CN1164824C - Frequency changing triphase driven washing machine - Google Patents
Frequency changing triphase driven washing machine Download PDFInfo
- Publication number
- CN1164824C CN1164824C CNB011148632A CN01114863A CN1164824C CN 1164824 C CN1164824 C CN 1164824C CN B011148632 A CNB011148632 A CN B011148632A CN 01114863 A CN01114863 A CN 01114863A CN 1164824 C CN1164824 C CN 1164824C
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- CN
- China
- Prior art keywords
- phase
- power supply
- washing machine
- motor
- circuit
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- Expired - Lifetime
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- 238000005406 washing Methods 0.000 title claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008520 organization Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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Abstract
The present invention relates to a variable frequency three-phase driven washing machine. In the present invention, a network power supply is converted into a variable frequency power supply to drive a three-phase motor. The present invention is characterized in that the variable frequency power supply is a two-phase power supply which has a common port and has the time lag of 1/6 cycle and identical amplitude. The common port is connected to a phase terminal of the motor; two output terminals of the two-phase power supply are connected to the other two phase terminals of the motor. The present invention has a scheme that a rectification filtering circuit of the variable frequency power supply is a half-wave rectification filtering circuit which has a common port with a loop of the network power supply and has a set of positive electrodes and a set of negative electrodes. An inversion circuit is a double half-wave 4 unit. 1/3 of an inversion unit and a control circuit can be saved as compared with the traditional technology, and the reliability can be improved.
Description
The present invention relates to a kind of washing machine (the following abbreviation " washing machine ") of frequency conversion three-phase drive.
In this washing machine, be converted into variable-frequency power sources from the power supply of electrical network, drive threephase motor.Frequency conversion drive is the preferable electric motor speed adjusting method of quality.For improving performance, in recent years, washing machine is developed to the frequency conversion drive threephase motor by the single-phase motor of fixed frequency driving in the past, and uses the typical technology of widely used frequency-variable electronic three phase mains on industrial equipment.As seen by disclosed " patent of invention prospectus (application number: 98123091 in China Intellectual Property Office's on September 8th, 1999; Denomination of invention: electrical washing machine) ".The inverter circuit that it is characterized in that the frequency-variable electronic three-phase power supply system is bridge-type Unit 6.This former legacy system that is used for industrial equipment is used for the much smaller relatively washing machine of power, promptly has following aspect to be worth improving:
1. the unit number of inverter circuit is on the high side, and cell capability is not fully utilized when bigger than normal relatively, influences cost and reliability; In addition, to the control of inverter circuit also relative complex, influence cost and reliability equally.
2. in bridge inverter main circuit, two units in series cross-over connections up and down of each brachium pontis are in dc source, when accidental interference or false triggering so that during conducting simultaneously, i.e. low-impedance path at two unit forms the shoot through of big electric current, so that burn element, be the weak link of system.Usually need select for use more outstanding unit elements, or complicated holding circuit is set,,, obviously influence cost for washing machine so that use the higher SPM (IPM) of price etc. to this.
Task of the present invention is, at the little characteristics of washing machine power, proposes a kind of washing machine of frequency conversion three-phase drive, and its variable-frequency power sources can similarly drive original threephase motor compared with the prior art, but designs simplification, thereby cost reduces and the reliability raising.Comprise:
1. reduce the unit number of inverter circuit;
2. can eliminate the short circuit Low ESR of inverter circuit cross-over connection in dc source.
For solving above-mentioned task, the present invention proposes a kind of step washing machine of three-phase drive frequently that becomes, and in this washing machine, is converted into variable-frequency power sources from the power supply of electrical network, drives threephase motor; It is characterized in that: the variable-frequency power sources that is converted to is to have common port, a time lag to equal the 1/6 cycle two-phase power supply identical with amplitude; Described two-phase power supply is pressed and stated the three-phase terminal that is access to threephase motor: a phase terminal of described public termination motor, other two lead-out terminals of described two-phase power supply connect two phase terminals in addition of motor.
Described variable-frequency power sources can be converted through current rectifying and wave filtering circuit and inverter circuit, current rectifying and wave filtering circuit is made up of one group of positive half-wave current rectifying and wave filtering circuit and one group of negative halfwave rectifier filter circuit of a common port with the electric power loop from electrical network, forms positive and negative each one group of dc source of supplying with inverter circuit; Inverter circuit is two half-wave Unit 4, and per two unit are one group, dc source be modulated to frequency conversion, have common port, a time lag to equal the 1/6 cycle two-phase power supply identical with amplitude.
About having common port, a time lag to equal the 1/6 cycle two-phase power supply identical with amplitude, its common port (being labeled as " C " in the following analysis) is to the voltage u of two lead-out terminals (respectively being labeled as " A " and " B " in the following analysis)
CAAnd u
CBFirst-harmonic can be expressed as:
u
CA＝U
msinωt
u
CB=U
mVoltage u between two lead-out terminals of sin (ω t+ π/3)
ABPress following calculating:
u
AB＝u
CB-u
CA
＝U
msin(ωt+π/3)-U
msinωt
=U
mSin (ω t+2 π/3) in addition, u
BCBe u
CBOppositely, that is: u
BC=-u
CB
＝-U
msin(ωt+π/3)
=U
mSin (ω t-2 π/3) therefore, the voltage that two lead-out terminal A of described two-phase power supply and B and common port C are exported according to the order of terminal is:
u
AB＝U
msin(ωt+2π/3)
u
BC＝U
msin(ωt-2π/3)
u
CA=U
mSin ω t is obvious, this is a three-phase symmetric voltage, can drive the original threephase motor of washing machine, but the three-phase inversion of legacy system is reduced to the two-phase inversion, the element of the unit number of inverter circuit and control inverter circuit can reduce 1/3, thereby cost reduces and reliability improves.For the variable-frequency power sources of microcomputer control, also corresponding minimizing can improve control rate to the requirement of capacity, amount of calculation and the control of program internal memory, helps improving performance and reduces cost.
About the variable-frequency power sources in the such scheme, a solution of the present invention is that variable-frequency power sources is converted through current rectifying and wave filtering circuit and inverter circuit from the power supply of electrical network.Current rectifying and wave filtering circuit is made up of one group of positive half-wave current rectifying and wave filtering circuit and one group of negative halfwave rectifier filter circuit of a common port with the electric power loop from electrical network, forms each one group of dc source of positive and negative of supplying with inverter circuit; Inverter circuit is two half-wave Unit 4, and per two unit are one group, dc source be modulated to frequency conversion, have common port, a time lag to equal the 1/6 cycle two-phase power supply identical with amplitude.The rectifier cell number of this scheme reduces 1/2nd than the legacy system bridge rectifier; Unit number in the inverter circuit is reduced to 4 from 6 of legacy system; Because each unit of inverter circuit is through motor inductance series connection power supply, can avoid big short circuit current that false triggering causes so that burn element, improve reliability, thereby can simplify holding circuit and select more common element for use.
Below in conjunction with the description of drawings embodiments of the invention.
Fig. 1 is the electrical diagram of present embodiment frequency changing driving system;
Fig. 2 is system's pie graph of present embodiment washing machine.
As shown in Figure 2, steel ladle 1 rotation is provided with the washtub that is provided with impeller 2 freely in the inner bottom part rotation dehydration barrel 3 of holding concurrently freely, hangs in body of the washing machine 5 by suspender 4.Reducing gear 6 is located at the bottom of steel ladle 1, transmission of power to impeller 2 and the washtub dehydration barrel 3 of holding concurrently.The bottom of reducing gear 6 is provided with motor 7.Water system 8 supplies water in washtub is held concurrently dehydration barrel 3, and draining valve system 9 is the discharges such as washings in the washing and dewatering bucket 3.This is a kind of typical case's formation of pulsator washing machine.But do not limit is pulsator washing machine, also can be agitator type washing machine or tumbling-box washing machine.Also be not limited in addition need reducing gear or/and the structure of the same through-drive of diagram motor and each rotary body, for example can adopt by belt the transmission of power of motor 7 to the structure of reducing gear 6, in washing process, power is directly delivered to the direct drives structure of impeller or/and do not establish reducing gear 6.
The control device 10 of motor 7 comprises: by from the AC power 11 of for example 220V50HZ of electrical network be connected in its output and AC power 11 rectifications be transformed into the dc source 13 that the current rectifying and wave filtering circuit 12 of DC voltage is constituted; The inverter circuit 14 that connects at the output of dc source.Output at inverter circuit 14 is connecting motor 7.In addition, inverter circuit 14 connects controlling organization 15, and controlled by it.This is the control device of typical A C-DC-AC indirect conversion mode, but is not limited thereto, and also can be the control device of not establishing the AC-AC Direct Transform mode of current rectifying and wave filtering circuit.
Fig. 1 represents the circuit diagram of motor 7 and control device 10 in the embodiment of the invention.In the present embodiment, 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 conductor) 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 sources of line voltage, can use all-wave and/or voltage multiplying rectifier filter circuit.
u
CA=U
mSin ω t; 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 are according to the order output three-phase symmetric voltage 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 pulsewidth modulation (PWM, the SPWM etc.) mode of prior art, but also can be for current mode or/and modes such as pulse-amplitude 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 washing 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 also that the washing machine of present embodiment washs, rinsing and dehydration supervisor and processing to relevant sensing and control function.These all belong to the prior art that legacy system has used.
Like this, the present invention has just reached the use converter technique and has improved washing machine, but simplifies the structure of prior art traditional frequency conversion system, thereby reduces cost and improve the purpose of reliability.
Claims (2)
1. the washing machine of a frequency conversion three-phase drive in this washing machine, is converted into variable-frequency power sources from the power supply of electrical network, drives threephase motor; It is characterized in that: the variable-frequency power sources that is converted to is to have common port, a time lag to equal the 1/6 cycle two-phase power supply identical with amplitude; Described two-phase power supply is pressed and is stated the three-phase terminal that is access to threephase motor---and a phase terminal of described public termination motor, two lead-out terminals of described two-phase power supply connect two phase terminals in addition of motor.
2. according to the washing machine of the described frequency conversion three-phase drive of claim 1, it is characterized in that: described variable-frequency power sources is converted through current rectifying and wave filtering circuit and inverter circuit, current rectifying and wave filtering circuit is made up of one group of positive half-wave current rectifying and wave filtering circuit and one group of negative halfwave rectifier filter circuit of a common port with the electric power loop from electrical network, forms positive and negative each one group of dc source of supplying with inverter circuit; Inverter circuit is two half-wave Unit 4, and per two unit are one group, dc source be modulated to frequency conversion, have common port, a time lag to equal the 1/6 cycle two-phase power supply identical with amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011148632A CN1164824C (en) | 2001-06-27 | 2001-06-27 | Frequency changing triphase driven washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011148632A CN1164824C (en) | 2001-06-27 | 2001-06-27 | Frequency changing triphase driven washing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1332287A CN1332287A (en) | 2002-01-23 |
| CN1164824C true CN1164824C (en) | 2004-09-01 |
Family
ID=4661471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011148632A Expired - Lifetime CN1164824C (en) | 2001-06-27 | 2001-06-27 | Frequency changing triphase driven washing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1164824C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100440721C (en) * | 2005-12-20 | 2008-12-03 | 江门市洗衣机厂 | Frequency changing AC speed changing driving washing machine |
| CN101510751B (en) * | 2008-02-15 | 2012-08-22 | 江门金羚电机有限公司 | Variable frequency drive system and motor thereof |
-
2001
- 2001-06-27 CN CNB011148632A patent/CN1164824C/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| CN1332287A (en) | 2002-01-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WASHER FACTORY, JIANGMEN CITY Free format text: FORMER OWNER: JINLING ELECTRIC EQUIPMENT CO., LTD. Effective date: 20060217 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20060217 Address after: 529040 Guangdong city of Jiangmen province Jiang Cui Road No. 162 Jiangmen City washing machine factory Patentee after: Jiangmen Washing Machine Factory Address before: 529040 Guangdong Province, Jiangmen Jianghai River Hill Road No. 162 Patentee before: JIN LING ELECTRICAL Co.,Ltd. |
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| ASS | Succession or assignment of patent right |
Owner name: JINLING ELECTRIC EQUIPMENT CO., LTD. Free format text: FORMER OWNER: WASHER FACTORY, JIANGMEN CITY Effective date: 20060630 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20060630 Address after: 529040 Guangdong Province, Jiangmen Jianghai River Hill Road No. 162 Patentee after: JIN LING ELECTRICAL Co.,Ltd. Address before: 529040 Guangdong city of Jiangmen province Jiang Cui Road No. 162 Jiangmen City washing machine factory Patentee before: Jiangmen Washing Machine Factory |
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| CX01 | Expiry of patent term |
Granted publication date: 20040901 |
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| CX01 | Expiry of patent term | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: District Chief Thorium Document name: Notice of expiration and termination of patent right |