CN201178400Y - Frequency conversion driving sewing machine and electric motor thereof - Google Patents
Frequency conversion driving sewing machine and electric motor thereof Download PDFInfo
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- CN201178400Y CN201178400Y CNU2008200439841U CN200820043984U CN201178400Y CN 201178400 Y CN201178400 Y CN 201178400Y CN U2008200439841 U CNU2008200439841 U CN U2008200439841U CN 200820043984 U CN200820043984 U CN 200820043984U CN 201178400 Y CN201178400 Y CN 201178400Y
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Abstract
A variable-frequency driven sewing machine comprises a structure, in which a power source from a grid is converted into a variable-frequency power source to drive a three-phase motor. The structure comprises a DC power source, a two-phase inverter circuit with the time lag of 1/6 period and the same amplitude of vibration and a three-phase motor, wherein, the two-phase inverter circuit is connected with an output terminal of the DC power source and is provided with two phase output terminals and a common terminal of two phase outputs; the three-phase motor is connected with an output terminal of the two-phase inverter circuit; two phase terminals of the motor are connected with two phase output terminals of the two-phase inverter circuit; a third phase terminal of the motor is connected with the common terminal of the two phase outputs of the two-phase inverter circuit; and the three-phase motor is provided with such three-phase impedance that the impedances of two phases of two output terminals connected with a two-phase power source are equal and larger than that of one phase connected to the common terminal. The impedances of two phases of two output terminals connected with the two-phase power source is 1.5 to 4.5 times of that of one phase connected to the common terminal. The design can improve the asymmetrical effect of a system, thereby improving efficiency and reducing vibration noise.
Description
Technical field
The present invention relates to a kind of sewing machine and motor thereof of frequency conversion drive, in International Patent Classification (IPC), functional classification can belong to H02P7/00.
Background technology
Three-phase inversion drives the threephase motor system and uses in a large number at industrial equipment, but is used for the sewing machine of the much smaller relatively single phase power supply frequency conversion drive of power, the inverter circuit on the high side and element volume underutilization of unit number that seems.Complicated circuit also becomes the weak link of system, need select more outstanding unit elements usually for use or complicated protective circuit and control program are set, so that use the higher Intelligent Power Module (IPM) of price and 16 single-chip microcomputers etc., obviously influences cost.For this reason, designer of the present invention proposes to drive with the two-phase inversion system of two-phase motor or threephase motor, is found in Chinese invention patent ZL00131018.6 and ZL01114863.2.Such system can save 1/3 control circuit, thereby cost significantly reduces and improve reliability.Wherein, what ZL01114863.2 disclosed is that the two-phase inversion drives three-phase symmetrical motor system, the theoretical proof that specification is introduced, in such system, identical and time lag equals the synthetic result of two-phase power supply in 1/6 cycle by having public output, fundamental frequency and an amplitude, fundamental voltage on public output (being labeled as " C ") and two phase output terminals (being labeled as " A " and " B "), order according to terminal is a three-phase symmetric voltage, can drive three-phase symmetrical motor symmetrical operation.But during the side circuit operation, be that sub-A of two-phase inverting output terminal and B are to the voltage U of public terminal C to the voltage effective value test result on three input terminals of motor
CAAnd U
CBAbout equally, but than the fundamental voltage U between two lead-out terminals
ABLittle; To the current effective value test result that enters three input terminals of motor be the output current I of two-phase inverting output terminal (controlled end) sub-A and B
AAnd I
BAbout equally, but than the electric current I of the sub-C of common port (uncontrolled end)
CThan big, promptly show and still owe symmetry, influential to efficient and vibration noise level.
Summary of the invention
Technical problem to be solved by this invention is, proposes a kind of design of improvement, makes the two-phase inversion in the sewing machine of frequency conversion drive drive threephase motor system symmetrical operation as far as possible.
The technical scheme of technical solution problem of the present invention is that a kind of sewing machine of frequency conversion drive comprises the power source conversion from electrical network is become variable frequency power supply, drives the structure of threephase motor; This structure comprises: DC power supply; The two-phase inverter circuit that 1/6 cycle of time lag is identical with amplitude is connected the output of described DC power supply, and has the common port of two phase output terminals and a two-phase output; Threephase motor, be connected the output of described two-phase inverter circuit: two phase terminals of motor connect two phase output terminals of described inverter circuit, and the 3rd phase terminal of motor connects the common port of the two-phase output of described inverter circuit; Described threephase motor has such three phase of impedance: the two-phase impedance that connects two lead-out terminals of two-phase power supply equates, and greater than the impedance of a phase that connects described common port.
Theoretical show with experiment: it is less that deliberately design is connected the impedance of a phase of described common port, can adapt to the lower situation of its connection phase power supply virtual voltage, with the increase electric current, thereby improves the symmetry of three-phase current effective value, raises the efficiency and reduce vibration noise.Promptly this design improvement is dexterously with a suitably asymmetric threephase motor of each phase of impedance, connects one based on two-phase inversion, theoretical symmetry and actual asymmetric three phase mains unexpectedly reaches the asymmetric effect of improvement system.
The modular design of described variable frequency power supply is: described DC power supply comprises: AC power; Current rectifying and wave filtering circuit is one group of positive half wave current rectifying and wave filtering circuit and one group of negative halfwave rectifier filter circuit, and its input is connected the output of described AC power, and its output and AC power have a common port; And described inverter circuit is two half-wave Unit 4, and per two unit are one group, two groups of common ports of respectively drawing a phase output terminal and a two-phase output.
Three phase of impedance of described threephase motor are preferably designed as: the two-phase impedance phase that connects two lead-out terminals of two-phase power supply is 1.5～4.5 times of the impedance of the phase that connects described common port.Its modular design is: its stator core stamping sheet is square and 4 jiaos of circumference profiles that circular arc is arranged, its stator slot number is 12 to multiply by a certain integer quotient, at 4 jiaos of arc sections of described iron core number being set respectively is that described coefficient multiply by 2 deep trouth, and 4 straightways respectively are provided with the shallow slot that number is described coefficient; Stator built-in line is three-phase 4 utmost points of star-like connection, and the end of three phase windings links together, and top connects one of described common port and is called the 1st phase mutually, is distributed in shallow slot; The two-phase that top connects two lead-out terminals of two-phase power supply be called the 2nd with the 3rd mutually, be distributed in deep trouth; Effective turn ratio of the 2nd and the 3rd phase winding is 1, the 1 to be 0.5 ± 0.25 with the 2nd mutually effective turn ratio.Square punching has the highest material to open the material utilance, and 4 utmost point motor windings pole spans are mechanical angle 90 degree, and the 1st phase of impedance is little, thereby uses less groove area, can be distributed in punching 4 straightways; In addition two phase of impedance are big, thereby use bigger groove area, can be distributed in 4 jiaos of arc sections of punching, and the result makes square punching obtain reasonable use, has improved the utilance of iron core, thereby has reduced cost.
Technical scheme of the present invention and effect will be further described in embodiment in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 is the electrical diagram of present embodiment frequency changing driving system;
Fig. 2 is embodiment of the invention motor stator punching figure;
Fig. 3 is that embodiment of the invention motor winding launches and winding diagram.
Embodiment
Embodiment of the invention frequency conversion drive sewing machine system mainly is made up of motor 7 and control device 10 as shown in Figure 1.
Current rectifying and wave filtering circuit 12 comprises: the current rectifying and wave filtering circuit of the positive supply of being made up of diode D1 and capacitor C1; The current rectifying and wave filtering circuit of the negative supply of forming by diode D2 and capacitor C2.The zero-potential point of the current rectifying and wave filtering circuit of two groups of power supplys links to each other with an output line (being generally the neutral line) of power supply 11.The double half-wave rectification filter circuit that this proposes for the embodiment of the invention.But be not limited to this, when needs are higher than the variable frequency power supply of line voltage, can use all-wave and/or voltage multiplying rectifier filter circuit.
u
CA＝U
msinωt；
Switch element V1b, V2b form the two half-wave inverter circuits of another group, form the voltage of common port C to lead-out terminal B
u
CB＝U
msin(ωt+π/3)。
As a result, lead-out terminal A and B and common port C export three-phase symmetric voltage according to the order of terminal:
u
AB＝U
msin(ωt+2π/3)；
u
BC＝U
msin(ωt-2π/3)；
u
CA＝U
msinωt。
About the mode of Frequency-variable Modulation, present embodiment is voltage-type pulse-width modulation (PWM, the SPWM etc.) mode of prior art, but also can be for current mode or/and modes such as pulse-ampli tude modulations; And, can also be to carry out voltage modulated when carrying out Frequency-variable Modulation for better speed adjusting performance is arranged.Present embodiment to the change of these prior aries that legacy system uses mainly is:
A) legacy system is a three-phase modulations, and present embodiment is a bi-phase modulated;
B) the alternate time lag of legacy system was modulated to for 1/3 cycle, and the alternate time lag of present embodiment was modulated to for 1/6 cycle.
Controlling organization 15 contains the PWM output mechanism, and constitutes in microcomputer, according to sewing machine service performance required intrinsic setting and the dynamically requirement of adjustment, except that the two-phase power supply of control inverter circuit 13 outputs, also controls its frequency, voltage and waveform.Inner can being provided with the periphery of microcomputer is present embodiment circuit protection, control and electromagnetic compatibility required peripheral circuit and element.In addition, microcomputer can comprise that also sewing machine carries out various sewing modes, to the processing of relevant sensing and controlled function; These all belong to the prior art that legacy system has used.
Motor 7 can be exactly the three-phase AC asynchronous motor that prior art has been used.But being not limited to this, also can be other threephase motor, reluctance motor for example, the permanent magnet synchronous motor in hysteresis motor and the inverse type brushless DC motor etc.
More than the more detailed visible Chinese invention patent specification of content CN1164824C.
The threephase motor rated output power 300W of embodiment of the invention frequency conversion drive sewing machine, rotating speed 1350r/m, its stator punching as shown in Figure 2, winding distribute and wiring as shown in Figure 3.The structure of this motor comprises:
---see Fig. 2, the square size B1=108mm of stator punching (holding the material situation can make the B1 design load have ± 1mm difference), 4 jiaos of arc diameter A1=114mm, inside diameter D 1=70mm; 24 groove round bottomed vessels, the facewidth such as parallel teeth are that symmetrical centre is uniform with the tooth, each 4 groove on 4 jiaos of arc sections are deep trouth Z2, the high hs11=9.5mm of waist; Each 2 groove of 4 straightways are shallow Z1, the high hs12=5.7mm of waist; The wide 9mm that is about of each several part yoke makes iron core obtain more abundant reasonable use, and rigidity might as well.High ho1 of notch and ho2 are 0.7mm, and slot opening bso1 and bso2 are 0.7mm, and groove shoulder slope angle zs1 and zs2 are 30 °, and last bottom width bs11 and bs12 are 24.5mm;
---core length 60mm;
---connect the lead-out wire A and the B of two lead-out terminals of inverter bridge, connect the lead-out wire C of inverter circuit common port;
---cage rotor and other mechanical mechanism.
---winding is that three-phase 4 utmost points, individual layer and pitch are 5 by Fig. 3 rule; The 1st mutually 4 coils series connection be distributed in the 4th and the 9th groove successively, the 15th and the 10th groove, the 16th and the 21st groove, the 3rd and the 22nd groove, totally 8 shallow slots, every groove conductor number average is 50; Draw from the 22nd groove at top, and end is drawn from the 4th groove; The 2nd mutually 4 coils series connection be distributed in the 24th and the 5th groove successively, the 23rd and the 18th groove, the 12nd and the 17th groove, the 11st and the 6th groove, totally 8 deep trouths, every groove conductor number average is 100, draw from the 6th groove at top, terminally draws from the 24th groove; The 3rd mutually 4 coils series connection be distributed in the 20th and the 1st groove successively, the 19th and the 14th groove, the 8th and the 13rd groove, the 7th and the 2nd groove, totally 8 deep trouths, every groove conductor number average is 200, draw from the 2nd groove at top, terminally draws from the 20th groove; The top of the 1st phase meets lead-out wire C, and the top of the 2nd phase meets lead-out wire A, and the top of the 3rd phase winding meets lead-out wire B, and the end of three phase windings links together.
Because the 1st phase winding conductor number has only the 2nd mutually or half of the 3rd phase, impedance has only the latter 1/4 approximately, and when its voltage only be under half the situation of the latter, electric current can increase and is twice, and makes the symmetry improvement.Because the voltage symmetry difference of different power and inversion modulation system is different, can adjust described impedance ratio according to theory analysis or experiment, promptly the 1st phase groove conductor number with the 2nd mutually or the ratio of the 3rd phase groove conductor number.
More than all according to Y-connection (claiming Y to connect again), can certainly be that triangle connects: the first and last end of three phase windings links to each other by phase sequence three phase windings of She Ji motor successively.Under same power supplies voltage, the phase voltage that triangle connects is 1.76 times of Y-connections in theory, and each phase winding need be by star-triangle impedance transformation formula conversion, and every groove conductor number is roughly 1.76 times of Y-connections, and the line cross section is corresponding to be reduced into 1/1.76.
In addition, it is 12 grooves, 36 grooves or 48 grooves etc. that stator also can be looked the corresponding fluting of power or iron core size, and according to the class ratio method of conventional motor electromagnetic design, the distribution of the above-mentioned winding conductor of corresponding modify and data.
Claims (7)
1, a kind of sewing machine of frequency conversion drive comprises the power source conversion from electrical network is become variable frequency power supply, drives the structure of threephase motor; This structure comprises: DC power supply (13); The two-phase inverter circuit (14) that 1/6 cycle of time lag is identical with amplitude is connected the output of described DC power supply (13), and have two phase output terminals (A, B) and the common port (C) of two-phase output; Threephase motor (7), be connected the output of described two-phase inverter circuit (14): two phase terminals of motor (7) connect (14) two phase output terminal (A of described inverter circuit, B), the 3rd of motor (7) the phase terminal connects the common port (C) of the two-phase output of described inverter circuit (14); It is characterized in that described threephase motor has such three phase of impedance: the impedance of two-phase that connects two lead-out terminals of two-phase power supply equates, and greater than the impedance of a phase that connects described common port.
According to the sewing machine of the described frequency conversion drive of claim 1, it is characterized in that 2, described DC power supply (13) comprising: AC power (11); Current rectifying and wave filtering circuit (12) is one group of positive half wave current rectifying and wave filtering circuit and one group of negative halfwave rectifier filter circuit, and its input is connected the output of described AC power (11), and its output and AC power (11) have a common port (C); And described inverter circuit (14) is two half-wave Unit 4, and per two unit are one group, two groups respectively draw a phase output terminal (A, B) and the common port (C) of a two-phase output.
3, the threephase motor in a kind of sewing machine of frequency conversion drive according to claim 1 is characterized in that: the impedance of two-phase that this motor connects two lead-out terminals of two-phase power supply is 1.5～4.5 times of the impedance of the phase that connects common port.
4, according to the described threephase motor of claim 3, it is characterized in that: its stator core stamping sheet is square and 4 jiaos of circumference profiles that circular arc is arranged, its stator slot number is 12 to multiply by a certain integer quotient, at 4 jiaos of arc sections of described iron core number being set respectively is that described coefficient multiply by 2 deep trouth (Z2), and 4 straightways respectively are provided with the shallow slot (Z1) that number is described coefficient; Stator built-in line is three-phase 4 utmost points of star-like connection, and the end of three phase windings links together, and top connects one of described common port and is called the 1st phase mutually, is distributed in shallow slot (Z1); The two-phase that top connects two lead-out terminals of two-phase power supply be called the 2nd with the 3rd mutually, be distributed in deep trouth (Z2); The turn ratio of the 2nd and the 3rd phase winding is 1, the 1 to be 0.5 ± 0.25 with the 2nd mutually effective turn ratio.
5, according to the described threephase motor of claim 4, it is characterized in that: its rated output power 40～250W, rated slip 0.12 ± 0.03; Stator iron-core lamination is square size 108 ± 1mm and 4 jiaos of circumference profiles that circular arc is arranged, and 24 grooves are that the facewidth such as symmetrical centre are uniform with the tooth, at described 4 jiaos of arc sections 4 deep trouths (Z2) are set respectively, and 4 straightways respectively are provided with 2 shallow slots (Z1); Stator built-in line is three-phase 4 utmost points, individual layer, and pitch is 5, the 1 to be 0.4 ± 0.15 with the 2nd mutually effective turn ratio.
6, according to the described threephase motor of claim 5, it is characterized in that: the beeline of the bottom land of described shallow slot and deep trouth and punching outer about equally.
7, according to the described threephase motor of claim 6, it is characterized in that: described stator iron-core lamination internal diameter 70mm; Described shallow slot and deep trouth are round bottomed vessel, and ((bso1 bso2) is 0.7mm to slot opening to the notch height, groove shoulder slope angle (zs1, zs2) 30 °, last bottom width (bs11, bs12) 4.5mm for ho1, ho2) 0.7mm; Shallow slot bottom width (bs22) 5.8mm, waist height (hs12) 5.7mm; Deep trouth bottom width (bs21) 6.8mm, waist height (hs12) 9.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200439841U CN201178400Y (en) | 2008-02-15 | 2008-02-15 | Frequency conversion driving sewing machine and electric motor thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200439841U CN201178400Y (en) | 2008-02-15 | 2008-02-15 | Frequency conversion driving sewing machine and electric motor thereof |
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| Publication Number | Publication Date |
|---|---|
| CN201178400Y true CN201178400Y (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200439841U Expired - Fee Related CN201178400Y (en) | 2008-02-15 | 2008-02-15 | Frequency conversion driving sewing machine and electric motor thereof |
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| Country | Link |
|---|---|
| CN (1) | CN201178400Y (en) |
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2008
- 2008-02-15 CN CNU2008200439841U patent/CN201178400Y/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
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Granted publication date: 20090107 Termination date: 20110215 |