 - 前記外周スロットの最内周の周方向の幅TCは、前記回転子鉄心を構成する電磁鋼板の板厚Tに対して、1.5×T≦TCの関係を満たすことを特徴とする請求項1記載の誘導電動機の回転子。
- 前記内周スロットの中心側と当該回転子外周部との間の最短距離をTB、前記内周スロットの端部側と当該回転子外周部との間の最短距離をTEとしたとき、
1.0mm≦TB≦2.5mm
1.0mm≦TE≦2.5mm
の関係を満たすことを特徴とする請求項1又は請求項2記載の誘導電動機の回転子。 - 前記内周スロットの中心側と当該回転子外周部との間の最短距離をTB、前記内周スロットの端部側と当該回転子外周部との間の最短距離をTEとしたとき、TB≦TEの関係を満たすことを特徴とする請求項1乃至3のいずれかに記載の誘導電動機の回転子。
- 前記外周スロットと当該回転子外周部との間の最短距離をTAとしたとき、前記TAを前記回転子鉄心を構成する電磁鋼板の板厚Tよりも小さくしたことを特徴とする請求項1乃至4のいずれかに記載の誘導電動機の回転子。
- 請求項1乃至5のいずれかに記載の誘導電動機の回転子を備えたことを特徴とする誘導電動機。
- 請求項6に記載の誘導電動機を備えたことを特徴とする圧縮機。
- 請求項6に記載の誘導電動機を備えたことを特徴とする送風機。
- 請求項7に記載の圧縮機と、請求項8記載の送風機と、を備えたことを特徴とする空気調和機。
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CN201080069704.4A CN103181066B (zh) | 2010-10-19 | 2010-10-19 | 感应电动机的转子、感应电动机、压缩机、送风机和空调 |
JP2012539503A JP5490251B2 (ja) | 2010-10-19 | 2010-10-19 | 誘導電動機の回転子及び誘導電動機及び圧縮機及び送風機及び空気調和機 |
PCT/JP2010/068407 WO2012053064A1 (ja) | 2010-10-19 | 2010-10-19 | 誘導電動機の回転子及び誘導電動機及び圧縮機及び送風機及び空気調和機 |
US13/823,225 US9166462B2 (en) | 2010-10-19 | 2010-10-19 | Rotor of induction motor, induction motor, compressor, air blower, and air conditioner |
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