CN101821925A - Electric motor for compressor, compressor, and freezing cycle device - Google Patents
Electric motor for compressor, compressor, and freezing cycle device Download PDFInfo
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- CN101821925A CN101821925A CN200880110655A CN200880110655A CN101821925A CN 101821925 A CN101821925 A CN 101821925A CN 200880110655 A CN200880110655 A CN 200880110655A CN 200880110655 A CN200880110655 A CN 200880110655A CN 101821925 A CN101821925 A CN 101821925A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- 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
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- Iron Core Of Rotating Electric Machines (AREA)
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- Applications Or Details Of Rotary Compressors (AREA)
Abstract
An object is to provide an electric motor for a compressor starting torque for which can be increased with the rise of the price of a component and a deterioration in efficiency in operation suppressed. The electric motor for the compressor is housed with a compressor element for compressing a cooling medium in an airtight container and connected to the compressor element via a driving axis to drive the compressor element. The electric motor for the compressor comprises a stator fixed to the inner periphery portion of the airtight container, a rotator (11) which is arranged on the inner side of the stator and which has a rotator core (11a), and a double squirrel-cage conductor which is cast in the rotator core (11a) and which is constituted by a secondary conductor comprising an outer layer secondary conductor and an inner layer secondary conductor and an end ring (32). In the rotator core (11a), an air hole (33) which is the passage of the cooling medium is provided. The inner diameter side of the end ring (32) is enlarged to a driving axis side in such a manner that the air hole (33) is sealed. The end ring (32) has a cutting (34) for allowing the air hole (33) to be communicated with the space of the airtight container so as not to seal the air hole (33).
Description
Technical field
The present invention relates to electric motor for compressor, compressor and refrigerating circulatory device.
Background technology
In the employed compressor of refrigerating air conditioning devices such as air conditioner,, use brushless DC motor, induction motor etc. as the motor of drive compression mechanism.In induction motor, mainly use common cage induction motor (single cage type).
In induction motor, have three phase induction motor and monocyclic-start induction motor.In compressor during the usability induction motor, because the starting torque of three phase induction motor is big, therefore the problem that relates to of starting is few.Yet in monocyclic-start induction motor, only the capacitor by the running usefulness that is connected with the outside can't obtain sufficient starting torque.Therefore, except that the capacitor of running usefulness, also appended the capacitor of employing (for example, with reference to patent documentation 1) sometimes.
In addition, also the phase difference that is wound on main winding on the stator of monocyclic-start induction motor and auxiliary winding can be staggered 90 ° (electric angles).
Moreover, also can increase rotor secondary resistance, increase starting torque.
Patent documentation 1: Japanese kokai publication hei 6-213167 communique
Yet, as above-mentioned patent documentation 1, owing to appended the shutter that the method for the capacitor of employing need open and close the capacitor of employing, so the problem that exists the parts price to uprise.
In addition, with the stagger method of 90 ° (electric angles) of the phase difference of main winding and auxiliary winding, exist because the groove number of stator core and the problem that can't realize.
Moreover, increase the secondary resistance of rotor and problem that the method that increases starting torque exists the efficient in the running of monocyclic-start induction motor to reduce.
Summary of the invention
The present invention proposes in order to solve aforesaid problem, its purpose is to provide a kind of efficient that can suppress in the surging of parts price and the running to reduce, and can increase electric motor for compressor and the compressor and the refrigerating circulatory device of starting torque.
Electric motor for compressor of the present invention is accommodated in the inside of closed container with the compressing member of compressed refrigerant, and links and the drive compression element by driving shaft and compressing member, and electric motor for compressor is characterised in that to possess:
Stator, it is fixed on the interior perimembranous of closed container;
Rotor, it is arranged on the inboard of stator, and has rotor core;
Two cage modle conductors, it is cast in the rotor core, and is made of the secondary conductor and the end ring that possess outer secondary conductor and internal layer secondary conductor,
Wherein, rotor core is provided with the ventilation hole of the path that becomes cold-producing medium,
The internal side diameter of end ring enlarges to drive shaft side in the mode of blocking ventilation hole, and is provided with the portion that dodges of the spatial communication that makes ventilation hole and closed container in order not block ventilation hole.
Electric motor for compressor of the present invention is characterised in that, constitutes the portion that dodges by the excision portion on the interior week that is arranged on end ring.
Electric motor for compressor of the present invention is characterised in that, constitutes the portion that dodges by the end ring ventilation hole that is arranged on the end ring.
Electric motor for compressor of the present invention is accommodated in the inside of closed container with the compressing member of compressed refrigerant, and links by driving shaft and compressing member and to drive this compressing member, it is characterized in that possessing:
Stator, it is fixed on the interior perimembranous of closed container;
Rotor, it is arranged on the inboard of stator, and has rotor core;
Two cage modle conductors, it is cast in the rotor core, and is made of the secondary conductor and the end ring that possess outer secondary conductor and internal layer secondary conductor,
Wherein, stator is provided with the stator ventilation hole of the path that becomes cold-producing medium,
Make the internal side diameter of end ring be positioned at driving shaft near.
Electric motor for compressor of the present invention is characterised in that stator possesses stator core, at the peripheral part of stator core excision portion is set, and between the excision portion of the peripheral part of closed container and stator core the stator ventilation hole is set.
Electric motor for compressor of the present invention is characterised in that rotor core possesses the axis hole chimeric with driving shaft, makes more than the big 8mm of diameter of internal diameter than axis hole of end ring.
Electric motor for compressor of the present invention is characterised in that the total volume of end ring is more than 13% of volume of rotor core.
Electric motor for compressor of the present invention is characterised in that compressing member possesses bearing, and electric motor for compressor is the one-sided bearing cantilever design of bearing supporting by compressing member, and the radical length in the space between stator and the rotor is as described below.
(1) at the external diameter of stator during less than 140mm, the radical length in space is below the 0.6mm;
(2) when the external diameter of described stator surpassed 140mm, the radical length in space was below the 0.8mm.
Electric motor for compressor of the present invention is characterised in that the periphery of the opposition side of the bearing of the compressing member of cutting rotor core makes its external diameter littler than the periphery of the bearing side of the compressing member of rotor core.
Compressor of the present invention is characterised in that, is equipped with the above-mentioned compressor motor.
Compressor of the present invention is characterised in that cold-producing medium uses R22.
Compressor of the present invention is characterised in that cold-producing medium uses R410a.
Compressor of the present invention is characterised in that cold-producing medium uses CO
2
Refrigerating circulatory device of the present invention is characterised in that, connects above-mentioned compressor, condenser, decompressor, evaporator by refrigerant piping.
The invention effect
Electric motor for compressor of the present invention reduces by the efficient that said structure can suppress in the surging of parts price and the running, and can increase starting torque.
Description of drawings
Fig. 1 is the figure of expression execution mode 1, is the longitudinal sectional view of rotary compressor 100.
Fig. 2 is the figure of expression execution mode 1, is the transverse sectional view of expression electric element 13.
Fig. 3 is the figure of expression execution mode 1, is the transverse sectional view of the rotor 11 of expression electric element 13.
Fig. 4 is the figure of expression execution mode 1, is the stereogram of the rotor 11 of expression electric element 13.
Fig. 5 is the figure of expression execution mode 1, is the end view that is provided with the rotor 11 of excision portion 34 on end ring 32.
Fig. 6 is the figure of expression execution mode 1, is the end view that is provided with the rotor 11 of end ring ventilation hole 32a.
Fig. 7 is the figure of expression execution mode 1, is near the transverse sectional view that is illustrated in the electric element 13 of example that stator 12 sides are provided with ventilation hole.
Fig. 8 is the figure of expression execution mode 1, is the transverse sectional view of the groove of rotor 11.
Fig. 9 is the figure of expression execution mode 1, is the transverse sectional view of the groove of rotor 11.
Figure 10 is the figure of expression execution mode 1, is expression end ring 32 and the figure of the relation of volume ratio, secondary resistance R 2 and the motor efficiency of rotor core 11a.
Figure 11 is the figure of expression execution mode 1, is the partial lateral cutaway view of electric element 13.
Figure 12 is the figure of expression execution mode 1, is the figure of the torque pulsation waveform of expression single cage type and two cage modles.
Figure 13 is the figure of expression execution mode 1, is the end view that is provided with the rotor 11 of cutting portion on the part of periphery.
Figure 14 is the figure of expression execution mode 1, is to use the pie graph of the refrigerating circulatory device of rotary compressor 100.
Symbol description:
1 main part
Ware container on 2
3 times ware containers
4 closed containers
5 cylinder portions
6 upper bearing (metal)s
7 lower bearings
8 driving shafts
9 rotary plungers
10 compressing members
11 rotors
The 11a rotor core
12 stators
The 12a stator core
The 12b stator slot
12c excision portion
13 electric elements
14 absorbing silencers
15 suction pipes
16 discharge pipes
17 glass terminals
18 single phase poaer supplies
20 windings
The 20a main winding
20b assists winding
21 leads
30 aluminum strips
The outer aluminum strip of 30a
30b internal layer aluminum strip
31 axis holes
32 end ring
32a end ring ventilation hole
33 ventilation holes
34 excision portions
35 stator ventilation holes
36 spaces
38 cutting portions
The outer groove of 40a
The 40b inner layer groove
51 cross valves
52 outdoor heat converters
53 decompressors
54 indoor heat converters
60 working capacitors
100 rotary compressors
Embodiment
Execution mode 1
Fig. 1 to Figure 14 is the figure of expression execution mode 1, Fig. 1 is the longitudinal sectional view of rotary compressor 100, Fig. 2 is the transverse sectional view of expression electric element 13, Fig. 3 is the transverse sectional view of the rotor 11 of expression electric element 13, Fig. 4 is the stereogram of the rotor 11 of expression electric element 13, Fig. 5 is the end view that is provided with the rotor 11 of excision portion 34 on end ring 32, Fig. 6 is the end view that is provided with the rotor 11 of end ring ventilation hole 32a, Fig. 7 is near the transverse sectional view that is illustrated in the electric element 13 of example that stator 12 sides are provided with ventilation hole, Fig. 8, Fig. 9 is the transverse sectional view of the groove of rotor 11, Figure 10 is the volume ratio of expression end ring 32 and rotor core 11a, the figure of the relation of secondary resistance R 2 and motor efficiency, Figure 11 is the partial lateral cutaway view of electric element 13, Figure 12 is the figure of the torque pulsation of expression single cage type and two cage modles, Figure 13 is the end view that is provided with the rotor 11 of cutting portion on the part of periphery, and Figure 14 is to use the pie graph of the refrigerating circulatory device of rotary compressor 100.
Present embodiment is characterised in that the structure of the rotor of the motor that uses in the compressor of rotary compressor etc.
Structure beyond the structure of the rotor of the motor in the rotary compressor is known structure.Therefore, with reference to the overall structure of the rotary compressor (example of compressor) of Fig. 1 brief description single cylinder.
As shown in Figure 1, rotary compressor 100 (example of compressor) is taken in compressing member 10, electric element 13 (being called electric motor for compressor), not shown refrigerating machine oil in closed container 4.Refrigerating machine oil is stored in the bottom in the closed container 4.The sliding part of refrigerating machine oil primary lubricant compressing member 10.Closed container 4 comprises main part 1, last ware container 2, following ware container 3.
Compressing member 10 comprises cylinder portion 5, upper bearing (metal) 6 (example of bearing), lower bearing 7 (example of bearing), driving shaft 8, rotary plunger 9, blade etc.Cylinder portion 5 is formed with discharge chambe in inside.The both ends open portion (axially) of upper bearing (metal) 6, lower bearing 7 closed cylinder portions 5.And, the compressive load that eccentric part bore of upper bearing (metal) 6, lower bearing 7 supporting driving shafts 8.Rotary plunger 9 is chimeric with the eccentric part of driving shaft 8.Blade moves back and forth in the groove of cylinder portion 5, and front end and rotary plunger 9 join.Form discharge chambe by cylinder portion 5, rotary plunger 9 and blade.
Details is as described below, and rotor 11 is two cage-type rotors of cast aluminium system.Rotor 11 is fixed with driving shaft 8 within it week.
On the winding 20 of stator 12, be connected with lead 21.Lead 21 is connected with glass terminal 17.Glass terminal 17 is fixed on the closed container 4 by welding.From the power supply of outside to glass terminal 17 supply capabilities.
At this, the basic conception of present embodiment is described in advance.In the electric element 13 of the rotary compressor 100 that single-phase AC power is used, use monocyclic-start induction motor.In order to suppress the parts price, monocyclic-start induction motor adopts the capacitor motor of the capacitor that service firing only uses.It is little that capacitor motor and three phase induction motor are compared starting torque.And the starting torque of capacitor motor is relevant with the secondary resistance of rotor 11 (cage-type rotor).The starting torque of capacitor motor is big more when the secondary resistance of rotor 11 is big more.Yet the secondary resistance of rotor 11 is also relevant with efficient in the running of capacitor motor.When the secondary resistance of rotor 11 is big, the decrease in efficiency in the running of capacitor motor.
When the resistance of aluminum strip is the resistance of Rb, end ring when being Rr, the secondary resistance R 2 of rotor 11 is expressed from the next.Wherein, k1 is a constant.
R2＝k1×(Rb+Rr) (1)
When rotor 11 was common cage-type rotor (single cage type), the resistance R b of aluminum strip changed when slide (the winding 20 formed rotating magnetic fields of stator 12 and the relative velocity of rotor 11) big starting and during the little running of slip hardly.When the radial depth of aluminum strip was dark, the resistance R b during with starting compared, and the resistance R b during running diminishes more or less.
Consider the efficient in the running, the secondary resistance R 2 of rotor 11 can not be too big.Therefore, relevant with secondary resistance R 2 starting torque is less.
Therefore, append the capacitor of employing usually and increase starting torque.Yet when having appended the capacitor of employing, the parts price rises.
Groped the parts price is risen and also do not making the method for improving starting torque under the condition of the decrease in efficiency in the running.
Its result has distinguished that two cage-type rotors are fit to.Two cage-type rotors have feature shown below.
That is, two cage-type rotors possess the little inner layer groove of the big outer groove of resistance (slot that is provided with along the periphery of rotor core) and resistance (than outer groove near the part in the interior week of rotor core groove along outer groove setting).As the general feature of the induction motor with two cage-type rotors, sliding frequency uprises during starting.Therefore, magnetic flux flows along the rotor outer circumferential side.Mainly, secondary current increases starting torque in the high outer groove of resistance by being flowed.And when turning round usually, sliding frequency is low.Therefore, secondary current flows to outer groove and these both sides of inner layer groove.Therefore, the secondary resistance decreasing, the secondary copper loss reduces.Thus, has the characteristic that can realize high efficiency.
Embodiment when two cage-type rotors being applicable to the rotor 11 of rotary compressor 100 carries out following explanation.
At first, by Fig. 2 to Fig. 4, the structure of the electric element 13 of monocyclic-start induction motor is used in simple declaration.Electric element 13 has stator 12 and in the inside of stator 12 rotor rotated 11.
With thickness of slab is the shape of the electromagnetic steel plate stamping-out of 0.1～1.5mm for regulation, stacked vertically, and fixes by riveted joint or welding etc. and to make stator core 12a.Be provided with the 12c of excision portion on the outer peripheral face of stator core 12a, the 12c of this excision portion becomes the periphery toroidal is cut into the roughly roughly line part of linearity.
When using monocyclic-start induction motor in rotary compressor 100, stator 12 hot chargings are on the closed container cylindraceous 4 of rotary compressor 100, and described monocyclic-start induction motor has used the stator 12 of Fig. 2.Therefore, need the 12c of excision portion in order between stator 12 and closed container 4, to guarantee the path of cold-producing medium.
In stator slot 12b, be inserted with the main winding 20a of concentric winding method or overlapping winding method.By circulating current in main winding 20a, produce the main winding magnetic flux.In addition, in stator slot 12b, be inserted with the auxiliary winding 20b of concentric winding method or overlapping winding method in the same manner with main winding 20a.Produce auxiliary winding magnetic flux by circulating current in auxiliary winding 20a.
Usually, main winding magnetic flux and auxiliary winding magnetic flux angulation are 90 degree (at these, because number of poles is two utmost points, so mechanical angle also is 90 degree) by electric angle.Working capacitor (not shown) and auxiliary winding 20b are connected in series, and main winding and this structure that is connected in series is connected side by side.Then, its two ends are connected with single phase alternating current power supply.Thus, can produce main winding magnetic flux and auxiliary winding magnetic flux, and produce the rotating magnetic field of two utmost points.
In addition, rotor 11 possesses rotor core 11a and two cage modle conductor.Two cage modle conductors comprise aluminum strip 30 and end ring 32.Aluminum strip 30 comprises the outer aluminum strip 30a (outer secondary conductor) that is cast in the outer groove 40a and is cast into internal layer aluminum strip 30b (internal layer secondary conductor) in the inner layer groove 40b.End ring 32 (two) is arranged on the axial two ends of rotor 11.End ring 32 is ring-type (annular) according to literal understanding.End ring 32 links with the two ends of each aluminum strip 30 (outer aluminum strip 30a, internal layer aluminum strip 30b).
With stator core 12a similarly, be the shape of the electromagnetic steel plate stamping-out of 0.1～1.5mm with thickness of slab for regulation, stacked vertically and make rotor core 11a.Usually, rotor core 11a is many from carrying out stamping-out with stator core 12a identical materials.But, also can change the material of rotor core 11a and stator core 12a.
In Fig. 2, the outer groove 40a and the inner layer groove 40b that constitute two cage type shapes separate by the interior all thin-walleds (being arranged on the thin-walled portion between outer groove 40a and the inner layer groove 40b) that are made of electromagnetic steel plate.The outer aluminum strip 30a of outer groove 40a inside and the internal layer aluminum strip 30b of inner layer groove 40b inside are the structures of carrying out electrical ties by end ring 32.
As mentioned above, use the electric element 13 (monocyclic-start induction motor) of two cage-type rotors, the outer aluminum strip 30a of current direction when starting.Electric current flows to internal layer aluminum strip 30b hardly.Therefore, it is big that the resistance R b of aluminum strip 30 becomes, and secondary resistance R 2 becomes big.Shown in (1) formula, the resistance R b of secondary resistance R 2 and aluminum strip 30, the resistance R r of end ring 32 with proportional.The secondary resistance R 2 that needs in order to export desired starting torque can obtain by the resistance R b of aluminum strip 30.Therefore, the resistance R r of end ring 32 is little of well.
For the efficient in the running that improves electric element 13 (monocyclic-start induction motor), secondary resistance R 2 is little of well.In the running of electric element 13 (monocyclic-start induction motor), from above-mentioned reason as can be known, electric current also flows to internal layer aluminum strip 30b.Correspondingly, the area of aluminum strip 30 increases, and the resistance R b of aluminum strip 30 diminishes when moving in the running.
When the resistance R r of end ring 32 also hour, secondary resistance R 2 further reduces.
When using common cage-type rotor (single cage type) in electric element 13, the resistance R b of aluminum strip 30 changes when starting and during running hardly.Therefore, in order to export desired starting torque, can not make the resistance R r of end ring 32 too small.
By use two cage-type rotors in electric element 13, the secondary resistance R 2 that needs for the starting torque of exporting requirement can obtain by the resistance R b of aluminum strip 30.Therefore, can dwindle the resistance R r of end ring 32, improve the efficient in the running.
Increase the volume of end ring 32 for the resistance R r that reduces end ring 32.When increasing the volume of end ring 32, be difficult to the periphery of end ring 32 is radially extended.This is because the mold of end ring 32 need be pushed near the pressing quantity of peripheral part of the axial end face of rotor core 11a.That is, end ring 32 can't enlarge along the radial outside of rotor 11.
Therefore, making the big remaining method of volume change of end ring 32 is exactly that end ring 32 is extended to the radially inner side of rotor 11.
Make end ring 32 be subjected to various restrictions to the situation of the radially inner side extension of rotor 11.
(1) on the rotor 11 of rotary compressor 100, offers the ventilation hole 33 (Fig. 2, Fig. 3) of the path that becomes cold-producing medium usually.When the radially inner side that makes end ring 32 to rotor 11 extends, block this ventilation hole 33.Therefore, need dodge portion's (making the part of ventilation hole 33 and external communications), so that end ring 32 is not blocked ventilation hole 33.
(2) when making rotor 11 by cast aluminium, the pressing quantity that the interior perimembranous of mold is pushed rotor core 11a needs several millimeters at least.For example, pressing quantity need be for more than the 4mm.Therefore, the internal diameter of end ring 32 need be more than the big 8mm of diameter than the axis hole 31 (Fig. 2, Fig. 3) of rotor 11.
Because the internal side diameter of end ring 32 enlarges to drive shaft side in the mode of blocking ventilation hole 33, therefore in order not block ventilation hole 33, the portion that dodges need be set on end ring 32 (make the part of ventilation hole 33 and external communications, for example make the part of the spatial communication in ventilation hole 33 and the closed container 4), the following describes such example.
Example shown in Figure 5 is to form the portion of dodging by the excision portion 34 that is provided with in interior week at end ring 32.Excision portion 34 is formed on the part suitable with the ventilation hole 33 of end ring 32.Excision portion 34 is arranged to make ventilation hole 33 to expose.On rotor shown in Figure 5 11, offer four ventilation holes 33.Therefore, excision portion 34 also is located at everywhere.
In addition, the pressing quantity that the interior perimembranous of the mold when making rotor 11 by cast aluminium is pushed rotor core 11a forms the interior week of end ring 32 and the distance L of axis hole 31 more than the 4mm.
The location of the ventilation hole 33 of rotor core 11a and the excision portion 34 of end ring 32 can be provided with the location by the axial forward end at excision portion 34 counterparts of mold and realize with projection.The ventilation hole 33 of rotor core 11a is inserted with projection in the location and position.
The aluminum strip 30 of the common rotor 11 of monocyclic-start induction motor is setovered.That is, aluminum strip 30 is not parallel and tilt with the axle of rotor 11.Setover is that the voltage of the high order harmonic component composition (especially groove high order harmonic component) in the magnetic field that produces for the winding 20 that makes stator 12 is not responded to aluminum strip 30.
When the aluminum strip 30 of rotor 11 is biased, be difficult to the location of aluminium mold is inserted with projection the ventilation hole 33 of rotor core 11a.Therefore, the length of the regulation at the axial both ends of aluminum strip 30 (location than aluminium mold is long with the axial length of projection) is parallel with axle.Thus, the location of aluminium mold can be inserted smoothly the ventilation hole 33 of rotor core 11a with projection.But, even the aluminum strip 30 of rotor 11 is biased on whole length, as long as the location that dwindles the aluminium mold just can be inserted with the diameter of projection.In this case, the positioning accuracy of the ventilation hole 33 of rotor core 11a and the excision portion 34 of end ring 32 variation a little.
Because the internal side diameter of end ring 32 enlarges to drive shaft side in the mode of blocking ventilation hole 33, therefore, in order not block ventilation hole 33 portion that dodges is set on end ring 32 and (makes the part of ventilation hole 33 and external communications, for example make the part of the spatial communication in ventilation hole 33 and the closed container 4), by Fig. 6 the example of such other is described.
As shown in Figure 6, form the end ring ventilation hole 32a that is communicated with the ventilation hole 33 of rotor core 11a.When cast aluminium, locate and form end ring ventilation hole 32a in order to be communicated with the ventilation hole 33 of rotor core 11a.On rotor shown in Figure 6 11, offer four ventilation holes 33.Therefore, end ring ventilation hole 32a also is arranged on everywhere.
In addition, identical with the situation of Fig. 5, the pressing quantity that the interior perimembranous of the mold when making rotor 11 by cast aluminium is pushed rotor core 11a forms the interior week of end ring 32 and the distance L of axis hole 31 more than the 4mm.
Moreover the ventilation hole 33 of rotor core 11a and the location of the end ring ventilation hole 32a of end ring 32 can be provided with the location by the axial forward end at the end ring ventilation hole 32a of aluminium mold counterpart and realize with projection.The ventilation hole 33 of rotor core 11a is inserted with projection in the location and position.
Therefore, the diameter of end ring ventilation hole 32a is than the slightly larger in diameter of the ventilation hole 33 of rotor core 11a.
In Fig. 5, Fig. 6, represented on rotor 11, to be provided with the example of ventilation hole 33.As shown in Figure 7, also ventilation hole can be arranged on stator 12 sides.As shown in Figure 7, the periphery at stator core 12a is provided with the 12c of excision portion.In Fig. 7, the 12c of excision portion is arranged on six places.Between the 12c of excision portion of stator core 12a and closed container 4 (main part 1), form the space.This space becomes stator ventilation hole 35.Space 36 between the stator ventilation hole 35 at described six places and stator 12 and the rotor 11 (radially being of a size of for example about 0.5mm) becomes the path of the gas refrigerant of the high temperature of discharging from compressing member 10, high pressure.Discharge to outside (kind of refrigeration cycle) from discharge pipe 16 by the high temperature of electric element 13, the gas refrigerant of high pressure.
In Fig. 7, though be provided with the 12c of excision portion in the periphery of stator core 12a, also can be and hold on (part in the outside of stator slot 12b) at the iron core back of the body of stator core 12a stator ventilation hole 35 is set not in periphery.
So, by ventilation hole (stator ventilation hole 35) is arranged on stator 12 sides, can enlarge end ring 32 (internal side diameter that makes end ring 32 extends near the mode that is positioned at the driving shaft).And, owing to the refrigerant flow by stator 12 increases, therefore also have the winding 20 that cools off stator 12 and the effect that the inhibition temperature rises.
In addition, in Fig. 7, stator 12 has omitted groove 12b etc.The groove shape of rotor 11 is as Fig. 8, so-called two cage modles shown in Figure 9.Outer groove 40a and inner layer groove 40b can link as shown in Figure 8, also can not link as shown in Figure 9.
Next, ratio (with it as the end ring volume ratio) and the secondary resistance R 2 of rotor 11 and the relation between the motor efficiency of the volume of the volume of total of end ring 32 of both sides and rotor core 11a are described by Figure 10.
Such as already described, the secondary resistance R 2 of rotor 11 is represented by (1) formula.That is the resistance R r's of the resistance R b of secondary resistance R 2 and aluminum strip and end ring, with proportional.Therefore, reduce the resistance R r of end ring even increase the end ring volume ratio, secondary resistance R 2 also converges to the resistance R b of aluminum strip.
When the end ring volume ratio increases, increase motor efficiency by reducing secondary resistance R 2.Yet secondary resistance R 2 is near lower limit (convergence), and motor efficiency also converges to higher limit.
Therefore, end ring volume ratio preference is as being more than 13%.
Next, the magnetic attraction of illustration between stator 12 and rotor 11.The magnetic attraction P that acts between stator 12 and the rotor 11 is expressed from the next.
P＝k2×W×Bm2(2)
Wherein, k2 is a constant, and W is the width unshakable in one's determination (axial length) of stator core 12a, and Bm is the peakflux density in the space 36 (distance between stator 12 and the rotor 11 is with reference to Figure 11).
By using two cage-type rotors, can reduce the secondary resistance R 2 of rotor 11 as rotor 11.Therefore, can increase stalling torque (being called) from the breakdown torque of starting beginning near non-loaded rotating speed.Therefore, if stalling torque is constant, then can carry out the peakflux density Bm in space 41 is reduced the design (changing the specification of the winding 20 of stator 12) of respective amount.
If reduce the peakflux density Bm in space 36, then the magnetic attraction P that acts between stator 12 and the rotor 11 according to (2) formula reduces.As shown in Figure 1, electric element 13 only is the one-sided structure of upper bearing (metal) 6 supportings by compressing member 10.That is, the bearing of electric element 13 is a cantilever design.Therefore, do not carry out whirling by rotor 11 parts (top of Fig. 1 rotor 11) of the opposition side of upper bearing (metal) 6 sides of bearing supporting.The whirling of this rotor 11 is relevant with magnetic attraction P.When magnetic attraction P was big, it is big that the whirling of rotor 11 also becomes.
So, because there is the whirling of rotor 11 in rotary compressor 100, so gap lengths (radical length in space 36) is a both arms supporting structure duration than the bearing of electric element 13.
By using two cage-type rotors, can reduce to act on the magnetic attraction P between stator 12 and the rotor 11 as rotor 11.Therefore, compare as the situation of rotor 11, can shorten gap lengths with using single cage type rotor (common cage modle).For example, the gap lengths between stator 12 and the rotor 11 (radical length in space) can be formed following like that.
(1) be 140mm when following at the external diameter of stator 12, gap lengths is below the 0.6mm;
(2) when the external diameter of stator 12 surpassed 140mm, gap lengths was below the 0.8mm.
In addition, as shown in figure 12, overlapping in the torque that electric element 13 (induction motor) produces have a high order harmonic component composition (torque pulsation).In Figure 12, transverse axis is load torque [Nm], and the longitudinal axis is torque pulsation [%] (with respect to the ratio of basic wave torque).When relatively two cage modles and single cage type (common cage modle), in the roughly whole zone of load torque, the torque pulsation of two cage modles is littler than the torque pulsation of single cage type.
By rotor 11 being formed two cage modles, magnetic attraction P (P=k2 * W * Bm2) reduce under same stalling torque, the whirling that can suppress rotor 11 can form gap lengths 0.6mm accordingly with the external diameter of stator 12 or below the 0.8mm, this situation is narrated.Moreover, as shown in figure 13, the part (opposition sides of upper bearing (metal) 6 sides of Fig. 1) of the periphery of rotor core 11a is carried out the ormal weight cutting and formed cutting portion 38.And, if the external diameter of the gap lengths of cutting portion 38 and stator 12 formed 0.6mm accordingly or below the 0.8mm, then can further reduce the gap lengths of cutting portion 38 part (the part of Fig. 1) in addition, and improve motor efficiency near upper bearing (metal) 6.
The groove 40 of the rotor core 11a of two cage-type rotors comprises outer groove 40a and inner layer groove 40b.Therefore, at groove 40 part places, (rotor core 11a) unshakable in one's determination is big with the contact area of secondary conductor (outer aluminum strip 30a and internal layer aluminum strip 30b), the degradation of insulation between iron core and the secondary conductor, therefore handle or after heat by turning blue, carry out insulation unshakable in one's determination and secondary conductor.What is called is turned blue, and to handle be that rotor core 11a is heat-treated and forms the processing of oxidation overlay film on rotor core 11a surface.So-called after heat is a heating rotor 11 after conductor is carried out mold, is immersed in afterwards in the liquid such as water to carry out chilling, forms the gap between secondary conductor in groove 40 and the rotor core 11a, the processing that rotor core and secondary conductor are insulated.
When the degradation of insulation between rotor core 11a and the secondary conductor, in the torque waveform (with respect to the torque characteristics of rotating speed) of electric element 13, produce loose.When generation is lax in the torque waveform at electric element 13, can cause the poor starting of rotary compressor 100.
Cold-producing medium as the kind of refrigeration cycle of the rotary compressor 100 of packing into also uses the R22 cold-producing medium sometimes.In this case, when using the R22 cold-producing medium, winding 20 temperature of stator 12 rise easily.Therefore, motor is difficult to miniaturization.Because by in electric element 13, using two cage-type rotors to improve efficient, therefore can be under miniaturization or same size the raising ability.
In addition, in the cold-producing medium of the kind of refrigeration cycle of the rotary compressor 100 of packing into, use the R410a cold-producing medium.When using the R410a cold-producing medium, to compare with the R22 cold-producing medium, refrigerating capacity increases about 10%.Therefore, use the situation of R410a cold-producing medium to compare with the R22 cold-producing medium, the torque of electric element 13 also needs to increase this amount (about 10%).In this case, the torque of using two cage-type rotors to be produced in rotor 11 improves effectively.
Only by with respect to the rotary compressor 100 that uses the R22 cold-producing medium with refrigerating capacity than selected motor, be replaced into pair cage-type rotors from existing single cage type rotor, just can constitute the electric element 13 of R410a cold-producing medium correspondence.
Moreover, use CO as the cold-producing medium of the kind of refrigeration cycle of the rotary compressor 100 of packing into
2(R744) cold-producing medium.CO
2The compression ratio of cold-producing medium is very high, and is current, uses CO
2The electric element 13 of the rotary compressor 100 of cold-producing medium uses brushless DC motor to become main tendency.By using CO
2Use two cage electromotors in the rotary compressor 100 of cold-producing medium, compressor size is maximized and realize having carried the constant speed induction motor, used CO
2The rotary compressor 100 of cold-producing medium.
Figure 14 is to use the structure chart of the refrigerating circulatory device of rotary compressor 100.Refrigerating circulatory device for example is an air conditioner.Rotary compressor 100 is connected with single phase poaer supply 18.Between the auxiliary winding 20b of the monocyclic-start induction motor of rotary compressor 100 and single phase poaer supply 18, be connected with working capacitor 60.To rotary compressor 100 supply capabilities, drive rotary compressor 100 from single phase poaer supply 18.Refrigerating circulatory device (air conditioner) comprises rotary compressor 100, the cross valve 51 that switches the flow direction of cold-producing medium, outdoor heat converter 52, decompressor 53, indoor heat converter 54 etc.Above-mentioned parts connect by refrigerant piping.
For example when cooling operation, its cold-producing medium is mobile like that shown in the arrow of Figure 14 for refrigerating circulatory device (air conditioner).And indoor heat converter 54 is an evaporator.
Though not shown, when refrigeration was revolved the heating running of loop device (air conditioner), cold-producing medium flowed to the rightabout of the arrow of Figure 11.Switch the flow direction of cold-producing medium by cross valve 51.At this moment, outdoor heat converter 52 is an evaporator.And indoor heat converter 54 is a condenser.
In addition, use with R134a, R410a, R407c etc. as the IIFC series coolant of representative and with R744 (CO
2), R717 (ammonia), R600a (iso-butane), R290 (propane) etc. for the natural cold-producing medium of representative as cold-producing medium.Use with alkyl benzene series oil as the oil of the weak intermiscibility of representative or with esterised oil as the oil of the intermiscibility of representative as refrigerating machine oil.Compressor can also use reciprocating type, vortex etc. except that rotary (rotary type).
By in kind of refrigeration cycle, using the rotary compressor 100 that is equipped with two cage-type rotors, can realize raising, miniaturization, the low price of the performance of refrigerating circulatory device.
In the above description, though represented to use the example of aluminium, also can replace aluminium and use copper as the material of cage modle winding.
In addition, although understand the monocyclic-start induction motor that uses two cage-type rotors, even but be applicable to that ferraris motor also can play same effect.
The electric motor for compressor of embodiments of the present invention constitutes the portion of dodging by utilize the excision portion be provided with on the interior week of end ring, can not block the ventilation hole of rotor core and enlarges end ring.
The electric motor for compressor of embodiments of the present invention, the end ring ventilation hole that is arranged on the end ring by utilization constitutes the portion of dodging, and can not block the ventilation hole of rotor core and further enlarges end ring.
The electric motor for compressor of embodiments of the present invention is accommodated in the inside of closed container with the compressing member of compressed refrigerant, and link and the drive compression element by driving shaft and compressing member, described electric motor for compressor possesses: stator, and it is fixed on the interior perimembranous of closed container; Rotor, it is arranged on the inboard of stator, and has rotor core; Two cage modle conductors, it is cast in the rotor core, and constitute by the secondary conductor and the end ring that possess outer secondary conductor and internal layer secondary conductor, on stator, be set to the stator ventilation hole of the path of cold-producing medium, and the internal side diameter that makes end ring be positioned at driving shaft near, thus, can further enlarge end ring.Shown in (1) formula, the secondary resistance R 2 of rotor 11 be the resistance R b of aluminum strip and end ring resistance R r's and.By enlarging end ring, the resistance R r of end ring reduces, and consequently the secondary resistance R 2 of rotor 11 reduces.When the secondary resistance R 2 of rotor 11 reduced, the efficient in the running of electric motor for compressor improved.
The stator of the electric motor for compressor of embodiments of the present invention possesses stator core, peripheral part in stator core is provided with excision portion, between the excision portion of the peripheral part of closed container and stator core, the stator ventilation hole is set, thus, the winding that utilizes cold-producing medium by the stator ventilation hole to cool off stator suppresses temperature and rises.
The rotor core of the electric motor for compressor of embodiments of the present invention possesses the axis hole chimeric with driving shaft, makes more than the big 8mm of diameter of internal diameter than axis hole of end ring, thus, the pressing quantity of the mould in the time of can guaranteeing the mold of two cage modle conductors.
The total volume of the end ring of the electric motor for compressor of embodiments of the present invention is more than 13% of volume of rotor core, thus, can improve motor efficiency.
The compressing member of the electric motor for compressor of embodiments of the present invention possesses bearing, electric motor for compressor is the one-sided bearing cantilever design of bearing supporting by compressing member, the radical length in the space between stator and the rotor is as described below, thus, can improve motor efficiency.
(1) at the external diameter of stator during less than 140mm, the radical length in space is below the 0.6mm;
(2) when the external diameter of stator surpassed 140mm, the radical length in space was below the 0.8mm.
The electric motor for compressor of embodiments of the present invention, the periphery of opposition side of the bearing of the compressing member by the cutting rotor core, make its external diameter littler than the periphery of the bearing side of the compressing member of rotor core, can further shorten the radical length in the space between stator and the rotor, improve motor efficiency.
The compressor of embodiments of the present invention is equipped with the above-mentioned compressor motor, thus, can realize economizing the energy, miniaturization and low price.
The compressor of embodiments of the present invention is even when using R22 as cold-producing medium, also can improve ability under miniaturization or same size.
The compressor of embodiments of the present invention when using R410a as cold-producing medium, uses two cage-type rotors to improve effectively as the torque that rotor produced.
The compressor of embodiments of the present invention is even using CO
2During as cold-producing medium, compressor size is maximized and realize being equipped with constant speed motor use CO
2The compressor of cold-producing medium.
The refrigerating circulatory device of embodiments of the present invention connects above-mentioned compressor, condenser, decompressor, evaporator by utilizing refrigerant piping, can realize raising, miniaturization, the low price of the performance of refrigerating circulatory device.
Claims (19)
1. electric motor for compressor, its compressing member with compressed refrigerant is accommodated in the inside of closed container, and links by driving shaft and described compressing member and to drive this compressing member, and described electric motor for compressor is characterised in that to possess:
Stator, it is fixed on the interior perimembranous of described closed container;
Rotor, it is arranged on the inboard of described stator, and has rotor core;
Two cage modle conductors, it is cast in the described rotor core, and is made of the secondary conductor and the end ring that possess outer secondary conductor and internal layer secondary conductor,
Described rotor core is provided with the ventilation hole of the path that becomes described cold-producing medium,
The internal side diameter of described end ring enlarges to described drive shaft side in the mode of blocking described ventilation hole, and is provided with the portion that dodges of the spatial communication that makes described ventilation hole and described closed container in order not block described ventilation hole.
2. electric motor for compressor according to claim 1 is characterized in that,
The excision portion in the interior week by being arranged on described end ring constitutes the described portion that dodges.
3. electric motor for compressor according to claim 1 is characterized in that,
Constitute the described portion that dodges by the end ring ventilation hole that is arranged on the described end ring.
4. electric motor for compressor, its compressing member with compressed refrigerant is accommodated in the inside of closed container, and links by driving shaft and described compressing member and to drive this compressing member, it is characterized in that possessing:
Stator, it is fixed on the interior perimembranous of described closed container;
Rotor, it is arranged on the inboard of described stator, and has rotor core;
Two cage modle conductors, it is cast in the described rotor core, and is made of the secondary conductor and the end ring that possess outer secondary conductor and internal layer secondary conductor,
Described stator is provided with the stator ventilation hole of the path that becomes described cold-producing medium,
Make the internal side diameter of described end ring be positioned at described driving shaft near.
5. electric motor for compressor according to claim 4 is characterized in that,
Described stator possesses stator core, at the peripheral part of described stator core excision portion is set, and between the excision portion of the peripheral part of described closed container and described stator core described stator ventilation hole is set.
6. electric motor for compressor according to claim 1 is characterized in that,
Described rotor core possesses the axis hole chimeric with described driving shaft, makes more than the big 8mm of diameter of internal diameter than described axis hole of described end ring.
7. electric motor for compressor according to claim 4 is characterized in that,
Described rotor core possesses the axis hole chimeric with described driving shaft, makes more than the big 8mm of diameter of internal diameter than described axis hole of described end ring.
8. electric motor for compressor according to claim 1 is characterized in that,
The total volume of described end ring is more than 13% of volume of described rotor core.
9. electric motor for compressor according to claim 4 is characterized in that,
The total volume of described end ring is more than 13% of volume of described rotor core.
10. electric motor for compressor according to claim 1 is characterized in that,
Described compressing member possesses bearing, and in described electric motor for compressor,, bearing one-sided by the bearing supporting of described compressing member is cantilever design,
The radical length in the space between described stator and the described rotor is as follows,
(1) at the external diameter of described stator during less than 140mm, the radical length in described space is below the 0.6mm;
(2) when the external diameter of described stator surpassed 140mm, the radical length in described space was below the 0.8mm.
11. electric motor for compressor according to claim 10 is characterized in that,
Cut the periphery of opposition side of bearing of the described compressing member of described rotor core, make its external diameter littler than the periphery of the bearing side of the described compressing member of described rotor core.
12. a compressor is characterized in that,
Be equipped with the described electric motor for compressor of claim 1.
13. compressor according to claim 12 is characterized in that,
Cold-producing medium uses R22.
14. compressor according to claim 12 is characterized in that,
Cold-producing medium uses R410a.
15. compressor according to claim 12 is characterized in that, cold-producing medium uses CO
2
16. a refrigerating circulatory device is characterized in that,
Connect the described compressor of claim 12, condenser, decompressor, evaporator by refrigerant piping.
17. a refrigerating circulatory device is characterized in that,
Connect the described compressor of claim 13, condenser, decompressor, evaporator by refrigerant piping.
18. a refrigerating circulatory device is characterized in that,
Connect the described compressor of claim 14, condenser, decompressor, evaporator by refrigerant piping.
19. a refrigerating circulatory device is characterized in that,
Connect the described compressor of claim 15, condenser, decompressor, evaporator by refrigerant piping.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007335439 | 2007-12-27 | ||
| JP2007-335439 | 2007-12-27 | ||
| PCT/JP2008/053235 WO2009084245A1 (en) | 2007-12-27 | 2008-02-26 | Electric motor for compressor, compressor, and freezing cycle device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101821925A true CN101821925A (en) | 2010-09-01 |
Family
ID=40823981
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880110655A Pending CN101821925A (en) | 2007-12-27 | 2008-02-26 | Electric motor for compressor, compressor, and freezing cycle device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2009084245A1 (en) |
| CN (1) | CN101821925A (en) |
| WO (1) | WO2009084245A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545505A (en) * | 2010-12-28 | 2012-07-04 | 三菱电机株式会社 | Induction motor, compressor and refrigerating cycle apparatus |
| CN107171481A (en) * | 2017-07-25 | 2017-09-15 | 濮阳市华南重工科技有限公司 | A kind of vibrohammer threephase asynchronous |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130553B (en) * | 2010-01-14 | 2013-09-04 | 三菱电机株式会社 | Single-phase induction motor for compressor, compressor thereof and refrigeration circulation device |
| US9343930B2 (en) | 2012-05-25 | 2016-05-17 | Baldor Electric Company | Segmented stator assembly |
| JP5835205B2 (en) | 2012-12-20 | 2015-12-24 | 株式会社デンソー | Electric compressor |
| JP6172961B2 (en) * | 2013-02-08 | 2017-08-02 | 三菱電機株式会社 | Electric motor, compressor, and refrigeration cycle apparatus |
| CN112055928B (en) | 2018-03-27 | 2023-04-28 | 三菱电机株式会社 | Motor, compressor, blower and refrigerating air conditioner |
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| JPS61244248A (en) * | 1985-04-22 | 1986-10-30 | Toshiba Corp | Preparation of cast rotor |
| US4782260A (en) * | 1987-02-27 | 1988-11-01 | General Electric Company | Closed slot rotor construction |
| JPH0241672U (en) * | 1988-09-08 | 1990-03-22 | ||
| JP3534432B2 (en) * | 1993-09-17 | 2004-06-07 | 株式会社日立製作所 | Hermetic electric compressor |
| JPH104658A (en) * | 1996-06-13 | 1998-01-06 | Hitachi Ltd | Induction motor |
| JPH10281573A (en) * | 1997-02-10 | 1998-10-23 | Daikin Ind Ltd | Freezer |
| JP3594570B2 (en) * | 2001-06-29 | 2004-12-02 | 三洋電機株式会社 | Two-stage compression type compressor and refrigeration system using the same |
| JP3650351B2 (en) * | 2001-09-07 | 2005-05-18 | 三菱電機株式会社 | Cage type induction motor rotor and cage type induction motor |
| JP2004201428A (en) * | 2002-12-19 | 2004-07-15 | Matsushita Electric Ind Co Ltd | Motor |
| JP4559872B2 (en) * | 2005-02-22 | 2010-10-13 | 三菱電機株式会社 | Single-phase motor and hermetic compressor |
-
2008
- 2008-02-26 CN CN200880110655A patent/CN101821925A/en active Pending
- 2008-02-26 WO PCT/JP2008/053235 patent/WO2009084245A1/en active Application Filing
- 2008-02-26 JP JP2009547918A patent/JPWO2009084245A1/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545505A (en) * | 2010-12-28 | 2012-07-04 | 三菱电机株式会社 | Induction motor, compressor and refrigerating cycle apparatus |
| CN102545505B (en) * | 2010-12-28 | 2015-09-30 | 三菱电机株式会社 | Induction motor, compressor and refrigerating circulatory device |
| CN107171481A (en) * | 2017-07-25 | 2017-09-15 | 濮阳市华南重工科技有限公司 | A kind of vibrohammer threephase asynchronous |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2009084245A1 (en) | 2009-07-09 |
| JPWO2009084245A1 (en) | 2011-05-12 |
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