CN111464093A - Sampling method of air conditioner permanent magnet synchronous motor - Google Patents
Sampling method of air conditioner permanent magnet synchronous motor Download PDFInfo
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- CN111464093A CN111464093A CN202010282322.5A CN202010282322A CN111464093A CN 111464093 A CN111464093 A CN 111464093A CN 202010282322 A CN202010282322 A CN 202010282322A CN 111464093 A CN111464093 A CN 111464093A
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- 238000005070 sampling Methods 0.000 title claims abstract description 149
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000009466 transformation Effects 0.000 claims description 8
- 239000013598 vector Substances 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
Abstract
The invention discloses a sampling method of an air conditioner permanent magnet synchronous motor, which comprises the following steps: a. respectively configuring current sampling and system sampling to a sampling channel of an ADC module according to the real-time requirement of sampling data; b. according to the running data of the system time base, the sampling time CT1 and CT2 of the current sampling channel are configured; c. opening a current sampling channel, finishing current sampling at the moments of CT1 and CT2, closing the current sampling channel, and opening a system sampling channel; d. completing system sampling, and closing a system sampling channel; e. and c, transmitting the current data and the system data obtained by sampling to an FOC motor control operation unit and a system control function module, and circulating the steps c-e. The sampling method implemented by the invention can complete the control of the solar variable-frequency air conditioner on a low-cost chip, and can ensure the requirement of system operation on the voltage utilization rate while reducing the cost.
Description
Technical Field
The invention relates to the field of control of air conditioner permanent magnet synchronous motors, in particular to a sampling method of an air conditioner permanent magnet synchronous motor.
Background
With the continuous development of the control technology of the permanent magnet synchronous motor, the application of the permanent magnet synchronous motor is more and more extensive, so that the products of the permanent magnet synchronous motor also gradually enter thousands of households. Along with the gradual popularization of permanent magnet synchronous motor products, the requirements of people on the reliability and the comfort of products applied to the permanent magnet synchronous motor are higher and higher, such as the energy consumption and the cost of a variable frequency air conditioner. Therefore, in designing and manufacturing a permanent magnet synchronous motor product, reducing the cost is increasingly important to the system solution.
In the design and manufacturing process of the air conditioner permanent magnet synchronous motor, the existing sampling of the air conditioner permanent magnet synchronous motor is mainly completed through a control chip of the high-cost variable frequency air conditioner, which is obviously not beneficial to reducing the cost of the whole air conditioner.
Therefore, there is a need to provide an improved sampling method for a permanent magnet synchronous motor of an air conditioner, so as to reduce the cost of the inverter air conditioner and improve the execution efficiency of a chip.
Disclosure of Invention
The invention aims to provide a sampling method of an air conditioner permanent magnet synchronous motor, which can control a solar variable frequency air conditioner on a low-cost chip, reduce the cost and ensure the requirement of system operation on the voltage utilization rate.
In order to achieve the purpose, the invention provides a sampling method of an air conditioner permanent magnet synchronous motor, which comprises the following steps:
a. respectively configuring current sampling and system sampling to a sampling channel of an ADC module according to the real-time requirement of sampling data;
b. according to the running data of the system time base, the sampling time CT1 and CT2 of the current sampling channel are configured;
c. opening a current sampling channel, finishing current sampling at the moments of CT1 and CT2, closing the current sampling channel, and opening a system sampling channel;
d. completing system sampling, closing a system sampling channel, and opening a current sampling channel;
e. and c, transmitting the current data and the system data obtained by sampling to an FOC motor control operation unit and a system control function module, and circulating the steps c-e.
Preferably, the system samples comprise a maximum of 15 samples of the system parameters.
Preferably, the system sampling includes sampling of 6 parameters, bus voltage, outdoor environmental conditions, compressor coil dimensions, compressor discharge temperature, PFC current, and PFC ac voltage.
Preferably, the sampling time of the current sampling channel is set according to the system running time base, and the sampling time of the system sampling channel is fixedly set to be 0 point of the counting time base.
Preferably, the time base of the current sampling channel is the same as the time base of the combination of the high and low levels of the 6-way PWM output, and the sampling time of the current sampling channel corresponds to the valid vector time T1 and T2 matched by the 6-way PWM.
Preferably, the current sampling specifically refers to a phase current value of the operation of the permanent magnet synchronous motor obtained through a differential circuit of the sampling resistor and the operational amplifier.
Preferably, in the step e, the obtained data is determined, and if the obtained data is different from the set parameter threshold, a fault is reported, and a fault operation code is given.
Preferably, in the step e, the phase currents of the pmps sampled at the sampling times CT1 and CT2 are transmitted to a Clarke transformation module of the motor control algorithm unit FOC to generate input data required by the Park transformation module.
Preferably, the sampled voltage data of the direct current bus is transmitted to a motor control FOC module, the PFC current and the PFC alternating current voltage are transmitted to a PFC control module together, and the sampled outdoor environment condition, the compressor coil pipe dimension and the compressor exhaust temperature are transmitted to a system operation module of the variable frequency air conditioner.
Preferably, in step d, the system sampling channel is closed, and the current sampling channel is opened, both being controlled by the control register sar ADC _ REG of the ADC module.
Compared with the prior art, the sampling method of the air conditioner permanent magnet synchronous motor adopts a time-sharing multiplexing sampling technology, eliminates the bottleneck problem that the sampling speed of a low-cost chip ADC module is low and occupies too much resources, not only ensures the problem of voltage utilization rate, but also greatly reduces the cost of an MCU; in addition, the sampling method of the permanent magnet synchronous motor of the air conditioner can be compatible with a high-cost chip, so that the universality of various MCU implementations is enhanced; moreover, the sampling method of the permanent magnet synchronous motor of the air conditioner can reduce the cost of the MCU by 50 percent. The purpose of really solving the MCU cost for the variable frequency air conditioner from the technical perspective promotes the problem of voltage utilization rate in the low-cost MCU realization process.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.
Drawings
Fig. 1 is a flowchart of a sampling method of an air conditioner permanent magnet synchronous motor according to the present invention.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements. According to the sampling method implemented by the invention, the control of the solar variable-frequency air conditioner can be completed on a low-cost chip, and the requirement of system operation on the voltage utilization rate can be ensured while the cost is reduced.
Referring to fig. 1, fig. 1 is a flowchart illustrating a sampling method of a permanent magnet synchronous motor of an air conditioner according to the present invention. As shown in the figure, the sampling method of the air conditioner permanent magnet synchronous motor comprises the following steps:
step S101, respectively configuring current sampling and system sampling to a sampling channel of an ADC module according to the real-time requirement of sampling data; in this step, the current sampling and the system sampling are configured to the sampling channel of the ADC module, so that the channel of the ADC module can be multiplexed in a time-sharing manner, thereby reducing chip resource occupation and achieving the purpose of sampling data signals by a high-cost chip. In addition, the current sampling specifically refers to a phase current value of the operation of the permanent magnet synchronous motor obtained through a differential circuit of the sampling resistor and the operational amplifier. The system sampling comprises sampling 6 parameters, namely sampling bus voltage, outdoor environment condition, compressor coil dimensionality, compressor exhaust temperature, PFC current and PFC alternating current voltage, and certainly, in practical application, the sampling parameters can be set to be more, but the sampling parameters cannot exceed 15 at most. The ADC module has 16 sampling channels, the MCU is controlled to be a chip with the main frequency of 48M of FM0+ series of Seplacian, and the chip is relatively low in cost.
Step S102, configuring the sampling time CT1 and CT2 of the current sampling channel according to the running data of the system time base; in this step, the sampling time of the current sampling channel is set according to the system running time base, and the sampling time of the system sampling channel is fixedly set to be 0 point of the counting time base. In addition, the time base of the current sampling channel is the same as the time base of the combination of the high level and the low level of the 6-path PWM output, the sampling time of the current sampling channel corresponds to the effective vector time T1 and T2 matched by the 6-path PWM, the corresponding calculation formula of the effective vector time T1 and T2 matched by the sampling time CT1 and CT2 of the current sampling channel and the 6-path PWM is CT1 ═ T0+ T1)/2, CT2 ═ T1+ (T0+ T2)/2, T0 is a zero vector value after symmetric PWM modulation, and T1 and T2 are effective vectors respectively; the 6-path PWM refers to 6-path PWM in a control chip.
Step S103, opening a current sampling channel, finishing current sampling at the moments of CT1 and CT2, closing the current sampling channel, and opening a system sampling channel; in the step, firstly, the current data with high real-time requirement is sampled according to the time sequence requirement, the current sampling channel is closed at the sampling time CT1 after the current channel is sampled at the sampling time CT2, and the system sampling channel is opened at the same time; as described above, the sampling at the time points CT1 and CT2 is also performed at different time points, so that the influence of the current sampling with high real-time requirement on the system resource is reduced, and the faster the current sampling speed is, the lower the influence on the voltage utilization rate is.
Step S104, completing system sampling and closing a system sampling channel; in this step, closing the system sampling channel indicates that sampling for one sampling period has been completed. In addition, in the invention, the system sampling channel is closed, and the current sampling channel is opened under the control of the control register SARADC _ REG of the ADC module, and the register has time delay after operation, and the hardware unit can respond to the configuration action of the register, and the time delay is ensured to be realized by controlling the time sequence.
S105, transmitting the current data and the system data obtained by sampling to an FOC motor control operation unit and a system control function module, and circulating the steps S103-S105; in this step, the sampled current data and system data are transmitted to an FOC (directional vector control) motor control arithmetic unit and a system control function module, i.e., sampling and data processing of one sampling period are completed, and the current and system can be sampled repeatedly in the recycling steps S103 to S105, and the specific number of times of repetition is determined according to actual use requirements. In addition, in the step, the acquired data (current data and system data) are judged, if the acquired data are different from the set parameter threshold, a fault is reported, and a fault operation code is given; specifically, if the acquired data is greater than or less than the set parameter threshold, a fault is reported, because each sampled data has a corresponding threshold, it is ensured that the data transmitted to the next operation unit is correct data, if data is not in the set data range, fault processing is executed according to the type of the data, and a fault operation code is given to prompt that the sampling is abnormal.
Furthermore, in step S105, the compressor phase currents sampled at the sampling times CT1 and CT2 are transmitted to the Clarke transformation module of the motor control algorithm unit FOC to generate the input data required by the Park transformation module; the Clarke transformation module realizes transformation of a coordinate system by using a current input parameter so as to generate input data required by the Park module; and the Clarke module and the Park conversion module belong to modules of a FOC control algorithm of the motor. In addition, as a preferred embodiment of the present invention, the sampled dc bus voltage data is transmitted to the motor control FOC module, the PFC current and the PFC ac voltage are transmitted to the PFC control module together, and the sampled outdoor environment, compressor coil dimension and compressor discharge temperature are transmitted to the system operation module of the inverter air conditioner, so as to implement target frequency control, control of the electronic expansion valve, system protection control, and the like.
The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.
Claims (10)
1. A sampling method of an air conditioner permanent magnet synchronous motor is characterized by comprising the following steps:
a. respectively configuring current sampling and system sampling to a sampling channel of an ADC module according to the real-time requirement of sampling data;
b. according to the running data of the system time base, the sampling time CT1 and CT2 of the current sampling channel are configured;
c. opening a current sampling channel, finishing current sampling at the moments of CT1 and CT2, closing the current sampling channel, and opening a system sampling channel;
d. completing system sampling, and closing a system sampling channel;
e. and c, transmitting the current data and the system data obtained by sampling to an FOC motor control operation unit and a system control function module, and circulating the steps c-e.
2. The sampling method of an air conditioner permanent magnet synchronous motor according to claim 1, wherein the system sampling includes sampling of 15 system parameters at most.
3. The sampling method of the air conditioner permanent magnet synchronous motor according to claim 2, wherein the system sampling comprises sampling of 6 parameters, bus voltage, outdoor environmental conditions, compressor coil dimensions, compressor discharge temperature, PFC current, and PFC ac voltage.
4. The sampling method of the air conditioner permanent magnet synchronous motor according to claim 3, wherein the sampling time of the current sampling channel is set according to a system running time base, and the sampling time of the system sampling channel is fixedly set to 0 point of a counting time base.
5. The sampling method of the air conditioner permanent magnet synchronous motor as claimed in claim 4, wherein the time base of the current sampling channel is the same as the time base of the combination of the high and low levels of the 6 PWM outputs, and the sampling time of the current sampling channel corresponds to the valid vector time T1 and T2 matched by the 6 PWM outputs.
6. The sampling method of the air conditioner permanent magnet synchronous motor according to claim 1, wherein the current sampling specifically refers to a phase current value of the permanent magnet synchronous motor operation obtained through a differential circuit of a sampling resistor and an operational amplifier.
7. The sampling method of the air conditioner permanent magnet synchronous motor according to claim 1, wherein in the step e, the obtained data is determined, and if the obtained data is different from the set parameter threshold, a fault is reported and a fault operation code is given.
8. The sampling method of the air conditioner permanent magnet synchronous motor according to claim 1, wherein in the step e, the permanent magnet synchronous motor phase currents sampled at the sampling time CT1, CT2 are transmitted to a Clarke transformation module of a motor control algorithm unit FOC to generate the input data required by the Park transformation module.
9. The sampling method of the air conditioner permanent magnet synchronous motor according to claim 3, wherein the voltage data of the sampled direct current bus is transmitted to a motor control FOC module, the PFC current and the PFC alternating current voltage are transmitted to the PFC control module together, and the outdoor environment condition, the compressor coil pipe dimension and the compressor exhaust temperature obtained by sampling are transmitted to a system operation module of the variable frequency air conditioner.
10. The sampling method of the air conditioner permanent magnet synchronous motor according to claim 1, wherein in the step d, the system sampling channel is closed, and the current sampling channel is opened, which are both controlled by a control register sar ADC _ REG of the ADC module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010282322.5A CN111464093A (en) | 2020-04-11 | 2020-04-11 | Sampling method of air conditioner permanent magnet synchronous motor |
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| CN202010282322.5A CN111464093A (en) | 2020-04-11 | 2020-04-11 | Sampling method of air conditioner permanent magnet synchronous motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726658A (en) * | 2010-01-12 | 2010-06-09 | 河源市雅达电子有限公司 | Single-channel time-sharing multiplexing sampling method and sampling circuit thereof |
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| CN105450095A (en) * | 2015-12-16 | 2016-03-30 | 四川长虹电器股份有限公司 | Single-resistor current sampling method and air conditioning device |
| CN105450094A (en) * | 2015-12-16 | 2016-03-30 | 四川长虹电器股份有限公司 | Current sampling method and air conditioning device |
| CN106936436A (en) * | 2017-04-14 | 2017-07-07 | 湖南利能科技股份有限公司 | The multi channel signals sampling system and method for a kind of time sharing sampling |
| CN207352065U (en) * | 2017-07-25 | 2018-05-11 | 九阳股份有限公司 | A kind of signal deteching circuit and food processor for food processor |
| CN207427006U (en) * | 2017-10-30 | 2018-05-29 | 广东美的制冷设备有限公司 | Electric machine control system, transducer air conditioning |
| CN207924449U (en) * | 2018-03-29 | 2018-09-28 | 厦门芯阳科技股份有限公司 | A kind of circuit of multiple one AD input terminal of analog quantity time-sharing multiplex |
| CN109004869A (en) * | 2017-12-25 | 2018-12-14 | 苏州工业园区艾思科技有限公司 | A kind of no belt current operational amplifier FOC electric machine control system and method |
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2020
- 2020-04-11 CN CN202010282322.5A patent/CN111464093A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726658A (en) * | 2010-01-12 | 2010-06-09 | 河源市雅达电子有限公司 | Single-channel time-sharing multiplexing sampling method and sampling circuit thereof |
| CN102122915A (en) * | 2011-04-08 | 2011-07-13 | 中国科学院微电子研究所 | Device for closed-loop control of permanent magnet synchronous motor |
| CN104698923A (en) * | 2015-02-05 | 2015-06-10 | 青岛四方车辆研究所有限公司 | Motor train unit auxiliary control system |
| CN105450095A (en) * | 2015-12-16 | 2016-03-30 | 四川长虹电器股份有限公司 | Single-resistor current sampling method and air conditioning device |
| CN105450094A (en) * | 2015-12-16 | 2016-03-30 | 四川长虹电器股份有限公司 | Current sampling method and air conditioning device |
| CN106936436A (en) * | 2017-04-14 | 2017-07-07 | 湖南利能科技股份有限公司 | The multi channel signals sampling system and method for a kind of time sharing sampling |
| CN207352065U (en) * | 2017-07-25 | 2018-05-11 | 九阳股份有限公司 | A kind of signal deteching circuit and food processor for food processor |
| CN207427006U (en) * | 2017-10-30 | 2018-05-29 | 广东美的制冷设备有限公司 | Electric machine control system, transducer air conditioning |
| CN109004869A (en) * | 2017-12-25 | 2018-12-14 | 苏州工业园区艾思科技有限公司 | A kind of no belt current operational amplifier FOC electric machine control system and method |
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