CN102298087A - Method for measuring voltage of power grid according to revolving speed of direct-current motor of air pipe type air-conditioning indoor unit - Google Patents
Method for measuring voltage of power grid according to revolving speed of direct-current motor of air pipe type air-conditioning indoor unit Download PDFInfo
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- CN102298087A CN102298087A CN2011102595041A CN201110259504A CN102298087A CN 102298087 A CN102298087 A CN 102298087A CN 2011102595041 A CN2011102595041 A CN 2011102595041A CN 201110259504 A CN201110259504 A CN 201110259504A CN 102298087 A CN102298087 A CN 102298087A
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Abstract
The invention relates to an air-conditioning system, in particular to a method for measuring voltage of a power grid according to the revolving speed of a direct-current motor of an air pipe type air-conditioning indoor unit. According to the method for measuring the voltage of the power grid according to the revolving speed of the direct-current motor of the air pipe type air-conditioning indoor unit, the state of the current voltage of the power grid is judged through the corresponding relationship between the actually measured revolving speed of the motor and the voltage of the power grid, and pre-intervening control is implemented, so that the motor works in an accurate state. A sampling circuit does not need to be designed when the voltage of the power grid is estimated in an air-conditioner, so that a series of problems in circuit design due to the voltage sampling circuit are avoided, the cost is reduced, and the stability and the operating efficiency of the system are improved.
Description
Technical field
The present invention relates to a kind of air-conditioning system, specifically, relate to a kind of method of measuring line voltage according to the air duct type air conditioning indoor machine dc motor speed.
Background technology
The wind pipe type indoor set needs to consider the actual conditions of line voltage when the driving circuit of design fan electromotor.Therefore, in circuit design, need to add the line voltage sample circuit DC bus-bar voltage Vdc that samples and obtain line voltage effective value Vs (Vdc=Vs*
), as shown in figure one.This measure has improved circuit cost, and can bring a series of problems such as heating, stand-by power consumption exceed standard, strong and weak electricity can't be separated.
Summary of the invention
The present invention overcomes above-mentioned defective, provide a kind of by corresponding relation between the motor speed of surveying out and line voltage, judge the state of current line voltage, implement pre-the interference and control, thereby make machine operation in method according to air duct type air conditioning indoor machine dc motor speed measurement line voltage at correct state.
The technical scheme of measuring the method for line voltage according to the air duct type air conditioning indoor machine dc motor speed of the present invention is such: it comprises the following steps:
A: start;
B: at first utilize laboratory instrument, the control voltage of model machine is set in setting value VSP, rotating speed of motor value and current line voltage are set up a database during measure motor counter-rotating operation back then the 2nd second and the 3rd second after gathering;
The counter-rotating of C:CPU control motor was measured rotating speed of motor at the 2nd second, the 3rd second respectively, and is calculated the difference △ value between two values, repeated three times, obtained 3 value: △ 1, △ 2, △ 3;
D: 3 △ values that will obtain and the numerical value in the database compare, if 3 pairing line voltages of △ value are same value V0, then this voltage V0 is current line voltage; If among these 3 rotating speed difference △ 2 pairing line voltages being arranged is same value, be assumed to V1, and the line voltage V2 of another rotating speed difference correspondence and the difference between the V1 are no more than set amount, current voltage is V1, if the difference between V2 and the V1 surpasses set amount, then motor stops counter-rotating, stops repeating at least one minute to measure; If each is different for 3 pairing line voltages of rotating speed difference △ value, then make motor stop counter-rotating, remeasure again after at least one minute
Set amount is set to 3-6V.
Set amount is set to 5V.
Used after this control method, just needn't design sample circuit again when estimating line voltage in the air-conditioning, avoided in circuit design having reduced cost, and improved the stability and the operational efficiency of system because of adding a series of problems that voltage sampling circuit brings.
Description of drawings
Fig. 1 is an electrical block diagram of measuring the method for line voltage according to the air duct type air conditioning indoor machine dc motor speed of the present invention;
Fig. 2 is the tabulation of the database of embodiments of the invention 1;
Fig. 3 is the flow diagram of embodiments of the invention 1.
Embodiment
Embodiment 1:
Database is set up in start, and control allows motor reverse, the motor speed value that records when motor reverses 2s for the first time is 840/rpm, and the motor speed value that records during 3s is 932/rpm, and this moment, motor speed difference △ was 92/rpm, by table one as can be known, this moment, corresponding line voltage was 218V;
The motor speed value that motor records when reversing 2s for the second time is 842/rpm, and the motor speed value that records during 3s is 933/rpm, and this moment, motor speed difference △ was 91/rpm, and by table one as can be known, this moment, corresponding line voltage was 218V;
The motor speed value that motor records when reversing 2s for the third time is 939/rpm, and the motor speed value that records during 3s is 1030/rpm, and this moment, motor speed difference △ was 91/rpm, and by table one as can be known, this moment, corresponding line voltage was 218V.
At this moment, can determine that current line voltage value is 218V.
Embodiment 2:
Database is set up in start, and control allows motor reverse, the motor speed value that records during 2s when motor reverses for the first time is 840/rpm, and the motor speed value that records during 3s is 932/rpm, and this moment, motor speed difference △ was 92/rpm, by table one as can be known, this moment, corresponding line voltage was 218V;
The motor speed value that motor records when reversing 2s for the second time is 842/rpm, and the motor speed value that records during 3s is 927/rpm, and this moment, motor speed difference △ was 86/rpm, and by table one as can be known, this moment, corresponding line voltage was 213V;
The motor speed value that motor records when reversing 2s for the third time is 939/rpm, and the motor speed value that records during 3s is 1030/rpm, and this moment, motor speed difference △ was 91/rpm, and by table one as can be known, this moment, corresponding line voltage was 218V.
By the contrast of above-mentioned data as can be known, the line voltage with for the third time rotating speed difference correspondence is the same for the first time, and secondary 5V that differs is so current line voltage is 218V.
Embodiment 3:
Database is set up in start, and control allows motor reverse, the motor speed value that records during 2s when motor reverses for the first time is 840/rpm, and the motor speed value that records during 3s is 932/rpm, and this moment, motor speed difference △ was 92/rpm, by table one as can be known, this moment, corresponding line voltage was 218V;
The motor speed value that motor records when reversing 2s for the second time is 842/rpm, and the motor speed value that records during 3s is 924/rpm, and this moment, motor speed difference △ was 83/rpm, and by table one as can be known, this moment, corresponding line voltage was 208V;
The motor speed value that motor records when reversing 2s for the third time is 939/rpm, and the motor speed value that records during 3s is 1030/rpm, and this moment, motor speed difference △ was 91/rpm, and by table one as can be known, this moment, corresponding line voltage was 218V.
By the contrast of above-mentioned data as can be known, be the same with for the third time rotating speed difference for the first time, secondary 10V that differs; so this measurement must make motor shut down, after one minute, start again; measure once more, up to till embodiment 1 or embodiment 2 reach identical effect.
Embodiment 4:
Database is set up in start, and control allows motor reverse, the motor speed value that records during 2s when motor reverses for the first time is 840/rpm, and the motor speed value that records during 3s is 932/rpm, and this moment, motor speed difference △ was 92/rpm, by table one as can be known, this moment, corresponding line voltage was 218V;
The motor speed value that motor records when reversing 2s for the second time is 842/rpm, and the motor speed value that records during 3s is 924/rpm, and this moment, motor speed difference △ was 83/rpm, and by table one as can be known, this moment, corresponding line voltage was 208V;
The motor speed value that motor records when reversing 2s for the third time is 939/rpm, and the motor speed value that records during 3s is 1032/rpm, and this moment, motor speed difference △ was 93/rpm, and by table one as can be known, this moment, corresponding line voltage was 223V.
By the contrast of above-mentioned data as can be known, the difference of measuring for 3 times is all different, so this measurement must make motor shut down, after one minute, start is measured once more again, up to till embodiment 1 or embodiment 2 reach identical effect.
Claims (3)
1. the method according to air duct type air conditioning indoor machine dc motor speed measurement line voltage is characterized in that it comprises the following steps:
A: start;
B: at first utilize laboratory instrument, the control voltage of model machine is set in setting value VSP, rotating speed of motor value and current line voltage are set up a database during measure motor counter-rotating operation back then the 2nd second and the 3rd second after gathering;
The counter-rotating of C:CPU control motor was measured rotating speed of motor at the 2nd second, the 3rd second respectively, and is calculated the difference △ value between two values, repeated three times, obtained 3 value: △ 1, △ 2, △ 3;
D: 3 △ values that will obtain and the numerical value in the database compare, if 3 pairing line voltages of △ value are same value V0, then this voltage V0 is current line voltage; If among these 3 rotating speed difference △ 2 pairing line voltages being arranged is same value, be assumed to V1, and the line voltage V2 of another rotating speed difference correspondence and the difference between the V1 are no more than set amount, current voltage is V1, if the difference between V2 and the V1 surpasses set amount, then motor stops counter-rotating, stops repeating at least one minute to measure; If each is different for 3 pairing line voltages of rotating speed difference △ value, then make motor stop counter-rotating, remeasure again after at least one minute.
2. the method according to air duct type air conditioning indoor machine dc motor speed measurement line voltage according to claim 2 is characterized in that set amount is set to 3-6V.
3. the method according to air duct type air conditioning indoor machine dc motor speed measurement line voltage according to claim 2 is characterized in that set amount is set to 5V.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110259504 CN102298087B (en) | 2011-09-05 | 2011-09-05 | Method for measuring voltage of power grid according to revolving speed of direct-current motor of air pipe type air-conditioning indoor unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110259504 CN102298087B (en) | 2011-09-05 | 2011-09-05 | Method for measuring voltage of power grid according to revolving speed of direct-current motor of air pipe type air-conditioning indoor unit |
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| Publication Number | Publication Date |
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| CN102298087A true CN102298087A (en) | 2011-12-28 |
| CN102298087B CN102298087B (en) | 2013-04-03 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10281540A (en) * | 1997-03-31 | 1998-10-23 | Fujitsu General Ltd | Method for controlling air conditioner |
| CN1282999A (en) * | 1999-07-28 | 2001-02-07 | 三星电子株式会社 | Control device and control method of rotating speed of air conditioner fan motor |
| CN2454988Y (en) * | 2000-11-06 | 2001-10-17 | 建准电机工业股份有限公司 | Reference voltage rotational-speed-controlling fan motor |
| JP2005185071A (en) * | 2003-12-24 | 2005-07-07 | Aichi Electric Co Ltd | Rotational speed controller of single-phase induction motor |
| CN101603718A (en) * | 2009-07-23 | 2009-12-16 | 青岛海信日立空调系统有限公司 | A kind of automatic identifying method of static pressure of air duct type air conditioning indoor machine and system thereof |
-
2011
- 2011-09-05 CN CN 201110259504 patent/CN102298087B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10281540A (en) * | 1997-03-31 | 1998-10-23 | Fujitsu General Ltd | Method for controlling air conditioner |
| CN1282999A (en) * | 1999-07-28 | 2001-02-07 | 三星电子株式会社 | Control device and control method of rotating speed of air conditioner fan motor |
| CN2454988Y (en) * | 2000-11-06 | 2001-10-17 | 建准电机工业股份有限公司 | Reference voltage rotational-speed-controlling fan motor |
| JP2005185071A (en) * | 2003-12-24 | 2005-07-07 | Aichi Electric Co Ltd | Rotational speed controller of single-phase induction motor |
| CN101603718A (en) * | 2009-07-23 | 2009-12-16 | 青岛海信日立空调系统有限公司 | A kind of automatic identifying method of static pressure of air duct type air conditioning indoor machine and system thereof |
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| CN102298087B (en) | 2013-04-03 |
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